JP2023136046A - Engagement device and vehicle drive device equipped with the same - Google Patents

Abstract

To provide a technology which can reduce a size of an engagement device.SOLUTION: A first support part 34 for supporting a first friction engagement element 31 is arranged at a first member 1 or a member which is non-rotatably supported by the first member 1, and a second support part 35 for supporting a second friction engagement element 32 is arranged at a second member 2 so as to be located outside in a radial direction R with respect to the first support part 34. The first member 1 comprises a first radial-direction extension part 11 arranged at a second side L2 in an axial direction with respect to the friction engagement elements 31, 32, and extending along the radial direction R. The first radial-direction extension part 11 comprises: a regulation part 111 for regulating the movement of the friction engagement elements 31, 32 to the second side L2 in the axial direction; and an axial-direction support part 112 arranged inside the radial direction R with respect to the regulation part 111, and supporting a linear motion conversion mechanism 42 in an axial direction L. The linear motion conversion mechanism 42 is arranged at a position overlapped with the friction engagement elements 31, 32 in a radial-direction view and inside the radial direction R with respect to the friction engagement elements 31, 32.SELECTED DRAWING: Figure 1

Description

The present invention provides an engagement device that includes an engagement mechanism that selectively engages a first member and a second member, and a drive device that drives the engagement mechanism, and a vehicle drive that includes the engagement device. Regarding equipment.

An example of such technology is disclosed in Patent Document 1 below. Hereinafter, in the description of the background art, the reference numerals in Patent Document 1 will be cited in parentheses.

The engagement device of Patent Document 1 includes an engagement mechanism (18) that selectively engages a second member, which rotates integrally with a rotor (23) of a rotating electric machine (13), with a case serving as a first member. ) and a drive device that drives the engagement mechanism.

The engagement mechanism (18) is arranged to face the first frictional engagement element (66b) in the axial direction (the left-right direction in FIGS. 1 and 2 of Patent Document 1). The second frictional engagement element (66a) is provided with a second frictional engagement element (66a), and a pressing member (68) that presses the second frictional engagement element (66a) in the axial direction.

The first frictional engagement element (66b) is supported so as to be non-rotatable and movable in the axial direction with respect to the case as the first member. Further, the second friction engagement element (66a) is supported so as to be non-rotatable and movable in the axial direction with respect to a second member that rotates integrally with the rotor (23).

The drive device includes a drive source (80) and a linear motion conversion mechanism (69) that converts the rotational drive force of the drive source into axial drive force and transmits it to the pressing member (68).

JP 2019-100527 Publication

In the engagement device of Patent Document 1, the case as the first member is arranged separately on both sides in the axial direction with respect to the first frictional engagement element (66b) and the second frictional engagement element (66a). It includes a first wall (79) and a second wall (26).

The first wall portion (79) is formed to support the linear motion conversion mechanism (69) from one side in the axial direction (the right side in FIGS. 1 and 2 of Patent Document 1). The second wall portion (26) supports the first frictional engagement element (66b) and the second frictional engagement element (66a) pressed by the pressing member (68) on the other side in the axial direction (see the figure in Patent Document 1). It is formed to be supported from the left side in 1 and 2).

In such a configuration, the force applied when the pressing member (68) presses the first frictional engagement element (66b) and the second frictional engagement element (66a) causes the first wall portion (79) of the case to and the second wall portion (26) are likely to deform so as to separate from each other in the axial direction. In order to suppress such deformation, it is necessary to increase the rigidity of the case. However, in the configuration in which the first wall (79) and the second wall (26) of the case are arranged apart from each other in the axial direction as described above, it is necessary to increase the rigidity over a wide range of the case. There is a problem in that the case becomes larger and, by extension, the engagement device becomes larger.

Therefore, it is desired to realize a technology that can reduce the size of the engagement device.

In view of the above, the characteristic configuration of the engagement device is as follows:
a first member;
a second member rotatably supported relative to the first member;
an engagement mechanism that selectively engages the first member and the second member;
An engagement device comprising: a drive device that drives the engagement mechanism;
The direction along the rotation axis of the second member is defined as an axial direction, one side in the axial direction is defined as a first axial side, and the other side in the axial direction is defined as a second axial side, which is orthogonal to the axial direction. The direction is the radial direction,
The engagement mechanism includes a first frictional engagement element, a second frictional engagement element arranged to face the first frictional engagement element in the axial direction, and the first frictional engagement element. and a pressing member that presses the second frictional engagement element from the first side in the axial direction, a first support part that supports the first frictional engagement element, and a second support part that supports the second frictional engagement element. comprising a support part;
The pressing member is supported to be non-rotatable with respect to the first member and movable in the axial direction,
Each of the first support part and the second support part is formed in a cylindrical shape along the axial direction,
The first support portion is provided on the first member or a member non-rotatably supported with respect to the first member,
The second support part is provided on the second member so as to be located on the outside in the radial direction with respect to the first support part,
The first friction engagement element is supported so as to be non-rotatable and movable in the axial direction with respect to the first support part,
The second frictional engagement element is supported so as to be non-rotatable and movable in the axial direction with respect to the second support part,
The drive device includes a drive source and a linear motion conversion mechanism that converts the rotational drive force of the drive source into the axial drive force and transmits it to the pressing member,
The first member includes a first radially extending portion disposed on the second axial side with respect to the first frictional engagement element and the second frictional engagement element and extending along the radial direction. Equipped with
The first radially extending portion includes a restriction portion that restricts movement of the first frictional engagement element and the second frictional engagement element toward the second side in the axial direction, and a an axial support part that is disposed inside the direction and supports the linear motion conversion mechanism in the axial direction,
The linear motion conversion mechanism is located inside the first frictional engagement element and the second frictional engagement element in the radial direction, and the first frictional engagement element is located inside the first frictional engagement element and the second frictional engagement element when viewed in a radial direction along the radial direction. and arranged at a position overlapping with the second frictional engagement element,
The pressing member presses the first frictional engagement element and the second frictional engagement element from the first side in the axial direction, and the restriction part presses the first frictional engagement element and the second frictional engagement element. By supporting from the second side in the axial direction, the engaging mechanism is brought into an engaged state.

According to this characteristic configuration, when the pressing member presses the first frictional engagement element and the second frictional engagement element from the first side in the axial direction, the regulating portion is configured to control the first frictional engagement element and the second frictional engagement element. The mating element is supported from the second axial side. Further, the axial support portion supports an axial load that acts on the linear motion conversion mechanism when the pressing member presses the first frictional engagement element and the second frictional engagement element from the first axial side. The restriction portion and the axial support portion are provided in the first radially extending portion, that is, the same portion of the first member. As a result, by simply increasing the rigidity of the first radially extending portion, the deformation of the first member due to the force that is applied when the pressing member presses the first frictional engagement element and the second frictional engagement element is suppressed to a minimum. be able to. Therefore, it is easy to downsize the first member.
Further, according to the present characteristic configuration, the linear motion conversion mechanism is located inside the first frictional engagement element and the second frictional engagement element in the radial direction, and is located at the first frictional It is arranged at a position overlapping with the engagement element and the second frictional engagement element. As a result, the axial dimension of the engagement device can be kept small compared to a configuration in which the linear motion conversion mechanism is arranged so as not to overlap with the first frictional engagement element and the second frictional engagement element when viewed in the radial direction. I can do it.
As described above, according to this characteristic configuration, it is possible to downsize the engagement device.

A cross-sectional view along the axial direction of the engagement device according to the first embodiment A cross-sectional view along the axial direction of the engagement device according to the second embodiment A cross-sectional view along the axial direction of the vehicle drive device according to the first embodiment Skeleton diagram of the vehicle drive device according to the first embodiment A cross-sectional view along the axial direction of a vehicle drive device according to a second embodiment Skeleton diagram of a vehicle drive device according to a second embodiment

1. Engagement Device According to First Embodiment Below, an engagement device 10 according to a first embodiment will be described with reference to FIG. 1. As shown in FIG. 1, the engagement device 10 includes a first member 1, a second member 2 supported relatively rotatably with respect to the first member 1, and an engagement device that selectively engages them. It includes a mechanism 3 and a drive device 4 that drives the engagement mechanism 3.

In the following description, the direction along the rotational axis of the second member 2 will be referred to as the "axial direction L." One side in the axial direction L is defined as the "first axial side L1", and the other side in the axial direction L is defined as the "second axial side L2". Further, a direction perpendicular to the axial direction L is referred to as a "radial direction R." The radial direction R is defined with each rotational axis of the rotating member such as the second member 2 as a reference. Note that when there is no need to distinguish which rotational axis is used as a reference or when it is clear which rotational axis is used as a reference, it may be simply written as "radial direction R."

The engagement mechanism 3 includes a first frictional engagement element 31, a second frictional engagement element 32 arranged to face the first frictional engagement element 31 in the axial direction L, and It includes a pressing member 33 that presses from the first side L1, a first support part 34 that supports the first frictional engagement element 31, and a second support part 35 that supports the second frictional engagement element 32. .

The drive device 4 includes a drive source 41 and a linear motion conversion mechanism 42 that converts the rotational drive force of the drive source 41 into a drive force in the axial direction L and transmits the drive force to the pressing member 33.

In this embodiment, a plurality of first frictional engagement elements 31 and a plurality of second frictional engagement elements 32 are provided, and these are arranged alternately along the axial direction L. One of the first frictional engagement element 31 and the second frictional engagement element 32 may be a friction plate, and the other may be a separate plate.

Each of the first support part 34 and the second support part 35 is formed in a cylindrical shape along the axial direction L. The second support portion 35 is disposed outside the first support portion 34 in the radial direction R.

The first support portion 34 supports the first frictional engagement element 31 from inside in the radial direction R. The first friction engagement element 31 is supported so as to be non-rotatable and movable in the axial direction L relative to the first support portion 34 . In this example, a plurality of spline teeth extending in the axial direction L are formed on the inner peripheral portion of the first frictional engagement element 31 so as to be distributed in the circumferential direction. A plurality of spline teeth that engage with a plurality of spline teeth formed on the inner circumference of the first frictional engagement element 31 are arranged on the outer circumference of the first support portion 34 so as to extend in the axial direction L. They are distributed in the circumferential direction.

The second support portion 35 supports the second frictional engagement element 32 from the outside in the radial direction R. The second friction engagement element 32 is supported so as to be non-rotatable and movable in the axial direction L relative to the second support portion 35 . In this example, a plurality of spline teeth extending in the axial direction L are formed on the outer peripheral portion of the second frictional engagement element 32 and distributed in the circumferential direction. A plurality of spline teeth that engage with a plurality of spline teeth formed on the outer circumference of the second frictional engagement element 32 are provided on the inner peripheral portion of the second support portion 35 so as to extend in the axial direction L. They are distributed in the circumferential direction.

The first member 1 includes a first radially extending portion 11 . The first radially extending portion 11 is arranged on the second axial side L2 with respect to the first frictional engagement element 31 and the second frictional engagement element 32. The first radially extending portion 11 is formed to extend along the radial direction R. In this embodiment, the first radially extending portion 11 is formed in the shape of an annular plate extending along the radial direction R with respect to the rotation axis of the second member 2 .

The first radially extending portion 11 includes a restricting portion 111 and an axial support portion 112 . The restricting portion 111 is configured to restrict movement of the first frictional engagement element 31 and the second frictional engagement element 32 toward the second axial side L2. The axial support portion 112 is arranged inside the restriction portion 111 in the radial direction R. The axial support portion 112 is configured to support the linear motion conversion mechanism 42 in the axial direction L.

In this embodiment, the first member 1 further includes a second radially extending portion 12 and a connecting portion 13 . The second radially extending portion 12 is arranged on the first axial side L1 with respect to the pressing member 33. The second radially extending portion 12 is formed to extend along the radial direction R. The connecting portion 13 is disposed on the outside of the second support portion 35 in the radial direction R. The connecting portion 13 extends along the axial direction L so as to connect the first radially extending portion 11 and the second radially extending portion 12.

In this embodiment, the second radially extending portion 12 is formed in an annular plate shape extending along the radial direction R with respect to the rotation axis of the second member 2. Further, the connecting portion 13 is formed in a cylindrical shape that covers the outside of the second support portion 35 in the radial direction R. In the illustrated example, the first radially extending portion 11 is formed integrally with the connecting portion 13 so as to cover the opening on the second axial side L2 of the connecting portion 13. Further, the second radially extending portion 12 is joined to the connecting portion 13 so as to cover the opening on the first axial side L1 of the connecting portion 13.

Moreover, in this embodiment, the first member 1 is a non-rotating member NR. In this example, the first member 1 is a case that accommodates the second member 2, the engagement mechanism 3, and the drive device 4.

The first support portion 34 is provided on the first member 1 or a member that is non-rotatably supported with respect to the first member 1. In this embodiment, the first support section 34 is provided on the first member 1. In the illustrated example, the first support portion 34 is integrated with the restriction portion 111 so as to extend from the restriction portion 111 of the first radially extending portion 11 of the first member 1 toward the first axial side L1. It is formed as follows. On the other hand, the second support portion 35 is provided on the second member 2.

In this embodiment, the linear motion conversion mechanism 42 includes a screw shaft member 421 and a nut member 422.

The screw shaft member 421 is formed to extend along the axial direction L. In this embodiment, the screw shaft member 421 is arranged coaxially with the second member 2. Moreover, in this embodiment, the screw shaft member 421 is arranged so as to penetrate the first member 1 in the axial direction L.

Further, the screw shaft member 421 is arranged inside the first frictional engagement element 31 and the second frictional engagement element 32 in the radial direction R. Further, the screw shaft member 421 is arranged at a position overlapping the first frictional engagement element 31 and the second frictional engagement element 32 when viewed in the radial direction R. In this way, the linear motion conversion mechanism 42 is located inside the first frictional engagement element 31 and the second frictional engagement element 32 in the radial direction R, and has the first frictional force when viewed in the radial direction along the radial direction R. It is arranged at a position overlapping with the engagement element 31 and the second frictional engagement element 32. Here, regarding the arrangement of two elements, "overlapping when viewed in a specific direction" means that when a virtual straight line parallel to the line of sight is moved in each direction orthogonal to the virtual straight line, the virtual straight line becomes two Refers to the existence of at least a part of the area that intersects both of the two elements.

In this embodiment, the screw shaft member 421 includes a threaded portion 421a and a cylindrical portion 421b. A male thread is formed on the outer periphery of the threaded portion 421a. The cylindrical portion 421b is formed in a cylindrical shape along the axial direction L. In this embodiment, the cylindrical portion 421b is arranged on the second axial side L2 with respect to the threaded portion 421a.

The nut member 422 is configured to be screwed into the threaded portion 421a of the screw shaft member 421. Specifically, the inner peripheral portion of the nut member 422 is formed with a female thread that is screwed into the male thread of the threaded portion 421a. Therefore, as the screw shaft member 421 rotates, the nut member 422 performs a linear motion along the axial direction L according to the rotation direction and the directions of the male thread and the female thread.

The nut member 422 is supported so as to be non-rotatable with respect to the first member 1 and movable in the axial direction L. In this embodiment, the nut member 422 is arranged inside the first support portion 34 in the radial direction R. The nut member 422 is non-rotatable with respect to the first support part 34 via an annular connecting member 42a disposed between the nut member 422 and the first support part 34 in the radial direction R. They are connected so as to be movable in the axial direction L. In the illustrated example, a plurality of spline teeth extending in the axial direction L are formed on the outer peripheral portion of the nut member 422 and are distributed in the circumferential direction. A plurality of spline teeth that engage with a plurality of spline teeth formed on the outer circumference of the nut member 422 are distributed in the circumferential direction on the inner circumference of the connecting member 42a so as to extend in the axial direction L. It is formed by Furthermore, a plurality of spline teeth extending in the axial direction L are formed on the inner circumferential portion of the first support portion 34 and are dispersed in the circumferential direction. A plurality of spline teeth that engage with a plurality of spline teeth formed on the inner circumference of the first support portion 34 are arranged on the outer circumference of the connecting member 42a in the circumferential direction so as to extend in the axial direction L. It is formed in a dispersed manner.

Further, the nut member 422 is connected to the pressing member 33 so as to move integrally in the axial direction L. In the illustrated example, the nut member 422 is formed integrally with the pressing member 33. Therefore, as the screw shaft member 421 rotates, the pressing member 33 moves in the axial direction L via the nut member 422. In this way, the pressing member 33 is supported so as to be non-rotatable with respect to the first member 1 and movable in the axial direction L.

In this embodiment, the linear motion conversion mechanism 42 further includes a supported portion 423. The supported portion 423 is supported by the axial support portion 112 of the first radially extending portion 11 of the first member 1 from the first axial side L1. The supported part 423 is rotatably supported by the axial support part 112. In this embodiment, the supported portion 423 is supported by the axial support portion 112 from the first axial side L1 via the first bearing B1. The first bearing B1 is a thrust bearing that rotatably supports the supported part 423 with respect to the axial support part 112. Further, in this embodiment, the supported portion 423 is connected to the cylindrical portion 421b of the screw shaft member 421. In the illustrated example, the supported portion 423 is formed to protrude outward in the radial direction R from the cylindrical portion 421b.

When the pressing member 33 moves to the second axial side L2 and presses the first frictional engagement element 31 and the second frictional engagement element 32, the restriction portion of the first radially extending portion 11 in the first member 1 111 restricts movement of the first frictional engagement element 31 and the second frictional engagement element 32 toward the second axial side L2. That is, the regulating portion 111 supports the first frictional engagement element 31 and the second frictional engagement element 32 pressed by the pressing member 33 from the second axial side L2. As a result, the first frictional engagement element 31 and the second frictional engagement element 32 are coupled to each other so that they cannot rotate relative to each other, and the engagement mechanism 3 is brought into an engaged state. As described above, in this embodiment, the first member 1 provided with the first support portion 34 that supports the first frictional engagement element 31 is the non-rotating member NR. Therefore, when the engagement mechanism 3 is in the engaged state, the second member 2 provided with the second support portion 35 that supports the second frictional engagement element 32 becomes unrotatable.

On the other hand, when the pressing member 33 moves to the first side L1 in the axial direction and the pressing of the first frictional engagement element 31 and the second frictional engagement element 32 by the pressing member 33 is released, the first frictional engagement element 31 and the second frictional engagement element 32 are in a state where they can rotate relative to each other, and the engagement mechanism 3 is in a released state.

As described above, the engagement device 10 is
a first member 1;
a second member 2 rotatably supported relative to the first member 1;
an engagement mechanism 3 that selectively engages the first member 1 and the second member 2;
An engagement device 10 comprising a drive device 4 that drives an engagement mechanism 3,
The engagement mechanism 3 includes a first frictional engagement element 31, a second frictional engagement element 32 arranged to face the first frictional engagement element 31 in the axial direction L, and a first frictional engagement element 32. A pressing member 33 that presses the mating element 31 and the second frictional engagement element 32 from the first axial side L1, a first support part 34 that supports the first frictional engagement element 31, and a second frictional engagement element 32. a second support part 35 that supports the
The pressing member 33 is supported so as to be non-rotatable with respect to the first member 1 and movable in the axial direction L,
Each of the first support part 34 and the second support part 35 is formed in a cylindrical shape along the axial direction L,
The first support part 34 is provided on the first member 1 or a member non-rotatably supported with respect to the first member 1,
The second support part 35 is provided on the second member 2 so as to be located outside in the radial direction R with respect to the first support part 34,
The first friction engagement element 31 is supported so as to be non-rotatable and movable in the axial direction L with respect to the first support part 34,
The second frictional engagement element 32 is supported non-rotatably and movably in the axial direction L with respect to the second support portion 35,
The drive device 4 includes a drive source 41 and a linear motion conversion mechanism 42 that converts the rotational drive force of the drive source 41 into a drive force in the axial direction L and transmits it to the pressing member 33,
The first member 1 includes a first radially extending portion disposed on the second axial side L2 with respect to the first frictional engagement element 31 and the second frictional engagement element 32 and extending along the radial direction R. Equipped with 11,
The first radially extending portion 11 includes a restriction portion 111 that restricts movement of the first frictional engagement element 31 and the second frictional engagement element 32 toward the second axial side L2, and a restriction portion 111 that an axial support part 112 that is disposed inside the radial direction R and supports the linear motion conversion mechanism 42 in the axial direction L;
The linear motion conversion mechanism 42 is located inside the first frictional engagement element 31 and the second frictional engagement element 32 in the radial direction R, and is located inside the first frictional engagement element 31 when viewed in the radial direction along the radial direction R. and arranged at a position overlapping with the second frictional engagement element 32,
The pressing member 33 presses the first frictional engagement element 31 and the second frictional engagement element 32 from the first axial side L1, and the regulating part 111 presses the first frictional engagement element 31 and the second frictional engagement element 32. By supporting from the second axial side L2, the engagement mechanism 3 enters the engaged state.

According to this configuration, when the pressing member 33 presses the first frictional engagement element 31 and the second frictional engagement element 32 from the first side L1 in the axial direction, the restriction portion 111 and supports the second frictional engagement element 32 from the second axial side L2. The axial support portion 112 also supports the axial direction that acts on the linear motion conversion mechanism 42 when the pressing member 33 presses the first frictional engagement element 31 and the second frictional engagement element 32 from the first axial side L1. Supports a load of L. The regulating portion 111 and the axial support portion 112 are provided in the first radially extending portion 11 , that is, in the same portion of the first member 1 . Thereby, by simply increasing the rigidity of the first radially extending portion 11, the force acting when the pressing member 33 presses the first frictional engagement element 31 and the second frictional engagement element 32 can deformation can be kept small. Therefore, it is easy to downsize the first member 1.
Further, according to this configuration, the linear motion conversion mechanism 42 is located inside the first frictional engagement element 31 and the second frictional engagement element 32 in the radial direction R, and is located inside the first frictional engagement element 31 and the second frictional engagement element 32 when viewed in the radial direction along the radial direction R. The first frictional engagement element 31 and the second frictional engagement element 32 are arranged at a position overlapping each other. As a result, compared to a configuration in which the linear motion conversion mechanism 42 is arranged so as not to overlap with the first frictional engagement element 31 and the second frictional engagement element 32 when viewed in the radial direction, the axial direction L of the engagement device 10 is Dimensions can be kept small.
As described above, according to this configuration, it is possible to downsize the engagement device 10.

In this embodiment, the regulating portion 111 includes a first support surface 111a facing the first axial side L1. The first support surface 111a is arranged at a position overlapping the first frictional engagement element 31 and the second frictional engagement element 32 when viewed in the axial direction along the axial direction L.

Further, in this embodiment, the axial support portion 112 includes a second support surface 112a facing the second axial side L2. The second support surface 112a is arranged at a position overlapping the supported portion 423 of the linear motion conversion mechanism 42 when viewed in the axial direction along the axial direction L. In this embodiment, the first bearing B1 is arranged between the second support surface 112a and the surface of the supported part 423 facing the first axial side L1 in the axial direction L.

Further, in the present embodiment, the supported portion 423 of the linear motion conversion mechanism 42 overlaps with the restriction portion 111 of the first radially extending portion 11 of the first member 1 when viewed in the radial direction R. It is located in In the illustrated example, the axial support portion 112 is disposed on the first axial side L1 with respect to the restriction portion 111. The supported portion 423 is arranged in a region surrounded by the inner circumferential surface of the regulating portion 111 and the second support surface 112a of the axial support portion 112. Here, the axial support portion 112 is arranged at a position overlapping the first frictional engagement element 31 and the second frictional engagement element 32 when viewed in the radial direction along the radial direction R.

As described above, in the present embodiment, the linear motion conversion mechanism 42 includes the supported part 423 supported by the axial support part 112 from the first axial side L1,
The regulating portion 111 includes a first support surface 111a facing the first axial side L1 at a position overlapping the first frictional engagement element 31 and the second frictional engagement element 32 when viewed in the axial direction along the axial direction L. ,
The axial support portion 112 includes a second support surface 112a facing the second axial side L2 at a position overlapping the supported portion 423 when viewed in the axial direction along the axial direction L,
The supported portion 423 is arranged so as to overlap the regulating portion 111 when viewed in the radial direction along the radial direction R.

According to this configuration, the dimension of the engagement device 10 in the axial direction L can be kept small compared to a configuration in which the supported portion 423 is arranged so as not to overlap the restriction portion 111 when viewed in the radial direction.
Further, according to this configuration, the first support surface 111a of the regulating portion 111 can appropriately support the first frictional engagement element 31 and the second frictional engagement element 32 from the second axial side L2. Furthermore, the second support surface 112a of the axial support portion 112 can appropriately support the supported portion 423 of the linear motion conversion mechanism 42 from the first axial side L1.

In this embodiment, the second member 2 includes a third radially extending portion 21 and a shaft portion 22 . The third radially extending portion 21 is arranged between the second radially extending portion 12 of the first member 1 and the pressing member 33 in the axial direction L. The third radially extending portion 21 is formed to extend inward in the radial direction R from the second support portion 35 . The shaft-shaped portion 22 is arranged inside the second radially extending portion 12 of the first member 1 in the radial direction R. The shaft portion 22 is formed to extend from the third radially extending portion 21 toward the first axial side L1. In this embodiment, the second bearing B2 is disposed between the inner circumferential surface of the second radially extending portion 12 and the outer circumferential surface of the shaft-shaped portion 22. The second bearing B2 is a "support bearing" for rotatably supporting the shaft-like part 22 with respect to the second radially extending part 12.

Thus, in the present embodiment, the first member 1 includes the second radially extending portion 12 that is disposed on the first axial side L1 with respect to the pressing member 33 and extends along the radial direction R; A connection that is disposed outside the second support portion 35 in the radial direction R and extends along the axial direction L to connect the first radially extending portion 11 and the second radially extending portion 12. A non-rotating member NR further comprising a portion 13;
The second member 2 is disposed between the second radially extending portion 12 and the pressing member 33 in the axial direction L, and extends in a third radial direction from the second support portion 35 toward the inside in the radial direction R. an extending portion 21; and a shaft-shaped portion that is disposed inside the second radial extending portion 12 in the radial direction R and extends from the third radially extending portion 21 toward the first axial side L1. 22 and,
Support for rotatably supporting the shaft-like part 22 with respect to the second radially-extending part 12 between the inner peripheral surface of the second radially extending part 12 and the outer peripheral surface of the shaft-like part 22 A second bearing B2 as a bearing is arranged.

According to this configuration, the second bearing B2 serving as the support bearing is supported by the second radially extending portion 12 of the first member 1 serving as the non-rotating member NR. Here, as described above, when the pressing member 33 presses the first frictional engagement element 31 and the second frictional engagement element 32, the first radially extending portion 11 of the first member 1 The frictional engagement element 31, the second frictional engagement element 32, and the linear motion conversion mechanism 42 are supported. Therefore, in the second radially extending part 12 connected to the first radially extending part 11 via the connecting part 13, the pressing member 33 is attached to the first frictional engagement element 31 and the second frictional engagement element 32. It is difficult to apply force when pressing. Therefore, it is possible to avoid displacement or inclination of the second bearing B2 as a support bearing supported by the second radially extending portion 12. Further, the need to ensure high rigidity of the second radially extending portion 12 is reduced. Therefore, it is easy to downsize the first member 1, and by extension, it is easy to downsize the engagement device 10.

In this embodiment, the third radially extending portion 21 is formed in the shape of an annular plate extending along the radial direction R with respect to the rotation axis of the second member 2 . The outer end of the third radially extending portion 21 in the radial direction R is connected to the end of the second support portion 35 on the first axial side L1, and the third radially extending portion 21 has an outer end in the radial direction R. The inner end in the direction R is connected to the end of the shaft-shaped portion 22 on the second axial side L2. In the illustrated example, the third radially extending portion 21, the shaft portion 22, and the second support portion 35 are integrally formed.

In this embodiment, the drive device 4 further includes a deceleration mechanism 43 that decelerates the rotation of the drive source 41 and transmits the deceleration to the linear motion conversion mechanism 42. Furthermore, in this embodiment, the linear motion conversion mechanism 42 further includes a transmission member 424 to which rotation from the drive source 41 is transmitted via the deceleration mechanism 43.

The transmission member 424 is arranged coaxially with the second member 2. As described above, in this embodiment, the screw shaft member 421 is arranged coaxially with the second member 2. Therefore, in this embodiment, the transmission member 424 is arranged coaxially with the screw shaft member 421.

The transmission member 424 is connected to the screw shaft member 421 so as to rotate together with the screw shaft member 421. In this embodiment, the transmission member 424 is formed into a shaft shape extending along the axial direction L. The transmission member 424 is disposed inside the cylindrical portion 421b of the screw shaft member 421 in the radial direction R, and is connected to rotate integrally with the cylindrical portion 421b. In the illustrated example, a plurality of spline teeth extending in the axial direction L are formed on the outer peripheral portion of the transmission member 424 and are distributed in the circumferential direction. A plurality of spline teeth that engage with a plurality of spline teeth formed on the outer circumference of the transmission member 424 are distributed in the circumferential direction on the inner circumference of the cylindrical portion 421b so as to extend in the axial direction L. It is formed as follows.

In this embodiment, the reduction mechanism 43 includes a first reduction gear 431, a second reduction gear 432, a third reduction gear 433, and a fourth reduction gear 434.

The first reduction gear 431 is connected to the output element of the drive source 41 so as to rotate together with the output element. In this embodiment, the first reduction gear 431 is arranged on a separate axis from the transmission member 424. Further, in this embodiment, the first reduction gear 431 is arranged on the second axial side L2 with respect to the drive source 41.

The second reduction gear 432 meshes with the first reduction gear 431. The second reduction gear 432 is formed to have a larger diameter than the first reduction gear 431.

The third reduction gear 433 is connected to the second reduction gear 432 so as to rotate integrally therewith. The third reduction gear 433 is formed to have a smaller diameter than the second reduction gear 432. In this embodiment, the third reduction gear 433 is arranged on the first axial side L1 with respect to the second reduction gear 432.

The fourth reduction gear 434 meshes with the third reduction gear 433. The fourth reduction gear 434 is formed to have a larger diameter than the third reduction gear 433. Further, the fourth reduction gear 434 is connected to the transmission member 424 so as to rotate integrally therewith. In this embodiment, the fourth reduction gear 434 is arranged coaxially with the transmission member 424. The fourth reduction gear 434 is connected to the transmission member 424 so that the transmission member 424 extends from the fourth reduction gear 434 toward the first axial side L1.

The number of teeth of the second reduction gear 432 is greater than the number of teeth of the first reduction gear 431. The number of teeth of the fourth reduction gear 434 is greater than the number of teeth of the third reduction gear 433, which rotates integrally with the second reduction gear 432. Therefore, the rotation transmitted from the drive source 41 to the first reduction gear 431 is decelerated between the first reduction gear 431 and the second reduction gear 432, and then transmitted to the third reduction gear 433. The rotation of the third reduction gear 433 is then reduced in speed between the third reduction gear 433 and the fourth reduction gear 434 and transmitted to the transmission member 424.

In this embodiment, the drive source 41 is an electric motor. As described above, in this embodiment, the first reduction gear 431 connected to rotate integrally with the output element of the drive source 41 (here, the rotor of the electric motor) is on a separate axis from the transmission member 424. It is located in Therefore, in this embodiment, the drive source 41 is arranged on a separate axis from the transmission member 424.

Further, in this embodiment, the arrangement region of the drive source 41 in the axial direction L overlaps with the arrangement region of the linear motion conversion mechanism 42 in the axial direction L. In the illustrated example, the arrangement region of the drive source 41 in the axial direction L also overlaps with the arrangement region of the first frictional engagement element 31 and the second frictional engagement element 32 in the axial direction L.

As described above, in the present embodiment, the drive device 4 further includes a deceleration mechanism 43 that decelerates the rotation of the drive source 41 and transmits it to the linear motion conversion mechanism 42,
The linear motion conversion mechanism 42 includes a transmission member 424 to which rotation from the drive source 41 is transmitted via the deceleration mechanism 43,
The transmission member 424 is arranged coaxially with the second member 2,
The drive source 41 is an electric motor, and is arranged on a separate axis from the transmission member 424,
The arrangement region of the drive source 41 in the axial direction L overlaps with the arrangement region of the linear motion conversion mechanism 42 in the axial direction L.

According to this configuration, compared to a configuration in which the arrangement area in the axial direction L of the drive source 41 which is an electric motor does not overlap the arrangement area in the axial direction L of the linear motion conversion mechanism 42, the arrangement area in the axial direction L of the engagement device 10 is Dimensions can be kept small.

2. Engagement Device According to Second Embodiment Below, an engagement device 10 according to a second embodiment will be described with reference to FIG. 2. In this embodiment, the manner in which the first support portion 34 is installed is different from that of the engagement device 10 according to the first embodiment. Below, the explanation will focus on the differences from the engagement device 10 according to the first embodiment. Note that points that are not particularly described are the same as those of the engagement device 10 according to the first embodiment.

As shown in FIG. 2, in this embodiment, the first support portion 34 is provided on the pressing member 33, which is a member that is non-rotatably supported with respect to the first member 1. In the illustrated example, the first support portion 34 is integrally formed with the pressing member 33 and the nut member 422. The first support portion 34 is connected to the first radially extending portion 11 (herein, the restriction portion 111) so as to be non-rotatable and movable in the axial direction L. Specifically, the end portion of the first support portion 34 on the second axial side L2 is connected to the first radially extending portion 11 by spline engagement. Accordingly, in this embodiment as well, the nut member 422 is supported so as to be non-rotatable with respect to the first member 1 and movable in the axial direction L, similarly to the first embodiment. Further, in the illustrated example, the axial support portion 112 is located inside the first support portion 34 in the radial direction R and at a position overlapping the first support portion 34 when viewed in the radial direction along the radial direction R. It is located.

3. Vehicle Drive Device According to First Embodiment Below, a vehicle drive device 100 according to the first embodiment will be described with reference to FIGS. 3 and 4.

As shown in FIGS. 3 and 4, the vehicle drive device 100 includes the above-mentioned engagement device 10, a rotating electric machine 5 including a stator 51 and a rotor 52, and a wheel W (see FIG. 4) that is drivingly coupled to the rotating electric machine 5. It includes an output member 6 and a speed reducer 7 that reduces the rotation speed of the rotor 52 and transmits it to the output member 6. In this embodiment, the vehicle drive device 100 includes a differential gear mechanism 8 that distributes the rotation of the output member 6 to a pair of wheels W, and a reduction gear mechanism that switches the reduction ratio of the reduction gear 7 according to the engagement state. The apparatus further includes a combining device 20. Note that the engagement device 10 included in the vehicle drive device 100 according to the present embodiment is the engagement device 10 according to the first embodiment described above.

Here, in this application, "drive connection" refers to a state in which two rotating elements are connected so that driving force can be transmitted, and a state in which the two rotating elements are connected so that they rotate integrally, or This includes a state in which two rotating elements are connected so that driving force can be transmitted via one or more transmission members. Such transmission members include various members that transmit rotation at the same speed or at variable speeds, such as shafts, gear mechanisms, belts, chains, and the like. Note that the transmission member may include an engagement device that selectively transmits rotation and driving force, such as a friction engagement device, a meshing engagement device, and the like. However, when each rotating element of a planetary gear mechanism is referred to as "drive connection," it refers to a state in which a plurality of rotating elements in the planetary gear mechanism are connected to each other without intervening other rotating elements.

In this embodiment, the rotating electric machine 5 is housed in a first case member 91 that is a non-rotating member NR. The output member 6, the speed reducer 7, and the differential gear mechanism 8 are housed in a second case member 92, which is a non-rotating member NR. Further, the deceleration engagement device 20 is housed in a third case member 93 that is a non-rotating member NR. In this embodiment, the first member 1 as the non-rotating member NR in the engagement device 10 is joined to the first case member 91 from the second axial side L2. The first case member 91 is joined to the second case member 92 from the second axial side L2. Further, the third case member 93 is joined to the second case member 92 from the first axial side L1.

The rotating electric machine 5 functions as a driving force source for the wheels W (see FIG. 4). The rotating electric machine 5 has a function as a motor (electric motor) that receives power supply and generates power, and a function as a generator (generator) that receives power supply and generates power. Specifically, the rotating electric machine 5 is electrically connected to a power storage device (not shown) such as a battery or a capacitor. Then, the rotating electric machine 5 performs power running using the electric power stored in the power storage device to generate driving force. Further, the rotating electrical machine 5 generates power using the driving force transmitted from the wheel W side, and charges the power storage device.

In this embodiment, the rotating electric machine 5 is arranged on the first axial side L1 with respect to the engagement device 10. The rotating electric machine 5 is arranged coaxially with the engagement device 10.

The stator 51 of the rotating electric machine 5 is fixed to a non-rotating member NR (here, the first case member 91). The rotor 52 of the rotating electric machine 5 is rotatably supported by the stator 51. In this embodiment, the rotor 52 is arranged inside the stator 51 in the radial direction R.

The rotor 52 is connected to the second member 2 of the engagement device 10 so as to rotate integrally therewith. In this embodiment, the rotor 52 is connected to a rotor shaft 53 extending along the axial direction L so as to rotate integrally with the rotor shaft 53. The rotor shaft 53 is connected to the second member 2 so as to rotate integrally therewith. In the illustrated example, the shaft portion 22 of the second member 2 is arranged inside in the radial direction R with respect to the cylindrical portion formed at the end of the second axial side L2 of the rotor shaft 53. These are connected by spline engagement.

In this embodiment, the speed reducer 7 includes a speed reduction input shaft 71, a planetary gear mechanism 72, a first gear G1, a second gear G2, and a third gear G3.

The deceleration input shaft 71 is a shaft member formed to extend along the axial direction L. The deceleration input shaft 71 is connected to the rotor 52 of the rotating electrical machine 5 so as to rotate integrally therewith. In this embodiment, the deceleration input shaft 71 is disposed on the first axial side L1 with respect to the rotor 52 and coaxially with the rotor 52. The deceleration input shaft 71 is connected to the rotor shaft 53 so as to rotate integrally therewith. In the illustrated example, the end portion of the deceleration input shaft 71 on the second axial side L2 is located inside in the radial direction R with respect to the cylindrical portion formed at the end portion of the rotor shaft 53 on the first axial side L1. They are connected by spline engagement.

In this embodiment, the planetary gear mechanism 72 is a single pinion type planetary gear mechanism including a first sun gear S1, a first carrier C1, and a first ring gear R1.

The first sun gear S1 is connected to the deceleration input shaft 71 so as to rotate integrally therewith. The first carrier C1 is connected to the first gear G1 so as to rotate together with the first gear G1. Further, the first carrier C1 rotatably supports a first pinion gear P1 that meshes with the first sun gear S1 and the first ring gear R1. The first pinion gear P1 rotates (rotates) around its axis, and also rotates (revolutions) about the first sun gear S1 together with the first carrier C1. A plurality of first pinion gears P1 are provided at intervals along the orbit of the first pinion gear.

In this embodiment, the deceleration engagement device 20 includes a clutch mechanism 20C and a brake mechanism 20B. The deceleration engagement device 20 is configured such that when one of the clutch mechanism 20C and the brake mechanism 20B is in the engaged state, the other is in the released state.

The clutch mechanism 20C is configured to selectively engage the first rotating member RT1 and the second rotating member RT2, which are supported so as to be rotatable relative to each other. The brake mechanism 20B is configured to selectively engage the first rotating member RT1 and the non-rotating member NR (here, the third case member 93).

The first rotating member RT1 is connected to the first ring gear R1 of the planetary gear mechanism 72 so as to rotate integrally therewith. In this embodiment, the first rotating member RT1 is formed into a cylindrical shape that covers the outside of the second rotating member RT2 in the radial direction R.

The second rotating member RT2 is connected to the deceleration input shaft 71 so as to rotate integrally therewith. In this embodiment, the second rotating member RT2 is arranged on the first axial side L1 with respect to the deceleration input shaft 71.

When the clutch mechanism 20C is in the engaged state and the brake mechanism 20B is in the released state, a first ring gear R1 connected to the first rotating member RT1, a first carrier C1 connected to the first gear G1, The first sun gear S1 connected to the second rotating member RT2 via the deceleration input shaft 71 rotates integrally with the first sun gear S1. As a result, the rotation of the rotor 52 of the rotating electric machine 5 is not decelerated and is directly transmitted to the first gear G1.

On the other hand, when the clutch mechanism 20C is in the released state and the brake mechanism 20B is in the engaged state, the first ring gear R1 connected to the first rotating member RT1 is in a state where the first rotating member RT1 is fixed; The first carrier C1 connected to the first gear G1 and the first sun gear S1 connected to the second rotating member RT2 via the deceleration input shaft 71 rotate relative to each other. As a result, the rotation of the rotor 52 of the rotating electrical machine 5 is decelerated in the planetary gear mechanism 72 and transmitted to the first gear G1.

The first gear G1 meshes with the second gear G2. The second gear G2 is an idler gear that meshes with the third gear G3. That is, the first gear G1 and the third gear G3 mesh with the second gear G2 at mutually different positions in the circumferential direction of the second gear G2. In this embodiment, the third gear G3 corresponds to the output member 6.

In this embodiment, the first gear G1 is formed to have a smaller diameter than the third gear G3. Therefore, in this embodiment, the rotation of the first carrier C1 of the planetary gear mechanism 72 is decelerated by the power transmission path connecting the first gear G1 and the third gear G3, and is transmitted to the differential gear mechanism 8.

The differential gear mechanism 8 includes a first output section 81 drivingly connected to the wheel W on the first axial side L1, and a second output section 82 drivingly connected to the wheel W on the second axial side L2. We are prepared. The first output section 81 is connected to the wheel W on the first axial side L1 via a first drive shaft DS1 (see FIG. 4) extending in the axial direction L so as to rotate integrally with the wheel W. Further, the second output section 82 is connected to the wheel W on the second axial side L2 via a second drive shaft DS2 (see FIG. 4) extending in the axial direction L so as to rotate integrally with the wheel W. There is.

Further, the differential gear mechanism 8 is a planetary gear type differential gear mechanism including a second sun gear S2, a second carrier C2, and a second ring gear R2. In this embodiment, the differential gear mechanism 8 is a double pinion type planetary gear mechanism. Therefore, in this embodiment, the second carrier C2 rotatably supports the inner pinion gear P21 and the outer pinion gear P22 that mesh with each other.

The second sun gear S2 meshes with the inner pinion gear P21. The second sun gear S2 is connected to the second output section 82 so as to rotate integrally therewith. In this embodiment, the second output portion 82 is arranged to extend from the second sun gear S2 to the second axial side L2.

The second carrier C2 is connected to the first output section 81 so as to rotate integrally therewith. In this embodiment, the first output portion 81 is arranged to extend from the second carrier C2 to the first axial side L1.

The second ring gear R2 meshes with the outer pinion gear P22. The second ring gear R2 is connected to the third gear G3 as the output member 6 so as to rotate integrally therewith. In this embodiment, the second ring gear R2 is arranged inside the third gear G3 in the radial direction R. Further, the second ring gear R2 is arranged so as to overlap the third gear G3 when viewed in the radial direction R.

As described above, the vehicle drive device 100 is
The above-mentioned engagement device 10;
A rotating electrical machine 5 including a rotor 52;
an output member 6 drivingly connected to the wheel W;
a reducer 7 that reduces the rotation of the rotor 52 and transmits it to the output member 6,
The first member 1 is a non-rotating member NR,
The second member 2 is connected to the rotor 52 so as to rotate integrally therewith.

According to this configuration, the engagement device 10 selectively engages the second member 2, which rotates integrally with the rotor 52 of the rotating electric machine 5, with the first member 1, which is the non-rotating member NR. , can function as a braking device that brakes the rotation of the wheel W. Then, the braking torque caused by the engagement of the engagement device 10 can be amplified by the reduction gear 7 and transmitted to the wheels W. Therefore, even if the engagement device 10 is small, a large wheel braking force can be ensured.
Furthermore, as described above, the engagement device 10 has a configuration that allows for easy miniaturization in the axial direction L. Therefore, even if the engagement device 10 is arranged coaxially with the rotating electrical machine 5 as described above, the dimension of the vehicle drive device 100 in the axial direction L can be easily kept small.

4. Vehicle Drive Device According to Second Embodiment Below, a vehicle drive device 100 according to a second embodiment will be described with reference to FIGS. 5 and 6. In this embodiment, the deceleration engagement device 20 is not provided, and the configurations of the reducer 7 and the differential gear mechanism 8 are different from those of the vehicle drive device 100 according to the first embodiment. . Below, the explanation will focus on the differences from the vehicle drive device 100 according to the first embodiment. Note that points that are not particularly described are the same as those of the vehicle drive device 100 according to the first embodiment.

As shown in FIGS. 5 and 6, in this embodiment, the reducer 7 does not include the first gear G1, the second gear G2, and the planetary gear mechanism 72, but includes the fourth gear G4 and the counter gear mechanism. It is equipped with 73.

The fourth gear G4 is connected to the deceleration input shaft 71 so as to rotate integrally therewith. Note that, as described above, in this embodiment, the deceleration engagement device 20 and the planetary gear mechanism 72 are not provided. Therefore, as a matter of course, in this embodiment, the deceleration input shaft 71 is not connected to the second rotating member RT2 and the first sun gear S1.

The counter gear mechanism 73 includes a fifth gear G5 and a sixth gear G6 that are connected to rotate integrally with each other. The fifth gear G5 meshes with the fourth gear G4. The sixth gear G6 meshes with the third gear G3.

In this embodiment, the fifth gear G5 is formed to have a larger diameter than the fourth gear G4. The sixth gear G6 is formed to have a smaller diameter than the fifth gear G5. Further, the third gear G3 is formed to have a larger diameter than the sixth gear G6. Therefore, in the present embodiment, the rotation of the deceleration input shaft 71 that rotates integrally with the rotor 52 of the rotating electric machine 5 is decelerated in the power transmission path connecting the fourth gear G4 and the third gear G3, and the rotation is reduced by the differential gear. The signal is transmitted to the mechanism 8.

In this embodiment, the first output section 81 of the differential gear mechanism 8 is connected to rotate integrally with the second sun gear S2. The first output portion 81 is arranged to extend from the second sun gear S2 to the first axial side L1. Further, in this embodiment, the second output section 82 of the differential gear mechanism 8 is connected to rotate integrally with the second carrier C2. The second output section 82 is arranged to extend from the second carrier C2 to the second axial side L2.

5. Other Embodiments (1) In the above embodiments, the configuration in which the first member 1 is the non-rotating member NR has been described as an example. However, the present invention is not limited to such a configuration, and a configuration may be adopted in which the first member 1 is relatively rotatable with respect to the non-rotating member NR. That is, the engagement device 10 may be configured as a clutch instead of a brake. In this configuration, it is preferable to arrange a bearing between the first member 1 and the case housing the drive source 41 and the speed reduction mechanism 43.

(2) In the above embodiment, the vehicle drive device 100 has been described as an example of a configuration including the engagement device 10 according to the first embodiment. However, without being limited to such a configuration, for example, the vehicle drive device 100 may include the engagement device 10 according to the second embodiment.

(3) Note that the configurations disclosed in each embodiment described above can also be applied in combination with the configurations disclosed in other embodiments, as long as no contradiction occurs. Regarding other configurations, the embodiments disclosed herein are merely illustrative in all respects. Therefore, various modifications can be made as appropriate without departing from the spirit of the present disclosure.

The technology according to the present disclosure provides an engagement device including an engagement mechanism that selectively engages a first member and a second member, and a drive device that drives the engagement mechanism, and an engagement device including the engagement mechanism. It can be used in vehicle drive devices.

100: Vehicle drive device, 10: Engagement device, 1: First member, 11: First radially extending portion, 111: Regulation portion, 112: Axial support portion, 2: Second member, 3: Engagement mating mechanism, 31: first friction engagement element, 32: second friction engagement element, 33: pressing member, 34: first support section, 35: second support section, 4: drive device, 41: drive source, 42: Linear motion conversion mechanism, L: Axial direction, L1: First axial side, L2: Second axial side, R: Radial direction

Claims (5)

a first member;
a second member rotatably supported relative to the first member;
an engagement mechanism that selectively engages the first member and the second member;
An engagement device comprising: a drive device that drives the engagement mechanism;
The direction along the rotation axis of the second member is defined as an axial direction, one side in the axial direction is defined as a first axial side, and the other side in the axial direction is defined as a second axial side, which is orthogonal to the axial direction. The direction is the radial direction,
The engagement mechanism includes a first frictional engagement element, a second frictional engagement element arranged to face the first frictional engagement element in the axial direction, and the first frictional engagement element. and a pressing member that presses the second frictional engagement element from the first side in the axial direction, a first support part that supports the first frictional engagement element, and a second support part that supports the second frictional engagement element. comprising a support part;
The pressing member is supported to be non-rotatable with respect to the first member and movable in the axial direction,
Each of the first support part and the second support part is formed in a cylindrical shape along the axial direction,
The first support portion is provided on the first member or a member non-rotatably supported with respect to the first member,
The second support part is provided on the second member so as to be located on the outside in the radial direction with respect to the first support part,
The first friction engagement element is supported so as to be non-rotatable and movable in the axial direction with respect to the first support part,
The second frictional engagement element is supported so as to be non-rotatable and movable in the axial direction with respect to the second support part,
The drive device includes a drive source and a linear motion conversion mechanism that converts the rotational drive force of the drive source into the axial drive force and transmits it to the pressing member,
The first member includes a first radially extending portion disposed on the second axial side with respect to the first frictional engagement element and the second frictional engagement element and extending along the radial direction. Equipped with
The first radially extending portion includes a restriction portion that restricts movement of the first frictional engagement element and the second frictional engagement element toward the second side in the axial direction, and a an axial support part that is disposed inside the direction and supports the linear motion conversion mechanism in the axial direction,
The linear motion conversion mechanism is located inside the first frictional engagement element and the second frictional engagement element in the radial direction, and the first frictional engagement element is located inside the first frictional engagement element and the second frictional engagement element when viewed in a radial direction along the radial direction. and arranged at a position overlapping with the second frictional engagement element,
The pressing member presses the first frictional engagement element and the second frictional engagement element from the first side in the axial direction, and the restriction part presses the first frictional engagement element and the second frictional engagement element. An engagement device, wherein the engagement mechanism is brought into an engaged state by being supported from the second axial side. The linear motion conversion mechanism includes a supported part supported by the axial support part from the first axial side,
The regulating portion includes a first support surface facing the first axial side at a position overlapping the first frictional engagement element and the second frictional engagement element when viewed in the axial direction along the axial direction,
The axial support portion includes a second support surface facing the second axial side at a position overlapping the supported portion when viewed in the axial direction,
The engagement device according to claim 1, wherein the supported portion is arranged to overlap with the restriction portion when viewed in the radial direction. The first member includes a second radially extending portion disposed on the first axial side with respect to the pressing member and extending along the radial direction, and a second radially extending portion with respect to the second support portion. a non-rotating member further comprising: a connecting portion disposed on the outside of the axial direction and extending along the axial direction so as to connect the first radially extending portion and the second radially extending portion; and
The second member is disposed between the second radially extending portion and the pressing member in the axial direction, and extends in a third radial direction from the second support portion toward the inside in the radial direction. an extending portion; and a shaft-shaped portion that is arranged radially inside the second radial extending portion and extends from the third radial extending portion toward the first axial side. , comprising;
A support for rotatably supporting the shaft-like part with respect to the second radially-extending part, between the inner peripheral surface of the second radially extending part and the outer peripheral surface of the shaft-like part. The engagement device according to claim 1 or 2, wherein a bearing is arranged. The drive device further includes a deceleration mechanism that decelerates the rotation of the drive source and transmits it to the linear motion conversion mechanism,
The linear motion conversion mechanism includes a transmission member to which rotation from the drive source is transmitted via the speed reduction mechanism,
The transmission member is arranged coaxially with the second member,
The drive source is an electric motor, and is arranged on a separate axis from the transmission member,
The engagement device according to any one of claims 1 to 3, wherein the axial arrangement region of the drive source overlaps the axial arrangement region of the linear motion conversion mechanism. The engagement device according to any one of claims 1 to 4,
A rotating electrical machine with a rotor,
an output member drivingly connected to the wheel;
a reduction gear that reduces rotation of the rotor and transmits it to the output member,
The first member is a non-rotating member,
In the vehicle drive device, the second member is connected to rotate integrally with the rotor.

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