JP2011114979A - Motor device, pump using the motor, and liquid circulation system using the pump - Google Patents

Abstract

When assembling a substrate to a main body case, the terminal piece is guided, stress applied to the terminal piece is relieved, and a conduction failure is prevented from occurring between the terminal piece and the terminal receiver.
A motor includes a main body case, a drive mechanism attached to the main body case, and a substrate. The external power supply and drive mechanism and the substrate 30 are connected by terminal pieces 28 and 50 and a terminal receiver 32 fixed to the substrate 30. Each of the terminal pieces 28 and 50 is formed in a rod shape having a tapered tip portion, and has a configuration in which a barb 51 is provided at the tip portion. The terminal receiver 32 includes a cylindrical receiving portion 33. The receiving portion 33 includes a central portion 33a that contacts the terminal pieces 28 and 50, an upper end portion 33b that guides the terminal pieces 28 and 50 to the central portion 33a, and a lower end that locks the barbs 51 provided on the terminal pieces 28 and 50. Part 33c. The receiving portion 33 is provided with a slit along the axial direction and has elasticity in the radial direction.
[Selection] Figure 1

Description

  The present invention relates to a motor that drives a drive mechanism by supplying electric power from an external power source to a drive mechanism that performs rotational drive via a substrate, a pump that uses this motor, and a liquid circulation device that uses this pump. .

  Some motors, such as stepping motors, require a control circuit for rotational driving. Some servo motors have a control circuit for controlling the number of rotations.

  For example, a motor equipped with a control circuit as described above may include a substrate on which various electronic components that implement the control circuit are mounted and a drive mechanism that performs rotational drive attached to the main body case. is there.

  An external power supply is electrically connected to the board, and a terminal receiver is attached to the terminal that is electrically connected to the drive mechanism and fixed at a fixed position of the main body case, and is driven from the external power supply via the board. Power is supplied to the mechanism.

  This type of motor is used, for example, as a drive source for a pump that delivers a fluid such as liquid or gas. A pump using this type of motor is used to circulate liquid in a liquid circulation device. The liquid circulation device is used as, for example, a cooling device for cooling an inverter circuit in a so-called hybrid vehicle including an engine, a traveling motor, and an inverter circuit that drives the traveling motor.

  By the way, in the above-mentioned motor that electrically connects the board, the external power source, and the board, and the drive mechanism using the terminal and the terminal receiver, for example, a terminal 82 is formed in a plate shape as shown in FIG. A technique of forming the receiver 81 with a leaf spring is used. The terminal receiver 82 includes an upper portion 81a having a V-shaped cross section, a lower portion 81b having an inverted V-shaped cross section, and a central portion 81c that connects the upper portion 81a and the lower portion 81b and is soldered to the substrate 30. The bent portion of the upper portion 81a and the bent portion of the lower portion 81b are close to each other, and the terminal 82 is inserted between the bent portions that are close to each other.

  In addition to the technique shown in FIG. 9, the terminal 82 ′ is formed in a truncated cone shape and the terminal receiver 81 ′ is formed in a cylindrical shape as shown in FIG. 10 in addition to the technique shown in FIG. There is one in which the inner peripheral surface of the terminal receiver 81 ′ is formed so as to contact the outer peripheral surface of the terminal 82 ′ (see, for example, Patent Document 1).

JP 2006-204029 A

  In the technique shown in FIG. 9, the terminal 82 can be guided by the upper portion 81 a and the lower portion 81 b of the terminal receiver 81, and the stress acting on the terminal 82 when the terminal 82 is inserted is relieved by the elasticity of the terminal receiver 81. it can.

  On the other hand, in the technique shown in FIG. 10, the terminal 82 ′ can be guided by the inner peripheral surface of the terminal receiver 81 ′, and the terminal receiver 81 ′ and the terminal 82 ′ are in surface contact. A larger contact area than the conventional technology can be secured. However, it does not have elasticity, and the stress acting on the terminal 82 'when the terminal 82' is inserted into the terminal receiver 82 'cannot be relieved.

  By the way, when the motor is used for an application such as a pump of a cooling device for a hybrid vehicle, where strong vibration or impact is applied from the outside, the contact area between the terminal 82 and the terminal receiver 81 is small in the technique shown in FIG. Since the terminal receiver 81 is small and has elasticity, the terminal 82 and the terminal receiver 81 may be separated from each other due to vibration or impact, which may cause poor conduction.

  On the other hand, in the technique described in Patent Document 1, the contact area can be made larger than that in the technique shown in FIG. 9, but the terminal receiver 82 'does not have elasticity, and the terminal piece 81' is a truncated cone. Therefore, the connection between the terminal 82 ′ and the terminal receiver 81 ′ may be loosened due to vibration or impact, which may cause poor conduction.

  In addition, when used in an environment where dust or water is expected to enter, such as being mounted on a car, the main body case may be filled with an insulative fluid resin (so-called potting). When filling the potting, if the contact area between the terminal 82 and the terminal receiver 81 is small as in the technique shown in FIG. 9, there is a risk of causing poor conduction between the terminal 82 and the terminal receiver 81 due to potting.

  As described above, in the technique shown in FIG. 9, the terminal 82 can be guided, and the stress acting on the terminal 82 when the terminal 82 is inserted into the terminal receiver 81 can be relieved, but an impact or vibration is applied from the outside. There is a problem that conduction failure may occur when used in an environment where there is a lot of dust or water that requires potting.

  On the other hand, in the technique shown in FIG. 10, the terminal 82 ′ can be guided, but the stress acting on the terminal 82 ′ when the terminal 82 ′ is inserted into the terminal receiver 81 ′ cannot be relieved, and vibration and impact are not generated from the outside. When used for such applications, there is a problem that poor conduction may occur.

  The present invention has been made in view of the above reasons, and its purpose is to be able to guide the terminal, relieve stress applied to the terminal when the terminal is inserted into the terminal receiver, and the terminal and the terminal receiver. Another object of the present invention is to provide a motor, a pump, and a liquid circulation device that can prevent a conduction failure between them.

  The invention according to claim 1 is a main body case, a drive mechanism disposed at a fixed position of the main body case, a substrate housed in the main body case and electrically connected to an external power source, and a fixed position with respect to the main body case. A motor including a terminal piece fixed and electrically connected to a drive mechanism, and a terminal receiver attached to a substrate, each terminal piece being formed in a rod shape with a barb at the tip. Each terminal receptacle has an insertion hole into which the terminal piece is inserted and has elasticity in a direction intersecting the mouth axis direction of the insertion hole, and the peripheral wall of the insertion hole is in the mouth axis direction in which the peripheral surface of the terminal piece abuts And both end portions sandwiching the central portion in the mouth axis direction, one of the both end portions is provided with a guide surface that guides the tip end portion of the terminal piece to the central portion, and the other is a terminal piece. While locking the provided return, the end And forming a solder reservoir accumulated solder between the pieces.

  According to a second aspect of the present invention, in the first aspect of the present invention, the terminal piece includes a root portion that contacts the guide surface of the terminal receiver.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the terminal receiver includes positioning means that contacts one of the main body case and the drive mechanism in the direction of the mouth axis of the insertion hole. And

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the terminal receiver includes an engaging portion, and at least one of the main body case and the drive mechanism is engaged. It is characterized by including an engaged portion that engages with the portion.

  The invention according to claim 5 includes the motor according to any one of claims 1 to 4 and a pump chamber that houses an impeller rotated by the motor. An inflow pipe for allowing the fluid to flow into the pump chamber and an outflow pipe for allowing the fluid that flows into the pump chamber to flow out are projected.

  The invention described in claim 6 is characterized by comprising the pump described in claim 5 and a circulation pipe connected to the inflow pipe and the outflow pipe.

  According to the configuration of the first, fifth, and sixth aspects, the terminal piece is inserted into the terminal receiver by the advantage that the terminal piece can be guided by the guide surface provided on the peripheral wall of the insertion hole of the terminal receiver and the elasticity of the terminal receiver. There is an advantage that the stress acting on the terminal piece can be relieved, the terminal piece and the terminal receiver can be brought into surface contact, and the return of the terminal piece is locked by the peripheral wall of the insertion hole to prevent the terminal piece from coming off. In addition, the molten solder can be poured into the solder pool to fix the terminal piece and the terminal receiver. As a result, it is possible to prevent the occurrence of poor conduction between the terminal piece and the terminal receiver.

  According to the configuration of the second, fifth, and sixth aspects, since the terminal piece includes the root portion that contacts the guide surface of the terminal receiver, the contact area between the terminal piece and the terminal receiver is increased as compared with the invention according to the first aspect. As a result, there is an advantage that the effect of preventing the occurrence of poor conduction between the terminal piece and the terminal receiver can be enhanced as compared with the invention according to claim 1.

  According to the configuration of the third, fifth, and sixth aspects, since the terminal receiver includes positioning means that contacts one of the main body case and the drive mechanism in the mouth axis direction of the insertion hole, the connection between the terminal piece and the terminal receiver In addition, there is an advantage that the position of the substrate relative to the main body case can be determined.

  According to the configurations of the fourth, fifth, and sixth aspects, since the engaging portion and the engaged portion are engaged, when the vibration or impact is applied from the outside, the engagement between the engaging portion and the engaged portion is established. Further, there is an advantage that the movement and deformation of the substrate can be prevented by the combination of the terminal piece and the terminal receiver, and further, the stress acting on the terminal piece can be reduced when the movement and deformation of the substrate are prevented.

It is sectional drawing of the terminal piece and terminal receiver of Embodiment 1. FIG. It is explanatory drawing explaining the use same as the above. It is sectional drawing same as the above. It is a perspective view same as the above. It is sectional drawing of the principal part same as the above. It is a perspective view of a terminal receptacle same as the above. It is sectional drawing of another form same as the above. 6 is a cross-sectional view of a main part of Embodiment 2. FIG. It is sectional drawing of a prior art example. It is sectional drawing of another prior art example.

(Embodiment 1)
Hereinafter, the motor 1 (see FIG. 3) used for the pump 2 of the liquid circulation device 3 that is a cooling device of the hybrid vehicle 73 on which the engine 71 and the traveling motor 72 (for example, brushless DC motor) shown in FIG. 2 are mounted. Will be described as an example of the motor of the present invention.

  The hybrid vehicle 73 includes a battery 75 and an inverter 74 that drives the traveling motor 72 with electric power supplied from the battery 75. In addition to the function of driving the traveling motor 72, the inverter 74 has a function of rectifying the electricity generated by the traveling motor 72 during traveling by the engine 71 and supplying the rectified electricity to the battery 75 to charge the battery 75. That is, the inverter 74 generates heat not only when traveling by the traveling motor 72 but also when traveling by the engine 71. The hybrid vehicle 73 includes the liquid circulation device 3 for cooling the inverter 74.

  The liquid circulation device 3 includes a circulation pipe 76 through which cooling water circulates and the pump 2. As shown in FIGS. 3 and 4, the pump 2 includes a motor 1 including a main body case 20 made of a synthetic resin material, and a casing 60 made of a synthetic resin material and welded to the main body case 20.

  The casing 60 has an inflow protruding upward from a central portion of a cylindrical portion 61 having a fixed cylindrical shape opened downward (downward in FIG. 3) and a bottom wall (upper wall in FIG. 3) of the cylindrical portion 61. A pipe 62 and an outflow pipe 63 projecting sideways from the side wall of the tubular portion 61 are provided. The cylindrical portion 61 of the casing 60 forms a pump chamber 64 described later together with the main body case 20 by welding the lower end of the side wall to the main body case 20 of the motor 1. The inflow pipe 62 and the outflow pipe 63 are respectively connected to one of both ends of the circulation pipe 76 using a connecting member (not shown), and connect the internal space of the circulation pipe 76 and the internal space of the pump chamber 64.

  The motor 1 of the present embodiment that forms the pump 2 together with the casing 60 has a configuration in which the drive mechanism 10 that rotates and the substrate 30 are integrated by the main body case 20. The drive mechanism 10 includes a drive-side rotor 41 housed in the pump chamber 64 described above, and a fixed-side stator 11 disposed outside the pump chamber 64. That is, the motor 1 has a configuration in which the stator 11 on the fixed side and the rotor 41 on the driving side are separated by the wall of the main body case 20. The configuration of the stator 11 and the rotor 41 and the configuration of the above-described substrate 30 will be described later.

  The main body case 20 is formed in a box shape having a thin thickness in the vertical direction (vertical direction in FIG. 3) and is opened downward, and the bottom wall of the substrate storage part 21 (upper wall in FIG. 3). A bottomed cylindrical stator housing portion 22 projecting upward from the bottom and opening downward, and a bottomed tube projecting downward from the inner bottom surface (the lower surface of the upper wall in FIG. 3) of the stator housing portion 22 and opened upward And a rotor-shaped storage part 23. The central axis of the cylindrical stator storage portion 22 and the central axis of the cylindrical rotor storage portion 23 substantially coincide with each other. A plate-like back cover 24 that prevents water and dust from entering the substrate storage portion 21 and the stator storage portion 22 is attached to the opening surface of the substrate storage portion 21.

  The casing 60 described above is disposed above the rotor storage portion 23, and the lower end of the side wall of the cylindrical portion 61 is entirely welded to the upper surface of the bottom wall (upper wall in the drawing) of the stator storage portion 22 by laser welding or ultrasonic welding. It is fixed to the main body case 20 by being welded. That is, the pump chamber 64 is formed by the rotor storage portion 23 opened upward and the cylindrical portion 61 opened downward. Instead of welding the cylindrical portion 61 and the stator accommodating portion 22, the cylindrical portion 61 and the stator accommodating portion 22 are connected by using a seal member such as a packing formed in a ring shape and a fixing member such as a mounting screw. It can also be combined. That is, the ring-shaped seal member is inserted between the bottom wall of the stator housing portion 22 and the lower end of the tubular portion 61, and the tubular portion 61 and the stator housing portion 22 are coupled by the fixing member.

  A cylindrical fitting rib 23 a protrudes from the central portion of the inner bottom surface of the rotor storage portion 23 that forms the lower portion of the pump chamber 64. A fixing portion (not shown) for fixing the above-described stator 11 is provided on at least one of the outer peripheral surface of the side wall of the rotor storage portion 23 and the inner peripheral surface of the side wall of the stator storage portion 22. The function of the fitting rib 23a and the configuration of the fixing portion will be described later.

  At the lower end of the outer surface of the side wall of the substrate housing portion 21 of the main body case 20, a plurality of members for attaching the main body case 20 to a base member (not shown) attached to the vehicle body of the hybrid vehicle 73 (see FIG. 2). (In the illustrated example, three mounting plates 25) are projected. Anti-vibration rubber 26 for preventing transmission of vibration from the vehicle body is attached to each mounting plate 25. The main body case 20 is attached to the vehicle body with the back cover 24 as the above-described base member side (lower side).

  A connector 27 for connection to an external power source (for example, a battery 75) is provided on the bottom wall (upper wall in the figure) of the substrate housing portion 21 on the side opposite to the base member. The connector 27 includes a plurality of (four in the illustrated example) terminal pieces 28 penetrating through the bottom wall of the substrate storage portion 21 and the bottom of the substrate storage portion 21 so as to surround the upper portions of the four terminal pieces 28. A fitting rib 29 that protrudes upward from the wall and fits with an external power supply side connector (not shown) is provided. The terminal piece 28 is made of a metal material and is electrically connected to the substrate 30 using a terminal receiver 32 described later.

  Next, the stator 11 and the rotor 41 of the drive mechanism 10 will be described. The rotor 41 accommodated in the pump chamber 64 is formed in a cylindrical shape with a shaft 42 that is formed in a rod shape with a ceramic material and has a lower end portion that is fitted and fixed to the above-described fitting rib 23 a provided in the rotor accommodating portion 23. A bearing 43 penetrating the shaft 42 and an impeller 44 attached to the bearing 43 are provided. That is, the impeller 44 is rotatable in the circumferential direction of the shaft 42. The lower end of the bearing 43 is in contact with the upper end of the fitting rib 23a, the upper end of the bearing 43 is in contact with a ring-shaped bearing plate 45 penetrating the shaft 42, and the bearing 43 (that is, the impeller 44) is in the vertical direction. Movement is restricted.

  On the blades of the impeller 44 attached to the bearing 43, a magnet (not shown) that is magnetically coupled to the stator 11 on the fixed side as described later is formed continuously and integrally.

  The stator 11 includes a stator core 12 disposed in the stator housing portion 22 along the circumferential direction of the cylindrical rotor housing portion 23 so as to surround the rotor housing portion 23, and an upper and lower side sandwiching the stator core 12 in the vertical direction. And a pair of insulators 13.

  Openings of storage recesses 13 a for storing the windings 14 are respectively formed on the upper surface of the upper insulator 13 and the lower surface of the lower insulator 13, and the windings 14 are wound around the respective insulators 13. The insulator 13 is made of an insulating material such as a synthetic resin material, and insulates the stator core 12 from the windings 14.

  The stator core 12 is formed by laminating a plurality of electromagnetic steel plates (steel plates obtained by adding silicon to iron) so that a strong magnetic field can be formed. The stator core 12 is provided with a plurality of teeth and slots (not shown) for fixing to the stator housing portion 22. The above-described fixing portion provided in the stator housing portion 22 is formed so as to mesh with the tooth portion and be inserted into the slot.

  The lower insulator 13 is provided with a plurality of press-fitting holes (not shown) into which one of a plurality of terminal pieces 50 each formed of a metal material in a bar shape is press-fitted. Each terminal piece 50 is fixed to the insulator 13 or the main body case 20 so as to protrude downward.

  One end of the winding 14 is tangled on the terminal piece 50, and the winding 14 is fixed by soldering. Each terminal piece 50 is electrically connected to the substrate 30 using a terminal receiver 32 described later. In other words, power is supplied to the driving mechanism 10 from the external power source via the substrate 30.

  A plurality of attachment holes 30 a for attaching the terminal receivers 32 are provided in the substrate 30. Further, the substrate 30 uses terminal pieces 28 and 50 and a terminal receiver 32 to be described later, and a bottom wall (upper wall in the figure) of the substrate storage unit 21 and a back cover 24 that closes the opening of the substrate storage unit 21. Fixed in the middle.

  Various electronic components (not shown) that implement a control circuit (not shown) that controls energization of the winding 14 are mounted on the substrate 30. The control circuit performs energization control on the winding 14 to form a magnetic field (so-called rotating magnetic field) that rotates around the shaft 42. When the rotating magnetic field is formed, each magnet of the impeller 44 and the stator core 12 are attracted or repelled, and the impeller 44 rotates.

  Here, a position detector 31 for detecting the position of the magnet of the impeller 44 is mounted on the upper surface of the substrate 30. For the position detector 31, for example, a non-contact type position sensor or proximity sensor that detects the position of an object (magnet) in a non-contact manner is used.

  The control circuit performs energization control on the winding 14 according to the position of the magnet detected by the position detector 31, and maintains the rotation of the impeller 44 and controls the number of rotations. When the impeller 44 rotates, cooling water is sucked into the pump chamber 64 from the inflow pipe 62, and the cooling water sucked into the pump chamber 64 is sent out from the outflow pipe 63.

  Further, the cooling water sucked into the pump chamber 64 enters between the shaft 42 and the bearing 43, and becomes a lubricant when the bearing 43 rotates with respect to the shaft 42. That is, the pump 2 is a so-called submerged slide bearing pump that uses the circulating cooling water as a lubricant that reduces friction between the shaft 42 and the bearing 43.

  Next, the details of the configuration of the terminal pieces 28 and 50 and the configuration of the terminal receiver 32 will be described. In addition, the part (lower part) connected to the terminal receptacle 32 in the terminal piece 28 and the terminal piece 50 is the same shape, and only the terminal piece 50 is demonstrated below.

  As shown in FIG. 1, the terminal piece 50 has a configuration in which a tip portion (lower end portion in the drawing) is formed in a round bar shape and a barb 51 protruding in the radial direction is provided at the tip portion.

  On the other hand, the terminal receiver 32 includes a receiving portion 33 formed in a cylindrical shape, a fixed portion 34 formed in a cylindrical shape whose central axis coincides with the central axis of the receiving portion 33, and one end of the receiving portion 33. And a positioning portion 35 that connects one end portion (upper end portion in the drawing) of the fixing portion 34 (the upper end portion in the drawing). The positioning unit 35 includes an upper surface that contacts the inner bottom surface of the substrate storage unit 21 or the lower surface of the lower insulator 13. The terminal receiver 32 is formed by squeezing a metal plate, for example.

  From one end portion (lower end portion in the figure) of the outer peripheral surface of the fixing portion 34, a fixing piece 34a for fixing to the substrate 30 protrudes over the entire circumference. When the terminal receiver 32 is inserted into the mounting hole 30 a provided in the substrate 30 from the lower surface side of the substrate 30, the upper surface of the fixed piece 62 a comes into contact with the lower surface of the substrate 30. The terminal receiver 32 is fixed to the substrate 30 by fixing the fixing piece 62 a to the substrate 30 and is electrically connected to a conductor pattern (not shown) provided on the substrate 30.

  As shown in FIG. 5, the length dimension of the fixing portion 34 in the axial direction (vertical direction) is such that the upper surface of the positioning portion 35 contacts the inner bottom surface of the substrate storage portion 21 and the substrate 30 is the bottom wall of the substrate storage portion 21. And the back cover 24. That is, the positioning unit 35 is a positioning unit that determines the vertical position of the substrate 30 with respect to the substrate storage unit 21, and the fixing unit 34 is a spacer that forms a gap between the substrate 30 and the bottom wall of the substrate storage unit 21. It has the function of. It is desirable that the terminal piece 50 be arranged close to the side wall of the stator housing portion 22 so that the positioning portion 35 contacts the inner bottom surface of the substrate housing portion 21. Further, it is desirable that the positioning portion 35 is formed in a shape having a large upper surface area so as to come into contact with the substrate storage portion 21 in a wide area. Further, the vertical position of the substrate 30 can be determined by bringing the positioning portion 35 into contact with the lower surface of the lower insulator 13.

  The receiving portion 33 connected to the fixing portion 34 via the positioning portion 35 has an axial direction (vertical direction) central portion 33a whose inner diameter is set to be substantially the same as the diameter of the central portion of the terminal piece 50 in the axial direction, An upper end portion 33b and a lower end portion 33c sandwiching the central portion 33a up and down are provided. That is, the receiving portion 33 includes an insertion hole into which the terminal pieces 28 and 50 are inserted.

  The upper end portion 33b is formed in a trumpet shape. That is, the terminal receiver 32 includes a guide surface that guides the terminal pieces 28 and 50 as an inner peripheral surface of the upper end portion 33b.

  On the other hand, the lower end portion 33c of the receiving portion 33 is also formed in a trumpet shape, and abuts against the barbs 51 provided at the tip portions of the terminal pieces 28 and 50 to lock the barbs 51. In addition, the lower end portion 33 c of the receiving portion 33 forms a solder pool 36 in which solder accumulates between the tapered end portion of the terminal piece 50.

  Furthermore, as shown in FIG. 6, slits 37 are provided in the central portion 33 a and the upper end portion 33 b of the receiving portion 33 and the fixing portion 34 along the axial direction (vertical direction). The receiving portion 33 can be bent by the slit 37 so as to increase in diameter, and as a result, has elasticity in the radial direction. Since the receiving portion 33 has elasticity in the radial direction, the terminal pieces 28 and 50 having the return 51 can be inserted into the receiving portion 33.

  In assembling the substrate 30 to the main body case 20, the main body case 20 is arranged with the opening side of the substrate storage portion 21 facing upward, and the substrate 30 is inserted into the substrate storage portion 21 of the main body case 20 from above, so that the terminals The tips of the pieces 28 and 50 are brought into contact with the inner peripheral surface (guide surface) of the trumpet-shaped upper end portion 33 b of the receiving portion 33 of the terminal receiver 32. Thereafter, the substrate 30 is pushed into the bottom side of the substrate storage portion 21 (downward), the terminal pieces 28 and 50 are inserted into the receiving portion 33 of the terminal receiver 32, and the return 51 is locked to the lower end portion 33 c of the receiving portion 33. Next, molten solder is poured into the solder pool 36 and fixed to the receiving portion 33 with the terminal pieces 28 and 50.

  When connecting the terminal pieces 28 and 50 to the terminal receiver 32, if the return 51 is fitted to the lower end 33c of the receiving portion 33, the receiving portion 33 deformed by bending returns to the original shape. The operator can know from the hand feeling that the return 51 is fitted into the lower end portion 33c of the receiving portion 33. Accordingly, it is possible to reduce the occurrence of work defects such as insufficient insertion depth of the terminal receiver 32 in the terminal pieces 28 and 50.

  After the terminal pieces 28 and 50 are fixed to the terminal receiver 32 with solder, the back cover 24 is attached to the opening surface of the substrate housing portion 21, and an insulating fluid resin (so-called potting) is applied to the substrate housing portion 21 and the stator. The resin is poured into the storage unit 22 to solidify the resin. By potting, water and dust are prevented from adhering to the electronic components, the terminal pieces 28 and 50 and the terminal receiver 32 mounted on the substrate 30. When the pump 2 is attached to the vehicle body, the back cover 24 side is turned down as described above.

  In the present embodiment, the terminal pieces 28 and 50 can be guided by providing a guide surface on the upper end portion 33 b of the receiving portion 33 of the terminal receiver 32, and the work of assembling the substrate 30 to the main body case 20 can be facilitated. it can.

  Further, due to the radial elasticity applied to the receiving portion 33 by the slit 37, the stress acting on the terminal pieces 28 and 50 when the terminal pieces 28 and 50 are inserted into the terminal receiver 32 can be relieved.

  Furthermore, the terminal pieces 28 and 50 are formed in a round bar shape, and the receiving portion 33 of the terminal receiver 32 is formed in a cylindrical shape, so that the terminal pieces 28 and 50 and the terminal receiver 32 are in contact with each other to ensure a large contact area. In addition, the connection strength can be increased by engaging the return 51 with the lower end portion 33c of the receiving portion 33 and fixing the terminal pieces 28 and 50 to the terminal receiving 32 with solder. Potting can be prevented from entering between the terminal pieces 28, 50 and the terminal receiver 32, and poor conduction between the terminal pieces 28, 50 and the terminal receiver 32 even if vibration or impact is applied to the pump 2 from the vehicle body. Can be prevented.

  Furthermore, the terminal pieces 28 and 50 and the terminal receiver 32 are connected, and the positioning portion 35 of the terminal receiver 32 abuts on the main body case 20, whereby the position of the substrate 30 with respect to the main body case 20 is determined. The detection error of the position of the magnet due to the displacement of the device 31 can be reduced.

  In the above description, the configuration in which the terminal pieces 28 and 50 are formed in a round bar shape has been described, but a configuration in which the terminal pieces 28 and 50 are formed in a bar shape having an elliptical or rectangular cross section perpendicular to the longitudinal direction (vertical direction) is adopted. You can also When this configuration is adopted, the cross-sectional shape of the receiving portion 33 of the terminal receiver 32 is formed in an outer shape of an ellipse or a rectangle according to the cross-sectional shape of the terminal receiver 32.

  Further, as shown in FIG. 7, the root portions 50 a of the terminal pieces 28 and 50 are formed in a divergent shape such that the diameter increases as the distance from the tip ends increases. The contact area between the terminal pieces 28 and 50 and the receiving portion 33 can be increased by contacting the portion 33b. The solder poured into the solder pool 36 passes through the slit 37 and the like and enters the gap between the root portion 50a of the terminal pieces 28 and 50 and the upper end portion 33b of the receiving portion 33, and the upper end portion 33b and the root portion of the terminal receiver 32. 50a is fixed. Therefore, a larger contact area can be secured and the connection strength between the terminal pieces 28 and 50 and the terminal receiver 32 can be further increased.

  In the present embodiment, the example in which the technique of the present invention is used for the motor 1 used for the pump 2 of the liquid circulation device 3 that is a cooling device has been described. For example, a hot water circulation device for heating the interior of the vehicle when idling is stopped. The technology of the present invention can also be used for the motor of the pump used in the above. The technique of the present invention can also be applied to a motor other than a motor mounted on a vehicle, such as a pump motor used in a hot water supply apparatus that supplies hot water. Furthermore, the technology of the present invention can be used for various motors that supply power to the drive circuit via the substrate.

(Embodiment 2)
In the present embodiment, a configuration in which an engagement portion is provided in the terminal receiver 32 and an engaged portion that engages with the engagement portion is provided in the main body case 20 and the lower insulator 13 will be described. Other configurations of the present embodiment are the same as the configurations of the first embodiment.

  As shown in FIG. 8, at the upper end of the outer peripheral surface of the fixing portion 34 of the terminal receiver 32, an engaging convex portion 38 is provided as an engaging portion over the entire circumference in the circumferential direction. The engaging convex portion 38 is formed in a ring shape whose upper surface is flush with the upper surface of the positioning portion 35.

  On the other hand, an engagement protrusion 39 is provided as an engaged portion on the inner bottom surface of the substrate housing portion 21 of the main body case 20 and the lower surface of the lower insulator 13. The engagement protrusion 39 is provided so as to surround the terminal pieces 28 and 50. Specifically, the two engaging protrusions 39 arranged so that the terminal pieces 28 and 50 are located between them are used as a pair of engaging protrusions 39, and a plurality of pairs of engaging protrusions 39 are connected to the terminal pieces 28 and 50. Provide around. Each engagement protrusion 39 is directed from the inner bottom surface of the substrate storage portion 21 or the lower surface of the lower insulator 13 to the terminal pieces 28 and 50 from the distal end portion (lower end portion in the drawing) of the base portion 39a. And an engaging claw 39b projecting from each other.

  The engagement protrusion 39 is formed integrally with the main body case 20 or the lower insulator 13. That is, the engaging claw 39b of the engaging protrusion 39 is made of a synthetic resin material and has flexibility in the thickness direction (vertical direction).

  Here, the distance between the tips of the two engaging claws 39 b of the pair of engaging protrusions 39 is set smaller than the diameter of the engaging convex portion 38. The dimension between the upper surface of the engaging claw 39b and the inner bottom surface of the substrate storage part 21 or the lower surface of the lower insulator 13 is set to be larger than the vertical thickness of the engaging convex part 38. Furthermore, the dimension between the opposing surfaces of the base portions 39 a of the pair of engaging protrusions 39 is set larger than the diameter of the engaging convex portion 38.

  Therefore, when the terminal pieces 28 and 50 are inserted into the terminal receiver 32 and the engaging convex portion 38 is brought into contact with the engaging claw 39b of the engaging projection 39, the engaging claw 39b is bent upward and the engaging convex portion 38 is formed. It fits between the engaging protrusions 39. That is, when the terminal pieces 28, 50 are connected to the terminal receiver 32, the engaging convex portion 38 is locked to the engaging protrusion 39, and together with the barbs 51 provided on the terminal pieces 28, 50, the terminal pieces 28, 50 are prevented from coming off. It can be performed.

  By the way, it is known that the above-mentioned potting filled in the main body case 20 expands or contracts due to a change in ambient temperature. As the potting expands or contracts, the substrate 30 tends to move or deform in the vertical direction or in the direction along the surface (the horizontal direction in the figure). Further, the substrate 30 tends to move or be deformed by vibration or impact from the vehicle body.

  In the present embodiment, in addition to the connection between the terminal pieces 28 and 50 and the terminal receiver 32, the engagement protrusion 39 and the engagement protrusion 38 are engaged, so that the movement and deformation of the substrate 30 can be prevented. Further, when the movement and deformation of the substrate 30 are prevented, the stress acting on the terminal pieces 28 and 50 due to the engagement between the engaging portion and the engaged portion can be reduced.

  Further, when the terminal pieces 28 and 50 are inserted into the terminal receiver 32, the engaging protrusion 38 and the engaging protrusion 39 engage with each other, so that the operator can confirm that the mounting position of the substrate 30 is correct. This can be confirmed by the feeling received by the hand when 38 and the engagement protrusion 39 are engaged, and the assembly failure of the substrate 30 can be eliminated.

  In the above-described configuration, the example in which the base portions 39a of the plurality of engagement protrusions 39 surrounding the terminal pieces 28 and 50 are separated from each other has been described. However, all of the plurality of pairs of engagement protrusions 39 provided around the terminal pieces 28 and 50 are described. Is preferably provided only on one of the substrate storage portion 21 and the lower insulator 13, it is desirable to employ a configuration in which the base portions 39 a are connected to each other. When this configuration is adopted, even if the solder flows along the terminal pieces 28 and 50 and flows into the inner bottom surface of the substrate storage portion 21 or the lower surface of the lower insulator 13, the spread of the solder can be prevented by the base portion 39a.

  Further, the engagement protrusion 39 can be provided around a terminal piece (terminal piece 28 or terminal piece 50) selected from the plurality of terminal pieces 28, 50. However, it is desirable to provide the engaging protrusions 39 around at least two terminal pieces (terminal piece 28 or terminal piece 50).

DESCRIPTION OF SYMBOLS 1 Motor 2 Pump 3 Liquid circulation apparatus 10 Drive mechanism 20 Main body case 28 Terminal piece 30 Board | substrate 32 Terminal receiver 33 Receiving part 33a Center part 33b Upper end part 33c Lower end part 35 Positioning part (positioning means)
36 Solder pool 37 Slit 38 Engaging convex part (engaging part)
39 Engagement protrusion (engaged part)
50 Terminal piece 50a Root part 51 Return 62 Inflow pipe 63 Outflow pipe 64 Pump chamber 76 Circulation pipe

Claims (6)

  A main body case, a drive mechanism disposed at a fixed position of the main body case, a substrate housed in the main body case and electrically connected to an external power source, and fixed at a fixed position relative to the main body case and electrically connected to the drive mechanism A motor having a connected terminal piece and a terminal receiver attached to a substrate, each terminal piece is formed in a bar shape with a barb at the tip, and each terminal receiver has a terminal piece It has an insertion hole to be inserted and has elasticity in a direction intersecting the mouth axis direction of the insertion hole, and the peripheral wall of the insertion hole has a central portion in the mouth axis direction where the peripheral surface of the terminal piece abuts, and the mouth axis direction And both end portions sandwiching the central portion, one of the both end portions is provided with a guide surface that guides the distal end portion of the terminal piece to the central portion, the other is to lock the return provided on the terminal piece, Solder accumulates between the terminal pieces. Motor and forming a solder reservoir.   The motor according to claim 1, wherein the terminal piece includes a root portion that abuts against a guide surface of the terminal receiver.   3. The motor according to claim 1, wherein the terminal receiver includes positioning means that comes into contact with one of the main body case and the drive mechanism in a mouth axis direction of the insertion hole.   The terminal receiver includes an engaging portion, and at least one of the main body case and the driving mechanism includes an engaged portion that engages with the engaging portion. The motor according to any one of claims.   An inflow pipe that includes the motor according to any one of claims 1 to 4 and a pump chamber that houses an impeller rotated by the motor, and that allows fluid to flow into the pump chamber on a wall of the pump chamber. And a pump having an outflow pipe projecting out the fluid flowing into the pump chamber.   6. A liquid circulation device comprising: the pump according to claim 5; and a circulation pipe connected to the inflow pipe and the outflow pipe.

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