CN114321357B - Parking mechanism and driving device - Google Patents

Abstract

The present invention provides a parking mechanism and a driving device, wherein one mode of the parking mechanism comprises: a driven shaft rotatable about a central axis extending in a predetermined direction; a movable portion that moves in accordance with rotation of the driven shaft; a stopper member having a claw portion and moving in association with the movement of the movable portion; and a parking gear that is capable of meshing with the claw portion. The position of the stopper member is switched to a parking position where the pawl portion is engaged with the parking gear and a non-parking position where the pawl portion is away from the parking gear in association with movement of the movable portion. The portion of the driven shaft on the side opposite to the movable portion in the predetermined direction is connected to a drive source for rotating the driven shaft. The driven shaft has a first supported portion supported rotatably about a central axis. The first supported portion is located on the other side of the predetermined direction with respect to the movable portion.

Description

Parking mechanism and driving device

Technical Field

The present invention relates to a parking mechanism and a driving device.

Background

For example, patent document 1 describes a parking mechanism mounted on a vehicle.

Prior art literature

Patent literature

Patent document 1: chinese patent No. 205001503 specification

Disclosure of Invention

The parking lock mechanism is sometimes driven by rotating a driven shaft by an electric actuator. In this case, there is a possibility that a load applied to the driven shaft may cause a problem such as deformation of the driven shaft. Therefore, the operation of the parking lock mechanism may be defective.

In view of the above, it is an object of the present utility model to provide a parking mechanism having a structure capable of improving reliability, and a driving device including such a parking mechanism.

One embodiment of the parking mechanism of the present utility model includes: a driven shaft rotatable about a central axis extending in a predetermined direction; a movable portion that moves in accordance with rotation of the driven shaft; a stopper member having a claw portion and moving in association with the movement of the movable portion; and a parking gear which can be engaged with the claw portion. With the movement of the movable portion, the position of the stopper member is switched to a parking position where the claw portion is engaged with the parking gear and a non-parking position where the claw portion is away from the parking gear. The driven shaft is connected to a drive source that rotates the driven shaft at a portion of the driven shaft that is located on one side in the predetermined direction with respect to the movable portion. The driven shaft has a first supported portion supported rotatably about the central axis. The first supported portion is located on the other side of the predetermined direction with respect to the movable portion.

One embodiment of the driving device according to the present invention is a driving device mounted on a vehicle, and includes a power unit that drives the driving device, a transmission mechanism unit that is connected to the power unit, and the parking mechanism that is mounted on the transmission mechanism unit.

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

According to one aspect of the present invention, in the driving device, the reliability of the parking mechanism can be improved.

Drawings

Fig. 1 is a cross-sectional view schematically showing a driving device according to the present embodiment.

Fig. 2 is a cross-sectional view showing a part of the driving device according to the present embodiment.

Fig. 3 is a perspective view showing the parking mechanism according to the present embodiment.

Fig. 4 is an exploded perspective view showing a part of the parking mechanism according to the present embodiment.

Fig. 5 is a perspective view showing the first movable member according to the present embodiment.

Fig. 6 is a view of the parking mechanism according to the present embodiment as seen from the right side.

Symbol description

10 … parking mechanism, 20 … driven shaft, 22b … second supported portion, 24a … first supported portion, 30 … movable portion, 31 … first movable member, 32 … second movable member, 33 … first elastic member, 34 … fixed portion, 35c … outer edge portion, 35d … first groove portion, 35e … second groove portion, 35h … groove portion, 36e … through hole, 37a … cam surface, 40 … stopper member, 42 … claw portion, 50 … parking gear, 60 a … second elastic member, 80a … power portion, 80b … transmission mechanism portion, 83a … first gear, 83b … second gear, 85 … housing, 87 … first housing member, 87b … first hole portion, 88 … second housing member, 88d … second hole portion, 100 … driving apparatus, J4 … center axis.

Detailed Description

The X axis, the Y axis orthogonal to the X axis, and the Z axis orthogonal to the X axis and the Y axis are shown in each figure. In the following description, a direction parallel to the Z axis is referred to as an "up-down direction", a direction parallel to the Y axis is referred to as a "left-right direction", and a direction parallel to the X axis is referred to as a "front-back direction". The up-down direction, the left-right direction, and the front-rear direction are directions orthogonal to each other. The vertical direction is, for example, the vertical direction of a vehicle in which the drive device 100 shown in fig. 1 is mounted. The left-right direction is, for example, the left-right direction of a vehicle in which the drive device 100 is mounted. The front-rear direction is, for example, the front-rear direction of a vehicle in which the drive device 100 is mounted.

In the vertical direction, the positive side toward which the arrow of the Z axis is directed is referred to as the upper side, and the negative side opposite to the side toward which the arrow of the Z axis is directed is referred to as the lower side. In the left-right direction, the positive side toward which the arrow of the Y axis is directed is referred to as the left side, and the negative side opposite to the side toward which the arrow of the Y axis is directed is referred to as the right side. In the front-rear direction, the positive side toward which the arrow of the X axis is directed is referred to as the front side, and the negative side opposite to the side toward which the arrow of the X axis is directed is referred to as the rear side.

In the following embodiments, the left-right direction corresponds to a "predetermined direction". The left side corresponds to "one side in the predetermined direction", and the right side corresponds to "the other side in the predetermined direction". The vertical direction, the horizontal direction, the front-rear direction, the upper side, the lower side, the left side, the right side, the front side, and the rear side are only names for explaining the arrangement relationships of the respective parts, etc., and the actual arrangement relationships may be other than those represented by these names.

The driving device 100 of the present embodiment shown in fig. 1 is a driving device that is mounted on a vehicle and rotates the axle 86. As shown in fig. 1, the driving device 100 includes a power unit 80a, a transmission mechanism unit 80b, a parking mechanism 10, a housing 85, and an electric actuator 90.

The housing 85 accommodates the power unit 80a, the transmission mechanism unit 80b, and the parking mechanism 10 therein. The housing 85 includes a first housing portion 85a that houses the power unit 80a, and a second housing portion 85b that houses the transmission mechanism unit 80b and the parking mechanism 10. The second housing portion 85b is connected to, for example, the left side of the first housing portion 85 a. For example, the oil O is stored in the first housing portion 85a and the second housing portion 85b.

As shown in fig. 2, the housing 85 has a first housing member 87 and a second housing member 88. The first housing member 87 and the second housing member 88 are members different from each other. The second housing member 88 is fixed to the first housing member 87. In the present embodiment, the first housing member 87 and the second housing member 88 are fixed to form the second housing portion 85b. The second housing member 88 is located, for example, on the left side of the first housing member 87.

The first housing member 87 has a partition wall portion 87a. The partition wall 87a is a wall that separates the inside of the first housing portion 85a and the inside of the second housing portion 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 right surface of the inner surface of the second housing portion 85b.

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

The second housing member 88 is, for example, a box-shaped member that opens to the right. For example, the right-side opening of the second housing member 88 is closed by the partition wall portion 87 a. The second housing member 88 has a left side wall portion 88a and a coupling cylindrical portion 88b. The left side wall portion 88a is located, for example, on the left side of a portion of the parking mechanism 10 located in the second housing portion 85 b. The left side wall portion 88a has a recess 88c recessed from the right side of the left side wall portion 88a toward the left side. Although not shown, the concave portion 88c is, for example, circular in shape centered on the central axis J4 when viewed from the left-right direction.

The coupling cylindrical portion 88b protrudes leftward from the left side wall portion 88 a. The coupling cylindrical portion 88b opens on the left side. The connecting cylindrical portion 88b is, for example, cylindrical with the central axis J4 as the center. An oil seal 71 is held inside the coupling cylindrical portion 88b. The oil seal 71 is annular and surrounds the drive shaft 20, which will be described later.

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

In the present embodiment, the electric actuator 90 is a drive source for driving the parking mechanism 10. As shown in fig. 1, the electric actuator 90 is located outside the housing 85, for example. The electric actuator 90 is fixed to, for example, an outer surface of the second housing portion 85 b. The electric actuator 90 is coupled to the coupling cylindrical portion 88b, for example.

The power unit 80a is a portion for driving the driving device 100. In the present embodiment, the power unit 80a is an electric motor. The power unit 80a has a rotor 81 and a stator 82. The rotor 81 has a power shaft 81a rotatable about a power axis J1. The power axis J1 extends in the left-right direction, for example. The power shaft 81a is, for example, a cylindrical shape extending in the left-right direction around the power axis J1. For example, the power shaft 81a extends leftward from the inside of the first housing portion 85a, penetrates the partition wall portion 87a in the left-right direction, and protrudes into the inside of the second housing portion 85 b.

The transmission mechanism 80b is connected to the power unit 80a. The transmission mechanism 80b includes a reduction gear 83 and a differential gear 84. The speed reducing device 83 is connected to the power shaft 81 a. The speed reduction device 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 includes a first gear 83a and a second gear 83b.

The first gear 83a is fixed to the outer peripheral surface of the portion of the power shaft 81a protruding into the second housing portion 85 b. Thereby, the first gear 83a is fixed to the power unit 80a. The intermediate shaft 83d extends in the left-right direction about the intermediate axis J2, for example. The intermediate axis J2 is, for example, parallel to the power axis J1. The intermediate axis J2 is located, for example, on the lower side than the power axis J1. The second gear 83b and the third gear 83c are fixed to the outer peripheral surface of the intermediate shaft 83d. The second gear 83b and the third gear 83c are connected via an intermediate shaft 83d. The second gear 83b is meshed with the first gear 83 a. The intermediate shaft 83d, the second gear 83b, and the third gear 83c are rotatable about the intermediate axis J2.

The differential device 84 is connected to the reduction gear 83. The differential 84 rotates the axle 86. The shaft 86 rotates, for example, about an output axis J3 extending parallel to the power axis J1. The output axis J3 is disposed at a position offset from the power axis J1 and the intermediate axis J2, for example, when viewed from the left-right direction. The differential device 84 has a ring gear 84a. The ring gear 84a meshes with the third gear 83 c. The torque output from the power portion 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 storage portion 85 b. The oil O is lifted up by the rotation of the ring gear 84a. The lifted oil O is supplied as lubricating oil to the reduction gear 83 and the differential gear 84, for example.

In the present embodiment, the parking mechanism 10 is driven by the 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 rotation of the axle 86 is prevented and an unlocked state in which rotation of the axle 86 is allowed by the electric actuator 90 as a power source. When the gear of the vehicle is in the parking state, the parking mechanism 10 is in the locked state, and when the gear of the vehicle is not in the parking state, the parking mechanism 10 is in the unlocked state. The case where the gear of the vehicle is out of the parking state includes, for example, a case where the gear of the vehicle is in drive, neutral, reverse, and the like. As shown in fig. 3, the parking mechanism 10 includes a driven shaft 20, a movable portion 30, a stopper member 40, a parking gear 50, and a second elastic member 60.

The driven shaft 20 is rotatable about a central axis J4 extending in the left-right direction. The driven shaft 20 is, for example, a cylindrical shape extending in the left-right direction around the central axis J4. In the following description of the parking mechanism 10, a radial direction around the center axis J4 may be simply referred to as a "radial direction", and a circumferential direction around the center axis J4 may be simply referred to as a "circumferential direction". In each figure, the circumferential direction is appropriately indicated by an arrow θ. The side that advances clockwise about the center axis J4 when viewed from the right side in the circumferential direction, that is, the side toward which the arrow θ faces (θ side) is referred to as "circumferential side", and the side that advances counterclockwise about the center axis J4 when viewed from the right side in the circumferential direction, that is, the side opposite to the side toward which the arrow θ faces (- θ side) is referred to as "circumferential side".

As shown in fig. 2, the driven shaft 20 protrudes from the inside of the second housing portion 85b to the outside of the casing 85 via the inside of the recess portion 88c, the inside of the second hole portion 88d, and the inside of the coupling cylindrical portion 88b, for example. As shown in fig. 2 and 4, the driven shaft 20 has a coupled portion 21, a large diameter portion 22, a middle diameter portion 23, and a small diameter portion 24. The connected portion 21, the large diameter portion 22, the middle diameter portion 23, and the small diameter portion 24 are connected in this order from the left side toward the right side.

The coupled portion 21 is a portion coupled to the electric actuator 90. As shown in fig. 2, the coupled portion 21 protrudes outside the housing 85, for example. The left end of the coupled portion 21 is, for example, the left end of the driven shaft 20. The outer peripheral surface of the coupled portion 21 is provided with a spline portion, for example. The coupled portion 21 is coupled to the electric actuator 90 by fitting, for example, a spline portion to a spline groove provided in an output portion of the electric actuator 90.

In the present embodiment, the coupled portion 21 is a portion of the driven shaft 20 located on the left side of the movable portion 30. That is, in the present embodiment, the coupled portion 21, which is a portion of the driven shaft 20 located on the left side of the movable portion 30, is connected to the electric actuator 90, which is a driving source for rotating the driven shaft 20.

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 larger than the outer diameter of the connected portion 21, for example. The dimension of the large diameter portion 22 in the lateral direction is larger than the dimension of the connected portion 21 in the lateral direction, for example. The large diameter portion 22 has a sealed portion 22a and a second supported portion 22b. That is, the driven shaft 20 has a sealed portion 22a and a second supported portion 22b.

The sealed portion 22a is, for example, a left side portion of the large diameter portion 22. The sealed portion 22a is located inside the connecting tube portion 88b, for example. The outer peripheral surface of the sealed portion 22a contacts the inner peripheral surface of the oil seal 71. The oil seal 71 seals the space between the outer peripheral surface of the sealed portion 22a and the inner peripheral surface of the coupling cylindrical portion 88 b.

The second supported portion 22b is, for example, a right side portion of the large diameter portion 22. The second supported portion 22b is connected to the right side of the sealed portion 22 a. 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 the present embodiment, the second supported portion 22b is fitted into the second hole 88d with a clearance. Thereby, the second support portion 22b is rotatably supported about the central axis J4 by the inner peripheral surface of the second hole portion 88d. That is, in the present embodiment, the second hole 88d functions as a bearing portion that rotatably supports the second supported portion 22b about the central axis J4. The second supported portion 22b is located between the coupled portion 21, which is a portion of the driven shaft 20 connected to the electric actuator 90 as a driving source, and the movable portion 30 in the left-right direction.

The middle diameter portion 23 is connected to the right side of the large diameter portion 22. The outer diameter of the intermediate diameter portion 23 is smaller than the outer diameter of the large diameter portion 22, for example. The dimension of the intermediate diameter portion 23 in the lateral direction is larger than the dimension of the large diameter portion 22 in the lateral direction, for example. The intermediate diameter portion 23 is located inside the second housing portion 85b, for example. The left end of the intermediate diameter portion 23 is located inside the recess 88c, for example. The intermediate diameter portion 23 has a pin stopper hole 23a penetrating the intermediate diameter portion 23 in the radial direction. The pin stopper hole 23a is provided, for example, in a left portion of the intermediate diameter portion 23. As shown in fig. 4, the pin stopper hole 23a is, for example, a hole of a circular shape.

The small diameter portion 24 is connected to the right side of the intermediate diameter portion 23. The small diameter portion 24 has an outer diameter smaller than the outer diameter of the intermediate diameter portion 23 and the outer diameter of the connected portion 21, for example. As shown in fig. 2, the small diameter portion 24 has a first supported portion 24a. That is, the driven shaft 20 has a first supported portion 24a. The first supported portion 24a is, for example, a right side portion of the small diameter portion 24. The right end of the first supported portion 24a is, for example, the right end of the driven shaft 20. The first supported portion 24a is located on the right side of the movable portion 30.

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 the present embodiment, the first supported portion 24a is fitted into the first hole 87b with a clearance. Thereby, the first supported portion 24a is rotatably supported about the central axis J4 by the inner peripheral surface of the first hole 87b. That is, in the present embodiment, the first hole 87b functions as a bearing portion that rotatably supports the first supported portion 24a about the central axis J4.

The movable portion 30 is a portion that moves in accordance with the rotation of the driven shaft 20. In the present embodiment, the movable portion 30 rotates around the center axis J4 in accordance with the rotation of the driven shaft 20. As shown in fig. 4, the movable portion 30 has a first movable member 31, a second movable member 32, and a first elastic member 33.

The first movable member 31 has a fixed portion 34 and a flange portion 35. The fixed portion 34 and the flange portion 35 are, for example, members different from each other, and are fixed to each other. The fixed portion 34 is, for example, substantially cylindrical with the central axis J4 as the center. The fixed portion 34 is opened on both sides in the left-right direction. As shown in fig. 2, the intermediate diameter portion 23 of the driven shaft 20 penetrates in the left-right direction inside the fixed portion 34. The fixed portion 34 has a first portion 34a and a second portion 34b.

The first portion 34a is, for example, a left side portion of the fixed portion 34. The second portion 34b is, for example, a right side portion of the fixed portion 34. The second portion 34b is connected to the right side of the first portion 34 a. The outer diameter of the second portion 34b is smaller than the outer diameter of the first portion 34 a. A step having a step surface 34e is provided between the left-right direction of the first portion 34a and the second portion 34b. The step surface 34e is, for example, a surface orthogonal to the right-left direction, and is an end surface on the right side of the first portion 34 a.

The first portion 34a has a pin stop hole 34c. The pin stopper holes 34c sandwich the central axis J4 in the radial direction and are provided in a pair. The pin stopper hole 34c penetrates from the inner peripheral surface to the outer peripheral surface of the first portion 34 a. The pin stopper hole 34c is, for example, a hole of a circular shape. The first portion 34a is fixed to the intermediate diameter portion 23 by, for example, a pin 38 penetrating the pin stopper hole 34c. Thereby, the fixed portion 34 is fixed to the driven shaft 20, and the first movable member 31 is fixed to the driven shaft 20.

The pin 38 is cylindrical and extends in the radial direction about the central axis J4. The pin 38 extends from one pin stopper hole 34c of the pair of pin stopper holes 34c of the fixed portion 34 through the pin stopper hole 23a of the driven shaft 20 to the other pin stopper hole 34c of the pair of pin stopper holes 34c. The pin 38 is fitted into the pin stopper holes 23a and 34c and fixed. The pin 38 is fitted into the pin stopper holes 23a, 34c, thereby preventing relative rotation and relative movement in the left-right direction of the driven shaft 20 and the first movable member 31 about the center axis J4. As shown in fig. 4, a pair of flat surfaces 34d are provided on the outer peripheral surface of the first portion 34 a. The pair of flat surfaces 34d are rectangular surfaces orthogonal to the radial direction, and are disposed on opposite sides with respect to each other with the central axis J4 interposed therebetween.

As shown in fig. 2, a washer 70 is provided between the left end of the fixed portion 34 and the bottom surface of the recess 88 c. The washer 70 is, for example, an annular ring which surrounds the intermediate diameter portion 23 of the driven shaft 20 with the center axis J4 as the center. The gasket 70 is plate-shaped with the plate surface facing in the left-right direction. The inner diameter of the washer 70 is smaller than the outer diameter of the large diameter portion 22, for example. The left surface of the gasket 70 contacts, for example, the bottom surface of the recess 88 c. The right surface of the washer 70 contacts, for example, the left end surface of the fixed portion 34.

The flange 35 is fixed to the fixed portion 34. The flange 35 is formed by bending a plate-like member, for example. The flange portion 35 includes a base portion 35a, a connecting portion 35b, and an outer edge portion 35c. That is, the first movable member 31 has the outer edge portion 35c.

The base 35a is a portion fixed to the fixed 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 from the fixing hole 35g. The outer diameter of the portion of the second portion 34b protruding rightward from the fixing hole 35g becomes smaller toward the right, for example.

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

The connecting portion 35b connects the base portion 35a and the outer edge portion 35c. The coupling portion 35b protrudes obliquely outward and rightward in the radial direction from a part of the circumferential direction of the base portion 35 a. The coupling portion 35b protrudes, for example, from a portion of the base portion 35a located at a circumferential position different from that of the insertion hole 35f.

The outer edge portion 35c protrudes radially outward from the radially outer end portion of the coupling portion 35 b. The outer edge 35c is located further outside than the fixed portion 34 in the radial direction around the central axis J4. The outer edge portion 35c extends in the circumferential direction, for example. The circumferential dimension of the outer edge portion 35c increases from the radially inner side toward the radially outer side, for example. As shown in fig. 2, in the present embodiment, the outer edge portion 35c is located on the right side of the fixed portion 34. That is, in the present embodiment, the position of the fixed portion 34 in the left-right direction and the position of the outer edge portion 35c in the left-right direction are different from each other. In the present embodiment, the position of the fixed portion 34 in the left-right direction is a position distant from the second movable member 32 in the left-right direction from the position of the outer edge portion 35c in the left-right direction.

As shown in fig. 5, the first movable member 31 has a groove portion 35h. In the present embodiment, the groove portion 35h is provided in the outer edge portion 35c. The groove 35h is recessed radially inward from the radially outer peripheral edge of the outer edge 35c, for example. In the present embodiment, a plurality of groove portions 35h are provided. The groove portion 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 circumferentially separated from each other. For example, the second groove 35e is disposed apart from the first groove 35d toward one circumferential direction. The first groove 35d is provided, for example, at the other end of the outer edge 35c in the circumferential direction. The second groove 35e is provided, for example, at one end of the outer edge 35c in the circumferential direction.

As shown in fig. 2, the second movable member 32 is coupled to the first movable member 31 via the first elastic member 33. The second movable member 32 is relatively movable with respect to the first movable member 31. In the present embodiment, the second movable member 32 is rotatable relative to the first movable member 31 about the center axis J4. The second movable member 32 is disposed apart from the first movable member 31, for example, to the right. That is, in the present embodiment, the first movable member 31 and the second movable member 32 are arranged with a space therebetween in the left-right direction. The second movable member 32 is, for example, a single member. The second movable member 32 has a cylindrical portion 36 and a cam flange portion 37.

The cylindrical portion 36 is, for example, cylindrical with the central axis J4 as the center. The cylindrical portion 36 is opened 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 second movable member 32 has a through hole 36e through which the driven shaft 20 passes in the left-right direction. The right end of the intermediate diameter portion 23 and the left portion of the small diameter portion 24 are located inside the through hole 36e. The second movable member 32 is relatively rotatable about the center axis J4 with respect to the driven shaft 20. 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, a step surface provided at a step between the middle diameter portion 23 and the small diameter portion 24 in the left-right direction is in contact with the step surface 36 d.

The cylindrical 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 36 a. The first protruding portion 36b protrudes rightward from the base portion 36 a. The first projection 36b has an outer diameter smaller than the outer diameter of the base 36 a. The right end surface of the first protruding portion 36b is, for example, the right end surface of the second movable member 32, and contacts the left surface of the partition wall 87 a. The second protruding portion 36c protrudes from the base portion 36a to the left. The second projection 36c has an outer diameter smaller than that of the base 36 a. For example, the outer diameter of the second protruding portion 36c becomes smaller toward the left side.

The cam flange 37 extends radially outward from the base 36 a. The cam flange 37 extends downward from the base 36a, for example. As shown in fig. 4, the cam flange 37 has a substantially fan shape when viewed from the left-right direction. A part of the radially outer side surface of the cam flange portion 37 is a cam surface 37a. That is, the second movable member 32 has the cam surface 37a. The cam surface 37a extends in the circumferential direction. The cam surface 37a faces downward, for example. As shown in fig. 3 and 6, the cam surface 37a is a surface that contacts the stopper member 40. That is, in the present embodiment, the second movable member 32 is in contact with the stopper member 40 via the cam surface 37a. The cam surface 37a is located, for example, radially outward of the radially outer edge of the outer edge portion 35 c.

As shown in fig. 6, the cam surface 37a has a first cam portion 37b and a second cam portion 37c. 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 with the central axis J4 as the center. The first cam portion 37b and the second cam portion 37c are connected in the circumferential direction. The second cam portion 37c is connected to, for example, one side in the circumferential direction of the first cam portion 37 b. The second cam portion 37c is located radially outward of the first cam portion 37 b.

In the present embodiment, the cam surface 37a has a portion having the same circumferential position as the first groove portion 35 d. That is, in the present embodiment, the circumferential position of at least a part of the groove portion 35h around the center axis J4 is included in the circumferential position of the cam surface 37a around the center axis J4. In the present embodiment, the circumferential position of the cam surface 37a is a 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 near the other circumferential side.

As shown in fig. 4, the cam flange portion 37 has an insertion hole 37d recessed from the left side surface of the cam flange portion 37 toward the right side. The insertion hole 37d is, for example, a circular hole penetrating the cam flange 37 in the left-right direction. The insertion hole 37d is provided, for example, in a portion of the cam flange portion 37 where the cam surface 37a is not provided on the radially outer side surface. The insertion hole 37d is located, for example, at a position on the circumferential side of the cam surface 37 a.

The first elastic member 33 connects the first movable member 31 and the second movable member 32. As shown in fig. 2 and 4, in the present 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 the present embodiment, the first elastic member 33 is elastically deformable in the circumferential direction. The first elastic member 33 is elastically deformed in the circumferential direction by the relative rotation of the first movable member 31 and the second movable member 32 in the circumferential direction.

In the present embodiment, the intermediate diameter portion 23 penetrates the inside of the first elastic member 33 in the left-right direction. The first elastic member 33 is located between the first movable member 31 and the second movable member 32 in the left-right direction. As shown in fig. 4, the first elastic member 33 includes an elastic member main body 33a and inserted portions 33b, 33c.

The elastic member main body 33a is a portion in which a wire material constituting the first elastic member 33 is spirally wound around the center axis J4. As shown in fig. 2, a portion of the second portion 34b of the fixed portion 34 protruding rightward from the fixing hole 35g is inserted inside the left end portion of the elastic member main body 33 a. This can suppress the first elastic member 33 from being displaced in the radial direction with respect to the first movable member 31. In the present embodiment, since the outer diameter of the portion of the second portion 34b protruding rightward from the fixing hole 35g becomes smaller toward the right side, the second portion 34b is easily inserted into the inside of the left end portion of the elastic member main body 33 a.

A second protruding portion 36c of the tubular portion 36 is inserted inside the right end portion of the elastic member main body 33 a. This can suppress the first elastic member 33 from being displaced in the radial direction with respect to the second movable member 32. In the present embodiment, since 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 can be made relatively small, and the second protruding portion 36c can be easily inserted into the inside of the right side end portion of the elastic member main body 33 a. In the present embodiment, since the outer diameter of the second protruding portion 36c decreases toward the left side, it is easier to insert the second protruding portion 36c inside the right end portion of the elastic member main body 33 a. A part of the left side portion of the elastic member main body 33a is located radially inward of the outer edge portion 35 c. That is, a part of the first elastic member 33 overlaps the outer edge portion 35c when viewed in the radial direction around the central axis J4.

As shown in fig. 4, the inserted portion 33b extends leftward from the left end portion of the wire rod constituting the elastic member main body 33 a. The inserted portion 33b is inserted into the insertion hole 35f of the first movable member 31. Thereby, the first elastic member 33 is attached to the first movable member 31. The inserted portion 33c extends rightward from the right-side end of the wire constituting the elastic member main body 33 a. The inserted portion 33c is inserted into the insertion hole 37d of the second movable member 32. Thereby, the first elastic member 33 is attached to the second movable member 32.

As shown in fig. 3, the stopper member 40 is located, for example, on the lower side of the movable portion 30. In the present embodiment, the stopper member 40 is rotatably supported by the support shaft 44. The support shaft 44 is, for example, cylindrical and extends in the left-right direction around a rotation axis J5 parallel to the power axis J1. The rotation axis J5 is located, for example, at a position further forward and downward than the central axis J4. The rotation axis J5 is located, for example, at a position further forward and upward than the intermediate axis J2. Although not shown, the right end of the support shaft 44 is fitted into a hole provided in the partition wall 87a and supported. The left end of the support shaft 44 is fitted into a hole provided in the left side wall 88a and supported.

A torsion coil spring 45 is attached to the support shaft 44. One end of the torsion coil spring 45 is fixed to the stopper 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 stopper member 40 in the circumferential one-side direction (+θ direction).

The stopper member 40 has an arm portion 41, a claw portion 42, and a contact portion 43. The arm 41 extends from the support shaft 44 to the rear side (-X side). As shown in fig. 6, a hole 41a penetrating the arm 41 in the left-right direction is provided at the front end of the arm 41. The support shaft 44 penetrates the hole 41a in the left-right direction. The rear end of the arm 41 is located below the cam surface 37 a.

The claw portion 42 protrudes downward from the end of the rear side (-X side) of the arm portion 41. The contact portion 43 is provided on the upper side of the rear end portion of the arm portion 41. In the present embodiment, the contact portion 43 is a roller attached to the rear end portion of the arm portion 41. The contact portion 43 is rotatably attached to the arm portion 41 about a rotation axis extending in the left-right direction. The contact portion 43 contacts the cam surface 37a from the lower side.

The stopper member 40 moves in association with the movement of the movable portion 30. In the present embodiment, the stopper member 40 swings about the rotation axis J5 as the second movable member 32 rotates about the central axis J4. Thereby, the rear end portion of the stopper member 40 moves in the up-down direction as the second movable member 32 rotates about the center axis J4. In the present embodiment, since the stopper member 40 receives an elastic force toward one circumferential side by the torsion coil spring 45, the contact portion 43 provided at the rear-side end portion of the stopper member 40 receives a force toward the upper side from the torsion coil spring 45 and is pressed to the cam surface 37a from the lower side.

In the present embodiment, the parking gear 50 is located at the lower side of the stopper member 40. In more detail, the parking gear 50 is located at the lower side of the claw portion 42. In the present embodiment, the parking gear 50 is not located on the extension of the driven shaft 20. That is, in the present embodiment, the driven shaft 20 is located outside the area where the parking gear 50 is provided, as viewed from the left-right direction.

As shown in fig. 1, the parking gear 50 is fixed to, for example, the left end portion of the intermediate shaft 83 d. Therefore, in the present embodiment, the parking gear 50 is fixed to the second gear 83b via the intermediate shaft 83 d. The parking mechanism 10 is attached to the transmission mechanism portion 80b via the parking gear 50. The parking gear 50 is rotatable about the intermediate axis 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.

As shown in fig. 3 and 6, the parking gear 50 has a plurality of teeth 51 spaced around the intermediate axis J2. The claw portion 42 can be inserted between the tooth portions 51. Thereby, the claw portion 42 can engage with the parking gear 50.

As shown in fig. 4, the second elastic member 60 has a plate spring portion 61 and a roller 62. The plate spring portion 61 is plate-shaped with the plate surface facing in the up-down direction. The plate spring portion 61 extends in the front-rear direction. The front end of the plate spring portion 61 is fixed to the housing 85 by, for example, a screw 63. The portion of the leaf spring portion 61 located on the rear side is located on the lower side of the first movable member 31. The portion of the plate spring portion 61 located on the rear side can be elastically displaced in the up-down direction with the front end portion of the plate spring portion 61 fixed by the screw 63 as a fulcrum.

The leaf spring portion 61 has a base portion 61a and a pair of arm portions 61b, 61c. The base portion 61a is, for example, a front side portion of the plate spring portion 61. The base 61a is fixed to the housing 85 by, for example, screws 63. The pair of arm portions 61b, 61c extend rearward from the rear end portion of the base portion 61 a. The pair of arm portions 61b and 61c are arranged at a spacing in the left-right direction. The arm portion 61c is located on the right side of the arm portion 61 b. The position in the lateral direction between the pair of arm portions 61b, 61c in the lateral direction is the same as the position in the lateral direction of the outer edge portion 35c, for example. Between the pair of arm portions 61b, 61c in the left-right direction, for example, the outer edge portion 35c penetrates in the up-down direction.

The roller 62 is rotatable about a rotation axis extending in the left-right direction. The roller 62 is attached to the rear end of the plate spring portion 61. The roller 62 extends in the left-right direction. The roller 62 connects rear end portions of the pair of arm portions 61b, 61c to each other. The left end of the roller 62 is rotatably supported by the rear end of the arm 61 b. The right end of the roller 62 is rotatably supported by the rear end of the arm 61 c. The roller 62 is located below the outer edge portion 35 c. The roller 62 contacts the radially outer side surface of the outer edge portion 35 c.

The roller 62 can be fitted into the groove portion 35h, and can be hooked with respect to the groove portion 35h in the circumferential direction around the center axis J4. Thereby, the second elastic member 60 is hooked to the groove portion 35h in the circumferential direction around the center axis J4. In fig. 4, for example, a state in which the roller 62 is fitted into the first groove portion 35d and hooked in the circumferential direction is shown.

In fig. 3, the parking mechanism 10 is shown in an unlocked state that allows the axle 86 to rotate. In the unlocked state, the claw portions 42 of the stopper member 40 are in a state of being away from the parking gear 50 to the upper side, and the claw portions 42 are not located between the tooth portions 51. That is, in the unlocked state, the stopper member 40 is located at the non-parking position where the claw portion 42 is away from the parking gear. In this state, the parking gear 50 is rotatable about the intermediate axis J2, and each gear of the reduction gear 83 is rotatable. Accordingly, the rotation from the power unit 80a is transmitted to the axle 86 via the reduction gear 83 and the differential gear 84, so that the axle 86 can rotate. In the unlocked state, the roller 62 is hooked to the first groove portion 35d in the circumferential direction. That is, when the rotation angle of the driven shaft 20 is such that the stopper member 40 is at the non-parking position, the second elastic member is caught by the first groove portion 35d. In the unlocked state, the contact portion 43 of the stopper member 40 contacts the first cam portion 37 b.

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 portion 30 is also rotated in the other circumferential direction together with the driven shaft 20. When the second movable member 32 rotates in the other circumferential direction from the unlock state, as shown in fig. 6, the portion of the cam surface 37a that contacts the contact portion 43 changes from the first cam portion 37b to the second cam portion 37c. Since the second cam portion 37c is located radially outward of the first cam portion 37b, the contact portion 43 is pressed downward by the second cam portion 37c, so that the rear end portion of the stopper member 40 is moved downward. Thereby, the claw portions 42 enter between the tooth portions 51 of the parking gear 50 and mesh with the parking gear 50. That is, the position of the stopper member 40 becomes a parking position where the claw portion 42 is engaged with the parking gear 50.

If the claw portion 42 is engaged with the parking gear 50, the parking gear 50 is prevented from rotating about the intermediate axis J2. Accordingly, 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. Thus, the parking mechanism 10 is locked to prevent the rotation of the axle 86. In the locked state, the roller 62 is hooked to the second groove portion 35e in the circumferential direction. That is, when the rotation angle of the driven shaft 20 is such that the stopper member 40 is at the parking position, the second elastic member 60 is caught by the second groove portion 35e.

In the locked state, when the driven shaft 20 is rotated in the circumferential one-side direction (+θ direction) by the electric actuator 90, the movable portion 30 is also rotated in the circumferential one-side direction together with the driven shaft 20. When the second movable member 32 rotates in the circumferential direction from the locked state, the portion of the cam surface 37a that contacts the contact portion 43 changes from the second cam portion 37c to the first cam portion 37b. Thereby, the rear end portion of the stopper member 40 is moved upward by the elastic force of the coil spring 45, and the claw portions 42 are separated upward from each other from the tooth portions 51 of the parking gear 50. That is, the position of the stopper member 40 becomes the non-parking position where the claw portion 42 is away from the parking gear 50. Thereby, the parking mechanism 10 is again in the unlocked state.

As described above, the driven shaft 20 is rotated by the electric actuator 90, and the position of the stopper member 40 is switched between the parking position and the non-parking position in accordance with the movement of the movable portion 30. Thereby, the parking mechanism 10 is switched between the locked state and the unlocked state.

According to the present embodiment, the portion of the driven shaft 20 located on the left side with respect to the movable portion 30 is connected to an electric actuator 90 as a driving source for rotating the driven shaft 20. The driven shaft 20 has a first supported portion 24a located on the right side of the movable portion 30. Accordingly, the driven shaft 20 double-side supports the portions located on both sides of the movable portion 30 in the left-right direction by the electric actuator 90 and the portions supporting the first supported portion 24a, that is, the first hole portions 87b in the present embodiment. This allows the driven shaft 20 to be stably supported, as compared with the case where the driven shaft 20 is supported on one side. Therefore, even if a load is applied to the driven shaft 20, occurrence of a failure such as deformation of the driven shaft 20 can be suppressed. Therefore, occurrence of a failure in the operation of the parking mechanism 10 can be suppressed. Therefore, the reliability of the parking mechanism 10 can be improved.

In addition, for example, in the case where the parking mechanism 10 is switched from the unlocked state to the locked state, when the stopper member 40 approaches the parking gear 50, the claw portion 42 may come into contact with the tip end of the tooth portion 51 depending on the position of the tooth portion 51 of the parking gear 50. In this case, the stopper member 40 sometimes cannot be moved to a position where the claw portion 42 and the tooth portion 51 mesh with each other. In this case, the second movable member 32 that presses the stopper member 40 via the cam surface 37a may not be rotated to the predetermined position.

In contrast, according to the present embodiment, the movable portion 30 includes a first elastic member 33 that connects the first movable member 31 and the second movable member 32. Therefore, even when the second movable member 32 cannot rotate to the predetermined position, the first movable member 31 can be rotated to the predetermined position together with the driven shaft 20 by the elastic deformation of the first elastic member 33, and the second movable member 32 is allowed to be in a state of not being at the predetermined position. Thus, even when the claw portion 42 contacts the tip end of the tooth portion 51, the rotation of the first movable member 31 and the driven shaft 20 can be suppressed. Accordingly, the load applied to the electric actuator 90 that rotates the driven shaft 20 can be suppressed. In addition, the impact of the claw portion 42 coming into contact with the tip end of the tooth portion 51 can be suppressed from being transmitted to the first movable member 31 and the driven shaft 20. Therefore, damage to the first movable member 31 and the driven shaft 20 can be suppressed.

When the claw portion 42 contacts the tip end of the tooth portion 51, the elastic force in the direction moving from the first elastic member 33 to the predetermined position is applied to the second movable member 32 due to the elastic deformation of the first elastic member 33. Therefore, when the parking gear 50 rotates to shift the position of the tooth portion 51, the second movable member 32 moves to a predetermined position, and the claw portion 42 of the stopper member 40 is pressed between the tooth portions 51. Thereby, the claw portion 42 and the tooth portion 51 are engaged with each other, and the stopper member 40 is moved to the parking position.

In addition, according to the present embodiment, the first movable member 31 has the groove portion 35h to which the second elastic member 60 is hooked. Therefore, by hooking the second elastic member 60 to the groove portion 35h, the movement of the second elastic member 60 can be suppressed, and the driven shaft 20 can be suppressed from rotating about the center axis J4. Thus, for example, even when the power supply to the electric actuator 90 is turned off, 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, whereby the second elastic member 60 can be deviated from the groove portion 35h and the driven shaft 20 and the movable portion 30 can be rotated. Therefore, the state of the parking mechanism 10 can be switched.

Further, as described above, since the first movable member 31 and the second movable member 32 are coupled by the first elastic member 33, even when an impact is applied to the second movable member 32 via the stopper member 40 or the like, the impact can be absorbed by the first elastic member 33. This suppresses the transmission of the impact to the first movable member 31. Therefore, by providing the groove portion 35h to the first movable member 31 instead of the second movable member 32, even when an impact is applied to the second movable member 32, the movement of the first movable member 31 can be suppressed and the second elastic member 60 can be deviated from the groove portion 35 h. Therefore, the position of the driven shaft 20 can be more desirably maintained, and the state of the parking mechanism 10 can be more desirably maintained.

In addition, according to the present embodiment, the groove portion 35h includes: a first groove 35d in which the second elastic member 60 is caught when the rotation angle of the driven shaft 20 is such that the stopper member 40 is at the non-stop position; and a second groove 35e, wherein the second groove 35e allows the second elastic member 60 to be hooked when the rotation angle of the driven shaft 20 is the rotation angle for the stop member 40 to be at the parking position. Therefore, the second elastic member 60 is hooked to the first groove portion 35d, whereby the parking mechanism 10 can be maintained in the unlocked state. In addition, the second elastic member 60 is hooked to the second groove portion 35e, whereby the parking mechanism 10 can be maintained in the locked state.

In the present embodiment, when the outer edge portion 35c rotates, the plate spring portion 61 is elastically displaced downward by the radially outer side surface of the outer edge portion 35c, and the roller 62 is deviated from one of the first groove portion 35d and the second groove portion 35 e. If the other of the first groove portion 35d and the second groove portion 35e is moved to a position opposite to the roller 62, the roller 62 is fitted into the other of the first groove portion 35d and the second groove portion 35 e.

In addition, according to the present embodiment, the circumferential position of at least a part of the groove portion 35h around the center axis J4 is included in the circumferential position of the cam surface 37a around the center axis J4. Therefore, the outer edge portion 35c provided with the groove portion 35h and the cam flange portion 37 having the cam surface 37a are easily arranged in the same region in the housing 85 in a concentrated manner. As a result, the first movable member 31 and the second movable member 32 can be arranged in the housing 85 with a higher space efficiency than in the case where the areas where the outer edge portion 35c and the cam flange portion 37 are arranged are secured in the housing 85.

In addition, according to the present embodiment, the position of the fixed portion 34 in the left-right direction and the position of the outer edge portion 35c in the left-right direction are different from each other. Therefore, when the fixed portion 34 is fixed to the driven shaft 20, the outer edge portion 35c is less likely to become an obstacle. This makes it possible to easily perform the operation of fixing the fixed portion 34 to the driven shaft 20. In the present embodiment, the pin 38 can be easily inserted into the pin stopper holes 23a and 34 c.

In addition, according to the present embodiment, a part of the first elastic member 33 overlaps the outer edge portion 35c when viewed in the radial direction around the central axis J4. Therefore, a part of the first elastic member 33 can be arranged radially inward of the outer edge portion 35c, and the size of the first elastic member 33 in the lateral direction can be easily increased. This makes it easy to optimize the elastic modulus of the first elastic member 33.

In addition, according to the present embodiment, the driven shaft 20 is located outside the area where the parking gear 50 is provided, as viewed from the left-right direction. That is, the parking gear 50 is not located on the extension of the driven shaft 20. Therefore, a space for supporting the first supported portion 24a is easily secured in the housing 85 on the right side of the driven shaft 20. In the present embodiment, the first hole 87b is easily provided on the right side of the driven shaft 20.

Further, according to the present embodiment, the driven shaft 20 has the second supported portion 22b, and the second supported portion 22b is located between a portion of the driven shaft 20 connected to the electric actuator 90 as a driving source and the left-right direction of the movable portion 30. Therefore, the driven shaft 20 can be supported more stably. Therefore, even if a load is applied to the driven shaft 20, occurrence of a failure such as deformation of the driven shaft 20 can be further suppressed. Therefore, the reliability of the parking mechanism 10 can be further improved.

In the present embodiment, the oil O lifted by the ring gear 84a is supplied between the first supported portion 24a and the first hole 87b and between the second supported portion 22b and the second hole 88d. Therefore, the oil O functions as lubricating oil, and friction between the outer peripheral surface of each supported portion and the inner peripheral surface of each hole portion can be reduced. Thus, each supported portion can be rotatably supported by each hole.

In addition, according to the present embodiment, the housing 85 has a first hole 87b into which the first supported portion 24a is inserted, and a second hole 88d into which the second supported portion 22b is inserted. Therefore, the driven shaft 20 can be rotatably supported by the first hole 87b and the second hole 88d. As a result, the number of components of the drive device 100 can be reduced as compared with a case where a bearing for supporting the driven shaft 20 is separately provided to the housing 85.

In addition, according to the present embodiment, the housing 85 includes a first housing member 87 having a first hole portion 87b, and a second housing member 88 having a second hole portion 88d. Thus, for example, the following assembly method can be employed: one supported portion is supported by one hole portion before the first and second housing members 87 and 88 are fixed, and the other supported portion is supported by the other hole portion while the first and second housing members 87 and 88 are fixed. Thus, the driving device 100 can be assembled more easily than, for example, the case where the first hole 87b and the second hole 88d are provided in the same member.

In addition, according to the present embodiment, the parking gear 50 is fixed to the second gear 83b. Therefore, compared with the case where, for example, the parking gear 50 is fixed to the first gear 83a, the parking mechanism 10 can be disposed apart from the extension line of the power shaft 81 a. Thus, the parking mechanism 10 can be easily disposed in the housing 85.

The present invention is not limited to the above-described embodiments, and other configurations and other methods may be adopted within the scope of the technical idea 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 orthogonal to the rotation axis of the parking gear. For example, in the above embodiment, the center axis J4 and the driven shaft 20 may extend in the up-down direction.

The portion for supporting the first supported portion and the portion for supporting the second supported portion may have any structure as long as each supported portion can be rotatably supported. The portion for supporting the first supported portion and the portion for supporting the second supported portion may be cylindrical sliding bearing members or rolling bearing members such as ball bearings. In this case, each bearing member is held by the housing, for example. The portion for supporting the first supported portion and the portion for supporting the second supported portion may be provided in the same single member.

For example, in the case where the driven shaft 20 of the above embodiment extends in the vertical direction, the first hole 87b for supporting the first supported portion 24a and the second hole 88d for supporting the second supported portion 22b may be provided in the second housing member 88. In this case, the coupled portion 21 may protrude upward from the second housing member 88. In this case, the wall portion for providing the first hole 87b may protrude rightward from the left side wall portion 88 a. The second supported portion may not be provided.

The movable portion may have any structure as long as it moves in accordance with the rotation of the driven shaft. The movable part may also be a single member. The movable portion may be configured to linearly move in a certain direction as a whole without rotating. The movable portion may have any structure, as long as the portion contacting the stopper member moves the stopper member, instead of the cam surface. In the case where the movable portion has the first movable member and the second movable member, the first movable member and the second movable member may be disposed at any relative positions. The moving direction of the first movable member and the moving direction of the second movable member may also be different from each other. In the above embodiment, the second movable member 32 may be disposed on the left side of the first movable member 31, that is, on the side closer to the coupled portion 21.

The stopper member may be moved in any manner as long as it moves in association with the movement of the movable portion. The stopper member may be configured to move linearly in a certain direction as a whole without swinging. The groove portion to which the second elastic member is hooked may be provided in the second movable member. The groove may be provided only in one or three or more grooves. The groove may not be provided. The parking gear may be mounted at any position of the transmission mechanism.

The power unit may not be an electric motor. The power unit may be an engine, for example. The structure of the transmission mechanism is not particularly limited. The above-described structures and methods described in the present specification can be appropriately combined within a range not contradicting each other.

Claims (10)

1. A parking mechanism, comprising:

a driven shaft rotatable about a central axis extending in a predetermined direction;

a movable portion that moves in accordance with rotation of the driven shaft;

a stopper member that has a claw portion and moves in association with movement of the movable portion; and

a parking gear which is capable of meshing with the claw portion,

with the movement of the movable portion, the position of the stopper member is switched to a parking position where the claw portion is engaged with the parking gear and a non-parking position where the claw portion is away from the parking gear,

A portion of the driven shaft located on one side of the predetermined direction with respect to the movable portion is connected to a drive source that rotates the driven shaft,

the driven shaft has a first supported portion supported rotatably about the central axis,

the first supported portion is located on the other side of the predetermined direction with respect to the movable portion,

the movable part has:

a first movable member fixed to the driven shaft;

a second movable member that is in contact with the stopper member and is relatively movable with respect to the first movable member; and

a first elastic member that connects the first movable member and the second movable member,

the parking mechanism further includes a second elastic member,

the first movable member has a groove portion for hooking the second elastic member,

the first movable member has:

a fixed portion fixed to the driven shaft; and

an outer edge portion that is located outside the fixed portion in a radial direction around the central axis and is provided with the groove portion,

The position of the fixed portion in the predetermined direction and the position of the outer edge portion in the predetermined direction are different from each other.

2. A parking mechanism as claimed in claim 1, wherein,

the groove portion includes:

a first groove portion that allows the second elastic member to be hooked when the rotation angle of the driven shaft is such that the stopper member is in the non-parking position; and

and a second groove portion in which the second elastic member is caught when the rotation angle of the driven shaft is such that the stopper member is at the parking position.

3. A parking mechanism as claimed in claim 1 or 2, wherein,

the second movable member has:

a through hole through which the driven shaft passes in the predetermined direction; and

a cam surface in contact with the stop member,

and the second movable member is relatively rotatable about the central axis with respect to the first movable member,

a circumferential position of at least a portion of the groove portion about the central axis is contained in a circumferential position of the cam surface about the central axis.

4. A parking mechanism as claimed in claim 1 or 2, wherein,

the first movable member and the second movable member are arranged with a space therebetween in the predetermined direction,

the first elastic member is a coil spring extending in the predetermined direction and surrounding the driven shaft, and is located between the predetermined directions of the first movable member and the second movable member,

the position in the predetermined direction of the fixed portion is a position away from the second movable member in the predetermined direction with respect to the position in the predetermined direction of the outer edge portion,

a part of the first elastic member overlaps the outer edge portion when viewed in a radial direction centered on the central axis.

5. A parking mechanism as claimed in claim 1 or 2, wherein,

the driven shaft is located outside a region where the parking gear is provided, as viewed in the predetermined direction.

6. A parking mechanism as claimed in claim 1 or 2, wherein,

the driven shaft has a second supported portion supported rotatably about the central axis,

the second supported portion is located between a portion of the driven shaft connected to the driving source and the predetermined direction of the movable portion.

7. A driving device mounted on a vehicle, comprising:

a power unit that drives the driving device;

a transmission mechanism portion connected to the power portion;

the parking mechanism according to claim 6 attached to the transmission mechanism unit; and

a housing that houses the power unit, the transmission mechanism unit, and the parking mechanism inside,

the housing has:

a first hole portion into which the first supported portion is inserted; and

and a second hole portion into which the second supported portion is inserted.

8. The driving device as recited in claim 7, wherein,

the housing has:

a first housing member having the first hole portion; and

a second housing member having the second hole portion and fixed to the first housing member.

9. A driving device mounted on a vehicle, comprising:

a power unit that drives the driving device;

a transmission mechanism portion connected to the power portion; and

The parking mechanism according to any one of claims 1 to 6 attached to the transmission mechanism section.

10. Drive device according to any one of claims 7 to 9, wherein,

the transmission mechanism section includes:

a first gear fixed to the power portion; and

a second gear meshed with the first gear,

the parking gear is fixed to the second gear.