Parking mechanism and drive device

Abstract

To provide a parking mechanism having a structure capable of improving reliability, and a driving device.SOLUTION: In a parking mechanism 10 including: a movable portion rotating in accompany with rotation of a driven shaft; a ratchet member 40 having a claw portion 42 and moving in accompany with the rotation of the movable portion; a parking gear 50 with which the claw portion can be engaged; and a stopper portion 110 capable of being brought into contact with the movable portion, the movable portion has: a first elastic member mounted on the driven shaft; and a contact member 32 connected to the driven shaft through the first elastic member, and kept into contact with the ratchet member. The contact member is relatively rotatable in a rotating direction to the driven shaft by elastic deformation of the first elastic member, and can be brought into contact with the stopper portion in the rotating direction. The stopper portion is opposed to the contact member with a clearance in the rotating direction in switching a position of the ratchet member between a parking position and a non-parking position.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a parking mechanism and a drive device. [Background technology]

[0002] For example, Patent Document 1 describes a parking lock mechanism mounted on a vehicle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] China Utility Model No. 205001503 Specification Summary of the Invention [Problem to be solved by the invention]

[0004] In the parking lock mechanism, the vehicle may be parked by rotating the movable part to move the pawl member and meshing the claw of the pawl member with the parking gear. In this case, for example, if the claw comes into contact with the teeth of the parking gear and the pawl member is flipped up, the movable part may rotate too much and come off the pawl member. This may cause a malfunction in the operation of the parking lock mechanism.

[0005] In view of the above circumstances, an object of the present invention is to provide a parking mechanism having a structure capable of improving reliability, and a drive device including such a parking mechanism. [Means for solving the problem]

[0006] One aspect of the parking mechanism of the present invention includes a driven shaft rotatable about a central axis extending in a predetermined direction, a movable part that rotates with the rotation of the driven shaft, a pawl member having a claw portion and moving with the rotation of the movable part, a parking gear with which the claw portion can mesh, and a stopper portion that can contact the movable part in the rotation direction of the movable part. The position of the pawl member is switched between a parking position where the claw portion meshes with the parking gear and a non-parking position where the claw portion is separated from the parking gear with the rotation of the movable part. The movable part includes a first elastic member attached to the driven shaft, and a contact member that is connected to the driven shaft via the first elastic member and contacts the pawl member. The contact member is rotatable relative to the driven shaft in the rotation direction by the elastic deformation of the first elastic member, and is contactable with the stopper portion in the rotation direction. The stopper portion faces the contact member with a gap therebetween in the rotational direction when the position of the pawl member is switched between the parking position and the non-parking position.

[0007] One aspect of the drive unit of the present invention is a drive unit mounted on a vehicle, and comprises a power unit that drives the drive unit, a transmission mechanism unit connected to the power unit, the above-mentioned parking mechanism attached to the transmission mechanism unit, and a housing that accommodates the power unit, the transmission mechanism unit, and the parking mechanism. Effect of the Invention

[0008] According to one aspect of the present invention, the reliability of the parking mechanism can be improved.

[0009] According to one aspect of the present invention, the reliability of the parking mechanism in a drive device can be improved. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a cross-sectional view that illustrates a schematic diagram of a drive device according to the present embodiment. [Diagram 2] FIG. 2 is a cross-sectional view showing a part of the drive device of the present embodiment. [Diagram 3] FIG. 3 is a perspective view showing the parking mechanism of the present embodiment. [Figure 4] FIG. 4 is an exploded perspective view showing a part of the parking mechanism of the present embodiment. [Diagram 5] FIG. 5 is a perspective view showing a fixed member of the present embodiment. [Figure 6] FIG. 6 is a view of the parking mechanism of this embodiment as seen from the right side. [Figure 7] FIG. 7 is a right side view of the parking mechanism according to the present embodiment, showing a state in which the contact member is in contact with the stopper portion. [Figure 8] FIG. 8 is a right side view of the parking mechanism according to the present embodiment, showing a state in which the fixed member is abutted against the abutment portion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Each figure shows an X-axis, a Y-axis perpendicular to the X-axis, and a Z-axis perpendicular to the X-axis and Y-axis. In the following description, the direction parallel to the Z-axis is called the "up-down direction", the direction parallel to the Y-axis is called the "left-right direction", and the direction parallel to the X-axis is called the "front-rear direction". The up-down direction, left-right direction, and front-rear direction are perpendicular to each other. The up-down direction is, for example, the up-down direction in a vehicle in which the drive unit 100 shown in FIG. 1 is mounted. The left-right direction is, for example, the left-right direction in a vehicle in which the drive unit 100 is mounted. The front-rear direction is, for example, the front-rear direction in a vehicle in which the drive unit 100 is mounted.

[0012] In the up-down direction, the positive side of the Z-axis arrow is called the top side, and the opposite side of the Z-axis arrow is called the bottom side. In the left-right direction, the positive side of the Y-axis arrow is called the left side, and the opposite side of the Y-axis arrow is called the right side. In the front-to-back direction, the positive side of the X-axis arrow is called the front side, and the negative side of the X-axis arrow is called the back side.

[0013] In the following embodiments, the left-right direction corresponds to a “predetermined direction.” Note that the up-down direction, left-right direction, front-rear direction, upper side, lower side, left side, right side, front side, and rear side are names simply for describing the layout relationships of the various parts, and the actual layout relationships may be other than those indicated by these names.

[0014] 1 is a drive device 100 mounted on a vehicle to rotate an axle 86. As shown in FIG. 1, the drive device 100 includes a power unit 80a, a transmission mechanism unit 80b, a parking mechanism 10, a housing 85, and an electric actuator 90.

[0015] The housing 85 accommodates the power unit 80a, the transmission mechanism unit 80b, and the parking mechanism 10 therein. The housing 85 has a first housing 85a accommodating the power unit 80a, and a second housing 85b accommodating the transmission mechanism unit 80b and the parking mechanism 10. The second housing 85b is connected, for example, to the left side of the first housing 85a. For example, oil O is stored inside the first housing 85a and the second housing 85b.

[0016] 2, the second housing 85b has a first member 87 and a second member 88. The first member 87 and the second member 88 are separate members. The second member 88 is fixed to the first member 87. In this embodiment, the second housing 85b is configured by fixing the first member 87 and the second member 88. The second member 88 is located, for example, on the left side of the first member 87.

[0017] The first member 87 has a partition wall 87a. That is, the housing 85 has the partition wall 87a. The partition wall 87a is a wall portion that divides the interior of the first housing 85a and the interior of the second housing 85b in the left-right direction. The partition wall 87a is located, for example, on the right side of the parking mechanism 10. The left surface of the partition wall 87a forms at least a part of the surface located on the right side of the inner surface of the second housing 85b.

[0018] The first member 87 has a first hole 87b. That is, the housing 85 has the first hole 87b. The first hole 87b is, for example, a hole recessed from the left surface of the partition wall 87a to the right and having a bottom on the right side. Although not shown, the first hole 87b has, for example, a circular shape centered on the central axis J4 when viewed in the left-right direction. In this embodiment, the central axis J4 extends in the left-right direction. The central axis J4 is, for example, parallel to the power shaft J1.

[0019] The second member 88 is, for example, a box-shaped member that opens to the right side. The right opening of the second member 88 is blocked by, for example, a partition wall 87a. The second member 88 has a left side wall portion 88a and a connecting tube portion 88b. The left side wall portion 88a is located, for example, on the left side of a portion of the parking mechanism 10 that is located inside the second housing 85b. The left side wall portion 88a has a recessed portion 88c that is recessed to the left from the right side surface of the left side wall portion 88a. Although not shown in the drawings, the recessed portion 88c is, for example, circular in shape centered on the central axis J4 when viewed in the left-right direction.

[0020] The connecting cylinder portion 88b protrudes to the left side from the left side wall portion 88a. The connecting cylinder portion 88b opens to the left side. The connecting cylinder portion 88b is, for example, cylindrical and centered on the central axis J4. An oil seal 71 is held inside the connecting cylinder portion 88b. The oil seal 71 is annular and surrounds the driven shaft 20, which will be described later.

[0021] The second member 88 has a second hole 88d. That is, the housing 85 has a second hole 88d. The second hole 88d is recessed, for example, from the right surface of the left side wall 88a to the left. More specifically, the second hole 88d is recessed, for example, from the bottom surface of the recess 88c to the left. The bottom surface of the recess 88c is a surface located on the left side of the inner surface of the recess 88c and facing the right side. Although not shown, the second hole 88d has a circular shape centered on the central axis J4 when viewed in the left-right direction. The second hole 88d penetrates, for example, the left side wall 88a in the left-right direction and connects the inside of the second housing 85b and the inside of the connecting tube 88b. The inner diameter of the second hole 88d is smaller than, for example, the inner diameter of the first hole 87b, the inner diameter of the recess 88c, and the inner diameter of the connecting tube 88b.

[0022] In this embodiment, the electric actuator 90 is a drive source that drives the parking mechanism 10. As shown in Fig. 1, the electric actuator 90 is located, for example, outside the housing 85. The electric actuator 90 is fixed, for example, to the outer surface of the second housing 85b. The electric actuator 90 is connected, for example, to the connecting cylinder portion 88b.

[0023] The power unit 80a is a part that drives the drive device 100. In this embodiment, the power unit 80a is a motor. The power unit 80a has a rotor 81 and a stator 82. The rotor 81 has a power shaft 81a that can rotate around a power axis J1. The power axis J1 extends, for example, in the left-right direction. The power shaft 81a is, for example, cylindrical and extends in the left-right direction around the power axis J1. The power shaft 81a extends, for example, from inside the first housing 85a to the left, penetrates the partition wall 87a in the left-right direction, and protrudes into the inside of the second housing 85b.

[0024] The transmission mechanism 80b is connected to the power unit 80a. The transmission mechanism 80b has a reduction gear 83 and a differential gear 84. The reduction gear 83 is connected to the power shaft 81a. The reduction gear 83 reduces the rotation speed of the power unit 80a and increases the torque output from the power unit 80a according to the reduction ratio. The reduction gear 83 transmits the torque output from the power unit 80a to the differential gear 84. The reduction gear 83 has a first gear 83a, a second gear 83b, a third gear 83c, and an intermediate shaft 83d. That is, the transmission mechanism 80b has a first gear 83a and a second gear 83b.

[0025] The first gear 83a is fixed to the outer circumferential surface of the portion of the power shaft 81a that protrudes into the second housing 85b. As a result, the first gear 83a is fixed to the power unit 80a. The intermediate shaft 83d extends in the left-right direction, for example, about the intermediate shaft J2. The intermediate shaft J2 is parallel to the power shaft J1, for example. The intermediate shaft J2 is located, for example, below the power shaft J1. The second gear 83b and the third gear 83c are fixed to the outer circumferential surface of the intermediate shaft 83d. The second gear 83b and the third gear 83c are connected via the intermediate shaft 83d. The second gear 83b meshes with the first gear 83a. The intermediate shaft 83d, the second gear 83b, and the third gear 83c are rotatable about the intermediate shaft J2.

[0026] The differential gear 84 is connected to the reduction gear 83. The differential gear 84 rotates the axle 86. The axle 86 rotates around the output shaft J3 extending parallel to the power shaft J1, for example. The output shaft J3 is disposed at a position offset from the power shaft J1 and the intermediate shaft J2, for example, when viewed in the left-right direction. The differential gear 84 has a ring gear 84a. The ring gear 84a meshes with the third gear 83c. The torque output from the power unit 80a is transmitted to the ring gear 84a via the reduction gear 83. The lower end of the ring gear 84a is immersed in the oil O stored in the second housing 85b. The oil O is scooped up by the rotation of the ring gear 84a. The scooped up oil O is supplied to the reduction gear 83 and the differential gear 84, for example, as lubricating oil.

[0027] In this embodiment, the parking mechanism 10 is driven by an electric actuator 90 based on a shift operation of the vehicle. The state of the parking mechanism 10 is switched between a locked state in which the rotation of the axle 86 is prevented and an unlocked state in which the rotation of the axle 86 is permitted by the electric actuator 90, which is a power source. The parking mechanism 10 is in a locked state when the gear of the vehicle is in parking, and is in an unlocked state when the gear of the vehicle is in a gear other than parking. The gear of the vehicle other than parking includes, for example, the gear of the vehicle is in drive, neutral, reverse, etc. As shown in FIG. 3, the parking mechanism 10 includes a driven shaft 20, a movable part 30, a pawl member 40, a parking gear 50, and a second elastic member 60.

[0028] The driven shaft 20 can rotate around a central axis J4 extending in the left-right direction. The driven shaft 20 is, for example, cylindrical and extending in the left-right direction around the central axis J4. In the following description of the parking mechanism 10, the radial direction around the central axis J4 may be simply referred to as the "radial direction", and the circumferential direction around the central axis J4 may be simply referred to as the "circumferential direction". In each drawing, the circumferential direction is indicated by an arrow θ as appropriate. The side of the circumferential direction that moves clockwise around the central axis J4 as viewed from the right side, i.e., the side to which the arrow θ points (+θ side), is referred to as the "one circumferential side", and the side of the circumferential direction that moves counterclockwise around the central axis J4 as viewed from the right side, i.e., the opposite side to the side to which the arrow θ points (-θ side), is referred to as the "other circumferential side".

[0029] As shown in Fig. 2, the driven shaft 20 protrudes from, for example, the inside of the second housing 85b through the inside of the recess 88c, the inside of the second hole 88d, and the inside of the connecting tube portion 88b to the outside of the housing 85. As shown in Fig. 2 and Fig. 4, the driven shaft 20 has a connected portion 21, a large diameter portion 22, a medium diameter portion 23, and a small diameter portion 24. The connected portion 21, the large diameter portion 22, the medium diameter portion 23, and the small diameter portion 24 are connected in this order from the left side to the right side.

[0030] The connected part 21 is a portion that is connected to the electric actuator 90. As shown in FIG. 2, the connected part 21 protrudes, for example, to the outside of the housing 85. The left end of the connected part 21 is, for example, the left end of the driven shaft 20. For example, a spline part is provided on the outer circumferential surface of the connected part 21. The connected part 21 is connected to the electric actuator 90 by, for example, fitting the spline part into a spline groove provided in the output part of the electric actuator 90.

[0031] In this embodiment, the connected part 21 is a part of the driven shaft 20 located to the left of the movable part 30. That is, in this embodiment, the connected part 21, which is a part of the driven shaft 20 located to the left of the movable part 30, is connected to the electric actuator 90, which is a drive source that rotates the driven shaft 20.

[0032] The large diameter portion 22 is connected to the right side of the connected portion 21. The outer diameter of the large diameter portion 22 is, for example, larger than the outer diameter of the connected portion 21. The left-right dimension of the large diameter portion 22 is, for example, larger than the left-right dimension of the connected portion 21. The large diameter portion 22 has a sealed portion 22a and a second supported portion 22b. In other words, the driven shaft 20 has the sealed portion 22a and the second supported portion 22b.

[0033] The sealed portion 22a is, for example, the left portion of the large diameter portion 22. The sealed portion 22a is located, for example, inside the connecting cylindrical portion 88b. The outer peripheral surface of the sealed portion 22a contacts the inner peripheral surface of the oil seal 71. The oil seal 71 provides a seal between the outer peripheral surface of the sealed portion 22a and the inner peripheral surface of the connecting cylindrical portion 88b.

[0034] The second supported portion 22b is, for example, the right portion of the large diameter portion 22. The second supported portion 22b is connected to the right side of the sealed portion 22a. The second supported portion 22b is inserted into the second hole portion 88d. The outer diameter of the second supported portion 22b is slightly smaller than the inner diameter of the second hole portion 88d. In this embodiment, the second supported portion 22b is gap-fitted into the second hole portion 88d. As a result, the second supported portion 22b is supported by the inner circumferential surface of the second hole portion 88d so as to be rotatable around the central axis J4. That is, in this embodiment, the second hole portion 88d functions as a bearing portion that supports the second supported portion 22b so as to be rotatable around the central axis J4. The second supported portion 22b is located between the connected portion 21, which is a portion of the driven shaft 20 that is connected to the electric actuator 90 as a drive source, and the movable portion 30 in the left-right direction.

[0035] The medium diameter portion 23 is connected to the right side of the large diameter portion 22. The outer diameter of the medium diameter portion 23 is, for example, smaller than the outer diameter of the large diameter portion 22. The left-right dimension of the medium diameter portion 23 is, for example, larger than the left-right dimension of the large diameter portion 22. The medium diameter portion 23 is, for example, located inside the second housing 85b. The left end of the medium diameter portion 23 is, for example, located inside the recess 88c. The medium diameter portion 23 has a pin hole 23a that penetrates the medium diameter portion 23 in the radial direction. The pin hole 23a is, for example, provided in a portion of the medium diameter portion 23 closer to the left side. As shown in FIG. 4, the pin hole 23a is, for example, a circular hole.

[0036] The small diameter portion 24 is connected to the right side of the medium diameter portion 23. The outer diameter of the small diameter portion 24 is smaller than, for example, the outer diameter of the medium diameter portion 23 and the outer diameter of the connected portion 21. As shown in FIG. 2, the small diameter portion 24 has a first supported portion 24a. In other words, the driven shaft 20 has the first supported portion 24a. The first supported portion 24a is, for example, the right portion of the small diameter portion 24. The right end portion of the first supported portion 24a is, for example, the right end portion of the driven shaft 20. The first supported portion 24a is located to the right of the movable portion 30.

[0037] The first supported portion 24a is inserted into the first hole portion 87b. The outer diameter of the first supported portion 24a is slightly smaller than the inner diameter of the first hole portion 87b. In this embodiment, the first supported portion 24a is clearance-fitted into the first hole portion 87b. As a result, the first supported portion 24a is supported by the inner circumferential surface of the first hole portion 87b so as to be rotatable around the central axis J4. In other words, in this embodiment, the first hole portion 87b functions as a bearing portion that supports the first supported portion 24a so as to be rotatable around the central axis J4.

[0038] The movable part 30 is a part that rotates in association with the rotation of the driven shaft 20. In this embodiment, the movable part 30 rotates in a circumferential direction about the central axis J4 in association with the rotation of the driven shaft 20. That is, in this embodiment, the circumferential direction about the central axis J4 corresponds to the rotation direction of the movable part 30. As shown in FIG. 4, the movable part 30 has a fixed member 31, a contact member 32, and a first elastic member 33.

[0039] The fixed member 31 is fixed to the driven shaft 20. The fixed member 31 has a tubular portion 34 and a flange portion 35. The tubular portion 34 and the flange portion 35 are, for example, separate members and fixed to each other. The tubular portion 34 is, for example, substantially cylindrical with the central axis J4 as the center. The tubular portion 34 is open on both the left and right sides. As shown in FIG. 2, the medium diameter portion 23 of the driven shaft 20 passes through the inside of the tubular portion 34 in the left and right direction. The tubular portion 34 has a first portion 34a and a second portion 34b.

[0040] The first portion 34a is, for example, the left portion of the tubular portion 34. The second portion 34b is, for example, the right portion of the tubular portion 34. The second portion 34b is connected to the right side of the first portion 34a. The outer diameter of the second portion 34b is smaller than the outer diameter of the first portion 34a. A step having a step surface 34e is provided between the first portion 34a and the second portion 34b in the left-right direction. The step surface 34e is, for example, a surface facing to the right and perpendicular to the left-right direction, and is the right end surface of the first portion 34a.

[0041] The first portion 34a has a pin hole 34c. A pair of the pin holes 34c are provided on either side of the central axis J4 in the radial direction. The pin hole 34c penetrates the first portion 34a from the inner peripheral surface to the outer peripheral surface. The pin hole 34c is, for example, a circular hole. The first portion 34a is fixed to the medium diameter portion 23 by, for example, a pin 38 passed through the pin hole 34c. In this way, the cylindrical portion 34 is fixed to the driven shaft 20, and the fixed member 31 is fixed to the driven shaft 20.

[0042] The pin 38 is cylindrical and extends in the radial direction about the central axis J4. The pin 38 extends from one of the pair of pin holes 34c of the cylindrical portion 34 through the pin hole 23a of the driven shaft 20 to the other of the pair of pin holes 34c. The pin 38 is fitted into each of the pin holes 23a, 34c and fixed. By fitting the pin 38 into each of the pin holes 23a, 34c, the relative rotation around the central axis J4 and the relative movement in the left-right direction between the driven shaft 20 and the fixed member 31 are prevented. As shown in FIG. 4, a pair of flat surfaces 34d is provided on the outer circumferential surface of the first portion 34a. The pair of flat surfaces 34d are rectangular surfaces perpendicular to the radial direction and are arranged on opposite sides of the central axis J4.

[0043] As shown in FIG. 2, a washer 70 is provided between the left end of the tubular portion 34 and the bottom surface of the recess 88c. The washer 70 is, for example, annular about the central axis J4 and surrounding the medium diameter portion 23 of the driven shaft 20. The washer 70 is plate-like with the plate surface facing in the left-right direction. The inner diameter of the washer 70 is, for example, smaller than the outer diameter of the large diameter portion 22. The left surface of the washer 70 is in contact with, for example, the bottom surface of the recess 88c. The right surface of the washer 70 is in contact with, for example, the left end face of the tubular portion 34.

[0044] The flange portion 35 is fixed to the tube portion 34. The flange portion 35 is formed, for example, by bending a plate-shaped member. The flange portion 35 has a base portion 35a, a connecting portion 35b, and an outer edge portion 35c. In other words, the fixed member 31 has the outer edge portion 35c.

[0045] The base 35a is a portion fixed to the tube portion 34. The base 35a has a fixing hole 35g penetrating the base 35a in the left-right direction. The second portion 34b is fitted into the fixing hole 35g. The right end of the second portion 34b protrudes rightward beyond the fixing hole 35g. The outer diameter of the portion of the second portion 34b protruding rightward beyond the fixing hole 35g becomes smaller, for example, toward the right.

[0046] The left surface of the base 35a is in contact with the step surface 34e. The base 35a is fixed to the tubular portion 34 by, for example, welding. The base 35a may be fixed to the tubular portion 34 by press-fitting the second portion 34b into the fixing hole 35g. As shown in FIG. 5, the base 35a has an insertion hole 35f recessed to the left from the right surface of the base 35a. The insertion hole 35f is, for example, a circular hole penetrating the base 35a in the left-right direction.

[0047] The connecting portion 35b is a portion that connects the base portion 35a and the outer edge portion 35c. The connecting portion 35b protrudes from a part of the circumferential direction of the base portion 35a diagonally to the right and outward in the radial direction. For example, the connecting portion 35b protrudes from a portion of the base portion 35a that is located at a circumferential position different from the circumferential position of the insertion hole 35f.

[0048] The outer edge portion 35c protrudes radially outward from the radially outer end of the connecting portion 35b. The outer edge portion 35c is located outside the tube portion 34 in the radial direction centered on the central axis J4. The outer edge portion 35c extends, for example, in the circumferential direction. The circumferential dimension of the outer edge portion 35c increases, for example, from the radially inner side toward the radially outer side. As shown in FIG. 2, in this embodiment, the outer edge portion 35c is located to the right of the tube portion 34. That is, in this embodiment, the left-right position of the tube portion 34 and the left-right position of the outer edge portion 35c are different from each other. Also, in this embodiment, the left-right position of the tube portion 34 is a position farther left-right from the contact member 32 than the left-right position of the outer edge portion 35c.

[0049] As shown in Fig. 6, in this embodiment, the side surface on one circumferential side (+θ side) of the outer edge portion 35c is a flat third opposing surface 35i facing one circumferential side. In other words, the fixed member 31 has a flat third opposing surface 35i facing the circumferential direction (rotation direction). The third opposing surface 35i extends, for example, in a direction inclined toward the circumferential direction with respect to the radial direction. The third opposing surface 35i is located toward the other circumferential side (-θ side) as it moves toward the radial outside. The third opposing surface 35i is a circumferential side surface of the fixed member 31.

[0050] As shown in FIG. 5, the fixed member 31 has a groove 35h. In this embodiment, the groove 35h is provided in the outer edge portion 35c. The groove 35h is recessed radially inward from the radial outer periphery of the outer edge portion 35c. In this embodiment, a plurality of grooves 35h are provided. The groove 35h includes a first groove portion 35d and a second groove portion 35e. The first groove portion 35d and the second groove portion 35e are spaced apart from each other in the circumferential direction. The second groove portion 35e is disposed, for example, spaced apart from the first groove portion 35d on one side in the circumferential direction. The first groove portion 35d is provided, for example, at an end portion on the other circumferential side of the outer edge portion 35c. The second groove portion 35e is provided, for example, at an end portion on one circumferential side of the outer edge portion 35c.

[0051] As shown in FIG. 2, the contact member 32 is connected to the fixed member 31 via the first elastic member 33. As a result, the contact member 32 is connected to the driven shaft 20 via the first elastic member 33 and the fixed member 31. The contact member 32 is rotatable relative to the driven shaft 20 and the fixed member 31 in the circumferential direction (rotation direction) about the central axis J4 as the first elastic member 33 is elastically deformed. The contact member 32 is located, for example, on the right side of the fixed member 31 and away from it. That is, in this embodiment, the fixed member 31 and the contact member 32 are arranged with a gap between them in the left-right direction. The contact member 32 protrudes radially outward from the driven shaft 20. The contact member 32 is, for example, a single member. The contact member 32 has a cylindrical portion 36 and a cam flange portion 37.

[0052] The tubular portion 36 is, for example, cylindrical with the central axis J4 as the center. The tubular portion 36 is open on both sides in the left-right direction. The tubular portion 36 has a through hole 36e through which the driven shaft 20 passes in the left-right direction. That is, the contact member 32 has a through hole 36e through which the driven shaft 20 passes in the left-right direction. Inside the through hole 36e, the right end of the medium diameter portion 23 and the left part of the small diameter portion 24 are located. A step having a step surface 36d is provided on the inner peripheral surface of the through hole 36e. The step surface 36d is a surface facing the left side. For example, the step surface of a step provided between the medium diameter portion 23 and the small diameter portion 24 in the left-right direction contacts the step surface 36d.

[0053] The tube portion 36 has a base portion 36a, a first protruding portion 36b connected to the right side of the base portion 36a, and a second protruding portion 36c connected to the left side of the base portion 36a. The first protruding portion 36b protrudes to the right side from the base portion 36a. The outer diameter of the first protruding portion 36b is smaller than the outer diameter of the base portion 36a. The right end face of the first protruding portion 36b is, for example, the right end face of the contact member 32, and contacts the left side face of the partition wall 87a. The second protruding portion 36c protrudes to the left side from the base portion 36a. The outer diameter of the second protruding portion 36c is smaller than the outer diameter of the base portion 36a. The outer diameter of the second protruding portion 36c, for example, becomes smaller toward the left side.

[0054] The cam flange portion 37 spreads outward in the radial direction from the base portion 36a. For example, the cam flange portion 37 spreads downward from the base portion 36a. As shown in FIG. 4, the cam flange portion 37 is substantially fan-shaped when viewed in the left-right direction. A part of the radial outer surface of the cam flange portion 37 is a cam surface 37a. That is, the contact member 32 has the cam surface 37a. The cam surface 37a extends in the circumferential direction. The cam surface 37a faces, for example, downward. As shown in FIG. 3 and FIG. 6, the cam surface 37a is a surface that contacts the pawl member 40. That is, in this embodiment, the contact member 32 contacts the pawl member 40 via the cam surface 37a. The cam surface 37a is, for example, located radially outward from the radial outer edge of the outer edge portion 35c.

[0055] As shown in FIG. 6, the cam surface 37a has a first cam portion 37b, a second cam portion 37c, and a connecting cam portion 37f. The first cam portion 37b and the second cam portion 37c extend in the circumferential direction. The first cam portion 37b and the second cam portion 37c are, for example, arc-shaped about the central axis J4. The first cam portion 37b and the second cam portion 37c are connected in the circumferential direction via the connecting cam portion 37f. The second cam portion 37c is, for example, connected to one side of the first cam portion 37b in the circumferential direction. The second cam portion 37c is located radially outward of the first cam portion 37b.

[0056] The connecting cam portion 37f is located between the first cam portion 37b and the second cam portion 37c in the circumferential direction. The connecting cam portion 37f circumferentially connects an end portion on one circumferential side (+θ side) of the first cam portion 37b and an end portion on the other circumferential side (-θ side) of the second cam portion 37c. The connecting cam portion 37f is an inclined surface that is inclined with respect to the circumferential direction. The radial position of the connecting cam portion 37f is located radially outward as it approaches the one circumferential side (+θ side).

[0057] In this embodiment, the cam surface 37a has a portion whose circumferential position is the same as that of the first groove portion 35d. That is, in this embodiment, the circumferential position of at least a portion of the groove portion 35h about the central axis J4 is included in the circumferential position of the cam surface 37a about the central axis J4. In this embodiment, the circumferential position of the cam surface 37a is in the circumferential range indicated by θc in FIG. 6. The circumferential position of the cam surface 37a includes, for example, the circumferential position of a portion of the outer edge portion 35c closer to the other circumferential side.

[0058] As shown in Fig. 4, the cam flange portion 37 has an insertion hole 37d recessed from the left face of the cam flange portion 37 to the right. The insertion hole 37d is, for example, a circular hole penetrating the cam flange portion 37 in the left-right direction. The insertion hole 37d is, for example, provided in a portion of the cam flange portion 37 where the cam surface 37a is not provided on the radial outer surface. The insertion hole 37d is, for example, located on one circumferential side of the cam surface 37a. The insertion hole 37d is a portion of the contact member 32 to which the first elastic member 33 is connected.

[0059] As shown in FIG. 6, in this embodiment, the side surface on one circumferential side (+θ side) of the cam flange portion 37 is a flat first opposing surface 37e facing one circumferential side. That is, the contact member 32 has a flat first opposing surface 37e facing the circumferential direction (rotation direction). The first opposing surface 37e is, for example, a flat surface perpendicular to the circumferential direction. The first opposing surface 37e extends in the radial direction. The first opposing surface 37e is a circumferential side surface of the contact member 32. The first opposing surface 37e is located radially outward from the insertion hole 37d. That is, the first opposing surface 37e is located radially outward from a portion of the contact member 32 to which the first elastic member 33 is connected. The first opposing surface 37e is a portion of the contact member 32 facing a stopper portion 110 described later.

[0060] The first elastic member 33 connects the fixed member 31 and the contact member 32. As shown in Figs. 2 and 4, in this embodiment, the first elastic member 33 is a coil spring that extends in the left-right direction and surrounds the driven shaft 20. The first elastic member 33 is, for example, a torsion coil spring. That is, in this embodiment, the first elastic member 33 is elastically deformable in the circumferential direction. The first elastic member 33 elastically deforms in the circumferential direction as the fixed member 31 and the contact member 32 rotate relative to each other in the circumferential direction.

[0061] In this embodiment, the medium diameter portion 23 passes through the inside of the first elastic member 33 in the left-right direction. The first elastic member 33 is located between the fixed member 31 and the contact member 32 in the left-right direction. As shown in Fig. 4, the first elastic member 33 has an elastic member main body 33a and inserted portions 33b and 33c.

[0062] The elastic member main body 33a is a portion formed by winding the wire constituting the first elastic member 33 in a spiral shape around the central axis J4. As shown in FIG. 2, a portion of the second portion 34b of the tubular portion 34 that protrudes to the right of the fixing hole 35g is inserted into the inside of the left end of the elastic member main body 33a. This makes it possible to suppress radial displacement of the first elastic member 33 relative to the fixed member 31. In this embodiment, the outer diameter of the portion of the second portion 34b that protrudes to the right of the fixing hole 35g becomes smaller toward the right, so that the second portion 34b can be easily inserted into the inside of the left end of the elastic member main body 33a.

[0063] The second protrusion 36c of the tube portion 36 is inserted into the inside of the right end of the elastic member main body 33a. This makes it possible to suppress the first elastic member 33 from being displaced radially relative to the contact member 32. In this embodiment, since the outer diameter of the second protrusion 36c is smaller than the outer diameter of the base portion 36a, the outer diameter of the second protrusion 36c can be made relatively small, and the second protrusion 36c can be easily inserted into the inside of the right end of the elastic member main body 33a. In addition, in this embodiment, since the outer diameter of the second protrusion 36c becomes smaller toward the left side, it is easier to insert the second protrusion 36c into the inside of the right end of the elastic member main body 33a. A part of the left side portion of the elastic member main body 33a is located radially inside the outer edge portion 35c. In other words, a part of the first elastic member 33 overlaps with the outer edge portion 35c when viewed in the radial direction centered on the central axis J4.

[0064] As shown in FIG. 4, the inserted portion 33b extends leftward from the left end of the wire constituting the elastic member main body 33a. The inserted portion 33b is inserted into the insertion hole 35f of the fixed member 31. In this way, the first elastic member 33 is attached to the fixed member 31. In this embodiment, the first elastic member 33 is attached to the driven shaft 20 via the fixed member 31. The inserted portion 33c extends rightward from the right end of the wire constituting the elastic member main body 33a. The inserted portion 33c is inserted into the insertion hole 37d of the contact member 32. In this way, the first elastic member 33 is attached to the contact member 32.

[0065] As shown in FIG. 3, the pawl member 40 is located, for example, below the movable part 30. In this embodiment, the pawl member 40 is rotatably supported by a support shaft 44. The support shaft 44 is, for example, cylindrical and extends in the left-right direction about a rotation axis J5 parallel to the power shaft J1. The rotation axis J5 is, for example, located forward and below the central axis J4. The rotation axis J5 is, for example, located forward and above the intermediate shaft J2. Although not shown, the right end of the support shaft 44 is fitted and supported in a hole provided in the partition wall 87a. The left end of the support shaft 44 is fitted and supported in a hole provided in the left wall part 88a.

[0066] A torsion coil spring 45 is attached to the support shaft 44. One end of the torsion coil spring 45 is fixed to the pawl member 40. Although not shown, the other end of the torsion coil spring 45 is fixed to the partition wall 87a. The torsion coil spring 45 applies an elastic force to the pawl member 40 in one circumferential direction (+θ direction).

[0067] The pawl member 40 has an arm portion 41, a claw portion 42, and a roller 43. The arm portion 41 extends rearward (-X side) from a support shaft 44. As shown in Fig. 6, a hole portion 41a penetrating the arm portion 41 in the left-right direction is provided at the front end of the arm portion 41. The support shaft 44 passes through the hole portion 41a in the left-right direction. The rear end of the arm portion 41 is located below the cam surface 37a.

[0068] The claw portion 42 protrudes downward from the rear end (-X side) of the arm portion 41. The roller 43 is attached to the upper side of the rear end of the arm portion 41. In this embodiment, the roller 43 is a part that contacts the movable portion 30. The roller 43 is attached to the arm portion 41 so as to be rotatable about a rotation axis that extends in the left-right direction. The roller 43 contacts the cam surface 37a from below.

[0069] The pawl member 40 moves in association with the rotation of the movable part 30. In this embodiment, the pawl member 40 swings about the rotation axis J5 in association with the rotation of the contact member 32 about the central axis J4. As a result, the rear end of the pawl member 40 moves in the up-down direction in association with the rotation of the contact member 32 about the central axis J4. In this embodiment, the pawl member 40 receives an elastic force from the torsion coil spring 45 in one circumferential direction, so that the roller 43 provided at the rear end of the pawl member 40 receives an upward force from the torsion coil spring 45 and is pressed against the cam surface 37a from below.

[0070] In this embodiment, the parking gear 50 is located below the pawl member 40. More specifically, the parking gear 50 is located below the claw portion 42. In this embodiment, the parking gear 50 is not located on an extension of the driven shaft 20. In other words, in this embodiment, the driven shaft 20 is located outside the area in which the parking gear 50 is provided, as viewed in the left-right direction.

[0071] As shown in Fig. 1, the parking gear 50 is fixed, for example, to the left end of the intermediate shaft 83d. Thus, in this embodiment, the parking gear 50 is fixed to the second gear 83b via the intermediate shaft 83d. The parking mechanism 10 is attached to the transmission mechanism 80b via the parking gear 50. The parking gear 50 is rotatable around the intermediate shaft J2. The parking gear 50 may be fixed to the second gear 83b via the third gear 83c, or may be directly fixed to the second gear 83b.

[0072] 3 and 6, the parking gear 50 has a plurality of teeth 51 spaced apart around the intermediate shaft J2. The claws 42 can be inserted between the teeth 51. This allows the parking gear 50 to mesh with the claws 42.

[0073] As shown in FIG. 4, the second elastic member 60 has a leaf spring portion 61 and a roller 62. The leaf spring portion 61 is plate-shaped with a plate surface facing the up-down direction. The leaf spring portion 61 extends in the front-rear direction. A front end of the leaf spring portion 61 is fixed to the housing 85 by, for example, a screw 63. A rear portion of the leaf spring portion 61 is located below the fixed member 31. The rear portion of the leaf spring portion 61 is elastically displaceable in the up-down direction with the front end of the leaf spring portion 61 fixed by the screw 63 as a fulcrum.

[0074] The leaf spring portion 61 has a base 61a and a pair of arms 61b, 61c. The base 61a is, for example, a front portion of the leaf spring portion 61. The base 61a is fixed to the housing 85 by, for example, a screw 63. The pair of arms 61b, 61c extend rearward from the rear end of the base 61a. The pair of arms 61b, 61c are arranged side by side with a gap in the left-right direction. The arm 61c is located on the right side of the arm 61b. The left-right position between the pair of arms 61b, 61c in the left-right direction is, for example, the same as the left-right position of the outer edge portion 35c. For example, the outer edge portion 35c is passed in the up-down direction between the pair of arms 61b, 61c in the left-right direction.

[0075] The roller 62 is rotatable around a rotation axis extending in the left-right direction. The roller 62 is attached to the rear end of the leaf spring portion 61. The roller 62 extends in the left-right direction. The roller 62 connects the rear ends of the pair of arms 61b, 61c. The left end of the roller 62 is rotatably supported by the rear end of the arm 61b. The right end of the roller 62 is rotatably supported by the rear end of the arm 61c. The roller 62 is located below the outer edge portion 35c. The roller 62 is in contact with the radially outer surface of the outer edge portion 35c.

[0076] The roller 62 can be fitted into the groove 35h and can be caught in the groove 35h in the circumferential direction about the central axis J4. As a result, the second elastic member 60 is caught in the groove 35h in the circumferential direction about the central axis J4. Fig. 4 shows, for example, a state in which the roller 62 is fitted into the first groove 35d and caught in the circumferential direction.

[0077] FIG. 3 shows a case where the parking mechanism 10 is in an unlocked state in which the rotation of the axle 86 is permitted. In the unlocked state, the claw portion 42 of the pawl member 40 is separated upward from the parking gear 50, and the claw portion 42 is not located between the teeth 51. That is, in the unlocked state, the pawl member 40 is located in a non-parking position in which the claw portion 42 is separated from the parking gear. In this state, the parking gear 50 can rotate around the intermediate shaft J2, and each gear of the reduction gear 83 can also rotate. Therefore, the rotation from the power unit 80a is transmitted to the axle 86 via the reduction gear 83 and the differential gear 84, and the axle 86 can rotate. In the unlocked state, the roller 62 is hooked in the circumferential direction in the first groove portion 35d. That is, when the rotation angle of the driven shaft 20 is a rotation angle that puts the pawl member 40 in the non-parking position, the second elastic member 60 is hooked in the first groove portion 35d. In the unlocked state, the roller 43 of the pawl member 40 is in contact with the first cam portion 37b.

[0078] In the unlocked state, when the driven shaft 20 is rotated in the other circumferential direction (-θ direction) by the electric actuator 90, the movable part 30 also rotates in the other circumferential direction together with the driven shaft 20. When the contact member 32 rotates in the other circumferential direction from the unlocked state, the part of the cam surface 37a that contacts the roller 43 changes from the first cam part 37b to the second cam part 37c as shown in FIG. 6. Since the second cam part 37c is located radially outward of the first cam part 37b, the roller 43 is pushed downward by the second cam part 37c, and the rear end part of the pawl member 40 is moved downward. As a result, the claw part 42 enters between the teeth parts 51 of the parking gear 50 and meshes with the parking gear 50. In other words, the position of the pawl member 40 becomes the parking position where the claw part 42 meshes with the parking gear 50.

[0079] When the claw portion 42 meshes with the parking gear 50, the rotation of the parking gear 50 around the intermediate shaft J2 is prevented. Therefore, the rotation of the intermediate shaft 83d, the second gear 83b, and the third gear 83c to which the parking gear 50 is fixed is prevented. As a result, the parking mechanism 10 is in a locked state in which the rotation of the axle 86 is prevented. In the locked state, the roller 62 is hooked in the circumferential direction in the second groove portion 35e. In other words, when the rotation angle of the driven shaft 20 is a rotation angle that brings the pawl member 40 into the parking position, the second elastic member 60 is hooked in the second groove portion 35e.

[0080] In the locked state, when the driven shaft 20 is rotated in one circumferential direction (+θ direction) by the electric actuator 90, the movable part 30 also rotates in one circumferential direction together with the driven shaft 20. When the contact member 32 rotates in one circumferential direction from the locked state, the part of the cam surface 37a that contacts the roller 43 changes from the second cam part 37c to the first cam part 37b. As a result, the rear end of the pawl member 40 is moved upward by the elastic force of the coil spring 45, and the claw part 42 moves upward from between the teeth parts 51 of the parking gear 50. In other words, the position of the pawl member 40 becomes the non-parking position where the claw part 42 moves away from the parking gear 50. As a result, the parking mechanism 10 becomes in the unlocked state again.

[0081] As described above, the driven shaft 20 is rotated by the electric actuator 90, and the position of the pawl member 40 is switched between the parking position and the non-parking position in accordance with the rotation of the movable part 30. This causes the parking mechanism 10 to be switched between a locked state and an unlocked state.

[0082] As shown in FIG. 6, the parking mechanism 10 includes a stopper portion 110. In this embodiment, the stopper portion 110 is provided on the inner wall of the housing 85. More specifically, the stopper portion 110 is provided on a portion of the inner wall of the second housing 85b that is different from the partition wall 87a. In this embodiment, the stopper portion 110 is provided on the rear wall portion 88e located on the rear side (-X side) of the inner wall of the second housing 85b. The stopper portion 110 protrudes forward (+X side) from a portion of the rear wall portion 88e located below the stopper portion 110. The stopper portion 110 is formed, for example, by a step portion provided on the rear wall portion 88e.

[0083] In this embodiment, the stopper portion 110 has a flat second opposing surface 110a that faces the first opposing surface 37e in the circumferential direction (rotation direction). That is, the stopper portion 110 faces the first opposing surface 37e, which is the circumferential side surface of the contact member 32, in the circumferential direction. The second opposing surface 110a is a step surface of a step portion provided in the rear wall portion 88e. The second opposing surface 110a is a surface facing downward. More specifically, the second opposing surface 110a faces downward and diagonally forward (+X side). The second opposing surface 110a faces the other circumferential side (-θ side). As shown in FIG. 7, the first opposing surface 37e and the second opposing surface 110a can come into contact with each other. That is, the stopper portion 110 can come into contact with the movable portion 30 in the rotation direction (circumferential direction) of the movable portion 30. Furthermore, the contact member 32 is capable of coming into contact with the stopper portion 110 in the rotational direction (circumferential direction).

[0084] The stopper portion 110 faces the contact member 32 with a gap therebetween in the circumferential direction (rotation direction) when the position of the pawl member 40 is switched between the parking position and the non-parking position. In other words, the stopper portion 110 and the contact member 32 do not come into contact with each other when the position of the pawl member 40 is switched between the parking position and the non-parking position. Note that "the stopper portion 110 faces the contact member 32 with a gap therebetween in the rotation direction when the position of the pawl member 40 is switched between the parking position and the non-parking position" means that the contact member 32 does not come into contact with the stopper portion 110 within the range in which the contact member 32 rotates when the position of the pawl member 40 is switched between the parking position and the non-parking position.

[0085] In this embodiment, the stopper portion 110 is located on one circumferential side (+θ side) of the contact member 32. That is, in this embodiment, the stopper portion 110 is located on the side to which the contact member 32 moves when the position of the pawl member 40 is switched from the parking position to the non-parking position in the circumferential direction (rotational direction) relative to the contact member 32.

[0086] As shown in FIG. 6, the circumferential angle φ1 between the end of the cam surface 37a on the side farther from the stopper portion 110 in the circumferential direction (−θ side) and the portion of the cam surface 37a in contact with the pawl member 40 is larger than the circumferential angle φ2 between the end of the cam surface 37a on the side closer to the stopper portion 110 in the circumferential direction (+θ side) and the stopper portion 110. In this embodiment, the end of the cam surface 37a on the side farther from the stopper portion 110 in the circumferential direction is the end of the first cam portion 37b on the other circumferential side (−θ side). In this embodiment, the end of the cam surface 37a on the side closer to the stopper portion 110 in the circumferential direction is the end of the second cam portion 37c on one circumferential side (+θ side). In this embodiment, the angle φ2 is the circumferential angle between the first opposing surface 37e and the second opposing surface 110a. That is, in this embodiment, the angle φ2 is the circumferential angle between the stopper portion 110 and the contact member 32.

[0087] In this embodiment, the electric actuator 90 that drives the parking mechanism 10 obtains the rotation angle range of the driven shaft 20 required to switch the position of the pawl member 40 between the parking position and the non-parking position by performing abutment control. As shown in Fig. 8, in the abutment control, the electric actuator 90 rotates the driven shaft 20 until the movable part 30 abuts against a part of the housing 85, and obtains the rotation angle of the driven shaft 20 at the time when the movable part 30 abuts against the part of the housing 85. Based on the obtained rotation angle, the electric actuator 90 determines the rotation angle range of the driven shaft 20 within a range in which the movable part 30 does not abut against the part of the housing 85.

[0088] Specifically, in the abutment control of this embodiment, the electric actuator 90 abuts the fixed member 31 against the abutment portion 120 of the housing 85, and acquires the rotation angle of the driven shaft 20 when the fixed member 31 abuts against the abutment portion 120. In this manner, the housing 85 has the abutment portion 120 that can come into contact with the fixed member 31 in the circumferential direction. In this embodiment, the abutment portion 120 is provided on the inner wall of the housing 85. More specifically, the abutment portion 120 is provided on a portion of the inner wall of the second housing 85b that is different from the partition wall 87a. In this embodiment, the abutment portion 120 is provided on the rear wall portion 88e.

[0089] The abutment portion 120 is located to the left (+Y side) and above the stopper portion 110. The abutment portion 120 protrudes forward (+X side) from a portion of the rear wall portion 88e that is located below the abutment portion 120. The abutment portion 120 protrudes, for example, forward from the stopper portion 110. The abutment portion 120 is formed, for example, by a step portion provided in the rear wall portion 88e.

[0090] In this embodiment, the abutting portion 120 has a flat fourth opposing surface 120a that faces the third opposing surface 35i in the circumferential direction (rotation direction). The fourth opposing surface 120a is a step surface of a step portion provided on the rear wall portion 88e. The fourth opposing surface 120a is a surface facing downward. More specifically, the fourth opposing surface 120a faces downward and diagonally rearward (-X side). The fourth opposing surface 120a faces the other circumferential side (-θ side). The fourth opposing surface 120a extends in a direction inclined toward the circumferential direction with respect to the radial direction. The fourth opposing surface 120a is located on the other circumferential side as it moves toward the radially outer side. In the abutting control, the third opposing surface 35i comes into contact with the fourth opposing surface 120a, so that the fixed member 31 abuts against the abutting portion 120.

[0091] In this embodiment, the abutting portion 120 is located on one circumferential side (+θ side) of the fixed member 31. That is, in this embodiment, the abutting portion 120 is located on the same side in the circumferential direction (rotational direction) as the side on which the stopper portion 110 is located with respect to the contact member 32 with respect to the fixed member 31. In this embodiment, the circumferential angle φ2 between the stopper portion 110 and the contact member 32 is larger than the circumferential angle φ3 between the abutting portion 120 and the fixed member 31. The angle φ3 is the circumferential angle between the third opposing surface 35i and the fourth opposing surface 120a.

[0092] According to this embodiment, the stopper portion 110 is provided, and the contact member 32 of the movable portion 30 can contact the stopper portion 110 in the rotation direction (circumferential direction) of the movable portion 30. Therefore, the stopper portion 110 can stop the rotation of the contact member 32 more than necessary, and the contact member 32 can be prevented from rotating too much. This can prevent the contact member 32 from coming off the pawl member 40. Therefore, it is possible to prevent malfunctions in the operation of the parking mechanism 10, and the reliability of the parking mechanism 10 can be improved. In addition, since the contact member 32 can be prevented from rotating too much, it is possible to prevent the first elastic member 33 that connects the contact member 32 to the driven shaft 20 from being elastically deformed too much. This can prevent the first elastic member 33 from being damaged.

[0093] For example, when the position of the pawl member 40 is switched from the parking position to the non-parking position, if the claw portion 42 of the pawl member 40 faces the tooth portion 51 of the parking gear 50 as shown in FIG. 7, the claw portion 42 may come into contact with the tooth portion 51 and the pawl member 40 may jump up. In this case, the pawl member 40 is pressed from below against the cam surface 37a of the contact member 32. Here, just before the position of the pawl member 40 is switched from the parking position to the non-parking position, the pawl member 40 is in contact with the connection cam portion 37f of the cam surface 37a that is inclined with respect to the circumferential direction. Therefore, the pawl member 40 is pressed from below against the connection cam portion 37f, and a circumferential force is applied from the pawl member 40 to the connection cam portion 37f. As a result, the contact member 32 is rotated by the pawl member 40. Specifically, in this embodiment, the contact member 32 is rotated by the pawl member 40 in one circumferential direction (+θ direction). That is, the contact member 32 is rotated in a direction in which the position of the pawl member 40 returns to the non-parking position. At this time, since the pawl member 40 comes into contact with the tooth portion 51 and is bounced up, an impact is also applied to the contact member 32 in one circumferential direction direction via the pawl member 40, and the contact member 32 is likely to rotate significantly in one circumferential direction direction. Therefore, there is a possibility that the contact member 32 is particularly likely to come off the pawl member 40. Specifically, as a result of the contact member 32 rotating too much in one circumferential direction direction, the end of the cam surface 37a on the other circumferential side (-θ side) may move further toward the one circumferential direction side than the roller 43 of the pawl member 40, and the pawl member 40 may no longer contact the contact member 32.

[0094] In contrast, according to this embodiment, the stopper portion 110 is located on the side (+θ side) to which the contact member 32 moves when the position of the pawl member 40 is switched from the parking position to the non-parking position in the circumferential direction (rotation direction) with respect to the contact member 32. Therefore, even if the contact member 32 is rotated in a direction in which the position of the pawl member 40 returns to the non-parking position when the pawl member 40 is flipped up, the rotation of the contact member 32 can be stopped by the stopper portion 110. As a result, even if the claw portion 42 comes into contact with the tooth portion 51 and the pawl member 40 is flipped up, the contact member 32 can be prevented from coming off the pawl member 40. Therefore, it is possible to further prevent malfunctions in the operation of the parking mechanism 10, and to further improve the reliability of the parking mechanism 10.

[0095] Furthermore, according to this embodiment, the contact member 32 protrudes radially outward from the driven shaft 20 and is rotatable in the circumferential direction about the central axis J4. The stopper portion 110 faces in the circumferential direction a first opposing surface 37e which is a circumferential side surface of the contact member 32. Therefore, the stopper portion 110 can receive the first opposing surface 37e of the contact member 32 and appropriately stop the rotation of the contact member 32.

[0096] Further, according to this embodiment, the portion of the contact member 32 facing the stopper portion 110, i.e., the first opposing surface 37e, is located radially outward from the portion of the contact member 32 to which the first elastic member 33 is connected. Therefore, the radial position of the first opposing surface 37e of the contact member 32 facing the stopper portion 110 can be made relatively radially outward. This makes it possible to relatively increase the moment around the central axis J4 generated in the contact member 32 by the reaction force received from the stopper portion 110 when the first opposing surface 37e comes into contact with the stopper portion 110. Therefore, the rotation of the contact member 32 can be more suitably stopped by the stopper portion 110. Also, the radial position of the connection portion of the first elastic member 33 in the contact member 32, i.e., the insertion hole 37d, can be made relatively radially inward. Therefore, it is easy to reduce the amount of movement of the inserted portion 33c of the first elastic member 33 in the circumferential direction when the contact member 32 rotates relative to the fixed member 31. This makes it easy to reduce the amount of elastic deformation of the first elastic member 33 in the circumferential direction, and makes it easy to prevent the first elastic member 33 from being damaged.

[0097] According to this embodiment, the angle φ1 in the circumferential direction (rotation direction) between the end of the cam surface 37a farther from the stopper portion 110 in the circumferential direction (rotation direction) and the portion of the cam surface 37a in contact with the pawl member 40 is larger than the angle φ2 in the circumferential direction (rotation direction) between the end of the cam surface 37a closer to the stopper portion 110 in the circumferential direction (rotation direction) and the stopper portion 110. Therefore, even if the contact member 32 rotates to one side in the circumferential direction (+θ side) when the pawl member 40 is flipped up as described above, the contact member 32 and the stopper portion 110 come into contact with each other in the circumferential direction before the end of the cam surface 37a on the other side in the circumferential direction (−θ side) is positioned on the one side in the circumferential direction relative to the roller 43 of the pawl member 40. This allows the stopper portion 110 to stop the rotation of the contact member 32 before the pawl member 40 comes off the cam surface 37a. Therefore, the contact member 32 can be more effectively prevented from coming off the pawl member 40, and the reliability of the parking mechanism 10 can be more effectively improved.

[0098] Further, according to this embodiment, the contact member 32 has a flat first opposing surface 37e facing the circumferential direction (rotation direction). The stopper portion 110 has a flat second opposing surface 110a facing the first opposing surface 37e in the circumferential direction (rotation direction). The first opposing surface 37e and the second opposing surface 110a can contact each other. Therefore, as shown in FIG. 7, the contact member 32 can be easily brought into surface contact with the stopper portion 110. This makes it easy for the stopper portion 110 to favorably receive the contact member 32. Therefore, the stopper portion 110 can more favorably stop the rotation of the contact member 32. In addition, since the load applied to the contact member 32 from the stopper portion 110 can be distributed, deformation of the contact member 32 can be suppressed.

[0099] Furthermore, according to this embodiment, the angle φ2 in the circumferential direction (rotational direction) between the stopper portion 110 and the contact member 32 is larger than the angle φ3 in the circumferential direction (rotational direction) between the abutment portion 120 and the fixed member 31. Therefore, when performing the above-mentioned abutment control, it is possible to prevent the contact member 32 from contacting the stopper portion 110 before the fixed member 31 contacts the abutment portion 120. This allows the above-mentioned abutment control to be performed favorably.

[0100] Further, according to this embodiment, the fixed member 31 has a groove portion 35h in which the second elastic member 60 is hooked. Therefore, by hooking the second elastic member 60 in the groove portion 35h, the second elastic member 60 can be prevented from moving, and the driven shaft 20 can be prevented from rotating around the center axis J4. As a result, even when the power supply to the electric actuator 90 is turned off, for example, the position of the driven shaft 20 can be maintained, and the state of the parking mechanism 10 can be maintained. On the other hand, when the driven shaft 20 is rotated by the electric actuator 90, the second elastic member 60 is elastically displaced, so that the second elastic member 60 can be removed from the groove portion 35h, and the driven shaft 20 and the movable part 30 can be rotated. Therefore, the state of the parking mechanism 10 can be switched.

[0101] Furthermore, according to the present embodiment, the stopper portion 110 is provided on the inner wall of the housing 85. Therefore, compared to the case where the stopper portion 110 is fixed to the housing 85 as a separate member, an increase in the number of parts of the drive device 100 can be suppressed.

[0102] According to this embodiment, the stopper portion 110 is provided in a portion of the inner wall of the second housing 85b different from the partition wall 87a. The partition wall 87a is a wall that separates the inside of the first housing 85a from the inside of the second housing 85b, and therefore has a relatively large number of structures in the inner wall of the second housing 85b, such as a hole through which the power shaft 81a passes and a bearing that rotatably supports the power shaft 81a. Therefore, by providing the stopper portion 110 in a portion of the inner wall of the second housing 85b different from the partition wall 87a, the degree of freedom in arranging the stopper portion 110 can be improved. Therefore, the stopper portion 110 can be easily provided in the housing 85.

[0103] The present invention is not limited to the above-described embodiment, and other configurations and methods may be adopted within the scope of the technical concept of the present invention. The predetermined direction in which the central axis of the driven shaft extends is not particularly limited. The predetermined direction in which the central axis of the driven shaft extends may be a direction perpendicular to the rotation axis of the parking gear. For example, in the above-described embodiment, the central axis J4 and the driven shaft 20 may extend in the vertical direction.

[0104] The stopper portion may have any configuration as long as it is capable of contacting the movable portion in the rotational direction of the movable portion and faces the contact member with a gap in the rotational direction when the position of the pawl member is switched between the parking position and the non-parking position. The stopper portion may be a separate member from the housing and fixed to the housing. In this case, the stopper portion may be, for example, a rod-shaped member. The stopper portion may be located on the side of the contact member to which the contact member moves when the position of the pawl member is switched from the non-parking position to the parking position in the rotational direction.

[0105] The movable part may have any configuration as long as it has a first elastic member and a contact member and rotates with the rotation of the driven shaft. The portion of the contact member that contacts the pawl member does not have to be a cam surface and may have any configuration as long as it can move the pawl member. When the movable part has a fixed member and a contact member, the fixed member and the contact member may be disposed in any relative positions. The fixed member may not be provided. In this case, the first elastic member may be directly attached to the driven shaft. The abutting portion may not be provided.

[0106] The pawl member may be movable in any manner so long as it moves in conjunction with the movement of the movable part. The pawl member may be configured to move linearly as a whole in one direction without swinging. A groove portion into which the second elastic member is hooked may be provided in the contact member. Only one groove portion may be provided, or three or more groove portions may be provided. No groove portion may be provided. The parking gear may be attached to any location of the transmission mechanism.

[0107] The power unit does not have to be a motor. The power unit may be, for example, an engine. The structure of the transmission mechanism is not particularly limited. The configurations and methods described in this specification above can be appropriately combined within a range that does not contradict each other. [Explanation of symbols]

[0108] 10... parking mechanism, 20... driven shaft, 30... movable part, 31... fixed member, 32... contact member, 33... first elastic member, 35h... groove portion, 37a... cam surface, 37e... first opposing surface, 40... pawl member, 42... claw portion, 50... parking gear, 60... second elastic member, 80a... power section, 80b... transmission mechanism section, 85... housing, 85a... first housing, 85b... second housing, 87a... partition wall, 100... drive device, 110... stopper portion, 110a... second opposing surface, 120... abutment portion, J4... central axis

Claims

1. A driven shaft that is rotatable about a central axis extending in a predetermined direction; a movable part that rotates in association with the rotation of the driven shaft; A pawl member having a claw portion and moving in association with the rotation of the movable portion; a parking gear with which the claw portion can mesh; a stopper portion capable of coming into contact with the movable portion in a rotation direction of the movable portion; Equipped with a position of the pawl member is switched between a parking position where the pawl portion meshes with the parking gear and a non-parking position where the pawl portion is separated from the parking gear in accordance with rotation of the movable part; The movable part is a first elastic member attached to the driven shaft; a contact member connected to the driven shaft via the first elastic member and in contact with the pawl member; having the contact member has a cam surface that contacts the pawl member, and is rotatable relative to the driven shaft in the rotational direction by the first elastic member being elastically deformed, and is capable of contacting the stopper portion in the rotational direction; the stopper portion faces the contact member in the rotational direction when the position of the pawl member is switched between the parking position and the non-parking position, a parking mechanism in which the angle in the rotational direction between the end of the cam surface that is farther from the stopper portion in the rotational direction and the portion of the cam surface that is in contact with the pawl member is greater than the angle in the rotational direction between the end of the cam surface that is closer to the stopper portion in the rotational direction and the stopper portion.

2. The parking mechanism according to claim 1 , wherein the stopper portion is located on a side of the contact member to which the contact member moves when a position of the pawl member is switched from the parking position to the non-parking position in the rotational direction.

3. the contact member protrudes radially outward from the driven shaft and is rotatable in a circumferential direction about the central axis; The parking mechanism according to claim 1 , wherein the stopper portion circumferentially faces a circumferential side surface of the contact member.

4. The parking mechanism according to claim 3 , wherein a portion of the contact member that faces the stopper portion is located radially outward of a portion of the contact member to which the first elastic member is connected.

5. The contact member has a flat first opposing surface facing the rotation direction, The stopper portion has a flat second opposing surface that faces the first opposing surface in the rotational direction, The parking mechanism according to claim 1 , wherein the first opposing surface and the second opposing surface are capable of contacting each other.

6. A drive device mounted on a vehicle, A power unit that drives the drive device; a transmission mechanism connected to the power unit; The parking mechanism according to claim 1 , which is attached to the transmission mechanism; a housing that accommodates the power unit, the transmission mechanism unit, and the parking mechanism therein; A drive device comprising:

7. the movable portion has a fixed member fixed to the driven shaft, the first elastic member is attached to the driven shaft via the fixed member and connects the fixed member and the contact member; the housing has an abutment portion capable of coming into contact with the fixed member in the rotational direction, the abutting portion is located on the same side of the fixed member as the stopper portion is located on with respect to the contact member in the rotation direction, The drive device according to claim 6 , wherein an angle in the rotational direction between the stopper portion and the contact member is larger than an angle in the rotational direction between the abutment portion and the fixed member.

8. A drive device mounted on a vehicle, A power unit that drives the drive device; a transmission mechanism connected to the power unit; a parking mechanism attached to the transmission mechanism; a housing that accommodates the power unit, the transmission mechanism unit, and the parking mechanism therein; Equipped with The parking mechanism includes: A driven shaft that is rotatable about a central axis extending in a predetermined direction; a movable part that rotates in association with the rotation of the driven shaft; A pawl member having a claw portion and moving in association with the rotation of the movable portion; a parking gear with which the claw portion can mesh; a stopper portion capable of coming into contact with the movable portion in a rotation direction of the movable portion; having a position of the pawl member is switched between a parking position where the pawl portion meshes with the parking gear and a non-parking position where the pawl portion is separated from the parking gear in accordance with rotation of the movable part; The movable part is a first elastic member attached to the driven shaft; a contact member connected to the driven shaft via the first elastic member and in contact with the pawl member; a fixed member fixed to the driven shaft; having the contact member is rotatable relative to the driven shaft in the rotational direction by the first elastic member being elastically deformed, and is capable of contacting the stopper portion in the rotational direction; the stopper portion faces the contact member in the rotational direction when the position of the pawl member is switched between the parking position and the non-parking position, the first elastic member is attached to the driven shaft via the fixed member and connects the fixed member and the contact member; the housing has an abutment portion capable of coming into contact with the fixed member in the rotational direction, the abutting portion is located on the same side of the fixed member as the stopper portion is located on with respect to the contact member in the rotation direction, A drive device, wherein an angle in the rotational direction between the stopper portion and the contact member is larger than an angle in the rotational direction between the abutment portion and the fixed member.

9. A drive device as described in Claim 8, wherein the stopper portion is located on the side of the contact member to which the contact member moves when the position of the pawl member is switched from the parking position to the non-parking position in the rotational direction.

10. The contact member protrudes radially outward from the driven shaft and is rotatable in a circumferential direction about the central axis, The drive device according to claim 8 , wherein the stopper portion circumferentially faces a circumferential side surface of the contact member.

11. A drive device as described in Claim 10, wherein a portion of the contact member facing the stopper portion is located radially outward from a portion of the contact member to which the first elastic member is connected.

12. The contact member has a flat first opposing surface facing the rotational direction, The stopper portion has a flat second opposing surface that faces the first opposing surface in the rotational direction, The drive device according to claim 8 , wherein the first opposing surface and the second opposing surface are capable of coming into contact with each other.

13. The parking mechanism further includes a second elastic member. The drive unit according to claim 7 , wherein the fixed member has a groove into which the second elastic member is hooked.

14. The drive unit according to claim 6 , wherein the stopper portion is provided on an inner wall of the housing.

15. The housing includes: a first housing that accommodates the power unit therein; a second housing that accommodates the transmission mechanism therein; a partition wall that separates an interior of the first housing from an interior of the second housing; having The drive unit according to claim 14 , wherein the stopper portion is provided on an inner wall of the second housing at a portion different from the partition wall.

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