Clutch device

Abstract

A clutch device (10) is provided with a clutch housing (30) that rotates integrally with an input gear (35) and holds a plurality of input-side rotating plates (20). The clutch housing (30) is provided with: a first groove (36) that is provided in a side wall (33) and holds the plurality of input-side rotating plates (20); a second groove section (37) that is provided in the side wall (33), is adjacent to the first groove section (36) in the circumferential direction (S), and holds an outermost input-side rotating plate (20X), among the plurality of input-side rotating plates (20), which is located closest to the first direction (D1) side; and a third groove section (38) that is recessed in the second direction (D2) from an end section (37D2) of the second groove section (37) in the second direction (D2) and does not hold the input-side rotating plate (20) and the outermost input-side rotating plate (20X).

Description

[0001] Cross-reference of related applications

[0002] This application claims priority based on Japanese Patent Application No. 2024-87038, filed on May 29, 2024; Japanese Patent Application No. 2024-213330, filed on December 6, 2024; and Japanese Patent Application No. 2024-213331, filed on December 6, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to clutch devices. Background Technology

[0004] Motorized two-wheeled vehicles and other straddle-type vehicles are equipped with clutch devices capable of transmitting and disconnecting the rotational driving force of a power source such as an engine to the drive wheels. For example, Japanese Patent No. 4648237 discloses a wet multi-plate clutch (hereinafter referred to as a clutch device) which includes: an input gear that meshes with the drive gear of the engine; an external clutch component (hereinafter referred to as a clutch housing) that rotates integrally with the input gear; an internal clutch component (hereinafter referred to as a clutch center portion) that is connected to the output shaft; and a pressure plate (hereinafter referred to as a pressure plate) that can approach or move away from the clutch center portion.

[0005] The clutch housing disclosed in Japanese Patent No. 4648237 has multiple main spline grooves that hold the drive friction plate (hereinafter referred to as the input side rotating plate) and auxiliary spline grooves that hold the outermost input side rotating plate (hereinafter referred to as the outermost input side rotating plate) in the circumferential direction.

[0006] However, in the clutch housing disclosed in Japanese Patent No. 4648237, to enhance rigidity, the front ends of multiple fins are connected together as a single unit using an annular connecting portion. Furthermore, the auxiliary spline groove holding the outermost input-side rotating plate is formed by hollowing out a portion of the fins. Therefore, the clutch housing becomes relatively heavy. Additionally, since the clutch oil circulates within the clutch housing, it is preferable to ensure smoother circulation of the clutch oil between the inside and outside of the clutch housing.

[0007] The present invention was made in view of this point, and its object is to provide a clutch device that enables the clutch housing to be lightweight and allows for smoother circulation of clutch oil. Summary of the Invention

[0008] The clutch device of the present invention is a clutch device that transmits or cuts off the rotational driving force of an input shaft to an output shaft. It comprises: a clutch housing that rotates integrally with a gear that is rotated by the rotational drive of the input shaft and holds a plurality of input-side rotating plates; a clutch central portion housed in the clutch housing and rotated together with the output shaft; and a pressure plate configured to be approachable or separable from the clutch central portion and to rotate relative to it, and capable of pressing against the input-side rotating plates and a plurality of output-side rotating plates alternately arranged with the input-side rotating plates. The clutch housing comprises: an annular bottom wall on which the gear is mounted; and side walls that, in the axial direction of the output shaft, have a first direction from one side to the other and a direction from the other side to one side... In the second direction, the sidewall extends from the outer periphery of the bottom wall toward the first direction; a first groove is provided on the sidewall and recessed from the end of the sidewall in the first direction toward the second direction, and at least a portion of it extends radially through, and holds a plurality of input-side rotating plates; a second groove is provided on the sidewall and adjacent to the first groove in the circumferential direction, and recessed from the end of the sidewall in the first direction toward the second direction, and holds at least the outermost input-side rotating plate located closest to the first direction side among the plurality of input-side rotating plates; and a third groove is provided on the sidewall and recessed from the end of the second groove in the second direction toward the second direction, and at least a portion of it extends radially through, and does not hold the input-side rotating plate and the outermost input-side rotating plate.

[0009] According to the clutch device of the present invention, a first groove holding multiple input-side rotating plates is recessed from the end of the sidewall in a first direction toward a second direction, and at least a portion of it extends radially. A second groove holding the outermost input-side rotating plate is recessed from the end of the sidewall in the first direction toward a second direction. Furthermore, a third groove not holding the input-side rotating plates and the outermost input-side rotating plate is recessed from the end of the second groove in a second direction toward a second direction, and at least a portion of it extends radially. According to the above solution, by providing the first, second, and third grooves in the sidewall, the clutch housing is made lighter. Furthermore, in addition to the first groove, the third groove also extends radially, thus allowing for smoother circulation of clutch oil between the inside and outside of the clutch housing.

[0010] According to the present invention, a clutch device can be provided that enables the clutch housing to be lightweight and the clutch oil to circulate more smoothly. Attached Figure Description

[0011] Figure 1 This is a cross-sectional view of a clutch device according to one embodiment.

[0012] Figure 2 This is a top view of the input-side rotating plate according to one embodiment.

[0013] Figure 3 This is a perspective view of a clutch housing according to one embodiment.

[0014] Figure 4 This is a top view of a clutch housing according to one embodiment.

[0015] Figure 5 yes Figure 4 The V-view.

[0016] Figure 6 yes Figure 4 The VI view.

[0017] Figure 7 This is a perspective view of the central portion of the clutch in one embodiment.

[0018] Figure 8 This is a perspective view of the central portion of the clutch in one embodiment.

[0019] Figure 9 This is a perspective view of the pressure plate in one embodiment.

[0020] Figure 10A This is a schematic diagram illustrating the function of the central side auxiliary cam surface and the pressure side auxiliary cam surface.

[0021] Figure 10B This is a schematic diagram illustrating the function of the central sliding member cam surface and the pressure sliding member cam surface.

[0022] Figure 11 This is a perspective view of a clutch housing according to another embodiment.

[0023] Figure 12 This is a top view of the clutch housing according to another embodiment.

[0024] Figure 13 yes Figure 12 The XIII view.

[0025] Figure 14 yes Figure 12 XIV view.

[0026] Figure 15 yes Figure 12 XV view. Detailed Implementation

[0027] Hereinafter, embodiments of the clutch device of the present invention will be described with reference to the accompanying drawings. It should be noted that the embodiments described herein are not intended to specifically limit the present invention. Furthermore, components and parts that perform the same function are labeled with the same reference numerals, and repeated descriptions are omitted or simplified where appropriate.

[0028] <First Implementation Method>

[0029] Figure 1 This is a cross-sectional view of the clutch device 10 according to the first embodiment. The clutch device 10 is installed, for example, in a vehicle such as a motorized two-wheeled vehicle. The clutch device 10 is, for example, a device that transmits or cuts off the rotational driving force of the input shaft (crankshaft) of the motorized two-wheeled vehicle's engine to the output shaft 15. The clutch device 10 is a device for transmitting or cutting off the rotational driving force of the input shaft to the drive wheel (rear wheel) via the output shaft 15. The clutch device 10 is disposed between the engine and the transmission. The clutch device 10 includes an input gear 35, a clutch housing 30, a clutch central portion 40, a pressure plate 70, and a lifting plate 100.

[0030] In the following description, the axial direction of the output shaft 15 is defined as direction D, the direction from one side to the other in direction D is defined as the first direction D1, and the direction from the other side to one side in direction D is defined as the second direction D2. Furthermore, the circumferential direction of the clutch center portion 40 and the pressure plate 70 is defined as circumferential direction S, and the direction from one side to the other in circumferential direction S is defined as the first circumferential direction S1 (see reference). Figure 3 The direction from one side to the other in the circumferential direction S will be designated as the second circumferential direction S2 (refer to...). Figure 3 In this embodiment, the axial direction of the clutch housing 30, the axial direction of the clutch central portion 40, and the axial direction of the pressure plate 70 are the same as direction D. Furthermore, the pressure plate 70 and the clutch central portion 40 rotate along the first circumferential direction S1. However, the above-described directions are merely for ease of explanation and do not limit the arrangement of the clutch device 10, nor do they limit the present invention.

[0031] like Figure 1 As shown, the output shaft 15 is a hollow shaft. The end of the output shaft 15 on the first direction D1 side supports the input gear 35 and the clutch housing 30 for free rotation via a bearing 15A. The output shaft 15 fixedly supports the clutch center portion 40 via a collar 15C and a nut 15N. That is, the output shaft 15 and the clutch center portion 40 rotate integrally. The end of the output shaft 15 on the second direction D2 side is connected, for example, to the transmission (not shown) of a two-wheeled motor vehicle.

[0032] The clutch housing 30 is formed of aluminum alloy. The clutch housing 30 is formed in a bottomed cylindrical shape. For example... Figure 3As shown, the clutch housing 30 has an annular bottom wall 31 and side walls 33 extending from the outer periphery of the bottom wall 31 in a first direction D1. The clutch housing 30 holds a plurality of input-side rotating plates 20 (see reference). Figure 2 The clutch housing 30 will be described in detail later.

[0033] like Figure 1 As shown, an input gear 35 is mounted on the bottom wall 31 of the clutch housing 30. The input gear 35 is fixed to the bottom wall 31 by rivets 35B via a torque damper 35A. The input gear 35 meshes with a drive gear (not shown) that rotates via the rotational drive of the engine's input shaft. The input gear 35 is rotated by the rotational drive of the input shaft. The input gear 35 rotates integrally with the clutch housing 30, independent of the output shaft 15. The input gear 35 is an example of a gear.

[0034] like Figure 1 As shown, the input-side rotating plate 20 is held in the clutch housing 30. The input-side rotating plate 20 is configured to be displaceable along the axial direction (i.e., direction D) of the clutch housing 30. The input-side rotating plate 20 is rotated by the rotation of the input shaft. The input-side rotating plate 20 is configured to rotate integrally with the clutch housing 30.

[0035] The input-side rotating plate 20 is a component that presses against the output-side rotating plate 22. For example... Figure 2 As shown, the input-side rotating plate 20 has an annular main body 20A and multiple claw portions 20B extending radially outward from the outer periphery of the main body 20A. The input-side rotating plate 20 is formed by aluminum die casting. The input-side rotating plate 20 has multiple friction elements 20C disposed on the surface and back surface of the main body 20A. The friction elements 20C are made of paper. The multiple friction elements 20C are arranged at equal intervals in the circumferential direction S. The input-side rotating plate 20 has multiple oil grooves 20D formed between adjacent friction elements 20C. The oil grooves 20D are grooves for retaining clutch oil. The depth of the oil grooves 20D is tens of μm to hundreds of μm.

[0036] like Figure 3 and Figure 4 As shown, the clutch housing 30 includes a first groove 36. The first groove 36 is provided in the side wall 33. The first groove 36 is recessed from an end 33D1 in a first direction D1 towards a second direction D2 of the side wall 33. The first groove 36 extends radially through the side wall 33. A plurality of first grooves 36 are equally spaced in the circumferential direction S. The first grooves 36 hold a plurality of input-side rotating plates 20. The claws 20B of the input-side rotating plates 20 engage with the first grooves 36. Figure 1 As shown, in this embodiment, the first groove 36 holds three input-side rotating plates 20, but is not limited to three.

[0037] like Figure 3 and Figure 4 As shown, the clutch housing 30 includes a second groove 37. The second groove 37 is provided on the side wall 33. The second groove 37 is adjacent to the first groove 36 in the circumferential direction S. The second groove 37 and the first groove 36 are alternately arranged in the circumferential direction S. The second groove 37 is recessed from its end 33D1 in a first direction D1 towards a second direction D2 of the side wall 33. The second groove 37 extends radially through the side wall 33. A plurality of second grooves 37 are provided at equal intervals in the circumferential direction S. Figure 1 As shown, the second groove 37 holds the outermost input-side rotating plate 20X, which is located closest to the first direction D1 among the plurality of input-side rotating plates 20. The second groove 37 holds only the outermost input-side rotating plate 20X among the plurality of input-side rotating plates 20. The claw portion 20B of the outermost input-side rotating plate 20X engages with the second groove 37. It should be noted that the outermost input-side rotating plate 20X does not engage with the first groove 36.

[0038] like Figure 3 and Figure 4 As shown, the clutch housing 30 includes a third groove 38. The third groove 38 is provided on the side wall 33. The third groove 38 is adjacent to the first groove 36 in the circumferential direction S. The third groove 38 is recessed from the end of the second groove 37 in the second direction D2. The third groove 38 is continuous with the second groove 37. The third groove 38 extends radially through the side wall 33. A plurality of third grooves 38 are provided at equal intervals in the circumferential direction S. Figure 1 As shown, the third groove 38 does not hold the plurality of input-side rotating plates 20 and the outermost input-side rotating plate 20X. The claw portion 20B of the input-side rotating plate 20 does not engage with the third groove 38.

[0039] like Figure 3 and Figure 4 As shown, the clutch housing 30 includes a fourth groove 39. The fourth groove 39 is provided on the sidewall 33. The fourth groove 39 is adjacent to the first groove 36 in the circumferential direction S. At least a portion of the fourth groove 39 is recessed from the end of the third groove 38 in the second direction D2. In this embodiment, a portion of the fourth groove 39 is located to the side of the third groove 38 in the circumferential direction S. The fourth groove 39 is continuous with the third groove 38. The fourth groove 39 is radially recessed. The fourth groove 39 is recessed from the radially inner side of the sidewall 33 toward the radially outer side. The fourth groove 39 does not penetrate the sidewall 33. A plurality of fourth grooves 39 are provided at equal intervals in the circumferential direction S. Figure 1 As shown, the fourth groove 39 does not hold the plurality of input-side rotating plates 20 and the outermost input-side rotating plate 20X. The claw portion 20B of the input-side rotating plate 20 does not engage with the fourth groove 39.

[0040] like Figure 3 As shown, the clutch housing 30 includes a stepped portion 34 disposed between the second groove 37 and the third groove 38. The stepped portion 34 is configured to contact a portion of the outermost input-side rotating plate 20X.

[0041] like Figure 5 and Figure 6 As shown, the length P2 of the second groove 37 in the circumferential direction S is shorter than the length P1 of the first groove 36 in the circumferential direction S. The length P3 of the third groove 38 in the circumferential direction S is shorter than the length P1 of the first groove 36 in the circumferential direction S. The length P3 of the third groove 38 in the circumferential direction S is shorter than the length P2 of the second groove 37 in the circumferential direction S. The length P3 of the third groove 38 in the circumferential direction S is shorter than the length P4 of the fourth groove 39 in the circumferential direction S. The length P4 of the fourth groove 39 in the circumferential direction S is shorter than the length P1 of the first groove 36 in the circumferential direction S. The length P4 of the fourth groove 39 in the circumferential direction S is shorter than the length P2 of the second groove 37 in the circumferential direction S. It should be noted that the length P2 can be shorter than the length P3, or the same. The length P4 can be shorter than the length P3, or the same. In this embodiment, the lengths P1 and P2 are shorter than the length P5 of the claw portion 20B of the input-side rotating plate 20 in the circumferential direction S (refer to...). Figure 2 ( ) is longer. Length P3 is shorter than length P5.

[0042] like Figure 5 and Figure 6 As shown, when the length from the end 33D1 of the first direction D1 of the sidewall 33 to the end 36D2 of the second direction D2 of the first groove 36 is set as L1, the length from the end 33D1 of the first direction D1 of the sidewall 33 to the end 37D2 of the second direction D2 of the second groove 37 is set as L2, the length from the end 33D1 of the first direction D1 of the sidewall 33 to the end 38D2 of the second direction D2 of the third groove 38 is set as L3, and the length from the end 33D1 of the first direction D1 of the sidewall 33 to the end 39D2 of the second direction D2 of the fourth groove 39 is set as L4, the relationship L1 > L4 > L3 > L2 is satisfied. The length L2 is shorter than the length L5 (i.e., the length in the direction D of the third groove 38) from the end 37D2 of the second direction D2 of the second groove 37 to the end 38D2 of the second direction D2 of the third groove 38.

[0043] like Figure 1As shown, the clutch central portion 40 is housed within the clutch housing 30. The clutch central portion 40 is concentrically arranged with the clutch housing 30. The clutch central portion 40 has a cylindrical body 42 and a flange 68 extending radially outward from the outer periphery of the body 42. The body 42 protrudes further in the second direction D2 than the flange 68. The clutch central portion 40 holds a plurality of output-side rotating plates 22 that are alternately arranged with the input-side rotating plates 20 in the direction D. The clutch central portion 40 is rotated together with the output shaft 15.

[0044] like Figure 7 As shown, the main body 42 includes: an output shaft holding portion 50 disposed at the center of the main body 42; an outer peripheral wall 45 located radially outward from the output shaft holding portion 50; and a plurality of central side cam portions 60 connected to the output shaft holding portion 50 and the outer peripheral wall 45.

[0045] like Figure 7 As shown, the output shaft holding portion 50 is cylindrical. The output shaft holding portion 50 extends along the second direction D2. The end of the output shaft holding portion 50 on the second direction D2 side is located closer to the second direction D2 side than the central cam portion 60. An insertion hole 51 is formed through the output shaft holding portion 50 for the output shaft 15 to be inserted and splined into. Multiple spline grooves are formed along the axial direction on the inner circumferential surface 50A of the insertion hole 51 in the output shaft holding portion 50. The output shaft 15 is connected to the output shaft holding portion 50.

[0046] like Figure 7 As shown, a splined engagement portion 46 is provided on the outer peripheral surface 45A of the outer peripheral wall 45. The splined engagement portion 46 has: a plurality of central-side engagement teeth 47 extending axially along the outer peripheral surface 45A of the outer peripheral wall 45 in the clutch central portion 40; and a plurality of spline grooves 48 formed between adjacent central-side engagement teeth 47 and extending axially in the clutch central portion 40. The central-side engagement teeth 47 hold the output-side rotating plate 22. The plurality of central-side engagement teeth 47 are arranged circumferentially in the direction S. The plurality of central-side engagement teeth 47 are formed at equal intervals in the circumferential direction S. The plurality of central-side engagement teeth 47 are formed with the same shape. The central-side engagement teeth 47 protrude radially outward from the outer peripheral surface 45A of the outer peripheral wall 45.

[0047] The output-side rotating plate 22 is held in the spline engagement portion 46 of the clutch center portion 40 and the spline engagement portion 76 of the pressure plate 70 (described later). A portion of the output-side rotating plate 22 is held in the center-side engagement teeth 47 and spline groove 48 of the clutch center portion 40 by spline engagement. Another portion of the output-side rotating plate 22 is held in the pressure-side engagement teeth 77 of the pressure plate 70 (described later) by spline engagement. Figure 9 ) and spline groove 78 (refer to) Figure 9The output-side rotating plate 22 is configured to be axially displaceable along the clutch center portion 40. The output-side rotating plate 22 is configured to rotate integrally with the clutch center portion 40.

[0048] The output-side rotating plate 22 is a component that presses against the input-side rotating plate 20. The output-side rotating plate 22 is formed in a ring shape. The output-side rotating plate 22 is formed by punching a thin sheet of SPCC material into a ring shape. It should be noted that the friction element 20C (see reference) is provided on the input-side rotating plate 20. Figure 2 It can also be set on the output side rotating plate 22 instead of the input side rotating plate 20, or it can be set on the input side rotating plate 20 and the output side rotating plate 22 respectively.

[0049] The central side cam portion 60 is formed in the shape of a platform with a cam surface. This cam surface is composed of an inclined surface constituting an assist sliding mechanism. This assist sliding mechanism generates an assist torque, which increases the pressing force (clamping force) between the input side rotating plate 20 and the output side rotating plate 22, or a sliding torque, which causes the input side rotating plate 20 and the output side rotating plate 22 to separate prematurely and transition to a semi-engaged state. The central side cam portion 60 is formed on the main body 42. The end of the central side cam portion 60 on the second direction D2 side is located closer to the second direction D2 side than the outer peripheral wall 45. The central side cam portions 60 are equally spaced along the circumferential S of the clutch central portion 40. In this embodiment, the clutch central portion 40 has three central side cam portions 60, but the number of central side cam portions 60 is not limited to three.

[0050] like Figure 7As shown, the central-side cam portion 60 is located radially outward of the output shaft holding portion 50. The central-side cam portion 60 has a central-side auxiliary cam surface 60A and a central-side sliding cam surface 60S. The central-side auxiliary cam surface 60A is configured to generate a force from the pressure plate 70 toward the clutch central portion 40 when the clutch central portion 40 rotates relative to the pressure plate 70, thereby increasing the pressing force (clamping force) between the input-side rotating plate 20 and the output-side rotating plate 22. In this embodiment, when the above-mentioned force is generated, the position of the pressure plate 70 relative to the clutch central portion 40 does not change, and the pressure plate 70 does not need to be physically close to the clutch central portion 40. It should be noted that the pressure plate 70 may also be physically displaced relative to the clutch central portion 40. The central-side sliding cam surface 60S is configured to separate the pressure plate 70 from the clutch central portion 40 when the clutch central portion 40 rotates relative to the pressure plate 70, thereby reducing the pressing force (clamping force) between the input-side rotating plate 20 and the output-side rotating plate 22. In the adjacent central side cam portions 60 in the circumferential direction S, the central side auxiliary cam surface 60A of one central side cam portion 60L and the central side sliding cam surface 60S of the other central side cam portion 60M are arranged opposite each other in the circumferential direction S.

[0051] like Figure 8 As shown, the central portion 40 of the clutch includes a spring receiving portion 54. The spring receiving portion 54 is formed in the main body 42. More specifically, the spring receiving portion 54 is formed in the central side cam portion 60. The spring receiving portion 54 houses the pressure spring 25 (see reference). Figure 1 In this embodiment, the clutch central portion 40 includes three spring receiving portions 54. The three spring receiving portions 54 are arranged at equal intervals along the circumferential direction S of the clutch central portion 40. It should be noted that the number of spring receiving portions 54 is not limited to three. The spring receiving portions 54 are located on the second circumferential direction S2 side closer to the central portion side sliding cam surface 60S. The spring receiving portions 54 are located on the first circumferential direction S1 side closer to the central portion side auxiliary cam surface 60A.

[0052] like Figure 1 As shown, the pressure spring 25 is housed in the spring housing portion 54. The end 25D1 of the pressure spring 25 in the first direction D1 contacts the lifting plate 100. The end 25D2 of the pressure spring 25 in the second direction D2 contacts the clutch center portion 40. The pressure spring 25 applies force to the pressure plate 70 in the direction D toward the clutch center portion 40 (i.e., the first direction D1). The pressure spring 25 is, for example, a helical spring made by winding spring steel into a spiral shape.

[0053] like Figure 7 and Figure 8As shown, the clutch central portion 40 has a central side cam hole 43H that penetrates a portion of the main body 42. The central side cam hole 43H penetrates the main body 42 in direction D. The central side cam hole 43H extends from the side of the output shaft holding portion 50 to the outer peripheral wall 45. The central side cam hole 43H is formed between the central side auxiliary cam surface 60A and the central side sliding cam surface 60S of the adjacent central side cam portion 60. The central side cam hole 43H supplies the boss portion 84 of the pressure plate 70 (described later) in the central side cam hole 70. Figure 9 Insertion. When viewed axially from the center portion 40 of the clutch, the auxiliary cam surface 60A on the center portion side overlaps with a portion of the cam hole 43H on the center portion side.

[0054] like Figure 1 As shown, a pressure plate 70 is housed within a clutch housing 30. The pressure plate 70 is located between the clutch housing 30 and the clutch center portion 40. The pressure plate 70 is configured to be movable in direction D. The pressure plate 70 is configured to be able to approach or separate relative to the clutch center portion 40 and to rotate relative to it. The pressure plate 70 is configured to press down on the input-side rotating plate 20 and the output-side rotating plate 22. The pressure plate 70 is concentrically disposed with the clutch center portion 40 and the clutch housing 30. The pressure plate 70 has a main body 72 and a flange 98 that connects to the outer periphery of the main body 72 in a second direction D2 and extends radially outward. The main body 72 protrudes further in the first direction D1 than the flange 98. The pressure plate 70 holds a plurality of output-side rotating plates 22 that are alternately disposed with the input-side rotating plate 20.

[0055] like Figure 9 As shown, the main body 72 has an annular base wall 73, a fitting hole 80 disposed in the center of the base wall 73, an outer peripheral wall 75 located radially outward of the base wall 73 and extending toward the first direction D1, and a plurality of pressure-side cam portions 90 connected to the base wall 73 and the outer peripheral wall 75.

[0056] like Figure 9 As shown, flange 98 extends radially outward from the outer periphery of body 72. Flange 98, together with flange 68 of clutch center portion 40, clamps input-side rotating plate 20 and output-side rotating plate 22. Flange 98 is a member that applies pressing pressure to input-side rotating plate 20 and output-side rotating plate 22.

[0057] like Figure 9 As shown, a fitting hole 80 is formed in the center of the main body 72. The fitting hole 80 penetrates the base wall 73 in the direction D. The output shaft retaining part 50 of the clutch central part 40 is inserted into the fitting hole 80.

[0058] like Figure 9As shown, a splined fitting portion 76 is provided on the outer peripheral surface 75A of the outer peripheral wall 75. The splined fitting portion 76 has: a plurality of pressure-side fitting teeth 77 extending axially along the outer peripheral surface 75A of the outer peripheral wall 75 in the pressure plate 70; and a plurality of spline grooves 78 formed between adjacent pressure-side fitting teeth 77 and extending axially in the pressure plate 70. The pressure-side fitting teeth 77 hold the output-side rotating plate 22. The plurality of pressure-side fitting teeth 77 are arranged circumferentially in the direction S. The plurality of pressure-side fitting teeth 77 are formed with the same shape. The pressure-side fitting teeth 77 protrude radially outward from the outer peripheral surface 75A of the outer peripheral wall 75.

[0059] The pressure-side cam portion 90 is formed in a platform shape with a cam surface, which is composed of an inclined surface of an assist sliding mechanism that slides on the central side cam portion 60 to generate auxiliary torque or sliding torque. The pressure-side cam portion 90 is formed to protrude from the flange 98 in the first direction D1. Figure 9 As shown, the pressure-side cam portions 90 are arranged at equal intervals along the circumferential direction S of the pressure plate 70. In this embodiment, the pressure plate 70 has three pressure-side cam portions 90, but the number of pressure-side cam portions 90 is not limited to three.

[0060] like Figure 9 As shown, the pressure-side cam portion 90 is located radially outside the engagement hole 80. The pressure-side cam portion 90 has a pressure-side auxiliary cam surface 90A and a pressure-side sliding cam surface 90S. The pressure-side auxiliary cam surface 90A is configured to contact the central-side auxiliary cam surface 60A. The pressure-side auxiliary cam surface 90A is configured to generate a force from the pressure plate 70 toward the clutch central portion 40 in order to increase the pressing force (clamping force) between the input-side rotating plate 20 and the output-side rotating plate 22 when the pressure plate 70 rotates relative to the clutch central portion 40. The pressure-side sliding cam surface 90S is configured to contact the central-side sliding cam surface 60S. The pressure-side sliding cam surface 90S is configured to separate the pressure plate 70 from the clutch central portion 40 in order to reduce the pressing force (clamping force) between the input-side rotating plate 20 and the output-side rotating plate 22 when the pressure plate 70 rotates relative to the clutch central portion 40. In the adjacent pressure-side cam portions 90 on the circumferential S, the pressure-side auxiliary cam surface 90A of one pressure-side cam portion 90L and the pressure-side sliding cam surface 90S of the other pressure-side cam portion 90M are arranged opposite each other on the circumferential S.

[0061] Here, the functions of the central side cam 60 and the pressure side cam 90 are explained. When the engine speed increases to a state where the rotational driving force input to the input gear 35 and the clutch housing 30 can be transmitted to the output shaft 15 via the clutch central section 40, as... Figure 10AAs shown, a first circumferential rotational force S1 is applied to the pressure plate 70. Therefore, through the action of the central auxiliary cam surface 60A and the pressure-side auxiliary cam surface 90A, a force in the first direction D1 is generated on the pressure plate 70. This increases the pressing force between the input-side rotating plate 20 and the output-side rotating plate 22.

[0062] On the other hand, when the output shaft 15 rotates faster than the input gear 35 and the clutch housing 30, generating a reverse torque, such as Figure 10B As shown, a first circumferential rotational force S1 is applied to the central portion 40 of the clutch. Therefore, through the action of the central portion sliding cam surface 60S and the pressure sliding cam surface 90S, the pressure plate 70 moves in the second direction D2, releasing the pressing force between the input-side rotating plate 20 and the output-side rotating plate 22. This avoids adverse effects on the engine and transmission caused by reverse torque.

[0063] like Figure 9 As shown, the pressure plate 70 has a pressure-side cam hole 73H that penetrates a portion of the base wall 73. The pressure-side cam hole 73H penetrates the base wall 73 along direction D. The pressure-side cam hole 73H is located radially outward from the fitting hole 80. The pressure-side cam hole 73H extends from the side of the fitting hole 80 to the outer peripheral wall 75. The pressure-side cam hole 73H is formed between adjacent pressure-side cam portions 90. The pressure-side cam hole 73H is formed between the pressure-side auxiliary cam surface 90A and the pressure-side sliding cam surface 90S of the adjacent pressure-side cam portion 90. When viewed axially from the pressure plate 70, the pressure-side auxiliary cam surface 90A overlaps with a portion of the pressure-side cam hole 73H.

[0064] like Figure 9 As shown, the pressure plate 70 has a plurality of (three in this embodiment) bosses 84. The bosses 84 are arranged at equal intervals in the circumferential direction S. The bosses 84 are cylindrical. The bosses 84 are located radially outward from the fitting hole 80. The bosses 84 extend from the base wall 73 in the first direction D1. The bosses 84 are disposed on the pressure-side cam portion 90. The bosses 84 are located in the circumferential direction S between the pressure-side auxiliary cam surface 90A and the pressure-side sliding cam surface 90S. The bosses 84 are inserted into the central side cam hole 43H (see reference). Figure 1 A bolt 28 is formed in the boss portion 84 (see reference). Figure 1 The threaded hole 84H is inserted. The threaded hole 84H extends axially along the pressure plate 70.

[0065] like Figure 1As shown, the lifting plate 100 is a component used to displace the pressure plate 70 in direction D. The lifting plate 100 is fixed to the pressure plate 70 by bolts 28. The lifting plate 100 rotates integrally with the pressure plate 70. The lifting plate 100 moves integrally with the pressure plate 70 in direction D. The lifting plate 100 moves relative to the clutch center portion 40 in direction D and rotates relative to the clutch center portion 40. The lifting plate 100 is operated by a clutch disengagement mechanism (not shown). Here, the clutch disengagement mechanism is a mechanical device that operates in a motorized two-wheeled vehicle or similar vehicle equipped with a clutch device 10 by the operation of the driver's clutch operating lever (not shown).

[0066] As described above, in the clutch device 10 of this embodiment, a first groove 36 holding multiple input-side rotating plates 20 is recessed from the end 33D1 in the first direction D1 of the sidewall 33 toward the second direction D2 and extends radially. A second groove 37 holding the outermost input-side rotating plate 20X is recessed from the end 33D1 in the first direction D1 of the sidewall 33 toward the second direction D2. A third groove 38 not holding the input-side rotating plates 20 and the outermost input-side rotating plate 20X is recessed from the end 37D2 in the second direction D2 of the second groove 37 toward the second direction D2 and extends radially. By providing the first groove 36, the second groove 37, and the third groove 38 in the sidewall 33, the clutch housing 30 is made lighter. Furthermore, in addition to the first groove 36, the third groove 38 also extends radially, thus allowing for smoother circulation of clutch oil between the inside and outside of the clutch housing 30.

[0067] In the clutch device 10 of this embodiment, the clutch housing 30 includes a fourth groove 39 provided on the side wall 33, at least a portion of which is radially recessed from the end 38D2 of the third groove 38 in the second direction D2 towards the second direction D2. According to the above method, by providing the fourth groove 39 on the side wall 33, further weight reduction of the clutch housing 30 can be achieved. It should be noted that since the fourth groove 39 does not penetrate radially, the rigidity of the side wall 33 can be ensured.

[0068] In the clutch device 10 of this embodiment, the length P3 of the third groove 38 in the circumferential direction S is shorter than the length P2 of the second groove 37 in the circumferential direction S. According to this method, the rigidity of the sidewall 33 can be improved.

[0069] In the clutch device 10 of this embodiment, the length P3 of the third groove 38 in the circumferential direction S is shorter than the length P4 of the fourth groove 39 in the circumferential direction S. According to this method, the rigidity of the sidewall 33 can be improved.

[0070] In the clutch device 10 of this embodiment, the length P2 of the second groove 37 in the circumferential direction S, the length P3 of the third groove 38 in the circumferential direction S, and the length P4 of the fourth groove 39 in the circumferential direction S are shorter than the length P1 of the first groove 36 in the circumferential direction S. According to this arrangement, clutch oil circulation can be properly performed, and the rigidity of the sidewall 33 can be ensured.

[0071] In the clutch device 10 of this embodiment, the fourth groove 39 is recessed from the radially inner side toward the radially outer side. According to the above method, the clutch oil inside the clutch housing 30 can be accumulated in the fourth groove 39 and then discharged to the outside of the clutch housing 30, so that more clutch oil can be discharged to the outside of the clutch housing 30 via the fourth groove 39.

[0072] In the clutch device 10 of this embodiment, when the length from the end 33D1 of the sidewall 33 in the first direction D1 to the end 36D2 of the first groove 36 in the second direction D2 is set to L1, the length from the end 33D1 of the sidewall 33 in the first direction D1 to the end 37D2 of the second groove 37 in the second direction D2 is set to L2, the length from the end 33D1 of the sidewall 33 in the first direction D1 to the end 38D2 of the third groove 38 in the second direction D2 is set to L3, and the length from the end 33D1 of the sidewall 33 in the first direction D1 to the end 39D2 of the fourth groove 39 in the second direction D2 is set to L4, the relationship L1 > L4 > L3 > L2 is satisfied. According to the above method, multiple input-side rotating plates 20 can be retained in the clutch housing 30, and the clutch housing 30 can be made lighter.

[0073] In the clutch device 10 of this embodiment, the clutch housing 30 includes a stepped portion 34, which is disposed between the second groove portion 37 and the third groove portion 38, and is capable of contacting a portion of the outermost input-side rotating plate 20X. According to the above method, the outermost input-side rotating plate 20X can be more reliably held in the second groove portion 37.

[0074] In the clutch device 10 of this embodiment, at least a portion (in this case, the entirety of the second groove 37) extends radially through. This further reduces the weight of the clutch housing 30. Furthermore, since the second groove 37 also extends radially, the circulation of clutch oil between the interior and exterior of the clutch housing 30 is smoother.

[0075] <Second Implementation Method>

[0076] Figure 11This is a perspective view of the clutch housing 130 according to the second embodiment. It should be noted that the clutch device 10 of the second embodiment is the same as the clutch device 10 of the first embodiment, except that it has a clutch housing 130 instead of a clutch housing 30.

[0077] The clutch housing 130 is formed of aluminum alloy. The clutch housing 130 is formed in the shape of a bottomed cylinder. For example... Figure 11 As shown, the clutch housing 30 has an annular bottom wall 131, a side wall 133 extending from the outer periphery of the bottom wall 131 in a first direction D1, and an annular wall 140. The clutch housing 130 holds a plurality of input-side rotating plates 20 (see reference). Figure 2 ).

[0078] like Figure 11 and Figure 12 As shown, the annular wall 140 is disposed radially on the outer side of the side wall 133 of the output shaft 15. The annular wall 140 is continuous over the entire circumferential direction S. The outer circumferential surface of the annular wall 140 lies on the same circle centered on the shaft core of the output shaft 15, forming a smooth surface throughout the entire circumferential direction S. At least a portion of the annular wall 140 is located radially outside the end 133 D1 of the side wall 133 in the first direction D1. The annular wall 140 extends from a portion of the second groove 137 (described later) to a portion of the third groove 138. Figure 14 As shown, when viewed radially, the annular wall 140 overlaps with a portion of the second groove 137 and a portion of the third groove 138. When viewed radially, the annular wall 140 overlaps with the stepped portion 134, which will be described later.

[0079] like Figure 11 and Figure 12 As shown, the clutch housing 130 has a first groove 136. The first groove 136 is provided in the side wall 133. Figure 13 As shown, the first groove 136 is recessed from the end 133 D1 of the sidewall 133 in the first direction D1 toward the second direction D2. A portion of the first groove 136 extends radially through the sidewall 133. In this embodiment, the portion of the first groove 136 closer to the second direction D2 side than the annular wall 140 extends radially. A plurality of first grooves 136 are provided at equal intervals in the circumferential direction S. The first grooves 136 hold a plurality of input-side rotating plates 20. The claw portion 20B of the input-side rotating plate 20 (see reference) Figure 2 It engages with the first groove 136.

[0080] like Figure 11 and Figure 12 As shown, the clutch housing 130 includes a second groove 137. The second groove 137 is provided on the side wall 133. The second groove 137 is adjacent to the first groove 136 in the circumferential direction S. Figure 14As shown, the second groove 137 is alternately provided with the first groove 136 in the circumferential direction S. The second groove 137 is recessed from the end 133 D1 of the sidewall 133 in the first direction D1 toward the second direction D2. A portion of the second groove 137 extends radially through the sidewall 133. In this embodiment, the portion of the second groove 137 that is closer to the side of the annular wall 140 in the first direction D1 extends radially. A plurality of second grooves 137 are provided at equal intervals in the circumferential direction S. The second groove 137 holds the outermost input-side rotating plate 20X (refer to) located on the side closest to the first direction D1 among a plurality of input-side rotating plates 20. Figure 1 The second groove 137 holds only the outermost input-side rotating plate 20X among the plurality of input-side rotating plates 20. The claw portion 20B of the outermost input-side rotating plate 20X engages with the second groove 137. It should be noted that the outermost input-side rotating plate 20X does not engage with the first groove 136.

[0081] like Figure 11 and Figure 12 As shown, the clutch housing 130 includes a third groove 138. The third groove 138 is provided on the side wall 133. The third groove 138 is adjacent to the first groove 136 in the circumferential direction S. Figure 14 As shown, the third groove 138 is recessed from the end of the second groove 137 in the second direction D2. The third groove 138 is continuous with the second groove 137. A portion of the third groove 138 extends radially through the sidewall 133. In this embodiment, the portion of the third groove 138 closer to the second direction D2 side than the annular wall 140 extends radially. A plurality of third grooves 138 are provided at equal intervals in the circumferential direction S. The third groove 138 does not hold the plurality of input-side rotating plates 20 and the outermost input-side rotating plate 20X. The claw portion 20B of the input-side rotating plate 20 does not engage with the third groove 138.

[0082] like Figure 14 As shown, the clutch housing 130 includes a stepped portion 134 disposed between the second groove 137 and the third groove 138. The stepped portion 134 is configured to contact a portion of the outermost input-side rotating plate 20X.

[0083] like Figure 11 and Figure 12 As shown, the clutch housing 130 has a cutout 145. The cutout 145 is provided in the annular wall 140. Figure 15As shown, the cut portion 145 is recessed from the end 140D1 of the annular wall 140 in the first direction D1 toward the second direction. At least a portion of the cut portion 145 radially penetrates the sidewall 133. The cut portion 145 is located between adjacent first grooves 136 in the circumferential direction S. The cut portion 145 is located radially outside the second groove 137. When viewed radially, the cut portion 145 overlaps with a portion of the second groove 137. The cut portion 145 communicates with the second groove 137. The length H1 of the portion of the annular wall 140 in direction D where the cut portion 145 is formed is less than half the length H2 of the annular wall 140 in direction D. Figure 14 As shown, the length H2 in direction D of the annular wall 140 is longer than the length H3 from the end 133 D1 of the first direction D1 of the side wall 133 to the end 137 D2 of the second direction D2 of the second groove 137.

[0084] like Figure 13 and Figure 14 As shown, the length K1 of the first groove 136 in the circumferential direction S is longer than the length K2 of the second groove 137 in the circumferential direction S. The length K2 of the second groove 137 in the circumferential direction S is longer than the length K3 of the third groove 138 in the circumferential direction S. The length M of the cut portion 145 in the circumferential direction S is longer than the length K2 of the second groove 137 in the circumferential direction S. The length M of the cut portion 145 in the circumferential direction S is longer than the length K1 of the first groove 136 in the circumferential direction S. In this embodiment, the lengths K1 and K2 are longer than the length P5 of the claw portion 20B of the input-side rotating plate 20 in the circumferential direction S (see reference). Figure 2 The length K3 is shorter than the length P5. Therefore, the claw 20B can engage with the first groove 136 and the second groove 137, but cannot engage with the third groove 138.

[0085] In the clutch device 10 of this embodiment, the clutch housing 130 includes an annular wall 140 that is radially disposed on the outer side of the side wall 133 and is continuous throughout the entire circumferential direction S. According to the above method, the rigidity of the clutch housing 130 can be improved.

[0086] According to the clutch device 10 of this embodiment, the clutch housing 130 has a cutout 145 provided in the annular wall 140, recessed from the end 140 D1 of the annular wall 140 in a first direction D1 toward a second direction D2, and extending radially through at least a portion thereof. By providing the cutout 145 in the annular wall 140, the clutch housing 130 can be made lighter.

[0087] According to the clutch device 10 of this embodiment, the length M of the circumferential portion 145 in the cut-out portion 145 is longer than the length K2 of the circumferential portion 137 in the second groove portion 137. In this manner, the clutch housing 130 has a relatively large cut-out portion 145 in the annular wall 140, thus enabling the clutch housing 130 to be lightweight.

[0088] In the clutch device 10 of this embodiment, at least a portion of the annular wall 140 is located radially outward of the end 133D1 of the side wall 133 in the first direction D1. According to the above method, the rigidity of the end 133D1 of the side wall 133 in the first direction D1 can be improved.

[0089] In the clutch device 10 of this embodiment, a portion of the second groove 137 extends radially, and when viewed radially, the cutout 145 overlaps with a portion of the second groove 137. According to this arrangement, clutch oil can circulate between the interior and exterior of the clutch housing 130 via the cutout 145 and the second groove 137.

[0090] In the clutch device 10 of this embodiment, the annular wall 140 extends from a portion of the second groove 137 to a portion of the third groove 138. According to the above method, even with the third groove 138 provided, the rigidity of the sidewall 133 can be improved.

[0091] In the clutch device 10 of this embodiment, the length K1 of the first groove 136 in the circumferential direction S is longer than the length K2 of the second groove 137 in the circumferential direction S, and the length M of the cut portion 145 in the circumferential direction S is longer than the length K1 of the first groove 136 in the circumferential direction S. According to the above method, the clutch housing 130 can be made lighter.

[0092] In the clutch device 10 of this embodiment, the length H1 of the portion of the annular wall 140 in the direction D where the slit 145 is formed is less than half the length H2 of the annular wall 140 in the direction D. According to this method, the clutch housing 130 can be made lighter while ensuring the rigidity of the sidewall 133.

[0093] The preferred embodiments of the present invention have been described above. However, the above embodiments are merely illustrative, and the present invention can be implemented in various other ways.

[0094] In the embodiments described above, the clutch central portion 40 and the pressure plate 70 are configured to hold the output-side rotating plate 22, but this is not a limitation. For example, it may be configured such that only the clutch central portion 40 holds the output-side rotating plate 22, or it may be configured such that only the pressure plate 70 holds the output-side rotating plate 22.

[0095] In the above embodiments, the central side cam portion 60 has a central side auxiliary cam surface 60A and a central side sliding cam surface 60S, but it may have only one of them or neither of them.

[0096] In the above embodiments, the pressure-side cam portion 90 has a pressure-side auxiliary cam surface 90A and a pressure-side sliding cam surface 90S, but it may have only one of them or neither.

[0097] In the above embodiments, the second groove 37 and the second groove 137 are configured to hold only the outermost input-side rotating plate 20X among the plurality of input-side rotating plates 20, but are not limited thereto. The second groove 37 and the second groove 137 may also be configured to hold at least one input-side rotating plate 20 in addition to the outermost input-side rotating plate 20X. In this case, the step portion 34 and the step portion 134 are configured to be able to contact a portion of the input-side rotating plate 20.

[0098] In the second embodiment described above, the cutout 145 is located between adjacent first grooves 136 in the circumferential direction S and is located radially outside the second groove 137, but is not limited to this. The cutout 145 may also be located between adjacent second grooves 137 in the circumferential direction S and is located radially outside the first groove 136. The cutout 145 may also overlap with a portion of the first groove 136 when viewed radially. The cutout 145 may also communicate with the first groove 136. In this case, the length M of the cutout 145 in the circumferential direction S is longer than the length K1 of the first groove 136 in the circumferential direction. Furthermore, the second groove 137 may not penetrate the sidewall 133 radially. Additionally, the cutout 145 may be located radially inside either the first groove 136 or the second groove 137.

[0099] In the second embodiment described above, the annular wall 140 is configured to extend from a portion of the second groove 137 to a portion of the third groove 138, overlapping with a portion of both the second groove 137 and the third groove 138 when viewed radially, but is not limited thereto. The annular wall 140 may be configured to overlap only a portion of the second groove 137 when viewed radially, or it may be configured to overlap only a portion of the third groove 138 when viewed radially.

[0100] The technology disclosed herein can be applied to various types of clutch devices. In the above embodiment, an example of a so-called externally tangential clutch device has been described, in which the pressure plate 70 is located axially between the clutch center portion 40 and the clutch housing 30 on the output shaft 15, but this is not a limitation. For example, it can also be applied to a so-called internally tangential clutch device in which the pressure plate 70 is located on the opposite side of the clutch housing 30, across the clutch center portion 40, axially on the output shaft 15.

Claims

1. A clutch device for transmitting or discontinuing the rotational driving force of an input shaft to an output shaft, wherein, The clutch device includes: The clutch housing rotates integrally with the gear that is driven to rotate by the rotation of the input shaft, and maintains multiple input-side rotating plates; The central portion of the clutch is housed in the clutch housing and rotates together with the output shaft. as well as The pressure plate is configured to be able to approach or separate from the central portion of the clutch and to rotate relative to it, and is capable of pressing against the input-side rotating plate and a plurality of output-side rotating plates alternately arranged with the input-side rotating plate. The clutch housing includes: The gear is mounted on the annular bottom wall; The sidewall extends from the outer periphery of the bottom wall in the first direction when the direction from one side to the other is defined as the first direction and the direction from the other side to one side is defined as the second direction in the axial direction of the output shaft. A first groove is provided on the side wall and recessed from the end of the side wall in the first direction toward the second direction, and at least a portion of it extends radially through, and holds a plurality of the input-side rotating plates; The second groove is disposed on the side wall and is adjacent to the first groove in the circumferential direction. It is recessed from the end of the side wall in the first direction toward the second direction and at least retains the outermost input side rotating plate among the plurality of input side rotating plates located on the side closest to the first direction. as well as The third groove is disposed on the side wall and recessed from the end of the second groove in the second direction toward the second direction, and at least a portion of it extends through the radial direction, and does not hold the input side rotating plate and the outermost input side rotating plate.

2. The clutch device according to claim 1, wherein, The clutch housing has a fourth groove provided on the side wall, and at least a portion of the fourth groove is radially recessed from the end of the third groove in the second direction toward the second direction.

3. The clutch device according to claim 2, wherein, The circumferential length of the third groove is shorter than the circumferential length of the second groove.

4. The clutch device according to claim 3, wherein, The circumferential length of the third groove is shorter than the circumferential length of the fourth groove.

5. The clutch device according to claim 2, wherein, The circumferential length of the second groove, the circumferential length of the third groove, and the circumferential length of the fourth groove are shorter than the circumferential length of the first groove.

6. The clutch device according to claim 2, wherein, The fourth groove is recessed from the inner side of the radial direction toward the outer side of the radial direction.

7. The clutch device according to claim 2, wherein, When the length from the end of the sidewall in the first direction to the end of the first groove in the second direction is set as L1, the length from the end of the sidewall in the first direction to the end of the second groove in the second direction is set as L2, the length from the end of the sidewall in the first direction to the end of the third groove in the second direction is set as L3, and the length from the end of the sidewall in the first direction to the end of the fourth groove in the second direction is set as L4, the relationship L1 > L4 > L3 > L2 is satisfied.

8. The clutch device according to claim 3, wherein, The clutch housing has a stepped portion disposed between the second groove and the third groove, and is capable of contacting a portion of the outermost input-side rotating plate.

9. The clutch device according to claim 1, wherein, The clutch housing has an annular wall that is disposed on the outer side of the sidewall in the radial direction and is continuous throughout the entire circumference.

10. The clutch device according to claim 9, wherein, The annular wall extends from a portion of the second groove to a portion of the third groove.

11. The clutch device according to claim 10, wherein, The circumferential length of the third groove is shorter than the circumferential length of the second groove.

12. The clutch device according to claim 1, wherein, At least a portion of the second groove extends through the radial direction.

13. The clutch device according to claim 1, wherein, The clutch housing includes: An annular wall, disposed radially on the outside of the sidewall, and continuous throughout the entire circumference; and The cut portion is provided in the annular wall and is recessed from the end of the annular wall in the first direction toward the second direction, and at least a portion of it extends through the radial direction.

14. The clutch device according to claim 13, wherein, The circumferential length of the cut portion is longer than the circumferential length of the second groove portion.

15. The clutch device according to claim 13, wherein, At least a portion of the annular wall is located radially outside the end of the sidewall in the first direction.

16. The clutch device according to claim 13, wherein, A portion of the second groove extends radially through the groove. When viewed from the radial direction, the cut portion overlaps with a portion of the second groove portion.

17. The clutch device according to claim 13, wherein, The annular wall extends from a portion of the second groove to a portion of the third groove.

18. The clutch device according to claim 13, wherein, The circumferential length of the first groove is longer than the circumferential length of the second groove. The circumferential length of the cut portion is longer than the circumferential length of the first groove portion.

19. The clutch device according to claim 13, wherein, The axial length of the portion of the annular wall in which the cut is formed is less than half the axial length of the annular wall.

20. The clutch device according to claim 13, wherein, When viewed from the radial direction, the cut portion overlaps with a portion of the second groove portion.

21. The clutch device according to claim 20, wherein, At least a portion of the annular wall is located radially outside the end of the sidewall in the first direction.

Images