CN115949742A

CN115949742A - Parking lock device and motor unit having the same

Info

Publication number: CN115949742A
Application number: CN202310118552.1A
Authority: CN
Inventors: 松尾秀明; 竹下和美; 加藤明利
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2019-09-30
Filing date: 2020-09-27
Publication date: 2023-04-11
Also published as: JP2021055761A; JP7400308B2; CN112576746B; CN112576746A

Abstract

The invention provides a parking lock device and a motor unit having the same. The parking lock device includes: a parking gear that rotates about a first rotation axis; a parking pawl that has a projection that engages with the parking gear and that rotates about a second rotation axis along the first rotation axis; a parking lever having a cam member contacting the parking pawl and a lever main body through which the cam member is inserted; a sleeve member having one end of the rod body inserted into the through hole; a flange supporting the other end of the rod main body; and an actuator that moves the parking lever by rotating the drive flange. The parking pawl rotates between a first position where the protrusion engages with the parking gear and a second position where the protrusion is away from the parking gear.

Description

Parking lock device and motor unit having the same

The present application is a divisional application of the invention patent application having an application number of 202011030600.4, an application date of 2020, 9/27, and an invention name of "parking lock device and motor unit having the parking lock device".

Technical Field

The present invention relates to a parking lock device and a motor unit having the same.

Background

The parking lock device mounted on the vehicle is provided to prevent the wheel from being accidentally rotated when the shift lever is shifted to the parking position or when the parking button is manually operated. For example, when the shift lever is shifted to the parking position, the actuator is driven. The actuator rotates the flange to move the parking lever, thereby sliding the cam member of the parking lever and the parking pawl. Thereby, the parking pawl rotates. When the projection of the parking pawl enters the recess of the parking gear, the parking gear is locked. At the same time, the drive gear provided coaxially with the parking gear is also locked. In this case, the axle coupled to the drive gear via the other gear and the shaft cannot rotate. Therefore, for example, when the vehicle is stopped on a slope and the parking lock device is operated, the wheels do not rotate and the vehicle does not move backward along the slope. Such a parking lock device is disclosed in patent document 1, for example.

Patent document 1: japanese patent laid-open publication No. 2011-143893

In the parking lock device, depending on the stop position of the rotating parking gear, when the parking pawl rotates, the protruding portion of the parking pawl may collide with the protruding portion of the parking gear without entering the recessed portion of the parking gear. In this case, the parking pawl receives an impact. This impact is transmitted from the parking pawl to the parking lever, and is also transmitted to an actuator that drives the parking lever. As a result, the components constituting the parking lock device including the actuator may be damaged by the impact.

Disclosure of Invention

In view of the above problems, it is an object of the present invention to provide a parking lock device capable of reducing damage to components due to an impact caused by collision between a parking pawl and a parking gear when the parking pawl is rotated, and a motor unit including the parking lock device.

An exemplary parking lock device of the present invention includes: a parking gear that rotates about a first rotation axis; a parking pawl that has a projection that engages with the parking gear and that rotates about a second rotation axis along the first rotation axis; a parking lever having a cam member contacting the parking pawl and a lever main body through which the cam member is inserted; a sleeve member having a through hole that penetrates in a direction along the second rotation axis, and into which one end portion of the lever main body of the parking lever is inserted; a flange that supports the other end portion of the rod main body of the parking rod; and an actuator that rotationally drives the flange to move the parking lever in a direction crossing the through hole, wherein the parking pawl is rotated between a first position where the protrusion engages with the parking gear and a second position where the protrusion is away from the parking gear by movement of the cam member in accordance with the movement of the parking lever, and the through hole of the sleeve member is an elongated hole when viewed in a direction along the second rotation axis.

According to the above configuration, it is possible to reduce damage to the components due to an impact generated by collision of the parking pawl with the parking gear when the parking pawl rotates.

Drawings

Fig. 1 is a perspective view showing an external appearance of a motor unit according to an embodiment of the present invention.

Fig. 2 is a conceptual diagram of the motor unit.

Fig. 3 is a perspective view showing a schematic structure of the parking lock device when the parking pawl is in the first position.

Fig. 4 is a front view of the parking lock device of fig. 3 when viewed from the + Y direction toward the-Y direction.

Fig. 5 is a side view of the parking lock device of fig. 3 when viewed from the-X direction toward the + X direction.

Fig. 6 is a perspective view showing a main part of the parking lock device of fig. 3 in an enlarged manner.

Fig. 7 is a perspective view showing the structure of the parking lock device when the parking pawl is in the second position.

Fig. 8 is a front view of the parking lock device of fig. 7 when viewed from the + Y direction toward the-Y direction.

Fig. 9 is a side view of the parking lock device of fig. 7 when viewed from the-X direction toward the + X direction.

Fig. 10 is a perspective view of the parking lock device in a state where the protruding portion of the parking pawl collides with the protruding portion of the parking gear.

Fig. 11 is a front view of the parking lock device of fig. 10 when viewed from the + Y direction toward the-Y direction.

Fig. 12 is a side view of the parking lock device of fig. 10 when viewed from the-X direction toward the + X direction.

Fig. 13 is a perspective view of the parking lever with the parking pawl in the second position.

Fig. 14 is a perspective view of the parking lever with the parking pawl in the first position.

FIG. 15 is a perspective view of the sleeve member as viewed from the-Y direction side.

Fig. 16 is a perspective view of the sleeve member in a state where the positioning pin and the fixing member are attached.

Fig. 17 is an enlarged perspective view of the inside of the housing to which the sleeve member is fixed.

Fig. 18 is a perspective view showing the inside of the housing of fig. 17 with a sleeve member removed.

Fig. 19 is a perspective view of the flange in a state where the other end portion of the parking rod is supported.

Fig. 20 is a front view of the support plate of the flange as viewed from the + X direction.

Fig. 21 is a bottom view showing a state of the parking lever when the parking pawl is located at the first position as viewed from the-Z direction side.

Fig. 22 is a bottom view showing a state of the parking lever when the parking pawl is located at the second position as viewed from the-Z direction side.

Fig. 23 is a perspective view showing a schematic configuration of a parking lock device using a modification of the pawl urging member.

Fig. 24 (a) is an explanatory view of a modification of the pawl biasing member attached to the housing, fig. 24 (b) is an explanatory view showing a case where the modification of the pawl biasing member is attached to the housing, and fig. 24 (c) is an explanatory view showing a case where the pawl biasing member shown in the present embodiment is attached to the housing.

Description of the reference symbols

1: a motor unit; 2: a motor; 4: a reduction gear; 5: a differential device; 6: a housing; 7: a parking lock device; 42: a second gear (intermediate gear); 55: an axle; 71: a parking gear; 72: a parking claw; 72a: a protrusion portion; 72b: a cam sliding portion; 73: a parking lever; 73A: an end portion; 73B: the other end; 731: a cam member; 731a: a truncated cone cylindrical portion; 731a ₁ : a conical surface; 731b: a cylindrical portion; 731b ₁ : an outer peripheral surface; 732: a lever body; 74: a sleeve member; 74a: a through hole; 74b: a cam receiving portion; 74b ₁ : a concave surface; 75: a flange; 752a: an opening part; 77: an actuator; 101: a claw urging member; 102: a rotation preventing portion; 121: positioning pins; 122: a fixing member; j4: an intermediate axis (first axis of rotation); j6: a rotation axis (second rotation axis); t: a gap.

Detailed Description

Hereinafter, the motor unit 1 according to the exemplary embodiment of the present invention will be described in detail with reference to the drawings. Hereinafter, the direction of gravity will be defined based on the positional relationship when the motor unit 1 is mounted on a vehicle on a horizontal road surface, and the description will be given. In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction represents the vertical direction (i.e., the vertical direction), + Z direction is the upper side (the opposite side to the direction of gravity), and-Z direction is the lower side (the direction of gravity). The X-axis direction is a direction perpendicular to the Z-axis direction, and indicates the front-rear direction of the vehicle on which the motor unit 1 is mounted, + X direction is the front of the vehicle, and-X direction is the rear of the vehicle. In addition, the + X direction may be the vehicle rear direction and the-X direction may be the vehicle front direction. The Y-axis direction is a direction perpendicular to both the X-axis direction and the Z-axis direction, and is a vehicle width direction (left-right direction).

In the following description, unless otherwise specified, a direction (Y-axis direction) parallel to the motor axis J2 of the motor unit 1 is simply referred to as "axial direction", a radial direction about the motor axis J2 is simply referred to as "radial direction", and a circumferential direction about the motor axis J2, that is, a direction around the motor axis J2 is simply referred to as "circumferential direction". However, the "parallel direction" also includes a substantially parallel direction. The "vertical direction" also includes a substantially vertical direction.

In the present specification, "sliding" refers to sliding in a state of contact or sliding movement.

Fig. 1 is a perspective view showing an external appearance of a motor unit 1 according to an embodiment. Fig. 2 is a conceptual diagram of the motor unit 1. The motor unit 1 is mounted on a vehicle having at least 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). The motor unit 1 includes a motor 2, a reduction gear 4, a differential 5, a housing 6, a parking lock device 7, an inverter unit 8, and an oil passage 90. Fig. 2 is a conceptual diagram, and the arrangement and size of each portion are not necessarily the same as those of the actual motor unit 1. In addition, the inverter unit 8 is omitted from fig. 2 for convenience.

The outline of each part of the motor unit 1 is as follows. The motor 2 has a rotor 20 and a stator 30. The rotor 20 rotates about a motor axis J2 in the horizontal direction. The stator 30 is located radially outward of the rotor 20. The reduction gear 4 is connected to the rotor 20 of the motor 2. The differential device 5 is connected to the motor 2 via the reduction gear 4. A housing space 80 for housing the motor 2, the reduction gear 4, and the differential gear 5 is provided inside the housing 6.

The parking lock device 7 operates in conjunction with the operation of the shift lever or the operation of the parking button, and prevents the rotation of the wheel. For example, when the vehicle is stopped on a slope and stopped, the parking lock device 7 is operated to lock the wheels when the driver of the vehicle shifts the shift lever to a parking position or presses a parking button. This prevents the vehicle from moving backward down the slope. The inverter unit 8 is electrically connected to the motor 2 and controls the supply of current to the motor 2.

The oil passage 90 is a path for supplying the oil O stored in the region below the housing space 80 in the vertical direction to the motor 2. The oil O is used to lubricate the reduction gear 4 and the differential 5, and to cool the motor 2. The oil O has a function as a lubricating oil and a cooling oil. Therefore, it is preferable to use an oil equivalent to an Automatic Transmission lubricating oil (ATF) having a relatively low viscosity as the oil O. The oil passage 90 has a first oil passage 91 and a second oil passage 92.

In the present specification, the "oil passage" refers to a path of the oil O circulating in the housing space 80. Therefore, the "oil passage" is a concept as follows: the present invention includes not only a "flow path" that forms a stable flow of oil stably oriented in one direction, but also a path (for example, a reservoir) in which oil is temporarily retained and a path in which oil is dropped.

Hereinafter, the details of each part of the motor unit 1 will be described.

< 1. Shell >

The housing 6 holds the motor 2, the reduction gear 4, and the differential gear 5 in the housing space 80. The housing 6 has a partition wall 61c. The housing space 80 of the housing 6 is divided by a partition wall 61c into a motor chamber 81 and a gear chamber 82. The motor chamber 81 accommodates the motor 2. The gear chamber 82 houses the reduction gear 4 and the differential gear 5. In addition, a part of the parking lock device 7 is also housed in the gear chamber 82.

An oil reservoir P in which the oil O is stored is provided in a region below the housing space 80. In the present embodiment, the bottom 81a of the motor chamber 81 is located above the bottom 82a of the gear chamber 82. On the other hand, a partition wall opening 68 is provided in a region below the partition wall 61c. The partition wall opening 68 communicates the motor chamber 81 with the gear chamber 82. The oil O accumulated in the lower region of the motor chamber 81 moves to the gear chamber 82 through the partition wall opening 68. Therefore, in the present embodiment, the oil reservoir P is provided in a region below the gear chamber 82.

Part of the differential device 5 is immersed in the oil reservoir P. The oil O accumulated in the oil reservoir P is lifted by the operation of the differential device 5, a part of the oil is supplied to the first oil passage 91, and a part of the oil is diffused into the gear chamber 82. The oil O diffused into the gear chamber 82 is supplied to the gears of the reduction gear 4 and the differential gear 5 in the gear chamber 82, and the oil O spreads over the tooth surfaces of the gears. The oil O used for the reduction gear 4 and the differential gear 5 drops and is collected by the oil reservoir P located below the gear chamber 82. The capacity of the oil reservoir P of the housing space 80 is set to a level at which a part of the bearings of the differential device 5 is immersed in the oil O when the motor unit 1 is stopped.

The housing 6 is, for example, aluminum die-cast. The housing 6 constitutes an outer frame of the motor unit 1. The housing 6 has a motor housing 61, a gear housing 62, and a closing portion 63. The motor housing 61 is located between the gear housing 62 and the closing portion 63. The closing portion 63 is fixed to the motor housing portion 61 and closes the opening of the cylindrical motor housing portion 61.

The partition wall 61c of the motor housing portion 61 is provided with a through-insertion hole 61f through which the shaft 21 of the motor 2 is inserted, in addition to the partition wall opening 68. The motor housing 61 has a protruding plate portion 61d. The protruding plate portion 61d is disposed to protrude downward from the partition wall 61c. The protruding plate portion 61d is provided with a first axle passage hole 61e through which a drive shaft (not shown) for supporting a wheel passes.

The gear housing 62 is fixed to the motor housing 61, and constitutes a gear chamber 82 in which the reduction gear 4 and the like are housed. The gear housing 62 is provided with a second axle passage hole 62e. The second axle passage hole 62e overlaps with the first axle passage hole 61e as viewed in the axial direction of the axle 55.

The gear housing 62 has a first reservoir (reservoir) 93 and a shaft supply flow path 94. The first reservoir 93 receives the oil O lifted by the differential 5. The shaft supply flow path 94 is a flow path for supplying the oil O received by the first reservoir 93 to the inside of the hollow portion 22 of the shaft 21.

< 2. Reduction gear >

The reduction gear 4 has a function of reducing the rotation speed of the motor 2 and increasing the torque output from the motor 2 corresponding to the reduction ratio. The reduction gear 4 transmits the torque output from the motor 2 to the differential device 5.

The reduction gear 4 includes a first gear (motor gear) 41, a second gear (intermediate gear) 42, a third gear (final drive gear) 43, and a gear shaft 45. The gear ratio of each gear, the number of gears, and the like can be variously changed according to a required reduction ratio. The reduction gear 4 is a parallel shaft gear type reduction gear in which the shaft cores of the respective gears are arranged in parallel.

The first gear 41 is provided on the outer peripheral surface of the shaft 21 of the motor 2. The first gear 41 rotates together with the shaft 21 about the motor axis J2. The gear shaft 45 extends along an intermediate axis J4 parallel to the motor axis J2. The gear shaft 45 has a cylindrical shape centered on the intermediate axis J4, and rotates about the intermediate axis J4.

The second gear 42 and the third gear 43 are provided on the outer peripheral surface of the gear shaft 45. The second gear 42 and the third gear 43 are connected via a gear shaft 45 and rotate about the intermediate axis J4. The second gear 42 is meshed with the first gear 41. The third gear 43 meshes with the ring gear 51 of the differential device 5. The third gear 43 is located on the partition wall 61c side with respect to the second gear 42. In the present embodiment, the gear shaft 45 and the third gear 43 are one member. The second gear 42 and the third gear 43 may be integrally formed without providing the gear shaft 45.

< 3. Differential device

The differential device 5 is a device for transmitting the torque output from the motor 2 to the wheels of the vehicle. The differential device 5 has a function of transmitting the same torque to the axles 55 of the left and right wheels while absorbing a speed difference between the left and right wheels when the vehicle turns. The differential device 5 has a ring gear 51, a gear housing (not shown), a pair of pinion gears (not shown), a pinion shaft (not shown), and a pair of side gears (not shown).

The ring gear 51 rotates about a differential axis J5 parallel to the motor axis J2. The torque output from the motor 2 is transmitted to the ring gear 51 via the reduction gear 4. The gear housing houses a pair of pinions and a pair of side gears. When torque is transmitted to the ring gear 51, the gear housing rotates about the differential axis J5 together with the ring gear 51. The pair of pinions are bevel gears facing each other. The pair of pinions are supported by the pinion shaft. The pair of side gears are bevel gears vertically meshing with the pair of pinions. The pair of axles 55 are fitted to each of the pair of side gears. With the configuration of the differential device 5, the pair of axles 55 rotate around the differential axis J5 with the same torque.

< 4. Motor >

The motor 2 is an inner rotor type motor including a stator 30 and a rotor 20 rotatably disposed inside the stator 30. The torque of the motor 2 is transmitted to the differential device 5 via the reduction gear device 4.

(stator)

The stator 30 is held by the housing 6. The stator 30 includes a coil 31, a stator core 32, and an insulator (not shown). The stator core 32 has a plurality of magnetic pole teeth (not shown) extending radially inward from the inner circumferential surface of the annular yoke. The coil 31 is formed by winding a coil wire between the magnetic pole teeth. The coil wire is connected to the inverter unit 8 via a bus bar not shown. The insulator is interposed between the coil 31 and the stator core 32.

(rotor)

The rotor 20 includes a shaft 21, a rotor core 24, and a rotor magnet 25. The shaft 21 extends around a motor axis J2 extending in the horizontal direction and in the width direction of the vehicle (the direction perpendicular to the traveling direction of the vehicle). The shaft 21 is a hollow shaft having a hollow portion 22 therein. The hollow portion 22 has an inner peripheral surface extending along the motor axis J2. The rotor core 24 is formed by laminating silicon steel plates. The rotor core 24 is a cylindrical body extending in the axial direction, and surrounds the shaft 21 from the radially outer side. The rotor magnet 25 is a permanent magnet. In the present embodiment, a plurality of rotor magnets 25 are fixed to the rotor core 24 and arranged in the circumferential direction.

In the above configuration, when a current is supplied to the coil 31, a magnetic flux is generated in the stator core 32. The magnetic field generated by the magnetic flux of the stator core 32 and the magnetic field generated by the rotor magnet 25 act to generate a torque in the circumferential direction of the rotor 20. The rotor 20 rotates about the motor axis J2 by the torque.

The torque that rotates the motor 2 is transmitted to the ring gear 51 of the differential apparatus 5 via the shaft 21 of the motor 2, the first gear 41, the second gear 42, the gear shaft 45, and the third gear 43. Then, the pair of axles 55 coupled to the differential device 5 are rotated about the differential axis J5 by the torque. Thereby, the wheels connected to the pair of axles 55 rotate.

< 5. Oil path >

The oil passage 90 is located in the housing space 80 inside the casing 6. The oil passage 90 is formed across the motor chamber 81 and the gear chamber 82 of the housing space 80. The oil passage 90 is a path of the oil O that leads the oil O from the oil reservoir P (i.e., a region below the housing space 80) to the oil reservoir P again through the motor 2. The oil passage 90 has a first oil passage 91 passing through the inside of the motor 2 and a second oil passage 92 passing through the outside of the motor 2. The oil O cools the motor 2 from inside and outside in the first oil passage 91 and the second oil passage 92.

Both the first oil passage 91 and the second oil passage 92 are passages for supplying the oil O from the oil reservoir P to the motor 2 and returning the oil O to the oil reservoir P again for collection. In the first oil passage 91 and the second oil passage 92, the oil O drops from the motor 2 and is accumulated in a region below the motor chamber 81. The oil O stored in the area below the motor chamber 81 moves to the oil reservoir P, which is the area below the gear chamber 82, through the partition wall opening 68.

A cooler 97 for cooling oil O is provided in the path of second oil passage 92. The oil O that has passed through the second oil passage 92 and cooled by the cooler 97 merges with the oil O that has passed through the first oil passage 91 in the oil reservoir P. In the oil reservoir P, the oil O passing through the first oil passage 91 and the second oil passage 92 are mixed with each other, thereby performing heat exchange. Therefore, the effect of cooler 97 on cooling oil O passing through the path of second oil passage 92 can also affect oil O passing through first oil passage 91. That is, the oil O in both the first oil passage 91 and the second oil passage 92 can be cooled using the one cooler 97 provided in the second oil passage 92 which is one of the first oil passage and the second oil passage 92. Further, a cooler may be provided in the first flow path 91 to cool the oil O in both the oil paths.

The heat of the oil O is mainly dissipated through the cooler 97. Further, since the oil O is in contact with the inner surface of the casing 6, a part of the heat of the oil O is also radiated through the casing 6. As shown in fig. 2, a concave-convex heat sink 6b may be provided on the outer surface of the case 6. The radiator portion 6b promotes cooling of the motor 2 via the housing 6.

(first oil path)

In the first oil passage 91, the oil O is pumped up from the oil reservoir P by the differential device 5 and is guided to the inside of the rotor 20. Centrifugal force along with the rotation of the rotor 20 is applied to the oil O inside the rotor 20. Thereby, the oil O is uniformly diffused toward the stator 30 surrounding the rotor 20 from the radial outside, and cools the stator 30.

The first oil passage 91 has a lift path 91a, a shaft supply path 91b, a shaft inner path 91c, and a rotor inner path 91d. In addition, a first reservoir 93 is provided in a path of the first oil path 91. The first reservoir 93 is provided in the housing space 80, particularly in the gear chamber 82.

The lift path 91a is a path for lifting the oil O from the oil reservoir P by the rotation of the ring gear 51 of the differential device 5 and receiving the oil O from the first reservoir 93.

The first reservoir 93 is disposed on a side portion of the first gear 41. The first reservoir 93 is open on the upper side.

In the present specification, the "reservoir" refers to a structure having a function of accumulating oil in a state where there is no stable flow of liquid in one direction. The "reservoir" is different from the "flow path" in that there is no stable flow of the liquid.

The first reservoir 93 is located directly above the ring gear 51, the second gear 42 and the third gear 43. In fig. 2, for convenience, the first reservoir 93 is shown in a horizontally shifted position. The opening of the first reservoir 93 overlaps with the ring gear 51, the second gear 42, and the third gear 43 when viewed from the vertical direction. Most of the oil kicked up by the gear flies to the right above the gear to be kicked up. By disposing the first reservoir 93 directly above the ring gear 51, the second gear 42, and the third gear 43, the oil O lifted by the gears can be effectively received.

In the present embodiment, the differential axis J5, which is the rotation center of the ring gear 51, is disposed on the vehicle rear side with respect to the reduction gear 4. The oil O kicked up by the ring gear 51 of the differential gear 5 is poured to the upper side of the first reservoir 93 and accumulated in the first reservoir 93. That is, the first reservoir 93 receives the oil O kicked up by the ring gear 51. Further, immediately after the motor 2 is driven, when the liquid level of the oil reservoir P is high, the second gear 42 and the third gear 43 come into contact with the oil O in the oil reservoir P to lift the oil O. In this case, the first reservoir 93 receives the oil O lifted by the second gear 42 and the third gear 43 in addition to the oil O lifted by the ring gear 51.

The shaft supply path 91b guides the oil O from the first reservoir 93 to the motor 2. The shaft supply path 91b is constituted by a shaft supply flow path 94. The shaft supply flow path 94 extends from the first reservoir 93 toward the end of the shaft 21. The shaft supply flow path 94 guides the oil O stored in the first reservoir 93 from the end of the shaft 21 to the hollow portion 22.

The shaft inner path 91c is a path through which the oil O passes through the hollow portion 22 of the shaft 21. The rotor inner path 91d is a path through which the oil O enters the rotor core 24 from the shaft 21, passes through the inside of the rotor core 24 in the axial direction, and scatters toward the stator 30. That is, the first oil passage 91 has a path passing through the rotor core 24 from the inside of the shaft 21.

In the in-shaft path 91c, a centrifugal force accompanying rotation of the rotor 20 is applied to the oil O inside the rotor 20. Thereby, the oil O continuously scatters from the axial end of the rotor core 24 to the radial outside. Further, as the oil O is scattered, a negative pressure is generated in the path inside the rotor 20. Therefore, the oil O accumulated in the first reservoir 93 is sucked into the rotor 20, and the path inside the rotor 20 is filled with the oil O. The oil O is also promoted to move to the inside of the rotor 20 by the capillary force in the first oil passage 91. The oil O reaching the stator 30 takes heat from the stator 30.

(second oil circuit)

In the second oil passage 92, the oil O is sucked from the oil reservoir P to the upper side of the motor 2 and supplied to the motor 2. The oil O supplied to the motor 2 is transferred along the outer peripheral surface of the stator 30, and takes heat from the stator 30 to cool the motor 2. The oil O transferred along the outer circumferential surface of the stator 30 drops downward and is accumulated in a lower region of the motor chamber 81. The oil O in the second oil passage 92 and the oil O in the first oil passage 91 merge in a region below the motor chamber 81. The oil O stored in the lower region of the motor chamber 81 moves to the oil reservoir P, which is the lower region of the gear chamber 82, through the partition wall opening 68.

The second oil passage 92 has a first flow passage 92a, a second flow passage 92b, and a third flow passage 92c. A pump 96, a cooler 97, and a second reservoir 98 are provided in a path of the second oil passage 92. In the second oil passage 92, the oil O passes through the first flow passage 92a, the pump 96, the second flow passage 92b, the cooler 97, the third flow passage 92c, and the second reservoir 98 in this order, and is supplied to the motor 2.

The pump 96 is an electric pump driven by electricity. The pump 96 is mounted to the outer surface of the housing 6. The pump 96 has a suction port 96a and a discharge port 96b. The suction port 96a and the discharge port 96b are connected via an internal flow path of the pump 96. The suction port 96a is connected to the first flow path 92 a. The discharge port 96b is connected to the second flow path 92 b. The discharge port 96b is located above the suction port 96 a. The pump 96 sucks up the oil O from the oil reservoir P through the first flow path 92a, and supplies the oil O to the motor 2 through the second flow path 92b, the cooler 97, the third flow path 92c, and the second reservoir 98.

The supply amount of the oil O supplied to the motor 2 by the pump 96 is appropriately controlled according to the driving state of the motor 2. Therefore, in a case where a long-time drive or a high output is required, or the like, when the temperature of the motor 2 rises, the drive output of the pump 96 is increased, so that the supply amount of the oil O supplied to the motor 2 increases.

The cooler 97 has an inflow port 97a and an outflow port 97b. The inlet 97a and the outlet 97b are connected via an internal flow path of the cooler 97. The inlet 97a is connected to the second flow path 92 b. The outlet 97b is connected to the third flow path 92c. A cooling water pipe (not shown) through which cooling water supplied from the radiator directly or via the inverter unit 8 passes is provided inside the cooler 97. The oil O passing through the inside of the cooler 97 is cooled by heat exchange with the cooling water.

(second reservoir)

The second reservoir 98 is located in the motor chamber 81 of the receiving space 80. The second reservoir 98 is located on the upper side of the motor 2. The second reservoir 98 stores the oil O supplied to the motor chamber 81 via the third flow path 92c. Then, the second reservoir 98 supplies the stored oil O to each part of the motor 2 from the upper side via the outflow port. The oil O flows along the outer circumferential surface of the motor 2 from the upper side to the lower side, and takes heat from the motor 2. This enables the entire motor 2 to be cooled.

< 6. Inverter unit

The inverter unit 8 is electrically connected to the motor 2 and the pump 96, and controls the current supplied to the motor 2 and the pump 96. The inverter unit 8 is fixed to the case 6.

A refrigerant pipe extending from a radiator, not shown, is connected to the inverter unit 8. Then, the cooling water (refrigerant) that has cooled the inverter unit 8 is caused to flow into the cooler 97, and the oil O is cooled by the heat exchange between the cooling water and the oil O by the cooler 97. In the present embodiment, the oil O is cooled by the cooling water that cools the inverter unit 8, but the present invention is not limited to this. The oil O may be cooled by providing a pipe different from the refrigerant pipe for cooling the inverter unit 8.

< 7 parking lock apparatus >

(7-1. Outline of parking Lock device)

Fig. 3 is a perspective view showing a schematic configuration of the parking lock device 7. Fig. 4 is a front view of the parking lock device 7 when viewed from the + Y direction toward the-Y direction. Fig. 5 is a side view of the parking lock device 7 when viewed from the-X direction toward the + X direction. Fig. 6 is a perspective view showing a main part of the parking lock device 7 in an enlarged manner. The parking lock device 7 includes a parking gear 71, a parking pawl 72, a parking lever 73, a sleeve member 74, a flange 75, a manual shaft 76, an actuator 77, a pawl shaft 78, a restricting member 79, a pawl urging member 101, and a rotation blocking portion 102.

The parking gear 71 is provided on the outer peripheral surface of the gear shaft 45 together with the second gear 42 and the third gear 43 shown in fig. 2. Therefore, the parking gear 71 rotates about the intermediate axis J4 together with the second gear 42 and the third gear 43. The intermediate axis J4 constitutes a first rotation axis arranged parallel to the Y direction. That is, the parking device 7 has the parking gear 71 that rotates about the first rotation axis. The parking gear 71 has convex portions 71a and concave portions 71b alternately arranged in the circumferential direction of the intermediate axis J4.

The parking pawl 72 rotates about the rotation axis J6. The rotation axis J6 is a second rotation axis arranged along the intermediate axis J4. The rotation axis J6 coincides with the central axis of the pawl shaft 78. The pawl shaft 78 is provided so as to penetrate the parking pawl 72 in the Y direction.

The parking pawl 72 has a projection 72a. The protruding portion 72a is located away from the rotation axis J6 in the parking pawl 72. When the parking pawl 72 rotates about the rotation axis J6, the projection 72a engages with the recess 71b of the parking gear 71, thereby meshing with the parking gear 71. That is, the parking lock device 7 includes a parking pawl 72 that rotates about a second rotation axis along the first rotation axis, and the parking pawl 72 includes a projection 72a that engages with the parking gear 71.

The parking pawl 72 has a cam sliding portion 72b. The cam sliding portion 72b slides on a cam member 731 of the parking lever 73, which will be described later. In particular, when the parking lever 73 moves in a direction crossing a through hole 74a of the sleeve member 74, which will be described later, the cam sliding portion 72b slides with the cam member 731. That is, the parking pawl 72 has a cam sliding portion 72b that slides with the cam member 731 when the parking lever 73 moves in a direction crossing the through hole 74a. Here, the "direction crossing the through hole 74 a" refers to a direction crossing the ZX plane. Therefore, the "direction crossing the through-hole 74 a" includes a direction parallel to the Y axis and a direction inclined with respect to the Y axis.

The parking lever 73 has a cam member 731, a lever main body 732, and a coil spring 733. The parking lever 73 extends from the one end 73A in a direction parallel to the rotation axis J6, bends downward (-Z direction), and bends the lower end in the + X direction. The cam member 731 contacts the cam sliding portion 72b of the parking pawl 72. The cam member 731 is inserted through the lever main body 732. That is, the parking lock device 7 has a parking lever 73, and the parking lever 73 has a cam member 731 that contacts the parking pawl 72 and a lever body 732 through which the cam member 731 is inserted. The rod main body 732 is covered with a cylindrical cover 73C on the side of the one end 73A. The cover 73C prevents the cam member 731 from falling off the lever main body 732. The coil spring 733 is inserted through the lever main body 732, and urges the cam member 731 toward the one end 73A of the lever main body 732.

The sleeve member 74 has a through hole 74a. The through hole 74a is a hole that penetrates the sleeve member 74 in the direction along the rotation axis J6. The one end 73A of the lever main body 732 of the parking lever 73 is inserted into the through hole 74a. That is, the parking lock device 7 includes the sleeve member 74, and the sleeve member 74 has the through hole 74a that penetrates in the direction along the second rotation axis, and the one end 73A of the lever main body 732 of the parking lever 73 is inserted into the through hole 74a.

In the present embodiment, the through-hole 74a is a long hole when viewed from the + Y direction side. That is, the through hole 74a is an elongated hole when viewed from the direction along the rotation axis J6. The long hole extends along the P direction in which the cam member 731 presses the cam sliding portion 72b in the ZX plane by the cam member 731 sliding with the cam sliding portion 72b in accordance with the movement of the parking lever 73. That is, the through hole 74a of the sleeve member 74 is an elongated hole extending in the following direction: this direction is a direction in which the cam member 731 slides on the cam sliding portion 72b in accordance with the movement of the parking lever 73, and the cam member 731 presses the cam sliding portion 72b in a plane perpendicular to the rotation axis J6.

The flange 75 supports the parking rod 73. In particular, the flange 75 supports the other end 73B of the lever main body 732. That is, the parking lock device 7 has a flange 75 that supports the other end 73B of the lever main body 732 of the parking lever 73.

The flange 75 has a rotating plate 751 and a support plate 752. The rotation plate 751 is coupled to the manual shaft 76 and rotates along YZ plane with the manual shaft 76 as an axis. The support plate 752 is coupled to the rotation plate 751 and rotates integrally with the rotation plate 751 along the YZ plane.

The support plate 752 has an opening 752a. The other end 73B of the parking lever 73 is inserted into the opening 752a. Thus, the other end 73B of the parking lever 73 is supported by the support plate 752. The other end 73B of the parking lever 73 is supported by the support plate 752 at a position offset from the rotation axis of the flange 75, i.e., the rotation axis of the manual shaft 76, in the YZ plane.

The manual shaft 76 is a shaft that serves as a rotation axis of the flange 75, and is coupled to the flange 75. The rotational axis of the manual shaft 76 is arranged along the X direction. Therefore, when the manual shaft 76 is rotated, the flange 75 is rotated along the YZ plane.

The actuator 77 is a driving mechanism for rotating the flange 75 via the manual shaft 76. The rotation angle at which the actuator 77 rotates the flange 75 is set in advance in two ways. The actuator 77 is driven in response to a control signal from a control unit, not shown, and rotates the flange 75 through the manual shaft 76 by either one of two rotational angles.

For example, the actuator 77 rotates the flange 75 by one rotation angle, thereby moving the parking lever 73 supported by the flange 75 by a predetermined amount in one direction crossing the through hole 74a of the sleeve member 74. Thereby, the cam member 731 moves to push up the parking pawl 72, and the parking pawl 72 can be rotated to the first position.

On the other hand, the actuator 77 rotates the flange by another rotation angle, thereby moving the parking rod 73 supported by the flange 75 by a predetermined amount in the direction opposite to the above. This releases the push-up of the parking pawl 72 by the cam member 731, and allows the parking pawl 72 to rotate to the second position.

Therefore, the parking pawl 72 can be rotated between the first position and the second position by the rotation of the flange 75 by the actuator 77. Here, the first position is a position where the projection 72a of the parking pawl 72 engages with the parking gear 71. The second position is a position where the projection 72 is away from the parking gear 71. Fig. 3 to 5 show the state in which the parking pawl 72 is rotated to the first position, respectively.

Thus, the parking lock device 7 includes an actuator 77 that moves the parking rod 73 in a direction crossing the through hole 74a by rotating the drive flange 75. Then, the parking pawl 72 rotates between a first position where the projection 72a engages with the parking gear 71 and a second position where the projection 72a is spaced apart from the parking gear 71 by the movement of the cam member 731 in accordance with the movement of the parking lever 73.

The regulating member 79 has a roller 79a and a supporting member 79b. The roller 79a slides on the outer peripheral surface of the rotating plate 751 of the flange 75 to restrict the rotation of the flange 75. The support member 79b is a plate spring elastically supporting the roller 79 a. The end of the support member 79b opposite to the roller 79a is fixed to the inside of the casing 6 by a fixing tool 111 made of, for example, a bolt.

Here, the rotating plate 751 of the flange 75 has a first concave portion 751a and a second concave portion 751b. When the parking pawl 72 rotates to the first position according to the rotation of the flange 75, the roller 79a of the regulating member 79 is fitted into the first concave portion 751a. When the parking pawl 72 rotates to the second position according to the rotation of the flange 75, the roller 79a is fitted into the second concave portion 751b.

The first concave portion 751a and the second concave portion 751b have asymmetric shapes when viewed from the X direction. Specifically, the convex portion 751c is located between the first concave portion 751a and the second concave portion 751b. The first concave portion 751a is separated from the second concave portion 751b by a convex portion 751 c. The peak of the convex portion 751c is located closer to the first concave portion 751a than the second concave portion 751b. This realizes the above-described asymmetric shape of the first concave portion 751a and the second concave portion 751b. In the above-described asymmetric shape, the inclined surface on the convex portion 751c side of the second concave portion 751b is relatively gentler than the inclined surface on the convex portion 751c side of the first concave portion 751a. Therefore, the roller 79a is easily disengaged from the second concave portion 751b and not easily disengaged from the first concave portion 751a with respect to the rotation of the flange 75.

The pawl biasing member 101 is a coil spring that biases the parking pawl 72 in a direction of rotating from the first position to the second position in a plane perpendicular to the rotation axis J6, that is, a ZX plane. The pawl urging member 101 is wound around the outer peripheral surface of the pawl shaft 78. Further, one end portion 101a of the pawl urging member 101 is inserted into the hole 72c of the parking pawl 72. The other end 101b of the pawl urging member 101 is attached to the housing 6. Thereby, the pawl urging member 101 can urge the parking pawl 72 in the direction rotating from the first position to the second position.

When the parking pawl 72 rotates to the second position, the rotation preventing portion 102 abuts against the parking pawl 72, thereby preventing the parking pawl 72 from further rotating by the biasing force of the pawl biasing member 101. The rotation preventing portion 102 is formed of a shaft extending in the Y direction. The rotation preventing portion 102 is fixed to the housing 6.

As is apparent from the above description, the parking lock device 7 can be represented as follows. That is, the parking lock device 7 includes: a pawl biasing member 101 that biases the parking pawl 72 in a direction of rotating from the first position to the second position within a plane perpendicular to the second rotation axis; and a rotation preventing portion 102 that abuts against the parking pawl 72 when the parking pawl 72 rotates to the second position, thereby preventing the parking pawl 72 from rotating by the biasing force of the pawl biasing member 101.

(7-2. Action relating to parking lock device)

Fig. 7 is a perspective view showing the structure of the parking lock device 7 when the parking pawl 72 is in the second position. Fig. 8 is a front view of the parking lock device 7 of fig. 7 when viewed from the + Y direction toward the-Y direction. Fig. 9 is a side view of the parking lock device 7 of fig. 7 when viewed from the-X direction toward the + X direction.

In a state where the parking pawl 72 is located at the second position, the roller 79a of the restricting member 79 is fitted into the second concave portion 751b of the rotating plate 751. Thereby, the rotation of the flange 75 is prevented, and thus the parking pawl 72 is stably held in the second position.

When the driver of the vehicle shifts the shift lever to the parking position or manually turns on the parking button, the actuator 77 is driven in accordance with a control signal from a control unit, not shown. When the actuator 77 rotates the flange 75 by a predetermined angle in the counterclockwise direction when viewed from the + X direction (clockwise direction when viewed from the-X direction) in accordance with the control signal, the roller 79a of the regulating member 79 is disengaged from the second concave portion 751b and fitted into the first concave portion 751a as shown in fig. 5.

At this time, the parking lever 73 is supported by the flange 75 at a position offset from the rotation axis of the flange 75, that is, the center axis of the manual shaft 76, within the YZ plane. Therefore, the parking lever 73 is pushed out in the + Y direction by the rotation of the flange 75. Thereby, the cam member 731 of the parking lever 73 slides on the cam sliding portion 72b of the parking pawl 72b, and pushes up the parking pawl 72. Then, as shown in fig. 3 to 5, the projection 72a of the parking pawl 72 enters the recess 71b of the parking gear 71. Therefore, the parking pawl 72 is rotated to the first position. In this state, the parking gear 71 is locked by the parking pawl 72.

When the parking gear 71 is locked, the gears for transmitting the driving force provided coaxially with the parking gear 71, that is, the second gear 42 and the third gear 43 shown in fig. 2 are also locked. The wheels of the vehicle are coupled to the differential device 5 via an axle 55. In addition, the ring gear 51 of the differential device 5 meshes with the third gear 43. Therefore, even if the vehicle is going to retreat by the influence of gravity on a slope, the second gear 42 and the third gear 43 are locked, and therefore the wheels do not rotate, and the vehicle does not retreat.

Next, when the driver of the vehicle shifts the shift lever to the D (drive) range or manually turns off the parking button, the actuator 77 is driven in accordance with a control signal from a control unit (not shown). When the actuator 77 rotates the flange 75 by a predetermined angle in the clockwise direction when viewed from the + X direction (counterclockwise the flange 75 when viewed from the-X direction) in accordance with the control signal, the roller 79a of the regulating member 79 is disengaged from the first concave portion 751b and fitted into the second concave portion 751b as shown in fig. 9.

At this time, since the parking lever 73 is supported by the flange 75 at a position offset from the rotation axis of the flange 75 in the YZ plane as described above, the parking lever is pulled back in the-Y direction by the rotation of the flange 75. Therefore, the cam member 731 of the parking lever 73 also moves to the-Y direction side, and the push-up of the cam sliding portion 72b by the cam member 731 is released. Further, the pawl urging member 101 causes an urging force to act on the parking pawl 72 in a direction rotating from the first position to the second position. Thus, the parking pawl 72 rotates from the first position toward the second position. Then, when the parking pawl 72 abuts against the rotation preventing portion 102, the rotation of the parking pawl 72 is stopped. Thereby, the parking pawl 72 is held in the second position.

In a state where the parking pawl 72 is located at the second position, the locking of the parking gear 71 by the parking pawl 72 is released. Thereby, the second gear 42 and the third gear 43 provided coaxially with the parking gear 71 can be rotated. Therefore, when the motor 2 is rotated, the torque of the motor 2 is transmitted to the axle 55 via the first gear 41, the second gear 42, the third gear 43, and the differential device 5, respectively. As a result, the wheels coupled to the axle 55 can be rotated to run the vehicle.

As described above, the parking lock device 7 of the present embodiment includes the pawl biasing member 101 and the rotation preventing portion 102. In this configuration, when the parking pawl 72 rotates from the first position to the second position, the rotation preventing portion 102 can prevent the parking pawl 72 from being excessively rotated beyond the second position by the biasing force of the pawl biasing member 101. This can minimize the rotation range of the parking pawl 72 between the first position and the second position.

(7-3. Effect on the shape of the through hole formed by the sleeve member)

Fig. 10 is a perspective view of the parking lock device 7 in a state where the protruding portion 72a of the parking pawl 72 collides with the convex portion 71a of the parking gear 71. Fig. 11 is a front view of the parking lock device 7 of fig. 10 when viewed from the + Y direction toward the-Y direction. Fig. 12 is a side view of the parking lock device 7 of fig. 10 when viewed from the-X direction toward the + X direction.

In the process of rotating the parking pawl 72 from the second position to the first position, depending on the stop position of the rotating parking gear 71, as shown in fig. 10 to 12, the projection 72a of the parking pawl 72 may collide with the projection 71a without entering the recess 71b of the parking gear 71. When the protruding portion 72a collides with the convex portion 71a, the parking pawl 72 receives an impact. The impact is transmitted from the parking pawl 72 to the parking lever 73, and further, to the actuator 77 via the manual shaft 76. As a result, the components constituting the parking lock device 7 including the actuator 77 may be damaged by the impact.

Further, while the parking pawl 72 is rotated from the second position to the first position, the flange 75 is rotated by the actuator 77, and as shown in fig. 12, the roller 79a of the restricting member 79 is disengaged from the second concave portion 751b and fitted into the first concave portion 751a. Then, the parking lever 73 is pushed out to the + Y direction side by the rotation of the flange 75. However, the parking pawl 72 cannot rotate toward the first position due to the collision of the projection 72a with the projection 71 a. Therefore, even if the parking lever 73 is pushed out to the + Y direction side, the cam member 731 does not move to the + Y direction side and pushes up the parking pawl 72. In this case, the coil spring 733 that biases the cam member 731 contracts, so that the cam member 731 does not push up the parking pawl 72, and is maintained in a state of contact with the cam sliding portion 72b.

In the present embodiment, as shown in fig. 4 and the like, the through hole 74a of the sleeve member 74 through which the lever main body 732 of the parking lever 73 penetrates is an elongated hole when viewed from the + Y direction along the rotation axis J6. In this configuration, when the projection 72a of the parking pawl 72 collides with the projection 71a of the parking gear 71 and the parking lever 73 receives an impact, the lever body 732 is movable in the long hole of the through hole 74a. Such movement of the lever main body 732 can absorb or alleviate the impact applied to the parking lever 73. As a result, damage to the components due to the impact can be reduced.

When the lever main body 732 moves in the elongated hole, the cam member 731 and the sleeve member 74 slide, and can move in the-Y direction against the biasing force of the coil spring 733. That is, the cam member 731 is biased in the + Y direction by the coil spring 733, and thus, when an impact is applied, the cam member 731 can be moved in the-Y direction and the lever main body 732 can be moved in the elongated hole.

In particular, in the present embodiment, as shown in fig. 4 and 6, the through hole 74a of the sleeve member 74 is a long hole extending in the P direction in the ZX plane perpendicular to the rotation axis J6. As described above, the P direction is a direction in which the cam member 731 slides on the cam sliding portion 72b in accordance with the movement of the parking lever 73, and the cam member 731 presses the cam sliding portion 72b in the ZX plane. When the projection 72a of the parking pawl 72 collides with the convex portion 71a of the parking gear 71, the impact received by the parking lever 73 via the parking pawl 72 is applied in the direction opposite to the above-described P direction. The through hole 74a is a long hole extending in the P direction, and thus when the impact is applied to the parking lever 73, the lever main body 732 moves in the opposite direction along the long hole. By such movement of the lever main body 732, the parking lever 73 can effectively absorb or alleviate the impact.

(7-4. Details of parking rod)

Next, the parking lever 73 will be described in detail. Fig. 13 and 14 are perspective views of the parking lever 73 in a state where the one end portion 73A is inserted into the through hole 74a of the sleeve member 74. In particular, fig. 13 is a perspective view of the parking lever 73 in a state where the parking pawl 72 is located at the second position. Fig. 14 is a perspective view of parking lever 73 in a state where parking pawl 72 is located at the first position.

(cam member)

The cam member 731 of the parking lever 73 has a circular truncated cone cylindrical portion 731a andand a cylindrical portion 731b. The truncated cone cylinder portion 731a has a tapered surface 731a ₁ . Tapered surface 731a ₁ The outer peripheral surface of the truncated cone cylinder portion 731a has an outer diameter that increases from the one end portion 73A side toward the other end portion 73B side of the lever main body 732. The cylindrical portion 731B is coupled to the truncated cone cylindrical portion 731a on the other end 73B side. The cylindrical portion 731b has an outer peripheral surface 731b ₁ . Outer peripheral surface 731b ₁ The surface has the same outer diameter as the maximum outer diameter of the truncated cone cylinder portion 731 a. That is, the cam member 731 has a truncated cone cylinder portion 731a and a cylinder portion 731B, and the truncated cone cylinder portion 731a has a tapered surface 731a whose outer diameter increases from the one end portion 73A side toward the other end portion 73B side of the lever main body 732 ₁ The cylindrical portion 731B is connected to the truncated cone cylindrical portion 731a on the other end 73B side of the lever main body 732, and has an outer peripheral surface 731B having the same outer diameter as the maximum outer diameter of the truncated cone cylindrical portion 731a ₁ 。

(rod body)

The lever main body 732 of the parking lever 73 has a first lever 732a, a second lever 732b, and a third lever 732c. The third rod 732c connects the first rod 732a and the second rod 732b.

The first rod 732a linearly extends in a direction crossing the ZX plane. The one end 73A of the lever main body 732 is an end of the first lever 732a opposite to the side connected to the third lever 732c. The cam member 731 is inserted through the first lever 732a. The first rod 732a is inserted into the through hole 74a of the sleeve member 74.

The second rod 732b linearly extends in a direction crossing the YZ plane. The other end 73B of the lever main body 732 is an end of the second lever 732B opposite to the side connected to the third lever 732c. The second rod 732b is inserted into the opening 752a of the support plate 752 of the flange 75 and supported by the support plate 752.

In a state where the parking pawl 72 is located at the first position, the third lever 732c extends in the + Z direction from the connection side with the second lever 732b, extends in the + Z direction while slightly bending in the + X direction, and then bends in the + Y direction to be connected to the first lever 732a. The third lever 732c has an overlapping portion 732v ₁ . As shown in fig. 5 and 9, the overlapping portion 732v is viewed from the axial direction of the manual shaft 76, that is, for example, from the-X direction toward the + X direction ₁ Overlapping the swivel plate 751 of the flange 75. That is, the parking lever 73 has an overlapping portion 732v that overlaps the rotating plate 751 of the flange 75 when viewed in the axial direction of the manual shaft 76 ₁ 。

In this configuration, the parking lever 73 can be disposed by effectively utilizing a space overlapping with the rotating plate 751 of the flange 75 when viewed from the axial direction of the manual shaft 76. Therefore, the flange 75 and the parking lever 73 can be compactly arranged, and the parking lock device 7 as a whole can be downsized.

In particular, when the parking pawl 72 is rotated to both the first position (see fig. 9) and the second position (see fig. 5), the overlapping portion 732v is formed as viewed in the axial direction of the manual shaft 76 ₁ Overlapping the rotation plate 751. Thus, the parking gear 71 can be locked and unlocked by the rotation of the parking pawl 72 with a compact configuration of the parking lock device 7.

The parking lever 73 includes a first lever 732a through which the cam member 731 is inserted, a second lever 732c which is inserted into and supported by an opening 752a of the support plate 752, and a third lever 732c which couples the first lever 732a and the second lever 732b, and the third lever 732c includes an overlapping portion 732v ₁ . That is, in the parking lever 73, the third lever 732c that connects the first lever 732a and the second lever 732b has an overlapping portion 732v ₁ . Thus, even if the second lever 732b is supported by the support plate 752 and does not overlap the rotary plate 751 as viewed in the axial direction of the manual shaft 76, the third lever 732c can be overlapped with the rotary plate 751, and the parking lock device 7 can be downsized as a whole.

In addition, the overlapping portion 732v ₁ Having a bent portion 732va. The bent portion 732va is a portion bent from the + Z direction toward the + Y direction in the third rod 732c. In this structure, the parking lever 73 can be configured as follows: make the overlapping part 732v ₁ The first rod 732a coupled to the third rod 732c is positioned to overlap the rotating plate 752 when viewed in the axial direction of the manual shaft 76, and extends in a direction different from the direction of the center axis of the second rod 732b via the bent portion 732va. This can increase the degree of freedom in designing the parking lever 73.

The third rod 732c further includes a coupling portion 732v ₂ . At the slaveThe coupling portion 732v is viewed in the axial direction of the manual shaft 76 ₂ Overlaps with the support plate 752 of the flange 75, and overlaps with the overlapping portion 732v ₁ And (5) connecting. That is, the third lever 732c also has a portion overlapping the support plate 752 of the flange 75 when viewed in the axial direction of the manual shaft 76, and overlapping the overlapping portion 732v ₁ Coupled coupling portion 732v ₂ 。

The third lever 732c has an overlapping portion 732v ₁ And a coupling portion 732v ₂ In the configuration of (1), the third lever 732 overlaps both the support plate 752 and the rotary plate 751 of the flange 75 when viewed in the axial direction of the manual shaft 76. This makes it possible to further reduce the size of the parking lock device 7 as a whole by further reducing the size of the parking lever 73 relative to the flange 75.

In addition to the cam member 731, the coil spring 733 is inserted through the lever main body 732. One end 733a of the coil spring 733 is locked to the first lever 732a of the lever main body 732. The other end portion 733b of the coil spring 733 is locked to the cam member 731. Therefore, the cam member 731 is biased toward the one end portion 73A by the coil spring 733.

(7-5. Details of the sleeve member)

Fig. 15 is a perspective view of the sleeve member 74 as viewed from the-Y direction side. The sleeve member 74 has a cam receiving portion 74b. The cam receiving portion 74b receives the truncated cone cylindrical portion 731a and the cylindrical portion 731b of the cam member 731. In particular, the cam receiving portion 74b receives the cam member 731 from the side opposite to the side in contact with the cam sliding portion 72b. When the parking lever 73 moves in a direction crossing the through hole 74a, the cam receiving portion 74b slides on the truncated cone cylinder portion 731a and the cylinder portion 731b. That is, the sleeve member 74 has a cam receiving portion 74b that receives the cam member 731 while sliding with the cam member 731 when the parking lever 73 moves in a direction crossing the through hole 74a.

In this configuration, the one end portion 73A side of the parking lever 73 is supported by the cam receiving portion 74b of the sleeve member 74 via the cam member 731. The other end 73B side of the parking rod 73 is supported by the flange 75 as described above. Thus, the both end portions of the parking lever 73 are supported by the sleeve member 74 and the flange 75, respectively, whereby the parking lever 73 is stably supported as compared with a structure in which only one end portion of the parking lever 73 is supported. Further, the cam receiving portion 74b receives the cam member 731 while sliding with the cam member 731, and therefore can guide the movement of the cam member 731 and stabilize the movement of the parking lever 73.

The cam receiving portion 74b has a concave surface 74b ₁ . Concave surface 74b ₁ When the parking lever 73 is moved in a direction crossing the through hole 74a, it is engaged with the tapered surface 731a of the circular truncated cone cylinder portion 731a ₁ And an outer peripheral surface 731b of the cylindrical portion 731b ₁ A concave surface in abutment. That is, the cam receiving portion 74b has a tapered surface 731a that is in contact with the truncated cone cylinder portion 731a when the parking lever 73 moves in a direction crossing the through hole 74a ₁ And an outer peripheral surface 731b of the cylindrical portion 731b ₁ Abutting concave surface 74b ₁ 。

In this configuration, when the parking lever 73 is moved from the state shown in fig. 13 in a direction crossing the through hole 74a, for example, toward the + Y direction side by the rotation of the flange 75, as shown in fig. 14, the truncated cone cylinder portion 731a and the cylinder portion 731b of the cam member 731 and the concave surface 74b of the cam receiving portion 74b are in this order ₁ Abutting and sliding. The truncated cone cylinder portion 731a has the tapered surface 731a as described above ₁ . Therefore, when the parking lever 73 moves toward the + Y direction side, the lever main body 732 into which the cam member 731 is inserted is pushed up with respect to the cam receiving portion 74b. At the same time, the cam sliding portion 72b of the parking pawl 72 follows the tapered surface 731a ₁ Is pushed up. Thereby, parking pawl 72 can be rotated from the second position toward the first position about rotation axis J6.

Further, since the through hole 74a of the sleeve member 74 is a long hole as described above, the lever main body 73 can be displaced in the long hole, for example, in the X direction and in the Z direction. Therefore, even when the lever main body 732 is pushed up with respect to the cam receiving portion 74b, the displacement of the lever main body 732 is not hindered by the through hole 74a, even when the displacement is accompanied in both the X direction and the Z direction.

Conversely, when the parking lever 73 is moved from the state of fig. 14 toward the-Y direction side by the rotation of the flange 75, as shown in fig. 13, the lever main body 732 is displaced in a direction approaching the cam receiving portion 74b in accordance with the movement of the cam member 731 toward the-Y direction side. Further, the pawl urging member 101 causes an urging force to act on the parking pawl 72 in a direction rotating from the first position toward the second position. The parking pawl 72 rotates from the first position to the second position about the rotation axis J6 by the displacement of the lever main body 732 and the biasing force of the pawl biasing member 101.

As shown in fig. 15, the sleeve member 74 further includes a pin insertion portion 74c and a fixing through hole 74d. The pin insertion portion 74c is a recess into which a positioning pin 121 (see fig. 16) described later is inserted. The pin insertion portion 74c may be a through hole into which the positioning pin 121 is inserted. The fixing through-hole 74d is a hole into which a fixing member 122 (see fig. 16) described later is inserted.

Fig. 16 is a perspective view of the sleeve member 74 in a state where the positioning pin 121 and the fixing member 122 are attached. As shown in fig. 16, the parking lock device 7 includes a positioning pin 121 and a fixing member 122. The positioning pin 121 is a pin for positioning the sleeve member 74 with respect to the housing 6. The fixing member 122 is provided so as to penetrate the sleeve member 74, and fixes the sleeve member 74 to the casing 6. Such a fixing member 122 is constituted by, for example, a bolt.

Fig. 17 is an enlarged perspective view of the inside of the housing 6 to which the sleeve member 74 is fixed. Fig. 18 is a perspective view showing the inside of the casing 6 of fig. 17 with the sleeve member 74 removed. The gear housing portion 62 of the housing 6 that houses at least the sleeve member 74 is provided with a first mounting hole 62a and a second mounting hole 62b. One end of the positioning pin 121 is inserted into the pin insertion portion 74c of the sleeve member 74, and the other end is inserted into the first mounting hole 62a of the gear housing 62. The fixing member 122 is inserted into the second mounting hole 62b of the gear housing 62 and fixed in a state inserted into the fixing through hole 74d of the sleeve member 74.

As described above, the parking lock device 7 according to the present embodiment further includes the housing 6 that houses at least the sleeve member 74, the fixing member 122 that penetrates the sleeve member 74 and is fixed to the housing 6, and the positioning pin 121 that positions the sleeve member 74 with respect to the housing 6. For example, when the sleeve member 74 is fixed to the housing 6 only by the fixing member 122, the sleeve member 74 may rotate in the ZX plane about the fixing member 122 when the sleeve member 74 receives an impact via the parking pawl 72 and the parking lever 73 due to the collision of the protrusion 72a with the projection 71 a.

In the present embodiment, the sleeve member 74 is fixed to the housing 6 by the fixing member 122 and is also positioned by the positioning pins 121. That is, the sleeve member 74 is positioned and supported relative to the housing 6 at two points. This prevents the sleeve member 74 from rotating within the ZX plane about the fixing member 122 due to an impact applied via the parking lever 73.

(7-6. Details of Flange)

Fig. 19 is a perspective view of the flange 75 in a state of supporting the other end 73B of the parking rod 73. Fig. 20 is a front view of the support plate 752 of the flange 75 as viewed from the + X direction. As described above, the support plate 752 of the flange 75 has the opening portion 752a. The other end 73B of the lever main body 732 of the parking lever 73 is inserted into the opening 752a. At this time, the other end 73B is inserted into the opening 752a with a gap T in the radial direction. That is, the flange 75 has an opening 752a into which the other end 73B of the lever main body 732 is inserted with a gap T.

The other end 73B of the lever main body 732 has a stopper 73B ₁ And 73B ₂ . Drop-proof piece 73B ₁ And 73B ₂ Are arranged in an axial direction. In addition, the retaining member 73B ₁ And 73B ₂ Are located at two positions point-symmetrical in the circumferential direction of the other end portion 73B. On the other hand, the opening 752a of the support plate 752 has a notch 752a ₁ . Notch 752a ₁ Are located at two positions in point symmetry in the circumferential direction of the opening 752a. In YZ plane, the notch 752a ₁ The retaining member 73B of the rod main body 732 ₁ And 73B ₂ The shape of (2) is large.

At the other end 73B and the retaining piece 73B ₁ The insertion opening 752a and the notch 752a ₁ On the inner side of the support plate 752, the opening 752 is positioned on the stopper 73B ₁ And 73B ₂ In between, the lever main body 322 is rotated by a slight angle in the circumferential direction of the other end portion 73B. Thus, the retaining member 73B ₁ And 73B ₂ The other end 73B is hooked to the support plate 752 and does not fall out of the opening 752. Thus, the rod ownerThe other end 73B of the body 732 is supported by the support plate 752.

Fig. 21 and 22 are bottom views showing a state where the parking lever 73 is viewed from the-Z direction side. In particular, fig. 21 shows the state of the parking lever 73 when the parking pawl 72 is in the first position. Fig. 22 shows a state of the parking lever 73 when the parking pawl 72 is in the second position.

In the present embodiment, as described above, the other end 73B of the lever main body 732 is inserted into the opening 752a of the flange 75 with the gap T therebetween. Thereby, the flange 75 can support the parking lever 73 to be swingable. Therefore, when the parking lever 73 is moved by the rotational driving of the flange 75, the parking lever 73 can be moved with a degree of freedom.

For example, the parking lever 73 supported by the support plate 752 is located away from the axis of the manual shaft 76. Therefore, when the flange 75 is rotated about the manual shaft 76, the parking lever 73 moves in the-Y direction along with the displacement in the-Z direction. When the parking lever 73 is swingably supported by the flange 75, the parking lever 73 can be tilted with respect to the YZ plane while being displaced in both the Y direction and the Z direction.

Accordingly, the one end portion 73A can be moved in the direction along the through hole 74a of the sleeve member 74 in the ZX plane simultaneously with the above-described displacement of the parking lever 73 in both directions, and the cam member 731 and the parking pawl 72 can be slid (see fig. 4 and 8). That is, even when the through hole 74a of the sleeve member 74 is formed of the long hole to absorb the impact as described above and the parking lever 73 is displaced in both directions as described above when the flange 75 rotates, the cam member 731 and the parking pawl 72 can be maintained in a state of sliding by the movement of the parking lever 73.

(7-7. Motor unit)

As shown in fig. 2, the motor unit 1 described in the present embodiment includes the parking lock device 7, the motor 2, the reduction gear device 4 having the second gear 42 (intermediate gear) and to which the rotational driving force of the motor 2 is transmitted, and the differential device 5 that transmits the rotational driving force transmitted via the reduction gear device 4 to the axle 55 that drives the wheels of the vehicle. The parking gear 71 of the parking lock device 7 is provided coaxially with the intermediate gear.

As described above, when the parking gear 71 is locked by the parking pawl 72, the second gear 42 provided coaxially with the parking gear 71 is also locked. The reduction gear 4 having the second gear 42 transmits a rotational driving force to the axle 55 via the differential 5. Therefore, the axle 55 does not rotate when the second gear 42 is locked, so that the wheels do not rotate. On the other hand, when the locking of the parking gear 71 by the parking pawl 72 is released, the second gear 42 can rotate. Thereby, the rotational driving force of the motor 2 is transmitted to the axle 55 via the reduction gear 4 and the differential gear 5, and the wheels are rotated.

The motor unit 1 having the parking lock device 7 of the present embodiment can obtain an effect of reducing damage to the components due to an impact generated by the protrusion 72a of the parking pawl 72 colliding with the parking gear 71 in the motor unit 1 having the motor 2 as the power source.

(8. Other)

For example, as shown in fig. 3, a surface of the parking gear 71 that traverses the circumferential direction, out of the surfaces forming the recess 71b, is set as a side surface 71b ₁ . When the wheel is rotated on a slope in a state where the parking pawl 72 is rotated to the first position and a load is applied to the parking gear 71 in the rotational direction, the protrusion 72a of the parking pawl 72 and the side surface 71b of the recess 71b of the parking gear 71 may be in contact with each other ₁ And (4) surface contact. In this case, even if the parking pawl 72 is to be rotated from the first position to the second position, the friction at the contact surface is large. Therefore, the projection 72a does not fall out of the recess 71b, and the lock of the parking gear 71 may not be released.

Therefore, the protruding portion 72a of the parking pawl 72 is preferably formed to be in contact with the side surface 71b of the recess 71b of the parking gear 71 ₁ The shape of the line contact. For example, the protrusion 72a is formed on the side face 71b of the recess 71b ₁ In the structure in which the contact portion of (2) is flat, the side face 71b of the recess 71b ₁ Preferably convex. In this case, when parking pawl 72 is to be rotated from the first position to the second position, friction at the contact position of protrusion 72a and recess 71b is smaller than in the case of surface contact. This makes it easy for the projection 72a to fall off the recess 71b, and the parking gear 71 is easily unlocked.

(modification of claw urging member)

Fig. 23 is a perspective view showing a schematic configuration of a parking lock device 7 using a modified example of the pawl urging member. Fig. 24 (a) is an explanatory view showing a modification of the pawl biasing member attached to the housing, fig. 24 (b) is an explanatory view showing a case where the modification of the pawl biasing member is attached to the housing, and fig. 24 (c) is an explanatory view showing a case where the pawl biasing member shown in the present embodiment is attached to the housing.

The pawl biasing member 1010 is a coil spring that biases the parking pawl 72 in a direction of rotating from the first position to the second position in a plane perpendicular to the second rotation axis J6, that is, a ZX plane, similarly to the pawl biasing member 101 described above. That is, the parking pawl 72 rotates between a first position where the projection 72a engages with the parking gear 71 and a second position where the projection 72a is spaced apart from the parking gear 71 by the movement of the cam member 731 in accordance with the movement of the parking lever 73.

The housing 6 of the gear housing 62 includes a support portion 66 for rotatably supporting the pawl shaft 78 and a placement portion 67 for placing the other arm portion 1010B of the pawl biasing member 1010. Support portion 66 stands from placement portion 67 to form a standing surface 67A thereof.

The pawl shaft 78 is provided so as to penetrate the support portion 66 and the parking pawl 72 in the Y direction. The parking pawl 72 rotates about the rotation axis J6. That is, the rotation axis J6 coincides with the central axis of the pawl shaft 78.

The claw biasing member 1010 is inserted into the outer periphery of the claw shaft 78. Further, the parking pawl 72 has a hole 72c formed in a side surface thereof, and the hole 72c is inserted by one end 1010A of one arm 1010A of the pawl urging member 1010.

As shown in fig. 24 (a), the pawl biasing member 1010 includes a coil portion 1010C, and one arm portion 1010A and the other arm portion 1010B formed so that the start end and the end of the coil portion 1010C extend in the outer circumferential direction from the coil portion 1010C. The wire material of the coil portion 1010C is spirally wound, and the coil portion 1010C is wound around the outer peripheral surface of the pawl shaft 78. One end 1010A of the one arm 1010A is bent toward the parking pawl 72 along the rotation axis J6, and is inserted into and supported by a hole 72c (see fig. 23) formed in a side surface of the parking pawl 72.

The other arm portion 1010B is bent toward the parking pawl 72 along the rotation axis J6, and is placed on the placement portion 67 of the housing 62. The other end 1010B of the arm 1010B is bent toward the coil portion 1010C, and further bent toward the parking pawl 72 along the rotation axis J6. The other end 1010b is bent at substantially right angle to the rotation axis J6. That is, the tip 1010x of the other end portion 1010b is bent at a substantially right angle in a direction away from the coil portion 1010C. That is, as shown in the drawing, the tip of the end portion 1010b faces in a direction away from the coil portion 1010C.

Next, a case where the pawl biasing member 1010 is attached to the housing 62 will be described.

First, a description will be given of a case where the pawl biasing member 101 is attached to the housing 66 with reference to fig. 24 (c).

First, the claw biasing member 101 is slid in the-X direction with respect to the claw shaft 78, and the coil portion 101C of the claw biasing member 101 is inserted into the claw shaft 78. At the same time, one end portion 101A of one arm portion 101A is inserted into the hole 72c of the parking pawl 72. Therefore, the one arm portion 101A of the pawl urging member 101 is inserted in a state of being located at substantially the same position in the circumferential direction as the mounted state when viewed from the direction along the rotation axis J6. Therefore, the other end portion 101B of the other arm portion 101B of the claw biasing member 101 at the start of attachment is elastically deformed in the Y direction as compared with the position of the other arm portion 101B of the claw biasing member 101 in the attached state.

Specifically, the other arm portion 101B of the pawl urging member 101 slides the placement portion 67 of the housing 6 toward the pawl shaft 78. When the arm portion 101B contacts the rising surface 67, a force pressing the arm portion 101B to the opposite side (Y direction) to the coil portion 101C acts, and the arm portion 101B flexes. The reaction force acts on the flexed arm portion 101B, and a force pressing the rising surface 67 acts. At this time, the tip of the end portion 101b faces the coil portion side, that is, the case 6 side, and the edge rises on the end face thereof, so that the rising surface 67A of the case 6 may be damaged by sliding while being pressed by the elastic force of the arm portion. This may cause contamination.

In contrast, in the pawl biasing member 1010 of the modified example, as shown in fig. 24 (b), the tip 1010x of the other end portion 1010b is bent at a substantially right angle in a direction away from the coil portion 1010C. That is, the tip 1010x of the other end 1010b faces in a direction away from the rising surface 67A of the housing 6. Since the tip 1010x of the other end 1010b does not face the rising surface 67A in this way, the edge can be prevented from contacting the rising surface 67A of the housing 6 when the pawl biasing member 1010 is assembled. This enables assembly without the tip 1010c coming into contact with the rising surface 67A, and thus damage and contamination due to contact with the edge can be avoided. As shown in fig. 24 (b), the other end portion 1010b slides while contacting the rising surface 67A, and therefore can slide smoothly, and the assembling property can be improved.

The direction of the tip 1010x is not limited to the direction of bending substantially at right angles away from the coil portion 1010C as in the modified example, and the tip 1010x may be directed in a direction different from the direction of the attachment claw biasing member 1010 and in a direction not contacting the rising surface 67A or the mounting portion 67.

While the embodiments of the present invention have been described above, the scope of the present invention is not limited to these embodiments, and various modifications can be made without departing from the scope of the present invention. The above embodiments and modifications thereof can be combined as appropriate.

Industrial applicability

The parking lock device of the present invention can be applied to, for example, a motor unit that drives a vehicle using a motor as a power source.

Claims

1. A parking lock device has:

a parking gear that rotates about a first rotation axis;

a parking pawl that has a projection that engages with the parking gear and that rotates about a second rotation axis along the first rotation axis;

a parking lever having a cam member contacting the parking pawl and a lever main body through which the cam member is inserted;

a sleeve member having one end portion of the rod main body of the parking rod inserted into the through hole;

a flange that supports the other end portion of the rod main body of the parking rod;

a manual shaft that is a shaft that serves as a rotation axis of the flange, the manual shaft being coupled to the flange; and

an actuator that rotationally drives the flange by the manual shaft to move the parking rod,

the parking pawl is rotated between a first position where the protrusion engages with the parking gear and a second position where the protrusion is away from the parking gear by movement of the cam member in accordance with movement of the parking lever,

the parking lock device further includes:

a housing that houses the sleeve member; and

a fixing member that fixes the sleeve member to the housing,

the parking pawl and the sleeve member are fixed in the housing,

the parking pawl, the sleeve member, and the flange are located radially outward of the parking gear,

the flange is located between the fixing member of the sleeve member and the projection on which the parking pawl engages with the parking gear in a direction perpendicular to the first rotation axis.

2. The parking lock device according to claim 1,

the sleeve member has a through hole that penetrates in a direction along the second rotation axis, and the through hole is an elongated hole when viewed in the direction along the second rotation axis.

3. The parking lock device according to claim 2,

the parking pawl further includes a cam sliding portion that slides with the cam member when the parking lever moves in the through hole,

the through hole of the sleeve member is an elongated hole extending in the following direction: the cam member is configured to slide along the cam sliding portion in accordance with the movement of the parking lever, and the cam member presses the cam sliding portion in a plane perpendicular to the second rotation axis.

4. The parking lock device according to claim 2,

the sleeve member has a cam receiving portion that receives the cam member while sliding with the cam member when the parking lever moves in the through hole.

5. The parking lock device according to claim 4,

the cam member has:

a circular truncated cone cylinder portion having a tapered surface whose outer diameter increases from the one end portion side toward the other end portion side of the rod main body; and

a cylindrical portion that is coupled to the truncated cone cylindrical portion on the other end portion side of the rod main body and has an outer peripheral surface having an outer diameter equal to a maximum outer diameter of the truncated cone cylindrical portion,

the cam receiving portion has a concave surface that abuts against the tapered surface of the truncated cone cylinder portion and the outer peripheral surface of the cylinder portion when the parking rod moves in a direction crossing the through hole.

6. The parking lock device according to claim 2,

the parking lock device also has a positioning pin for positioning the sleeve member relative to the housing.

7. The parking lock device according to claim 2,

the flange has an opening into which the other end of the rod main body is inserted with a gap therebetween.

8. The parking lock device according to any one of claims 1 to 7,

the parking lock device further includes:

a pawl biasing member that biases the parking pawl in a direction of rotation from the first position to the second position within a plane perpendicular to the second rotation axis; and

and a rotation preventing portion that abuts against the parking pawl when the parking pawl is rotated to the second position, and prevents the parking pawl from being rotated by the biasing force of the pawl biasing member.

9. The parking lock device according to claim 8,

the pawl biasing member includes a coil portion, and one arm portion and the other arm portion each formed by extending a start end and a finish end of the coil portion in an outer circumferential direction from the coil portion,

the claw urging member is attached to an outer peripheral surface of a claw shaft provided on the second rotation axis,

one end portion of the one arm portion is attached to the parking pawl,

the other end portion of the other arm portion is attached to the mounting portion of the housing,

the tip of the other end portion faces a direction different from a direction in which the claw biasing member is attached and faces a direction not facing the mounting portion.

10. The parking lock device according to any one of claims 1 to 7,

the housing has:

a motor chamber for accommodating a motor;

a gear chamber that houses a differential device and a reduction gear that transmits a rotational driving force of the motor; and

a partition wall that partitions the motor chamber and the gear chamber,

the parking lock device is located in the gear chamber.

11. The parking lock device according to claim 10,

the actuator is fixed to an outer peripheral surface of the gear chamber of the housing.

12. The parking lock device according to claim 11,

the reduction gear has a motor gear, an intermediate gear, and a final drive gear,

the differential has a ring gear meshed with the final drive gear,

a direction perpendicular to the first rotation axis is a front-rear direction of the vehicle in which the parking lock device is located on a front side of the gear chamber.

13. The parking lock device according to claim 12,

the oil passage is located inside the housing,

an oil reservoir that stores oil supplied to the oil passage is located in the gear chamber.

14. The parking lock device according to claim 13,

a cooler that cools the oil and a pump that sucks up the oil from the oil reservoir and supplies the oil to the motor are provided in a path of the oil passage.

15. The parking lock device according to claim 14,

the pump is an electric pump, and the pump is attached to an outer peripheral surface of the housing.

16. The parking lock device according to any one of claims 10 to 15,

an inverter unit is fixed to the housing, and is electrically connected to the motor to supply current to the motor.

17. A motor unit having:

the parking lock device according to claim 12 or 15;

a motor;

a reduction gear having an intermediate gear and to which a rotational driving force of the motor is transmitted; and

a differential device that transmits the rotational driving force transmitted via the reduction gear device to an axle that drives wheels of a vehicle,

the parking gear of the parking lock device is disposed coaxially with the intermediate gear.