JP2002235648A - Ignitor for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ignitor for an internal combustion engine facilitating its mounting in an engine. SOLUTION: This ignitor for the engine comprises coil bodies 10, wiring boxes 20, connecting boxes 25, and a connector part 30. The overlap length between the wiring box 20 and the connecting box 25 can be made to differ mutually, and the wiring box 20 as well as the coil body 10 can longitudinally expand/contract by moving in an arrow X direction with its electrical connection with the connection box 25 secured. It is so constituted that the respective wiring boxes 20 are separated and can be extended/contracted longitudinally so that an interval between the respective coil bodies 10 becomes variable and therefore, a single-type ignitor can respond to the engines with the same number of cylinders. This constitution can dispense with newly designing an ignitor for each engine having different intervals so as to reduce the types of the ignitors. This constitution can thus expand the freedom degree of the device design.

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to an ignition device for an internal combustion engine.

[0001]

2. Description of the Related Art Heretofore, there has been known an ignition device in which an ignition plug is embedded in a plug hole formed in a cylinder head of an internal combustion engine (hereinafter, an "internal combustion engine" is referred to as an engine), and power is supplied directly to the ignition plug. I have. As a method of fixing this type of ignition device to the engine, a lower end portion of the ignition device inserted into the plug hole is fitted to the ignition plug, and then a mounting seat provided at the upper end portion of the ignition device is bolted to the engine. It is common. Then, a power supply connector for supplying a battery voltage or the like to the ignition device is connected to the ignition device assembled in the engine separately from the bolting of the ignition device.

[0002]

However, in the conventional method of assembling the ignition device, it is necessary to fix the ignition device to the engine by bolting or the like in order to surely prevent the ignition device from coming off the engine. Therefore, in order to assemble this type of ignition device to the engine, a fastening bolt and a man-hour for fastening the bolt are indispensable, resulting in an increase in product cost.

Further, in order to bolt the ignition device to the engine, a portion fixed to the engine by bolts,
In other words, since the mounting seat is required above the ignition device,
There is a problem that the size of the upper part of the ignition device exposed from the plug hole becomes large and the mountability is deteriorated. further,
In many cases, the shape of the mounting seat differs from engine to engine due to restrictions on mounting of the engine, and a problem arises in that the ignition device must be newly designed according to the type of engine.

Further, in recent years, the mounting space for the ignition device has been reduced due to a decrease in the diameter of the plug hole, an increase in the number of components mounted on the engine head, and the like. In this case, since a flat surface is required at the lower portion of the coil body to be sandwiched, there is a problem that the size of the ignition device becomes large and it becomes difficult to mount the ignition device on the engine.

Further, in order to improve the assembling property to an engine, a cassette type ignition device in which a stick coil and a wire are integrated has been recently adopted. In this cassette type ignition device, for example, as shown in FIG. 15, since the coil body 1 and the wiring box 2 are integrated,
The interval between the coil bodies 1 is fixed. For this reason, it is necessary to design an ignition device for each of the engines having the different intervals, and there is a problem that the types of the ignition devices increase.

In addition, since the coil body is conventionally directly mounted on the insulator or the washer of the spark plug, a load due to engine vibration or the like received by the coil body is directly applied to the spark plug, and the spark plug insulator may be damaged. However, there is a problem that the washer may be worn.

The present invention has been made to solve such a problem, and an object of the present invention is to provide an engine ignition device which can be easily mounted on an engine.

Another object of the present invention is to provide an ignition device for an engine in which the degree of freedom in design is increased. It is still another object of the present invention to provide an ignition device for an engine that enables standardization of the outer shape. Still another object of the present invention is to provide an engine ignition device that is easy to design. Still another object of the present invention is to provide an ignition device for an engine that can use common components. Still another object of the present invention is to provide an engine ignition device that can be easily mounted on an engine. Still another object of the present invention is to provide an engine ignition device that secures a space for mounting the engine.

Still another object of the present invention is to provide an engine ignition device capable of unifying standards. It is still another object of the present invention to provide an engine ignition device having a small size. Still another object of the present invention is to provide an engine ignition device that can be easily assembled to an engine. Still another object of the present invention is to provide an ignition device for an engine that prevents the coil body from coming off. Still another object of the present invention is to provide an engine ignition device that reduces the number of assembly steps for an engine.

Still another object of the present invention is to provide an ignition device for an engine which reduces the number of parts and the manufacturing cost. Still another object of the present invention is to provide an engine ignition device that reduces stress generated at a fitting portion between a coil body and an ignition plug. Still another object of the present invention is to provide an ignition device for an engine that prevents the insulator of the ignition plug from being damaged. Still another object of the present invention is to provide an ignition device for an engine that prevents a washer of a spark plug from being worn.

[0011]

According to the ignition device for an engine of the present invention, the inner box connects a plurality of outer boxes mechanically and electrically connected to the coil body, and the outer box connects the outer box to the coil body. Since a part is accommodated in the box and the length of the accommodating portion is variable, the interval between the coil bodies is variable, and an engine having the same number of cylinders can be handled by one type of ignition device. Therefore, it is not necessary to newly design an ignition device for each of the engines having the different intervals, and the number of types of the ignition devices can be reduced. Therefore, the degree of freedom in device design can be expanded.

Further, according to the ignition device for an engine according to the second aspect of the present invention, the inner box can be connected to the same number of outer boxes as the number of cylinders of the engine. By increasing or decreasing the number of boxes, it becomes possible to cope with engines with different numbers of cylinders, standardize the specifications of the ignition device, reduce the number of parts, and reduce the manufacturing cost.

According to the ignition device for an engine according to the third aspect of the present invention, when the ignition plug is inserted into the coil main body, the seal member for sealing the gap between the outer wall of the coil main body and the inner wall of the concave portion of the engine is formed of a coil. Since it is provided on the outer periphery of the main body, by reducing the diameter of the coil built in the coil main body, a space for mounting the seal member can be secured and the inner diameter seal structure can be adopted. For this reason, the lower flat surface of the upper portion of the coil body for sandwiching the seal member can be eliminated, and the size of the upper portion of the coil body exposed from the recess of the engine can be reduced. Therefore, the mountability on the engine is improved, and a space for mounting on the engine can be secured. In addition, a groove with a maze structure that allows communication from the recess of the engine to the outside is formed on the outer wall of the seal member, and this groove serves as an air vent hole, preventing the coil body from coming off due to pressure increase in the recess when assembling to the engine can do.

According to the ignition device for an engine of the present invention, when the ignition plug is inserted into the coil body, the sealing member for sealing the gap between the outer wall of the coil body and the inner wall of the recess of the engine is provided. Is provided on the outer circumference of the coil body, so that the diameter of the coil incorporated in the coil body is reduced, thereby securing a space for mounting the seal member and adopting the inner diameter seal structure. For this reason, the lower flat surface of the upper portion of the coil body for sandwiching the seal member can be eliminated, and the size of the upper portion of the coil body exposed from the recess of the engine can be reduced. Therefore,
The mountability on the engine is improved, and the mounting space for the engine can be secured. Further, a groove having a maze structure is formed on the outer wall closer to the ignition plug than the seal member of the coil body, and a hole that can communicate with the groove is formed in the seal member. It is possible to prevent the coil body from coming off due to a rise in pressure in the concave portion when the coil body is assembled.

According to the engine ignition device of the fifth aspect of the present invention, the ignition plug is inserted into the coil main body, and when the ignition plug is rotated about the axis of the coil main body, the ignition plug can be caught on the inner wall of the opening of the concave portion of the engine. Since possible hooking means are provided on the outer wall of the coil body, the ignition device can be easily mounted on the engine. For this reason, the fixing to the engine by, for example, bolting can be eliminated, and it is not necessary to provide a mounting seat on the coil body. Therefore, it is possible to standardize the outer shape of the ignition device, to reduce the size of the device, and to improve the mountability on the engine. Further, the number of man-hours for assembling to the engine can be reduced as compared with the case where the coil body is attached to the engine using fastening bolts or the like.

According to the ignition device for an engine of the present invention, when the ignition plug is inserted into the coil body and rotated about the axis of the coil body, the inner wall of the opening of the concave portion of the engine is inclined in the circumferential direction. Since the claw portion which can be hooked on the tapered surface formed as described above is provided on the outer wall of the coil body, the ignition device can be easily mounted on the engine. For this reason, the fixing to the engine by, for example, bolting can be eliminated, and it is not necessary to provide a mounting seat on the coil body. Therefore, it is possible to standardize the outer shape of the ignition device, to reduce the size of the device, and to improve the mountability on the engine. Further, the number of man-hours for assembling to the engine can be reduced as compared with the case where the coil body is attached to the engine using fastening bolts or the like.

According to the engine ignition device of the present invention, the spark plug is inserted into the coil body, and is press-fitted into the outer wall of the opening of the concave portion of the engine when rotated around the axis of the coil body. Since the member is provided on the outer wall of the coil body, the ignition device can be easily mounted on the engine. For this reason, the fixing to the engine by, for example, bolting can be eliminated, and it is not necessary to provide a mounting seat on the coil body. Therefore, it is possible to standardize the outer shape of the ignition device, to reduce the size of the device, and to improve the mountability on the engine. Further, the number of man-hours for assembling to the engine can be reduced as compared with the case where the coil main body is attached to the engine using fastening bolts or the like.

According to the ignition device for an engine of the present invention, the ignition plug is inserted into the coil body and is provided so as to project from the opening of the recess in the direction opposite to the recess when rotated about the axis of the coil body. Since the press-fit rib that is press-fitted into the projected portion is provided on the outer wall of the coil body, the ignition device can be easily mounted on the engine. For this reason,
For example, fixing to the engine by bolting can be eliminated, and it is not necessary to provide a mounting seat on the coil body. Therefore, it is possible to standardize the outer shape of the ignition device,
The physique of the device is reduced in size and the mountability on the engine is improved. Further, the number of man-hours for assembling to the engine can be reduced as compared with the case where the coil main body is attached to the engine using fastening bolts or the like. In addition, since the centering means for preventing the shaft from being deflected when rotated about the axis of the coil body is provided on the outer wall of the coil body, the assembly to the engine becomes easy, and the number of assembling steps is further reduced. be able to.

According to the igniter for an engine of the ninth aspect of the present invention, the rod member that can be fitted into the groove formed in the head of the coil body is provided inside the cover member that covers the head. Therefore, by attaching the cover member to the engine, the ignition device can be easily mounted on the engine. For this reason, the fixing to the engine by, for example, bolting can be eliminated, and it is not necessary to provide a mounting seat on the coil body. Therefore, it is possible to standardize the outer shape of the ignition device, to reduce the size of the device, and to improve the mountability on the engine. Further, the number of man-hours for assembling to the engine can be reduced as compared with the case where the coil main body is attached to the engine using fastening bolts or the like.

According to the ignition device for an engine of the tenth aspect of the present invention, the protrusion that can be fitted into the groove formed in the head of the coil body is provided inside the cover member that covers the head. Therefore, by attaching the cover member to the engine, the ignition device can be easily mounted on the engine. For this reason, the fixing to the engine by, for example, bolting can be eliminated, and it is not necessary to provide a mounting seat on the coil body. Therefore, it is possible to standardize the outer shape of the ignition device, to reduce the size of the device, and to improve the mountability on the engine. Further, the number of man-hours for assembling to the engine can be reduced as compared with the case where the coil body is attached to the engine using fastening bolts or the like.

According to the ignition device for an engine of the present invention, a rod member that can be fitted into a through hole formed in the head of the coil body is provided inside the cover member that covers the head. Therefore, by attaching the cover member to the engine, the ignition device can be easily mounted on the engine. For this reason, the fixing to the engine by, for example, bolting can be eliminated, and it is not necessary to provide a mounting seat on the coil body. Therefore, it is possible to standardize the outer shape of the ignition device, to reduce the size of the device, and to improve the mountability on the engine. Further, the number of man-hours for assembling to the engine can be reduced as compared with the case where the coil body is attached to the engine using fastening bolts or the like.

According to the igniter for an engine according to claim 12 or 13 of the present invention, there is provided a second screw portion which can be screw-coupled to a first screw portion provided on an outer wall of an opening of a concave portion of the engine. Since the fixing member for fixing the coil main body to the engine by the second screw part being screw-coupled to the first screw part is provided on the outer periphery of the coil main body separately from the coil main body, the ignition device can be easily manufactured. Can be mounted on the engine. For this reason, the fixing to the engine by, for example, bolting can be eliminated, and it is not necessary to provide a mounting seat on the coil body. Therefore, it is possible to standardize the outer shape of the ignition device, to reduce the size of the device, and to improve the mountability on the engine. Further, as compared with the case where the coil body is attached to the engine using fastening bolts or the like, the number of assembly steps to the engine can be reduced, the number of parts can be reduced, and the manufacturing cost can be reduced.

Further, according to the ignition device for an engine according to the thirteenth aspect of the present invention, since the connector capable of supplying electric power to the transformer portion built in the coil main body is provided in the coil main body so as to protrude in the axial direction. By extending the connector, the degree of freedom in setting the mounting angle of the coil body is improved. Therefore, the freedom of design is expanded,
Design becomes easier.

According to the ignition device for an engine of the present invention, there is provided a second screw portion which can be screw-coupled to a first screw portion provided on an outer wall of an opening of a concave portion of the engine. Since the fixing member for fixing the coil main body to the engine by screwing the second screw part to the first screw part is provided integrally with the coil main body on the outer wall of the coil main body, the ignition device can be easily mounted on the engine. Can be mounted. For this reason, the fixing to the engine by, for example, bolting can be eliminated, and it is not necessary to provide a mounting seat on the coil body. Therefore, it is possible to standardize the outer shape of the ignition device, to reduce the size of the device, and to improve the mountability on the engine. Further, as compared with the case where the coil body is attached to the engine using fastening bolts or the like, the number of assembly steps to the engine can be reduced, the number of parts can be reduced, and the manufacturing cost can be reduced.

Further, according to the ignition device for an engine of the present invention, a connector capable of supplying electric power to the transformer section built in the coil body is provided on the coil body so as to protrude in the axial direction. By extending the connector, the degree of freedom in setting the mounting angle of the coil body is improved. Therefore, the freedom of design is expanded,
Design becomes easier.

According to the ignition device for an engine of the present invention, the fixing means for elastically fixing the coil body for generating the high voltage applied to the ignition plug is provided at the connection between the ignition plug and the internal combustion engine. Therefore, the coil body does not have to be directly attached to the insulator or the washer of the spark plug. For this reason, a load due to engine vibrations and the like received by the coil body is not directly applied to the spark plug, so that stress generated at a fitting portion between the coil body and the spark plug is reduced, and the insulator of the spark plug is damaged, Can be prevented from being worn.

According to the ignition device for an engine of the present invention, since the fixing portion fixed to the bracket attached to the internal combustion engine together with the ignition plug is provided on the outer wall of the coil body, It is elastically fixed to the engine via the bracket. For this reason, a load due to engine vibrations and the like received by the coil body is not directly applied to the spark plug, so that stress generated at a fitting portion between the coil body and the spark plug is reduced, and the insulator of the spark plug is damaged, Can be prevented from being worn.

[0028]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; (First Embodiment) FIG. 1 shows an engine ignition device according to a first embodiment of the present invention. The first embodiment is an example in which the present invention is applied to an ignition device attached to a cylinder head of a four-cylinder engine. As shown in FIG. 1, the engine ignition device includes a coil body 10, a wiring box 20 as an outer box, and a connection box 25 as an inner box.
And a connector section 30. The coil body 10 incorporates a transformer (not shown) capable of generating a high voltage to be supplied to a spark plug (not shown) in a cylindrical housing formed of a resin and having a longer axis than the outer diameter. The transformer unit includes a secondary coil wound around a secondary bobbin located around a rod-shaped iron core (not shown), and a primary coil wound around a primary bobbin located around the secondary coil. One end of the secondary coil that generates a high voltage is electrically connected to the spark plug.

The wiring box 20 is mechanically and electrically connected to the coil body 10, and has an externally provided mounting portion 21 for bolting to a cylinder head (not shown). And a control circuit (not shown) for interrupting the current flowing through the control circuit. A connector 30 is provided at the left end of the wiring box 20 shown in FIG. This connector section 30
This is for receiving the power supplied to the control circuit unit from a power supply connector (not shown), and a plurality of terminals 31 are provided therein by insert molding or the like.

The connection box 25 is connected to each wiring box 20.
The wiring box 20 is partially housed, and the length of the housed portion is variable. The connection box 25 has a wiring unit (not shown) that is electrically connected to the control circuit unit of each wiring box 20.

The wiring box 20 and the connection box 25 can have different overlapping lengths, and the wiring box 20 and the coil body 10 can be electrically connected to the connection box 25 together with the coil box 10. By moving in the direction indicated by the arrow X shown in FIG.

In the first embodiment configured as described above, each wiring box 20 is separated and is configured to be extendable and contractible in the longitudinal direction, so that the interval between the coil bodies 10 is variable, and the same number of cylinders is provided. One type of ignition device can be used for the engine. Therefore, it is not necessary to newly design an ignition device for each of the engines having the different intervals, and the number of types of the ignition devices can be reduced. Therefore, the degree of freedom in device design can be expanded.

In the above-described first embodiment, the ignition device attached to the cylinder head of the four-cylinder engine has been described, but the coil body 10 and the wiring box 2 are arranged in accordance with the number of cylinders.
By increasing or decreasing the number of zeros and the number of connection boxes 25, it is possible to cope with engines having different numbers of cylinders, standardize the specifications of the ignition device, reduce the number of parts, and reduce the manufacturing cost.

(Second Embodiment) A second embodiment is shown in FIGS. In the second embodiment, as shown in FIG.
The coil main body 40 is housed in a plug hole 101 as a concave portion of the cylinder head 100, a connector 42 is provided outside, and a head 41 containing a primary coil and a secondary coil (not shown) and a spark plug (not shown) A cylindrical tubular portion 43 to be inserted and a rubber 4 as a seal member
5 is provided.

The head 41 of the coil body 40 has a connection portion with the tube portion 43 having substantially the same diameter as the tube portion 43, and a rubber 45 is provided on the outer periphery of the connection portion. The rubber 45 has a groove 46 having a maze structure in the circumferential and axial directions on the outer wall. For this reason, as shown in FIG. 2, when the coil main body 40 is housed in the plug hole 101 of the cylinder head 100, that is, when the ignition plug is inserted into the cylindrical portion 43 of the coil main body, the outer wall of the cylindrical portion 43 Cylinder head 100
The rubber 45 seals a gap formed between the plug hole 101 and the inner wall of the plug hole 101. Further, since the groove 46 has a maze structure and can communicate between the inside of the plug hole 101 and the outside, intrusion of water from the outside into the inside of the plug hole 101 is prevented.
Air can escape freely from inside to outside. Therefore, as shown by the arrow in FIG. 3, when the coil body 40 is mounted on the cylinder head 100, an air vent path is formed through the groove 46 of the rubber 45.

In the second embodiment, since the diameter of the coil built in the head 41 of the coil body 40 is reduced, a space for mounting the rubber 45 is secured.
An inner diameter seal structure can be adopted. Therefore, the lower flat surface of the head 41 for sandwiching the rubber 45 can be eliminated, and the head 41 can be made smaller. Therefore, the mountability to the cylinder head 100 is improved,
A mounting space for the cylinder head 100 can be secured. Furthermore, since the groove portion 46 having a maze structure is formed on the outer wall of the rubber 45, the groove portion 46 serves as an air vent hole, and prevents the coil body 40 from coming off due to a rise in pressure inside the plug hole 101 when assembled to the cylinder head 100. be able to.

In the second embodiment, the groove 46 having a maze structure is formed on the outer wall of the rubber 45. However, in the present invention, a groove having a maze structure that is continuous from the outer wall of the housing of the coil body to the outer wall of the rubber may be formed. Alternatively, a groove having a maze structure may be formed in the outer wall of the housing of the coil body, and only the air vent hole may be formed in the rubber. In any case,
The same effects as in the second embodiment can be obtained.

(Third Embodiment) FIGS. 4 and 5 show a third embodiment. In the third embodiment, as shown in FIG.
The coil body 50 has a head 5 having a connector 51 provided externally and containing a primary coil and a secondary coil (not shown).
2 and a cylindrical tube portion 5 into which a spark plug (not shown) is inserted.
4 and a coil main body 50
Is the plug hole 2 as the recess of the cylinder head 200
01, that is, the tubular portion 54 of the coil body
When a spark plug is inserted into the plug hole 201, a rubber 53 for sealing the inside and the outside of the plug hole 201 and a lower outer wall of the head 52 between the cylindrical portion 54 and the rubber 53 are provided, and project in the radial direction. And a hook 55 as hooking means.

The opening of the plug hole 201 has an insertion hole 205 for inserting the claw 55 and a plug hole 2.
01 has a tapered surface 206 formed on the inner wall of the opening from the insertion hole 205 so as to be inclined in the circumferential direction. The attachment of the coil body 50 to the cylinder head 200 is described in FIG.
As shown by the arrow in FIG.
5 after inserting the spark plug into the cylinder 54 and inserting the spark plug into the cylinder 54 shown in FIG.
As shown by the arrow, the coil main body 50 is rotated about the axis, the claw portion 55 is moved from the insertion hole 205 along the tapered surface 206, and is hooked and fixed to the inner wall of the opening of the plug hole 201.

In the third embodiment, a spark plug is inserted into the coil body 50 and is formed on the inner wall of the opening of the plug hole 201 so as to be inclined in the circumferential direction when rotated about the axis of the coil body 50. Since the claw portion 55 that can be hooked on the surface 206 is provided on the lower outer wall of the head portion 52 of the coil body 50, the ignition device can be easily mounted on the engine. For this reason, fixing to the engine by, for example, bolting can be eliminated, and the coil body 50
There is no need to provide a mounting seat on the vehicle. Therefore, it is possible to standardize the outer shape of the ignition device, to reduce the size of the device, and to improve the mountability on the engine. Further, the number of man-hours for assembling to the engine can be reduced as compared with the case where the coil main body is attached to the engine using fastening bolts or the like.

(Fourth Embodiment) A fourth embodiment is shown in FIG. 6, FIG. 7 and FIG. In the fourth embodiment, as shown in FIGS. 6 and 7, the coil main body 60 has a head portion 62 containing a primary coil and a secondary coil (not shown) and a cylindrical shape for inserting a spark plug (not shown). A tubular portion 64 and a head 62
When the coil main body 60 is accommodated in the plug hole 301 as a concave portion of the cylinder head 300, that is, when the ignition plug is inserted into the cylindrical portion 64 of the coil main body, the inside of the plug hole 301 is A rubber 63 for sealing the outside, a flat L-shaped press-fitting rib 65 as a press-fitting member provided on the lower outer wall of the head 62 between the cylindrical portion 64 and the rubber 63 and protruding in the radial direction. And a flat I-shaped alignment section 66 as alignment means protruding in the direction. At the tip of the press-fitting rib 65, there is provided a press-fitting portion 65a in which an outer outer wall is formed with a radius in the circumferential direction.

The outer wall of the opening of the plug hole 301 has an annular protrusion 302 provided to protrude from the outer wall of the opening of the plug hole 301 in the direction opposite to the plug hole. The inner diameter of the protrusion 302 is slightly smaller than the distance between the press-fitting portions 65a of the two press-fitting ribs 65, and the two centering portions 6
6 is slightly larger than the distance between the tips. Projection 302
Is different from the radius formed at the press-fit portion 65a of the press-fit rib 65.

As shown in FIG. 8, the coil main body 60 is attached to the cylinder head 300 by inserting the coil main body 50 into the plug hole 201 and inserting the ignition plug into the cylinder portion 64, and then moving the coil main body 60 around the shaft center. And press-fit rib 6
5 is moved along the inner outer wall of the protruding portion 302, and the press-fit rib is formed on the inner outer wall of the protruding portion 302 by utilizing the difference between the inner radius of the protruding portion 302 and the radius of the press-fit portion 65a of the press-fit rib 65. The press-fit portion 65a of 65 is press-fitted and fixed. At this time, the inner diameter of the protrusion 302 is
By utilizing the fact that the distance is slightly larger than the distance between the distal ends of the coil body 60, the axial movement of the coil main body 60 can be prevented.

In the fourth embodiment, when a spark plug is inserted into the coil body 60 and is rotated about the axis of the coil body 60, the protrusion is provided so as to project from the outer wall of the opening of the plug hole 301 in the direction opposite to the plug hole. Since the press-fitting rib 65 that can be press-fitted into the portion 302 is provided on the lower outer wall of the head portion 62 of the coil main body 60, the ignition device can be easily mounted on the engine. For this reason, it is possible to abolish fixing to the engine by, for example, bolting, and it is not necessary to provide the coil body 60 with a mounting seat. Therefore, it is possible to standardize the outer shape of the ignition device, to reduce the size of the device, and to improve the mountability on the engine. Further, the number of man-hours for assembling to the engine can be reduced as compared with the case where the coil main body is attached to the engine using fastening bolts or the like.

Further, the centering portion 66 for preventing the shaft from being deflected when rotated about the axis of the coil body 60 is provided with the coil body 60.
Since it is provided on the outer wall of the engine, it is easy to assemble the engine, and the number of assembling steps can be further reduced.

(Fifth Embodiment) FIG. 9 shows a fifth embodiment.
The fifth embodiment is an example in which the present invention is applied to an ignition device attached to a cylinder head of a four-cylinder engine. FIG.
As shown in FIG.
, A cover member 80, and a rod member 77.

The coil body 70 incorporates a transformer (not shown) capable of generating a high voltage to be supplied to a spark plug (not shown) in a cylindrical housing made of, for example, resin and having a shaft length longer than the outer diameter. . This transformer section
A high voltage is generated by a secondary coil wound around a secondary bobbin located around a rod-shaped iron core (not shown) and a primary coil wound around a primary bobbin located around this secondary coil. One end of the secondary coil is electrically connected to a spark plug. Head 7 of coil body 70
2 has a groove 75 formed on the upper surface. The grooves 75 formed in the head 72 of each coil body 70 are all oriented in the same direction, and are arranged in a straight line. The cover member 80 covers the head 72 of each coil body 70, and is attached to a cylinder head (not shown) by bolting. A rod member 77 is provided inside the cover member 80, and both ends of the rod member 77 are fixed to the inner wall of the cover member 80, and sides of the rod member 77 fit into the groove portions 75 of each coil body 70. ing.

In the fifth embodiment, since the rod member 77 that can be fitted into the groove 75 formed in the head 72 of the coil body 70 is provided inside the cover member 80 that covers the head 72, By attaching the cover member 80 to the cylinder head, the ignition device can be easily mounted on the engine. For this reason, fixing to the engine by, for example, bolting can be eliminated, and the coil body 7
There is no need to provide a mounting seat on the zero. Therefore, it is possible to standardize the outer shape of the ignition device, to reduce the size of the device, and to improve the mountability on the engine. Further, the number of man-hours for assembling to the engine can be reduced as compared with the case where the coil main body is attached to the engine using fastening bolts or the like.

(Sixth Embodiment) FIG. 10 shows a sixth embodiment. The sixth embodiment is an example in which a protrusion is provided instead of the rod member 77 provided inside the cover member 80 of the fifth embodiment shown in FIG. In the sixth embodiment, as shown in FIG. 10, a protrusion 87 having an I-shaped cross section is provided on the inner wall of the cover member 85 so as to fit into a groove formed in the head of the coil body. In the sixth embodiment, the same effect as in the fifth embodiment shown in FIG. 9 can be obtained.

(Seventh Embodiment) FIG. 11 shows a seventh embodiment. Components that are substantially the same as those in the fifth embodiment shown in FIG. In the seventh embodiment, as shown in FIG. 11, a head 92 of a coil main body 90 has a through hole 95 formed to penetrate a side portion. The cover member 80 covers the head 92 of the coil main body 90 and is attached to a cylinder head (not shown) by bolting or the like. A rod member 77 is provided inside the cover member 80,
Both ends of the rod member 77 are fixed to a mounting portion 82 provided inside the cover member 80, and side portions are fitted into through holes 95 formed in a head portion 92 of the coil main body 90.

In the seventh embodiment, the rod member 77 that can be fitted into the through hole 95 formed in the head portion 92 of the coil main body 90 is provided inside the cover member 80 that covers the head portion 92. By attaching the cover member 80 to the cylinder head, the ignition device can be easily mounted on the engine. For this reason, fixing to the engine by, for example, bolting can be eliminated, and the coil body 9
There is no need to provide a mounting seat on the zero. Therefore, it is possible to standardize the outer shape of the ignition device, to reduce the size of the device, and to improve the mountability on the engine. Further, the number of man-hours for assembling to the engine can be reduced as compared with the case where the coil main body is attached to the engine using fastening bolts or the like.

(Eighth Embodiment) An eighth embodiment is shown in FIGS. In the eighth embodiment, as shown in FIGS. 12 and 13, the coil main body 110 is housed in a plug tube 125 as a recess assembled in the plug hole 501 of the cylinder head 500, and is made of, for example, resin. A transformer (not shown) capable of generating a high voltage to be supplied to the ignition plug 140 is built in a cylindrical housing having a shaft length longer than the diameter. The transformer unit includes a secondary coil wound around a secondary bobbin located around a rod-shaped iron core (not shown), and a primary coil wound around a primary bobbin located around the secondary coil. One end of the secondary coil that generates a high voltage is electrically connected to the spring 116.

The high voltage side of the coil main body 110 is fitted to the end of the spark plug 140 on the electrode 141 side to seal a high voltage.
15 and a fitting portion 114
1 that is housed inside and covers the periphery of the spring 116
17 and a spring 116. Therefore, the inside of one end of the rubber boot portion 115 is
4 is formed, and the other end side is formed in a shape capable of fitting the upper end of the spark plug 140 on the electrode portion 141 side.

The connector 130 capable of supplying electric power to the transformer section incorporated in the coil body 110 is provided at the upper part of the coil body 110 in FIG.
A plurality of terminals 131 and 13 shown in FIG.
2 is provided by insert molding or the like. The outer periphery of the coil body 110 and the connector 13 in FIG.
A fixed ring 120 having a flat hexagonal shape is provided separately from the coil main body 110 at a lower portion of the zero. The fixing ring 120 as a fixing member is for fixing the coil main body 110 to the cylinder head 500, and is screwed to a male screw part 126 as a first screw part formed on the outer wall of the opening of the plug tube 125. A female thread 121 as a possible second thread is formed on the inner wall. The coil body 110 is accommodated in the plug tube 125 below the fixing ring 120, and is formed between the outer wall of the coil body 110 and the inner wall of the plug tube 125 when the fixing ring 120 and the plug tube 125 are screwed together. Rubber 135 is provided for sealing the gap.

In the eighth embodiment, the plug tube 1
25 has a female screw part 121 which can be screw-coupled to a male screw part 126 provided on the outer wall of the opening.
Since the fixing ring 120 for fixing the coil body 110 to the cylinder head 300 is provided on the outer periphery of the coil main body 110 separately from the coil main body 110, the coil main body 110 is housed in the plug tube 125, and the fixing ring 120 is connected to a hexagon wrench or the like. By screw-connecting to the plug tube 125, the ignition device can be easily mounted on the engine. For this reason, for example, fixing to the engine by bolting can be eliminated, and it is not necessary to provide a mounting seat on the coil body 110. Therefore, it is possible to standardize the outer shape of the ignition device, to reduce the size of the device, and to improve the mountability on the engine. Further, as compared with the case where the coil body is attached to the engine using fastening bolts or the like, the number of assembly steps to the engine can be reduced, the number of parts can be reduced, and the manufacturing cost can be reduced.

In the eighth embodiment, the connector 13
Since 0 is provided on the coil body 110 so as to protrude in the axial direction, the degree of freedom in setting the mounting angle of the coil body 110 is improved by extending the connector 130. Therefore, the degree of freedom of design is expanded, and the design becomes easy.

In the eighth embodiment, the fixing ring 120 is provided on the outer periphery of the coil main body 110 separately from the coil main body 110. However, in the present invention, the fixing ring is provided integrally with the coil main body on the outer wall of the coil main body. Is also good. In this case, the coil main body can be fixed to the cylinder head by rotating the coil main body around the axis.

(Ninth Embodiment) A ninth embodiment is shown in FIG. As shown in FIG.
Includes a coil body 220, a bracket 250, and a spark plug 260.

The coil body 220 has a cylinder head 400
A transformer 240 capable of generating a high voltage to be supplied to an ignition plug 260 attached to a plug hole 401 serving as a recess is built in a cylindrical housing. The transformer section 240 includes a secondary coil 242 wound around a secondary bobbin (not shown) located around a rod-shaped iron core (not shown), and a primary coil wound around a primary bobbin (not shown) located around the secondary coil 242. One end of the secondary coil 241 that generates a high voltage is electrically connected to the ignition plug 260. The connector 230 capable of supplying electric power to the primary coil 241 is provided on an upper portion of the coil main body 220, and a terminal 231 is provided therein by insert molding or the like. A fixing portion 221 for fixing a bracket 250 described later is provided on the outer wall of the coil body 220.
Is provided.

The bracket 250 as a fixing means is for elastically fixing the coil body 220 to the cylinder head 400, and is fastened together with the ignition plug 260 to the cylinder head 400. It is fixed to. That is, bracket 2
Reference numeral 50 is provided at a connection portion between the ignition plug 260 and the cylinder head 400, and elastically fixes the coil body 210. The bracket 250 is formed in a bottomed cylindrical shape, has a hole 255 at the bottom for fitting to the ignition plug 260, and has a hole 251 at the side for fitting to the fixing part 221 of the coil body 220.

In the ninth embodiment, the spark plug 260
Without directly attaching the coil body 220 to the insulator or washer part of the cylinder head 40 via the bracket 250,
0, the coil body 220 is fixed elastically.
A load due to engine vibration or the like received by the coil main body 220 is not directly applied to the ignition plug 260. Therefore, stress generated in the fitting portion between the coil body 220 and the ignition plug 260 can be reduced, and damage to the insulator of the ignition plug 260 and wear of the washer can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of an engine ignition device according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a main part of an engine ignition device according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating an air vent path of an engine ignition device according to a second embodiment of the present invention.

FIG. 4 is a sectional view showing a main part of an engine ignition device according to a third embodiment of the present invention.

FIG. 5 is a plan view for explaining attachment of a coil body of an engine ignition device according to a third embodiment of the present invention.

FIG. 6 is a sectional view showing a main part of an engine ignition device according to a fourth embodiment of the present invention.

FIG. 7 is a perspective view showing a main part of an engine ignition device according to a fourth embodiment of the present invention.

FIG. 8 is a plan view showing a main part of an engine ignition device according to a fourth embodiment of the present invention.

FIG. 9 is a partially cutaway perspective view showing a main part of an engine ignition device according to a fifth embodiment of the present invention.

FIG. 10 is a perspective view showing a cover member of an engine ignition device according to a sixth embodiment of the present invention.

FIG. 11 is a partially cutaway perspective view showing a main part of an engine ignition device according to a seventh embodiment of the present invention.

FIG. 12 is a sectional view showing a main part of an engine ignition device according to an eighth embodiment of the present invention.

FIG. 13 is a view as seen in the direction of the arrow XIII in FIG. 12;

FIG. 14 is a sectional view showing a main part of an engine ignition device according to a ninth embodiment of the present invention.

FIG. 15 is a perspective view showing a main part of a conventional engine ignition device.

[Explanation of symbols]

10, 40, 50, 60, 70, 90, 110, 220
Coil main body 20 Wiring box (outer box) 25 Connection box (inner box) 30 Connector 41, 52, 62, 72, 92 Head 43, 54, 64 Tube 45 Rubber (seal member) 46 Groove 55 Claw (pull) Hanging means) 65 Press-fit rib (Press-fit means) 66 Alignment part (Alignment means) 75 Groove part 77 Rod member 80, 85 Cover member 87 Projection part 95 Through-hole 100, 200, 300, 400, 500 Cylinder head 101, 201, 301, 401, 501 Plug hole (recess) 120 Fixing ring (fixing member) 121 Female thread (second thread) 125 Plug tube (recess) 126 Male thread (first thread) 130 Connector 140, 260 Spark plug 206 Tapered surface 210 Ignition device 221 Fixing part 250 Bracket (fixing means 302 projecting portion

Continuing from the front page (72) Inventor Junichi Wada 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside Denso Corporation (72) Inventor Yoshihiro Shimode 1-1-1, Showa-cho, Kariya City, Aichi Prefecture Inside Denso Corporation ( 72) Inventor Masayasu Adachi 1-1-1, Showa-cho, Kariya-shi, Aichi Pref. Inside Denso Corporation (72) Inventor Atsune Kato 1-1-1, Showa-cho, Kariya-shi, Aichi Pref. F-term (reference) 3G019 KB09 KC05 KC07 KC10

Claims (17)

[Claims] A plurality of coil bodies for generating a high voltage applied to a spark plug of an internal combustion engine; a plurality of outer boxes mechanically and electrically connected to the coil body; and a plurality of outer boxes connected to each other. And an inner box partially accommodated in the outer box and having a variable length of the accommodated portion. 2. A plurality of coil bodies for generating a high voltage applied to a spark plug of an internal combustion engine, a plurality of outer boxes mechanically and electrically connected to the coil body, and a plurality of outer boxes connected to each other. An inner box partially accommodated in the outer box and having a variable length of the accommodated portion, wherein the inner box has the same number of the outer boxes as the number of cylinders according to the number of cylinders of the internal combustion engine. An ignition device for an internal combustion engine, which is connectable. 3. A coil main body for generating a high voltage applied to a spark plug embedded in a concave portion of the internal combustion engine; and a coil main body provided on an outer periphery of the coil main body, wherein the ignition plug is inserted into the coil main body. A seal member for sealing a gap between an outer wall of the coil body and an inner wall of the concave portion, the seal member having a groove having a maze structure capable of communicating from the concave portion to the outside; and an ignition for an internal combustion engine. apparatus. 4. A coil main body for generating a high voltage to be applied to a spark plug embedded in a recess of an internal combustion engine; and a coil main body provided on an outer periphery of the coil main body, wherein the ignition plug is inserted into the coil main body. A seal member for sealing a gap between an outer wall of the coil body and an inner wall of the recess; a groove having a maze structure formed on the outer wall of the coil body closer to the ignition plug than the seal member; and a seal member formed on the seal member. And an opening communicable with the groove. 5. A coil main body for generating a high voltage applied to a spark plug embedded in a recess of an internal combustion engine; and a coil main body provided on an outer wall of the coil main body, wherein the ignition plug is inserted into the coil main body. A hooking means capable of hooking on the inner wall of the opening of the recess when rotated about the axis of the main body. 6. A coil main body for generating a high voltage to be applied to a spark plug embedded in a recess of an internal combustion engine, and provided on an inner wall of an opening of the recess and formed to be inclined in a circumferential direction of the opening. A taper surface, a claw portion provided on an outer wall of the coil main body, wherein the spark plug is inserted into the coil main body, and which can be hooked on the taper surface when rotated about the axis of the coil main body, An ignition device for an internal combustion engine, comprising: 7. A coil body for generating a high voltage to be applied to a spark plug embedded in a recess of an internal combustion engine, provided on an outer wall of the coil body, wherein the spark plug is inserted into the coil body, and And a press-fitting member that is press-fitted into the outer wall of the opening of the recess when rotated about the axis of the main body. 8. A coil body for generating a high voltage to be applied to a spark plug embedded in a recess of the internal combustion engine, a projecting portion projecting from an opening of the recess in a direction opposite to the recess, and an outer wall of the coil body. A press-fit rib, which is inserted into the coil body and inserted into the projecting portion when the ignition plug is rotated about the axis of the coil body; and a coil body provided on an outer wall of the coil body. An ignition device for an internal combustion engine, comprising: a centering means for preventing shaft runout when the shaft is rotated about the center of the shaft. 9. A plurality of coil bodies for generating a high voltage to be applied to a spark plug of an internal combustion engine, a groove formed in a head of the coil body, a cover member for covering the head, And a rod member provided on the inside and capable of being fitted into the groove. 10. A plurality of coil bodies for generating a high voltage applied to a spark plug of an internal combustion engine, a groove formed in a head of the coil body, a cover member for covering the head, An ignition device for an internal combustion engine, comprising: a projection provided on the inner side and capable of being fitted into the groove. 11. A plurality of coil bodies for generating a high voltage applied to a spark plug of an internal combustion engine, a through hole formed in a head of the coil body, a cover member covering the head, and the cover member And a rod member that is provided inside and that can be fitted into the through hole. 12. A coil main body for generating a high voltage to be applied to a spark plug embedded in a concave portion of the internal combustion engine, a first screw portion provided on an outer wall of an opening of the concave portion, and an outer periphery of the coil main body. A second screw portion provided separately from the coil body and capable of being screw-coupled to the first screw portion; and the second screw portion being screw-coupled to the first screw portion. An ignition device for an internal combustion engine, comprising: a fixing member for fixing a coil body to the internal combustion engine. 13. A coil main body having a built-in transformer section for generating a high voltage applied to an ignition plug embedded in a concave portion of an internal combustion engine, and provided in the coil main body so as to protrude in an axial direction. A connector that can be supplied; a first screw portion provided on an outer wall of the opening of the concave portion; an outer periphery of the coil body that is provided separately from the coil body; A fixing member having a second screw portion, wherein the second screw portion is screw-coupled to the first screw portion to fix the coil body to the internal combustion engine. Ignition device. 14. A coil main body for generating a high voltage applied to a spark plug embedded in a concave portion of the internal combustion engine, a first screw portion provided on an outer wall of an opening of the concave portion, and an outer wall of the coil main body. A second screw portion provided integrally with the coil main body and capable of being screw-coupled to the first screw portion; and the second screw portion being screw-coupled to the first screw portion to form the coil main body. And a fixing member for fixing the ignition device to the internal combustion engine. 15. A coil body including a transformer for generating a high voltage to be applied to a spark plug embedded in a recess of an internal combustion engine; and a coil body protruding in an axial direction provided on the coil body to supply electric power to the transformer section. A connector that can be supplied; a first screw portion provided on an outer wall of the opening of the concave portion; a second screw portion provided integrally with the coil body on the outer wall of the coil body and capable of being screw-coupled to the first screw portion. And a fixing member for fixing the coil body to the internal combustion engine by the second screw portion being screw-coupled to the first screw portion. apparatus. 16. An ignition plug inserted into a recess of an internal combustion engine, a coil main body for generating a high voltage applied to the ignition plug, and a connection part between the ignition plug and the internal combustion engine, wherein the coil main body is provided. An ignition device for an internal combustion engine, comprising: fixing means for elastically fixing. 17. A spark plug inserted into a recess of the internal combustion engine, a coil body for generating a high voltage applied to the spark plug, a bracket attached to the internal combustion engine together with the spark plug, and an outer wall of the coil body. An ignition device for an internal combustion engine, comprising: a fixing portion provided and fixed to the bracket.