JP2020139579A - Drive unit - Google Patents

Abstract

To provide a drive unit having a structure which can avoid that the rotation of an axle cannot be locked, while suppressing the damage of a parking changeover mechanism.SOLUTION: In a position in which an end part of a movable member 70a at one side in a first direction contacts with an inner wall face 10 of a housing 10, a park lock arm 77 is engaged with a park lock gear. A control part detects by using an encoder a first rotation angle being a rotation angle of a shift motor in moving a movable member from a non-parking position in which the engagement of the park lock arm and the park lock gear is released up until the end part of the movable member at one side in the first direction abuts on the inner wall face of the housing, calculates a second rotation angle smaller than the first rotation angle on the basis of the first rotation angle, and moves the movable member up to a parking position in which the park lock arm is engaged with the park lock gear from the non-parking position by rotating the shift motor with the second rotation angle as a target value.SELECTED DRAWING: Figure 10

Description

The present invention relates to a drive device.

A drive device mounted on a vehicle and equipped with a parking lock device is known. For example, Patent Document 1 describes a parking lock device including a parking rod, a cam mounted on the parking rod, and a parking lock ball that can mesh with a parking gear. The parking lock ball is moved by a cam that moves with the parking rod and meshes with the parking gear.

Japanese Unexamined Patent Publication No. 2017-52321

In the parking lock device as described above, the relative positions of the parking lock ball and the cam may deviate due to assembly tolerances, dimensional tolerances of each part, and the like. In this case, the parking lock ball could not be moved sufficiently, and there was a risk that the parking lock ball and the parking gear would not mesh with each other. Therefore, there is a risk that the rotation of the axle cannot be locked.

On the other hand, it is conceivable to increase the amount of movement of the parking rod and cam sufficiently in consideration of deviations such as tolerances. However, in this case, the parking rod may move too much and the parking rod may collide with the inner wall surface of the housing of the drive device. Therefore, there is a risk that the parking lock device will be damaged.

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

One aspect of the drive device of the present invention is a drive device mounted on a vehicle, which has a motor, gears, and a transmission mechanism that transmits torque output from the motor to the axle of the vehicle, and the above. A park lock gear fixed to a gear and connected to the axle, a movable member moving along a first direction, and a second movable member orthogonal to the first direction as the movable member moves in the first direction. A housing that houses a parking switching mechanism having a park lock arm that can lock the rotation of the axle by moving in a direction and engaging with the park lock gear, and a housing that houses the motor, the transmission mechanism, the park lock gear, and the parking switching mechanism. A shift motor that moves the movable member in the first direction based on the shift operation of the vehicle, an electric actuator having an encoder that detects the rotation angle of the shift motor, and a control unit that controls the electric actuator. , Equipped with. The movable member has a support portion that supports the park lock arm from one side in the second direction. The support portion has a first portion and a second portion that is connected to one side of the first portion in the first direction and whose outer diameter becomes smaller toward one side in the first direction. At a position where one end of the movable member in the first direction comes into contact with the inner wall surface of the housing, the park lock arm is supported by the first portion from one side in the second direction. It meshes with the park lock gear. The control unit is moved from a non-parking position where the park lock arm and the park lock gear are disengaged until one end of the movable member in the first direction abuts on the inner wall surface of the housing. The first rotation angle, which is the rotation angle of the shift motor, is detected by the encoder, a second rotation angle smaller than the first rotation angle is calculated based on the first rotation angle, and the second rotation is performed. By rotating the shift motor with an angle as a target value, the movable member is moved from the non-parking position to a parking position where the park lock arm meshes with the park lock gear.

According to one aspect of the present invention, in the drive device, it is possible to suppress damage to the parking switching mechanism and to prevent the rotation of the axle from being locked.

FIG. 1 is a perspective view showing a driving device of the present embodiment. FIG. 2 is a view of a part of the drive 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. FIG. 4 is a view of a part of the drive device of the present embodiment as viewed from the left side. 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 when the park lock gear of the present embodiment is in the unlocked state. FIG. 8 is a diagram showing another state of the movable member when the park lock gear of the present embodiment is in the unlocked state. FIG. 9 is a perspective view showing one state of the movable member when the park lock gear of the present embodiment is in the locked state. FIG. 10 is a diagram showing a state in which the movable member of the present embodiment is abutted against 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 time change of the rotation angle in the shift motor of the present embodiment. FIG. 13 is a graph showing another example of the time change of the rotation angle in the shift motor of the present embodiment.

In the following description, the vertical direction will be defined and described based on the positional relationship when the drive device 1 of the present embodiment shown in FIG. 1 is mounted on a vehicle located on a horizontal road surface. Further, in the drawings, the XYZ coordinate system is shown as a three-dimensional Cartesian coordinate system as appropriate. 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 orthogonal 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 orthogonal 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 the positional relationship 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, the direction parallel to the Z-axis direction is called "vertical direction Z", the direction parallel to the X-axis direction is called "front-back direction X", and the direction parallel to the Y-axis direction is "left-right direction Y". Called. Further, the positive side (+ Z side) in the Z-axis direction is called "upper side", and the negative side (-Z side) in the Z-axis direction is called "lower side". The positive side (+ X side) in the X-axis direction is called the "front side", and the negative side (-X side) in the X-axis direction is called the "rear side". The positive side (+ Y side) in the Y-axis direction is called the "left side", and the negative side (-Y side) in the Y-axis direction is called the "right side". In the present embodiment, the left-right direction Y corresponds to the first direction. The vertical direction Z corresponds to the second direction. The left side corresponds to one side in the first direction. The lower side corresponds to one side in the second direction.

The motor shaft J1 shown in each figure extends in the Y-axis direction, that is, in the left-right direction of the vehicle. In the following description, unless otherwise specified, the radial direction centered on the motor shaft J1 is simply referred to as the "diameter direction", and the circumferential direction centered on the motor shaft J1, that is, the axial circumference of the motor shaft J1 is simply referred to. Called "circumferential". In the present specification, the "parallel direction" includes a substantially parallel direction, and the "orthogonal direction" also includes a substantially orthogonal direction.

The drive device 1 is mounted on a vehicle powered by a motor, such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHV), and an electric vehicle (EV), and is used as the power source thereof. As shown in FIGS. 1 to 4, the drive device 1 includes a housing 10, a motor 20, a transmission mechanism 100 having a speed reducer 50 and a differential device 60, a park lock gear 53, a rotation detection device 30, and a rotation detection device 30. It includes an inverter unit 40, an electric actuator 80, and a parking switching mechanism 70.

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

The motor housing 11 has a motor housing main body portion 11a and a connecting portion 11b. As shown in FIG. 3, the motor housing main body 11a has a tubular shape that surrounds the motor shaft J1 and extends in the left-right direction Y. The motor housing body 11a opens to the right. The motor housing main body 11a accommodates the motor 20. As shown in FIG. 2, the connecting portion 11b is provided at the left end portion of the motor housing main body portion 11a. The connecting portion 11b projects to the rear side of the motor housing main body portion 11a.

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 screwed to the connecting portion 11b. Although not shown, the gear housing 12 opens to the right. The gear housing 12 has a first accommodating portion 12a and a second accommodating portion 12b. The first accommodating portion 12a is located on the left side of the motor housing main body portion 11a. The first accommodating portion 12a accommodates the speed reducing device 50 and the park lock gear 53. The second accommodating portion 12b is connected to the rear side of the first accommodating portion 12a. The second accommodating portion 12b is located on the left side of the portion of the connecting portion 11b that protrudes rearward from the motor housing main body portion 11a. The second accommodating portion 12b accommodates the differential device 60. The first accommodating portion 12a protrudes to the left side of the second accommodating portion 12b.

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

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

The fitting recess 12f is recessed to the left from the right end of the fixing portion 12e. The outer shape of the fitting recess 12f is a circular shape centered on the central axis J6 when viewed along the left-right direction Y. The female screw hole 12g is provided at the bottom of the fitting recess 12f. The female screw hole 12g is recessed to the left from the bottom surface of the fitting recess 12f. The inner edge of the female screw hole 12 g has a circular shape centered on the central axis J6 when viewed along 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 with screws. The motor cover 13 closes the opening on the right side of the motor housing main body 11a. The motor cover 13 has an accommodating recess 16 recessed on the left side in the central portion.

The motor cover 13 has a plurality of mounting portions 15. The plurality of mounting portions 15 have a columnar shape protruding to the right. The plurality of mounting portions 15 are located radially outside the accommodating 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 tightened. The housing 10 is fixed to the vehicle body as an attached body via the attachment portion 15.

As shown in FIG. 1, the plurality of mounting portions 15 are arranged along the circumferential direction. As shown in FIG. 2, the right end surface of the mounting portion 15 is a 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 portion 14 is fixed to the right side surface of the motor cover 13 with screws. The lid portion 14 has a plate shape in which the plate surface faces Y in the left-right direction. The lid portion 14 closes the opening on the right side of the accommodating recess 16.

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

In the present embodiment, the shaft 21a is a hollow shaft provided with an oil passage 21c inside. The oil contained in the housing 10 is supplied to the oil passage 21c. The oil passage 21c penetrates the shaft 21a in the left-right direction Y. The rotor body 21b is fixed to the outer peripheral surface of the shaft 21a. Although not shown, the rotor body 21b has a rotor core and a rotor magnet.

The stator 22 is located outside the rotor 21 in the radial direction of the motor shaft 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 housing main body 11a. The plurality of coils 24 are mounted on the stator core 23 via an insulator (not shown).

The transmission mechanism 100 transmits the torque output from the motor 20 to the axle of the vehicle. In the present embodiment, the rotation of the motor 20 is decelerated by the speed reducing 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 has a first gear 51, a second gear 52, and a third gear (not shown). That is, the transmission mechanism 100 has a first gear 51, a second gear 52, and a third gear (not shown). The first gear 51 is fixed to the left end of the shaft 21a. The second gear 52 rotates about a rotation shaft J3 parallel to the motor shaft J1. The differential device 60 has a ring gear 61. The torque output from the shaft 21a of the motor 20 is transmitted to the ring gear 61 of the differential device 60 via the first gear 51, the second gear 52, and the third gear in this order.

The differential device 60 is connected to the speed reducer 50 and transmits the torque output from the motor 20 to the axle of the vehicle. The differential device 60 has a function of transmitting the same torque to the axles of both the left and right wheels while absorbing the speed difference between the left and right wheels when the vehicle turns. The ring gear 61 rotates about a differential shaft J2 parallel to the motor shaft J1. The torque output from the motor 20 is transmitted to the ring gear 61 via the speed reducer 50.

The park lock gear 53 is fixed to the second gear 52. That is, in the present embodiment, the second gear 52 corresponds to the gear to which the park lock gear 53 is fixed. In the present embodiment, the park lock gear 53 is located on the left side (+ Y side) of the second gear 52. The park lock gear 53 is arranged coaxially with the second gear 52. The park lock gear 53 rotates about the rotation shaft J3. The park lock gear 53 is connected to the axle of the vehicle via a third gear (not shown) and a differential device 60. The park lock gear 53 has a plurality of tooth portions 53a.

The rotation detection 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 detection device 30 is, for example, a resolver. The rotation detection device 30 includes a resolver rotor 31 and a resolver stator 32. The resolver rotor 31 is fixed to the outer peripheral surface at the right end of the shaft 21a. As a result, the rotation detection device 30 can detect the rotation of the rotor 21 at the right end of the rotor 21. The resolver stator 32 is located on the radial outer side of the resolver rotor 31. The resolver stator 32 is fixed to the inner surface of the accommodating recess 16.

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

The inverter case 41 houses the inverter. The inverter case 41 is fixed to the housing 10. In this embodiment, the inverter case 41 is fixed to the radial outer surface of the housing 10. More specifically, the inverter case 41 is fixed to the rear portion of the radial outer surface of the motor housing main body 11a. That is, the inverter case 41 is fixed to the rear side of the housing 10 in the front-rear direction X orthogonal 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 42 and an inverter cover 43. The inverter case main body 42 has a substantially rectangular box shape that opens upward and is long in the left-right direction Y. The inverter cover 43 closes the opening on the upper side of the inverter case main body 42. The inverter cover 43 has a first cover 43a and a second cover 43b. The first cover 43a and the second cover 43b are separate members from each other. The first cover 43a covers the upper side of an inverter (not shown). The second cover 43b is located on the left side of the first cover 43a. The second cover 43b covers the upper side of a bus bar (not shown) connected to the inverter.

As shown in FIGS. 2 and 4, the electric actuator 80 is fixed to the outer surface of the housing 10. More specifically, the electric actuator 80 is fixed to the front portion of the radial outer surface of the first accommodating portion 12a in 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 orthogonal to the left-right direction Y. As shown in FIG. 6, in the present embodiment, the manual shaft 81 has a columnar 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 projects into the inside of the gear housing 12.

The shift motor 82 rotates the manual shaft 81 around the rotation shaft J4 based on the shift operation of the vehicle. The shift motor 82 rotates the manual shaft 81 to move the movable member 70a of the parking switching mechanism 70, which will be described later, in the left-right direction Y. In the present embodiment, the shift motor 82 rotates the manual shaft 81 via a speed reducer (not shown). The shift motor 82 may rotate the manual shaft 81 without using a speed reducer.

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 shaft of the shift motor 82 to detect the rotation angle φ of the shift motor 82, or measure the rotation angle of the manual shaft 81 and reduce the reduction ratio of a speed reducer (not shown). The rotation angle φ of the shift motor 82 may be indirectly detected from.

The control unit 84 controls the electric actuator 80. Information on the shift operation is input to the control unit 84 from the control device of the vehicle. Based on the shift operation information, the control unit 84 rotates the shift motor 82 at a predetermined rotation angle φ to move the movable member 70a of the parking switching mechanism 70, which will be described later, in the left-right direction Y.

The parking switching mechanism 70 is driven by the electric actuator 80 based on the shift operation of the vehicle. The parking switching mechanism 70 switches the park lock gear 53 between the locked state and the unlocked state. The parking switching mechanism 70 locks the park lock gear 53 when the vehicle gear is parked, and unlocks the park lock gear 53 when the vehicle gear is other than parking. The case where the gear of the vehicle is other than parking includes, for example, the case where the gear of the vehicle is drive, neutral, reverse, or the like. As shown in FIG. 6, the parking switching mechanism 70 includes a movable member 70a, a park lock arm 77, a guide member 75, and a leaf spring member 76.

The movable member 70a moves along the left-right direction Y based on the 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 between at least the parking position P1 and the non-parking position P2. The parking position P1 is a position in the left-right direction Y of the movable member 70a when the gear of the vehicle is parking. The non-parking position P2 is a position in the left-right direction Y of the movable member 70a when the gear of the vehicle is other than parking. 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 shown by a solid line, and the movable member 70a located at the non-parking position P2 is shown by a chain double-dashed line.

The movable member 70a has a rod connecting portion 71, a rod 72, a support portion 73, and a coil spring 74. The rod connecting portion 71 is fixed to the manual shaft 81. The rod connecting portion 71 extends in the radial direction of the manual shaft 81. In the present embodiment, the rod connecting portion 71 extends downward from the manual shaft 81. In the present embodiment, the rod connecting portion 71 has a plate shape in which the plate surface faces the front-rear direction X. The width of the rod connecting portion 71 increases as the distance from the manual shaft 81 increases in the radial direction of the manual shaft 81. The rod connecting portion 71 has recesses 71a and 71b. That is, the movable member 70a has recesses 71a and 71b.

The recesses 71a and 71b are provided at the tip of the rod connecting portion 71. The recesses 71a and 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 connecting portion 71. The recesses 71a and 71b penetrate the rod connecting portion 71 in the front-rear direction X. The recess 71a and the recess 71b are arranged side by side along the circumferential direction of the manual shaft 81. In the present embodiment, the recess 71a and the recess 71b are arranged side by side in the left-right direction Y.

The rod 72 is arranged so as to be movable along the left-right direction Y. The rod 72 has a connecting portion 72a and a rod body 72b. The connecting portion 72a has a rod shape extending in the front-rear direction X. The front end (+ X side) end of the connecting portion 72a penetrates the rod connecting portion 71 in the front-rear direction X and is fixed to the rod connecting portion 71. As a result, the rod 72 is connected to the manual shaft 81 via the rod connecting portion 71. The rod body 72b has a rod shape extending in the left-right direction Y. In the present embodiment, the rod body 72b extends from the rear end (−X side) end of the connecting portion 72a to the left side (+ Y side). The rod body 72b has a protrusion 72c at a portion closer to the connection portion 72a. A tubular member 72d extending in the left-right direction Y is fitted and fixed to the left end of the rod body 72b.

The support portion 73 supports the park lock arm 77 from below. In the present embodiment, the support portion 73 is an annular shape through which the rod body 72b is passed. The support portion 73 can move in the left-right direction Y with respect to the rod body 72b. The support portion 73 extends in the left-right direction Y. As shown in FIGS. 7 to 10, the support portion 73 has a first portion 73a and a second portion 73b. The first portion 73a is the right portion of the support portion 73. The outer diameter of the first portion 73a is uniform over the entire left-right direction Y. The outer diameter of the first portion 73a is the largest of the outer diameters of the support portion 73.

The second portion 73b is the left portion of the support portion 73. The second portion 73b is connected to the left side of the first portion 73a. The left end of the second portion 73b is pushed by the coil spring 74 and comes into contact with the right end of the tubular member 72d. The second portion 73b becomes smaller as the outer diameter becomes smaller toward the left side. The outer diameter at the right end of the second portion 73b is the same as the outer diameter at the left end of the first portion 73a. The outer diameter at the left end of the second portion 73b is larger than the outer diameter of the tubular member 72d. In the present embodiment, the outer peripheral surface of the second portion 73b is a tapered surface 73c whose outer diameter decreases toward the left side.

In FIGS. 7 and 9, the position of the left end portion of the movable member 70a located at the parking position P1 in the left-right direction Y is indicated by a alternate long and short dash line and the symbol “P1”. In FIG. 7, the position of the left end portion of the movable member 70a located at the non-parking position P2 in the left-right direction Y is indicated by a chain line and the symbol “P2”.

The coil spring 74 extends in the left-right direction Y. As shown in FIG. 6, the coil spring 74 is arranged between the support portion 73 and the protrusion 72c in the left-right direction Y. A rod body 72b is passed through the coil spring 74. The right end (−Y side) end of the coil spring 74 comes into contact with the protrusion 72c. The left end (+ Y side) end of the coil spring 74 contacts the right surface of the support 73. The coil spring 74 expands and contracts as the support portion 73 moves relative to the rod body 72b in the left-right direction Y, and applies an elastic force in the left-right direction Y to the support portion 73.

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

The park lock arm body 77a extends from the support shaft 78 to the front side (+ X side). The front end 77c of the park lock arm body 77a comes into contact with the movable member 70a from above. More specifically, the end 77c contacts the support 73 or the tubular member 72d from above. The right side (−Y side) portion of the lower surface of the end portion 77c is an inclined portion 77d located on the upper side toward the right side. The meshing portion 77b projects upward from the park lock arm main body 77a. A winding spring 79 is attached to the support shaft 78. The winding spring 79 applies an elastic force counterclockwise to the park lock arm 77 when viewed from the left side (+ Y side) about the rotation axis J5.

The park lock arm 77 moves in the vertical direction Z orthogonal to the left-right direction Y as the movable member 70a moves in the left-right direction Y. More specifically, the park lock arm 77 moves in the vertical direction Z by rotating around the rotation axis J5 as the rod 72 and the support portion 73 move in the left-right direction Y. In addition, in this specification, "the park lock arm 77 moves in the vertical direction Z" means that at least a part of the park lock arm 77 may move in the vertical direction Z.

When the rod connecting portion 71 rotates counterclockwise when viewed from the front side (+ X side) with the rotation of the manual shaft 81, the rod 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 upward by the tapered surface 73c, and the park lock arm 77 rotates clockwise when viewed from the left side (+ Y side) about the rotation axis J5. As a result, although not shown, the meshing portion 77b moves upward and approaches the park lock gear 53, and meshes with the tooth portions 53a of the park lock gear 53. In FIG. 6, the park lock arm 77 located at a position where it meshes with the park lock gear 53 is shown by a solid line.

When the park lock gear 53 and the park lock arm 77 mesh with each other, the support portion 73 is also located at the parking position P1, and the entire movable member 70a is located at the parking position P1. That is, the park lock arm 77 meshes with the park lock gear 53 connected to the axle when the movable member 70a is located at the parking position P1. The support portion 73 is sandwiched at the parking position P1 in a state of being in contact with the contact portion 75b described later in the guide member 75 and the park lock arm 77. When the park lock arm 77 meshes with the park lock gear 53, the park lock gear 53 is locked. In this way, the park lock arm 77 can lock the rotation of the axle by engaging with the park lock gear 53.

When the park lock arm 77 approaches the park lock gear 53, the meshing portion 77b may come into contact with the tooth portion 53a depending on the position of the tooth portion 53a of the park lock gear 53. In this case, the park lock arm 77 may not be able to move to a position where the meshing portion 77b meshes with the tooth portions 53a. Even in such a case, in the present embodiment, since the support portion 73 can move in the left-right direction Y with respect to the rod 72, the support portion 73 moves to the parking position P1 while the support portion 73 moves to the parking position. A state of being located on the right side (-Y side) of P1 is acceptable. As a result, it is possible to prevent the rotation of the manual shaft 81 from being hindered, and it is possible to prevent the electric actuator 80 that rotates the manual shaft 81 from being loaded.

Further, when the rod 72 is located at the parking position P1 and the support portion 73 is located on the right side (−Y side) of the parking position P1, the coil spring 74 is in a state of being compressed and deformed. Therefore, a leftward (+ Y direction) elastic force is applied to the support portion 73 by the coil spring 74. As a result, a rotational moment is applied from the coil spring 74 to the park lock arm 77 via the support portion 73 in a direction that rotates clockwise when viewed from the left side (+ Y side) about the rotation axis J5. Therefore, when the park lock gear 53 rotates and the position of the tooth portion 53a shifts, the park lock arm 77 rotates and the meshing portion 77b meshes between the tooth portions 53a.

When the rod connecting portion 71 rotates from the parking position P1 to the non-parking position P2 with the rotation of the manual shaft 81, the rod 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 receives its own weight and the elastic force from the winding spring 79 and moves downward, and the park lock arm 77 moves around the rotation axis J5. It rotates counterclockwise when viewed from the left side (+ Y side). As a result, the meshing portion 77b moves downward, separates from the park lock gear 53, and disengages from between the tooth portions 53a. In FIG. 6, the park lock arm 77 in a state of being disengaged from the park lock gear 53 is shown by a chain double-dashed line.

When the park lock arm 77 is disengaged from the park 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, the park lock arm 77 is disengaged from the park lock gear 53 when the movable member 70a is located at the non-parking position P2. The support portion 73 is located on the right side (−Y side) of the park lock arm 77 at the non-parking position P2. When the park lock arm 77 is disengaged from the park lock gear 53, the park lock gear 53 is unlocked. This unlocks the rotation of the axle. As shown in FIG. 7, at the non-parking position P2, the park lock arm 77 is supported from below by the tubular member 72d.

Here, as shown in FIGS. 7 to 9, in the present embodiment, when the support portion 73 moves from the non-parking position P2 to the parking position P1, the support portion 73 is on the right side (−Y side) of the park lock arm 77. It moves from the position to the left side (+ Y side) and enters between the park 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 park lock arm 77 has the inclined portion 77d, the support portion 73 easily enters between the park lock arm 77 and the guide member 75 in the vertical direction Z. As a result, it is easy to move the park lock arm 77 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 75e.

As shown in FIG. 11, in the present embodiment, the base portion 75a is a columnar shape centered on the central axis J6. The contact portion 75b projects upward from the base portion 75a. The contact portion 75b is a portion that contacts the movable member 70a and supports the movable member 70a. 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 to support the movable member 70a from below. The surface of the contact portion 75b on the movable member 70a side is an arc-shaped curved surface 75g that is concave on the opposite side to the movable member 70a side when viewed along the left-right direction Y. Therefore, the support portion 73 having the tapered surface 73c can be stably supported. In the present embodiment, the curved surface 75g is the upper surface of the contact portion 75b, and has an arc shape that is concave downward when viewed along the left-right direction Y. The arm portion 75c extends outward from the base portion 75a in the radial direction centered on the central axis J6. In this embodiment, the arm portion 75c extends anteriorly from the base portion 75a. The arm portion 75c is, for example, a square columnar shape.

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

The base portion 75a and the fitting convex portion 75f are provided with a through hole 75h that penetrates the base portion 75a and the fitting convex portion 75f in the left-right direction Y. That is, the guide member 75 has a through hole 75h. 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 along the left-right direction Y. A screw 90 is passed through the through hole 75h from the right side. The screw 90 passed through the through hole 75h is tightened into the female screw hole 12g. As a result, 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 tightened into the female screw hole 12g is a clockwise direction when viewed from the right side with the central axis J6 as the center. That is, the direction in which the screw 90 is tightened into the female screw hole 12g is the positive direction in the circumferential direction θ, that is, the direction of the arrow in the circumferential direction θ shown in the figure as appropriate.

The positioning portion 75d is located outside the base portion 75a in the radial direction centered on the central axis J6. The positioning portion 75d comes into contact with a portion of the inner side surface of the housing 10 that faces the circumferential direction θ centered on the central axis J6. As a result, 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 about the central axis J6 by using the inner side surface of the housing 10. Therefore, it is possible to prevent the guide member 75 from rotating around the central axis J6 while fixing the guide member 75 with one screw 90. Therefore, the guide member 75 can be firmly fixed while being positioned with respect to the housing 10 by using only one screw 90. Therefore, when fixing the guide member 75 to the housing 10, it is not necessary to tighten a plurality of screws, and the time and effort for fixing the guide member 75 can be reduced. As a result, in the drive device 1, it is possible to reduce the time and effort required to arrange the parking switching mechanism 70 inside the housing 10.

Further, the guide member 75 can be easily made smaller than the case where the guide member 75 is fixed with a plurality of screws. Therefore, the space for arranging the guide member 75 inside the housing 10 can be reduced. Further, it is not necessary to provide a plurality of fixing portions 12e for fixing the guide member 75 to the housing 10. Therefore, the degree of freedom in the shape of the housing 10 can be improved.

Further, according to the present embodiment, the guide member 75 is provided with a fitting convex portion 75f that is fitted into the fitting concave portion 12f. Therefore, it is possible to prevent the guide member 75 from moving in the radial direction about the central axis J6. As a result, the guide member 75 can be fixed to the housing 10 with high positional accuracy using only one screw 90.

In the present embodiment, the positioning portion 75d is provided on the arm portion 75c. Therefore, it is easy to arrange the positioning portion 75d outside the base portion 75a in the radial direction centered on the central 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 orthogonal 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 projects from the arm portion 75c in the vertical direction Z. Therefore, the positioning portion 75d can be easily brought into contact with the inner side surface of the housing 10, and the guide member 75 can be easily positioned in the circumferential direction θ. In the present embodiment, the positioning portion 75d projects downward from the tip portion of the arm portion 75c. The dimension of the positioning portion 75d in the left-right direction Y is, for example, the same as the dimension of the arm portion 75c in the left-right direction Y.

In the present embodiment, the inner surface of the housing 10 with which the positioning portion 75d comes into contact is the positioning surface 12h. The positioning surface 12h is a front end portion of the inner side surface of the peripheral wall portion 12c located on the lower side. The positioning surface 12h is a flat surface facing upward. The positioning surface 12h is orthogonal 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 projects upward from the other portion of the inner side surface of the peripheral wall portion 12c that is located on the lower side.

As shown in FIG. 11, the positioning surface 12h is located on the side (+ θ side) in the circumferential direction θ in which the screw 90 is tightened with respect to the positioning portion 75d. As a result, the positioning portion 75d comes into contact with the portion of the inner surface of the housing 10 that faces the side in the circumferential direction θ in which the screw 90 is tightened. Therefore, even when the guide member 75 rotates together when the screw 90 is tightened, 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 12h. As a result, when the screw 90 is tightened, the positioning portion 75d can be prevented from being separated from the positioning surface 12h. Therefore, the guide member 75 can be easily fixed by the screw 90 while 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 positioned in the circumferential direction θ at the same time when the screw 90 is tightened.

As shown in FIG. 6, the protrusion 75e projects outward from the tip of the arm 75c in the radial direction about the central axis J6. In the present embodiment, the protruding portion 75e protrudes forward from the right side (−Y side) portion of the front side (+ X side) end portion of the arm portion 75c.

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

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

The protruding portion 76b projects upward from the leaf spring main body portion 76a. More specifically, the protruding portion 76b projects upward from the right (−Y side) end of the leaf spring main body portion 76a. When the movable member 70a is located at the parking position P1, the protruding portion 76b is inserted into the recess 71a and hooked in the left-right direction Y with respect to the inner surface of the recess 71a. As a result, the rod connecting portion 71 and the rod 72 can be maintained at the parking position P1.

In particular, when the coil spring 74 is provided as in the present embodiment, the reaction force due to the elastic force generated when the meshing portion 77b comes into contact with the tooth portion 53a and the coil spring 74 is compressed and deformed is applied to the rod 72 and the rod connecting portion 71. On the other hand, it is added to the right (-Y direction). According to the present embodiment, even in such a case, the rod connecting portion 71 can be prevented from moving to the right side (−Y side) by being caught in the recess 71a. Therefore, the rod connecting portion 71 and the rod 72 can be stably maintained at the parking position P1.

On the other hand, when the manual shaft 81 is rotated by the electric actuator 80 and the rod connecting portion 71 moves from the parking position P1 to the non-parking position P2, the leaf spring main body portion 76a is pushed downward by the rod connecting portion 71. Elastically deforms. As a result, the protruding portion 76b comes off from the recess 71a. Here, when the leaf spring main body 76a is elastically deformed, the reaction force due to the elastic force is applied to the arm portion 75c to which the leaf spring main body 76a is fixed. In the present embodiment, the leaf spring member 76 is fixed to the upper surface of the arm portion 75c. Then, the reaction force due to the elastic force of the leaf spring main body portion 76a is applied downward with respect to the upper surface of the arm portion 75c.
That is, the reaction force due to the elastic force of the leaf spring main body portion 76a is applied in the direction in which the positioning portion 75d provided on the lower surface of the arm portion 75c is pressed against the positioning surface 12h. As a result, even if the leaf spring member 76 is elastically deformed, it is possible to prevent the screw 90 from loosening and to prevent the positioning portion 75d from separating from the positioning surface 12h.

When the movable member 70a is located at the non-parking position P2, the protruding portion 76b is inserted into the recess 71b and hooked in the left-right direction Y with respect to the inner surface of the recess 71b. As a result, the rod connecting portion 71 and the rod 72 can be maintained at the non-parking position P2.

The detent portion 76c projects downward from the front side (+ X side) edge portion at the left side (+ Y side) end portion of the leaf spring main body portion 76a. The detent portion 76c is located on the front side of the tip portion of the arm portion 75c. The detent portion 76c is hooked on the protrusion 75e from the left side. As a result, when the leaf spring member 76 is fixed with the screw 91, it is possible to prevent the leaf spring member 76 from rotating together. Therefore, it is possible to prevent the leaf spring member 76 from being displaced.

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 switching control of the parking switching mechanism 70 is performed for the first time. In the present embodiment, the rotation angle φ of the shift motor 82 sets the rotation position of the shift motor 82 to zero when the movable member 70a is located at the non-parking position P2.

The control unit 84 moves the movable member 70a to the left from the non-parking position P2 shown in FIG. 7 to the position shown in FIG. 10, and abuts the left end of the movable member 70a against the inner wall surface 10a of the housing 10. The control unit 84 rotates the shift motor 82 when the park lock arm 77 and the park lock gear 53 are moved from the non-parking position P2 where the engagement is disengaged until the left end of the movable member 70a abuts on the inner wall surface 10a. The first rotation angle φ1 which is an angle φ is detected by the encoder 83. As shown in FIG. 10, at a position where the left end of the movable member 70a contacts the inner wall surface 10a of the housing 10, the park lock arm 77 is supported by the first portion 73a from below, and the park lock gear 53 is supported. Engage in.

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

Information necessary for positioning the movable member 70a at the non-parking position P2 is stored in, for example, in advance in the control unit 84. As a result, the control unit 84 can control the shift motor 82 to position the movable member 70a at the non-parking position P2. The information required to position the movable member 70a at the non-parking position P2 includes, for example, the rotation position of the shift motor 82 at which the rotation angle φ of the shift motor 82 becomes zero. When the drive device 1 is assembled, the parking switching mechanism 70 may be assembled, for example, with the movable member 70a located at the non-parking position P2.

The control unit 84 calculates the second rotation angle φ2, which is smaller than the first rotation angle φ1, based on the detected first rotation angle φ1. Specifically, the control unit 84 calculates the second rotation angle φ2 from the predetermined error value and the safety factor stored in the control unit 84. The predetermined error value is the rotation angle of the shift motor 82 when the movable member 70a is moved in the left-right direction Y by the same amount as the maximum deviation amount of the relative positions of the estimated movable member 70a and the inner wall surface 10a in the left-right direction Y. The amount. The predetermined error value is determined based on the assembly tolerance of the drive device 1, the dimensional tolerance of each part of the drive device 1, the positioning tolerance of the movable member 70a by the electric actuator 80, and the like. The second rotation angle φ2 is a value obtained by multiplying a predetermined error value by a safety factor and subtracting the value from the first rotation angle φ1.

As shown in FIG. 7, in the present embodiment, the amount of movement L3 of the movable member 70a in the left-right direction Y when the shift motor 82 is rotated by the difference between the first rotation angle φ1 and the second rotation angle φ2 is the second. It is smaller than the dimension L1 of the one portion 73a in the left-right direction Y. The difference between the first rotation angle φ1 and the second rotation angle φ2 is a value obtained by multiplying a predetermined error value by a safety factor. The movement amount L3 is the distance Y in the left-right direction between the left end of the movable member 70a and the inner wall surface 10a at the parking position P1.

The control unit 84 rotates the shift motor 82 with the second rotation angle φ2 as a target value to move the movable member 70a from the non-parking position P2 to the parking position P1 where the park lock arm 77 meshes with the park lock gear 53. Can be done.

In the present embodiment, the control unit 84 rotates the shift motor 82 up to the second rotation angle φ2 by two-step control. As shown in FIG. 12, the period for rotating the shift motor 82 from zero to the second rotation angle φ2 includes a first control period CP1 and a second control period CP2. In FIG. 12, the vertical axis is the rotation angle φ, and the horizontal axis is the time t. In FIG. 12, the time t is set to zero at the start time when the movable member 70a starts to move from the non-parking position P2 to the parking position P1.

In the first control period CP1, the control unit 84 rotates the shift motor 82 by open loop control with a third rotation angle φ3 smaller than the second rotation angle φ2 as a target value. In the present embodiment, the third rotation angle φ3 is the rotation angle φ of the shift motor 82 when the position of the left end portion of the movable member 70a is the position P3 shown in FIG. As shown in FIG. 8, at position P3, the park lock arm 77 is supported from below by the right end of the tubular member 72d. In the present embodiment, the amount of movement L4 of the movable member 70a in the left-right direction Y when the shift motor 82 is rotated by the difference between the second rotation angle φ2 and the third rotation angle φ3 is the left-right direction Y of the second portion 73b. The size is L2 or more. As shown in FIG. 7, the movement amount L4 is the distance in the left-right direction Y between the position P3 and the parking position P1 at the left end of the movable member 70a. In the present embodiment, the movement amount L4 is larger than the dimension L2 of the second portion 73b in the left-right direction Y.

As shown in FIG. 12, the rotation angle φ changes linearly, for example, in the first control period CP1. When the control unit 84 detects that the rotation angle φ has become the third rotation angle φ3 by the encoder 83, the control unit 84 switches the control and shifts the control period from the first control period CP1 to the second control period CP2.

In the second control period CP2, the control unit 84 rotates the shift motor 82 by feedback control with the second rotation angle φ2 as the target value. In the present embodiment, the control unit 84 feedback-controls the shift motor 82 using the measured values of the encoder 83. The feedback gain in the feedback control of the second control period CP2 is relatively small. In the second control period CP2, the rotation angle φ changes smoothly and curvedly without causing an overshoot with respect to the second rotation angle φ2, for example. When the encoder 83 detects that the rotation angle φ has become the second rotation angle φ2, the control unit 84 stops the rotation of the shift motor 82. As a result, the control unit 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 third rotation angle φ3 as the target value, and then the feedback control with the second rotation angle φ2 as the target value. By rotating the shift motor 82, the movable member 70a is moved from the non-parking position P2 to the parking position P1.

If the control for calculating the second rotation angle φ2 by abutting the movable member 70a on the inner wall surface 10a is performed at least once before switching the parking switching mechanism 70 for the first time, the timing of the control is particularly limited. Not done. The control for calculating the second rotation angle φ2 may be performed periodically.

For example, consider a case where 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 unit 84 in advance. In this case, if the predetermined value is too small, the movable member 70a may not sufficiently move to the left due to a deviation due to an assembly tolerance or the like. In this case, for example, the park lock arm 77 may be in a state of being supported from below by the second portion 73b of the support portion 73, and the park lock arm 77 may not mesh with the park 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 the parking switching mechanism 70 may be damaged.

On the other hand, according to the present embodiment, as described above, the shift required for moving the movable member 70a to the parking position P1 by abutting the movable member 70a against the inner wall surface 10a by the control unit 84. A second rotation angle φ2, which is the rotation angle φ of the motor 82, can be obtained. Therefore, the value of the second rotation angle φ2 is set within a range in which the movable member 70a can be suitably suppressed from colliding with the inner wall surface 10a even when the position of the movable member 70a is displaced, and the movable member 70a is set. The value can be set as close as possible to the inner wall surface 10a. As a result, it is possible to prevent the movable member 70a from being insufficiently moved to the left side, and the park lock arm 77 can be supported from below by the first portion 73a of the support portion 73 at the parking position P1. Therefore, it is possible to prevent the park lock arm 77 from engaging with the park lock gear 53 when the parking switching mechanism 70 is switched to the locked state. In addition, it is possible to prevent the movable member 70a from moving too far to the left and colliding with the inner wall surface 10a. As described above, according to the present embodiment, in the drive device 1, it is possible to suppress damage to the parking switching mechanism 70 and to prevent the rotation of the axle from being locked.

Further, according to the present embodiment, the movement amount L3 of the movable member 70a in the left-right direction Y when the shift motor 82 is rotated by the difference between the first rotation angle φ1 and the second rotation angle φ2 is the first portion 73a. It is smaller than the dimension L1 in the left-right direction Y of. Here, the position of the movable member 70a when the shift motor 82 is rotated by the first rotation angle φ1 is such that the left end portion of the movable member 70a comes into contact with the inner wall surface 10a, and the park lock arm 77 is the first portion 73a. It is a position that is supported from below. Therefore, if the movement amount is smaller than the dimension L1 of the first portion 73a, even if the shift motor 82 is moved to the right from the position of the movable member 70a when the shift motor 82 is rotated by the first rotation angle φ1, the park lock arm 77 Is easy to maintain in a state of being supported from below by the first portion 73a. Therefore, when the shift motor 82 is rotated by the second rotation angle φ2 by determining the second rotation angle φ2 within the range where the movement amount L3 is smaller than the dimension L1 in the left-right direction Y of the first portion 73a. , The park lock arm 77 is more likely to be supported from below by the first portion 73a. Therefore, it is possible to further prevent the park lock arm 77 from engaging with the park lock gear 53 when the parking switching mechanism 70 is switched to the locked state. Therefore, it is possible to further suppress the inability to lock the rotation of the axle of the vehicle.

Further, according to the present embodiment, the control unit 84 rotates the shift motor 82 by open loop control with a third rotation angle φ3 smaller than the second rotation angle φ2 as a target value, and then the second rotation angle φ2. By rotating the shift motor 82 by feedback control with the target value set to, the movable member 70a is moved from the non-parking position P2 to the parking position P1. Therefore, until the rotation angle φ of the shift motor 82 becomes the third rotation angle φ3, the movable member 70a can be moved faster by the open loop control than in the case of performing feedback control. On the other hand, when the rotation angle φ becomes larger than the third rotation angle φ3, the movable member 70a can be moved with high position accuracy by feedback control. As a result, the movable member 70a can be moved to the parking position P1 with high position accuracy while shortening the time for switching the parking switching mechanism 70 from the unlocked state to the locked state.

Further, according to the present embodiment, the movement amount L4 of the movable member 70a in the left-right direction Y when the shift motor 82 is rotated by the difference between the second rotation angle φ2 and the third rotation angle φ3 is the second portion 73b. The dimension L2 or more in the left-right direction Y of. Therefore, the third rotation angle φ3 can be made relatively small, and the timing of switching from the first control period CP1 to the second control period CP2 can be made relatively early. That is, the timing of switching to feedback control can be made relatively early. As a result, the length of the second control period CP2 in which the feedback control is performed can be made relatively long, and the rotation angle φ can be changed more smoothly within the second control period CP2. Therefore, when the open loop control is switched to the feedback control, it is possible to suppress a sudden change in the rotation speed of the shift motor 82, and it is possible to suppress an impact due to a sudden change in the rotation speed of the shift motor 82.

The present invention is not limited to the above-described embodiment, and other configurations may be adopted. The control unit 84 may control the shift motor 82 as shown in FIG. In the first control period CP1a of FIG. 13, the control unit 84 rotates the shift motor 82 by feedback control with the third rotation angle φ3 as a target value. When the value of the rotation angle φ is within the range of ± Δφ with respect to the third rotation angle φ3, the control unit 84 switches the control and changes the control period from the first control period CP1a to the second control period CP2. Migrate. That is, in the control method of FIG. 13, the control unit 84 rotates the shift motor 82 by the feedback control with the third rotation angle φ3 as the target value, and then the shift motor by the feedback control with the second rotation angle φ2 as the target value. By rotating the 82, the movable member 70a is moved from the non-parking position P2 to the parking position P1. According to 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 used as feedback control. Therefore, the movable member 70a can be moved with higher position accuracy.

The feedback gain of the feedback control in the first control period CP1a is larger than the feedback gain of the feedback control in the second control period CP2. That is, the feedback gain in the feedback control with the third rotation angle φ3 as the target value is larger than the feedback gain in the feedback control with the second rotation angle φ2 as the target value. Therefore, the length of the first control period CP1a can be made relatively short. As a result, the time required to switch the parking switching mechanism 70 from the unlocked state to the locked state can be shortened while the movable member 70a is moved with high position accuracy by feedback control.

The third rotation angle φ3 may be stored in advance in the control unit 84 without being controlled to abut the movable member 70a against the inner wall surface 10a. The control unit 84 controls the movable member 70a from the non-parking position P2 to the parking position by performing the control with the second rotation angle φ2 as the target value from the beginning without performing the control with the third rotation angle φ3 as the target value. It may be moved to P1. When switching the parking switching mechanism 70, the control unit 84 may rotate the shift motor 82 only by open loop control without performing feedback control.

The control unit 84 may calculate the rotation position of the shift motor 82 in which the movable member 70a is the non-parking position P2, based on the rotation position of the shift motor 82 when the movable member 70a is abutted against the inner wall surface 10a. .. In this case, the control unit 84 sets the position where the movable member 70a is rotated in the reverse direction by a predetermined rotation angle from the rotation position of the shift motor 82 when the movable member 70a is abutted against the inner wall surface 10a as a position where the rotation angle φ becomes zero. The rotation angle φ1 and the second rotation angle φ2 are calculated. 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 a predetermined rotation angle is equal to or greater 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, it is possible to prevent the axle from being locked at the non-parking position P2.

The first direction and the second direction are not particularly limited as long as they are orthogonal to each other. The configurations described herein can be combined as appropriate to the extent that they do not contradict each other.

1 ... Drive device, 10 ... Housing, 10a ... Inner wall surface, 20 ... Motor, 52 ... Second gear (gear), 53 ... Park lock gear, 70 ... Parking switching mechanism, 70a ... Movable member, 73 ... Support part, 73a ... 1st part, 73b ... 2nd part, 77 ... Park lock arm, 77c ... End, 80 ... Electric actuator, 82 ... Shift motor, 83 ... Encoder, 84 ... Control unit, 100 ... Transmission mechanism, P1 ... Parking Position, P2 ... non-parking position, φ ... rotation angle, φ1 ... first rotation angle, φ2 ... second rotation angle, φ3 ... third rotation angle

Claims (6)

It is a drive device mounted on a vehicle.
With the motor
A transmission mechanism having a gear and transmitting torque output from the motor to the axle of the vehicle,
A park lock gear fixed to the gear and connected to the axle,
A movable member that moves along the first direction, and a movable member that moves in a second direction orthogonal to the first direction as the movable member moves in the first direction, and meshes with the park lock gear to cause the axle. A parking switching mechanism with a park lock arm that can lock the rotation,
A housing that houses the motor, the transmission mechanism, the park lock gear, and the parking switching mechanism.
A shift motor that moves the movable member in the first direction based on the shift operation of the vehicle, and an electric actuator having an encoder that detects the rotation angle of the shift motor.
A control unit that controls the electric actuator and
With
The movable member has a support portion that supports the park lock arm from one side in the second direction.
The support portion
The first part and
A second portion connected to one side of the first portion of the first portion and whose outer diameter becomes smaller toward one side of the first direction.
Have,
At a position where one end of the movable member in the first direction comes into contact with the inner wall surface of the housing, the park lock arm is supported by the first portion from one side in the second direction. Engage in the park lock gear,
The control unit
The shift motor when the movable member is moved from a non-parking position where the park lock arm and the park lock gear are disengaged until one end of the movable member in the first direction abuts on the inner wall surface of the housing. The first rotation angle, which is the rotation angle of, is detected by the encoder.
Based on the first rotation angle, a second rotation angle smaller than the first rotation angle is calculated.
A driving device that moves the movable member from the non-parking position to a parking position where the park lock arm meshes with the park lock gear by rotating the shift motor with the second rotation angle as a target value. The amount of movement of the movable member in the first direction when the shift motor is rotated by the difference between the first rotation angle and the second rotation angle is larger than the dimension of the first portion in the first direction. The driving device according to claim 1, which is small. The control unit rotates the shift motor by open loop control with a third rotation angle smaller than the second rotation angle as a target value, and then shifts by feedback control with the second rotation angle as a target value. The drive device according to claim 1 or 2, wherein the movable member is moved from the non-parking position to a parking position where the park lock arm meshes with the park lock gear by rotating a motor. The control unit rotates the shift motor by feedback control with a third rotation angle smaller than the second rotation angle as a target value, and then the shift motor by feedback control with the second rotation angle as a target value. The drive device according to claim 1 or 2, wherein the movable member is moved from the non-parking position to a parking position where the park lock arm meshes with the park lock gear by rotating. The drive device according to claim 4, wherein the feedback gain in the feedback control with the third rotation angle as the target value is larger than the feedback gain in the feedback control with the second rotation angle as the target value. When the shift motor is rotated by the difference between the second rotation angle and the third rotation angle, the amount of movement of the movable member in the first direction is equal to or greater than the dimension of the second portion in the first direction. The drive device according to any one of claims 3 to 5.

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