CN111623116B

CN111623116B - Drive device

Info

Publication number: CN111623116B
Application number: CN202010088043.5A
Authority: CN
Inventors: 福永庆介
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2019-02-28
Filing date: 2020-02-12
Publication date: 2022-01-18
Anticipated expiration: 2040-02-12
Also published as: JP2020139579A; CN111623116A; JP7338168B2

Abstract

In one embodiment of the drive device of the present invention, a movable member includes a support portion that supports a parking lock arm. The support part has: part 1; and a 2 nd portion whose outer diameter becomes smaller toward the 1 st direction side. The parking lock arm is engaged with the parking lock gear at a position where an end portion of the movable member on one side in the 1 st direction is in contact with an inner wall surface of the housing. The control unit detects a 1 st rotation angle of the shift motor when the shift motor is moved from an out-of-parking position where the parking lock arm and the parking lock gear are disengaged to a position where an end portion of the movable member on the 1 st direction side abuts against an inner wall surface of the housing by the encoder, calculates a 2 nd rotation angle smaller than the 1 st rotation angle from the 1 st rotation angle, and moves the movable member from the out-of-parking position to a parking position where the parking lock arm and the parking lock gear are engaged by rotating the shift motor with the 2 nd rotation angle as a target value.

Description

Drive device

Technical Field

The present invention relates to a drive device.

Background

A drive device mounted on a vehicle and having a parking lock device is known. For example, patent document 1 describes a parking lock device including: a parking rod; the cam is externally installed on the parking rod; and a parking lock ball engageable with the parking gear. The parking lock ball is moved by a cam moving together with the parking lever so as to be engaged with the parking gear.

Patent document 1: japanese patent laid-open publication No. 2017-52321

In the parking lock device as described above, due to assembly tolerances, dimensional tolerances of the respective parts, and the like, there may be a deviation in the relative positions of the parking lock ball and the cam. In this case, the parking lock ball cannot be moved sufficiently, and the parking lock ball and the parking gear may not be engaged with each other. Therefore, the rotation of the axle may not be locked.

In contrast, in consideration of a deviation such as a tolerance, it is also possible to consider that the amount of movement of the parking lever and the cam is sufficiently large. However, in this case, the parking lever moves excessively, and the parking lever may collide with an inner wall surface of a housing of the drive device. Therefore, the parking lock device may be damaged.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a drive device having a structure capable of suppressing damage to a parking switch mechanism and suppressing the inability to lock the rotation of an axle.

One aspect of the present invention is a drive device mounted on a vehicle, including: a motor; a transmission mechanism having a gear, the transmission mechanism transmitting torque output from the motor to an axle of the vehicle; a parking lock gear fixed to the gear and coupled to the axle; a parking switching mechanism having a movable member that moves in a 1 st direction and a parking lock arm that moves in a 2 nd direction perpendicular to the 1 st direction in accordance with the movement of the movable member in the 1 st direction, the parking switching mechanism being capable of locking rotation of the axle by engaging with the parking lock gear; a housing that houses the motor, the transmission mechanism, the parking lock gear, and the parking switching mechanism; an electric actuator having a shift motor that moves the movable member in the 1 st direction in accordance with a shift operation of the vehicle, and an encoder that detects a rotation angle of the shift motor; and a control unit that controls the electric actuator. The movable member has a support portion that supports the parking lock arm from one side in the 2 nd direction. The support portion has: part 1; and a 2 nd portion connected to one side of the 1 st portion in the 1 st direction, an outer diameter of which becomes smaller toward the one side in the 1 st direction. The parking lock arm is supported by the 1 st portion from the 2 nd direction side and engages with the parking lock gear at a position where an end portion of the movable member on the 1 st direction side contacts with an inner wall surface of the housing. The control unit detects a 1 st rotation angle by the encoder, the 1 st rotation angle being a rotation angle of the shift motor when the shift motor is moved from an out-of-parking position where the parking lock arm is disengaged from the parking lock gear to a state where an end portion of the movable member on the 1 st direction side is in contact with an inner wall surface of the housing, calculates a 2 nd rotation angle smaller than the 1 st rotation angle from the 1 st rotation angle, and rotates the shift motor with the 2 nd rotation angle as a target value to move the movable member from the out-of-parking position to a parking position where the parking lock arm is engaged with the parking lock gear.

According to one aspect of the present invention, in the drive device, it is possible to suppress damage to the parking switch mechanism and to suppress the inability to lock the rotation of the axle.

Drawings

Fig. 1 is a perspective view showing a driving device of the present embodiment.

Fig. 2 is a view of a part of the driving device of the present embodiment as viewed from above.

Fig. 3 is a view showing a part of the driving device of the present embodiment, and is a sectional view taken along line III-III in fig. 2.

Fig. 4 is a left side view of a part of the driving device of the present embodiment.

Fig. 5 is a perspective view showing a part of the gear housing of the present embodiment.

Fig. 6 is a perspective view showing the parking switching mechanism of the present embodiment.

Fig. 7 is a diagram showing one state of the movable member in the unlocked state of the parking lock gear of the present embodiment.

Fig. 8 is a diagram showing another state of the movable member in the unlocked state of the parking lock gear of the present embodiment.

Fig. 9 is a perspective view showing one state of the movable member in the locked state of the parking lock gear of the present embodiment.

Fig. 10 is a diagram showing a state in which the movable member of the present embodiment is brought into contact with the inner wall surface of the housing.

Fig. 11 is a perspective view showing a part of the parking switching mechanism of the present embodiment.

Fig. 12 is a graph showing an example of a temporal change in the rotation angle of the shift motor according to the present embodiment.

Fig. 13 is a graph showing another example of the temporal change in the rotation angle of the shift motor in the present embodiment.

Description of the reference symbols

1: a drive device; 10: a housing; 10 a: an inner wall surface; 20: a motor; 52: 2 nd gear (gear); 53: a parking lock gear; 70: a parking switching mechanism; 70 a: a movable member; 73: a support portion; 73 a: part 1; 73 b: part 2; 77: a parking lock arm; 77 c: an end portion; 80: an electric actuator; 82: a shift motor; 83: an encoder; 84: a control unit; 100: a transfer mechanism; p1: a parking position; p2: a non-park position; phi: rotating the angle; phi 1: rotation angle 1; phi 2: rotation angle 2; phi 3: and (3) rotating angle.

Detailed Description

In the following description, the vertical direction is defined based on the positional relationship in the case where the drive device 1 of the present embodiment shown in fig. 1 is mounted on a vehicle on a horizontal road surface, and the description is 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 is a vertical direction with the + Z side as the upper side and the-Z side as the lower side. The X-axis direction is a direction perpendicular to the Z-axis direction, and is a front-rear direction of the vehicle on which the drive device 1 is mounted. In the present embodiment, the + X side is the front side of the vehicle and the-X side is the rear side of the vehicle. The Y-axis direction is a direction perpendicular to both the X-axis direction and the Z-axis direction, and is the left-right direction of the vehicle. In the present embodiment, the + Y side is the left side of the vehicle and the-Y side is the right side of the vehicle.

The positional relationship in the front-rear direction is not limited to that of the present embodiment, and the + X side may be the rear side of the vehicle and the-X side may be the front side of the vehicle. In this case, the + Y side is the right side of the vehicle and the-Y side is the left side of the vehicle.

In the present embodiment, a direction parallel to the Z-axis direction is referred to as a "vertical direction Z", a direction parallel to the X-axis direction is referred to as a "front-rear direction X", and a direction parallel to the Y-axis direction is referred to as a "left-right direction Y". The positive side (+ Z side) in the Z-axis direction is referred to as "upper side", and the negative side (-Z side) in the Z-axis direction is referred to as "lower side". The positive side (+ X side) in the X axis direction is referred to as "front side", and the negative side (-X side) in the X axis direction is referred to as "rear side". The positive side (+ Y side) in the Y axis direction is referred to as "left side", and the negative side (-Y side) in the Y axis direction is referred to as "right side". In the present embodiment, the left-right direction Y corresponds to the 1 st direction. The vertical direction Z corresponds to the 2 nd direction. The left side corresponds to the 1 st direction side. The lower side corresponds to one side in the 2 nd direction.

The motor axis J1 shown in the drawings as appropriate extends in the Y-axis direction, i.e., the left-right direction of the vehicle. In the following description, unless otherwise specified, the radial direction about the motor axis J1 is simply referred to as the "radial direction", and the circumferential direction about the motor axis J1 (i.e., the direction around the motor axis J1) is simply referred to as the "circumferential direction". In the present specification, the "parallel direction" also includes a substantially parallel direction, and the "perpendicular direction" also includes a substantially perpendicular direction.

The drive device 1 is mounted on a vehicle having 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. As shown in fig. 1 to 4, the drive device 1 includes a housing 10, a motor 20, a transmission mechanism 100, a parking lock gear 53, a rotation detection device 30, an inverter unit 40, an electric actuator 80, and a parking switching mechanism 70, wherein the transmission mechanism 100 includes a reduction gear device 50 and a differential device 60.

The housing 10 houses the motor 20, the transmission mechanism 100, the parking lock gear 53, the rotation detection device 30, and the parking switching mechanism 70. Although not shown, oil is contained in the casing 10. As shown in fig. 1 and 2, the housing 10 includes a motor housing 11, a gear housing 12, a motor cover 13, and a lid 14.

The motor housing 11 includes a motor housing body 11a and a coupling portion 11 b. As shown in fig. 3, the motor housing main body portion 11a is tubular and extends in the left-right direction Y so as to surround the motor axis J1. The motor housing main body portion 11a is open to the right side. The motor case body 11a houses the motor 20. As shown in fig. 2, the coupling portion 11b is provided at the left end of the motor housing body portion 11 a. The coupling portion 11b protrudes rearward from the motor housing body 11 a.

The gear housing 12 is fixed to the left side of the motor housing 11. More specifically, the right end of the gear housing 12 is fixed to the coupling portion 11b by a screw. Although not shown, the gear housing 12 is open to the right side. The gear housing 12 has a 1 st housing portion 12a and a 2 nd housing portion 12 b. The 1 st accommodation portion 12a is located on the left side of the motor case body portion 11 a. The 1 st housing portion 12a houses the reduction gear 50 and the parking lock gear 53. The 2 nd receiving portion 12b is connected to the rear side of the 1 st receiving portion 12 a. The 2 nd accommodating portion 12b is located on the left side of the portion of the connecting portion 11b that protrudes rearward from the motor case body 11 a. The 2 nd accommodating portion 12b accommodates the differential device 60. The 1 st housing part 12a protrudes leftward from the 2 nd housing part 12 b.

As shown in fig. 5, the gear housing 12 has a side wall portion 12d, a peripheral wall portion 12c, and a fixing portion 12 e. The side wall portion 12d is a wall portion on the left side of the gear housing 12. The peripheral wall portion 12c is a cylindrical wall portion extending rightward from the outer peripheral edge of the side wall portion 12 d. The fixing portion 12e protrudes rightward from the side wall portion 12 d. More specifically, the fixing portion 12e protrudes rightward from a front end portion of the side wall portion 12d at the lower end portion. In the present embodiment, the fixed portion 12e has a columnar shape centered on a central axis J6 parallel to the motor axis J1.

The fixing portion 12e has a fitting recess 12f and a female screw hole 12 g. That is, the housing 10 has a fitting recess 12f and a female screw hole 12 g. The central axis J6 is a central axis of a through hole 75h described later. In the following description, the circumferential direction around the central axis J6 is referred to as "circumferential direction θ" and is appropriately indicated by an arrow in the drawings.

The fitting recess 12f is recessed leftward from the right end of the fixing portion 12 e. The outer shape of the fitting recess 12f is a circular shape centered on the central axis J6 when viewed in the left-right direction Y. The female screw hole 12g is provided in the bottom of the fitting recess 12 f. The female screw hole 12g is recessed leftward from the bottom surface of the fitting recess 12 f. The inner edge of the female screw hole 12g has a circular shape centered on the central axis J6 when viewed in the left-right direction Y.

As shown in fig. 3, the motor cover 13 is fixed to the right side of the motor housing 11. More specifically, the motor cover 13 is fixed to the right end of the motor housing body 11a by screws. The motor cover 13 closes the opening on the right side of the motor housing main body portion 11 a. The motor cover 13 has a housing recess 16 recessed to the left side in the center portion.

The motor cover 13 has a plurality of mounting portions 15. The plurality of mounting portions 15 are cylindrical projecting rightward. The plurality of mounting portions 15 are located radially outward of the housing recess 16. The mounting portion 15 has a female screw hole 15a into which a screw for fixing the housing 10 to the vehicle body is screwed. The housing 10 is fixed to a vehicle body as an attached body via an attaching portion 15.

As shown in fig. 1, the plurality of mounting portions 15 are arranged in the circumferential direction. As shown in fig. 2, the end surface on the right side of the mounting portion 15 is the portion located on the rightmost side in the drive device 1. That is, the housing 10 has a mounting portion 15 at the right end. As shown in fig. 3, the lid 14 is fixed to the right surface of the motor cover 13 by screws. The lid 14 is plate-shaped with its plate surface facing in the left-right direction Y. The lid 14 closes the opening on the right side of the housing recess 16.

The motor 20 has a rotor 21 and a stator 22. The rotor 21 rotates about a motor axis J1. The rotor 21 has a shaft 21a and a rotor body 21 b. The shaft 21a extends in the left-right direction Y along the motor axis J1. Although not shown, the outer shape of the shaft 21a as viewed in the left-right direction Y is a circular shape centered on the motor axis J1. The shaft 21a is rotatably supported by a bearing 25. The bearing 25 is held by the motor cover 13. The right end of the shaft 21a is inserted into the inside of the accommodation recess 16. Although not shown, a reduction gear 50 is coupled to the left end of the shaft 21 a. Thereby, the reduction gear 50 is connected to the motor 20.

In the present embodiment, the shaft 21a is a hollow shaft having an oil passage 21c provided therein. The oil contained in the casing 10 is supplied to the oil passage 21 c. The oil passage 21c passes through the shaft 21a in the left-right direction Y. The rotor body 21b is fixed to the outer peripheral surface of the shaft 21 a. Although not shown, the rotor body 21b includes a rotor core and a rotor magnet.

The stator 22 is located outside the rotor 21 in the radial direction of the motor axis J1. The stator 22 includes a stator core 23, an insulator not shown, and a plurality of coils 24. The stator core 23 is fixed inside the motor case body portion 11 a. The plurality of coils 24 are attached to the stator core 23 via an insulator not shown.

The transmission mechanism 100 transmits the torque output from the motor 20 to an axle of the vehicle. In the present embodiment, the rotation of the motor 20 is decelerated by the deceleration device 50 of the transmission mechanism 100, and transmitted to the differential device 60 of the transmission mechanism 100. As shown in fig. 4, the reduction gear 50 includes a 1 st gear 51, a 2 nd gear 52, and a 3 rd gear not shown. That is, the transmission mechanism 100 includes the 1 st gear 51, the 2 nd gear 52, and the 3 rd gear not shown. The 1 st gear 51 is fixed to the left end of the shaft 21 a. The 2 nd gear 52 rotates about a rotation axis J3 parallel to the motor axis J1. The differential device 60 has a ring gear 61. The torque output from the shaft 21a of the motor 20 is sequentially transmitted to the ring gear 61 of the differential device 60 via the 1 st gear 51, the 2 nd gear 52, and the 3 rd gear.

Differential device 60 is connected to reduction gear unit 50, and transmits the torque output from motor 20 to the axle of the vehicle. The differential device 60 has the following functions: when the vehicle turns, the speed difference between the left and right wheels is absorbed, and the same torque is transmitted to the axles of the left and right wheels. The ring gear 61 rotates about a differential axis J2 parallel to the motor axis J1. The torque output from the motor 20 is transmitted to the ring gear 61 via the reduction gear 50.

The parking lock gear 53 is fixed to the 2 nd gear 52. That is, in the present embodiment, the 2 nd gear 52 corresponds to a gear to which the parking lock gear 53 is fixed. In the present embodiment, the parking lock gear 53 is located on the left side (+ Y side) of the 2 nd gear 52. The parking lock gear 53 is disposed coaxially with the 2 nd gear 52. The parking lock gear 53 rotates about the rotation axis J3. The parking lock gear 53 is coupled to an axle of the vehicle via a 3 rd gear not shown and a differential device 60. The parking lock gear 53 has a plurality of teeth portions 53 a.

The rotation detecting device 30 can detect the rotation of the rotor 21. As shown in fig. 3, the rotation detection device 30 is housed in the housing recess 16. In the present embodiment, the rotation detecting device 30 is, for example, a resolver. The rotation detecting device 30 has a resolver rotor 31 and a resolver stator 32. The resolver rotor 31 is fixed to the outer peripheral surface of the right end of the shaft 21 a. Thereby, the rotation detecting device 30 can detect the rotation of the rotor 21 at the right end of the rotor 21. The resolver stator 32 is located radially outside the resolver rotor 31. The resolver stator 32 is fixed to an inner surface of the housing recess 16.

As shown in fig. 1 and 2, the inverter unit 40 is located at the rear side of the case 10. The inverter unit 40 includes an inverter housing 41 and an inverter not shown. Although not shown, the inverter is electrically connected to the stator 22.

The inverter case 41 houses an inverter. The inverter case 41 is fixed to the case 10. In the present embodiment, the inverter case 41 is fixed to the radially outer surface of the case 10. More specifically, the inverter case 41 is fixed to a rear portion of the radially outer surface of the motor case body 11 a. That is, the inverter case 41 is fixed to the rear side of the case 10 in the front-rear direction X perpendicular to the left-right direction Y.

As shown in fig. 1, the inverter case 41 has a substantially rectangular box shape extending in the left-right direction Y. The inverter case 41 has an inverter case main body portion 42 and an inverter cover 43. The inverter housing main body portion 42 has a substantially rectangular box shape that is open upward and is long in the left-right direction Y. The inverter cover 43 closes an upper opening of the inverter housing main body portion 42. The inverter cover 43 has a 1 st cover 43a and a 2 nd cover 43 b. The 1 st cover 43a and the 2 nd cover 43b are different members from each other. The 1 st cover 43a covers the upper side of the inverter, not shown. The 2 nd cover 43b is positioned on the left side of the 1 st cover 43 a. The 2 nd cover 43b covers an upper side of the bus bar, not shown, connected to the inverter.

As shown in fig. 2 and 4, the electric actuator 80 is fixed to the outer side surface of the housing 10. More specifically, the electric actuator 80 is fixed to a front portion of the radially outer surface of the 1 st housing portion 12a of the gear housing 12. As shown in fig. 4, the electric actuator 80 includes a manual shaft 81, a shift motor 82, an encoder 83, and a control unit 84. That is, the drive device 1 includes a manual shaft 81, a shift motor 82, an encoder 83, and a control unit 84.

The manual shaft 81 extends in the front-rear direction X perpendicular to the left-right direction Y. As shown in fig. 6, in the present embodiment, the manual shaft 81 has a cylindrical shape centered on a rotation axis J4 extending in the front-rear direction X. As shown in fig. 4, the manual shaft 81 penetrates the peripheral wall portion 12c of the gear housing 12 and protrudes into the gear housing 12.

The shift motor 82 rotates the manual shaft 81 about the rotation axis J4 in accordance with a shift operation of the vehicle. The shift motor 82 moves a movable member 70a, which will be described later, of the parking switching mechanism 70 in the left-right direction Y by rotating the manual shaft 81. In the present embodiment, the shift motor 82 rotates the manual shaft 81 through a speed reducer, not shown. Further, the shift motor 82 may rotate the manual shaft 81 without a reduction gear.

The encoder 83 detects the rotation angle Φ of the shift motor 82. The encoder 83 is not particularly limited as long as it can detect the rotation angle Φ of the shift motor 82. The encoder 83 is, for example, a magnetic encoder. The encoder 83 may directly measure the rotation angle Φ of the shift motor 82 and detect the rotation angle Φ of the shift motor 82, or may indirectly measure the rotation angle Φ of the shift motor 82 by measuring the rotation angle Φ of the manual shaft 81 and detecting the rotation angle Φ thereof based on the reduction ratio of a reduction gear, not shown.

The control unit 84 controls the electric actuator 80. Information of the shift operation is input from the control device of the vehicle to the control portion 84. The control unit 84 rotates the shift motor 82 by a predetermined rotation angle Φ in accordance with the information of the shift operation, and moves a movable member 70a, which will be described later, of the parking switching mechanism 70 in the left-right direction Y.

The parking switching mechanism 70 is driven by an electric actuator 80 according to a shift operation of the vehicle. The parking switching mechanism 70 switches the parking lock gear 53 between a locked state and an unlocked state. The parking switching mechanism 70 sets the parking lock gear 53 in the locked state when the gear of the vehicle is in the parking state, and sets the parking lock gear 53 in the unlocked state when the gear of the vehicle is not in the parking state. The case where the gear of the vehicle is not in the parking state includes, for example, the case where the gear of the vehicle is in the drive, neutral, or reverse. As shown in fig. 6, the parking switch mechanism 70 includes a movable member 70a, a parking lock arm 77, a guide member 75, and a plate spring member 76.

The movable member 70a moves in the left-right direction Y in accordance with a shift operation of the vehicle. In the present embodiment, the movable member 70a is moved by the electric actuator 80. The position of the movable member 70a in the left-right direction Y is switched at least between the parking position P1 and the non-parking position P2. The parking position P1 is a position of the movable member 70a in the left-right direction Y when the gear of the vehicle is in a parking state. The non-parking position P2 is a position of the movable member 70a in the left-right direction Y when the gear of the vehicle is not in a parking state. The parking position P1 is a position on the left side (+ Y side) of the non-parking position P2. In fig. 6, the movable member 70a located at the parking position P1 is indicated by a solid line, and the movable member 70a located at the non-parking position P2 is indicated by a two-dot chain line.

The movable member 70a includes a rod coupling portion 71, a rod 72, a support portion 73, and a coil spring 74. The rod coupling portion 71 is fixed to the manual shaft 81. The rod coupling portion 71 extends in the radial direction of the manual shaft 81. In the present embodiment, the lever coupling portion 71 extends downward from the manual shaft 81. In the present embodiment, the rod coupling portion 71 has a plate shape with a plate surface facing in the front-rear direction X. The width of the rod coupling portion 71 increases as it goes away from the manual shaft 81 in the radial direction of the manual shaft 81. The rod coupling portion 71 has

recesses

71a, 71 b. That is, the movable member 70a has

recesses

71a and 71 b.

The

recesses

71a and 71b are provided at the distal end of the rod coupling portion 71. The

recesses

71a, 71b are recessed upward. More specifically, in the present embodiment, the

recesses

71a and 71b are recessed upward from the lower end of the rod coupling portion 71. The

recesses

71a and 71b penetrate the rod coupling portion 71 in the front-rear direction X. The

recesses

71a and 71b are arranged in parallel in the circumferential direction of the manual shaft 81. In the present embodiment, the

recesses

71a and 71b are arranged along the left-right direction Y.

The rod 72 is arranged to be movable in the left-right direction Y. The lever 72 has a connecting portion 72a and a lever main body 72 b. The connecting portion 72a has a rod shape extending in the front-rear direction X. The front end (+ X side) of the connecting portion 72a penetrates the rod coupling portion 71 in the front-rear direction X and is fixed to the rod coupling portion 71. Thus, the rod 72 is coupled to the manual shaft 81 via the rod coupling portion 71. The lever main body 72b has a rod shape extending in the left-right direction Y. In the present embodiment, the lever main body 72b extends to the left side (+ Y side) from the end portion on the rear side (-X side) of the connecting portion 72 a. The lever main body 72b has a protrusion 72c at a portion near the connecting portion 72 a. A cylindrical member 72d extending in the left-right direction Y is fitted and fixed to the left end of the lever main body 72 b.

The support portion 73 supports the parking lock arm 77 from below. In the present embodiment, the support portion 73 has a ring shape through which the rod main body 72b passes. The support portion 73 is movable in the left-right direction Y with respect to the lever main body 72 b. The support portion 73 extends in the left-right direction Y. As shown in fig. 7 to 10, the support portion 73 has a 1 st portion 73a and a 2 nd portion 73 b. The 1 st portion 73a is a portion on the right side in the support portion 73. The outer diameter of the 1 st portion 73a is the same throughout the left-right direction Y. The outer diameter of the 1 st portion 73a is largest among the outer diameters of the support portions 73.

The 2 nd portion 73b is a portion on the left side in the support portion 73. The 2 nd portion 73b is connected to the left side of the 1 st portion 73 a. The left end of the 2 nd section 73b is pressed by the coil spring 74 to contact the right end of the cylindrical member 72 d. The outer diameter of the 2 nd portion 73b becomes smaller toward the left side. The outer diameter of the right end of the 2 nd portion 73b is the same as the outer diameter of the left end of the 1 st portion 73 a. The outer diameter of the left end of the 2 nd portion 73b is larger than the outer diameter of the cylindrical member 72 d. In the present embodiment, the outer peripheral surface of the 2 nd portion 73b is a tapered surface 73c whose outer diameter becomes smaller toward the left side.

In fig. 7 and 9, the position in the left-right direction Y of the left end portion of the movable member 70a in the parking position P1 is indicated by a one-dot chain line and a symbol "P1". In fig. 7, the position in the left-right direction Y of the left end portion of the movable member 70a located at the non-parking position P2 is indicated by a one-dot chain line and a symbol "P2".

The coil spring 74 extends in the left-right direction Y. As shown in fig. 6, the coil spring 74 is disposed between the support portion 73 and the projection portion 72c in the left-right direction Y. The lever main body 72b passes through the coil spring 74. The right side (-Y side) end of the coil spring 74 contacts the projection 72 c. The left end (+ Y side) of the coil spring 74 is in contact with the right surface of the support portion 73. The coil spring 74 expands and contracts as the support portion 73 moves relative to the lever main body 72b in the lateral direction Y, and applies an elastic force in the lateral direction Y to the support portion 73.

The parking lock arm 77 is located on the rear side (-X side) of the movable member 70 a. The parking lock arm 77 is rotatably supported by a support shaft 78 centered on a rotation axis J5 parallel to the motor axis J1. The parking lock arm 77 has a parking lock arm main body 77a and an engaging portion 77 b.

The parking lock arm main body 77a extends from the support shaft 78 to the front side (+ X side). The front end 77c of the parking lock arm main body 77a contacts the movable member 70a from above. More specifically, end 77c contacts support portion 73 or cylindrical member 72d from above. A right side (-Y side) portion of the lower surface of the end portion 77c is an inclined portion 77d located on the upper side as going to the right side. The engaging portion 77b protrudes upward from the parking lock arm main body 77 a. A coil spring 79 is attached to the support shaft 78. The coil spring 79 applies an elastic force in the counterclockwise direction when viewed from the left side (+ Y side) about the rotation axis J5 to the parking lock arm 77.

The parking lock arm 77 moves in the vertical direction Z perpendicular to the left-right direction Y in accordance with the movement of the movable member 70a in the left-right direction Y. More specifically, as the lever 72 and the support portion 73 move in the left-right direction Y, the parking lock arm 77 moves in the vertical direction Z by rotating about the rotation axis J5. In the present specification, the phrase "the parking lock arm 77 moves in the vertical direction Z" means that at least a part of the parking lock arm 77 may move in the vertical direction Z.

When the lever coupling portion 71 rotates counterclockwise as viewed from the front side (+ X side) in accordance with the rotation of the manual shaft 81, the lever 72 and the support portion 73 move to the left side (+ Y side). The outer diameter of the tapered surface 73c of the support portion 73 increases from the left side to the right side (-Y side). Therefore, when the support portion 73 moves to the left side, the end portion 77c is lifted up by the tapered surface 73c, and the parking lock arm 77 rotates clockwise when viewed from the left side (+ Y side) about the rotation axis J5. Thus, although not shown, the meshing portion 77b moves upward to approach the parking lock gear 53 and meshes with the tooth portions 53a of the parking lock gear 53. In fig. 6, the parking lock arm 77 located at the position of meshing with the parking lock gear 53 is indicated by a solid line.

When the parking lock gear 53 is engaged with the parking lock arm 77, the support portion 73 is also positioned at the parking position P1, and the entire movable member 70a is positioned at the parking position P1. That is, when the movable member 70a is located at the parking position P1, the parking lock arm 77 is engaged with the parking lock gear 53 coupled to the axle. The support portion 73 is clamped at the parking position P1 in a state of being in contact with a contact portion 75b of the guide member 75 and a parking lock arm 77, which will be described later. By engaging the parking lock arm 77 with the parking lock gear 53, the parking lock gear 53 is in a locked state. Thus, the parking lock arm 77 can lock the rotation of the axle by engaging with the parking lock gear 53.

When the parking lock arm 77 approaches the parking lock gear 53, the meshing portion 77b may contact the tooth portion 53a depending on the position of the tooth portion 53a of the parking lock gear 53. In this case, the parking lock arm 77 may not be moved to a position where the engaging portion 77b is engaged between the tooth portions 53 a. Even in such a case, in the present embodiment, since the support portion 73 is movable in the left-right direction Y with respect to the rod 72, the rod 72 can be allowed to move in the parking position P1 and the support portion 73 is positioned on the right side (-Y side) of the parking position P1. This can prevent the manual shaft 81 from being hindered from rotating, and can prevent a load from being applied to the electric actuator 80 that rotates the manual shaft 81.

Further, in a state where the lever 72 is positioned at the parking position P1 and the support portion 73 is positioned on the right side (-Y side) of the parking position P1, the coil spring 74 is in a compression-deformed state. Therefore, the support portion 73 is applied with an elastic force leftward (+ Y direction) by the coil spring 74. Thereby, a rotational moment in a clockwise direction when viewed from the left side (+ Y side) about the rotation axis J5 is applied to the parking lock arm 77 from the coil spring 74 via the support portion 73. Therefore, when the parking lock gear 53 rotates to shift the position of the tooth portion 53a, the parking lock arm 77 rotates to engage the engaging portion 77b between the tooth portions 53 a.

When the lever coupling portion 71 is rotated from the parking position P1 to the non-parking position P2 in response to the rotation of the manual shaft 81, the lever 72 and the support portion 73 move to the right side (-Y side). When the support portion 73 moves to the right, the end portion 77c lifted by the support portion 73 moves downward by its own weight and the elastic force from the coil spring 79, and the parking lock arm 77 rotates counterclockwise when viewed from the left side (+ Y side) about the rotation axis J5. Thereby, the meshing portion 77b moves downward and away from the parking lock gear 53, and is disengaged from the tooth portions 53 a. In fig. 6, the parking lock arm 77 in a state of being disengaged from the parking lock gear 53 is indicated by a two-dot chain line.

When the parking lock arm 77 is disengaged from the parking lock gear 53, the support portion 73 is also in the non-parking position P2, and the entire movable member 70a is in the non-parking position P2. That is, when the movable member 70a is located at the non-parking position P2, the parking lock arm 77 is disengaged from the parking lock gear 53. The support portion 73 is located on the right side (-Y side) of the parking lock arm 77 at the non-parking position P2. By disengaging the parking lock arm 77 from the parking lock gear 53, the parking lock gear 53 is brought into an unlocked state. Thereby, the lock of the rotation of the axle is released. As shown in fig. 7, the parking lock arm 77 is supported from below by the tubular member 72d at the non-parking position P2.

Here, as shown in fig. 7 to 9, in the present embodiment, when moving from the non-parking position P2 to the parking position P1, the support portion 73 moves from a position on the right side (-Y side) of the parking lock arm 77 to the left side (+ Y side) and enters between the parking lock arm 77 and the guide member 75 in the vertical direction Z. At this time, according to the present embodiment, since the end portion 77c of the parking lock arm 77 has the inclined portion 77d, the support portion 73 is easily inserted between the parking lock arm 77 and the guide member 75 in the vertical direction Z. This allows the parking lock arm 77 to be easily moved by the support portion 73.

As shown in fig. 6, the guide member 75 supports the movable member 70a so as to be movable in the left-right direction Y. In the present embodiment, the guide member 75 supports the movable member 70a from below. The guide member 75 is fixed to the inner surface of the housing 10. More specifically, the guide member 75 is fixed to the inner surface of the gear housing 12. The guide member 75 has a base portion 75a, a contact portion 75b, an arm portion 75c, a fitting convex portion 75f, a positioning portion 75d, and a protrusion portion 75 e.

As shown in fig. 11, in the present embodiment, the base portion 75a has a cylindrical shape centered on the central axis J6. The contact portion 75b protrudes upward from the base portion 75 a. The contact portion 75b is a portion that contacts the movable member 70a and supports the movable member 70 a. In the present embodiment, the contact portion 75b contacts the support portion 73 or the tubular member 72d of the movable member 70a from below, and supports the movable member 70a from below. When viewed in the left-right direction Y, the surface of the contact portion 75b on the movable member 70a side is an arc-shaped curved surface 75g recessed on the side opposite to the movable member 70a side. Therefore, the support portion 73 having the tapered surface 73c can be stably supported. In the present embodiment, the curved surface 75g is an upper surface of the contact portion 75b, and has an arc shape recessed downward when viewed in the left-right direction Y. The arm portion 75c extends outward from the base portion 75a in a radial direction around the central axis J6. In the present embodiment, the arm portion 75c extends from the base portion 75a to the front side. The arm portion 75c has a quadrangular prism shape, for example.

The fitting projection 75f projects in the left-right direction Y from the base 75 a. In the present embodiment, the fitting projection 75f projects leftward from the base 75 a. The fitting projection 75f has a cylindrical shape centered on the central axis J6. The fitting convex portion 75f is fitted in the fitting concave portion 12 f. Thereby, the guide member 75 is positioned with respect to the housing 10 in the radial direction centering on the central axis J6.

The base portion 75a and the fitting projection portion 75f are provided with a through hole 75h, and the through hole 75h penetrates the base portion 75a and the fitting projection portion 75f in the left-right direction Y. That is, the guide member 75 has a through hole 75 h. The through hole 75h penetrates the guide member 75 in the left-right direction Y. The through hole 75h has a circular shape centered on the central axis J6 when viewed in the left-right direction Y. The screw 90 passes through the through hole 75h from the right side. The screw 90 passed through the through hole 75h is screwed into the internal screw hole 12 g. Thereby, the guide member 75 is positioned and fixed in the left-right direction Y with respect to the housing 10.

Here, the direction in which the screw 90 is screwed into the internally threaded hole 12g is a clockwise direction when viewed from the right side with the center axis J6 as the center. That is, the direction in which the screw 90 is screwed into the internal screw hole 12g is the positive direction of the circumferential direction θ, that is, the arrow direction of the circumferential direction θ as appropriately illustrated.

The positioning portion 75d is located outward of the base portion 75a in the radial direction centered on the center axis J6. The positioning portion 75d is in contact with a portion of the inner surface of the case 10 that faces in the circumferential direction θ around the central axis J6. Thereby, the guide member 75 is positioned in the circumferential direction θ with respect to the housing 10.

As described above, according to the present embodiment, the guide member 75 can be positioned in the circumferential direction θ around the central axis J6 by the inner surface of the housing 10. Therefore, the guide member 75 can be fixed by 1 screw 90, and the guide member 75 can be suppressed from rotating about the central axis J6. Therefore, the guide member 75 can be positioned in the housing 10 by only 1 screw 90 and firmly fixed. Therefore, when the guide member 75 is fixed to the housing 10, it is not necessary to screw a plurality of screws, and the number of steps for fixing the guide member 75 can be reduced. Thus, in the drive device 1, the number of steps for disposing the parking switch mechanism 70 inside the housing 10 can be reduced.

In addition, the guide member 75 can be easily reduced in size compared to the case where the guide member 75 is fixed by a plurality of screws. Therefore, the space for disposing the guide member 75 inside the housing 10 can be reduced. In addition, it is not necessary to provide a plurality of fixing portions 12e for fixing the guide member 75 on the housing 10. Therefore, the degree of freedom of the shape of the housing 10 can be improved.

In addition, according to the present embodiment, the guide member 75 is provided with the fitting convex portion 75f that fits into the fitting concave portion 12 f. Therefore, the guide member 75 can be suppressed from moving in the radial direction around the central axis J6. This enables the guide member 75 to be fixed to the housing 10 with high accuracy by only 1 screw 90.

In the present embodiment, the positioning portion 75d is provided on the arm portion 75 c. Therefore, the positioning portion 75d is easily arranged at a position radially outward of the base portion 75a with respect to the center axis J6. In the present embodiment, the positioning portion 75d is provided on the lower surface of the arm portion 75c in the vertical direction Z perpendicular to both the left-right direction Y and the front-rear direction X in which the arm portion 75c extends. In the present embodiment, the positioning portion 75d protrudes from the arm portion 75c in the vertical direction Z. Therefore, the positioning portion 75d is easily brought into contact with the inner surface of the housing 10, and the guide member 75 is easily positioned in the circumferential direction θ. In the present embodiment, the positioning portion 75d protrudes downward from the tip end portion of the arm portion 75 c. The dimension of the positioning portion 75d in the left-right direction Y is the same as the dimension of the arm portion 75c in the left-right direction Y, for example.

In the present embodiment, the inner surface of the case 10 with which the positioning portion 75d is in contact is the positioning surface 12 h. The positioning surface 12h is a front end of a lower portion of the inner surface of the peripheral wall portion 12 c. The positioning surface 12h is a flat surface facing upward. The positioning surface 12h is perpendicular to the vertical direction Z. The positioning surface 12h extends in the left-right direction Y. As shown in fig. 4, the positioning surface 12h protrudes upward from the other portion of the inner surface of the peripheral wall portion 12c located on the lower side.

As shown in fig. 11, the positioning surface 12h is located on one side (+ θ side) in the direction in which the screw 90 is screwed in the circumferential direction θ with respect to the positioning portion 75 d. Thereby, the positioning portion 75d is in contact with a portion of the inner side surface of the housing 10 that is opposed to one side in the direction in which the screw 90 is screwed in the circumferential direction θ. Therefore, even when the guide member 75 rotates together when the screw 90 is screwed, the direction in which the guide member 75 rotates together is the direction in which the positioning portion 75d is pressed against the positioning surface 12 h. This can prevent the positioning portion 75d from separating from the positioning surface 12h when the screw 90 is screwed in. Therefore, the guide member 75 can be easily fixed by the screw 90 in a state where the guide member 75 is accurately positioned in the circumferential direction θ. Further, for example, by utilizing the co-rotation of the guide member 75, the guide member 75 can be simultaneously positioned in the circumferential direction θ when the screw 90 is screwed in.

As shown in fig. 6, the projection 75e projects outward in the radial direction from the tip end of the arm 75c about the central axis J6. In the present embodiment, the projection 75e projects forward from a portion on the right side (-Y side) among the front side (+ X side) ends of the arm 75 c.

The plate spring member 76 is fixed to the guide member 75. In the present embodiment, the plate spring member 76 is fixed to the upper surface of the arm portion 75 c. The leaf spring member 76 has a leaf spring main body portion 76a, a protruding portion 76b, and a rotation stopper portion 76 c.

The plate spring main body portion 76a has a plate shape with a plate surface facing the vertical direction Z. The plate spring main body portion 76a extends rightward (-Y side) from the arm portion 75 c. The plate spring main body portion 76a extends to the lower side of the rod coupling portion 71. The left end (+ Y side) of the plate spring main body portion 76a is fixed to the arm portion 75c by a screw 91. The leaf spring main body portion 76a has a slit 76d in a right side portion. The slit 76d penetrates the plate spring main body portion 76a in the vertical direction Z. The slit 76d extends in the left-right direction Y. The left portion of the lower end of the rod coupling portion 71 is inserted in the slit 76 d.

The projecting portion 76b projects upward from the plate spring main body portion 76 a. More specifically, the protruding portion 76b protrudes upward from the end portion on the right side (Y side) of the plate spring main body portion 76 a. When the movable member 70a is located at the parking position P1, the protruding portion 76b is inserted into the recessed portion 71a and engages with the inner surface of the recessed portion 71a in the left-right direction Y. This can maintain the rod connecting portion 71 and the rod 72 at the parking position P1.

In particular, when the coil spring 74 is provided as in the present embodiment, the coil spring 74 is compressively deformed by the contact of the meshing portion 77b with the tooth portion 53a, and the reaction force of the elastic force generated thereby is applied to the rod 72 and the rod coupling portion 71 rightward (-Y direction). Even in such a case, according to the present embodiment, the protrusion 76b is engaged with the recess 71a, so that the rod coupling portion 71 can be prevented from moving to the right side (-Y side). Therefore, the rod coupling portion 71 and the rod 72 can be stably maintained at the parking position P1.

On the other hand, when the lever coupling portion 71 is moved from the parking position P1 to the non-parking position P2 by rotating the manual shaft 81 by the electric actuator 80, the leaf spring main body portion 76a is pressed downward by the lever coupling portion 71 and is elastically deformed. Thereby, the protruding portion 76b is disengaged from the recessed portion 71 a. Here, when the plate spring main body portion 76a is elastically deformed, a reaction force of the elastic force thereof is applied to the arm portion 75c to which the plate spring main body portion 76a is fixed. In the present embodiment, the plate spring member 76 is fixed to the upper surface of the arm portion 75 c. Further, a reaction force of the elastic force of the plate spring main body portion 76a is exerted downward on the upper side surface of the arm portion 75 c. That is, the reaction force of the elastic force of the plate spring main body portion 76a is applied in a direction in which the positioning portion 75d provided on the lower surface of the arm portion 75c is pressed against the positioning surface 12 h. Thereby, even if the plate spring member 76 is elastically deformed, the loosening of the screw 90 can be suppressed, and the separation of the positioning portion 75d from the positioning surface 12h can be suppressed.

When the movable member 70a is located at the non-parking position P2, the protruding portion 76b is inserted into the recessed portion 71b and engages with the inner surface of the recessed portion 71b in the left-right direction Y. This can maintain the lever connecting portion 71 and the lever 72 at the non-parking position P2.

The rotation stopper 76c protrudes downward from the edge portion on the front side (+ X side) of the left side (+ Y side) end of the leaf spring main body portion 76 a. The rotation stopper 76c is located on the front side of the front end of the arm 75 c. The rotation stopper 76c is engaged with the protrusion 75e from the left side. Thereby, when the plate spring member 76 is fixed by the screw 91, the plate spring member 76 can be prevented from rotating together. Therefore, the positional deviation of the plate spring member 76 can be suppressed.

The switching control of the parking switching mechanism 70 is performed by the control unit 84 of the electric actuator 80. The control unit 84 determines the rotation angle Φ of the shift motor 82 required to move the movable member 70a from the non-parking position P2 to the parking position P1 before the initial switching control of the parking switching mechanism 70 is performed. In the present embodiment, the rotation angle Φ of the shift motor 82 is set to zero when the movable member 70a is located at the non-parking position P2.

The control unit 84 moves the movable member 70a leftward from the non-parking position P2 shown in fig. 7 to the position shown in fig. 10, and brings the left end of the movable member 70a into contact with the inner wall surface 10a of the housing 10. The control portion 84 detects a 1 st rotation angle Φ 1 by the encoder 83, the 1 st rotation angle Φ 1 being the rotation angle Φ of the shift motor 82 when the shift motor is moved from the non-parking position P2 where the parking lock arm 77 is disengaged from the parking lock gear 53 to the position where the left end of the movable member 70a abuts against the inner wall surface 10 a. As shown in fig. 10, the parking lock arm 77 is supported from below by the 1 st portion 73a and meshes with the parking lock gear 53 at a position where the left end portion of the movable member 70a contacts the inner wall surface 10a of the housing 10.

In the present embodiment, the inner wall surface 10a is an inner surface of the side wall portion 12d of the gear housing 12. The control unit 84 detects an increase in load applied to the shift motor 82 by, for example, a torque sensor not shown, and detects that the movable member 70a is in contact with the inner wall surface 10 a.

Information required to position the movable member 70a in the non-parking position P2 is stored in the control unit 84 in advance, for example. Thus, the control unit 84 can control the shift motor 82 so that the movable member 70a is positioned at the non-parking position P2. The information required to position the movable member 70a in the non-parking position P2 includes, for example, the rotational position of the shift motor 82 at which the rotational angle Φ of the shift motor 82 is zero. In addition, when the drive device 1 is assembled, the parking switching mechanism 70 may be assembled in a state where the movable member 70a is located at the non-parking position P2, for example.

The control unit 84 calculates the 2 nd rotation angle φ 2, which is smaller than the 1 st rotation angle φ 1, from the detected 1 st rotation angle φ 1. Specifically, the control unit 84 calculates the 2 nd rotation angle Φ 2 based on a predetermined error value and a safety factor stored in the control unit 84. The predetermined error value is a rotation angle amount of the shift motor 82 when the movable member 70a is moved in the left-right direction Y by the same amount as the estimated maximum amount of deviation of the relative position of the movable member 70a and the inner wall surface 10a in the left-right direction Y. The predetermined error value is determined based on an assembly tolerance of the drive device 1, a dimensional tolerance of each part of the drive device 1, a positioning tolerance of the electric actuator 80 with respect to the movable member 70a, and the like. The 2 nd rotation angle φ 2 is a value obtained by subtracting a value obtained by multiplying a predetermined error value by a safety ratio from the 1 st rotation angle φ 1.

As shown in fig. 7, in the present embodiment, a moving amount L3 of the movable member 70a in the left-right direction Y when the shift motor 82 is rotated by an amount corresponding to a difference between the 1 st rotation angle Φ 1 and the 2 nd rotation angle Φ 2 is smaller than a dimension L1 of the 1 st segment 73a in the left-right direction Y. The difference between the 1 st rotation angle φ 1 and the 2 nd rotation angle φ 2 is a value obtained by multiplying a predetermined error value by a safety factor. The moving amount L3 is the distance in the left-right direction Y between the left end of the movable member 70a and the inner wall surface 10a in the parking position P1.

The controller 84 can move the movable member 70a from the non-parking position P2 to the parking position P1 where the parking lock arm 77 is engaged with the parking lock gear 53 by rotating the shift motor 82 at the 2 nd rotation angle Φ 2 as a target value.

In the present embodiment, the control unit 84 rotates the shift motor 82 to the 2 nd rotation angle Φ 2 by the 2 nd stage control. As shown in fig. 12, the period for rotating the shift motor 82 from zero to the 2 nd rotation angle Φ 2 includes the 1 st control period CP1 and the 2 nd control period CP 2. In fig. 12, the vertical axis represents the rotation angle Φ, and the horizontal axis represents the time t. In fig. 12, the time t is zero at which the movable member 70a starts to move from the non-parking position P2 to the parking position P1.

In the 1 st control period CP1, the control portion 84 rotates the shift motor 82 through open-loop control with the 3 rd rotation angle Φ 3 smaller than the 2 nd rotation angle Φ 2 as a target value. In the present embodiment, the 3 rd rotation angle Φ 3 is the rotation angle Φ of the shift motor 82 when the position of the left end of the movable member 70a is the position P3 shown in fig. 8. As shown in fig. 8, at a position P3, the parking lock arm 77 is supported from below by the end portion on the right side of the cylindrical member 72 d. In the present embodiment, the amount L4 of movement of the movable member 70a in the left-right direction Y when the shift motor 82 is rotated by the difference between the 2 nd rotation angle Φ 2 and the 3 rd rotation angle Φ 3 is equal to or greater than the dimension L2 in the left-right direction Y of the 2 nd segment 73 b. As shown in fig. 7, the moving amount L4 is the distance in the left-right direction Y between the position P3 of the left end of the movable member 70a and the parking position P1. In the present embodiment, the moving amount L4 is larger than the dimension L2 of the 2 nd part 73b in the left-right direction Y.

As shown in fig. 12, in the 1 st control period CP1, the rotation angle Φ changes linearly, for example. When the encoder 83 detects that the rotation angle Φ is the 3 rd rotation angle Φ 3, the control unit 84 switches control so that the control period is shifted from the 1 st control period CP1 to the 2 nd control period CP 2.

In the 2 nd control period CP2, the control portion 84 rotates the shift motor 82 by feedback control with the 2 nd rotation angle Φ 2 as a target value. In the present embodiment, the control unit 84 performs feedback control of the shift motor 82 using the measurement value of the encoder 83. The feedback gain in the feedback control of the CP2 during the 2 nd control is relatively small. In the 2 nd control period CP2, the rotation angle Φ smoothly changes in a curve, for example, in such a manner that an overshoot is not generated with respect to the 2 nd rotation angle Φ 2. When the encoder 83 detects that the rotation angle Φ is the 2 nd rotation angle Φ 2, the control portion 84 stops the rotation of the shift motor 82. Thereby, the control portion 84 can move the movable member 70a to the parking position P1.

As described above, in the present embodiment, the control unit 84 rotates the shift motor 82 by the open-loop control with the 3 rd rotation angle Φ 3 as the target value, and then rotates the shift motor 82 by the feedback control with the 2 nd rotation angle Φ 2 as the target value, thereby moving the movable member 70a from the non-parking position P2 to the parking position P1.

The timing of the control for calculating the 2 nd rotation angle Φ 2 by bringing the movable member 70a into contact with the inner wall surface 10a is not particularly limited as long as the control is performed at least 1 time before the parking switch mechanism 70 is first switched. The control of calculating the 2 nd rotation angle Φ 2 may be performed periodically.

For example, a case is considered in which a predetermined value of the rotation angle Φ of the shift motor 82 for moving the movable member 70a to the parking position P1 is stored in the control portion 84 in advance. In this case, if the predetermined value is too small, the movable member 70a may not be sufficiently moved leftward due to variations caused by assembly tolerances and the like. In this case, for example, the parking lock arm 77 is supported from below by the 2 nd portion 73b of the support portion 73, and there is a possibility that the parking lock arm 77 does not engage with the parking lock gear 53. On the other hand, if the predetermined value is too large, the movable member 70a may collide with the inner wall surface 10a and damage the parking switch mechanism 70.

In contrast, according to the present embodiment, as described above, the movable member 70a is brought into contact with the inner wall surface 10a by the control unit 84, whereby the 2 nd rotation angle Φ 2, which is the rotation angle Φ of the shift motor 82 required to move the movable member 70a to the parking position P1, can be obtained. Therefore, even when the position of the movable member 70a is displaced, the value of the 2 nd rotation angle Φ 2 can be set to a value at which the movable member 70a can be brought as close as possible to the inner wall surface 10a while the movable member 70a is appropriately suppressed from colliding with the inner wall surface 10 a. This can suppress insufficient movement of the movable member 70a to the left, and can support the parking lock arm 77 from below by the 1 st portion 73a of the support portion 73 at the parking position P1. Therefore, it is possible to suppress the parking lock arm 77 from being disengaged from the parking lock gear 53 when the parking switch mechanism 70 is switched to the locked state. Further, the movable member 70a can be prevented from excessively moving to the left side and colliding with the inner wall surface 10 a. As described above, according to the present embodiment, in the drive device 1, it is possible to suppress damage to the parking switch mechanism 70 and to suppress the inability to lock the rotation of the axle.

In addition, according to the present embodiment, the amount L3 of movement of the movable member 70a in the left-right direction Y when the shift motor 82 is rotated by the amount corresponding to the difference between the 1 st rotation angle Φ 1 and the 2 nd rotation angle Φ 2 is smaller than the dimension L1 of the 1 st segment 73a in the left-right direction Y. Here, the position of the movable member 70a when the shift motor 82 is rotated by the 1 st rotation angle Φ 1 is a position where the left end portion of the movable member 70a contacts the inner wall surface 10a and the parking lock arm 77 is supported from below by the 1 st portion 73 a. Therefore, if the movement amount is smaller than the dimension L1 of the 1 st portion 73a, even if the movable member 70a moves to the right side from the position at which the shift motor 82 is rotated by the 1 st rotation angle Φ 1, the state in which the parking lock arm 77 is supported from below by the 1 st portion 73a is easily maintained. Therefore, by determining the 2 nd rotation angle Φ 2 within the range in which the moving amount L3 is smaller than the dimension L1 of the 1 st part 73a in the left-right direction Y, the parking lock arm 77 is more easily brought into a state of being supported from below by the 1 st part 73a when the shift motor 82 is rotated by the 2 nd rotation angle Φ 2. Therefore, it is possible to further suppress the parking lock arm 77 from being engaged with the parking lock gear 53 when the parking switch mechanism 70 is switched to the locked state. Therefore, the vehicle can be further prevented from being unable to lock the rotation of the axle of the vehicle.

Further, according to the present embodiment, after the shift motor 82 is rotated by the open loop control with the 3 rd rotation angle Φ 3 smaller than the 2 nd rotation angle Φ 2 as the target value, the control portion 84 rotates the shift motor 82 by the feedback control with the 2 nd rotation angle Φ 2 as the target value, thereby moving the movable member 70a from the non-parking position P2 to the parking position P1. Therefore, the movable member 70a can be moved faster by the open-loop control than in the case of performing the feedback control until the rotation angle Φ of the shift motor 82 becomes the 3 rd rotation angle Φ 3. On the other hand, when the rotation angle Φ is larger than the 3 rd rotation angle Φ 3, the movable member 70a can be moved with high accuracy by the feedback control. This can shorten the time required to switch the parking switch mechanism 70 from the unlocked state to the locked state, and can accurately move the movable member 70a to the parking position P1.

In addition, according to the present embodiment, the amount L4 of movement of the movable member 70a in the left-right direction Y when the shift motor 82 is rotated by the amount corresponding to the difference between the 2 nd rotation angle Φ 2 and the 3 rd rotation angle Φ 3 is equal to or greater than the dimension L2 in the left-right direction Y of the 2 nd segment 73 b. Therefore, the 3 rd rotation angle Φ 3 can be made smaller, and the timing of switching from the 1 st control period CP1 to the 2 nd control period CP2 can be made earlier. That is, the timing of switching to the feedback control can be made earlier. This makes it possible to increase the length of the 2 nd control period CP2 in which feedback control is performed, and to change the rotation angle Φ more smoothly in the 2 nd control period CP 2. Therefore, when switching from the open-loop control to the feedback control, it is possible to suppress a rapid change in the rotation speed of the shift motor 82, and to suppress occurrence of a shock due to the rapid change in the rotation speed of the shift motor 82.

The present invention is not limited to the above-described embodiments, and other configurations may be adopted. The control unit 84 may control the shift motor 82 as shown in fig. 13. In the 1 st control period CP1a of fig. 13, the control portion 84 rotates the shift motor 82 by feedback control with the 3 rd rotation angle Φ 3 as a target value. When the value of the rotation angle Φ is within the range of ± Δ Φ with respect to the 3 rd rotation angle Φ 3, the control unit 84 switches control so that the control period is shifted from the 1 st control period CP1a to the 2 nd control period CP 2. That is, in the control method of fig. 13, the control unit 84 rotates the shift motor 82 by the feedback control with the 3 rd rotation angle Φ 3 as the target value, and then rotates the shift motor 82 by the feedback control with the 2 nd rotation angle Φ 2 as the target value, thereby moving the movable member 70a from the non-parking position P2 to the parking position P1. With this configuration, the entire control of the shift motor 82 when the movable member 70a is moved from the non-parking position P2 to the parking position P1 can be feedback-controlled. Therefore, the movable member 70a can be moved with higher accuracy.

The feedback gain of the feedback control in the 1 st control period CP1a is larger than the feedback gain of the feedback control in the 2 nd control period CP 2. That is, the feedback gain in the feedback control with the 3 rd rotation angle Φ 3 as the target value is larger than the feedback gain in the feedback control with the 2 nd rotation angle Φ 2 as the target value. Therefore, the length of the 1 st control period CP1a can be made shorter. Thus, the movable member 70a can be moved with high accuracy by the feedback control, and the time required to switch the parking switch mechanism 70 from the unlocked state to the locked state can be shortened.

The 3 rd rotation angle Φ 3 may be stored in the control unit 84 in advance without depending on the control of bringing the movable member 70a into contact with the inner wall surface 10 a. The control unit 84 may move the movable member 70a from the non-parking position P2 to the parking position P1 by performing control with the 2 nd rotation angle Φ 2 as a target value from the beginning, instead of performing control with the 3 rd rotation angle Φ 3 as a target value. When the parking switching mechanism 70 is switched, the control unit 84 may rotate the shift motor 82 only by the open-loop control without performing the feedback control.

The control unit 84 may calculate the rotational position of the shift motor 82 at which the movable member 70a is in the non-parking position P2, based on the rotational position of the shift motor 82 when the movable member 70a is brought into contact with the inner wall surface 10 a. In this case, the control unit 84 calculates the 1 st rotation angle Φ 1 and the 2 nd rotation angle Φ 2 as the position where the rotation angle Φ is zero, which is the position where the movable member 70a is rotated in the reverse direction by the predetermined rotation angle from the rotation position of the shift motor 82 when it is in contact with the inner wall surface 10 a. The predetermined rotation angle is, for example, a value at which the amount of movement of the movable member 70a in the left-right direction Y when the shift motor 82 is rotated by the predetermined rotation angle is equal to or larger than the dimension of the support portion 73 in the left-right direction Y. The predetermined rotation angle is stored in the control unit 84 in advance, for example. By calculating the non-parking position P2 in this way, the axle can be suppressed from being locked at the non-parking position P2.

The 1 st direction and the 2 nd direction are not particularly limited as long as they are perpendicular to each other. The respective structures described in this specification can be appropriately combined within a range not inconsistent with each other.

Claims

1. A drive device mounted on a vehicle, wherein,

the driving device comprises:

a motor;

a transmission mechanism having a gear, the transmission mechanism transmitting torque output from the motor to an axle of the vehicle;

a parking lock gear fixed to the gear and coupled to the axle;

a parking switching mechanism having a movable member that moves in a 1 st direction and a parking lock arm that moves in a 2 nd direction perpendicular to the 1 st direction in accordance with the movement of the movable member in the 1 st direction, the parking switching mechanism being capable of locking rotation of the axle by engaging with the parking lock gear;

a housing that houses the motor, the transmission mechanism, the parking lock gear, and the parking switching mechanism;

an electric actuator having a shift motor that moves the movable member in the 1 st direction in accordance with a shift operation of the vehicle, and an encoder that detects a rotation angle of the shift motor; and

a control unit that controls the electric actuator,

the movable member has a support portion that supports the parking lock arm from one side in the 2 nd direction,

the support portion has:

part 1; and

a 2 nd portion connected to one side of the 1 st portion in the 1 st direction, an outer diameter of which becomes smaller toward the one side in the 1 st direction,

the parking lock arm is supported by the 1 st portion from the 2 nd direction side to engage with the parking lock gear at a position where an end portion of the movable member on the 1 st direction side contacts with an inner wall surface of the housing,

the control unit detects a 1 st rotation angle by the encoder, the 1 st rotation angle being a rotation angle of the shift motor when the shift motor is moved from a non-parking position where the parking lock arm is disengaged from the parking lock gear to a position where an end portion of the movable member on the 1 st direction side abuts against an inner wall surface of the housing,

the control portion calculates a 2 nd rotation angle smaller than the 1 st rotation angle from the 1 st rotation angle,

the control portion rotates the shift motor with the 2 nd rotation angle as a target value, thereby moving the movable member from the non-parking position to a parking position where the parking lock arm is engaged with the parking lock gear.

2. The drive apparatus according to claim 1,

a movement amount of the movable member in the 1 st direction when the shift motor is rotated by an amount corresponding to a difference between the 1 st rotation angle and the 2 nd rotation angle is smaller than a dimension of the 1 st portion in the 1 st direction.

3. The drive device according to claim 1 or 2,

the control portion rotates the shift motor by open-loop control with a 3 rd rotation angle smaller than the 2 nd rotation angle as a target value, and then rotates the shift motor by feedback control with the 2 nd rotation angle as the target value, thereby moving the movable member from the non-parking position to a parking position where the parking lock arm is engaged with the parking lock gear.

4. The drive device according to claim 1 or 2,

the control portion rotates the shift motor by feedback control with a 3 rd rotation angle smaller than the 2 nd rotation angle as a target value, and then rotates the shift motor by feedback control with the 2 nd rotation angle as a target value, thereby moving the movable member from the non-parking position to a parking position where the parking lock arm is engaged with the parking lock gear.

5. The drive apparatus according to claim 4,

the feedback gain in the feedback control with the 3 rd rotation angle as the target value is larger than the feedback gain in the feedback control with the 2 nd rotation angle as the target value.

6. The drive apparatus according to claim 3,

a movement amount of the movable member in the 1 st direction when the shift motor is rotated by an amount corresponding to a difference between the 2 nd rotation angle and the 3 rd rotation angle is equal to or greater than a dimension of the 2 nd portion in the 1 st direction.

7. The drive apparatus according to claim 4,