Motor device and oil pump device

Abstract

The invention provides a motor device and an oil pump device which can improve the heat discharge efficiency of heat discharged from a control circuit without increasing the size of the motor device. The motor device includes: an electric motor; a control board on which a control circuit for controlling the electric motor is mounted; a metal housing that supports the first surface of the control substrate; a resin cover attached to the housing so as to cover a second surface of the control substrate on the opposite side from the first surface and the periphery of the control substrate; and a heat dissipation member that dissipates heat generated by a heat generating element included in the control circuit to the housing. The heat dissipation member includes: a heat receiving plate fixed to the cover; and a heat transfer plate protruding toward the housing. The housing includes, on an outer side of the motor accommodating space, a receiving portion that receives a protruding end of the heat transfer plate inserted in an extending direction of the rotating shaft; and a heat discharge wall extending in the extending direction of the rotating shaft and in surface contact with the heat transfer plate received by the receiving portion.

Description

Technical Field

[0001] The present invention relates to a motor device and an oil pump device equipped with the motor device. Background Art

[0002] In recent years, efforts have been made to promote the Sustainable Development Goals (2030 Agenda for Sustainable Development, adopted by the United Nations Summit on September 25, 2015, hereinafter referred to as "SDGs"). In line with this, technologies are known that aim to prevent and reduce waste, and to significantly reduce waste generation through the recycling and reuse of products in order to ensure sustainable production and consumption patterns.

[0003] Conventionally, there is known a so-called "mechatronic" motor device in which an electric motor and a control substrate for controlling the electric motor are accommodated in a housing and integrated. In addition, such a motor device is provided with a heat sink, which dissipates heat from a control circuit mounted on the control substrate via the housing.

[0004] For example, Patent Document 1 discloses a motor device in which a heat sink is fixed to the outside of a motor housing space of a housing by bolts. More specifically, in the heat sink of Patent Document 1, one surface in the thickness direction is in surface contact with a control substrate, and the other surface in the thickness direction is in surface contact with a mounting surface of the housing that is orthogonal to the rotation axis of the motor.

[0005] [Prior art literature]

[0006] [Patent Document]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 2021-136825 Summary of the invention

[0008] [Problems to be solved by the invention]

[0009] However, since there is little space outside the motor housing space of the housing, it is difficult to ensure a large mounting surface. As a result, the contact area between the radiator and the housing cannot be increased, so it is difficult to improve the heat dissipation efficiency. On the other hand, in order to improve the heat dissipation efficiency in the motor device of Patent Document 1, it is necessary to enlarge the motor device in the radial direction.

[0010] Therefore, an object of the present invention is to provide a technology for improving the heat removal efficiency of heat released from a control circuit without increasing the size of a motor device.

[0011] [Technical means to solve the problem]

[0012] To achieve the above object, the present invention is a motor device, comprising: an electric motor; a control substrate on which a control circuit for controlling the electric motor is mounted; a metal housing having a motor housing space for housing the electric motor and supporting a first surface of the control substrate at a position offset from the motor housing space in a direction in which a rotating shaft of the electric motor is extended; a resin cover mounted on the housing in a manner covering a second surface of the control substrate opposite to the first surface and the periphery of the control substrate; and a heat dissipation member for dissipating heat generated by a heating element included in the control circuit to the housing, wherein the heat dissipation member comprises: a heat receiving plate fixed to the cover at a position facing the heating element; and a heat transfer plate protruding from the heat receiving plate toward the housing at a position offset from the control substrate, the housing comprising, on the outside of the motor housing space: a receiving portion for receiving a protruding end of the heat transfer plate inserted in the direction in which the rotating shaft is extended; and a heat exhaust wall extending in the direction in which the rotating shaft is extended and in surface contact with the heat transfer plate received by the receiving portion.

[0013] [Effects of the Invention]

[0014] According to the present invention, the heat removal efficiency of the heat released from the control circuit can be improved without increasing the size of the motor device. Other problems, structures and effects will become clear from the following description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an external perspective view of the oil pump device according to the present embodiment.

[0016] Figure 2 This is an exploded perspective view of the control unit.

[0017] Figure 3 This is a perspective view of the control unit with the cover removed.

[0018] Figure 4A and Figure 4B It is a three-dimensional diagram of the radiator.

[0019] Figure 5 This is a perspective view of the cover as viewed from the back side.

[0020] Fig. 6A is a cross-sectional view showing the protruding end of the heat transfer plate before being inserted into the groove of the radiator support portion. Figure 6B It is a cross-sectional view showing a state in which the protruding end of the heat transfer plate is inserted into the groove of the heat sink support portion.

[0021] Figure 7 This is a cross-sectional view showing the positional relationship among the heat sink support portion, the control substrate, and the heat sink.

[0022] [Explanation of Symbols]

[0023] 1: Oil pump device

[0024] 2: Motor

[0025] 3: Control Department

[0026] 4: Pump

[0027] 5: Motor device

[0028] 6: Electric Motor

[0029] 7: Rotation axis

[0030] 10: Shell

[0031] 11: Motor storage space

[0032] 12: Support surface

[0033] 13: Support protrusion

[0034] 14: Screw seat

[0035] 15: Radiator support

[0036] 15a: Base

[0037] 15b: Heat exhaust wall

[0038] 15c: Facing walls

[0039] 15d: Groove

[0040] 16: Second positioning hole

[0041] 17: Screw hole

[0042] 18: Screw

[0043] 20: Control board

[0044] 21: Substrate

[0045] 21a: Side 1

[0046] 21b: Side 2

[0047] 22: First positioning hole

[0048] 23: Control circuit

[0049] 24: Substrate storage space

[0050] 30: Connector unit

[0051] 40: Relay unit

[0052] 50: Radiator

[0053] 51: Heating plate

[0054] 52: Heat transfer plate

[0055] 53: Overhang

[0056] 54: Slit

[0057] 55: Coolant

[0058] 60: Hood

[0059] 61: Top wall

[0060] 62: Sidewall

[0061] 64: Positioning pin

[0062] 65: Screw hole DETAILED DESCRIPTION

[0063] Hereinafter, an oil pump device 1 according to an embodiment of the present invention will be described with reference to the drawings. Figure 1 It is an external perspective view of the oil pump device 1 according to the present embodiment.

[0064] The oil pump device 1 of the present embodiment supplies oil (for example, lubricating oil) to, for example, an engine clutch or a transmission clutch mounted in an automobile. However, the use of the oil pump device 1 is not limited thereto.

[0065] like Figure 1 As shown, the oil pump device 1 is a so-called "electric oil pump" including a motor unit 2, a control unit 3, and a pump unit 4. In addition, the motor unit 2 and the control unit 3 independently form a so-called "mechanically integrated" motor device 5 with the pump unit 4. In addition, the motor device 5 is not limited to driving the pump unit 4, and can also drive a cooling fan or a wiper.

[0066] The motor unit 2 includes an electric motor 6 (see FIG. 1 ) which is rotated (generates driving force) by driving power supplied from the control unit 3. Figure 7 ). The specific example of the electric motor 6 is not particularly limited, but for example, an inner rotor type brushless motor may be used. The structure of the electric motor 6 is well known, so a detailed description is omitted. The control unit 3 supplies the electric power supplied from an external device (not shown) as driving power to the electric motor 6. For the specific structure of the control unit 3, refer to Figure 2 The pump unit 4 receives the driving force of the motor unit 2 and pumps the oil under pressure. The structure of the pump unit 4 is well known, so the detailed description is omitted.

[0067] The motor unit 2, the control unit 3, and the pump unit 4 are connected to a rotating shaft 7 (see Figure 7More specifically, for the motor unit 2 arranged in the center, the control unit 3 is arranged adjacent to one side of the extending direction of the rotating shaft 7, and the pump unit 4 is arranged adjacent to the other side of the extending direction of the rotating shaft 7.

[0068] The oil pump device 1 includes a housing 10 that accommodates a motor unit 2, a control unit 3, and a pump unit 4. The housing 10 is made of a metal material such as die-cast aluminum. In addition, the housing 10 is not limited to an integrated type that collectively accommodates the motor unit 2, the control unit 3, and the pump unit 4, but may also be partially divided.

[0069] Figure 2 It is an exploded perspective view of the control unit 3 . Figure 3 FIG. 2 is a perspective view of the control unit 3 with the cover 60 removed. Figure 2 and Figure 3 As shown, the control unit 3 mainly includes a housing 10, a control substrate 20, a connector unit 30, a relay unit 40, a heat sink 50, and a cover 60. Hereinafter, the extending direction of the rotating shaft 7 is simply expressed as "axial direction", and the direction orthogonal to the extending direction of the rotating shaft 7 (radial direction of the rotating shaft 7) is simply expressed as "radial direction".

[0070] like Figure 2 As shown, a motor housing space 11 for housing the electric motor 6 is formed in the housing 10. The motor housing space 11 is a space with a substantially cylindrical outer shape. In addition, the housing 10 has a support surface 12 for supporting the components (20 to 60) of the control unit 3. The support surface 12 is a surface extending radially at a position offset axially from the motor housing space 11. The support surface 12 has a substantially quadrilateral outer shape when viewed from the axial direction.

[0071] The support surface 12 is provided with a plurality of (four in this embodiment) support protrusions 13 a , 13 b , 13 c , and 13 d , a plurality of (four in this embodiment) screw seats 14 a , 14 b , 14 c , and 14 d , and a heat sink support portion 15 .

[0072] The support protrusions 13a to 13d protrude axially from the support surface 12 at different positions (typically, positions surrounding the motor housing space 11) of the support surface 12. The support protrusions 13a to 13d support the control substrate 20 with their front ends. In addition, the support protrusions 13a to 13d are formed with second positioning holes 16a, 16b, 16c, and 16d for receiving positioning pins 64a to 64d described later. The second positioning holes 16a to 16d extend from the front ends of the support protrusions 13a to 13d toward the base ends.

[0073] The screw seats 14a to 14d protrude axially from the support surface 12 at different positions (typically, positions surrounding the motor housing space 11) of the support surface 12. The screw seats 14a to 14d are formed with screw holes 17a, 17b, 17c, and 17d that communicate with the screw holes 65a to 65d of the cover 60 when the cover 60 is mounted on the housing 10. The cover 60 is fixed to the housing 10 by screwing the screws 18a to 18d into the communicating screw holes 17a to 17d and the screw holes 65a to 65d.

[0074] The radiator support portion 15 supports the end of the radiator 50. The radiator support portion 15 is provided at a position radially offset from the motor housing space 11. In addition, the radiator support portion 15 is provided linearly parallel to one of the four sides constituting the outer edge of the support surface 12 at a position adjacent to the side. For the specific structure of the radiator support portion 15, refer to Fig. 6A and Figure 6B Described later.

[0075] The control board 20 includes a board 21. The board 21 is a flat plate-shaped member having a substantially quadrilateral outer shape. The board 21 includes a first surface 21a and a second surface 21b (see Figure 7 The first surface 21a is a surface on one side of the thickness direction of the substrate 21 (the side facing the motor housing space 11). The second surface 21b is a surface on the other side of the thickness direction of the substrate 21 (the side opposite to the first surface 21a). Fig. 6A and Figure 6B As shown, the substrate 21 is arranged so as to overlap with the motor housing space 11 when viewed from the axial direction. In addition, the outer edge of the substrate 21 is located outside the motor housing space 11 when viewed from the axial direction.

[0076] The substrate 21 is formed with a first positioning hole 22a, a first positioning hole 22b, a first positioning hole 22c, and a first positioning hole 22d that penetrate in the thickness direction. The first positioning holes 22a to 22d are formed at the outer edge of the substrate 21 at positions corresponding to the support protrusions 13a to 13d. Furthermore, when the substrate 21 is supported by the front ends of the support protrusions 13a to 13d, the corresponding first positioning holes 22a to 22d and the second positioning holes 16a to 16d are connected. Furthermore, when the positioning pins 64a to 64d are inserted into the corresponding first positioning holes 22a to 22d and the second positioning holes 16a to 16d, the housing 10, the control substrate 20, and the cover 60 are positioned.

[0077] A plurality of circuit elements 23a and 23b constituting a control circuit 23 for controlling the electric motor 6 are mounted on one or both of the first surface 21a and the second surface 21b of the substrate 21. In addition, at least a portion of the circuit elements 23a and 23b (for example, the circuit element 23b) is a heating element that generates a large amount of heat. The circuit element 23b is located on the side (ie, the side) on which the connector unit 30 is disposed, among the four sides constituting the outer edge of the substrate 21. Figure 3 The right side) and the side for the relay unit 40 to be configured ( Figure 3 The top side) different sides ( Figure 3 ) is installed on the second surface 21b of the substrate 21 near the left side of the substrate 21.

[0078] The connector unit 30 connects the external device to the control circuit 23. The connector unit 30 includes: a pair of power lines for supplying the driving power output from the external device to the control circuit 23; and a pair of signal lines for sending and receiving control signals between the external device and the control circuit 23. The connector unit 30 is accommodated in the connector holder 63 of the cover 60. The connector unit 30 is embedded and integrally formed, for example, when the cover 60 is injection molded. The relay unit 40 connects the control circuit 23 to the electric motor 6 (more specifically, the coil). The relay unit 40 supplies the driving power output from the control circuit 23 to the coil. As a result, the electric motor 6 rotates.

[0079] Figure 4A and Figure 4B : is a perspective view of the heat sink 50. The heat sink 50 is a heat sink member that dissipates heat generated by the circuit element 23b to the housing 10. The heat sink 50 is formed of a metal material with high thermal conductivity (for example, copper). In addition, the heat sink 50 is formed into a Figure 4A and Figure 4B Shape shown.

[0080] like Figure 4A and Figure 4B As shown, the heat sink 50 includes a heat receiving plate 51 and a heat transfer plate 52. The heat sink 50 is bent in a manner that the heat receiving plate 51 and the heat transfer plate 52 intersect (orthogonally). That is, the heat sink 50 has a substantially L-shaped appearance. In addition, the protruding end 53 (the end on the opposite side to the heat receiving plate 51) of the heat transfer plate 52 is bent into a U-shape (or a J-shape) by folding the front end of the heat transfer plate 52 toward the heat receiving plate 51. Furthermore, a slit 54 extending from the protruding end 53 toward the heat receiving plate 51 is formed in the heat transfer plate 52.

[0081] Figure 5 The cover 60 is a three-dimensional view obtained by observing the cover 60 from the back side. The cover 60 is integrally formed by injection molding a resin material, for example. That is, the cover 60 is formed of a material having a lower thermal conductivity than the housing 10 and being lighter than the housing 10. Figure 2and Figure 5 As shown, the cover 60 mainly includes a top wall 61, a side wall 62, a connector holder 63, and a plurality of positioning pins 64a, 64b, 64c, and 64d.

[0082] The top wall 61 is a portion covering the second surface 21b of the control substrate 20 (substrate 21). When the cover 60 is mounted on the housing 10, the top wall 61 is spaced apart from the control substrate 20 by a predetermined interval in the axial direction and faces the second surface 21b. In addition, the heat receiving plate 51 of the radiator 50 is mounted on the surface (back surface) of the top wall 61 facing the second surface 21b. The heat receiving plate 51 can be mounted on the top wall 61 by, for example, heat riveting, or can be embedded when the cover 60 is injection molded. Furthermore, screw holes 65a, 65b, 65c, and 65d are formed at the four corners of the top wall 61 and penetrate in the thickness direction.

[0083] The side wall 62 is a frame-shaped portion covering the periphery of the control substrate 20. The side wall 62 protrudes from the outer edge of the top wall 61 toward the housing 10 (i.e., in the axial direction). When the housing 10 is mounted on the cover 60, the front end of the side wall 62 abuts against the support surface 12 of the housing 10. Thus, a substrate accommodating space 24 for accommodating the control substrate 20 is formed between the housing 10 and the cover 60 (more specifically, the support surface 12, the top wall 61, and the side wall 62). The connector holder 63 is provided on the outside of the side wall 62 to hold the connector unit 30.

[0084] The positioning pins 64a to 64d protrude axially from the back surface of the top wall 61 on the inner side of the side wall 62. When the positioning pins 64a to 64d are inserted into the first positioning holes 22a to 22d, the control substrate 20 is mounted on the cover 60 with the second surface 21b facing the top wall 61. When the positioning pins 64a to 64d are inserted into the second positioning holes 16a to 16d in this state, the threaded holes 17a to 17d and the threaded holes 65a to 65d are connected, and as described later, the protruding end 53 of the heat transfer plate 52 is inserted into the groove 15d of the radiator support portion 15 in the axial direction. Then, the cover 60 is fixed to the case 10 by screwing the screws 18a to 18d into the communicating screw holes 17a to 17d and the screw holes 65a to 65d, with the case 10, the control board 20, the heat sink 50 and the cover 60 positioned.

[0085] Fig. 6A 1 is a cross-sectional view showing the state before the protruding end 53 of the heat transfer plate 52 is inserted into the groove 15d of the heat sink support portion 15. Figure 6B 15 is a cross-sectional view showing a state in which the protruding end 53 of the heat transfer plate 52 is inserted into the groove 15 d of the heat sink support portion 15 . Figure 7It is a cross-sectional view showing the positional relationship among the heat sink support portion 15 , the control substrate 20 , and the heat sink 50 .

[0086] like Fig. 6A and Figure 6B and Figure 7 As shown, the radiator support portion 15 includes a base 15a, a heat dissipation wall 15b, and an opposing wall 15c. The base 15a is a portion supported by the support surface 12. The heat dissipation wall 15b and the opposing wall 15c are extended from the base 15a in the axial direction (i.e., toward the cover 60) at a predetermined interval in the thickness direction of the heat transfer plate 52. In addition, the base 15a, the heat dissipation wall 15b, and the opposing wall 15c are extended along the support surface 12 in the width direction of the heat transfer plate 52.

[0087] Furthermore, the base 15a, the heat exhaust wall 15b, and the facing wall 15c define a groove 15d. The groove 15d is an example of a receiving portion for receiving the protruding end 53 of the heat transfer plate 52 inserted in the axial direction. The groove 15d extends linearly on the support surface 12 in a direction perpendicular to the thickness direction of the heat transfer plate 52. However, the shape of the groove 15d is not limited thereto, and may be curved along the outer periphery of the motor housing space 11.

[0088] like Fig. 6A As shown, the diameter D1 of the curved protruding end 53 in its natural state is larger than the width dimension D2 of the groove 15d. Here, the so-called natural state of the protruding end 53 is a state where no external force other than gravity is applied (typically, the state before being inserted into the groove 15d). In addition, the width dimension D2 of the groove 15d is equivalent to the distance between the heat exhaust wall 15b and the facing wall 15c. Moreover, as Figure 6B As shown, the bent protruding end 53 is inserted into the groove 15d in a state of being elastically shrunken. When the protruding end 53 is inserted into the groove 15d, the heat transfer plate 52 is in surface contact with the heat exhaust wall 15b.

[0089] like Figure 7 As shown, the heat receiving plate 51 is spaced apart from the second surface 21b of the control substrate 20 (more specifically, the circuit element 23b) at a predetermined interval in the axial direction. In other words, the heat receiving plate 51 and the control substrate 20 are spaced apart from each other in the axial direction and arranged in parallel. In addition, a heat sink 55 is interposed between the heat receiving plate 51 and the circuit element 23b. In other words, the heat receiving plate 51 is connected to the circuit element 23b via the heat sink. The heat sink 55 includes, for example, a thermosetting resin with high thermal conductivity.

[0090] In addition, if Figure 7As shown in FIG. 1 , the heat transfer plate 52 protrudes from the heat receiving plate 51 toward the housing 10 (more specifically, the radiator support portion 15) at a position offset from the control substrate 20. More specifically, the heat transfer plate 52 is located adjacent to the edge ( Figure 2 The slit 54 faces the left side of the heat dissipation wall 15b and protrudes toward the housing 10. Furthermore, the slit 54 extends to a position closer to the heat receiving plate 51 than the heat dissipation wall 15b.

[0091] According to the above-described embodiment, for example, the following effects are achieved.

[0092] According to the embodiment, the heat exhaust wall 15b extending in the axial direction is in surface contact with the heat transfer plate 52, and the heat generated by the circuit element 23b is dissipated to the housing 10. Here, the axial dimension of the substrate accommodating space 24 originally has a margin corresponding to the height of the circuit elements 23a and 23b mounted on the substrate 21 and the height of the support protrusions 13a to 13d, so it is easy to increase the contact area between the heat exhaust wall 15b and the heat transfer plate 52.

[0093] As a result, compared with Patent Document 1, the heat removal efficiency of the heat released from the control circuit 23 can be improved without increasing the size of the oil pump device 1 (motor device 5). As a result, the degradation of the control circuit 23 caused by heat is suppressed, which helps to extend the life of the oil pump device 1 (motor device 5) and prevent the generation of waste. Furthermore, by adopting the resin cover 60, the oil pump device 1 can be made lighter than a metal cover, so it can contribute to carbon neutrality.

[0094] In addition, according to the above embodiment, the protruding end 53 of the heat transfer plate 52 is curved to prevent the protruding end 53 from being caught when entering the groove 15d. As a result, the heat sink 50 (in other words, the cover 60) can be smoothly mounted on the housing 10. However, the shape of the protruding end 53 is not limited to the curved shape.

[0095] In addition, according to the embodiment, the diameter D1 of the protruding end 53 in the natural state is made larger than the width D2 of the groove 15d, and the protruding end 53 is inserted into the groove 15d while elastically shrinking the diameter. As a result, the heat transfer plate 52 is in close contact with the heat exhaust wall 15b due to the elastic recovery force of the protruding end 53, so the heat exhaust efficiency is further improved. However, the relationship between D1 and D2 is not limited to the example described above.

[0096] In addition, according to the embodiment, by providing the slits 54 in the heat transfer plate 52, the elastic deformation ability of the heat transfer plate 52 is improved. As a result, the heat transfer plate 52 supported by the radiator support portion 15 in an elastically deformed state is in close contact with the heat exhaust wall 15b by the force of elastic recovery, so the heat exhaust efficiency is further improved. In addition, the heat transfer plate 52 can be elastically deformed to absorb the manufacturing error or assembly error of the radiator support portion 15, the radiator 50 and the cover 60. In addition, the shape, position, number, and width of the slits 54 can be appropriately selected according to the raw material or thickness of the radiator 50. In addition, the slits 54 can be omitted.

[0097] In addition, according to the embodiment, the heat sink 50 can be miniaturized by providing a heat transfer plate 52 on the side closest to the circuit element 23b that generates a lot of heat among the multiple sides that define the outer edge of the control substrate 20. As a result, the heat transfer path from the circuit element 23b to the heat sink support portion 15 is shortened, thereby further improving the heat dissipation efficiency. However, the configuration of the heat transfer plate 52 is not limited to the example described above. As another example, a heat transfer plate 52 extending from the heat receiving plate 51 in different directions (for example, Figure 2 A plurality of heat transfer plates 52 extending to the left and bottom of the body.

[0098] Furthermore, according to the embodiment, by making the heat receiving plate 51 contact the circuit element 23b mounted on the second surface 21b via the heat dissipating agent 55, the heat removal efficiency is further improved compared with the case where a substrate is interposed between the heat generating element and the heat sink as in Patent Document 1. However, the positional relationship between the circuit element 23b and the heat receiving plate 51 is not limited to the example described above.

[0099] The above is a description of the embodiments of the present invention. In addition, the present invention is not limited to the embodiments, but also includes various modifications. For example, the embodiments are described in detail to explain the present invention in an easy-to-understand manner, and are not necessarily limited to the embodiments including all the structures described. In addition, a part of the structure of the present embodiment can be replaced with the structure of other embodiments, and the structure of other embodiments can be added to the structure of the present embodiment. In addition, other structures can be added, deleted, or replaced with a part of the structure of the present embodiment.

Claims

1. A motor device, comprising: Electric motor; A control substrate having a control circuit installed thereon for controlling the electric motor; a metal housing having a motor housing space for housing the electric motor and supporting the first surface of the control substrate at a position offset from the motor housing space in a direction in which a rotating shaft of the electric motor extends; a resin cover mounted on the housing so as to cover a second surface of the control substrate opposite to the first surface and a periphery of the control substrate; as well as The heat dissipation member dissipates heat generated by the heating element included in the control circuit to the housing, wherein the motor device is characterized in that: The heat dissipation component comprises: a heat receiving plate fixed to the cover at a position facing the heating element; and a heat transfer plate protruding from the heat receiving plate toward the housing at a position offset from the control substrate, The housing includes, outside the motor accommodating space: a receiving portion for receiving a protruding end of the heat transfer plate inserted along an extending direction of the rotating shaft; and The heat exhaust wall is extended along the extending direction of the rotating shaft and is in surface contact with the heat transfer plate received by the receiving portion.

2. The motor device according to claim 1, characterized in that: The protruding end is bent by folding the front end of the heat transfer plate toward the heat receiving plate.

3. The motor device according to claim 2, characterized in that: The receiving portion is a groove defined by the heat exhaust wall at one end in the width direction. The bent protruding end has a diameter greater than a width of the groove in a natural state, and is inserted into the groove in a state of being elastically reduced in diameter.

4. The motor device according to claim 1, characterized in that: The heat transfer plate is formed with a slit extending from the protruding end to a position closer to the heat receiving plate than the heat exhaust wall.

5. The motor device according to claim 1, characterized in that: The heat transfer plate faces a side closest to the heat generating element among a plurality of sides defining an outer edge of the control substrate, and protrudes toward the housing.

6. The motor device according to claim 1, characterized in that: The heating element is mounted on the second surface of the control substrate. The heat receiving plate is connected to the heating element via a heat dissipating agent.

7. An oil pump device, characterized in that: include: The motor device as claimed in claim 1; as well as The pump unit pumps oil under pressure using the driving force of the electric motor.

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