Motor device

Abstract

Provided is a motor device (1) wherein an inner part (42) of a connector unit (41) has a base surface (421a) that faces an inner surface (521a) of an end wall part (52) of a housing (22, 51) and an inner wall surface (422a) that extends in a first direction from an outer edge of the base surface. A connection part (44) of the connector unit has a connection surface (44a) that extends in a second direction from an inner edge of the base surface and that faces an opening edge surface (54a) of an opening (54) of the housing. The end wall part of the housing includes, in a portion between the opening and the peripheral wall part (53), an extension part (55) which has an extension surface (55a) that faces the inner wall surface. A gap between the connection surface and the opening edge surface forms a first passage (801), a gap between the inner wall surface and the extension surface forms a second passage (802), and a gap between the base surface and the inner surface of the end wall part forms a third passage (803). At least the first passage and the third passage are filled with a sealing adhesive (701), and the width of the first passage is greater than the width of the second passage.

Description

Motor device

[0001] The present disclosure relates to a motor device.

[0002] For example, the motor device disclosed in Patent Document 1 includes a motor, a circuit board, and a connector unit attached to the circuit board. The motor device further includes a motor housing and a cover. The motor housing and the cover accommodate the motor, the circuit board, and the connector unit inside the motor device. The connector unit has a connector portion exposed to the outside of the motor device, and an inner portion accommodated inside the motor device. The connector portion is exposed to the outside of the motor device via an opening provided in the cover. A gap between the connector unit and an inner edge of the opening is sealed by filling with an adhesive.

[0003] Japanese Unexamined Patent Publication No. 2020-28159

[0004] In the motor device as described above, in order to improve the reliability of the seal, it is effective to cause the adhesive filled in the gap between the connector unit and the inner edge of the opening to ooze out from the gap to the outside of the motor device.

[0005] A motor device according to one aspect of the present disclosure comprises a motor having a rotating shaft, a circuit board for controlling the operation of the motor, a housing for housing the motor and the circuit board, and a connector unit housed inside the housing with a portion of it exposed to the outside of the housing. The housing has an opening that penetrates in the axial direction of the rotating shaft, and has an end wall portion extending radially in the direction of the rotating shaft, and a circumferential wall portion extending from the periphery of the end wall portion in a first direction along the axial direction. The connector unit has a connector portion exposed to the outside of the housing through the opening so as to extend in a second direction opposite to the first direction, an inner portion housed inside the housing, and a connecting portion that connects the connector portion and the inner portion in the axial direction. The inner portion has a base surface facing the inner surface of the end wall portion in the axial direction, and an inner wall surface extending from the outer edge of the base surface in a first direction and facing radially. The connecting portion extends from the inner edge of the base surface in the second direction and has a connecting surface facing the opening edge surface of the opening. The end wall portion is an extended portion provided between the opening and the peripheral wall portion, and includes an extended portion that extends from the inner surface of the end wall portion in the first direction and has an extended surface facing the inner wall surface. The gap between the connecting surface and the opening edge surface forms a first passage extending in the axial direction to communicate with the outside of the housing, the gap between the inner wall surface and the extended surface forms a second passage extending in the axial direction to communicate with the inside of the housing, and the gap between the base surface and the inner surface of the end wall portion forms a third passage extending in the radial direction to connect the first passage and the second passage. Of the first passage, the second passage and the third passage, at least the first passage and the third passage are filled with a sealing adhesive. The width of the first passage is greater than the width of the second passage.

[0006] This is an exploded perspective view of the motor device according to the first embodiment. This is a plan view of the motor device of Figure 1. This is a perspective view of the cover of Figure 1. This is a perspective view of the cover of Figure 1. This is an end view of the line V-V in Figure 2. This is a schematic diagram showing an enlarged structure of section VI of Figure 5. This is a schematic diagram showing the process of attaching the cover to the motor housing with the motor, first circuit board, second circuit board, and connector unit attached. This is a schematic diagram showing the configuration of the motor device according to the second embodiment.

[0007] <First Embodiment> The first embodiment of the motor device will be described below with reference to the drawings. As shown in Figure 1, the motor device 1 is mounted, for example, on an electric power steering system in a vehicle. The motor device 1 is a mechatronic integrated motor device in which a motor 11, a first circuit board 31, a second circuit board 32, and a connector unit 41 are integrated. The first circuit board 31 and the second circuit board 32 control the drive of the motor 11, which is the object to be controlled. The motor 11 outputs motor torque through the rotating shaft 12 to operate the electric power steering system. The motor device 1 employs a so-called dual-system redundant system that drives the motor 11 using, for example, two systems, a first system and a second system.

[0008] In the following description, "axial direction" refers to the direction along the axis Z of the rotation axis 12, i.e., the axial direction of the motor 11. In the axial direction, the side facing the motor 11 from the first circuit board 31 or the second circuit board 32 is defined as the first end side, and the side facing the motor 11 from the first circuit board 31 or the second circuit board 32 is defined as the second end side. In addition, "radial direction" refers to the radial direction of the rotation axis 12, i.e., the radial direction of the motor 11. The radial direction is the direction that intersects the axial direction. In this embodiment, the direction toward the first end side in the axial direction is an example of the "first direction" described in the claims. The direction toward the second end side in the axial direction is an example of the "second direction" described in the claims.

[0009] <About the motor device> As shown in Figure 1, the motor device 1 includes a motor 11, a motor case 21, a first circuit board 31, a second circuit board 32, a connector unit 41, and a cover 51.

[0010] The motor 11 includes a rotating shaft 12. The rotating shaft 12 is, for example, rotatable integrally with the rotor that constitutes the motor 11. The motor 11 is configured such that, for example, power is supplied to coil windings wound around the teeth of the stator that constitutes the motor 11, causing the rotor, which is located on the inner circumference of the stator, to rotate.

[0011] The motor case 21 includes a motor housing 22 and a bearing holder 101. The motor housing 22 is a bottomed cylindrical shape. The motor housing 22 is made of a metal material such as aluminum. The motor housing 22 houses the motor 11 inside. The motor housing 22 has a cylindrical portion 23, a bottom portion 24, a flange portion 25, and a housing peripheral portion 26. The first axial end of the cylindrical portion 23 is closed by the bottom portion 24. A first housing opening 21A is formed on the second axial end of the cylindrical portion 23, opening to the second end. The flange portion 25 extends radially outward from the second end of the cylindrical portion 23 so as to include the first housing opening 21A inside. The periphery of the flange portion 25 is surrounded by the housing peripheral portion 26. In other words, the housing peripheral portion 26 forms the outer shell of the flange portion 25. The housing periphery 26 is provided with, for example, four circuit board fastening portions 26a for attaching the first circuit board 31, which will be described later. The four circuit board fastening portions 26a are columnar in shape and protrude from the housing periphery 26 toward the second end in the axial direction. The housing periphery 26 has a polygonal shape when viewed from the axial direction. The polygonal shape is, for example, a combination of a square and a trapezoid. A second housing opening 22A is formed on the inner circumference of the housing periphery 26, opening toward the second end in the axial direction.

[0012] The bearing holder 101 has a cylindrical shape. The bearing holder 101 is made of the same type of metal material as the motor housing 22, for example, aluminum. The bearing holder 101 is press-fitted and fixed into the first housing opening 21A, thereby closing the opening on the second axial end side of the cylindrical portion 23. In other words, the bearing holder 101 isolates the internal space of the motor housing 22 in which the motor 11 is housed. The bearing holder 101 has a first heat dissipation section 102 and a second heat dissipation section 103 on its end face on the second axial end side. The first heat dissipation section 102 is located on the second axial end side of the second heat dissipation section 103. In other words, the end face on the second axial end side of the bearing holder 101 has a stepped shape in the axial direction. The first heat dissipation section 102 mainly promotes heat dissipation from the first circuit board 31. The second heat dissipation section 103 mainly promotes heat dissipation from the second circuit board 32.

[0013] A first through-hole 24a is formed in the center of the bottom portion 24, penetrating axially. A second through-hole 101a is formed in the center of the bearing holder 101, penetrating axially. The first end of the rotating shaft 12 is inserted through the first through-hole 24a via a bearing. The second end of the rotating shaft 12 is inserted through the second through-hole 101a via a bearing. As a result, the rotating shaft 12 is rotatably supported relative to the motor housing 22. The first end of the rotating shaft 12 protrudes to the outside of the bottom portion 24 through the first through-hole 24a. A coupling 12a is fixed to the tip of the first end of the rotating shaft 12 so as to be able to rotate integrally with the rotating shaft 12. The coupling 12a is connected to, for example, a worm gear mechanism that constitutes an electric power steering device. The second end of the rotating shaft 12 protrudes to the outside of the bearing holder 101 via the second through-hole 101a. A sensor holder 12b, into which a sensor magnet is press-fitted, is fixed to the tip of the second end of the rotating shaft 12 so as to be able to rotate integrally with the rotating shaft 12. Two through holes are formed on the periphery of the bearing holder 101, penetrating in the axial direction. Multiple motor terminals 15b and 15c, connected to the coil windings of the motor 11, protrude toward the second end through these two through holes. The multiple motor terminals 15b and 15c are terminals for supplying drive current from the first circuit board 31 and the second circuit board 32 to the coil windings of the motor 11. There are a total of six motor terminals 15b and 15c, three each corresponding to the first and second systems.

[0014] The first circuit board 31 and the second circuit board 32 are so-called printed circuit boards, for example, made of a resin material with electronic components 301 and wiring printed on both sides. The electronic components 301 include a control circuit that processes, calculates, transmits, receives, and stores control signals for controlling the rotation of the motor 11, and a drive (power) circuit for supplying power to the motor 11 according to the control signals calculated by the control circuit. When viewed from the axial direction, the first circuit board 31 has a polygonal shape corresponding to the housing periphery 26 and is slightly smaller than the periphery of the housing periphery 26. When viewed from the axial direction, the second circuit board 32 has a roughly trapezoidal shape and is approximately half the size of the first circuit board 31. The first circuit board 31 is located on the second axial end side of the second circuit board 32. The first circuit board 31 and the second circuit board 32 are electrically connected to each other by inter-board connectors 34 provided on their opposing surfaces. The first circuit board 31 is fixed to four circuit board fastening portions 26a provided on the housing periphery 26 by, for example, four circuit board fixing screws 321. The first circuit board 31 and the first heat dissipation portion 102 are in contact, for example, via thermal grease. The second circuit board 32 and the second heat dissipation portion 103 are in contact, for example, via thermal grease.

[0015] The connector unit 41 is a resin molded product that is insert-molded to enclose connector terminals made of metal material. The connector unit 41 is fixed to the first circuit board 31 and the second circuit board 32 from the axial first end side via, for example, five connector unit fixing screws 401a, 401b. The connector unit 41 is configured to electrically connect the first circuit board 31 and the second circuit board 32 with external equipment. The external equipment includes a power supply device such as an on-board power supply, and a control device for controlling the operation of on-board equipment other than the electric power steering device. The connector unit 41 will be described later.

[0016] The cover 51 is attached to the motor housing 22, for example by a snap fit, so as to close the second housing opening 22A of the motor housing 22. In other words, the cover 51 houses the first circuit board 31 and the second circuit board 32 between itself and the motor housing 22.

[0017] For example, as shown in Figure 5, the internal space formed by the motor housing 22 and the cover 51 is divided into a first housing section R1 and a second housing section R2 by the bearing holder 101. The first housing section R1 is formed by the motor housing 22 and the bearing holder 101. The second housing section R2 is formed by the cover 51 and the bearing holder 101. The motor 11 is housed in the first housing section R1. The first circuit board 31, the second circuit board 32, and a part of the connector unit 41 are housed in the second housing section R2. In this case, the part of the connector unit 41 other than the part housed in the second housing section R2 is exposed from the cover 51. The cover 51 will be described later. In this embodiment, the motor housing 22 and the cover 51 are examples of the "housing" described in the claims.

[0018] <Regarding the cover> In the following explanation, with respect to the radial direction, the vertical direction in Figure 2 is defined as the first radial direction, and the horizontal direction in Figure 2 is defined as the second radial direction. In the second radial direction, the left side is defined as the first end side, and the right side is defined as the second end side. The first end side in the second radial direction is also the side on which the second circuit board 32 is located.

[0019] As shown in Figure 2, the cover 51 is made of, for example, a resin material. The cover 51 has a cover end wall portion 52 and a cover peripheral wall portion 53. The cover peripheral wall portion 53 extends from the periphery of the cover end wall portion 52 toward the first end in the axial direction. The cover end wall portion 52 is surrounded by the cover peripheral wall portion 53. In other words, the cover peripheral wall portion 53 forms the outer casing of the cover end wall portion 52.

[0020] More specifically, the cover end wall portion 52 extends in a first radial direction and a second radial direction. When viewed from the axial direction, the cover end wall portion 52 has a polygonal shape corresponding to the housing periphery portion 26. The cover end wall portion 52 has a first cover end wall portion 521 and a second cover end wall portion 522. When viewed from the axial direction, the first cover end wall portion 521 is substantially square in shape. The first cover end wall portion 521 is located on the first end side in the second radial direction. When viewed from the axial direction, the second cover end wall portion 522 is substantially trapezoidal in shape. The second cover end wall portion 522 is located on the second end side in the second radial direction. The first cover end wall portion 521 is located on the second end side in the axial direction than the second cover end wall portion 522. The first cover end wall portion 521 and the second cover end wall portion 522 are connected via a cover end wall step portion 523 that extends along the first radial direction.

[0021] A cover opening 54 is formed in the first cover end wall 521, penetrating in the axial direction. The cover opening 54 has a polygonal shape when viewed from the axial direction. The polygonal shape is, for example, a combination of a rectangle and a trapezoid. The inner edge of the cover opening 54 is provided with a cover opening edge surface 54a facing inward in the radial direction. The cover opening edge surface 54a is provided continuously without interruption along the entire circumference of the inner edge of the cover opening 54. The area occupied by the cover opening 54 of the first cover end wall 521 is, for example, greater than 50%. Also, the area occupied by the cover opening 54 of the entire cover end wall 52 is, for example, greater than 50%. The area of ​​the cover opening 54 coincides with the axis Z of the rotation axis 12 when viewed from the axial direction. If a virtual line X is taken as a virtual line passing through axis Z and parallel to the second radial direction, the shape of the cover opening 54 is approximately symmetric with respect to the virtual line X. The cover opening 54 is positioned towards the first end of the first cover end wall 521 in the second radial direction when viewed from the axial direction. That is, the cover opening 54 includes a portion adjacent to the cover peripheral wall 53 at the first end in the second radial direction. The cover opening 54 extends to both ends of the first cover end wall 521 in the first radial direction when viewed from the axial direction. That is, the cover opening 54 includes portions adjacent to the cover peripheral wall 53 at both ends in the first radial direction. Furthermore, the cover opening 54 includes a portion adjacent to the cover end wall step portion 523 at the first end in the second radial direction when viewed from the axial direction.

[0022] As shown in Figures 3 and 4, a cover extension portion 55 is formed on the inner surface 521a of the first cover end wall portion 521, which is the first end surface in the axial direction of the first cover end wall portion 521. The cover extension portion 55 protrudes from the inner surface 521a of the first cover end wall portion 521a toward the first end in the axial direction. When viewed from the axial direction, the cover extension portion 55 has a polygonal shape corresponding to the cover opening 54. The cover extension portion 55 is provided continuously without interruption along the entire circumference of the cover opening 54. The cover extension portion 55 is provided between the cover opening 54 and the cover peripheral wall portion 53 in the radial direction. More specifically, the cover extension portion 55 is positioned at a distance D away from the cover opening 54 toward the radially outward direction. The cover extension portion 55 is provided with a cover extension surface 55a facing inward in the radial direction. When viewed from the axial direction, the cover extension portion 55 is positioned closer to the first end side in the second radial direction of the first cover end wall portion 521. In other words, the cover opening 54 includes a first adjacent portion P1, which is adjacent to the cover peripheral wall portion 53 at the first end in the second radial direction. When viewed from the axial direction, the cover opening 54 extends to both ends of the first cover end wall portion 521 in the first radial direction. In other words, the cover opening 54 includes a second adjacent portion P2, which is adjacent to the cover peripheral wall portion 53 at both ends in the first radial direction. The cover opening 54 also includes a third adjacent portion P3, which is adjacent to the cover end wall step portion 523 at the first end in the second radial direction when viewed from the axial direction. The first adjacent portion P1 and the second adjacent portion P2 are closer to the cover peripheral wall portion 53 than other parts of the cover opening 54. In the first adjacent portion P1 and the second adjacent portion P2, the cover extension portion 55 also serves as a part of the cover peripheral wall portion 53. As a result, the cover extension surfaces 55a of the first adjacent portion P1 and the second adjacent portion P2 also serve as the inner surface 53a of the cover peripheral wall portion 53. Similarly, in the third adjacent portion P3, the cover extension portion 55 also serves as a part of the cover end wall step portion 523. As a result, the cover extension surface 55a of the third adjacent portion P3 also serves as the inner surface 523a of the cover end wall step portion 523.

[0023] As shown in Figures 5 and 6, the cover extension portion 55 includes a straight portion 56 and an inclined portion 57. The straight portion 56 is the portion of the cover extension portion 55 at the second axial end, and is the portion where the cover extension surface 55a is provided on the radially inner portion. The straight portion 56 is provided linearly along the axial direction. The inclined portion 57 is the portion of the cover extension portion 55 at the first axial end, and is the portion that has a slope that gradually widens towards the radially outer portion as it approaches the first axial end. In the first adjacent portion P1 and the second adjacent portion P2, the cover extension surface 55a at the first axial end of the inclined portion 57, i.e., the inner surface 53a of the cover peripheral wall, is connected to the inner surface 53a of the cover peripheral wall in the portion where the cover extension portion 55 is not provided. As a result, in the first adjacent portion P1 and the second adjacent portion P2, the thickness of the cover peripheral wall portion 53 is increased by the amount of the cover extension portion 55. Here, the first axial end of the inclined portion 57 does not reach the surface of the first circuit board 31. This is to prevent the thicker portions of the cover peripheral wall 53, namely the first adjacent portion P1 and the second adjacent portion P2, from coming into contact with the first circuit board 31 when the cover 51 is attached to the motor housing 22. In the third adjacent portion P3, the first axial end of the inclined portion 57 connects to the inner surface 523a of the cover end wall step midway through the inner surface 523a of the cover end wall step. As a result, in the third adjacent portion P3, the thickness of the cover end wall step 523 is increased by the amount of the cover extension portion 55.

[0024] In this embodiment, the cover end wall portion 52 is an example of the "end wall portion" described in the claims. The inner surface 521a of the first cover end wall is an example of the "inner surface of the end wall portion" described in the claims. The cover peripheral wall portion 53 is an example of the "peripheral wall portion" described in the claims. The inner surface 53a of the cover peripheral wall is an example of the "inner surface of the peripheral wall portion" described in the claims. The cover opening 54 is an example of the "opening" described in the claims. The cover opening edge surface 54a is an example of the "opening edge surface" described in the claims. The cover extension portion 55 is an example of the "extension portion" described in the claims. The cover extension surface 55a is an example of the "extension surface" described in the claims. The straight portion 56 is an example of the "passage forming portion" described in the claims. The inclined portion 57 is an example of the "inclined forming portion" described in the claims.

[0025] <About the Connector Unit> As shown in Figures 1, 2, 5, and 6, the entire connector unit 41 overlaps with the first circuit board 31 when viewed from the axial direction. A part of the connector unit 41 overlaps with the entire second circuit board 32 when viewed from the axial direction. The connector unit 41 does not overlap with the four circuit board fixing screws 321, i.e., the four circuit board fastening parts 26a, when viewed from the axial direction. The connector unit 41 coincides with the axis Z of the rotation axis 12 when viewed from the axial direction. The connector unit 41 has a shape that is approximately symmetric with respect to the imaginary line X. The connector unit 41 is positioned towards the first end side in the second radial direction of the first circuit board 31 when viewed from the axial direction.

[0026] The connector unit 41 has an inner portion 42, a connector portion 43, and a connecting portion 44. The inner portion 42 is housed in the second housing portion R2. The connector portion 43 is exposed to the outside of the cover 51 through the cover opening 54. The connecting portion 44 connects the connector portion 43 and the inner portion 42 in the axial direction.

[0027] More specifically, the inner portion 42 has a base portion 421 and an inner wall portion 422. The base portion 421 has a polygonal shape corresponding to the cover opening 54 when viewed from the axial direction. The base portion 421 is provided continuously along the cover opening 54 without interruption. The base portion 421 is provided with a base surface 421a facing the inner surface 521a of the first cover end wall. The inner wall portion 422 extends from the base portion 421 toward the first end in the axial direction. The inner wall portion 422 is provided continuously along the base portion 421 without interruption. The inner wall portion 422 is provided with an inner wall surface 422a facing the cover extending surface 55a. The length of the inner wall surface 422a extending axially from the base surface 421a is length L1. Length L1 is the length that extends further toward the first end in the axial direction than the cover extending surface 55a. The inner wall portion 422 has, for example, five support columns 424 extending from the base portion 421 toward the first end in the axial direction.

[0028] The five support columns 424 are, for example, cylindrical in shape. Screw grooves are provided on the end faces of the first axial ends of the five support columns 424. The five support columns 424 extend axially beyond the portion where the inner wall surface 422a is provided. Of the five support columns 424, three support columns 424a have a length L2 that reaches the first circuit board 31. That is, length L2 is greater than length L1. The three support columns 424a are fastened to the first circuit board 31 from the first axial end via three connector unit fixing screws 401a. The three support columns 424 are fixed to three fastening holes 31a provided in the first circuit board 31.

[0029] Of the five support columns 424, two support columns 424b have a length L3 that extends beyond the first circuit board 31 to the second circuit board 32. That is, length L3 is greater than both length L1 and length L2. The two support columns 424b are fastened to the second circuit board 32 from the axial first end side via two connector unit fixing screws 401b. The two support columns 424b are fixed to two fastening holes 32b provided in the second circuit board 32. The two support columns 424b extend beyond the first circuit board 31 toward the second circuit board 32 via two notches 31c provided in the first circuit board 31.

[0030] The connecting portion 44 has a polygonal shape corresponding to the shape of the base portion 421, that is, the shape of the cover opening 54. A connector portion 43 is formed on the connecting portion axial end face 441a, which is the end face of the connecting portion 44 on the second axial end side. The connecting portion 44 is the part connected to the inner portion 42, and the first connecting portion 442, which is the part on the first axial end side, is housed in the second housing portion R2. The connecting portion 44 is the part where the connector portion 43 is provided, and the second connecting portion 443, which is the part on the second axial end side, is exposed to the outside of the cover 51 through the cover opening 54. The connecting portion 44 is provided with a connecting surface 44a facing radially outward. The first connecting surface 442a of the connecting surface 44a, which corresponds to the first connecting portion 442, faces the cover opening edge surface 54a on the inner edge of the cover opening 54. The second connecting surface 443a of the connecting surface 44a, which corresponds to the second connecting portion 443, is exposed from the cover opening 54.

[0031] The connector section 43 includes a first power connector section 431a, a second power connector section 431b, a first signal connector section 432a, a second signal connector section 432b, and a torque sensor connector section 433. The first power connector section 431a corresponds to the first system, and the second power connector section 431b corresponds to the second system. The first power connector section 431a and the second power connector section 431b each have adjacent, substantially elliptical positive and negative electrode sections. The power terminals among the connector terminals are housed inside the first power connector section 431a and the second power connector section 431b. The power terminals are for inputting power from an external device to the first circuit board 31 and the second circuit board 32. The first signal connector section 432a corresponds to the first system, and the second signal connector section 432b corresponds to the second system. The first signal connector section 432a and the second signal connector section 432b are each substantially rectangular parallelepiped in shape. Control signal terminals are housed within the connector terminals of the first signal connector section 432a and the second signal connector section 432b. The control signal terminals are used to input and output, for example, in-vehicle signals from an external device to the first circuit board 31 and the second circuit board 32. The torque sensor connector section 433 is substantially rectangular parallelepiped in shape. Torque sensor signal terminals are housed within the connector terminals of the torque sensor connector section 433. The torque sensor signal terminals are used to input torque signals, etc., from a torque sensor (not shown) to the first circuit board 31 and the second circuit board 32.

[0032] Each connector portion 43 is provided on the outer edge of the shaft end face 441a of the connection portion 44, that is, in a portion close to the cover opening 54 of the cover 51. The first power connector portion 431a and the second power connector portion 431b are positioned closer to the second end in the second radial direction of the shaft end face 441a of the connection portion when viewed from the axial direction. The first signal connector portion 432a and the second signal connector portion 432b are positioned closer to opposite sides of the shaft end face 441a of the connection portion in the first radial direction when viewed from the axial direction. The torque sensor connector portion 433 is positioned closer to the first end in the second radial direction of the shaft end face 441a of the connection portion when viewed from the axial direction. The first power connector portion 431a and the second power connector portion 431b are provided substantially symmetrically with respect to the imaginary line X. The first signal connector portion 432a and the second signal connector portion 432b are provided substantially symmetrically with respect to the imaginary line X. The torque sensor connector section 433 is located on the virtual line X.

[0033] <About the sealing structure of the cover and connector unit> As shown in Figure 6, when the cover 51 is assembled to the motor housing 22, a gap G exists between the connector unit 41 and the cover 51, that is, between the connector unit 41 and the cover opening 54. The gap G is sealed by filling it with adhesive 701. The adhesive 701 is, for example, silicone. The gap G forms a passage connecting a first passage opening 901 that communicates with the outside of the cover 51 and a second passage opening 902 that communicates with the inside of the cover 51. The first passage opening 901 is the part between the cover opening 54 and the first connecting portion 442 of the connecting portion 44. The second passage opening 902 is the part between the cover peripheral wall portion 53 and the inner wall portion 422. The gap G has a first passage 801, a second passage 802, and a third passage 803.

[0034] More specifically, the first passage 801 is the gap between the first connecting surface 442a and the cover opening edge surface 54a. The first passage 801 extends axially from the first passage opening 901. The second passage 802 is the gap between the inner wall surface 422a and the cover extending surface 55a, that is, between the inner wall surface 422a and the straight section 56. The second passage 802 extends axially from the second passage opening 902. The third passage 803 is the gap between the base surface 421a and the inner surface 521a of the first cover end wall. The third passage 803 extends radially to connect the side of the first passage 801 opposite to the first passage opening 901 and the side of the second passage 802 opposite to the second passage opening 902. The radial width W1 of the first passage 801 is greater than the radial width W2 of the second passage 802. The width W1 is greater than the width W3 in the axial direction of the third passage 803. Widths W2 and W3 are approximately the same. The values ​​of widths W1, W2, and W3 are experimentally determined values ​​that take into account, for example, the material of the adhesive 701 and the shape of the gap. The radial width of the second passage 802 is kept constant at width W2 between the inner wall surface 422a and the straight section 56, while the width between the inner wall surface 422a and the inclined section 57 increases towards the first end in the axial direction.

[0035] Adhesive 701 is filled into the first passage 801 and the third passage 803 of the gap G. Adhesive 701 is also filled into the second passage 802 up to a certain point. The adhesive 701 filled into the gap G is filled so that it protrudes from the first passage opening 901 to the outside of the cover 51. At the first passage opening 901, the adhesive 701 that protrudes to the outside of the cover 51 forms an overflow portion 711. The amount of overflow, which is the axial length of the overflow portion 711, is length H. Length H is a value that can be experimentally obtained to suppress the occurrence of a "water puddle" in which, for example, water accumulates in the recessed portion of the adhesive 701 at the first passage opening 901, due to insufficient overflow of adhesive 701. The occurrence of a "water puddle" causes deterioration of the adhesive 701 and, consequently, a decrease in the sealing performance of the motor device 1. This is particularly noticeable when the water contains salt.

[0036] <About the Cover Assembly Process> Figure 7 shows the process of assembling the cover 51 to the motor housing 22 (hereinafter referred to as the "cover assembly process"), which is part of the manufacturing process of the motor device 1. The cover assembly process is performed with the controller ASSY, which has the connector unit 41 fastened to the first circuit board 31 and the second circuit board 32, attached to the housing periphery 26 of the motor housing 22. Factory equipment is used in the cover assembly process. The factory equipment includes, for example, a dispenser with a nozzle and an arm for gripping the motor housing 22.

[0037] The cover assembly process includes an adhesive application process and a cover lowering process. The adhesive application process includes dispensing adhesive 701 from a nozzle while the motor housing 22 is gripped by an arm. The adhesive application process also includes applying the adhesive 701 over the entire circumference of the base surface 421a by moving the dispenser along the entire circumference of the base surface 421a. As a result, the adhesive 701 is applied, for example, to the radially outer portion of the base surface 421a.

[0038] The cover lowering step, after the adhesive application step, includes lowering the cover 51 from the upper side, which is the second axial end, in the direction of the arrow in the figure so that it approaches the motor housing 22. The cover lowering step also includes positioning the connector portion 43 and the cover opening 54 so that they overlap in the axial direction. In this case, the positioning of the connector portion 43 and the cover opening 54 is guided by the inclined portion 57.

[0039] As a result, as shown in Figure 6, the adhesive 701 applied through the adhesive application process is compressed between the inner surface 521a of the first cover end wall and the base surface 421a, i.e., within the third passage 803. Within the third passage 803, the adhesive 701 spreads out toward the first passage 801 and the second passage 802. The adhesive 701 that spreads out toward the first passage 801 protrudes outside the motor device 1 at the first passage opening 901, forming an overflow portion 711. The adhesive 701 that spreads out toward the second passage 802 enters the second passage 802 but does not reach the second passage opening 902. Therefore, the adhesive 701 fills the first passage 801 and the third passage 803, and also fills partway through the second passage 802. Through this cover assembly process, a motor device 1 having a seal structure as shown in Figure 6 is manufactured.

[0040] <Operation and Effects of this Embodiment> As described above, in the cover lowering process, the adhesive 701 applied through the adhesive application process is crushed within the third passage 803, causing it to spread out toward the first passage 801 and the second passage 802 within the third passage 803.

[0041] In contrast, the width W1 of the first passage 801 is greater than the width W2 of the second passage 802. Therefore, when the adhesive 701 is spread within the third passage 803, it is more likely to spread toward the first passage 801, which has a relatively larger width W1, than toward the second passage 802, which has a relatively smaller width W2. As a result, the adhesive 701 fills at least the first passage 801 and the third passage 803. In this case, as the adhesive 701 spreads into the first passage 801, it extends and spreads so as to protrude from the first passage opening 901 toward the second end in the axial direction. Therefore, the adhesive 701 can be actively made to protrude from the first passage 801 to the outside of the cover 51. This is effective in preventing, for example, the occurrence of "water puddles" due to insufficient excess adhesive 701 from the first passage 801 to the outside of the cover 51, and in suppressing the progression of deterioration of the adhesive 701 caused by these "water puddles." In other words, it is possible to improve the reliability of the sealing performance of the gap G between the connector unit 41 and the cover opening 54.

[0042] <Effects of this embodiment> According to this embodiment described above, the following further effects can be obtained. (1-1) When the adhesive 701 is spread in the third passage 803, it is less likely to spread toward the second passage 802, which has a relatively smaller width W2, than toward the first passage 801, which has a relatively larger width W1. Therefore, the amount of adhesive 701 that spreads toward the second passage 802 can be reduced. Consequently, there is no need to secure an extra amount of adhesive 701, and the amount of adhesive 701 used can be suppressed.

[0043] (1-2) The cover extension surface 55a is continuously provided along the entire circumference of the cover opening edge surface 54a so as to surround the cover opening edge surface 54a. Therefore, the gap G between the connector unit 41 and the cover opening 54 can be suitably sealed.

[0044] (1-3) In the first adjacent portion P1 and the second adjacent portion P2, that is, at the location where the cover opening 54 and the cover peripheral wall 53 are adjacent to each other, the cover extending portion 55 also serves as a part of the cover peripheral wall 53. In other words, the cover extending surface 55a also serves as the inner surface 53a of the cover peripheral wall. Therefore, when adopting the cover extending portion 55 for the cover end wall 52 to form the second passage 802, the scale of modification to the configuration of the cover end wall 52 can be suppressed.

[0045] (1-4) In the motor device 1 of the present embodiment, a part of the connector unit 41, that is, the connector portion 43, is exposed from the cover opening 54 to the second axial end side. Even with the motor device 1 having such a configuration, it is possible to suppress the occurrence of the aforementioned "water pooling" caused by insufficient extrusion of the adhesive 701 from the first passage 801 to the outside of the cover 51, and the progress of deterioration of the adhesive 701 caused by "water pooling". Therefore, the reliability of the sealing performance of the gap G between the connector unit 41 and the cover opening 54 can be improved.

[0046] (1-5) Since the cover 51 is a resin molded product, the cover 51 having the cover end wall 52, the cover peripheral wall 53, and the cover extending portion 55 can be manufactured without requiring processes such as cutting, for example, by insert molding using a mold. This is effective in facilitating the manufacturing of the cover 51.

[0047] (1-6) The cover extending portion 55 has a straight portion 56 that forms the second passage 802 by extending so as to maintain a constant distance between the cover extending surface 55a and the inner wall surface 422a. The cover extending portion 55 has an inclined portion 57 that gradually increases the distance between the cover extending surface 55a and the inner wall surface 422a as it goes from the straight portion 56 toward the first axial end side. Thereby, the straight portion 56 can be used to form the second passage 802. On the other hand, the inclined portion 57 can be used as a guide when attaching the cover 51 to the motor housing 22 via the connector unit 41.

[0048] (1-7) A width W1 of a first passage 801 is larger than a width W3 of a third passage 803. This allows the adhesive 701 to be positively protruded toward the first passage 801 side without excessively increasing the amount of the adhesive 701. Accordingly, both improvement in reliability of sealing performance in the motor device 1 and suppression of an increase in the usage amount of the adhesive 701 can be achieved at the same time.

[0049] (1-8) An inner portion 42 includes five strut portions 424a and 424b extending from a base portion 421 toward a first axial end side. An axial length L1 of an inner wall surface 422a is smaller than a length L2 of the three strut portions 424a and a length L3 of the two strut portions 424b. Therefore, even when the five strut portions 424a and 424b are provided, the connector unit 41 can be fixed to the first circuit board 31 and the second circuit board 32 without interfering with formation of the second passage 802.

[0050] <Second Embodiment> Hereinafter, a motor device 1 according to a second embodiment will be described with reference to the drawings, focusing on differences from the first embodiment. For convenience of description, the same reference numerals as those in the first embodiment are given to the same configurations as those in the first embodiment, and the description thereof is omitted.

[0051] In the motor device 1 of the present embodiment, instead of the configuration of the first embodiment in which a cover opening 54 is provided in a cover 51, a housing opening 541 is provided in a motor housing 221 instead of a cover 511.

[0052] More specifically, as shown in Figure 8, the flange portion 251 of the motor housing 221 in this embodiment extends radially in one direction from the second end side of the cylindrical portion 23, including the first housing opening 21A inside. That is, the housing peripheral portion 26 extends radially in one direction from the second end side of the cylindrical portion 23, following the flange portion 251. The motor device 1 in this embodiment has a single circuit board 33. The circuit board 33 is fixed to the flange portion 251 such that it has a protruding portion 331 which does not overlap with the cylindrical portion 23 when viewed from the axial direction. A connector unit 411 is provided on the first axial end side of the protruding portion 331, that is, the portion of the flange portion 251 that does not overlap with the cylindrical portion 23 when viewed from the axial direction. The connector portion 430 in this embodiment is exposed to the outside of the motor housing 221 through a housing opening 541 provided in the flange portion 251. In the radial direction, a housing extension 551 is provided between the housing opening 541 and the housing peripheral edge 26. The connector portion 430 is exposed from the first end side in the axial direction.

[0053] In this embodiment, the first axial end is an example of the "second direction" described in the claims. The second axial end is an example of the "first direction" described in the claims. As shown in Figure 8, a gap G1 exists between the connector unit 411 and the motor housing 221, that is, between the connector unit 411 and the inner edge of the housing opening 541. The gap G1 forms a passage connecting a first passage opening 9011 that communicates with the outside of the motor housing 221 and a second passage opening 9021 that communicates with the inside of the motor housing 221. In other words, the gap G1 has a first passage 8011, a second passage 8021, and a third passage 8031, which correspond to the first passage 801, second passage 802, and third passage 803 of the first embodiment. Of the first passage 8011, second passage 8021, and third passage 8031, at least the first passage 8011 and the third passage 8031 ​​are filled with adhesive 701.

[0054] In this practical application, the flange portion 251 is an example of the "end wall portion" described in the claims. The housing peripheral portion 26 is an example of the "peripheral wall portion" described in the claims. The housing opening 541 is an example of the "opening" described in the claims. The housing extension portion 551 is an example of the "extension portion" described in the claims.

[0055] <Effects of the Second Embodiment> According to the second embodiment described above, effects similar to those of the first embodiment can be obtained, and further effects described below can be obtained.

[0056] (2-1) In this embodiment, a part of the connector unit 411, namely the connector portion 430, is exposed from the housing opening 541 to the first axial end. Even with a motor device 1 configured in this way, it is possible to suppress the occurrence of the "water accumulation" due to insufficient overflow of adhesive 701 from the first passage 8011 to the outside of the motor housing 221, and to suppress the progression of deterioration of the adhesive 701 caused by the "water accumulation". Therefore, the reliability of the sealing performance of the gap G1 between the connector unit 411 and the housing opening 541 can be improved.

[0057] <Other Embodiments> The first and second embodiments described above may be modified as follows. Furthermore, the following other embodiments can be combined with each other to the extent that they do not contradict the technical standards.

[0058] - In the first embodiment, the first circuit board 31 and the second circuit board 32 may be integrated into a single circuit board. - In the first embodiment, the cover 51 does not have to be a resin molded product. For example, it may be made of a metal material. In this case, in the first embodiment, the cover opening 54 can be formed by punching out the cover 51. Other embodiments described herein are similarly applicable to the second embodiment.

[0059] - In the first embodiment, the cover end wall portion 52 does not have a second cover end wall portion 522. In other words, the cover end wall portion 52 may be without the cover end wall step portion 523. - In the first embodiment, the cover extending surface 55a may be interrupted in part while along the inner edge of the cover opening edge surface 54a. Other embodiments described herein are similarly applicable to the second embodiment.

[0060] In the first embodiment, the shape and arrangement of the cover opening 54 may be changed as appropriate. For example, the cover opening 54 may be arranged so that the center of gravity of the cover opening 54 coincides with the axis Z. Alternatively, for example, the cover opening 54 may be located in the center of the cover end wall portion 52.

[0061] In the first embodiment, the cover extension 55 does not have to be part of the cover peripheral wall 53 in the first adjacent portion P1 and the second adjacent portion P2. Similarly, in the third adjacent portion P3, the cover extension 55 does not have to be part of the cover end wall step portion 523. Furthermore, the cover extension 55 may be part of the cover peripheral wall 53 or the cover end wall step portion 523 not only in the first adjacent portion P1, the second adjacent portion P2 and the third adjacent portion P3, but also around the entire circumference of the cover extension 55.

[0062] - In the first embodiment, it is not essential that the cover extension 55 has an inclined portion 57. Other embodiments described herein are similarly applicable to the second embodiment. - In the first embodiment, it is not essential that the first power connector portion 431a and the second power connector portion 431b are provided on the outer edge of the connecting portion shaft end face 441a, i.e., in a portion close to the cover opening 54 of the cover 51. Other embodiments described herein are similarly applicable to the first power connector portion 431a, the second power connector portion 431b, the first signal connector portion 432a, the second signal connector portion 432b, and the torque sensor connector portion 433. Other embodiments described herein are similarly applicable to the second embodiment.

[0063] In the first embodiment, the lengths L2 of the three support columns 424a and L3 of the two support columns 424b may be appropriately changed depending on the arrangement of the first circuit board 31 and the second circuit board 32. The other embodiments described herein are also applicable to the second embodiment.

[0064] In the first embodiment, the length L1 extending axially from the base surface 421a of the inner wall surface 422a may be greater than the length L2, i.e., the length L3. In other words, the inner wall surface 422a may extend further axially toward the first end than the five support columns 424a, 424b. Other embodiments described herein are similarly applicable to the second embodiment.

[0065] In the first embodiment, the length L1 of the inner wall surface 422a extending axially from the base surface 421a may be smaller than the length extending axially toward the first end side of the cover extension surface 55a, provided that the second passage 802 can be formed. Other embodiments described herein are similarly applicable to the second embodiment.

[0066] In the first embodiment, the inner wall surface 422a may be interrupted in part along the outer edge of the base portion 421. In this case, for example, the interrupted portion corresponds to the five support columns 424a, 424b. Other embodiments described herein are similarly applicable to the second embodiment.

[0067] In the first embodiment, the width W3 of the third passage 803 may be greater than the width W1 of the first passage 801. Alternatively, the width W3 of the third passage 803 may be the same as the width W1 of the first passage 801. The other embodiments described herein are also applicable to the second embodiment.

[0068] In the first embodiment, the width W2 of the second passage 802 may be smaller than the width W3 of the third passage 803. Alternatively, the width W2 of the second passage 802 may be smaller than the width W1 of the first passage 801, but larger than the width W3 of the third passage 803. Other embodiments described herein are similarly applicable to the second embodiment.

[0069] In the first embodiment, the entire second passage 802 may be filled with adhesive 701. In this case, the adhesive 701 may extend beyond the second passage opening 902 and enter the second housing R2. Other embodiments described herein are similarly applicable to the second embodiment.

[0070] In the first embodiment, the motor device 1 may be a so-called cylindrical type. In a cylindrical motor device 1, the axis Z of the rotating shaft 12 coincides with the center point of the motor housing 22 and the cover 51. In this case, the cover opening 54 may be positioned such that the center of gravity of the cover opening 54 coincides with the axis Z. Alternatively, the cover opening 54 may be positioned so as to be symmetric with respect to an arbitrary imaginary line Y that passes through the axis Z and extends in the radial direction. Alternatively, the cover opening 54 may be positioned to one side in the radial direction with respect to the imaginary line Y.

[0071] In the first embodiment, the motor device 1 may employ a so-called single-system that drives the motor 11 using a single system. Alternatively, a partially redundant system may be employed, such as by making one of the following a dual system: the coil winding of the motor 11, the electronic component 301, the connection terminals of the connector unit 41, the connector part 43, etc. As an example of a partially redundant system motor device 1, a motor device 1 can be considered in which one power connector part 431 is provided instead of the two first power connector parts 431a and the second power connector part 431b. In this motor device 1, the one power connector part 431 can be positioned closer to the second end in the second radial direction of the connection part shaft end face 441a when viewed from the axial direction. Alternatively, the one power connector part 431 can be positioned on the above-mentioned imaginary line X. Other embodiments described herein are similarly applicable to the second embodiment.

[0072] In the first embodiment, the motor device 1 may be mounted on a steer-by-wire system. In this case, the motor 11 functions as a reaction motor or a steering motor. The reaction motor generates a steering reaction force applied to the steering wheel. The steering motor generates a steering force for steering the steering wheels of the vehicle. Other embodiments described herein are similarly applicable to the second embodiment.

[0073] <Other Technical Matters> The following describes the technical matters that can be understood from each of the above embodiments and modified examples. (Technical Matter 1) A motor device comprising: a motor having a rotating shaft; a circuit board for controlling the operation of the motor; a housing for housing the motor and the circuit board inside; and a connector unit housed inside the housing with a portion of it exposed to the outside of the housing, wherein the housing has an opening that penetrates in the axial direction of the rotating shaft, and has an end wall portion extending in the radial direction of the rotating shaft, and a peripheral wall portion extending from the periphery of the end wall portion in a first direction along the axial direction, wherein the connector unit has a connector portion exposed to the outside of the housing through the opening so as to extend in a second direction opposite to the first direction, an inner portion housed inside the housing, and a connecting portion that connects the connector portion and the inner portion in the axial direction, wherein the inner portion has a base surface facing the inner surface of the end wall portion in the axial direction, and an inner wall surface extending from the outer edge of the base surface in a first direction and facing the radial direction, The motor device comprises a motor device in which the connecting portion extends from the inner edge of the base surface in the second direction and has a connecting surface facing the opening edge surface of the opening, the end wall portion is an extending portion provided between the opening and the peripheral wall portion, and includes an extending portion that extends from the inner surface of the end wall portion in the first direction and has an extending surface facing the inner wall surface, the gap between the connecting surface and the opening edge surface forms a first passage extending in the axial direction to communicate with the outside of the housing, the gap between the inner wall surface and the extending surface forms a second passage extending in the axial direction to communicate with the inside of the housing, the gap between the base surface and the inner surface of the end wall portion forms a third passage extending in the radial direction to connect the first passage and the second passage, and at least the first passage and the third passage of the first passage, second passage and third passage are filled with a sealing adhesive, and the width of the first passage is greater than the width of the second passage.

[0074] (Technical matter 2) The motor device according to technical matter 1, wherein the extending surface is continuously provided along the entire circumference of the opening edge surface so as to surround the opening edge surface. (Technical matter 3) The motor device according to technical matter 1 or technical matter 2, wherein at locations where the opening and the peripheral wall portion are adjacent to each other, the extending portion also serves as a part of the peripheral wall portion, and the extending surface also serves as the inner surface of the peripheral wall portion.

[0075] (Technical matter 4) The motor device according to any one of technical matters 1 to 3, wherein the extending portion includes a passage forming portion that extends from the end wall portion in the first direction so as to maintain a constant distance between the inner wall surface and the extending surface, thereby forming the second passage, and a slope forming portion that extends from the passage forming portion in the first direction so as to gradually increase the distance between the extending surface and the inner wall surface.

[0076] (Technical matter 5) The motor device according to any one of technical matters 1 to 4, wherein the width of the first passage is greater than the width of the third passage. (Technical matter 6) The motor device according to any one of technical matters 1 to 5, wherein the inner portion has a support column that extends in the first direction from the portion having the base surface and fastens with the circuit board, and in the axial direction, the length of the inner wall surface is less than the length of the support column.

[0077] (Technical matter 7) The motor device according to any one of technical matters 1 to 6, wherein the housing includes a motor housing that forms a first housing portion for housing the motor, and a cover that forms a second housing portion between itself and the motor housing for housing the circuit board and the connector unit, and the cover has an end wall portion, a peripheral wall portion, and an extended portion.

[0078] (Technical matter 8) The motor device according to any one of technical matters 1 to 6, wherein the housing includes a motor housing that forms a first housing portion for housing the motor, and a cover that forms a second housing portion between itself and the motor housing for housing the circuit board and the connector unit, and the motor housing has the end wall portion, the peripheral wall portion, and the extended portion.

[0079] (Technical matter 9) The motor device according to technical matter 7 or technical matter 8, wherein the cover is a resin molded product.

Claims

1. A motor device comprising: a motor having a rotating shaft; a circuit board for controlling the operation of the motor; a housing for housing the motor and the circuit board; and a connector unit housed inside the housing with a portion of it exposed to the outside of the housing, wherein the housing has an opening that penetrates in the axial direction of the rotating shaft, and has an end wall portion extending radially in the direction of the rotating shaft, and a peripheral wall portion extending from the periphery of the end wall portion in a first direction along the axial direction, the connector unit has a connector portion exposed to the outside of the housing through the opening so as to extend in a second direction opposite to the first direction, an inner portion housed inside the housing, and a connecting portion that connects the connector portion and the inner portion in the axial direction, the inner portion has a base surface facing the inner surface of the end wall portion in the axial direction, and an inner wall surface extending from the outer edge of the base surface in a first direction and facing radially, The connecting portion extends from the inner edge of the base surface in the second direction and has a connecting surface facing the opening edge surface of the opening; the end wall portion is an extended portion provided between the opening and the peripheral wall portion, and includes an extended portion that extends from the inner surface of the end wall portion in the first direction and has an extended surface facing the inner wall surface; the gap between the connecting surface and the opening edge surface forms a first passage extending in the axial direction to communicate with the outside of the housing; the gap between the inner wall surface and the extended surface forms a second passage extending in the axial direction to communicate with the inside of the housing; the gap between the base surface and the inner surface of the end wall portion forms a third passage extending in the radial direction to connect the first passage and the second passage; at least the first passage and the third passage are filled with a sealing adhesive; and the width of the first passage is greater than the width of the second passage.

2. The motor device according to claim 1, wherein the extending surface is continuously provided along the entire circumference of the opening edge surface so as to surround the opening edge surface.

3. The motor device according to claim 2, wherein, at locations where the opening and the peripheral wall are adjacent to each other, the extended portion also serves as a part of the peripheral wall, and the extended surface also serves as the inner surface of the peripheral wall.

4. The motor device according to claim 1, wherein the housing includes a motor housing that forms a first housing portion for housing the motor, and a cover that forms a second housing portion between itself and the motor housing for housing the circuit board and the connector unit, and the cover has an end wall portion, a peripheral wall portion, and an extended portion.

5. The motor device according to claim 4, wherein the cover is a resin molded product.

6. The motor device according to claim 1, wherein the extending portion includes a passage forming portion that extends from the end wall portion in the first direction to maintain a constant distance between the inner wall surface and the extending surface, thereby forming the second passage, and a slope forming portion that extends from the passage forming portion in the first direction to gradually increase the distance between the extending surface and the inner wall surface.

7. The motor device according to claim 1, wherein the width of the first passage is greater than the width of the third passage.

8. The motor device according to claim 1, wherein the inner portion has a support column that extends in the first direction from the portion having the base surface and fastens to the circuit board, and in the axial direction, the length of the inner wall surface is less than the length of the support column.

9. The motor device according to claim 1, wherein the housing includes a motor housing that forms a first housing portion for housing the motor, and a cover that forms a second housing portion between itself and the motor housing for housing the circuit board and the connector unit, and the motor housing has the end wall portion, the peripheral wall portion, and the extended portion.

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