Drive device

Abstract

A drive device according to one embodiment of the present invention is provided with: a motor having a rotor capable of rotating about a central axis and a stator facing the rotor in the radial direction; a sensor attached to the motor; an inverter electrically connected to the motor; and a housing that houses the motor and the inverter. The stator has a coil and a lead wire extending from the coil to one side in the axial direction. The inverter has a lead-out line connection part connected to the lead-out line. The inverter has a cable connection portion connected to a power supply cable extending from an external power source, and a sensor connection portion connected to a sensor wiring extending from the sensor. The housing is provided with an opening that opens radially outward with respect to the central axis, and a through-hole through which a power supply cable passes. The opening portion is disposed so as to overlap with the lead wire connection portion, the cable connection portion, and the sensor connection portion in the radial direction of the central axis.

Description

Technical Field

[0001] The present invention relates to a drive device.

[0002] This application claims priority based on Japanese Patent Application No. 2022-157801 filed in Japan on September 30, 2022, the contents of which are cited herein. Background Art

[0003] In recent years, as a drive device mounted on an electric vehicle or the like, a drive device having a motor and an inverter connected to the motor has been developed. Such a drive device has a motor, an inverter, and a housing for accommodating them. In addition, a connection portion for electrically connecting the motor and the inverter is arranged inside the housing (for example, Patent Document 1).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2010-268633 Summary of the invention

[0007] Problems to be solved by the invention

[0008] The inverter is provided with a connection part not only to the motor, but also to the power supply cable extending from the battery, the wiring for the sensor, etc. In the existing inverter, each connection part is respectively arranged in each part of the inverter, and the connection is performed by opening a plurality of opening parts provided in the housing, or before being stored in the housing, or by leading out to the outside of the housing. In either case, there is a problem of complicating the assembly process.

[0009] In view of the above situation, one of the objects of the present invention is to provide a driving device capable of simplifying the assembly process.

[0010] Means for solving problems

[0011] A driving device according to one embodiment of the present invention comprises: a motor having a rotor capable of rotating about a central axis and a stator radially opposed to the rotor; a sensor mounted on the motor; an inverter electrically connected to the motor; and a housing accommodating the motor and the inverter. The stator comprises a coil and a lead wire extending from the coil to one side in an axial direction. The inverter comprises a lead wire connection portion connected to the lead wire. The inverter comprises a cable connection portion connected to a power supply cable extending from an external power source and a sensor connection portion connected to a sensor wiring extending from the sensor. The housing is provided with: an opening portion opening radially outward relative to the central axis; and a through hole through which the power supply cable passes. The opening portion is arranged so as to overlap with the lead wire connection portion, the cable connection portion, and the sensor connection portion in a radial direction of the central axis.

[0012] Effects of the Invention

[0013] According to one aspect of the present invention, it is possible to provide a driving device capable of simplifying the assembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a perspective view of a driving device according to one embodiment.

[0015] Figure 2 This is a conceptual diagram of a driving device according to one embodiment.

[0016] Figure 3 This is a plan view of the vicinity of an opening portion of a driving device according to one embodiment.

[0017] Figure 4 This is a cross-sectional view of an embodiment taken along a section line passing through an opening. DETAILED DESCRIPTION

[0018] In the following description, the gravity direction is defined and described based on the positional relationship when the drive device 1 is mounted on a vehicle located on a horizontal road surface. In addition, in the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system.

[0019] In the XYZ coordinate system, the Z-axis direction indicates the vertical direction (ie, the up-down direction), the +Z direction is the upper side (the opposite side to the gravity direction), and the -Z direction is the lower side (the gravity direction).

[0020] In addition, the X-axis direction is a direction perpendicular to the Z-axis direction, indicating the front-rear direction of the vehicle equipped with the drive device 1. The Y-axis direction is a direction perpendicular to both the X-axis direction and the Z-axis direction, indicating the width direction (left-right direction) of the vehicle. In the following description, the X-axis direction is sometimes referred to as the first direction, the Y-axis direction is sometimes referred to as the second direction, and the Z-axis direction is sometimes referred to as the third direction. The first direction, the second direction, and the third direction are directions perpendicular to each other.

[0021] In the following description, unless otherwise specified, the direction parallel to the central axis J1 of the motor 2 (Y-axis direction) is referred to as the "axial direction", the radial direction centered on the central axis J1 is referred to as the "radial direction", and the circumferential direction centered on the central axis J1, that is, the direction around the central axis J1 is referred to as the "circumferential direction". However, the above-mentioned "parallel direction" also includes a substantially parallel direction. In addition, in the following description, the +Y direction in the axial direction of the central axis J1 is sometimes referred to as the axial one side, and the -Y direction is sometimes referred to as the axial other side.

[0022] <Drive device>

[0023] Figure 1 It is a perspective view of the driving device 1 according to the present embodiment. Figure 2 This is a conceptual diagram of the driving device 1 according to the present embodiment.

[0024] The drive device 1 of the present embodiment is mounted on a vehicle using a motor as a power source, such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHV), or an electric vehicle (EV), and is used as the power source thereof.

[0025] like Figure 2 As shown, the drive device 1 includes a motor 2, a rotary transformer (sensor) 75, a temperature sensor (sensor) 76, a connector 8, a bearing holder 69, a power transmission unit 4, an inverter 7, and a housing 6. The housing 6 accommodates the motor 2, the rotary transformer 75, the temperature sensor 76, the bearing holder 69, the power transmission unit 4, and the inverter 7. Inside the housing 6, the motor 2, the power transmission unit 4, and the inverter 7 are arranged on the central axis J1.

[0026] <Motor>

[0027] The motor 2 of this embodiment is an inner rotor type three-phase AC motor. The motor 2 has both the function of an electric motor and the function of a generator. In addition, the structure of the motor 2 is not limited to this embodiment, and for example, it can also be an AC motor with four or more phases.

[0028] The motor 2 includes a rotor 20 rotatable about a central axis J1 extending in a second direction (Y-axis direction), and a stator 30 facing the rotor 20 in a radial direction.

[0029] The rotor 20 includes a motor shaft 21 , a rotor core 24 fixed to the outer peripheral surface of the motor shaft 21 , and a rotor magnet (not shown) fixed to the rotor core. The torque of the rotor 20 is transmitted to the power transmission unit 4 .

[0030] The motor shaft 21 extends in the axial direction around the central axis J1. The motor shaft 21 is rotatably supported by bearings 5A and 5B. The bearing 5A is supported by a bearing holder 69. The bearing 5B is supported by the housing 6.

[0031] A resolver rotor 75r of the resolver 75 is fixed to the end portion on one axial side (+Y side) of the motor shaft 21. In the present embodiment, the resolver rotor 75r is located on one axial side (+Y side) relative to the bearing 5A. The resolver rotor 75r rotates around the central axis J1 together with the motor shaft 21.

[0032] The stator 30 is held by the housing 6. The stator 30 surrounds the rotor 20 from the radially outer side. The stator 30 includes an annular stator core 32 centered on the central axis J1, a coil 31 mounted on the stator core 32, a lead wire 31a extending from the coil 31, and an insulator (not shown) interposed between the stator core 32 and the coil 31.

[0033] The stator core 32 has a plurality of magnetic pole teeth (not shown) radially inward from the inner circumference of the annular yoke. Coil wires are arranged between the magnetic pole teeth. The coil wires in the gaps between adjacent magnetic pole teeth constitute the coil 31. The insulator is made of an insulating material.

[0034] The lead wire 31a extends from the coil 31 to one side in the axial direction (+Y side). The stator 30 of the present embodiment has three lead wires 31a corresponding to the U phase, the V phase and the W phase. The lead wire 31a has a twisted conductor, a crimping terminal 31f crimped to the front end of the conductor, and an insulating tube (not shown) covering the outer periphery of the coil wire. The crimping terminal 31f is connected to the lead wire connecting portion 71a of the first bus bar 71 through a fixing component 71f. The fixing component 71f of the present embodiment is a terminal screw and a nut that tightens the crimping terminal 31f and the first bus bar 71 from the thickness direction. The nut of the fixing component 71f is held by a terminal block not shown.

[0035] <Inverter>

[0036] The inverter 7 is electrically connected to the motor 2. The inverter 7 is connected to a battery (not shown) mounted on the vehicle, converts a direct current supplied from the battery into an alternating current, and supplies the alternating current to the motor 2. The inverter 7 also controls the motor 2.

[0037] The inverter 7 of this embodiment is arranged on one axial side (+Y side) with respect to the motor 2. According to this embodiment, compared with the case where the inverter 7 is arranged radially outside the motor 2, the drive device 1 can be reduced in size in the radial direction.

[0038] The inverter 7 includes an inverter device body 7A, a first circuit board 7B, a second circuit board 7C, a first bus bar 71, and a second bus bar 72. The inverter device body 7A, the first circuit board 7B, and the second circuit board 7C are stacked in this order from one axial side (+Y side) toward the other axial side (-Y side).

[0039] The inverter device main body 7A has an inverter circuit that converts a DC power supply into an AC current. The inverter device main body 7A includes a switching element and a capacitor that smoothes the DC power supplied to the switching element. The switching element is, for example, an insulated gate bipolar transistor (IGBT).

[0040] The first circuit board 7B and the second circuit board 7C extend along a plane perpendicular to the central axis J1. The first circuit board 7B is a so-called power board. The inverter device main body 7A is connected to the first circuit board 7B.

[0041] The second circuit substrate 7C is connected to the first circuit substrate 7B. The second circuit substrate 7C is arranged at the end of the other axial side (-Y side) of the inverter 7. The first sensor connecting part (sensor connecting part) 75a and the second sensor connecting part (sensor connecting part) 76a are installed on the surface of the second circuit substrate 7C facing the motor 2 side (that is, the surface facing the other axial side (-Y side)). That is, the inverter 7 has the first sensor connecting part 75a and the second sensor connecting part 76a. The first sensor wiring (sensor wiring) 75b extending from the rotary transformer 75 is connected to the first sensor connecting part 75a. In addition, the second sensor wiring (sensor wiring) 76b extending from the temperature sensor 76 is connected to the second sensor connecting part 76a.

[0042] The first bus bar 71 and the second bus bar 72 are plate-shaped components made of a metal material with low electrical resistance. The material of the first bus bar 71 and the second bus bar 72 is, for example, copper. The first bus bar 71 and the second bus bar 72 are bent radially outward from the inverter device body 7A while extending toward the motor 2 side (i.e., the other axial side).

[0043] The first bus bar 71 connects the lead wire 31a of the motor 2 and the inverter device main body 7A. The inverter 7 of the present embodiment has three first bus bars 71 corresponding to the U phase, the V phase, and the W phase. The first bus bar 71 flows an alternating current.

[0044] The second bus bar 72 connects the power supply cable 9 and the inverter device main body 7A. The inverter 7 of the present embodiment has two second bus bars 72 corresponding to the positive pole and the negative pole. A direct current flows through the second bus bar 72 .

[0045] The first bus bar 71 has a lead wire connection portion 71a at the end portion on the other axial side (-Y side). The lead wire 31a extending from the coil 31 is connected to the lead wire connection portion 71a. That is, the inverter 7 has the lead wire connection portion 71a connected to the lead wire 31a.

[0046] The second bus bar 72 has a cable connection portion 72a at the end portion on the other axial side (-Y side). A power supply cable 9 extending from an external power source is connected to the cable connection portion 72a. That is, the inverter 7 has a cable connection portion 72a connected to the power supply cable 9. In the present embodiment, the external power source is a battery mounted on a vehicle. Two power supply cables 9 for the positive electrode and the negative electrode supply power from the battery to the inverter 7.

[0047] <Power transmission unit>

[0048] like Figure 2 As shown, the power transmission unit 4 is arranged on the other axial side (-Y side) relative to the motor 2. The power transmission unit 4 is connected to the rotor 20 and transmits the power of the motor 2 to the output shaft 47. The power transmission unit 4 has a reduction gear 4a and a differential device 4b. The torque output from the motor 2 is transmitted to the differential device 4b via the reduction gear 4a. The reduction gear 4a is a parallel axis gear type reducer in which the rotation axis of each gear is arranged in parallel. When the vehicle turns, the differential device 4b absorbs the speed difference between the left and right wheels while transmitting the torque to the left and right wheels.

[0049] The reduction gear 4a includes a first shaft 44, a second shaft 45, a first gear 41, a second gear 42, and a third gear 43. The differential device 4b includes a ring gear 46g, a differential case 46, and a differential mechanism 46c disposed inside the differential case 46. That is, the power transmission unit 4 includes a plurality of gears 41, 42, 43, and 46g.

[0050] The first shaft 44 extends axially with the central axis J1 as the center. The first shaft 44 is arranged coaxially with the motor shaft 21. The first shaft 44 is connected to the end of the motor shaft 21 on the other axial side (-Y side) at the end on one axial side (+Y side). The first shaft 44 rotates around the central axis J1 together with the motor shaft 21. The motor shaft 21 is rotatably supported by bearings 5C and 5D. The bearings 5C and 5D are supported by the housing 6.

[0051] The first gear 41 is provided on the outer peripheral surface of the first shaft 44. The first gear 41 rotates around the center axis J1 together with the first shaft 44. The second shaft 45 rotates around the intermediate axis J2 parallel to the center axis J1. The second gear 42 and the third gear 43 are arranged in parallel in the axial direction. The second gear 42 and the third gear 43 are provided on the outer peripheral surface of the second shaft 45. The second gear 42 and the third gear 43 are connected via the second shaft 45. The second gear 42 and the third gear 43 rotate around the intermediate axis J2. The second gear 42 meshes with the first gear 41. The third gear 43 meshes with the ring gear 46g of the differential device 4b.

[0052] The ring gear 46g rotates around the output axis J3 parallel to the central axis J1. The torque output from the motor 2 is transmitted to the ring gear 46g via the reduction gear 4a. The ring gear 46g is fixed to the differential case 46.

[0053] The differential case 46 includes: a case portion 46b, which accommodates the differential mechanism portion 46c inside; and a differential case shaft 46a, which protrudes to one side and the other side of the axial direction relative to the case portion 46b. That is, the power transmission unit 4 includes the differential case shaft 46a. The differential case shaft 46a is in a cylindrical shape extending in the axial direction with the output axis J3 as the center. The ring gear 46g is provided on the outer peripheral surface of the differential case shaft 46a. The differential case shaft 46a rotates together with the ring gear 46g with the output axis J3 as the center.

[0054] A pair of output shafts 47 are connected to the differential device 4b. The pair of output shafts 47 protrude from the differential case 46 of the differential device 4b to one side and the other side in the axial direction. The output shafts 47 are arranged inside the differential case shaft 46a. The output shafts 47 are rotatably supported on the inner peripheral surface of the differential case shaft 46a via bearings.

[0055] The torque output from the motor 2 is transmitted to the ring gear 46g of the differential device 4b via the first shaft 44, the first gear 41, the second gear 42, the second shaft 45, and the third gear 43 of the motor 2, and is output to the output shaft 47 via the differential mechanism portion 46c of the differential device 4b. The plurality of gears 41, 42, 43, 46g of the power transmission unit 4 transmit the power of the motor 2 in the order of the first shaft 44, the second shaft 45, and the differential case shaft 46a.

[0056] like Figure 1 As shown, the central axis J1, the intermediate axis J2, and the output axis J3 as the rotation center of the output shaft 47 are arranged in sequence from one side (+X side) to the other side (-X side) in the first direction (X-axis direction). The power transmission unit 4 transmits power to one side (+X) in the first direction in sequence.

[0057] <Bearing cage>

[0058] like Figure 2 As shown, the bearing holder 69 is arranged on one axial side (+Y side) relative to the motor 2 inside the housing 6. The bearing holder 69 holds the bearing 5A that supports the rotor 20 so that it can rotate. The bearing holder 69 of this embodiment is a plate-shaped member made of a metal material. The bearing holder 69 is formed by, for example, stamping. However, the structure and manufacturing method of the bearing holder 69 are not limited to this embodiment. The bearing holder 69 has a bearing holding portion 69e, a rotary transformer holding portion 69d, and a circular plate portion 69c.

[0059] The bearing holding portion 69e has a cylindrical shape extending along the central axis J1. The bearing holding portion 69e surrounds the bearing 5A from the radially outer side and holds the bearing 5A.

[0060] The disc portion 69c is roughly disc-shaped with the central axis J1 as the center. The disc portion 69c extends radially outward from the bearing retaining portion 69e. The bearing retainer 69 is fixed to the water jacket 6D of the housing 6 at the outer edge of the disc portion 69c. The disc portion 69c is provided with a first through hole 69a and a second through hole 69b that penetrate in the axial direction. The lead wire 31a extending from the coil 31 to the inverter 7 side passes through the first through hole 69a. The second sensor wiring 76b of the temperature sensor 76 passes through the second through hole 69b.

[0061] The resolver holding portion 69d is cylindrical and extends along the central axis J1. The resolver holding portion 69d is located axially on one side (+Y side) than the bearing holding portion 69e. The resolver holding portion 69d surrounds the resolver stator 75s of the resolver 75 from the radially outer side and holds the resolver stator 75s.

[0062] <Resolver>

[0063] The resolver 75 is a rotation sensor that measures the rotation angle of the rotor 20. That is, the resolver 75 is a sensor attached to the motor 2. The resolver 75 includes a resolver rotor 75r, a resolver stator 75s, and a first sensor wiring 75b.

[0064] The rotary transformer rotor 75r has a plurality of magnets arranged in the circumferential direction. The rotary transformer rotor 75r rotates around the central axis J1 together with the rotor 20. The rotary transformer stator 75s is fixed to the bearing holder 69. The rotary transformer stator 75s surrounds the rotary transformer rotor 75r from the radial outside. The rotary transformer stator 75s has a coil that is excited by the change of magnetic flux accompanying the rotation of the rotary transformer rotor 75r. The rotary transformer 75 measures the rotation angle of the rotor 20 based on the change of magnetic flux excited.

[0065] The first sensor wiring 75b connects the resolver stator 75s and the inverter 7. The first sensor wiring 75b supplies power to the resolver stator 75s from the inverter 7. The first sensor wiring 75b outputs the measurement result of the rotation angle of the rotor 20 by the resolver 75 to the inverter 7.

[0066] <Temperature sensor>

[0067] The temperature sensor 76 is attached to the coil 31 and measures the temperature of the coil 31. That is, the temperature sensor 76 is a sensor attached to the motor 2. The temperature sensor 76 has a second sensor wiring line 76b. The second sensor wiring line 76b outputs the measurement result of the coil temperature by the temperature sensor 76 to the inverter 7.

[0068] <Connector>

[0069] The connector 8 is attached to the housing 6. The connector 8 is fixed to a hole 83a provided in the housing 6. The hole 83a connects the inside and the outside of the housing 6.

[0070] A signal cable 3 extending from an external device is connected to the connector 8. The external device of this embodiment is a vehicle control device that controls the entire vehicle. The signal cable 3 connects the external device and the drive device 1, and transmits a control signal between the external device and the inverter 7.

[0071] The connector 8 includes a connector body 8b connected to the signal cable 3 and a signal line 8a extending from the connector body 8b. The connector body 8b is fixed to the housing 6 from the outside of the housing 6. The connector body 8b covers the opening of the hole 83a from the outside.

[0072] The signal line 8a passes through the hole 83a. The signal line 8a is connected to the second circuit board 7C at the end on the opposite side of the connector body 8b. That is, the signal line 8a is connected to the inverter 7 inside the housing 6.

[0073] <Casing>

[0074] The housing 6 has an inverter holder 6A, a housing body 6B, a gear cover 6C, and a water jacket 6D. The inverter holder 6A, the housing body 6B, the gear cover 6C, and the water jacket 6D are different components. The inverter holder 6A is arranged on one axial side (+Y side) of the housing body 6B. The gear cover 6C is arranged on the other axial side (-Y side) of the housing body 6B. The water jacket 6D is arranged inside the housing body 6B.

[0075] The housing body 6B accommodates the motor 2 and is open on one axial side (+Y side). The housing body 6B includes: an outer tube portion 65, which is cylindrical with the center axis J1 as the center; a partition wall portion 65a, which is arranged on the other axial side (-Y side) of the outer tube portion 65 and covers the opening on the other axial side of the outer tube portion 65; and a concave portion 65b, which is open on the other axial side (-Y side).

[0076] The partition wall portion 65a is provided with a shaft insertion hole 65h. A pair of bearings 5B, 5C and a sealing component 5S are arranged in the shaft insertion hole 65h. The bearing 5B supports the motor shaft 21, and the bearing 5C supports the first shaft 44. The motor shaft 21 and the first shaft 44 are connected to each other inside the shaft insertion hole 65h. The sealing component 5S is arranged between the two bearings 5B and 5C in the axial direction. The sealing component 5S seals between the inner circumferential surface of the shaft insertion hole 65h and the outer circumferential surface of the first shaft 44. In addition, the motor shaft 21 and the first shaft 44 can also be a single component.

[0077] The outer cylindrical portion 65 of the housing body 6B includes a motor surrounding portion 65e that surrounds the motor 2 from the radial outside and an inverter surrounding portion 65f that surrounds a portion of the inverter 7 from the radial outside. The motor surrounding portion 65e supports the stator 30 via the water jacket 6D. The inverter surrounding portion 65f is located on one axial side (+Y side) of the motor surrounding portion 65e.

[0078] The inverter surrounding portion 65f is provided with an opening portion 61 opened radially outward. The opening portion 61 is covered by a cover portion 61c. That is, the housing 6 has a cover portion 61c covering the opening portion 61. The cover portion 61c suppresses the intrusion of dust and moisture into the interior of the housing 6 through the opening portion 61. Thus, the motor 2 and the inverter 7 arranged inside the housing 6 can be protected from dust and the like. In particular, in the present embodiment, a sealing portion 61s is arranged between the opening portion 61 and the cover portion 61c. The sealing portion 61s seals between the opening portion 61 and the cover portion 61c, and can further suppress the intrusion of moisture and the like into the housing 6.

[0079] The inverter holder 6A holds the inverter 7. The inverter holder 6A is in the shape of a plate perpendicular to the central axis J1. The inverter holder 6A covers the opening on one axial side (+Y side) of the outer cylinder 65 of the housing body 6B. The inverter holder 6A is provided with a first flow path 91 for cooling the inverter 7. In addition, the inverter holder 6A is provided with a hole 83a. The connector 8 is mounted in the hole 83a.

[0080] The inverter holder 6A supports the inverter device body 7A by its surface facing the other axial side (-Y side). A plurality of support pillars 83b are provided on the surface of the inverter holder 6A facing the other axial side (-Y side). The support pillars 83b support the first circuit board 7B and the second circuit board 7C.

[0081] The water jacket 6D includes a cylindrical inner tube portion 64 centered on the central axis J1 and a flange portion 64 f located at one axial end of the inner tube portion 64 .

[0082] The inner cylinder 64 surrounds the stator 30 from the radially outer side. The inner diameter of the inner cylinder 64 is substantially consistent with the outer diameter of the stator core 32. The inner peripheral surface of the inner cylinder 64 contacts the outer peripheral surface of the stator 30. In addition, the inner cylinder 64 is surrounded by the outer cylinder 65 from the radially inner side. The outer diameter of the inner cylinder 64 is smaller than the inner diameter of the outer cylinder 65 of the housing body 6B. O-rings 10 are respectively arranged at both axial ends of the outer peripheral surface of the inner cylinder 64. The O-ring 10 seals between the outer peripheral surface of the inner cylinder 64 and the outer cylinder 65. A gap that functions as the third flow path portion 93 is provided between the inner cylinder 64 and the outer cylinder 65 and between a pair of O-rings 10.

[0083] The flange portion 64f extends radially outward from the inner tube portion 64. The water jacket 6D is fixed to the outer tube portion 65 of the housing body 6B at the flange portion 64f. In addition, the bearing holder 69 is fixed to the flange portion 64f. That is, the bearing holder 69 is fixed to the inner tube portion 64.

[0084] The housing 6 has a motor housing portion 81, a gear housing portion 82, and an inverter housing portion 83. The gear housing portion 82 is disposed on the other axial side (-Y side) of the motor housing portion 81. The inverter housing portion 83 is disposed on one axial side (+Y side) of the motor housing portion 81. The motor housing portion 81, the gear housing portion 82, and the inverter housing portion 83 are composed of each part of the inverter holder 6A, the housing body 6B, the gear cover 6C, and the water jacket 6D.

[0085] The motor housing portion 81 includes the motor surrounding portion 65e of the housing body 6B and the inner tube portion 64 of the water jacket 6D. The motor 2 is arranged radially inside the inner tube portion 64. The third flow path portion 93 is provided in the motor housing portion 81. The motor 2 is cooled by the fluid L in the third flow path portion 93.

[0086] The gear housing 82 is composed of the concave portion 65b of the housing body 6B and the gear cover 6C covering the opening of the concave portion 65b. The power transmission unit 4 is arranged in a space surrounded by the housing body 6B and the gear cover. Oil O is stored inside the gear housing 82. The oil O improves the lubricity of the power transmission unit 4 in the gear housing 82.

[0087] The inverter storage section 83 is composed of the inverter surrounding section 65f of the housing body 6B and the inverter holder 6A. The inverter 7 is supported by the inverter holder 6A. The various parts of the inverter 7 (the inverter device body 7A, the first circuit substrate 7B and the second circuit substrate 7C) are arranged radially inside the inverter surrounding section 65f of the housing body 6B. The first flow path section 91 is provided in the inverter storage section 83. The inverter 7 is cooled by the fluid L of the first flow path section 91.

[0088] In the present embodiment, the internal space of the motor housing portion 81 and the internal space of the gear housing portion 82 are divided by the partition wall portion 65a. In addition, a sealing member 5S is arranged inside the shaft insertion hole 65h provided in the partition wall portion 65a to restrict the movement of the oil O through the shaft insertion hole 65h. The partition wall portion 65a and the sealing member 5S prevent the oil O stored in the gear housing portion 82 from infiltrating into the internal space of the motor housing portion 81.

[0089] <Flow path>

[0090] The housing 6 is provided with a flow path 90 through which a fluid L flows. The fluid L is, for example, water or antifreeze. The flow path 90 includes a first flow path portion 91 , a second flow path portion 92 , a third flow path portion 93 , and a fourth flow path portion 94 .

[0091] The flow path 90 is connected to an external pipe 97 extending outside the housing 6. The external pipe 97 is connected to the inverter holder 6A at a first connection portion 97a and is connected to the housing body 6B at a second connection portion 97b. A radiator (not shown) for cooling the fluid L is arranged in the path of the external pipe 97.

[0092] The fluid L flows in the order of the first flow path 91, the second flow path 92, the third flow path 93, and the fourth flow path 94 inside the housing 6. The first flow path 91, the second flow path 92, and the fourth flow path 94 are holes mainly provided in the housing 6. The first flow path 91, the second flow path 92, and the fourth flow path 94 are formed by machining the wall of the housing 6 using a drill or the like. On the other hand, the third flow path 93 is provided between the inner tube 64 and the outer tube 65.

[0093] The first flow path portion 91 is provided in the inverter holder 6A. The first flow path portion 91 mainly extends along a plane perpendicular to the central axis J1. The first flow path portion 91 has a cooling portion 91b. The cooling portion 91b is provided between the recess and the inverter device body 7A covering the opening of the recess, and the recess is provided on the surface of the inverter holder 6A facing the other axial side (-Y side). The fluid L flowing in the cooling portion 91b contacts the inverter device body 7A and cools the inverter device body 7A.

[0094] The second flow path portion 92 is provided in the outer tube portion 65 of the case body 6B. The second flow path portion 92 connects the first flow path portion 91 and the third flow path portion 93. The second flow path portion 92 extends substantially in the axial direction.

[0095] The third flow path portion 93 is arranged between the outer tube portion 65 of the housing body 6B and the inner tube portion 64 of the water jacket 6D. A spiral protrusion portion 64a is provided on the outer peripheral surface of the inner tube portion 64. The protrusion portion 64a protrudes radially outward from the outer peripheral surface of the inner tube portion 64 and extends obliquely in the circumferential direction and the axial direction. The protrusion portion 64a divides the gap between the outer tube portion 65 and the inner tube portion 64 in a spiral shape. Thus, the third flow path portion 93 extends in a spiral shape in the circumferential direction. The fluid L flowing in the third flow path portion 93 cools the stator 30. In addition, in the present embodiment, the case where the third flow path portion 93 extends in a spiral shape is described. However, the third flow path portion 93 only needs to surround the stator 30 and is not limited to the present embodiment. For example, the third flow path portion 93 may also be a flow path that meanders in the axial direction or the circumferential direction.

[0096] The fourth flow path portion 94 is a hole portion provided in the outer tube portion 65 of the housing body 6B. The fourth flow path portion 94 extends in the radial direction. The fourth flow path portion 94 is connected to the third flow path portion 93 at the radially inner end portion and is connected to the second connection portion 97b of the external pipe 97 at the radially outer end portion. Figure 1 As shown in FIG. 1 , the second connection portion 97 b is located between the power supply cable 9 and the output axis J3 . That is, the outlet of the flow path 90 is arranged between the power supply cable 9 and the output axis J3 in the circumferential direction of the central axis J.

[0097] <Opening>

[0098] Figure 3 61 is a top view of the drive device 1 in the vicinity of the opening 61. Figure 4 6 is a cross-sectional view of the driving device 1 along a section line perpendicular to the central axis J1 and passing through the opening 61. Figure 3 In the figure, the cover portion 61c covering the opening portion 61 is omitted. Figure 4 In FIG. 1 , the second circuit board 7C is indicated by an imaginary line (two-dot chain line).

[0099] like Figure 3As shown, the opening portion 61 of the present embodiment opens radially outward relative to the center axis J1. In addition, the opening portion 61 of the present embodiment opens on the upper side (the side of the third direction). The opening portion 61 of the present embodiment is roughly rectangular with the axial direction as the short side when viewed from the front. The opening portion 61 is provided in the outer cylinder portion 65 of the housing 6. That is, the opening portion 61 radially penetrates the outer cylinder portion 65. The axial position of the opening portion 61 overlaps with the axial position of the inverter 7. More specifically, the axial position of the opening portion 61 overlaps with the second circuit substrate 7C, the lead wire connection portion 71a and the cable connection portion 72a of the inverter 7.

[0100] like Figure 3 As shown, the housing 6 has a protruding wall portion 61w protruding radially outward along the inner edge 61a of the opening portion 61. As described above, the opening portion 61 is substantially rectangular, so the protruding wall portion 61w has four wall portions 61wa, 61wb, 61wc, and 61wd corresponding to the respective sides of the opening portion 61. Two wall portions 61wa and 61wb of the four wall portions constituting the protruding wall portion 61w extend perpendicularly to the central axis J1 and face each other in the axial direction. In addition, the remaining two wall portions 61wc and 61wd of the four wall portions constituting the protruding wall portion 61w extend in the axial direction and face each other in the circumferential direction.

[0101] The wall portion 61wb on the other axial side (-Y side) of the two axially opposed wall portions 61wa and 61wb is provided with a through hole 62 penetrating in the thickness direction and a cable holding portion 62h. That is, the through hole 62 and the cable holding portion 62h are provided in the protruding wall portion 61w. In addition, the through hole 62 and the cable holding portion 62h are provided in the housing 6.

[0102] The through hole 62 penetrates the wall portion 61wb in the axial direction. The through hole 62 connects the external space of the housing 6 with the internal space of the housing 6. The power supply cable 9 passes through the through hole 62. In the wall portion 61wb of the present embodiment, two through holes 62 are provided for passing two power supply cables 9 for the positive and negative electrodes, respectively. The two through holes 62 are arranged along the first direction (X-axis direction). In addition, the two through holes 62 are arranged at the end of one side (+X side) of the first direction in the wall portion 61wb.

[0103] The cable holding portion 62h is disposed at the opening of the through hole 62. The cable holding portion 62h holds the power supply cable 9. The cable holding portion 62h fixes the power supply cable 9 to the protruding wall portion 61w, and suppresses load applied between the power supply cable 9 and the second bus bar 72 due to vibration or the like.

[0104] A crimping terminal 9f is provided at the front end of the power supply cable 9. The crimping terminal 9f is connected to the cable connection portion 72a of the second bus bar 72 via a fixing member 72f. The fixing member 72f of this embodiment is a terminal screw and a nut that fastens the crimping terminal 9f and the second bus bar 72 from the thickness direction. The nut of the fixing member 72f is held by a terminal block (not shown).

[0105] like Figure 3 As shown in FIG. 1 , the opening 61 is overlapped with the lead wire connection portion 71a, the cable connection portion 72a, the first sensor connection portion 75a, and the second sensor connection portion 76a in the radial direction of the central axis J1. Therefore, when the opening 61 is observed from the radial direction of the central axis J1, the lead wire connection portion 71a, the cable connection portion 72a, the first sensor connection portion 75a, and the second sensor connection portion 76a are arranged in the area surrounded by the inner edge 61a of the opening 61.

[0106] The lead wire connection portion 71a of this embodiment is axially arranged between the inverter 7 and the motor 2. According to this embodiment, the lead wire 31a can connect the inverter 7 and the motor 2 with the shortest distance, and can suppress the increase in resistance and the increase in size of the drive device 1 due to the increase in the wiring path.

[0107] According to the housing 6 of the present embodiment, the lead wire connection portion 71a can be exposed radially outward from the opening portion 61. An operator or an automatic assembly device (hereinafter, operator, etc.) can insert a tool or the like from the opening portion 61 to connect the lead wire 31a to the lead wire connection portion 71a. According to the present embodiment, an assembly method can be adopted in which the motor 2 and the inverter 7 are connected after the motor 2 and the inverter 7 are accommodated inside the housing 6. More specifically, after the motor 2 is fixed to the housing body 6B, the inverter 7 is fixed to the inverter holder 6A, and the housing body 6B and the inverter holder 6A are connected, the motor 2 and the inverter 7 can be connected inside the housing 6. By adopting such an assembly process, the process of assembling the motor 2 to the housing body 6B and the process of assembling the inverter 7 to the inverter holder 6A can be performed simultaneously and in parallel, and the efficiency of the assembly process can be achieved.

[0108] According to the present embodiment, the lead wire connection portion 71a, the cable connection portion 72a, the first sensor connection portion 75a, and the second sensor connection portion 76a are exposed to the outside of the housing 6 via the same opening portion 61. Therefore, it is not necessary to provide a plurality of opening portions in the housing 6, and the housing 6 can be miniaturized and simplified. Furthermore, in the assembly process, it is not necessary to open and close the plurality of opening portions, and the work required for opening and closing can be reduced. As a result, it is possible to provide a drive device 1 that can simplify the assembly process.

[0109] According to the present embodiment, the operator can continuously perform the connection process of all the lead wire connection parts 71a and the cable connection parts 72a by inserting the tool into the interior of the housing 6 from one opening 61, and can efficiently perform the operation. In addition, according to the present embodiment, only one opening 61 is provided, so it is easy to ensure that the opening area of ​​the opening 61 is large. By increasing the opening area of ​​the opening 61, the operability of the connection process can be improved. In addition, by increasing the opening area of ​​the opening 61, the automation of the process of the device such as a robot becomes easy.

[0110] The opening 61 of this embodiment opens radially outward. According to this embodiment, compared with the case where the opening 61 opens on one side in the axial direction, other components (in this embodiment, the inverter 7) can be arranged on one side in the axial direction relative to the motor 2. Thus, the components of the drive device 1 can be arranged in the axial direction, and the drive device 1 can be miniaturized in the radial direction.

[0111] According to the present embodiment, the first sensor connection portion 75a and the second sensor connection portion 76a can be exposed radially outward from the opening portion 61. An operator or the like can insert a tool or the like from the opening portion 61 to connect the first sensor wiring 75b and the second sensor wiring 76b to the first sensor connection portion 75a and the second sensor connection portion 76a, respectively. According to the present embodiment, an assembly process can be adopted in which the rotary transformer 75 and the temperature sensor 76 are pre-assembled to the motor 2 and finally connected to the inverter 7 inside the housing 6, thereby making it easy to simplify the assembly process.

[0112] According to the housing 6 of this embodiment, the cable connection portion 72a can be arranged inside the housing 6 and exposed radially outward from the opening 61. Therefore, compared with the case where the cable connection portion 72a is arranged outside the housing 6, it is not necessary to seal the cable connection portion 72a outside the housing 6, and the waterproof structure and dustproof structure of the drive device 1 can be simplified.

[0113] like Figure 4As shown, the cable connection portion 72a of the present embodiment is arranged at a position radially outward from the lead wire connection portion 71a, the first sensor connection portion 75a, and the second sensor connection portion 76a. In addition, when the opening portion 61 is observed from the radial outside, the cable connection portion 72a overlaps with the second sensor connection portion 76a. The connection of the power supply cable 9 to the inverter 7 is performed after the connection of other wirings and the like is completed. Therefore, even if the cable connection portion 72a overlaps with the radial outside of other connection portions (the lead wire connection portion 71a, the first sensor connection portion 75a, and the second sensor connection portion 76a), the connection process of other connection portions will not be hindered. In addition, by overlapping the cable connection portion 72a on the radial outside of other connection portions, the area exposed by the opening portion 61 can be effectively utilized, and the opening portion 61 can be reduced. As a result, the housing 6 can be miniaturized. In addition, in the present embodiment, the case where the cable connection portion 72a is overlapped and arranged on the radial outside of the second sensor connection portion 76a is described, but the cable connection portion 72a can also be arranged on the radial outside of other connection portions. That is, when viewing the opening 61 from the radially outer side, the cable connection portion 72a only needs to overlap with at least one of the lead wire connection portion 71a, the first sensor connection portion 75a, and the second sensor connection portion 76a.

[0114] In addition, according to the present embodiment, the through hole 62 through which the power supply cable 9 passes is provided in the protruding wall portion 61w extending along the inner edge 61a of the opening portion 61. Therefore, the operator can carry out the process of passing the power supply cable 9 from the opening portion 61 through the first through hole 69a and introducing the front end of the power supply cable 9 into the interior of the housing 6, and the introduction operation can be simplified. Furthermore, by providing the through hole 62 in the protruding wall portion 61w, the power supply cable 9 can be passed through the through hole 62 so that the crimping terminal 9f provided at the front end of the power supply cable 9 is located in front of the opening portion 61. Since the crimping terminal 9f is arranged in front of the opening portion 61, it is easy to carry out the connection operation between the crimping terminal 9f and the cable connecting portion 72a from the opening portion 61. Furthermore, according to this structure, the power supply cable 9 is supported by the inner edge of the through hole 62, so the position of the crimping terminal 9f is easy to stabilize, and the connection operation can be easily carried out. In addition, as Figure 4 As shown in the figure, by providing the through hole 62 in the protruding wall portion 61w, it is easy to arrange the crimping terminal 9f at a position radially outward of the lead wire connection portion 71a, the first sensor connection portion 75a, and the second sensor connection portion 76a. Therefore, as described above, it is easy to arrange the cable connection portion 72a in a manner overlapping with any of the lead wire connection portion 71a, the first sensor connection portion 75a, and the second sensor connection portion 76a in the radial direction.

[0115] like Figure 3As shown, the through hole 62 of this embodiment axially penetrates the wall portion 61wb extending perpendicularly to the central axis J1 among the wall portions constituting the protruding wall portion 61w. Figure 1 As shown, the power supply cable 9 can be wired axially outside the housing 6. As a result, the power supply cable 9 can be extended axially along the outer cylindrical portion 65 of the housing 6, and the drive device 1 including the power supply cable 9 can be miniaturized as a whole. In addition, in the present embodiment, the power supply cable 9 is fixed to the outer side surface of the housing 6 using a fixing tool 9a. By using the fixing tool 9a, the power supply cable 9 can be stably held, and interference with other components can be suppressed. In addition, it is not necessary to provide the fixing tool 9a to support the power supply cable 9.

[0116] like Figure 1 As shown, the through hole 62 of this embodiment is provided in the wall portion 61wb at the end portion on one side (+X side) in the first direction of the vehicle. That is, in this embodiment, the through hole 62 is arranged in the wall portion 61wb on the side away from the output shaft 47. According to this embodiment, by separating the power supply cable 9 from the output shaft 47, interference between the power supply cable 9 and the output shaft 47 can be prevented.

[0117] like Figure 3 As shown, an imaginary plane perpendicular to the center axis J1 is assumed, namely, an imaginary plane VP. The lead wire connection portion 71a, the cable connection portion 72a, the first sensor connection portion 75a, and the second sensor connection portion 76a of the present embodiment are arranged on the imaginary plane VP. That is, the axial positions of the respective connection portions (the lead wire connection portion 71a, the cable connection portion 72a, the first sensor connection portion 75a, and the second sensor connection portion 76a) overlap with each other on the imaginary plane VP. According to the present embodiment, even when the axial dimension of the opening portion 61 is reduced, by arranging the opening portion 61 on the imaginary plane VP, the respective connection portions can be exposed from the opening portion 61. That is, according to the present embodiment, the axial dimension of the opening portion 61 can be reduced, and as a result, the housing 6 can be miniaturized in the axial direction.

[0118] like Figure 2As shown, according to the present embodiment, the lead wire connection portion 71a, the cable connection portion 72a, the first sensor connection portion 75a, and the second sensor connection portion 76a are arranged between the inverter 7 and the motor 2 in the axial direction. In addition, the housing 6 includes: a housing body 6B, which is cylindrical and surrounds the motor 2 from the radially outer side; and an inverter holder 6A, which supports the inverter 7 and covers the opening on one axial side (+Y side) of the housing body 6B. In the present embodiment, the opening 61 is provided in the housing body 6B. After the motor 2 is assembled to the housing body 6B and the inverter 7 is assembled to the inverter holder 6A, the housing body 6B and the inverter holder 6A are combined. When the opening 61 is provided in the housing body 6B, at least a part of the inverter 7 is arranged inside the housing body 6B. Therefore, in the state before the housing body 6B and the inverter holder 6A are combined, the inverter 7 supported by the inverter holder 6A is largely exposed. Therefore, according to the present embodiment, it is easy to assemble the inverter 7 to the inverter holder 6A before the housing body 6B and the inverter holder 6A are combined. In addition, in the present embodiment, the case where the opening 61 is provided in the housing body 6B is exemplified, but the opening 61 may also be provided in the inverter holder 6A.

[0119] The first flow path portion 91 provided in the inverter holder 6A of the present embodiment is arranged along the protruding wall portion 61w near the first connecting portion 97a, and overlaps with the front end portion of the power supply cable 9 when viewed from the axial direction. That is, at least a portion of the flow path 90 is arranged along the edge of the opening portion 61, and overlaps with the cable connection portion 72a when viewed from the axial direction. According to the present embodiment, the cable connection portion 72a can be cooled by the fluid L flowing in the flow path 90, the degradation of the cable connection portion 72a and the crimping terminal 9f can be suppressed, and the reliability of power supply to the drive device 1 can be improved.

[0120] like Figure 3 As shown, the connector 8 of this embodiment is located on one axial side (+Y side) of the inverter 7. As described above, the inverter 7 of this embodiment is located on one axial side of the motor 2. According to this embodiment, the connector 8 can be arranged on the opposite side of the motor 2 relative to the inverter 7. Therefore, the signal cable 3 connected to the connector 8 does not extend in the radial direction relative to the drive device 1, and the drive device 1 can be prevented from being enlarged in the radial direction.

[0121] In addition, you can also Figure 3As shown by the imaginary line (double dotted line) in the figure, the connector 108 is mounted on the protruding wall portion 61w. The connector 108 has a connector body 108b and a signal line 108a extending from the connector body 108b in the same manner as the connector 8 described above. In addition, in this modified example, a hole portion 183a penetrating in the thickness direction is provided in one wall portion 61wd constituting the protruding wall portion 61w. The connector body 108b covers the opening of the hole portion 183a from the outside. The signal line 108a passes through the hole portion 183a and is connected to the second circuit substrate 7C. That is, the signal line 108a is connected to the inverter 7 inside the housing 6. According to this modified example, an operator or the like can carry out a process of introducing the signal line 108a from the side of the opening portion 61 into the hole portion 183a, which can simplify the assembly operation of the connector 108.

[0122] The various embodiments and modifications of the present invention have been described above, but each structure and combination thereof in each embodiment and modification is an example, and addition, omission, substitution and other changes of the structure can be made without departing from the scope of the gist of the present invention. In addition, the present invention is not limited by the embodiments.

[0123] For example, in the above-mentioned embodiment, the coil is a bendable wire mounted on the stator, and the lead wire extending from the coil has a structure formed by bundling a plurality of wires using a crimping terminal. However, the coil may also be a segmented coil composed of a flat wire with high rigidity, and the lead wire extending from the coil is also a flat wire. In addition, the lead wire may also be a bus bar connected to the wire of the coil and extending from the coil.

[0124] In the above-mentioned embodiment, the case where the opening provided in the housing is rectangular is described. However, the shape of the opening is not limited to a rectangular shape, and may be, for example, a circular shape, an elliptical shape, a polygonal shape, or the like.

[0125] In the above-mentioned embodiment, a resolver is exemplified as a sensor for measuring the rotation angle of a rotor, but other sensors such as a rotation sensor element for detecting a magnetic field of a sensor magnet may be used as the rotation sensor.

[0126] In addition, the present technology can adopt the following structures.

[0127] (1) A drive device comprising: a motor having a rotor rotatable about a central axis and a stator radially opposed to the rotor; a sensor mounted on the motor; an inverter electrically connected to the motor; and a housing accommodating the motor and the inverter, the stator having: a coil; and a lead wire extending axially from the coil, the inverter having a lead wire connecting portion connected to the lead wire, and having a cable connecting portion connected to a power supply cable extending from an external power source and a sensor connecting portion connected to a sensor wiring extending from the sensor, the housing being provided with: an opening portion opening radially outward relative to the central axis; and a through hole for passing the power supply cable, the opening portion being arranged to overlap with the lead wire connecting portion, the cable connecting portion and the sensor connecting portion radially of the central axis.

[0128] (2) The drive device according to (1), wherein the lead wire connection portion, the cable connection portion, and the sensor connection portion are arranged on the same virtual plane perpendicular to the central axis.

[0129] (3) A drive device according to (1) or (2), wherein the cable connection portion is arranged at a radially outer side than the lead wire connection portion and the sensor connection portion, and when the opening portion is observed from the radially outer side, the cable connection portion overlaps with at least one of the lead wire connection portion and the sensor connection portion.

[0130] (4) The drive device according to any one of (1) to (3), wherein the housing has a protruding wall portion that protrudes radially outward along an inner edge of the opening portion, and the through hole is provided in the protruding wall portion.

[0131] (5) The driving device according to (4), wherein the protruding wall portion includes a wall portion extending perpendicularly to the central axis, and the through hole penetrates the wall portion in the axial direction.

[0132] (6) A driving device according to (5), wherein the driving device has a power transmission part, which is connected to the rotor to transmit the power of the motor to the output shaft, the center axis and the output axis serving as the rotation center of the output shaft are arranged in sequence from one side to the other side in a first direction, and the through hole is provided in the wall portion at an end portion on one side of the first direction.

[0133] (7) The driving device according to any one of (4) to (6), wherein the protruding wall portion is provided with a cable holding portion for holding the power supply cable.

[0134] (8) A drive device according to any one of (4) to (7), wherein the drive device has a connector connected to a signal cable extending from an external device, the connector has a signal line connected to the inverter inside the housing, and the connector is fixed to a hole portion provided on the protruding wall portion.

[0135] (9) The drive device according to any one of (1) to (8), wherein a flow path is provided on the housing, at least a portion of the flow path is arranged along an edge of the opening portion and overlaps with the cable connecting portion when viewed from the axial direction.

[0136] (10) A drive device according to any one of (1) to (9), wherein the inverter is arranged on one side axially relative to the motor, the lead wire connecting portion, the cable connecting portion and the sensor connecting portion are arranged axially between the inverter and the motor, and the housing comprises: a housing body which is cylindrical and surrounds the motor from the radial outside; and an inverter retaining frame which supports the inverter and covers an opening on one side axially of the housing body, and the opening is provided on the housing body.

[0137] (11) The drive device according to any one of (1) to (10), wherein the inverter is arranged on one side in the axial direction relative to the motor, and the lead wire connecting portion is arranged between the inverter and the motor in the axial direction.

[0138] (12) A drive device according to (11), wherein the drive device has a connector connected to a signal cable extending from an external device, the connector has a signal line connected to the inverter inside the housing, and the connector is located on one axial side of the inverter.

[0139] (13) A drive device according to any one of (1) to (12), wherein the drive device has a power transmission part that is connected to the rotor and transmits the power of the motor to the output shaft, and the power transmission part is arranged on the other side of the motor in the axial direction.

[0140] Description of symbols

[0141] 1: drive device; 2: motor; 3: signal cable; 4: power transmission part; 6: housing; 6A: inverter holder; 6B: housing body; 7: inverter; 8, 108: connector; 8a, 108a: signal line; 9: power supply cable; 20: rotor; 30: stator; 31: coil; 31a: lead wire; 47: output shaft; 61: opening; 61a: inner edge; 61w: protruding wall; 61wa, 61wb, 61wc, 61wd: wall; 62: through hole; 62h: cable holding part; 7 1a: lead wire connection part; 72a: cable connection part; 75: rotary transformer (sensor); 75: rotation sensor (sensor); 75a: first sensor connection part (sensor connection part); 75b: first sensor wiring (sensor wiring); 76: temperature sensor (sensor); 76a: second sensor connection part (sensor connection part); 76b: second sensor wiring (sensor wiring); 83a, 183a: hole part; 90: flow path; J1: center axis; J3: output axis; VP: imaginary plane.

Claims

1. A driving device, comprising: A motor having a rotor rotatable about a central axis and a stator radially opposed to the rotor; a sensor mounted on the motor; an inverter electrically connected to the motor; as well as a housing that accommodates the motor and the inverter, The stator has: coil; and A lead wire extends axially from the coil. The inverter has a lead wire connection portion connected to the lead wire, a cable connection portion connected to a power supply cable extending from an external power source, and a sensor connection portion connected to a sensor wire extending from the sensor. The housing is provided with: an opening portion that opens radially outward relative to the central axis; and a through hole for the power supply cable to pass through, The opening portion is arranged so as to overlap with the lead wire connecting portion, the cable connecting portion, and the sensor connecting portion in a radial direction of the central axis.

2. The driving device according to claim 1, wherein: The lead wire connection portion, the cable connection portion, and the sensor connection portion are arranged on the same imaginary plane perpendicular to the central axis.

3. The driving device according to claim 1, wherein: The cable connection portion is arranged radially outward of the lead wire connection portion and the sensor connection portion. When the opening is viewed from the radially outer side, the cable connection portion overlaps with at least one of the lead wire connection portion and the sensor connection portion.

4. The driving device according to claim 1, wherein: The housing has a protruding wall portion protruding radially outward along the inner edge of the opening portion, The through hole is provided in the protruding wall portion.

5. The driving device according to claim 4, wherein: The protruding wall portion includes a wall portion extending perpendicularly to the central axis, The through hole penetrates the wall portion in the axial direction.

6. The driving device according to claim 5, wherein: The driving device includes a power transmission unit connected to the rotor to transmit the power of the motor to the output shaft. The central axis and the output axis which is the rotation center of the output shaft are arranged in sequence from one side toward the other side in the first direction, The through hole is provided in the wall portion at an end portion on one side in the first direction.

7. The driving device according to claim 4, wherein: The protruding wall portion is provided with a cable holding portion that holds the power supply cable.

8. The driving device according to claim 4, wherein: The driving device has a connector connected to a signal cable extending from an external device. The connector has a signal line connected to the inverter inside the housing, The connector is fixed to a hole portion provided in the protruding wall portion.

9. The driving device according to claim 1, wherein: A flow path is provided on the housing. At least a portion of the flow path is arranged along an edge of the opening portion, and overlaps with the cable connection portion when viewed in the axial direction.

10. The driving device according to claim 1, wherein: The inverter is arranged on one side of the motor in the axial direction. The lead wire connection portion, the cable connection portion, and the sensor connection portion are arranged between the inverter and the motor in the axial direction. The housing has: a housing body which is cylindrical and surrounds the motor from the radial outside; and an inverter holder that supports the inverter and covers an opening on one axial side of the housing body, The opening is provided on the housing body.

11. The driving device according to claim 1, wherein: The inverter is arranged on one side of the motor in the axial direction. The lead wire connection portion is arranged between the inverter and the motor in the axial direction.

12. The driving device according to claim 11, wherein: The driving device has a connector connected to a signal cable extending from an external device. The connector has a signal line connected to the inverter inside the housing, The connector is located at one axial side of the inverter.

13. The driving device according to claim 1, wherein: The driving device includes a power transmission unit connected to the rotor to transmit the power of the motor to the output shaft. The power transmission portion is arranged on the other axial side with respect to the motor.

Images