JP2008249315A - Glow plug with sensor and glow plug with sensor connecting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a glow plug with a sensor capable of reducing contact resistance in a contact part, by largely earning the contact area between a plug heater terminal part electrically connected to a heater part and an external heater terminal part of an external connector. <P>SOLUTION: This glow plug 100 with the sensor has a plug heater terminal 145 in a connector connecting body 140. This plug heater terminal 145 is arranged outside in the radial direction of the axis AX of the connector connecting body 140 more than first-third plug sensor terminals 148, 151 and 153, and is formed in a form capable of being brought into pressure contact over the whole periphery in the peripheral direction of the axis AX with an external heater terminal 181. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a glow plug with a sensor that can be used as a starting assist device for an internal combustion engine such as a diesel engine and can detect a state of a combustion chamber of the internal combustion engine, and a glow plug with a sensor to which an external connector is connected, and The present invention also relates to a glow plug connection structure with a sensor in which an external connector is connected to such a glow plug with a sensor.

  2. Description of the Related Art Conventionally, a glow plug with a sensor in which a sensor function for detecting a state of a combustion chamber such as a combustion pressure and a combustion temperature is added to a glow plug for assisting start of an internal combustion engine such as a diesel engine. Among such glow plugs with sensors, there are some which are electrically connected to the outside such as an ECU by attaching an external connector. For example, Patent Document 1 discloses a glow plug with a sensor in which such an external connector is connected.

  The glow plug with a sensor of Patent Document 1 has a structure in which a connector casing (connector connection portion) is connected to the base end side of the glow plug main body (see the claims of FIGS. reference). In order to electrically connect the glow plug with a sensor to the outside such as an ECU, an appropriate connector or a joint (external connector) is attached to the connector / casing (connector connecting portion).

  The connector / casing (connector connection portion) of Patent Document 1 is a large current connection portion of a heater (heater portion) of a glow plug with a sensor in any of the forms shown in FIGS. A large current connection portion (plug heater terminal portion) electrically connected to the casing is disposed in the center of the casing so as to be separated from the casing. In addition, the multiple sensor contacts (plug sensor terminal part) connected to the sensor connection part of the sensor part of the glow plug with sensor are insulated from the high current connection part (plug heater terminal part) and connected to the high current. It is provided on the radially outer side of the part (plug heater terminal part).

JP 2005-207730 A

  However, in the glow plug with a sensor disclosed in Patent Document 1, a large current connection portion (plug heater terminal portion) for supplying a large current to the heater (heater portion) is provided inside the connector casing (connector connection portion). Since it is provided in the center, the contact area with the terminal (external heater terminal portion) when the compatible connector or the joint (external connector) is worn tends to be small. For this reason, since the contact resistance at the contact portion between the large current connection portion (plug heater terminal portion) and the terminal (external heater terminal portion) of the compatible connector or joint (external connector) increases, the resistance value of the heater portion is particularly large. In a glow plug using a low heater material, there is a concern that the temperature control of the heater part may be adversely affected.

  The present invention has been made in view of the current situation, and can greatly increase the contact area between the plug heater terminal portion electrically connected to the heater portion and the external heater terminal portion of the external connector. It is an object of the present invention to provide a glow plug with a sensor capable of reducing contact resistance at a portion, and a glow plug connection structure with a sensor formed by connecting an external connector to such a glow plug with a sensor.

  The means for solving the problem is a heater part that is heated by energization, a sensor part that can detect the state in the combustion chamber of the internal combustion engine, and a connector connection part to which an external connector is connected, and is electrically connected to the heater part. And a plug heater terminal portion configured to be electrically connectable to an external heater terminal portion disposed on the external connector, and electrically connected to the sensor portion and disposed on the external connector. A glow plug with a sensor having a plug sensor terminal portion configured to be electrically connectable to the external sensor terminal portion, wherein the plug heater terminal portion includes the plug sensor terminal. Is arranged on the outer side of the connector connecting portion in the radial direction of the axis, and can be press-contacted with the external heater terminal at a plurality of locations in the circumferential direction of the axis. That is a glow plug with a sensor.

Since a large current flows through the heater part of the glow plug with sensor when it is used, if the contact resistance between the plug heater terminal part of the connector connection part and the external heater terminal part of the external connector attached to the glow plug with sensor is large As described above, the temperature control of the heater part may be adversely affected.
On the other hand, in the glow plug of the present invention, the plug heater terminal portion is disposed radially outside the plug sensor terminal portion, and the plug heater terminal portion is arranged at a plurality of locations in the circumferential direction with the external heater terminal portion of the external connector. It is a form that can be pressed with. For this reason, since the dimension of a plug heater terminal part can be enlarged, when attaching an external connector, a contact area with an external heater terminal part can be greatly earned, and the contact resistance in this contact part can be made small. Therefore, even if the heater portion is configured using a heater material having a low resistance value, the temperature control of the heater portion can be reliably performed.

In particular, the plug heater terminal portion is preferably formed in a form that can be press-contacted with the external heater terminal portion over the entire circumference in the circumferential direction of the axis, such as a ring shape. By doing so, the contact area between the plug heater terminal portion and the external heater terminal portion can be further increased, so that the contact resistance at this contact portion can be further reduced, and the temperature control of the heater portion can be more reliably performed. Can do.
As the “glow plug with sensor”, a glow plug with a combustion pressure detection sensor capable of detecting the combustion pressure in the combustion chamber of the internal combustion engine, a glow plug with a temperature detection sensor capable of detecting the combustion temperature in the combustion chamber, Examples include a puller plug with an ion current sensor that can detect the combustion state in the combustion chamber.

  Further, in the above glow plug with sensor, the plug heater terminal portion may be a glow plug with sensor which faces the outside in the radial direction of the axis.

  According to the present invention, since the plug heater terminal portion faces the radially outer side, for example, the connector connecting portion has a cylindrical shape and the plug heater terminal portion faces the radially inner side. Thus, the size of the plug heater terminal can be increased. Thereby, the contact area between the plug heater terminal portion and the external heater terminal portion can be further increased, and the contact resistance at this contact portion can be further reduced. Therefore, the temperature control of the heater part can be performed more reliably.

  Further, in the glow plug with a sensor, the connector connecting portion may be a cylindrical shape, and the plug heater terminal portion may be a glow plug with a sensor facing radially inward of the axis.

  According to the present invention, the plug heater terminal portion faces radially inward. For this reason, compared with the case where the plug heater terminal portion is configured to face radially outward, a seal portion for preventing water from entering the plug heater terminal portion is provided on the outer periphery or the tip of the connector connector. It can be provided relatively freely. Therefore, it is easy to prevent water from entering the plug heater terminal.

  Furthermore, in any of the above-described glow plugs with a sensor, the connector connecting portion may be a glow plug with a sensor having a plug locking portion configured to be able to latch the external connector.

  According to the present invention, since the connector connecting portion has the plug locking portion configured to lock the external connector, the external connector can be securely fixed when the external connector is attached to the glow plug with sensor. For this reason, the electrical connection reliability of a plug heater terminal part and an external heater terminal part and the electrical connection reliability of a plug sensor terminal part and an external sensor terminal part can be improved.

  Further, in the glow plug with a sensor, the plug heater terminal portion may be a glow plug with a sensor that also serves as the plug locking portion.

  According to the present invention, since the plug heater terminal portion also serves as the plug locking portion, the external connector can be securely fixed by the plug heater terminal portion, and mechanical stress generated by the locking can be used. Thus, the plug heater terminal and the external heater terminal can be more reliably brought into contact with each other. Therefore, the electrical connection reliability between the plug heater terminal portion and the external heater terminal portion can be further improved.

  Furthermore, in any of the above-described glow plugs with a sensor, the plug sensor terminal portion may be a glow plug with a sensor that faces the outside in the radial direction of the axis.

  According to the present invention, since the plug sensor terminal portion faces radially outward, for example, the connector connecting portion has a cylindrical shape and the plug sensor terminal portion faces radially inward. Thus, the dimensions of the plug sensor terminal can be increased. Therefore, a large contact area with the external sensor terminal portion of the external connector can be obtained, and electrical connection reliability at the contact portion can be improved.

  Furthermore, it is preferable that the glow plug with a sensor has a plurality of plug sensor terminal portions, and the plurality of plug sensor terminal portions are glow plugs with a sensor arranged side by side in the axial direction.

  According to the present invention, since the plurality of plug sensor terminal portions are arranged side by side in the axial direction, for example, compared to the case where the plurality of plug sensor terminal portions are arranged side by side in the circumferential direction, etc. The size of the connector connecting portion, particularly the radial direction can be greatly reduced.

  Furthermore, in the glow plug with a sensor, the connector connecting portion has a plurality of plug outer peripheral stepped portions whose outer peripheral shapes are stepped, and the plurality of plug sensor terminal portions include a plurality of plug sensor terminal portions. A glow plug with a sensor, which is arranged one by one on the outer peripheral surface of the plug outer peripheral stepped portion, is preferable.

  According to the present invention, since the plurality of plug sensor terminal portions are arranged one by one on the outer peripheral surface of the plurality of plug outer peripheral stepped portions having a stepped shape, the external connector is attached to the glow plug with sensor. In this case, it is possible to reliably prevent the plug sensor terminal portion and the external sensor terminal portion of the external connector not corresponding to this from being erroneously connected.

  Furthermore, the glow plug with a sensor according to any one of the above, wherein the connector connecting portion has a cylindrical shape, and the plug sensor terminal portion faces radially inward of the axis. And good.

  According to the present invention, the plug sensor terminal portion faces radially inward. For this reason, compared with the case where the plug sensor terminal portion is configured to face radially outward, a seal portion for preventing water from entering the plug sensor terminal portion is provided on the outer periphery or the tip of the connector connector. It can be provided relatively freely. Therefore, it is easy to prevent water from entering the plug sensor terminal portion.

  Furthermore, it is preferable that the glow plug with a sensor has a plurality of plug sensor terminal portions, and the plurality of plug sensor terminal portions are glow plugs with a sensor arranged side by side in the axial direction.

  According to the present invention, since the plurality of plug sensor terminal portions are arranged side by side in the axial direction, for example, compared to the case where the plurality of plug sensor terminal portions are arranged side by side in the circumferential direction, etc. The size of the connector connecting portion, particularly the radial direction can be greatly reduced.

  Furthermore, in the glow plug with sensor, the connector connecting portion is configured to have a plurality of plug inner peripheral stepped portions whose inner peripheral shape is stepped, and the plurality of plug sensor terminal portions are: It is preferable that the glow plugs with sensors are arranged one by one on the inner peripheral surface of the plurality of plug inner peripheral stepped portions.

  According to the present invention, since the plurality of plug sensor terminal portions are arranged one by one on the inner peripheral surface of the plurality of plug inner peripheral stepped portions having a stepped shape, the external connector is connected to the glow plug with sensor. When it is attached to the plug sensor terminal, it is possible to prevent the plug sensor terminal part and the external sensor terminal part of the external connector not corresponding thereto from being erroneously connected.

  Furthermore, the glow plug with a sensor according to any one of the above, wherein the plug sensor terminal portion is configured to be press-contacted with the external sensor terminal portion at a plurality of locations in a circumferential direction of the axis. A plug is good.

  According to the present invention, the contact area between the plug sensor terminal portion and the external sensor terminal portion of the external connector is configured such that the plug sensor terminal portion can be pressed into contact with the external sensor terminal portion at a plurality of locations in the circumferential direction of the axis. Can earn a lot. Thereby, the electrical connection reliability of a plug sensor terminal part and an external sensor terminal part can further be improved.

  Furthermore, in the glow plug with a sensor according to any one of the above, when the external connector is connected, the plug sensor terminal unit and the plug sensor terminal unit are interposed between the external connector and the connector connection unit. A plug seal member configured to prevent water from entering the external sensor terminal portion, the sensor including a plug seal member disposed radially inward of the axis relative to the plug heater terminal portion It is good to use a glow plug with.

In order to prevent water from entering the plug sensor terminal portion and the external sensor terminal portion, when the plug seal member is disposed radially outside the plug heater terminal portion, the plug seal member is disposed outside the plug heater terminal portion. The dimension in the radial direction of the connector connecting portion is increased by the amount provided in the above. In addition, since the heater portion has a low resistance, even if water contacts the plug heater terminal connected to the heater portion, current does not easily leak from the plug heater terminal, so the waterproof measures for the plug heater terminal are not so important. On the other hand, the plug sensor terminal portion is short-circuited when it comes into contact with water, and the sensor portion connected to the plug sensor terminal portion may be destroyed.
Therefore, in the present invention, the plug seal member capable of preventing water from entering the plug sensor terminal portion and the external sensor terminal portion is disposed radially inward from the plug heater terminal portion. Therefore, the plug sensor member can reliably waterproof the external sensor terminal portion and the plug sensor terminal portion that require waterproofing, and can reduce the radial dimension of the connector connecting portion.

  Furthermore, in any of the above-described glow plugs with a sensor, the connector connecting portion may be a glow plug with a sensor formed by resin insert molding.

  According to the present invention, the connector connecting portion is formed by resin insert molding. Such a connector connection portion can easily insulate the plug heater terminal portion and the plug sensor terminal portion from each other, and can be easily manufactured, so that it can be made inexpensive. Therefore, the glow plug with sensor can be made inexpensive.

  Another solution is a glow plug connection structure with a sensor in which an external connector is connected to a glow plug with a sensor, and an external connector provided with an external heater terminal portion and an external sensor terminal portion is energized. A glow plug with a sensor having a heater section for raising the temperature and a sensor section capable of detecting the state of the combustion chamber of the internal combustion engine, the connector connecting section connected to the external connector, and electrically connected to the heater section And a plug heater terminal portion electrically connected to the external heater terminal portion of the external connector, and electrically connected to the sensor portion, and to the external sensor terminal portion of the external connector A connector connecting portion having a plug sensor terminal portion electrically connected, and the plug heater terminal portion is connected to the plug sensor terminal portion. And a glow plug with a sensor, which is disposed outside the connector connecting portion in the radial direction of the axis, and has a glow plug with a sensor formed in pressure contact with the external heater terminal at a plurality of locations in the circumferential direction of the axis. It is a plug connection structure.

  In the glow plug connection structure with a sensor of the present invention, the plug heater terminal portion is disposed radially outside of the plug sensor terminal portion, and the plug heater terminal portion includes a plurality of circumferentially extending external heater terminal portions of the external connector. It is pressed in place. For this reason, since the dimensions of the plug heater terminal portion and the external heater terminal portion can be increased and the contact area between the plug heater terminal portion and the external heater terminal portion can be greatly increased, the contact resistance at the contact portion can be reduced. Therefore, even if the heater portion is configured using a heater material having a low resistance value, the temperature control of the heater portion can be reliably performed.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a glow plug 100 with a sensor and an external connector 170 according to the first embodiment. FIG. 2 shows a structure in the vicinity of the sensor unit 120 in the glow plug 100 with a sensor. FIG. 3 shows a connector connection body (connector connection portion) 140 constituting the glow plug 100 with a sensor. FIG. 4 shows a connector connector 140 and an external connector 170 that constitute the sensor-equipped glow plug connection structure 190 according to the first embodiment. 1 to 4, the lower side in the drawing is the distal end side in the axis AX direction (hereinafter also referred to simply as the distal end side), and the upper side in the drawing is also referred to as the proximal end side in the axis AX direction (hereinafter simply referred to as the proximal end side). .)

  The glow plug 100 with sensor and the glow plug connection structure 190 with sensor can not only heat the heater member (heater part) 101 by energization but also change the combustion pressure of the internal combustion engine in order to assist in starting the internal combustion engine (not shown). The sensor unit 120 is configured to be detectable. As shown in FIG. 1 or 2, a glow plug 100 with a sensor includes a cylindrical housing 115 extending in the axis AX direction, and a rod-shaped heater energizing rod 119 held inside the housing 115 and extending in the axis AX direction. The heater energizing rod 119 is disposed on the distal end side and has a rod-shaped heater member 101 extending in the direction of the axis AX. The glow plug 100 with a sensor includes a sensor unit 120 configured to be able to detect a change in combustion pressure of the internal combustion engine during use, an enclosing member 130 surrounding the sensor unit 120 and the like, and a base end of the enclosing member 130 And a connector connector 140 to which the external connector 170 is connected.

  Among these, the heater member 101 located on the tip side is made of silicon nitride ceramic, and has a rod-like shape with the tip being hemispherical. The heater member 101 is disposed in a state in which the tip portion 101s protrudes outward from the housing toward the tip side. The heater member 101 has a known configuration. That is, a heater heating portion (not shown) made of a nonmetallic heating element is provided in the tip 101s. On the other hand, on the outer peripheral surface of the base end side, two terminals (not shown) for supplying electric power necessary for the heat generation of the heater heating portion are provided at predetermined positions, respectively, and are electrically connected to both ends of the heater heating portion, respectively. ing.

  The housing 115 includes a cylindrical housing main body 116 and a cylindrical heater holding member 117 which is fixed to the distal end side by welding and holds the heater member 101 on the inside. Among these, the housing main body 116 is formed with a male screw portion 116n for attaching the glow plug 100 with a sensor to a mounting hole of the internal combustion engine at a predetermined position on the base end side. Further, a tool engaging portion 116m for engaging the tool at the time of screwing is formed at a predetermined position on the base end side.

  The heater member 101 is press-fitted inside the heater holding member 117, and the heater holding member 117 and one terminal of the heater member 101 are electrically connected. Further, the proximal end portion of the heater member 101 is fixed to the distal end portion of the heater energizing rod 119 via a connection ring (not shown), and the other terminal of the heater member 101 and the heater energizing rod 119 are electrically connected. Yes. By adopting such a configuration, when the glow plug 100 with a sensor is attached to the internal combustion engine, one terminal of the heater member 101 can be grounded to the internal combustion engine through the housing 115. Then, a current may be supplied to the heater member 101 through the heater energizing rod 119.

  The sensor unit 120 detects the change in the combustion pressure by utilizing the movement of the heater energizing rod 119 in the direction of the axis AX in accordance with the change in the combustion pressure in the combustion chamber (see FIG. 2). The sensor unit 120 has a known configuration including a diaphragm (piezoresistive element) 121, an IC chip 128, and the like. That is, the sensor unit 120 includes a diaphragm 121, a diaphragm cover 123 that covers the diaphragm 121, a wire cover 125 that covers a bonding wire 126 described later, and a flexible substrate 127 on which the IC chip 128 is mounted.

The flexible substrate 127 is bent at two locations in an S shape, and the heater energizing rod 119 is disposed through the flexible substrate 127. The flexible substrate 127 is electrically connected to the diaphragm 121 by three bonding wires 126 at the front end portion 127s (lower side in the figure). In addition, the flexible substrate 127 is electrically connected to the heater energizing rod 119 by soldering at the base end portion 127k (upper side in the drawing) with the distal end portion 119k of the heater energizing rod 119 penetrating therethrough. ing. Further, the flexible substrate 127 has a heater pin 146 and three sensor pins (a first sensor pin 149, a second sensor pin 152, and a third sensor pin 154) protruding from the connector connecting body 140, which will be described later, at the base end portion 127k. By being soldered in a penetrating state, the pins 146, 149, 152, and 154 are electrically connected. Thereby, the heater pin 146 of the connector connector 140 is electrically connected to the heater member 101 via the flexible substrate 127, the heater energizing rod 119, and the like, and the sensor pins 149, 152, and 154 of the connector connector 140 are The sensor unit 120 is electrically connected via the flexible substrate 127.
The surrounding member 130 has a cylindrical shape extending in the direction of the axis AX, is fixed to the housing 115, and surrounds a part of the sensor portion 120 and the connector connector 140 on the front end side.

  The connector connection body 140 is formed by preparing each terminal fitting, holding them in a predetermined arrangement, and performing known resin insert molding. As shown in FIG. 3, the connector connector 140 has a form in which four cylinders having different outer diameters are stacked in the axis AX direction and become smaller in diameter toward the proximal end side. Specifically, the outer peripheral shape of the four plug outer peripheral stepped portions is stepped, that is, from the tip side, the first plug outer peripheral stepped portion 141, the second plug outer peripheral stepped portion 142, and the third plug outer peripheral stepped step. It is set as the form which has the part 143 and the 4th plug outer periphery stepped part 144. FIG.

Of these, the ring-shaped plug heater terminal 145 facing the outer side in the radial direction of the axis AX (hereinafter also simply referred to as the radial direction) is disposed on the outer peripheral surface 141c of the first plug outer peripheral stepped portion 141 having the largest diameter. It is installed. The plug heater terminal 145 is electrically connected to the heater pin 146 protruding from the front end surface 140 s of the connector connecting body 140 to the front end side inside the connector connecting body 140. Therefore, the plug heater terminal 145 is electrically connected to the heater member 101. On the other hand, the plug heater terminal 145 has a circumferential direction between the external heater terminal 181 of the external connector 170 and the axis AX (hereinafter also simply referred to as a circumferential direction) when an external connector 170 described later is attached (see FIG. 4). Are in contact with each other and electrically connected.
In addition, two pin-shaped plug locking portions 147 that can be locked by turning an external connector 170 described later are provided on the outer peripheral surface 141c of the first plug outer peripheral stepped portion 141. These plug engaging portions 147 are provided at predetermined positions symmetrical with respect to the axis AX on the distal end side of the plug heater terminal 145 in the outer peripheral surface 141c, and respectively protrude outward in the radial direction.

On the outer peripheral surface 142c of the second plug outer peripheral stepped portion 142, a ring-shaped first plug sensor terminal 148 facing the radially outer side is disposed. The first plug sensor terminal 148 is electrically connected to the first sensor pin 149 protruding from the front end surface 140 s of the connector connecting body 140 to the front end side in the connector connecting body 140. Therefore, the first plug sensor terminal 148 is electrically connected to the sensor unit 120. On the other hand, the first plug sensor terminal 148 comes into contact with the first external sensor terminal 183 of the external connector 170 over the entire circumference in the circumferential direction when an external connector 170 described later is attached (see FIG. 4). Connected.
Further, a plug seal member 150 made of a ring-shaped rubber is disposed on the distal end side of the outer peripheral surface 142c of the second plug outer peripheral stepped portion 142 with respect to the first plug sensor terminal 148. The plug seal member 150 is in close contact with the external seal member 184 of the external connector 170 over the entire circumference in the circumferential direction when an external connector 170 described later is attached.

  On the outer peripheral surface 143c of the third plug outer peripheral stepped portion 143, a ring-shaped second plug sensor terminal 151 facing the radially outer side is disposed. The second plug sensor terminal 151 is electrically connected to the second sensor pin 152 protruding from the distal end surface 140 s of the connector connecting body 140 toward the distal end side in the connector connecting body 140. Therefore, the second plug sensor terminal 151 is electrically connected to the sensor unit 120. On the other hand, the second plug sensor terminal 151 is in contact with the second external sensor terminal 185 of the external connector 170 over the entire circumference in the circumferential direction when an external connector 170 described later is attached (see FIG. 4). Connected.

On the outer peripheral surface 144c of the fourth plug outer peripheral stepped portion 144, a ring-shaped third plug sensor terminal 153 facing the radially outer side is disposed. The third plan sensor terminal 153 is electrically connected to the third sensor pin 154 protruding from the distal end surface 140 s of the connector connecting body 140 toward the distal end side in the connector connecting body 140. Therefore, the third plug sensor terminal 153 is electrically connected to the sensor unit 120. On the other hand, the third plug sensor terminal 153 comes into contact with the third external sensor terminal 187 of the external connector 170 over the entire circumference in the circumferential direction when an external connector 170 described later is attached (see FIG. 4). Connected.
In addition, this glow plug 100 with a sensor can prepare each member and can be assembled by a well-known method.

Next, the external connector 170 connected to the glow plug with sensor will be described. As shown in FIG. 1, the external connector 170 has a cylindrical shape, a connector main body 171 connected to the connector connector 140 of the glow plug 100 with a sensor, and a base end 171 k of the connector main body 171 to a connector. The lead encircling portion 172 extends in a direction orthogonal to the main body portion 171 and includes a lead encircling portion 172 into which a lead wire (not shown) is inserted.
As shown in FIG. 4, the inner side of the connector main body 171 has a form in which holes with different inner diameters overlap in the axis AX direction and become smaller in diameter toward the proximal end side. Specifically, four inner circumferential stepped portions in a staircase shape, that is, from the front end side, a first outer inner circumferential stepped portion 175, a second outer inner circumferential stepped portion 176, and a third outer inner circumferential stepped portion. 177 and a fourth external inner peripheral stepped portion 178 are formed.

Among these, a ring-shaped external heater terminal 181 is disposed on the inner peripheral surface 175c of the first outer inner stepped portion 175, and is electrically connected to a lead wire (not shown) inserted into the lead surrounding portion 172. ing. The external heater terminal 181 is bent inward at the tip side over the entire circumference in the circumferential direction so that the cross section is substantially J-shaped, and the plug of the connector connector 140 is biased by the urging force of the bent portion. The heater terminal 145 is pressed and electrically connected over the entire circumference.
Further, the first outer inner stepped portion 175 is provided with an external lock that engages with the two plug locking portions 147 of the connector connector 140 when the external connector 170 is locked to the glow plug 100 with a sensor. The part 182 is provided in two places. These external engagement portions 182 are provided at predetermined positions symmetrical to the axis AX on the distal end side of the external heater terminal 181 in the first external inner peripheral stepped portion 175.

A ring-shaped first external sensor terminal 183 is disposed on the inner peripheral surface 176c of the second outer inner stepped portion 176, and is electrically connected to a lead wire (not shown) inserted into the lead surrounding portion 172. Yes. The first external sensor terminal 183 is bent inward at the distal end over the entire circumference in the circumferential direction so that the cross section is substantially J-shaped, and the connector connector 140 is biased by the biasing force of the bent portion. The first plug sensor terminal 148 is electrically connected by pressure contact over the entire circumference.
In addition, an outer seal member 184 made of ring-shaped rubber is disposed on the inner peripheral surface 176c of the second outer inner stepped portion 176 on the tip side of the first outer sensor terminal 183. The external seal member 184 is in close contact with the plug seal member 150 of the connector connector 140 over the entire circumference.

  A ring-shaped second external sensor terminal 185 is disposed on the outer peripheral surface 177c of the third outer inner stepped portion 177, and is electrically connected to a lead wire (not shown) inserted into the lead surrounding portion 172. . The second external sensor terminal 185 is bent inward at the distal end over the entire circumference in the circumferential direction so that the cross section is substantially J-shaped, and the connector connecting body 140 is biased by the urging force of the bent portion. The second plug sensor terminal 151 is electrically connected in pressure contact with the entire circumference in the circumferential direction.

  A ring-shaped third external sensor terminal 187 is disposed on the outer peripheral surface 178c of the fourth outer inner stepped portion 178, and is electrically connected to a lead wire (not shown) inserted into the lead surrounding portion 172. . The third external sensor terminal 187 is bent inward at the distal end over the entire circumference in the circumferential direction so that the cross section is substantially J-shaped, and the connector connector 140 is biased by the urging force of the bent portion. The third plug sensor terminal 153 is in pressure contact with and electrically connected to the entire circumference.

  Next, a glow plug connection structure 190 with a sensor that is formed by attaching the external connector 170 to the glow plug 100 with a sensor from the base end side will be described with reference to FIG. In this glow plug connection structure 190 with sensor, the external connector 170 covers the connector connection body 140, and the plug locking portion 147 and the external locking portion 182 engage with each other, whereby the external connector 170 is connected to the glow plug 100 with sensor. It is fixed to.

  Then, the plug heater terminal 145 of the connector connector 140 and the external heater terminal 181 of the external connector 170 are electrically connected in pressure contact over the entire circumference in the circumferential direction. Further, the first to third plug sensor terminals 148, 151, and 153 of the connector connector 140 and the first to third external sensor terminals 183, 185, and 187 of the external connector 170 respectively extend over the entire circumference. It is pressed and electrically connected. Further, the plug seal member 150 of the connector connector 140 and the external seal member 184 of the external connector 170 are in close contact with each other in the circumferential direction, and the first to third plug sensors are located on the base end side from these. The terminals 148, 151, 153 and the first to third external sensor terminals 183, 185, 187 are sealed.

  As described above, in the first embodiment, the plug heater terminal 145 is disposed on the outer peripheral surface 141c of the first plug outer stepped portion 141 having the largest diameter, and the first to third plug sensor terminals 148 and 151 are disposed. , 153 are disposed on the outer peripheral surfaces 142c, 143c, 144c of the second to fourth plug outer peripheral stepped portions 142, 143, 144 having a smaller diameter, respectively. As described above, by disposing the plug heater terminal 145 radially outside the plug sensor terminals 148, 151, and 153, the size of the plug heater terminal 145 can be increased. The plug heater terminal 145 has a ring shape, and is in pressure contact with the external heater terminal 181 of the external connector 170 over the entire circumference. For this reason, the contact area between the plug heater terminal 145 and the external heater terminal 181 can be greatly increased. In particular, since the plug heater terminal portion 145 is disposed on the outer peripheral surface 141c of the first plug outer peripheral stepped portion 141 and faces the radially outer side, the plug heater terminal 145 and the external heater terminal 181 of the external connector 170 are connected to each other. The contact area can be made particularly large. Therefore, since the contact resistance at the contact portion can be reduced, the temperature control of the heater member 101 can be reliably performed during use.

  Further, the first to third plug sensor terminals 148, 151, and 153 can be press-contacted with the first to third external sensor terminals 183, 185, and 187 along the entire circumference in the circumferential direction. The contact area between the third plug sensor terminals 148, 151, and 153 and the first to third external sensor terminals 183, 185, and 187 can be greatly increased. In particular, the first to third plug sensor terminals 148, 151, and 153 are disposed on the outer peripheral surfaces 142c, 143c, and 144c of the second to fourth plug outer peripheral stepped portions 142, 143, and 144, respectively, and radially outward. Therefore, the contact area between the first to third plug sensor terminals 148, 151, 153 and the first to third external sensor terminals 183, 185, 187 of the external connector 170 can be greatly increased. Therefore, the electrical connection reliability between the first to third plug sensor terminals 148, 151, and 153 and the first to third external sensor terminals 183, 185, and 187 can be improved.

  Furthermore, since the connector connector 140 includes the plug locking portion 147 configured to be able to latch the external connector 170, the external connector 170 can be securely fixed. Therefore, the electrical connection reliability between the plug heater terminal 145 and the external heater terminal 181, and the first to third plug sensor terminals 148, 151, 153 and the first to third external sensor terminals 183, 185, 187 The electrical connection reliability can be further improved.

Further, since the first to third plug sensor terminals 148, 151, and 153 are arranged side by side in the axis AX direction, for example, compared to the case where these are arranged side by side in the circumferential direction, the connector The dimension of the connection body 140, particularly the dimension in the radial direction, can be greatly reduced.
The first to third plug sensor terminals 148, 151, and 153 are arranged one by one on the outer peripheral surfaces 142c, 143c, and 144c of the second to fourth plug outer peripheral stepped portions 142, 143, and 144, respectively. Therefore, when the external connector 170 is attached, the first to third plug sensor terminals 148, 151, 153 and the first to third external sensor terminals 183, 185, 187 not corresponding thereto are erroneously connected (for example, The first plug sensor terminal 148 and the second external sensor terminal 185 are erroneously connected).

Further, since the plug seal member 150 is disposed radially inward of the plug heater terminal 145, the first to third plug sensor terminals 148, 151, 153 and the first plug sensor terminals 148, 151, 153, and the first that need to be waterproofed by the plug seal member 150. It is possible to prevent water from entering the third external sensor terminals 183, 185, 187 and to reduce the size of the connector connector 140 in the radial direction.
Further, since the connector connector 140 is formed by resin insert molding, the plug heater terminal 145 and the first to third plug sensor terminal portions 148, 151, 153 can be easily insulated from each other and can be easily manufactured. Since it can, it can be made cheap. Therefore, the glow plug 100 with a sensor can be made inexpensive.

(Embodiment 2)
Next, a second embodiment will be described. Note that the description of the same parts as those in the first embodiment is omitted or simplified. FIG. 5 shows a connector connection body (connector connection portion) 240 constituting the glow plug 200 with a sensor according to the second embodiment. FIG. 6 shows a connector connector 240 and an external connector 270 that constitute a glow plug connection structure 290 with a sensor according to the second embodiment. The glow plug 200 with sensor and the glow plug connection structure 290 with sensor according to the second embodiment are different from the connector connection body 140 and the external connector 170 in the first embodiment with respect to the connector connection body 240 and the external connector 270. Other than that, the second embodiment is the same as the first embodiment.

  First, the connector connector 240 will be described. The connector connector 240 is also formed by resin insert molding. The connector connecting body 240 has a configuration in which three cylinders having different outer diameters are stacked in the direction of the axis AX and become smaller in diameter toward the proximal end side. A first plug outer stepped portion 241, a second plug outer stepped portion 242 and a third plug outer stepped portion 243 are formed. In addition, a bottomed hole 244 extending toward the distal end is formed in the center of the base end surface 240k of the connector connector 240.

  Among these, a ring-shaped plug heater terminal 245 facing radially outward is disposed on the outer peripheral surface 241c of the first plug outer peripheral stepped portion 241 having the largest diameter. The plug heater terminal portion 245 is electrically connected to the heater pin 246 protruding from the distal end surface 240 s of the connector connector 240 to the distal end side inside the connector connector 240. The plug heater terminal 245 is in contact with and electrically connected to an external heater terminal 281 of an external connector 270 described later over the entire circumference (see FIG. 6). Also, two plug locking portions 247 are provided on the outer peripheral surface 241c of the first outer stepped portion 241 as in the first embodiment.

  A ring-shaped first plug sensor terminal 248 facing radially outward is disposed on the outer peripheral surface 242c of the second plug outer peripheral stepped portion 242. The first plug sensor terminal 248 is electrically connected to the first sensor pin 249 protruding from the distal end surface 240 s of the connector connecting body 240 toward the distal end side in the connector connecting body 240. The first plug sensor terminal 248 is in contact with and electrically connected to a first external sensor terminal 283 of an external connector 270 described later over the entire circumference. Further, the plug seal member 250 is disposed on the outer peripheral surface 242c of the second outer peripheral stepped portion 242 as in the first embodiment.

  On the outer peripheral surface 243c of the third plug outer peripheral stepped portion 243, a ring-shaped second plug sensor terminal 251 facing radially outward is disposed. The second plug sensor terminal 251 is electrically connected to the second sensor pin 252 protruding from the distal end surface 240 s of the connector connector 240 to the distal end side in the connector connector 240. The second plug sensor terminal 251 is in contact with and electrically connected to a second external sensor terminal 285 of the external connector 270 described later over the entire circumference.

  On the inner peripheral surface 244c of the bottomed hole 244, an elongated cylindrical third plug sensor terminal 253 facing the inside in the radial direction of the axis AX is disposed. The third plug sensor terminal portion 253 is electrically connected to the third sensor pin 254 protruding from the distal end surface 240 s of the connector connecting body 240 to the distal end side within the connector connecting body 240. The third plug sensor terminal 253 is in contact with and electrically connected to a third external sensor terminal 287 of an external connector 270 described later over the entire circumference.

  Next, the external connector 270 will be described (see FIG. 6). The inner side of the external connector 270 has a configuration in which holes with different inner diameters overlap in the axis AX direction and become smaller in diameter toward the proximal end side, and the three inner peripheral stepped portions in a staircase shape, that is, from the distal end side, A first outer inner stepped portion 275, a second outer inner stepped portion 276, and a third outer inner stepped portion 277 are formed. Further, a rod-like third external sensor terminal 287 that protrudes from the center of the base end portion 270k of the external connector 270 toward the distal end side is formed inside the external connector 270.

  Among these, an external heater terminal 281 similar to the external heater terminal 181 of the first embodiment is disposed on the inner peripheral surface 275 c of the first outer inner stepped portion 275. The external heater terminal 281 is also electrically connected to the plug heater terminal 245 of the connector connection body 240 by being pressed over the entire circumference in the circumferential direction by the urging force of the bent portion. The first outer inner stepped portion 275 is provided with two plug locking portions 247 similar to the plug locking portion 147 of the first embodiment.

  A first external sensor terminal 283 similar to the first external sensor terminal 183 of the first embodiment is disposed on the inner peripheral surface 276c of the second outer inner stepped portion 276. The first external sensor terminal 283 is also electrically connected in pressure contact with the first plug sensor terminal 248 of the connector connecting body 240 over the entire circumference by the biasing force of the bent portion. Further, an outer seal member 284 similar to the outer seal member 184 of the first embodiment is disposed on the inner peripheral surface 276c of the second outer inner stepped portion 276.

A second external sensor terminal 285 similar to the second external sensor terminal 185 of the first embodiment is disposed on the outer peripheral surface 277c of the third outer inner stepped portion 277. The second external sensor terminal 285 is also electrically connected to the second plug sensor terminal 251 of the connector connector 240 by being pressed against the entire circumference in the circumferential direction by the urging force of the bent portion.
The rod-shaped third external sensor terminal 287 is inserted into the elongated cylindrical third plug sensor terminal 253 of the connector connector 240, and contacts the third plug sensor terminal 253 over the entire circumference in the circumferential direction to electrically Connected.

  By attaching such an external connector 270 to the glow plug 200 with sensor from the base end side, a glow plug connection structure 290 with sensor is configured. The external connector 270 covers the connector connector 240, and the plug engaging portion 247 and the external engaging portion 282 are engaged with each other, whereby the external connector 270 is fixed to the glow plug 200 with sensor. Then, the plug heater terminal 245 of the connector connector 240 and the external heater terminal 281 of the external connector 270 are electrically connected in pressure contact over the entire circumference in the circumferential direction. Further, the first to third plug sensor terminals 248, 251, and 253 of the connector connector 240 and the first to third external sensor terminals 283, 285, and 287 of the external connector 270 respectively extend over the entire circumference. It is pressed and electrically connected. In addition, the plug seal member 250 of the connector connector 240 and the external seal member 284 of the external connector 270 are in close contact with each other in the circumferential direction, and the first to third plug sensors are located on the base end side from these. The terminals 248, 251, 253 and the first to third external sensor terminals 283, 285, 287 are sealed.

  As described above, also in the second embodiment, the plug heater terminal 245 is disposed on the outer side in the radial direction than any of the plug sensor terminals 248, 251, and 253, so that the size of the plug heater terminal 245 can be increased. . Further, the plug heater terminal 245 has a ring shape and is in pressure contact with the external heater terminal 281 of the external connector 270 over the entire circumference in the circumferential direction. For this reason, the contact area between the plug heater terminal 245 and the external heater terminal 281 can be increased, and the contact resistance at this contact portion can be reduced. Therefore, the temperature control of the heater member 101 can be reliably performed during use.

In the second embodiment, the plug outer peripheral stepped portions 241, 242, and 243 of the connector connecting body 240 are reduced from four to three in the first embodiment, so that the connector connecting body 240 in the axis AX direction is reduced. Dimensions can be reduced. Therefore, the dimension of the glow plug 200 with a sensor in the axis AX direction can be reduced. Accordingly, since the dimension of the external connector 270 in the axis AX direction can be reduced, the dimension of the glow plug connection structure 290 with sensor in the axis AX direction can also be reduced.
In addition, the same parts as those of the first embodiment have the same actions and effects.

(Embodiment 3)
Next, a third embodiment will be described. Note that description of the same parts as those in the first or second embodiment is omitted or simplified. 7 and 8 show a connector connector (connector connector) 340 constituting the glow plug 300 with a sensor of the third embodiment. FIG. 9 shows a connector connector 340 and an external connector 370 constituting the glow plug connection structure 390 with sensor according to the third embodiment. The glow plug 300 with sensor and the glow plug connection structure 390 with sensor of the third embodiment are the same as the connector connection body 340 and the external connector 370 in the connector connection bodies 140 and 240 and the external connector 170 of the first and second embodiments. , 270, and the rest is the same as in the first embodiment.

  First, the connector connector 340 will be described. This connector connector 340 is also formed by resin insert molding. This connector connector 340 has a bottomed cylindrical shape in which three holes with different inner diameters are stacked in the direction of the axis AX and open to the base end surface 340k, and its inner peripheral shape is a stepped shape with three plug inner peripheral stepped portions. That is, the first plug inner circumferential stepped portion 342, the second plug inner circumferential stepped portion 343, and the third plug inner circumferential stepped portion 344 are provided from the tip side. In addition, a concave portion 341 having a semicircular cross section is provided in the circumferential direction at a predetermined position on the front end side outside the connector connector 240.

  On the concave surface 341c of the concave portion 341, a ring-shaped plug heater terminal 345 facing outward in the radial direction is disposed. The plug heater terminal 345 is electrically connected to the heater pin 246 protruding from the distal end surface 240 s of the connector connector 240 to the distal end side inside the connector connector 240. The plug heater terminal 345 has a substantially semicircular cross section following the concave surface 341c of the concave portion 341. The plug heater terminal 345 can be electrically connected to an external heater terminal 381 of an external connector to be described later in contact with the entire circumference in the circumferential direction, and can be engaged with the external heater terminal 381. That is, the plug heater terminal 345 has a function as a plug locking portion for fixing the external connector 370 in addition to a function as a terminal used for electrical connection.

  On the other hand, of the three plug inner peripheral stepped portions 342, 343, and 344, the inner peripheral surface 342c of the first plug inner peripheral stepped portion 342 located on the distal end side is radially inward of the axis AX. A ring-shaped first plug sensor terminal 348 facing the surface is disposed. The first plug sensor terminal 348 is electrically connected to the first sensor pin 349 protruding from the distal end surface 340 s of the connector connecting body 340 toward the distal end side in the connector connecting body 340. The first plug sensor terminal 348 is in contact with and electrically connected to a first external sensor terminal 383 of an external connector 370 described later over the entire circumference.

  On the inner peripheral surface 343c of the second plug inner peripheral stepped portion 343, a ring-shaped second plug sensor terminal 351 facing radially inward is disposed. The second plug sensor terminal 351 is electrically connected to the second sensor pin 352 protruding from the distal end surface 340 s of the connector connecting body 340 to the distal end side in the connector connecting body 340. The second plug sensor terminal 351 is in contact with and electrically connected to a second external sensor terminal 385 of an external connector 370 described later over the entire circumference.

  On the inner peripheral surface 344c of the third plug inner peripheral stepped portion 344, a ring-shaped third plug sensor terminal 353 facing radially inward is disposed. The third plug sensor terminal 353 is electrically connected to the third sensor pin 354 protruding from the distal end surface 340 s of the connector connecting body 340 toward the distal end side in the connector connecting body 340. The third plug sensor terminal 353 is in contact with and electrically connected to a third external sensor terminal 387 of an external connector 370 described later over the entire circumference.

  Next, the external connector 370 will be described (see FIG. 9). The external connector 370 has a cylindrical wall portion 370f that is open in the distal end surface 370s and forms a cylindrical shape. And inside this cylindrical wall part 370f, a cylinder with different outer diameters is overlapped in the axis AX direction and has a form that becomes smaller in diameter toward the tip side, and has three outer peripheral stepped parts in a staircase shape, that is, the tip side Thus, a first external outer peripheral stepped portion 376, a second external outer peripheral stepped portion 377, and a third external outer peripheral stepped portion 378 are formed.

A ring-shaped external heater terminal 381 is disposed at a predetermined position on the tip side of the inner peripheral surface 370fc of the cylindrical wall portion 370f. The external heater terminal 381 has a semicircular cross section, and is electrically connected to the plug heater terminal 345 of the connector connecting body 340 by being in pressure contact with the entire circumference in the circumferential direction, and can be engaged with the plug heater terminal 345. .
Further, a ring-shaped external seal member 384 made of rubber is disposed at a predetermined position inside the base end portion 370 of the external connector 370. The external seal member 384 can be in close contact with the entire base end surface 340k of the connector connector 340.

  A ring-shaped first external sensor terminal 383 is disposed on the outer peripheral surface 376 c of the first outer outer peripheral stepped portion 376. The first external sensor terminal 383 is bent outward on the tip side over the entire circumference in the circumferential direction so that the cross section is substantially J-shaped, and the connector connector 340 is biased by the biasing force of the bent portion. The first plug sensor terminal 348 of the first plug sensor terminal 348 is pressed and electrically connected over the entire circumference.

  A ring-shaped second external sensor terminal 385 is disposed on the outer peripheral surface 377 c of the second outer outer peripheral stepped portion 377. The second external sensor terminal 385 is bent outward on the tip side over the entire circumference in the circumferential direction so that the cross section is substantially J-shaped, and the connector connector 340 is biased by the biasing force of the bent portion. The second plug sensor terminal 351 is electrically connected in pressure contact over the entire circumference in the circumferential direction.

  A ring-shaped third external sensor terminal 387 is disposed on the outer peripheral surface 378c of the third outer outer peripheral stepped portion 378. The third external sensor terminal 387 is bent outward on the tip side over the entire circumference in the circumferential direction so that the cross section is substantially J-shaped, and the connector connector 340 is biased by the biasing force of the bent portion. The third plug sensor terminal 353 is electrically connected in pressure contact over the entire circumference.

  By attaching such an external connector 370 to the glow plug 300 with a sensor from the base end side, a glow plug connection structure 390 with a sensor is configured. The external connector 370 covers the connector connecting portion 340, and the plug heater terminal 345 and the external heater terminal 381 are engaged with each other, whereby the external connector 370 is fixed to the glow plug 300 with sensor. The plug heater terminal 345 of the connector connector 340 and the external heater terminal 381 of the external connector 370 are electrically connected in pressure contact over the entire circumference. Further, the first to third plug sensor terminals 348, 351, and 353 of the connector connector 340 and the first to third external sensor terminals 383, 385, and 387 of the external connector 370 respectively extend over the entire circumference. It is pressed and electrically connected. In addition, the external seal member 384 of the external connector 370 is in close contact with the entire base end surface 340k of the connector connector 340, and the first to third plug sensor terminals 348, 351, 353, and The first to third external sensor terminals 383, 385, and 387 are sealed.

  As described above, also in the third embodiment, the plug heater terminal 345 is disposed on the radially outer side than any of the plug sensor terminals 348, 351, 353, so that the size of the plug heater terminal 345 can be increased. . The plug heater terminal 345 has a ring shape, and is in pressure contact with the external heater terminal 381 of the external connector 370 over the entire circumference. For this reason, the contact area between the plug heater terminal 345 and the external heater terminal 381 can be increased, and the contact resistance at this contact portion can be reduced. Therefore, the temperature control of the heater member 101 can be reliably performed during use.

Furthermore, in the third embodiment, since the plug heater terminal 345 also serves as a plug locking portion, the external connector 370 can be securely fixed by the plug heater terminal 345 and mechanical generated along with the locking. Using the stress, the plug heater terminal 245 and the external heater terminal 381 can be more reliably brought into contact with each other. Therefore, the electrical connection reliability between the plug heater terminal portion 345 and the external heater terminal 381 can be further improved.
In the third embodiment, since the first to third plug sensor terminals 348, 351, and 353 face radially inward, the first to third plug sensor terminals 348, 351, and 353 are radially outward. Compared with the case where it faces, these can be made the structure which can be easily waterproofed as mentioned above. In the third embodiment, the base end surface 340 of the connector connection body 340 is used as a seal part. However, a seal part may be provided on the outer periphery of the connector connection body 340.

In the third embodiment, the first to third plug sensor terminals 348, 351, and 353 are connected to one inner peripheral surface 342c, 343c, and 344c of the first to third plug inner peripheral stepped portions 342, 343, and 344, respectively. Since they are arranged one by one, when the external connector 370 is attached, the first to third plug sensor terminals 348, 351, 353 and the first to third external sensor terminals 383, 385, 387 not corresponding thereto Can be reliably prevented from being erroneously connected (for example, the first plug sensor terminal 348 and the second external sensor terminal 385 are erroneously connected).
In addition, the same parts as those in the first or second embodiment have the same actions and effects.

(Embodiment 4)
Next, a fourth embodiment will be described. In addition, description of the part similar to either of the said Embodiments 1-3 is abbreviate | omitted or simplified. 10 and 11 show a connector connection body (connector connection portion) 440 constituting the glow plug 400 with a sensor according to the fourth embodiment. FIG. 12 shows a connector connector 440 and an external connector 470 that constitute a glow plug connection structure 490 with a sensor according to the fourth embodiment. FIG. 13 shows the external connector 470. The glow plug 400 with sensor and the glow plug connection structure 490 with sensor according to the fourth embodiment are the same as the connector connection body 140, 240, 340 and the external connector 440 according to the first to third embodiments described above. The only difference from the connectors 170, 270, and 370 is the same as in the first embodiment.

  First, the connector connector 440 will be described. This connector connection body 440 is also formed by resin insert molding. The connector connector 440 has a bottomed cylindrical shape in which three holes having different inner diameters are stacked in the direction of the axis AX and open to the base end surface 440k, and three plug inner peripheral stepped portions in a step shape, that is, the tip From the side, a first plug inner peripheral stepped portion 442, a second plug inner peripheral stepped portion 443, and a third plug inner peripheral stepped portion 444 are formed. Further, a concave portion 441 similar to the concave portion 341 of the third embodiment is provided outside the connector connector 440.

  A plug heater terminal 445 similar to the plug heater terminal 345 of the third embodiment is disposed on the concave surface 441c of the concave portion 441. The plug heater terminal 445 is electrically connected to the heater pin 446 protruding from the front end surface 440 s of the connector connection body 440 inside the connector connection body 440. Accordingly, the plug heater terminal 445 can be electrically connected to an external heater terminal 481 of an external connector, which will be described later, in contact with the entire circumference in the circumferential direction, and as a plug locking portion for fixing the external connector 470, The external heater terminal 381 can be engaged.

  Of the three plug inner peripheral stepped portions 442, 443, and 444, an inner peripheral surface 442c of the smallest diameter first plug inner peripheral stepped portion 442 located on the distal end side is an elongated cylinder facing radially inward. A first plug sensor terminal 448 is disposed. The first plug sensor terminal 448 is electrically connected to the first sensor pin 449 protruding from the distal end surface 440 s of the connector connecting body 440 to the inside of the connector connecting body 440. The first plug sensor terminal 448 is in contact with and electrically connected to a first external sensor terminal 483 of an external connector 470 described later over the entire circumference.

  On the inner peripheral surface 443c of the second plug inner peripheral stepped portion 443, a ring-shaped second plug sensor terminal 451 facing the radially inner side is disposed. The 22nd plug sensor terminal 451 is electrically connected to the second sensor pin 452 protruding from the distal end surface 440 s of the connector connecting body 440 toward the distal end side inside the connector connecting body 440. The second plug sensor terminal 451 is in contact with and electrically connected to a second external sensor terminal 485 of the external connector 470 described later over the entire circumference.

  On the inner peripheral surface 444c of the third plug inner peripheral stepped portion 444, a ring-shaped third plug sensor terminal 453 facing radially inward is disposed. The third plug sensor terminal 453 is electrically connected to the third sensor pin 454 protruding from the distal end surface 440 s of the connector connection body 440 toward the distal end side in the connector connection body 440. The third plug sensor terminal 453 is in contact with and electrically connected to a third external sensor terminal 487 of an external connector 470 described later over the entire circumference.

  Next, the external connector 470 will be described (see FIGS. 12 and 13). The external connector 470 has a cylindrical wall portion 470f that opens in the distal end surface 370s and forms a cylindrical shape. And inside this cylinder wall part 470f, a cylinder with different outer diameters is overlapped in the axis AX direction and has a form that becomes smaller in diameter toward the tip side, and has two outer peripheral stepped parts in a step shape, that is, the tip side Thus, a first external outer peripheral stepped portion 477 and a second outer outer peripheral stepped portion 478 are formed.

  An external heater terminal 481 similar to the external heater terminal 381 of the third embodiment is disposed at a predetermined position on the tip side of the inner peripheral surface 470fc of the cylindrical wall portion 470f. Further, an external seal member 484 similar to the external seal member 384 of the third embodiment is disposed at a predetermined position inside the base end portion 470k of the external connector 470.

A rod-shaped first external sensor terminal 483 that protrudes toward the distal end is disposed at the center of the distal end surface 477 s of the first outer peripheral stepped portion 477. The first external sensor terminal 483 is inserted into the first plug sensor terminal 448 having a long and narrow cylindrical shape of the connector connection body 440, and is pressed and electrically connected over the entire circumference in the circumferential direction.
Further, a second external sensor terminal 485 similar to the second external sensor terminal 485 of the third embodiment is disposed on the outer peripheral surface 477c of the first external outer peripheral stepped portion 477. The second external sensor terminal 485 is also electrically connected in pressure contact with the second plug sensor terminal 451 of the connector connector 440 over the entire circumference by the urging force of the bent portion.

  A third external sensor terminal 487 similar to the third external sensor terminal 387 of the third embodiment is disposed on the outer peripheral surface 478c of the second external outer peripheral stepped portion 478. This third external sensor terminal 487 is also electrically connected in pressure contact with the third plug sensor terminal 453 of the connector connector 440 over the entire circumference by the biasing force of the bent portion.

  By attaching such an external connector 470 to the glow plug 400 with sensor from the base end side, a glow plug connection structure 490 with sensor is configured. The external connector 470 covers the connector connecting portion 440, and the plug heater terminal 445 and the external heater terminal 481 are engaged with each other, whereby the external connector 470 is fixed to the glow plug 400 with sensor. Then, the plug heater terminal 445 of the connector connector 440 and the external heater terminal 481 of the external connector 470 are electrically connected in pressure contact over the entire circumference in the circumferential direction. In addition, the first to third plug sensor terminals 448, 451, and 453 of the connector connector 440 and the first to third external sensor terminals 483, 485, and 487 of the external connector 470 respectively extend over the entire circumference in the circumferential direction. It is pressed and electrically connected. Also, the external seal member 484 of the external connector 470 is in close contact with the entire base end surface 440k of the connector connector 440, and the first to third plug sensor terminals 448, 451, 453 and the The first to third external sensor terminals 483, 485, 487 are sealed.

As described above, also in the fourth embodiment, the plug heater terminal 445 is disposed radially outside of any of the plug sensor terminals 448, 451, and 453, so that the size of the plug heater terminal 445 can be increased. . The plug heater terminal 445 has a ring shape, and is in pressure contact with the external heater terminal 481 of the external connector 470 over the entire circumference. For this reason, the contact area between the plug heater terminal 445 and the external heater terminal 481 can be increased, and the contact resistance at this contact portion can be reduced. Therefore, the temperature control of the heater member 101 can be reliably performed during use.
In addition, the same parts as those in any of the first to third embodiments have similar actions and effects.

(Embodiment 5)
Next, a fifth embodiment will be described. In addition, description of the part similar to any of the said Embodiment 1-4 is abbreviate | omitted or simplified. 14 and 15 show a connector connector (connector connector) 540 constituting the glow plug 500 with a sensor according to the fifth embodiment. FIG. 16 shows a connector connector 540 and an external connector 570 that constitute a glow plug connection structure 590 with a sensor according to the fifth embodiment. FIG. 17 shows the external connector 570. In the glow plug 500 with sensor and the glow plug connection structure 590 with sensor of the fifth embodiment, the connector connection body 540 and the external connector 570 have the connector connection bodies 140, 240, 340 and 440 of the first to fourth embodiments. And only different from the external connectors 170, 270, 370, 470. The rest is the same as in the first embodiment.

  First, the connector connector 540 will be described. This connector connector 540 is also formed by resin insert molding. This connector connector 540 has a bottomed cylindrical shape in which four holes having different inner diameters are stacked in the direction of the axis AX and open to the base end surface 540k, and four plug inner peripheral stepped portions in a stepped manner, that is, the tip From the side, a first plug inner circumferential stepped portion 542, a second plug inner circumferential stepped portion 543, a third plug inner circumferential stepped portion 544, and a fourth plug inner circumferential stepped portion 541 are formed. Further, a concave portion (plug locking portion) 547 having a semicircular cross section in the circumferential direction is formed on the outer side of the connector connector 540 in the same manner as the concave portion 341 of the third embodiment.

  On the inner peripheral surface 541c of the fourth plug inner peripheral stepped portion 541 having the largest diameter located on the proximal end side, a ring-shaped plug heater terminal 545 facing the inner side in the radial direction of the axis AX is disposed. The plug heater terminal 545 is electrically connected to the heater pin 546 protruding from the front end surface 540 s of the connector connection body 540 inside the connector connection body 540. The plug heater terminal 545 is in contact with and electrically connected to an external heater terminal 581 of an external connector 570, which will be described later, over the entire circumference.

  On the inner peripheral surface 543c of the second plug inner peripheral stepped portion 543, a ring-shaped second plug sensor terminal 551 similar to the second plug sensor terminal 451 of the fourth embodiment is disposed. The second plug sensor terminal 551 is electrically connected to the second sensor pin 552 protruding from the front end surface 540 s of the connector connection body 540 inside the connector connection body 540. The second plug sensor terminal 551 is in contact with and electrically connected to a second external sensor terminal 585 of an external connector 570 described later over the entire circumference.

  A ring-shaped third plug sensor terminal 553 similar to the third plug sensor terminal 453 of the fourth embodiment is disposed on the inner peripheral surface 544c of the third plug inner peripheral stepped portion 544. The third plug sensor terminal 553 is electrically connected to the third sensor pin 554 protruding from the front end surface 540 s of the connector connector 540 inside the connector connector 540. The third plug sensor terminal 553 is in contact with and electrically connected to a third external sensor terminal 587 of an external connector 570 described later over the entire circumference.

  An elongated cylindrical first plug sensor terminal 548 similar to the first plug sensor terminal 448 of the fourth embodiment is formed on the inner peripheral surface 542c of the first plug inner peripheral stepped portion 542 having the smallest diameter located on the distal end side. Is arranged. The first plug sensor terminal 548 is electrically connected to the first sensor pin 549 protruding from the front end surface 540 s of the connector connection body 540 inside the connector connection body 540. The first plug sensor terminal 548 is in contact with and electrically connected to a first external sensor terminal 583 of an external connector 570 described later over the entire circumference.

  Next, the external connector 570 will be described (see FIGS. 16 and 17). The external connector 570 has a cylindrical wall portion 570f that opens in the distal end surface 570s and forms a cylindrical shape. And inside this cylindrical wall part 570f, a cylinder with different outer diameters is overlapped in the axis AX direction and has a form that becomes smaller in diameter toward the tip side, and has three outer peripheral stepped parts in a step shape, that is, the tip side A first outer peripheral stepped portion 577, a second outer peripheral stepped portion 578, and a third external outer peripheral stepped portion 575 are formed.

  A ring-shaped external locking portion 582 is disposed at a predetermined position on the distal end side of the inner peripheral surface 570fc of the cylindrical wall portion 570f. The external locking portion 582 has a circular cross section, and can be engaged with the concave portion 547 of the connector connector 540 over the entire circumference. Further, an external seal member 584 similar to the external seal member 384 of the third embodiment is disposed at a predetermined position inside the base end portion 570k of the external connector 570.

  A ring-shaped external heater terminal 585 is disposed on the outer peripheral surface 575c of the third outer peripheral stepped portion 575 having the largest diameter located on the base end side. The external heater terminal 585 is electrically connected to the plug heater terminal 545 of the connector connection body 540 by being pressed against the entire circumference in the circumferential direction by the urging force of the bent portion.

  On the other hand, at the center of the distal end surface 577s of the first outer peripheral stepped portion 577 having the smallest diameter located on the distal end side, a first external sensor protruding in a bar shape similar to the first external sensor terminal 483 of the fourth embodiment. A terminal 583 is provided. The first external sensor terminal 583 is inserted into the first plug sensor terminal 548 having a long and narrow cylindrical shape of the connector connection body 540, and is pressed and electrically connected over the entire circumference in the circumferential direction.

Further, a second external sensor terminal 585 similar to the second external sensor terminal 485 of the third embodiment is disposed on the outer peripheral surface 577c of the first outer outer stepped portion 577. The second external sensor terminal 585 is also electrically connected in pressure contact with the second plug sensor terminal 551 of the connector connector 540 over the entire circumference by the biasing force of the bent portion.
A third external sensor terminal 587 similar to the third external sensor terminal 387 of the third embodiment is disposed on the outer peripheral surface 578c of the second external outer peripheral stepped portion 578. The third external sensor terminal 587 is also electrically connected in pressure contact with the third plug sensor terminal 553 of the connector connector 540 over the entire circumference by the urging force of the bent portion.

  By attaching such an external connector 570 to the glow plug 500 with a sensor from the base end side, a glow plug connection structure 590 with a sensor is configured. The external connector 570 covers the connector connecting portion 540, and the external connector 570 is fixed to the sensor-attached glow plug 500 by engaging the concave portion 547 and the external locking portion 582 with each other. Then, the plug heater terminal 545 of the connector connector 540 and the external heater terminal 581 of the external connector 570 are electrically connected in pressure contact over the entire circumference in the circumferential direction. In addition, the first to third plug sensor terminals 548, 551, and 553 of the connector connector 540 and the first to third external sensor terminals 583, 585, and 587 of the external connector 570 respectively extend over the entire circumference. It is pressed and electrically connected. In addition, the external seal member 584 of the external connector 570 is in close contact with the entire base end surface 540k of the connector connector 540, and the plug heater terminal 545, the first to third plug sensor terminals 548, which are located radially inward from this. 551,553, the external heater terminal 581 and the first to third external sensor terminals 583,585,587 are sealed.

  As described above, also in the fifth embodiment, the plug heater terminal 545 is disposed on the radially outer side than any of the plug sensor terminals 548, 551, 553, so that the size of the plug heater terminal 545 can be increased. . Further, the plug heater terminal 545 has a ring shape and is in pressure contact with the external heater terminal 581 of the external connector 570 over the entire circumference. For this reason, the contact area between the plug heater terminal 545 and the external heater terminal 581 can be increased, and the contact resistance at this contact portion can be reduced. Therefore, the temperature control of the heater member 101 can be reliably performed during use.

In the fifth embodiment, the plug heater terminal 545 faces inward in the radial direction. Therefore, the plug heater terminal 545 can be easily waterproofed as described above, as compared with the case where the plug heater terminal 545 faces the radially outer side. In the fifth embodiment, the base end surface 540 of the connector connection body 540 is used as a seal part. However, a seal part may be provided on the outer periphery of the connector connection body 540.
In addition, the same parts as in any of the first to fourth embodiments have the same functions and effects.

(Embodiment 6)
Next, a sixth embodiment will be described. In addition, description of the part similar to any of the said Embodiment 1-5 is abbreviate | omitted or simplified. FIG. 18 shows a connector connection body (connector connection portion) 640 constituting the glow plug 600 with a sensor according to the sixth embodiment. FIG. 19 shows a connector connector 640 and an external connector 670 that constitute a glow plug connection structure 690 with a sensor according to the sixth embodiment. 20 and 21 show the external connector 670. In the glow plug 600 with sensor and the glow plug connection structure 690 with sensor of the sixth embodiment, the connector connection body 640 and the external connector 670 have the connector connection bodies 140, 240, 340, and 440 of the first to fifth embodiments. , 540 and the external connectors 170, 270, 370, 470, and 570, and the rest is the same as in the first embodiment.

First, the connector connector 640 will be described. This connector connector 640 is also formed by resin insert molding. The connector connector 640 has a bottomed cylindrical shape that opens to the base end surface 640k.
A ring-shaped plug heater terminal 645 facing the outer side in the radial direction of the axis AX is disposed on the tip side of the outer peripheral surface 640c of the connector connecting body 640. The plug heater terminal 645 is electrically connected to the heater pin 646 protruding from the distal end surface 640 s of the connector connection body 640 inside the connector connection body 640. The plug heater terminal 645 contacts and is electrically connected to two external heater terminals 681 of an external connector 670 described later at two locations in the circumferential direction. Further, a concave portion (plug locking portion) 647 having a semicircular cross section in the circumferential direction is formed on the front end side of the plug heater terminal 645 in the same manner as the concave portion 547 of the fifth embodiment.

Inside the connector connector 640, a rod-shaped first plug sensor terminal 648, a second plug sensor terminal 651, and a third plug sensor terminal 653 projecting toward the base end side are disposed.
The first plug sensor terminal 648 is electrically connected to the first sensor pin 649 protruding from the distal end surface 640 s of the connector connection body 640 inside the connector connection body 640. On the other hand, the first plug sensor terminal 648 is in contact with and electrically connected to a first external sensor terminal 683 of an external connector 670 described later.

The second plug sensor terminal 651 is electrically connected to the second sensor pin 652 protruding from the distal end surface 640 s of the connector connector 640 inside the connector connector 640. On the other hand, the second plug sensor terminal 651 contacts and is electrically connected to a second external sensor terminal 685 of an external connector 670 described later.
The third plug sensor terminal 653 is electrically connected to the third sensor pin 654 protruding from the distal end surface 640 s of the connector connection body 640 inside the connector connection body 640. On the other hand, the third plug sensor terminal 653 contacts and is electrically connected to a third external sensor terminal 687 of the external connector 670 described later.

Next, the external connector 670 will be described (see FIGS. 19 to 21). The external connector 670 has a cylindrical wall portion 670f that opens to the distal end surface 670s and forms a cylindrical shape. In addition, a cylindrical protrusion 674 that protrudes from the base end portion 670k to the distal end side is formed inside the cylindrical wall portion 670f.
A ring-shaped outer diameter stop portion 682 similar to the outer locking portion 582 of the fifth embodiment is disposed at a predetermined position on the distal end side of the inner peripheral surface 670fc of the cylindrical wall portion 670f. The external locking portion 682 can engage with the concave portion 647 of the connector connector 640 over the entire circumference. Further, an external seal member 684 similar to the external seal member 384 of the third embodiment is disposed at a predetermined position inside the base end portion 570k of the external connector 570.

  Further, two external heater terminals 681 are arranged opposite to each other on the proximal end side of the inner peripheral surface 670fc of the cylindrical wall portion 670f with respect to the external locking portion 682. Each of these external heater terminals 681 is bent inwardly at the tip end side so as to have a substantially J-shaped cross section, and by the urging force of the bent portion, the external heater terminal 681 and the plug heater terminal 645 of the connector connector 640 are surrounded. It is electrically connected by pressure contact at two locations in the direction.

The projecting portion 674 is provided with three bottomed holes (a first bottomed hole 676, a second bottomed hole 677, and a third bottomed hole 678) that open in the distal end surface 674s and extend in the axis AX direction. (See FIG. 21).
Among these, an elongated cylindrical first external sensor terminal 683 is disposed on the inner peripheral surface 676 c of the first bottomed hole 676. The first external sensor terminal 683 is in pressure contact with the first plug sensor terminal 648 of the connector connector 640 inserted therein, and is electrically connected thereto.

In addition, an elongated cylindrical second external sensor terminal 685 is disposed on the inner peripheral surface 677c of the second bottomed hole 677. The second external sensor terminal 685 is in pressure contact with the second plug sensor terminal 651 of the connector connector 640 inserted therein, and is electrically connected thereto.
In addition, an elongated cylindrical third external sensor terminal 687 is disposed on the inner peripheral surface 678c of the third bottomed hole 678. The third external sensor terminal 687 is in pressure contact with the third plug sensor terminal 653 of the connector connector 640 inserted therein, and is electrically connected thereto.

  By attaching the external connector 670 to the glow plug 600 with a sensor from the base end side, a glow plug connection structure 690 with a sensor is configured. The external connector 670 covers the connector connecting portion 640, and the external connector 670 is fixed to the sensor-equipped glow plug 600 by the concave portion 647 and the external locking portion 682 engaging with each other. Then, the plug heater terminal 645 of the connector connector 640 and the two external heater terminals 681 of the external connector 670 are electrically connected in pressure contact at two locations in the circumferential direction. In addition, the first to third plug sensor terminals 648, 651, and 653 of the connector connector 640 and the first to third external sensor terminals 683, 685, and 687 of the external connector 670 are electrically connected to each other. . Also, the external seal member 684 of the external connector 670 is in close contact with the entire base end surface 640k of the connector connector 640, and the first to third plug sensor terminals 648, 651, 653 and the The first to third external sensor terminals 683, 685, 687 are sealed.

As described above, also in the sixth embodiment, the plug heater terminal 645 is disposed on the outer side in the radial direction from any of the plug sensor terminals 648, 651, 653, so that the size of the plug heater terminal 645 can be increased. . The plug heater terminal 645 is in pressure contact with the two external heater terminals 681 of the external connector 670 at two locations in the circumferential direction. For this reason, the contact area between the plug heater terminal 645 and the external heater terminal 681 can be increased, and the contact resistance at this contact portion can be reduced. Therefore, the temperature control of the heater member 101 can be reliably performed during use.
In addition, the same parts as in any of the first to fifth embodiments have the same actions and effects.

  In the above, the present invention has been described with reference to the embodiments. However, the present invention is not limited to the above-described first to sixth embodiments, and can be appropriately modified and applied without departing from the gist thereof. Not too long.

It is an external view of a glow plug with a sensor and an external connector according to the first embodiment. It is explanatory drawing which shows the structure of a sensor part vicinity among the glow plugs with a sensor which concerns on Embodiment 1. FIG. It is an external view of a connector connection object among glow plugs with a sensor concerning Embodiment 1. FIG. It is a longitudinal cross-sectional view of a connector connection body and an external connector among the glow plug connection structures with a sensor which concern on Embodiment 1. FIG. It is an external view of a connector connector among glow plugs with a sensor concerning Embodiment 2. FIG. It is a longitudinal cross-sectional view of a connector connection body and an external connector among the glow plug connection structures with a sensor which concern on Embodiment 2. FIG. It is an external view of a connector connector among glow plugs with a sensor concerning Embodiment 3. It is explanatory drawing which shows the AA cross section in FIG. 7 of a connector connection body among the glow plugs with a sensor which concerns on Embodiment 3. FIG. It is explanatory drawing which shows the longitudinal cross-section of a connector connection body and an external connector among the glow plug connection structures with a sensor which concerns on Embodiment 3. FIG. It is an external view of a connector connector among glow plugs with a sensor concerning Embodiment 4. It is explanatory drawing which shows the BB cross section in FIG. 10 of a connector connection body among the glow plugs with a sensor which concerns on Embodiment 4. FIG. It is explanatory drawing which shows the longitudinal cross-section of a connector connection body and an external connector among the glow plug connection structures with a sensor which concerns on Embodiment 4. FIG. It is explanatory drawing which shows the longitudinal cross-section of an external connector among the glow plug connection structures with a sensor which concerns on Embodiment 4. FIG. It is an external view of a connector connector among glow plugs with a sensor concerning Embodiment 5. FIG. It is explanatory drawing which shows CC cross section in FIG. 14 of a connector connector among the glow plugs with a sensor which concerns on Embodiment 5. FIG. It is explanatory drawing which shows the longitudinal cross-section of a connector connection body and an external connector among the glow plug connection structures with a sensor which concerns on Embodiment 5. FIG. It is explanatory drawing which shows the longitudinal cross-section of an external connector among the glow plug connection structures with a sensor which concerns on Embodiment 5. FIG. It is an external view of a connector connector among glow plugs with a sensor concerning Embodiment 6. FIG. It is explanatory drawing which shows the longitudinal cross-section of a connector connection body and an external connector among the glow plug connection structures with a sensor which concerns on Embodiment 6. FIG. It is explanatory drawing which shows the longitudinal cross-section of an external connector among the glow plug connection structures with a sensor which concerns on Embodiment 5. FIG. It is an external view of an external connector among glow plug connection structures with a sensor concerning Embodiment 5. FIG.

Explanation of symbols

100, 200, 300, 400, 500, 600 Glow plug 101 with sensor Heater member (heater part)
120 Sensor part 140,240,340,440,540,640 Connector connection body (connector connection part)
145, 245, 345, 445, 545, 645 Plug heater terminals 147, 247, 345, 445, 547, 647 Plug locking portions 148, 248, 348, 448, 548, 648 First plug sensor terminals 150, 250 Plug seal Member 151,251,351,451,551,651 2nd plug sensor terminal 153,253,353,453,553,653 3rd plug sensor terminal 170,270,370,470,570,670 External connector 181,281, 381,481,581,681 External heater terminals 183,283,383,483,583,683 First external sensor terminals 185,285,385,485,585,685 Second external sensor terminals 187,287,387,487, 587,687 Third external sensor terminal 90,290,390,490,590,690 glow plug connection structure AX axis with sensor

Claims (15)

A heater that heats up by energization;
A sensor unit capable of detecting the state in the combustion chamber of the internal combustion engine;
A connector connecting portion to which an external connector is connected,
A plug heater terminal portion that is electrically connected to the heater portion and configured to be electrically connected to an external heater terminal portion disposed in the external connector, and
A connector connecting portion having a plug sensor terminal portion electrically connected to the sensor portion and configured to be electrically connected to an external sensor terminal portion disposed in the external connector;
A glow plug with a sensor comprising:
The plug heater terminal portion is
The plug sensor terminal portion is disposed on the outer side in the radial direction of the axis of the connector connecting portion, and
A glow plug with a sensor configured to be press-contacted with the external heater terminal at a plurality of locations in a circumferential direction of the axis. A glow plug with a sensor according to claim 1,
The plug heater terminal portion is
A glow plug with a sensor facing the outside in the radial direction of the axis. A glow plug with a sensor according to claim 1,
The connector connecting portion has a cylindrical shape,
The plug heater terminal portion is a glow plug with a sensor which faces the inside in the radial direction of the axis. A glow plug with a sensor according to any one of claims 1 to 3,
The connector connecting portion is
A glow plug with a sensor having a plug locking portion configured to be able to latch the external connector. A glow plug with a sensor according to claim 4,
The plug heater terminal portion is
A glow plug with a sensor that also serves as the plug locking portion. A glow plug with a sensor according to any one of claims 1 to 5,
The plug sensor terminal portion is
A glow plug with a sensor facing the outside in the radial direction of the axis. A glow plug with a sensor according to claim 6,
A plurality of the plug sensor terminal portions are provided,
The plurality of plug sensor terminal portions are glow plugs with a sensor, which are arranged side by side in the axial direction. A glow plug with a sensor according to claim 7,
The connector connecting portion is configured to have a plurality of plug outer peripheral stepped portions whose outer peripheral shape forms a step shape,
A plurality of plug sensor terminal portions, a glow plug with a sensor, wherein one plug sensor terminal portion is disposed on one outer peripheral surface of each of the plurality of plug outer peripheral stepped portions. A glow plug with a sensor according to any one of claims 1 to 5,
The connector connecting portion has a cylindrical shape,
The plug sensor terminal portion is a glow plug with a sensor, which faces the inner side in the radial direction of the axis. A glow plug with a sensor according to claim 9,
A plurality of the plug sensor terminal portions are provided,
The plurality of plug sensor terminal portions are glow plugs with a sensor, which are arranged side by side in the axial direction. A glow plug with a sensor according to claim 10,
The connector connecting portion has a plurality of plug inner peripheral stepped portions whose inner peripheral shape forms a step shape,
The plurality of plug sensor terminal portions are glow plugs with sensors, each being arranged one by one on the inner peripheral surface of the plurality of plug inner peripheral stepped portions. A glow plug with a sensor according to any one of claims 1 to 11,
The plug sensor terminal portion is
A glow plug with a sensor configured to be press-contacted with the external sensor terminal portion at a plurality of locations in the circumferential direction of the axis. A glow plug with a sensor according to any one of claims 1 to 12,
When the external connector is connected, it is interposed between the external connector and the connector connecting portion, and is configured to prevent water from entering the plug sensor terminal portion and the external sensor terminal portion. A plug seal member,
A glow plug with a sensor, comprising a plug seal member disposed radially inward of the axis relative to the plug heater terminal portion. A glow plug with a sensor according to any one of claims 1 to 13,
The connector connecting portion is
Glow plug with sensor formed by resin insert molding. A glow plug connection structure with a sensor in which an external connector is connected to a glow plug with a sensor,
An external connector provided with an external heater terminal and an external sensor terminal; and
A glow plug with a sensor having a heater portion that is heated by energization, and a sensor portion that can detect the state in the combustion chamber of the internal combustion engine,
A connector connecting portion to which the external connector is connected,
A plug heater terminal part electrically connected to the heater part and electrically connected to the external heater terminal part of the external connector; and
A connector connecting part having a plug sensor terminal part electrically connected to the sensor part and electrically connected to the external sensor terminal part of the external connector,
The plug heater terminal portion is disposed on the outer side in the radial direction of the axis of the connector connecting portion than the plug sensor terminal portion, and is pressed against the external heater terminal portion at a plurality of locations in the circumferential direction of the axis. Glow plug with sensor
Glow plug connection structure with sensor.

Images