Engagement device and vehicle drive system equipped therewith

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

Technical Field

[0001] The present invention relates to 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 a vehicle drive device including the same.

Background Art

[0002] An example of such a technology is disclosed in Patent Document 1 below. In the following description of the background art, the reference numerals in Patent Document 1 are cited within parentheses.

[0003] The engagement device of Patent Document 1 includes an engagement mechanism (18) that selectively engages a second member that rotates integrally with a rotor (23) of a rotating electric machine (13) with respect to a case as a first member, and a drive device that drives the engagement mechanism.

[0004] The engagement mechanism (18) includes a first friction engagement element (66b), a second friction engagement element (66a) disposed so as to face the first friction engagement element in the axial direction (the left-right direction in FIGS. 1 and 2 of Patent Document 1), and a pressing member (68) that presses them in the axial direction.

[0005] The first friction engagement element (66b) is non-rotatable with respect to a case as a first member and is supported so as to be movable in the axial direction. Further, the second friction engagement element (66a) is non-rotatable with respect to a second member that rotates integrally with the rotor (23) and is supported so as to be movable in the axial direction.

[0006] The drive device includes a drive source (80) and a linear motion conversion mechanism (69) that converts the rotational driving force of the drive source into an axial driving force and transmits it to the pressing member (68).

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

[0008] In the engagement device of Patent Document 1, the case as the first member comprises a first wall portion (79) and a second wall portion (26) which are arranged separately on both sides in the axial direction relative to the first friction engagement element (66b) and the second friction engagement element (66a).

[0009] 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 Figures 1 and 2 of Patent Document 1). The second wall portion (26) is formed to support the first friction engagement element (66b) and the second friction engagement element (66a), which are pressed by the pressing member (68), from the other side in the axial direction (the left side in Figures 1 and 2 of Patent Document 1).

[0010] In this configuration, the force acting when the pressing member (68) presses the first friction engagement element (66b) and the second friction engagement element (66a) easily deforms the first wall portion (79) and the second wall portion (26) of the case so that they move apart in the axial direction. In order to minimize such deformation, it is necessary to increase the rigidity of the case. However, in the configuration in which the first wall portion (79) and the second wall portion (26) of the case are arranged to be axially separated from each other as described above, it is necessary to increase the rigidity over a wide area of ​​the case, which leads to the problem of increasing the size of the case and, consequently, the size of the engagement device.

[0011] Therefore, the realization of technology that can miniaturize the engagement device is desirable. [Means for solving the problem]

[0012] In light of the above, the characteristic configuration of the engagement device is: First member and A second member is supported so as to be rotatable relative to the first member, An engagement mechanism for selectively engaging the first member and the second member, An engagement device comprising a drive device for driving the engagement mechanism, The direction along the rotation axis of the second member is defined as the axial direction, one side in the axial direction is defined as the axial first side, the other side in the axial direction is defined as the axial second side, and the direction perpendicular to the axial direction is defined as the radial direction. The engagement mechanism comprises a first friction engagement element, a second friction engagement element arranged to face the first friction engagement element in the axial direction, a pressing member that presses the first friction engagement element and the second friction engagement element from the first axial side, a first support portion that supports the first friction engagement element, and a second support portion that supports the second friction engagement element. The pressing member is supported so as to be non-rotatable with respect to the first member and movable in the axial direction. Each of the first support portion and the second support portion is formed in a cylindrical shape along the axial direction, The first support portion is provided on the first member or a member that is non-rotatably supported with respect to the first member. The second support portion is provided on the second member so as to be located radially outward from the first support portion, The first friction engagement element is supported so as to be non-rotatable with respect to the first support and movable in the axial direction, The second friction engagement element is supported so as to be non-rotatable with respect to the second support and movable in the axial direction, The drive device comprises a drive source and a linear motion conversion mechanism that converts the rotational driving force of the drive source into an axial driving force and transmits it to the pressing member. The first member comprises a first radially extending portion that is positioned on the second axial side with respect to the first friction engagement element and the second friction engagement element and extends along the radial direction, The first radially extending portion comprises a restricting portion that restricts the movement of the first friction engagement element and the second friction engagement element toward the second axial side, and an axial support portion that is positioned radially inward from the restricting portion and supports the linear motion conversion mechanism in the axial direction. The linear motion conversion mechanism is positioned radially inward of the first friction engagement element and the second friction engagement element, and overlaps with the first friction engagement element and the second friction engagement element in a radial view along the radial direction. The engagement mechanism is engaged when the pressing member presses the first friction engagement element and the second friction engagement element from the first axial side, and the restricting portion supports the first friction engagement element and the second friction engagement element from the second axial side.

[0013] According to this characteristic configuration, the restricting portion supports the first and second friction engagement elements from the second axial side when the pressing member presses them from the first axial side. The axial support portion supports the axial load acting on the linear motion conversion mechanism when the pressing member presses the first and second friction engagement elements from the first axial side. The restricting portion and the axial support portion are provided on the same part of the first radially extending portion, that is, 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 acting when the pressing member presses the first and second friction engagement elements can be kept to a minimum. Therefore, it is easier to miniaturize the first member. Furthermore, according to this characteristic configuration, the linear motion conversion mechanism is positioned radially inward from the first and second friction engagement elements, and overlaps with the first and second friction engagement elements in a radial view along the radial direction. As a result, the axial dimensions of the engagement device can be kept smaller compared to a configuration in which the linear motion conversion mechanism is positioned so as not to overlap with the first and second friction engagement elements in a radial view. As described above, this feature configuration makes it possible to miniaturize the engagement device. [Brief explanation of the drawing]

[0014] [Figure 1] Cross-sectional view along the axial direction of the engagement device according to the first embodiment [Figure 2] Cross-sectional view along the axial direction of the engagement device according to the second embodiment [Figure 3]Axial cross-sectional view of the vehicle drive device according to the first embodiment [Figure 4] Skeleton diagram of the vehicle drive device according to the first embodiment [Figure 5] Axial cross-sectional view of the vehicle drive device according to the second embodiment [Figure 6] Skeleton diagram of the vehicle drive device according to the second embodiment

Mode for Carrying Out the Invention

[0015] 1. Engagement device according to the first embodiment Hereinafter, the engagement device 10 according to the 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 so as to be relatively rotatable with respect to the first member 1, an engagement mechanism 3 that selectively engages them, and a drive device 4 that drives the engagement mechanism 3.

[0016] In the following description, the direction along the rotation axis of the second member 2 is defined as the "axial direction L". One side of the axial direction L is defined as the "first axial side L1", and the other side of the axial direction L is defined as the "second axial side L2". The direction orthogonal to the axial direction L is defined as the "radial direction R". The radial direction R is defined based on the rotation axis of each rotating member such as the second member 2. When it is not necessary to distinguish which rotation axis is used as the reference or when it is clear which rotation axis is used as the reference, it may be simply referred to as the "radial direction R".

[0017] The engagement mechanism 3 includes a first friction engagement element 31, a second friction engagement element 32 arranged to face the first friction engagement element 31 in the axial direction L, a pressing member 33 that presses them from the first axial side L1, a first support portion 34 that supports the first friction engagement element 31, and a second support portion 35 that supports the second friction engagement element 32.

[0018] The drive device 4 includes a drive source 41 and a linear motion conversion mechanism 42 that converts the rotational driving force of the drive source 41 into a driving force in the axial direction L and transmits it to the pressing member 33.

[0019] In this embodiment, multiple first friction engagement elements 31 and second friction engagement elements 32 are provided, and they are arranged alternately along the axial direction L. Either the first friction engagement element 31 or the second friction engagement element 32 can be used as a friction plate, and the other as a separate plate.

[0020] Each of the first support portion 34 and the second support portion 35 is formed in a cylindrical shape along the axial direction L. The second support portion 35 is positioned radially outward from the first support portion 34 in the direction R.

[0021] The first support portion 34 supports the first friction engagement element 31 from the inside in the radial direction R. The first friction engagement element 31 is supported by the first support portion 34 so as to be immovable in the axial direction L but immovable 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 circumference of the first friction engagement element 31 and are dispersed in the circumferential direction. A plurality of spline teeth that engage with the plurality of spline teeth formed on the inner circumference of the first friction engagement element 31 are formed on the outer circumference of the first support portion 34 and are dispersed in the circumferential direction so as to extend in the axial direction L.

[0022] The second support portion 35 supports the second friction engagement element 32 from the outside in the radial direction R. The second friction engagement element 32 is supported by the second support portion 35 so as to be immovable in the axial direction L but immovable 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 circumference of the second friction engagement element 32 and are dispersed in the circumferential direction. A plurality of spline teeth that engage with the plurality of spline teeth formed on the outer circumference of the second friction engagement element 32 are formed on the inner circumference of the second support portion 35 and are dispersed in the circumferential direction so as to extend in the axial direction L.

[0023] The first member 1 includes a first radially extending portion 11. The first radially extending portion 11 is positioned on the second axial side L2 with respect to the first friction engagement element 31 and the second friction 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 that extends along the radial direction R with respect to the rotation axis of the second member 2.

[0024] The first radially extending portion 11 comprises a restricting portion 111 and an axial support portion 112. The restricting portion 111 is configured to restrict the movement of the first friction engagement element 31 and the second friction engagement element 32 toward the second axial side L2. The axial support portion 112 is positioned radially R inward from the restricting portion 111. The axial support portion 112 is configured to support the linear motion conversion mechanism 42 in the axial direction L.

[0025] In this embodiment, the first member 1 further comprises a second radially extending portion 12 and a connecting portion 13. The second radially extending portion 12 is positioned on the first axial side L1 relative 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 positioned on the outside of the radial direction R relative to the second support portion 35. The connecting portion 13 extends along the axial direction L to connect the first radially extending portion 11 and the second radially extending portion 12.

[0026] In this embodiment, the second radially extending portion 12 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 connecting portion 13 is formed in the shape of a cylinder that covers the outside of the radial direction R of the second support portion 35. 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 axial second side L2 of the connecting portion 13. The second radially extending portion 12 is joined to the connecting portion 13 so as to cover the opening on the axial first side L1 of the connecting portion 13.

[0027] Furthermore, in this embodiment, the first member 1 is a non-rotating member NR. In this example, the first member 1 is a case that houses the second member 2, the engagement mechanism 3, and the drive device 4.

[0028] The first support portion 34 is provided on the first member 1, or on a member that is non-rotatably supported with respect to the first member 1. In this embodiment, the first support portion 34 is provided on the first member 1. In the illustrated example, the first support portion 34 is integrally formed with the restricting portion 111 so as to extend from the restricting portion 111 of the first radially extending portion 11 of the first member 1 toward the first axial side L1. On the other hand, the second support portion 35 is provided on the second member 2.

[0029] In this embodiment, the linear motion conversion mechanism 42 comprises a screw shaft member 421 and a nut member 422.

[0030] 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. Also in this embodiment, the screw shaft member 421 is arranged to penetrate the first member 1 in the axial direction L.

[0031] Furthermore, the screw shaft member 421 is positioned radially inward of the first friction engagement element 31 and the second friction engagement element 32 in the radial direction R. Moreover, the screw shaft member 421 is positioned so as to overlap with the first friction engagement element 31 and the second friction engagement element 32 in a radial view along the radial direction R. Thus, the linear motion conversion mechanism 42 is positioned radially inward of the first friction engagement element 31 and the second friction engagement element 32 in the radial direction R, and so as to overlap with the first friction engagement element 31 and the second friction engagement element 32 in a radial view along the radial direction R. Here, regarding the arrangement of the two elements, "overlapping in a specific direction view" means that when a virtual line parallel to the line of sight is moved in each direction perpendicular to the virtual line, there exists at least a portion of the region where the virtual line intersects both of the two elements.

[0032] In this embodiment, the screw shaft member 421 comprises a threaded portion 421a and a cylindrical portion 421b. A male thread is formed on the outer circumference 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 positioned on the second axial side L2 relative to the threaded portion 421a.

[0033] The nut member 422 is configured to be screwed onto the threaded portion 421a of the screw shaft member 421. Specifically, the inner circumference of the nut member 422 has a female thread that screws onto the male thread of the threaded portion 421a. Therefore, as the screw shaft member 421 rotates, the nut member 422 performs linear motion along the axial direction L in accordance with the direction of rotation and the orientation of the male and female threads.

[0034] The nut member 422 is supported on the first member 1 so as to be immobile and movable in the axial direction L. In this embodiment, the nut member 422 is positioned radially R inward from the first support portion 34. The nut member 422 is connected to the first support portion 34 so as to be immobile and movable in the axial direction L, via an annular connecting member 42a positioned between the nut member 422 and the first support portion 34 in the radial direction R. In the illustrated example, a plurality of spline teeth extending in the axial direction L are formed on the outer circumference of the nut member 422, distributed circumferentially. A plurality of spline teeth that engage with the plurality of spline teeth formed on the outer circumference of the nut member 422 are formed on the inner circumference of the connecting member 42a, distributed circumferentially so as to extend in the axial direction L. A plurality of spline teeth extending in the axial direction L are formed on the inner circumference of the first support portion 34, distributed circumferentially. Furthermore, on the outer circumference of the connecting member 42a, multiple spline teeth are formed in a circumferential direction, distributed so as to extend in the axial direction L, and engage with multiple spline teeth formed on the inner circumference of the first support portion 34.

[0035] Furthermore, the nut member 422 is connected to the pressing member 33 so as to move integrally with it 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 immobile relative to the first member 1 and movable in the axial direction L.

[0036] In this embodiment, the linear motion conversion mechanism 42 further comprises 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 portion 423 is rotatably supported with respect to the axial support portion 112. In this embodiment, the supported portion 423 is supported by the axial support portion 112 from the first axial side L1 via a first bearing B1. The first bearing B1 is a thrust bearing that rotatably supports the supported portion 423 with respect to the axial support portion 112. 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 radially outward from the cylindrical portion 421b in the radial direction R.

[0037] When the pressing member 33 moves toward the second axial direction L2 and presses the first friction engagement element 31 and the second friction engagement element 32, the restricting portion 111 of the first radially extending portion 11 of the first member 1 restricts the movement of the first friction engagement element 31 and the second friction engagement element 32 toward the second axial direction L2. In other words, the restricting portion 111 supports the first friction engagement element 31 and the second friction engagement element 32, which are pressed by the pressing member 33, from the second axial direction L2. As a result, the first friction engagement element 31 and the second friction engagement element 32 are connected so that they cannot rotate relative to each other, and the engagement mechanism 3 enters an engaged state. As described above, in this embodiment, the first member 1, which is provided with the first support portion 34 that supports the first friction engagement element 31, is a non-rotating member NR. Therefore, when the engagement mechanism 3 enters an engaged state, the second member 2, which is provided with the second support portion 35 that supports the second friction engagement element 32, becomes non-rotatable.

[0038] On the other hand, when the pressing member 33 moves axially toward the first side L1 and the pressing of the first friction engagement element 31 and the second friction engagement element 32 by the pressing member 33 is released, the first friction engagement element 31 and the second friction engagement element 32 become able to rotate relative to each other, and the engagement mechanism 3 is released.

[0039] As described above, the engagement device 10 is First member 1 and A second member 2 is supported so as to be rotatable 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 the engagement mechanism 3, The engagement mechanism 3 comprises a first friction engagement element 31, a second friction engagement element 32 positioned opposite the first friction engagement element 31 in the axial direction L, a pressing member 33 that presses the first friction engagement element 31 and the second friction engagement element 32 from the axial first side L1, a first support portion 34 that supports the first friction engagement element 31, and a second support portion 35 that supports the second friction engagement element 32. The pressing member 33 is supported so as to be immovable in the axial direction L relative to the first member 1, and is not rotatable. Each of the first support portion 34 and the second support portion 35 is formed in a cylindrical shape along the axial direction L. 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. The second support portion 35 is provided on the second member 2 so as to be located radially outward from the first support portion 34 in the radial direction R. The first friction engagement element 31 is supported by the first support portion 34 so as to be non-rotatable and movable in the axial direction L. The second friction engagement element 32 is supported by the second support portion 35 so as to be non-rotatable and movable in the axial direction L. The drive unit 4 comprises a drive source 41 and a linear motion conversion mechanism 42 that converts the rotational driving force of the drive source 41 into an axial driving force L and transmits it to the pressing member 33. The first member 1 includes a first radially extending portion 11 that is positioned on the second axial side L2 relative to the first friction engagement element 31 and the second friction engagement element 32 and extends along the radial direction R. The first radially extending portion 11 includes a restricting portion 111 that restricts the movement of the first friction engagement element 31 and the second friction engagement element 32 toward the second axial side L2, and an axial support portion 112 that is positioned radially R inward from the restricting portion 111 and supports the linear motion conversion mechanism 42 in the axial direction L. The linear motion conversion mechanism 42 is positioned inside the radial direction R relative to the first friction engagement element 31 and the second friction engagement element 32, and overlaps with the first friction engagement element 31 and the second friction engagement element 32 in a radial view along the radial direction R. The pressing member 33 presses the first friction engagement element 31 and the second friction engagement element 32 from the first axial side L1, and the restricting portion 111 supports the first friction engagement element 31 and the second friction engagement element 32 from the second axial side L2, thereby engaging the engagement mechanism 3.

[0040] In this configuration, the restricting portion 111 supports the first friction engagement element 31 and the second friction engagement element 32 from the second axial direction L2 when the pressing member 33 presses them from the first axial direction L1. The axial support portion 112 supports the axial load L acting on the linear motion conversion mechanism 42 when the pressing member 33 presses the first friction engagement element 31 and the second friction engagement element 32 from the first axial direction L1. The restricting portion 111 and the axial support portion 112 are provided on the same part of the first radially extending portion 11, that is, the first member 1. As a result, by simply increasing the rigidity of the first radially extending portion 11, the deformation of the first member 1 due to the force acting when the pressing member 33 presses the first friction engagement element 31 and the second friction engagement element 32 can be kept to a minimum. Therefore, it is easier to miniaturize the first member 1. Furthermore, according to this configuration, the linear motion conversion mechanism 42 is positioned inside the radial direction R relative to the first friction engagement element 31 and the second friction engagement element 32, and overlaps with the first friction engagement element 31 and the second friction engagement element 32 in a radial view along the radial direction R. As a result, the axial dimension L of the engagement device 10 can be kept smaller compared to a configuration in which the linear motion conversion mechanism 42 is positioned so as not to overlap with the first friction engagement element 31 and the second friction engagement element 32 in a radial view. As described above, this configuration makes it possible to miniaturize the engagement device 10.

[0041] In this embodiment, the restricting portion 111 is provided with a first support surface 111a facing the first axial direction L1. The first support surface 111a is positioned to overlap with the first friction engagement element 31 and the second friction engagement element 32 in an axial view along the axial direction L.

[0042] In this embodiment, the axial support portion 112 is provided with a second support surface 112a facing the second axial direction L2. The second support surface 112a is positioned in an axial view along the axial direction L, overlapping with the supported portion 423 of the linear motion conversion mechanism 42. In this embodiment, the first bearing B1 is positioned between the second support surface 112a and the surface of the supported portion 423 facing the first axial direction L1, in the axial direction L.

[0043] Furthermore, in this embodiment, the supported portion 423 of the linear motion conversion mechanism 42 is positioned so as to overlap with the restricting portion 111 of the first radially extending portion 11 of the first member 1 when viewed radially along the radial direction R. In the illustrated example, the axial support portion 112 is positioned on the first axial side L1 relative to the restricting portion 111. The supported portion 423 is positioned in the region enclosed by the inner circumferential surface of the restricting portion 111 and the second support surface 112a of the axial support portion 112. Here, the axial support portion 112 is positioned so as to overlap with the first friction engagement element 31 and the second friction engagement element 32 when viewed radially along the radial direction R.

[0044] Thus, in this embodiment, the linear motion conversion mechanism 42 includes a supported portion 423 that is supported from the axial first side L1 by the axial support portion 112, The restricting portion 111 is provided with a first support surface 111a facing the first axial side L1 at a position that overlaps with the first friction engagement element 31 and the second friction engagement element 32 in an axial view along the axial direction L, The axial support portion 112 is provided with a second support surface 112a facing the second axial side L2 at a position that overlaps with the supported portion 423 in an axial view along the axial direction L, The supported portion 423 is positioned so as to overlap with the regulating portion 111 in a radial view along the radial direction R.

[0045] With this configuration, the axial dimension L of the engagement device 10 can be kept smaller compared to a configuration in which the supported portion 423 is arranged so as not to overlap with the restricting portion 111 in a radial view. Furthermore, with this configuration, the first support surface 111a of the restricting portion 111 can appropriately support the first friction engagement element 31 and the second friction engagement element 32 from the second axial side L2. In addition, 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.

[0046] In this embodiment, the second member 2 comprises a third radially extending portion 21 and a shaft-like portion 22. The third radially extending portion 21 is positioned 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-like portion 22 is positioned inward in the radial direction R relative to the second radially extending portion 12 of the first member 1. The shaft-like portion 22 is formed to extend inward in the axial direction L1 from the third radially extending portion 21. In this embodiment, a second bearing B2 is positioned between the inner circumferential surface of the second radially extending portion 12 and the outer circumferential surface of the shaft-like portion 22. The second bearing B2 is a "support bearing" for rotatably supporting the shaft-like portion 22 with respect to the second radially extending portion 12.

[0047] Thus, in this embodiment, the first member 1 is a non-rotating member NR further comprising a second radially extending portion 12 positioned on the first axial side L1 relative to the pressing member 33 and extending along the radial direction R, and a connecting portion 13 positioned on the radially outward side R relative to the second support portion 35 and extending along the axial direction L to connect the first radially extending portion 11 and the second radially extending portion 12. The second member 2 comprises a third radially extending portion 21 positioned between the second radially extending portion 12 and the pressing member 33 in the axial direction L and extending inward from the second support portion 35 in the radial direction R, and a shaft-shaped portion 22 positioned inward from the second radially extending portion 12 in the radial direction R and extending from the third radially extending portion 21 toward the first axial direction L1. A second bearing B2 is positioned between the inner circumferential surface of the second radially extending portion 12 and the outer circumferential surface of the shaft-shaped portion 22, serving as a support bearing to rotatably support the shaft-shaped portion 22 relative to the second radially extending portion 12.

[0048] In this configuration, the second bearing B2, which acts as a support bearing, is supported by the second radially extending portion 12 of the first member 1, which acts as a non-rotating member NR. As described above, when the pressing member 33 presses the first friction engagement element 31 and the second friction engagement element 32, the first radially extending portion 11 of the first member 1 supports the first friction engagement element 31 and the second friction engagement element 32 and the linear motion conversion mechanism 42. Therefore, the second radially extending portion 12, which is connected to the first radially extending portion 11 via the connecting portion 13, is less susceptible to force acting on it when the pressing member 33 presses the first friction engagement element 31 and the second friction engagement element 32. Consequently, displacement or tilting of the second bearing B2, which acts as a support bearing supported by the second radially extending portion 12, can be avoided. Furthermore, the need to ensure high rigidity of the second radially extending portion 12 is reduced. Therefore, it is easier to miniaturize the first component 1, and consequently, the engagement device 10.

[0049] 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 axial first side L1 end of the second support portion 35, and the inner end of the third radially extending portion 21 in the radial direction R is connected to the axial second side L2 end of the shaft-shaped portion 22. In the illustrated example, the third radially extending portion 21, the shaft-shaped portion 22, and the second support portion 35 are integrally formed.

[0050] In this embodiment, the drive unit 4 further includes a reduction mechanism 43 that reduces the rotation of the drive source 41 and transmits it to the linear motion conversion mechanism 42. In this embodiment, the linear motion conversion mechanism 42 further includes a transmission member 424 to which the rotation from the drive source 41 is transmitted via the reduction mechanism 43.

[0051] 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.

[0052] The transmission member 424 is connected to the screw shaft member 421 so as to rotate integrally with it. In this embodiment, the transmission member 424 is formed in an axial shape extending along the axial direction L. The transmission member 424 is positioned radially R inward relative to the cylindrical portion 421b of the screw shaft member 421, and is connected so as 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 circumference of the transmission member 424 and are dispersed circumferentially. A plurality of spline teeth that engage with the plurality of spline teeth formed on the outer circumference of the transmission member 424 are formed on the inner circumference of the cylindrical portion 421b, and are dispersed circumferentially so as to extend in the axial direction L.

[0053] 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.

[0054] The first reduction gear 431 is connected to the output element of the drive source 41 so as to rotate integrally with it. In this embodiment, the first reduction gear 431 is located on a separate shaft from the transmission member 424. Also in this embodiment, the first reduction gear 431 is located on the second axial side L2 relative to the drive source 41.

[0055] 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.

[0056] The third reduction gear 433 is connected to the second reduction gear 432 so as to rotate integrally with it. 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 positioned on the first axial side L1 relative to the second reduction gear 432.

[0057] 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. The fourth reduction gear 434 is also connected to the transmission member 424 so as to rotate integrally with it. 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 such that the transmission member 424 extends from the fourth reduction gear 434 toward the first axial direction L1.

[0058] The second reduction gear 432 has more teeth than the first reduction gear 431. The fourth reduction gear 434 also has more teeth than 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 reduced between the first reduction gear 431 and the second reduction gear 432 before being transmitted to the third reduction gear 433. The rotation of the third reduction gear 433 is then reduced between the third reduction gear 433 and the fourth reduction gear 434 before being transmitted to the transmission member 424.

[0059] In this embodiment, the drive source 41 is an electric motor. As described above, in this embodiment, the first reduction gear 431, which is connected to the output element of the drive source 41 (in this case, the rotor of the electric motor) so as to rotate integrally with it, is located on a different shaft from the transmission member 424. Therefore, in this embodiment, the drive source 41 is located on a different shaft from the transmission member 424.

[0060] Furthermore, in this embodiment, the axial L arrangement region of the drive source 41 overlaps with the axial L arrangement region of the linear motion conversion mechanism 42. In the illustrated example, the axial L arrangement region of the drive source 41 also overlaps with the axial L arrangement regions of the first friction engagement element 31 and the second friction engagement element 32.

[0061] Thus, in this embodiment, the drive unit 4 further includes a reduction mechanism 43 that reduces 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 that transmits rotation from the drive source 41 via a reduction mechanism 43. The transmission member 424 is arranged coaxially with the second member 2. The drive source 41 is an electric motor, and is located on a different shaft from the transmission member 424. The axial L arrangement area of ​​the drive source 41 overlaps with the axial L arrangement area of ​​the linear motion conversion mechanism 42.

[0062] With this configuration, the axial dimension L of the engagement device 10 can be kept smaller compared to a configuration in which the axial dimension L of the drive source 41, which is an electric motor, does not overlap with the axial dimension L of the linear motion conversion mechanism 42.

[0063] 2. Engagement device according to the second embodiment In the following description, the engagement device 10 according to the second embodiment will be explained with reference to Figure 2. In this embodiment, the installation configuration of the first support portion 34 differs from that of the engagement device 10 according to the first embodiment. In the following description, the differences from the engagement device 10 according to the first embodiment will be explained in detail. Unless otherwise specified, the same applies as to the engagement device 10 according to the first embodiment.

[0064] As shown in Figure 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 relative 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 non-rotatably connected to the first radially extending portion 11 (here, the restricting portion 111) and movable in the axial direction L. Specifically, the axial second side L2 end of the first support portion 34 is connected to the first radially extending portion 11 by spline engagement. Thus, in this embodiment as well, similar to the first embodiment, the nut member 422 is non-rotatably supported relative to the first member 1 and movable in the axial direction L. In the illustrated example, the axial support portion 112 is located inside the radial direction R relative to the first support portion 34 and is positioned to overlap with the first support portion 34 in a radial view along the radial direction R.

[0065] 3. Vehicle drive system according to the first embodiment In the following description, the vehicle drive system 100 according to the first embodiment will be explained with reference to Figures 3 and 4.

[0066] As shown in Figures 3 and 4, the vehicle drive unit 100 includes the engagement device 10 described above, a rotating electric machine 5 equipped with a stator 51 and a rotor 52, an output member 6 driven and connected to a wheel W (see Figure 4), and a reduction gear 7 that reduces the rotation of the rotor 52 and transmits it to the output member 6. In this embodiment, the vehicle drive unit 100 further includes a differential gear mechanism 8 that distributes the rotation of the output member 6 to a pair of wheels W, and a reduction engagement device 20 that switches the reduction ratio of the reduction gear 7 according to the engagement state. The engagement device 10 included in the vehicle drive unit 100 according to this embodiment is the engagement device 10 according to the first embodiment described above.

[0067] Herein, in this application, "drive connection" refers to a state in which two rotating elements are connected in a manner that can transmit driving force, and includes a state in which the two rotating elements are connected so as to rotate as a whole, or a state in which the two rotating elements are connected in a manner that can transmit driving force via one or more transmission members. Such transmission members include various members that transmit rotation at the same speed or at a variable speed, such as shafts, gear mechanisms, belts, chains, etc. Furthermore, the transmission members may also include engagement devices that selectively transmit rotation and driving force, such as friction engagement devices and meshing engagement devices. However, when referring to "drive connection" for each rotating element of a planetary gear mechanism, it refers to a state in which multiple rotating elements in the planetary gear mechanism are connected to each other without the need for other rotating elements.

[0068] In this embodiment, the rotating electric machine 5 is housed in a first case member 91, which is a non-rotating member NR. The output member 6, the reduction gear 7, and the differential gear mechanism 8 are housed in a second case member 92, which is a non-rotating member NR. The reduction engagement device 20 is housed in a third case member 93, which is a non-rotating member NR. In this embodiment, the first member 1, which is a 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. The third case member 93 is joined to the second case member 92 from the first axial side L1.

[0069] The rotating electric machine 5 functions as a driving force source for the wheel W (see Figure 4). The rotating electric machine 5 has the function of a motor that generates power when power is supplied, and the function of a generator that generates power when power is supplied. Specifically, the rotating electric machine 5 is electrically connected to an energy storage device such as a battery or capacitor (not shown). The rotating electric machine 5 then generates driving force by moving using the power stored in the energy storage device. In addition, the rotating electric machine 5 generates electricity using the driving force transmitted from the wheel W to charge the energy storage device.

[0070] In this embodiment, the rotating electric machine 5 is positioned on the first axial side L1 relative to the engaging device 10. Furthermore, the rotating electric machine 5 is positioned coaxially with the engaging device 10.

[0071] 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 relative to the stator 51. In this embodiment, the rotor 52 is positioned radially inward R relative to the stator 51.

[0072] The rotor 52 is connected to the second member 2 of the engagement device 10 so as to rotate integrally with it. In this embodiment, the rotor 52 is connected to the rotor shaft 53 which extends along the axial direction L so as to rotate integrally with it. The rotor shaft 53 is connected to the second member 2 so as to rotate integrally with it. In the illustrated example, the axial portion 22 of the second member 2 is positioned radially R inward of the cylindrical portion formed at the end of the second axial side L2 of the rotor shaft 53, and they are connected by spline engagement.

[0073] In this embodiment, the reduction gear 7 includes a reduction input shaft 71, a planetary gear mechanism 72, a first gear G1, a second gear G2, and a third gear G3.

[0074] The reduction input shaft 71 is a shaft member formed to extend along the axial direction L. The reduction input shaft 71 is connected to the rotor 52 of the rotating electric machine 5 so as to rotate integrally with it. In this embodiment, the reduction input shaft 71 is located on the first axial side L1 relative to the rotor 52 and is coaxial with the rotor 52. The reduction input shaft 71 is connected to the rotor shaft 53 so as to rotate integrally with it. In the illustrated example, the end of the reduction input shaft 71 on the second axial side L2 is positioned radially R inward from the cylindrical portion formed at the end of the first axial side L1 of the rotor shaft 53, and they are connected by spline engagement.

[0075] In this embodiment, the planetary gear mechanism 72 is a single-pinion type planetary gear mechanism comprising a first sun gear S1, a first carrier C1, and a first ring gear R1.

[0076] The first sun gear S1 is connected to the reduction input shaft 71 so as to rotate integrally with it. The first carrier C1 is connected to the first gear G1 so as to rotate integrally with it. The first carrier C1 also rotatably supports the first pinion gear P1, which 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 (revolves) around the first sun gear S1 together with the first carrier C1. Multiple first pinion gears P1 are provided spaced apart from each other along their orbital trajectory.

[0077] In this embodiment, the deceleration engagement device 20 comprises 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 engaged, the other is released.

[0078] The clutch mechanism 20C is configured to selectively engage a first rotating member RT1 and a second rotating member RT2, which are supported to rotate relative to each other. The brake mechanism 20B is configured to selectively engage the first rotating member RT1 with a non-rotating member NR (in this case, a third case member 93).

[0079] The first rotating member RT1 is connected to the first ring gear R1 of the planetary gear mechanism 72 so as to rotate integrally with it. In this embodiment, the first rotating member RT1 is formed in a cylindrical shape that covers the radially outer side R of the second rotating member RT2.

[0080] The second rotating member RT2 is connected to the reduction input shaft 71 so as to rotate integrally with it. In this embodiment, the second rotating member RT2 is positioned on the first axial side L1 with respect to the reduction input shaft 71.

[0081] When the clutch mechanism 20C is engaged and the brake mechanism 20B is released, the first ring gear R1 connected to the first rotating member RT1, 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 reduction input shaft 71 rotate together as a single unit. As a result, the rotation of the rotor 52 of the rotating electric machine 5 is not reduced and is transmitted directly to the first gear G1.

[0082] On the other hand, when the clutch mechanism 20C is disengaged and the brake mechanism 20B is engaged, with the first rotating member RT1 fixed, the first ring gear R1 connected to the first rotating member RT1, 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 reduction input shaft 71 rotate relative to each other. As a result, the rotation of the rotor 52 of the rotating electric machine 5 is reduced in the planetary gear mechanism 72 and transmitted to the first gear G1.

[0083] 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. In other words, the first gear G1 and the third gear G3 mesh with the second gear G2 at different positions in the circumferential direction of the second gear G2. In this embodiment, the third gear G3 corresponds to the output member 6.

[0084] In this embodiment, the first gear G1 is formed with 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 reduced in the power transmission path connecting the first gear G1 and the third gear G3 and transmitted to the differential gear mechanism 8.

[0085] The differential gear mechanism 8 includes a first output unit 81 driven and connected to the wheel W on the first axial side L1, and a second output unit 82 driven and connected to the wheel W on the second axial side L2. The first output unit 81 is connected via a first drive shaft DS1 (see Figure 4) extending in the axial direction L, so as to rotate integrally with the wheel W on the first axial side L1. The second output unit 82 is connected via a second drive shaft DS2 (see Figure 4) extending in the axial direction L, so as to rotate integrally with the wheel W on the second axial side L2.

[0086] Furthermore, the differential gear mechanism 8 is a planetary gear type differential gear mechanism equipped with 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, which mesh with each other.

[0087] The second sun gear S2 meshes with the inner pinion gear P21. The second sun gear S2 is connected to the second output unit 82 so as to rotate integrally with it. In this embodiment, the second output unit 82 is positioned to extend from the second sun gear S2 in the axial direction second side L2.

[0088] The second carrier C2 is connected to the first output unit 81 so as to rotate integrally with it. In this embodiment, the first output unit 81 is positioned to extend from the second carrier C2 in the axial direction first side L1.

[0089] The second ring gear R2 meshes with the outer pinion gear P22. The second ring gear R2 is connected to the third gear G3, which acts as the output member 6, so as to rotate integrally with it. In this embodiment, the second ring gear R2 is positioned radially inward of the third gear G3 in the radial direction R. Furthermore, the second ring gear R2 is positioned so as to overlap with the third gear G3 in a radial view along the radial direction R.

[0090] As described above, the vehicle drive system 100 is The above-mentioned engagement device 10, A rotating electric machine 5 equipped with a rotor 52, An output member 6 is driven and connected to the wheel W, It includes a reduction gear 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 component 2 is connected to the rotor 52 so as to rotate integrally with it.

[0091] With this configuration, the engagement device 10 can selectively engage the second member 2, which rotates integrally with the rotor 52 of the rotating electric machine 5, with the first member 1, which is a non-rotating member NR, thereby functioning as a braking device to brake the rotation of the wheel W. The braking torque generated by the engagement of the engagement device 10 can be amplified by the reduction gear 7 and transmitted to the wheel W. Therefore, even if the engagement device 10 is small, a large braking force for the wheel can be secured. Furthermore, as mentioned above, the engagement device 10 is configured to be easily miniaturized in the axial direction L. Therefore, even if the engagement device 10 is arranged coaxially with the rotating electric machine 5 as described above, it is easy to keep the axial dimension L of the vehicle drive unit 100 small.

[0092] 4. Vehicle drive system according to the second embodiment The vehicle drive system 100 according to the second embodiment will be described below with reference to Figures 5 and 6. In this embodiment, the reduction engagement device 20 is not provided, and the configuration of the reduction gear 7 and differential gear mechanism 8 differs from that of the vehicle drive system 100 according to the first embodiment. The following description will focus on the differences from the vehicle drive system 100 according to the first embodiment. Unless otherwise specified, the vehicle drive system 100 according to the first embodiment will be described as being the same as that of the vehicle drive system 100 according to the first embodiment.

[0093] As shown in Figures 5 and 6, in this embodiment, the reduction gear 7 does not include a first gear G1, a second gear G2, and a planetary gear mechanism 72, but instead includes a fourth gear G4 and a counter gear mechanism 73.

[0094] The fourth gear G4 is connected to the reduction input shaft 71 so as to rotate integrally with it. As mentioned above, in this embodiment, the reduction engagement device 20 and the planetary gear mechanism 72 are not provided. Therefore, naturally, in this embodiment, the reduction input shaft 71 is not connected to the second rotating member RT2 and the first sun gear S1.

[0095] The counter gear mechanism 73 includes a fifth gear G5 and a sixth gear G6 that are linked 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.

[0096] In this embodiment, the fifth gear G5 is formed with a larger diameter than the fourth gear G4. The sixth gear G6 is formed with a smaller diameter than the fifth gear G5. The third gear G3 is formed with a larger diameter than the sixth gear G6. Therefore, in this embodiment, the rotation of the reduction input shaft 71, which rotates integrally with the rotor 52 of the rotating electric machine 5, is reduced in the power transmission path connecting the fourth gear G4 and the third gear G3 and transmitted to the differential gear mechanism 8.

[0097] In this embodiment, the first output unit 81 of the differential gear mechanism 8 is connected to the second sun gear S2 so as to rotate integrally with it. The first output unit 81 is positioned to extend from the second sun gear S2 in the first axial direction L1. In this embodiment, the second output unit 82 of the differential gear mechanism 8 is connected to the second carrier C2 so as to rotate integrally with it. The second output unit 82 is positioned to extend from the second carrier C2 in the second axial direction L2.

[0098] 5. Other Embodiments (1) In the above embodiment, a configuration in which the first member 1 is a non-rotating member NR was described as an example. However, the configuration is not limited to such a configuration, and the first member 1 may be configured to be rotatable relative to the non-rotating member NR. In other words, the engagement device 10 may be configured as a clutch instead of a brake. In this configuration, it is preferable to place a bearing between the first member 1 and the case housing the drive source 41 and the reduction mechanism 43.

[0099] (2) In the above embodiment, a configuration in which the vehicle drive unit 100 is equipped with the engagement device 10 according to the first embodiment was described as an example. However, the vehicle drive unit 100 may be equipped with the engagement device 10 according to the second embodiment, for example.

[0100] (3) The configurations disclosed in each of the embodiments described above can be applied in combination with configurations disclosed in other embodiments, as long as no inconsistencies arise. With regard to 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 this disclosure. [Industrial applicability]

[0101] The technology relating to this disclosure can be used in an engagement device comprising an engagement mechanism for selectively engaging a first member and a second member, and a drive device for driving the engagement mechanism, and in a vehicle drive device equipped therewith. [Explanation of symbols]

[0102] 100: Vehicle drive unit, 10: Engagement device, 1: First member, 11: First radially extending part, 111: Regulating part, 112: Axial support part, 2: Second member, 3: Engagement mechanism, 31: First friction engagement element, 32: Second friction engagement element, 33: Pressing member, 34: First support part, 35: Second support part, 4: Drive unit, 41: Drive source, 42: Linear motion conversion mechanism, L: Axial direction, L1: First axial side, L2: Second axial side, R: Radial direction

Claims

1. First member and A second member is supported so as to be rotatable relative to the first member, An engagement mechanism for selectively engaging the first member and the second member, An engagement device comprising a drive device for driving the engagement mechanism, The direction along the rotation axis of the second member is defined as the axial direction, one side in the axial direction is defined as the axial first side, the other side in the axial direction is defined as the axial second side, and the direction perpendicular to the axial direction is defined as the radial direction. The engagement mechanism comprises a first friction engagement element, a second friction engagement element arranged to face the first friction engagement element in the axial direction, a pressing member that presses the first friction engagement element and the second friction engagement element from the first axial side, a first support portion that supports the first friction engagement element, and a second support portion that supports the second friction engagement element. The pressing member is supported so as to be non-rotatable with respect to the first member and movable in the axial direction. Each of the first support portion and the second support portion is formed in a cylindrical shape along the axial direction, The first support portion is provided on the first member or a member that is non-rotatably supported with respect to the first member. The second support portion is provided on the second member so as to be located radially outward from the first support portion, The first friction engagement element is supported so as to be non-rotatable with respect to the first support and movable in the axial direction, The second friction engagement element is supported so as to be non-rotatable with respect to the second support and movable in the axial direction, The drive device comprises a drive source and a linear motion conversion mechanism that converts the rotational driving force of the drive source into an axial driving force and transmits it to the pressing member. The first member includes a first radially extending portion that extends along the radial direction, The first radially extending portion comprises a restricting portion positioned on the second axial side with respect to the first and second friction engagement elements to restrict the movement of the first and second friction engagement elements toward the second axial side, and an axial support portion positioned radially inward from the restricting portion to support the linear motion conversion mechanism in the axial direction. The linear motion conversion mechanism is positioned radially inward from the first friction engagement element and the second friction engagement element, and overlaps with the first friction engagement element and the second friction engagement element in a radial view along the radial direction. The pressing member presses the first friction engagement element and the second friction engagement element from the first axial side, and the restricting portion supports the first friction engagement element and the second friction engagement element from the second axial side, thereby causing the engagement mechanism to enter an engaged state. The first member is a non-rotating member further comprising: a second radially extending portion that is positioned on the first axial side with respect to the pressing member and extends along the radial direction; and a connecting portion that is positioned radially outward with respect to the second support portion and extends along the axial direction to connect the first radially extending portion and the second radially extending portion. The second member comprises a third radially extending portion disposed between the second radially extending portion and the pressing member in the axial direction and extending radially inward from the second support portion, and an axial portion disposed radially inward from the second radially extending portion and extending axially inward from the third radially extending portion toward the first side, An engagement device in which a support bearing is disposed between the inner circumferential surface of the second radially extending portion and the outer circumferential surface of the shaft-shaped portion for rotatably supporting the shaft-shaped portion with respect to the second radially extending portion.

2. The linear motion conversion mechanism includes a supported portion that is supported from the first axial side in the axial direction in the axial support portion, The restricting portion is provided with a first support surface facing the first axial side at a position that overlaps with the first friction engagement element and the second friction engagement element in an axial view along the axial direction, The axial support portion is provided with a second support surface facing the second axial side at a position that overlaps with the supported portion in the axial view, The engagement device according to claim 1, wherein the supported portion is arranged to overlap with the regulating portion in a radial view.

3. The drive device further comprises a reduction mechanism that reduces the rotation of the drive source and transmits it to the linear motion conversion mechanism. The linear motion conversion mechanism includes a transmission member that transmits rotation from the drive source via the reduction mechanism, The transmission member is arranged coaxially with the second member, The aforementioned drive source is an electric motor, which is arranged on a separate shaft from the transmission member. The engagement device according to claim 1 or 2, wherein the axial arrangement region of the drive source overlaps with the axial arrangement region of the linear motion conversion mechanism.

4. An engagement device according to any one of claims 1 to 3, A rotating electric machine equipped with a rotor, An output member driven and connected to the wheel, The system includes a reduction gear that reduces the rotation of the rotor and transmits it to the output member, The first member is a non-rotating member, The second member is connected to the rotor so as to rotate integrally with it, in a vehicle drive system.

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