Clutch device

Abstract

To provide a clutch device capable of suppressing vibration.SOLUTION: A clutch device 100 comprises a clutch center 3, a pressure plate 4, and a lifter plate 6. The clutch center 3 has a boss portion 31 extending in the axial direction. The pressure plate 4 is disposed to be movable axially relative to the clutch center 3. The lifter plate 6 is fixed to the pressure plate 4. The lifter plate 6 has a first contact surface 61. The first contact surface 61 contacts the clutch center 3 in the radial direction. The pressure plate 4 is disposed at a space from the boss portion 31 in the radial direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a clutch device. [Background technology]

[0002] Generally, a clutch device is used in motorcycles such as motorcycles and buggies to transmit power from an engine to a transmission in an interruptable manner. The clutch device includes a clutch center, a pressure plate, and a lifter plate (for example, see Patent Document 1). The lifter plate is fixed to the pressure plate. The pressure plate is positioned in the radial direction by contacting with the clutch center. In detail, the pressure plate is positioned in the radial direction by contacting with the inner peripheral surface of the pressure plate with the outer peripheral surface of the boss portion of the clutch center. The pressure plate and the lifter plate are movable in the axial direction relative to the clutch center. When the pressure plate moves in the axial direction, the inner peripheral surface of the pressure plate slides on the outer peripheral surface of the boss portion of the clutch center. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-080021 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the clutch device configured as described above, vibrations may occur when the clutch is in a half-clutch state. Therefore, an object of the present invention is to provide a clutch device that can suppress vibrations. [Means for solving the problem]

[0005] As a result of extensive research, the inventors have found that vibration occurs due to the following reasons: When some clutch parts are thick in the circumferential direction, the pressure plate and lifter plate tilt with respect to the rotation axis around the contact part between the boss part of the clutch center and the pressure plate. As a result, the deviation of the rotation center of the lifter plate away from the contact part becomes relatively large, causing vibration.

[0006] Therefore, a clutch device according to a first aspect includes a clutch center, a pressure plate, and a lifter plate. The clutch center has a boss portion extending in the axial direction. The pressure plate is arranged to be movable relative to the clutch center in the axial direction. The lifter plate is fixed to the pressure plate. The lifter plate has a first abutment surface. The first abutment surface abuts against the clutch center in the radial direction. The pressure plate is arranged at a distance from the boss portion in the radial direction.

[0007] According to this configuration, the lifter plate abuts against the clutch center in the radial direction. Therefore, even if some clutch parts are thick in the circumferential direction, it is possible to suppress the deviation of the rotation center of the lifter plate, and as a result, it is possible to suppress the occurrence of vibration. In addition, since the pressure plate does not abut against the boss part, the pressure plate and the lifter plate can move smoothly in the axial direction.

[0008] The clutch device according to the second aspect is the clutch device according to the first aspect, and is configured as follows: The clutch center is made of aluminum or an aluminum alloy. The lifter plate is made of aluminum or an aluminum alloy. With this configuration, the lifter plate can slide smoothly against the clutch center.

[0009] A clutch device according to a third aspect is the clutch device according to the first or second aspect, and is configured as follows: The lifter plate has a second contact surface that contacts the pressure plate in the radial direction.

[0010] A clutch device according to a fourth aspect is the clutch device according to the third aspect, and is configured as follows: The first contact surface overlaps with the second contact surface when viewed in the radial direction.

[0011] A clutch device according to a fifth aspect is the clutch device according to any one of the first to fourth aspects, and is configured as follows: The pressure plate has an opposing surface that faces the boss portion in the radial direction. The opposing surface is not subjected to cutting.

[0012] A clutch device according to a sixth aspect is the clutch device according to any one of the first to fifth aspects, and is configured as follows: The lifter plate has a bent portion. The bent portion is a portion where an outer peripheral end portion of the lifter plate is bent in the axial direction. The pair abutment surface is formed on this bent portion.

[0013] A clutch device according to a seventh aspect is the clutch device according to any one of the first to sixth aspects, and is configured as follows: the pressure plate has a pressure surface facing a first axial side; the clutch center has a pressure-receiving surface facing a second axial side; and the lifter plate is disposed on the first axial side with respect to the pressure-receiving surface.

[0014] A clutch device according to an eighth aspect is the clutch device according to any one of the first to seventh aspects, further comprising a clutch portion. The clutch portion is disposed between the clutch center and the pressure plate. The clutch center has a pressure receiving surface. The pressure plate has a pressing surface. The clutch portion is disposed between the pressure receiving surface and the pressing surface. Effect of the Invention

[0015] According to the present invention, the occurrence of vibrations can be suppressed. [Brief description of the drawings]

[0016] [Figure 1] FIG. [Diagram 2]Cross-sectional view of line II-II in Figure 1. [Diagram 3] FIG. [Figure 4] Cross-sectional view taken along line IV-IV in Figure 1. [Diagram 5] FIG. [Figure 6] FIG. [Figure 7] FIG. 11 is a cross-sectional view of a clutch device according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] The clutch device according to this embodiment will be described below with reference to the drawings. In the following description, the axial direction is the direction in which the rotation axis O of the clutch device 100 extends. The circumferential direction is the circumferential direction of a circle centered on the rotation axis O, and the radial direction is the radial direction of a circle centered on the rotation axis O. The first rotation direction is the direction in which the clutch device rotates, and the second rotation direction is the rotation direction opposite to the first rotation direction.

[0018] [Clutch device] Fig. 1 is a plan view of the clutch device 100, and Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1. As shown in Figs. 1 and 2, the clutch device 100 is configured to transmit power from a drive source (e.g., an engine) to a drive wheel in an interruptible manner. The clutch device 100 is configured to rotate in a first rotational direction R1 (counterclockwise in Fig. 1) when transmitting power from the drive source to the drive wheel. The clutch device 100 rotates in the first rotational direction R1 around a rotation axis O.

[0019] The clutch device 100 has a clutch housing 2, a clutch center 3, a pressure plate 4, a clutch portion 5, and a lifter plate 6. The clutch device 100 also has a plurality of bolts 8 and a plurality of coil springs 9.

[0020] [Clutch housing] As shown in Fig. 2, the clutch housing 2 has a disk portion 21 and a cylindrical portion 22. The clutch housing 2 is connected to an input gear 10. The input gear 10 is an annular member to which power generated by a drive source (not shown) is input. The input gear 10 meshes with a drive gear (not shown) fixed to a crankshaft on the drive source side.

[0021] The disk portion 21 is connected to the input gear 10 via a plurality of coil springs 11. The cylindrical portion 22 extends from the outer circumferential edge portion of the disk portion 21 to a first side in the axial direction. The cylindrical portion 22 has a plurality of notches 221 extending in the axial direction. The multiple notches 221 are arranged at intervals from one another in the circumferential direction.

[0022] [Clutch center] The clutch center 3 is disposed on a first axial side with respect to the clutch housing 2. The clutch center 3 is also disposed radially inward with respect to the cylindrical portion 22 of the clutch housing 2. The clutch center 3 is disposed rotatably about a rotation axis O. The clutch center 3 is configured to rotate relative to the clutch housing 2. The clutch center 3 is immovable in the axial direction. However, the pressure plate 4 is movable in the axial direction. Therefore, the clutch center 3 is movable relative to the pressure plate 4 in the axial direction.

[0023] Fig. 3 is a plan view of the clutch center 3 as viewed from a first side in the axial direction, and Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 1. As shown in Figs. 2 to 4, the clutch center 3 has a boss portion 31, a first cylindrical portion 32, a plurality of holding portions 33, a first flange portion 34, a pressure-receiving surface 35, a plurality of first cam surfaces 36, and a plurality of second cam surfaces 37. The clutch center 3 is made of aluminum or an aluminum alloy.

[0024] The boss portion 31 is cylindrical and extends in the axial direction. The boss portion 31 has, in its center, a splined hole 311 extending in the axial direction. An input shaft (not shown) of the transmission is spline-engaged with the splined hole 311. A thrust plate 14 is provided between the boss portion 31 and the input gear 10 in the axial direction.

[0025] The first cylindrical portion 32 extends in the axial direction. The first cylindrical portion 32 is disposed radially outward of the boss portion 31 so as to surround the boss portion 31. A plurality of grooves 321 extending in the axial direction are formed on the outer circumferential surface of the first cylindrical portion 32. The plurality of grooves 321 are disposed at intervals from one another in the circumferential direction.

[0026] The retaining portion 33 is disposed between the boss portion 31 and the first cylindrical portion 32 in the radial direction. The retaining portion 33 connects the boss portion 31 and the first cylindrical portion 32. The retaining portions 33 are disposed at intervals from one another in the circumferential direction. A space is formed between the retaining portions 33 adjacent to one another in the circumferential direction. Each retaining portion 33 has a retaining recess 331 configured to retain the coil spring 9. The retaining recess 331 extends in the axial direction. The retaining recess 331 opens to a first axial side.

[0027] 4, the first cam surface 36 is formed on a surface of the holding portion 33 facing the first rotation direction R1. The first cam surface 36 faces the first rotation direction R1 and also faces the second axial side. That is, the first cam surface 36 extends at an angle with respect to the axial direction and the first rotation direction.

[0028] The second cam surface 37 is formed on a surface of the holding portion 33 facing the second rotation direction R2. The second cam surface 37 faces the second rotation direction R2 and also faces the first axial side. That is, the second cam surface 37 extends at an incline with respect to the axial direction and the second rotation direction. The second cam surface 37 faces away from the first cam surface 36.

[0029] As shown in FIG. 2, the first flange portion 34 extends radially outward from the first cylindrical portion 32. In detail, the first flange portion 34 extends radially outward from the end portion of the first cylindrical portion 32 on the first axial side. The first flange portion 34 is annular and extends circumferentially. The surface of the first flange portion 34 facing the second axial side becomes the pressure-receiving surface 35. That is, the pressure-receiving surface 35 faces the second axial side. The pressure-receiving surface 35 is annular and extends circumferentially. The pressure-receiving surface 35 is disposed on the outer periphery of the clutch center 3. The pressure-receiving surface 35 is disposed on the first axial side with respect to a pressing surface 49 described later.

[0030] The clutch center 3 has a plurality of first guide surfaces 38. The first guide surfaces 38 face radially inward. The plurality of first guide surfaces 38 are arranged at intervals from one another in the circumferential direction. The first guide surfaces 38 are arranged at an end portion of the clutch center 3 on a first axial side. Specifically, the first guide surfaces 38 overlap with the first flange portion 34 when viewed in the radial direction.

[0031] 2 and 3, the clutch center 3 has a plurality of first protruding portions 39 that protrude radially inward from the inner circumferential surface of the first cylindrical portion 32. Each of the first protruding portions 39 extends in the circumferential direction. The first protruding portions 39 are disposed at intervals from one another in the circumferential direction. The surface of each of the first protruding portions 39 that faces radially inward is a first guide surface 38.

[0032] [Pressure plate] Fig. 5 is a plan view of the pressure plate 4 as viewed from the first axial side. As shown in Figs. 2, 4, and 5, the pressure plate 4 is arranged to be movable in the axial direction. That is, the pressure plate 4 is movable in the axial direction relative to the clutch center 3. The pressure plate 4 is arranged to be rotatable about the rotation axis O.

[0033] The pressure plate 4 has a second cylindrical portion 41, a base portion 42, a plurality of pillar portions 43, a plurality of space portions 44, a plurality of second guide surfaces 45, a plurality of third cam surfaces 46, a plurality of fourth cam surfaces 47, a second flange portion 48, and a pressing surface 49. The pressure plate 4 is made of aluminum or an aluminum alloy.

[0034] As shown in Fig. 5, the second cylindrical portion 41 extends in the axial direction. The second cylindrical portion 41 has a plurality of grooves 411. The grooves 411 are formed on the outer circumferential surface of the second cylindrical portion 41. The grooves 411 extend in the axial direction. The plurality of grooves 411 are disposed at intervals from one another in the circumferential direction.

[0035] Each base portion 42 extends radially inward from the inner circumferential surface of the second cylindrical portion 41. The multiple base portions 42 are arranged at intervals from one another in the circumferential direction. The pressure plate 4 has multiple opposing surfaces 421. Each opposing surface 421 faces radially inward. In detail, each opposing surface 421 is a surface of each base portion 42 facing radially inward.

[0036] The opposing surface 421 faces the boss portion 31 in the radial direction. That is, the opposing surface 421 faces the outer circumferential surface of the boss portion 31. The opposing surface 421 is disposed at a distance from the boss portion 31 of the clutch center 3 in the radial direction. That is, the pressure plate 4 is disposed at a distance from the boss portion 31 in the radial direction. Note that each opposing surface 421 is not subjected to cutting processing.

[0037] As shown in Fig. 4, the third cam surface 46 is formed on a surface of the base portion 42 facing the second rotation direction R2. The third cam surface 46 faces the first axial side and also faces the second rotation direction R2. That is, the third cam surface 46 is inclined with respect to the axial direction and the second rotation direction. The third cam surface 46 faces the first cam surface 36. The third cam surface 46 extends approximately parallel to the first cam surface 36.

[0038] The fourth cam surface 47 is formed on a surface of the base portion 42 facing the first rotation direction R1. The fourth cam surface 47 faces the second axial side and faces the first rotation direction R1. That is, the fourth cam surface 47 is inclined with respect to the axial direction and the first rotation direction. The fourth cam surface 47 faces away from the third cam surface 46. The fourth cam surface 47 faces the second cam surface 37. The fourth cam surface 47 extends approximately parallel to the second cam surface 37.

[0039] As shown in Fig. 2 and Fig. 5, the pillar portion 43 extends from the base portion 42 to the first side in the axial direction. The pillar portion 43 extends to the first side in the axial direction, penetrating the clutch center 3. In detail, the pillar portion 43 extends to the first side in the axial direction through a space between a pair of adjacent holding portions 33. The pillar portion 43 has a screw hole 431 penetrating in the axial direction (see Fig. 2). The multiple pillar portions 43 are arranged at intervals from one another in the circumferential direction. The pillar portion 43 is cylindrical.

[0040] The space 44 is disposed between the pillar portions 43 in the circumferential direction. The space 44 is also disposed between the base portions 42 in the circumferential direction. The space 44 penetrates the pressure plate 4 in the axial direction. The retaining portion 33 of the clutch center 3 is disposed in this space 44. By disposing the retaining portion 33 in the space 44 in this manner, the retaining portion 33 can be disposed as close to the second axial side as possible. For example, the surface of the retaining portion 33 facing the second axial side is located on the second axial side of the pressure plate 4. Also, the end face of the coil spring 9 on the second axial side is located on the second axial side of the pressing surface 49. As a result, the axial dimension of the coil spring 9 can be increased.

[0041] The opening 40 is disposed in the center of the pressure plate 4. The opening 40 penetrates the pressure plate 4 in the axial direction. The multiple spaces 44 are connected to the opening 40. That is, the multiple spaces 44 communicate with each other via the opening 40. The boss portion 31 of the clutch center 3 is disposed within this opening 40. The pressure plate 4 is disposed with a gap between it and the boss portion 31 in the radial direction. That is, the boss portion 31 of the clutch center 3 is not in contact with the pressure plate 4.

[0042] The second guide surface 45 faces radially outward. The second guide surfaces 45 are arranged at intervals from one another in the circumferential direction. The second guide surface 45 is arranged at an end portion of the pressure plate 4 on the first axial side. Specifically, the second guide surface 45 overlaps with the first guide surface 38 when viewed in the radial direction.

[0043] The pressure plate 4 has a plurality of second protrusions 451. The second protrusions 451 protrude radially outward from the pillar portions 43. The second protrusions 451 extend from the base portion 42 along the pillar portions 43 toward the first axial side. A surface of the second protrusions 451 facing radially outward is the second guide surface 45. Since the second protrusions 451 are connected to the pillar portions 43, it is possible to prevent the coil spring 9 from being erroneously attached to the pillar portions 43.

[0044] The second flange portion 48 extends radially outward from the second cylindrical portion 41. The second flange portion 48 is annular and extends in the circumferential direction. The surface of the second flange portion 48 facing the first axial side becomes the pressing surface 49. In other words, the pressing surface 49 faces the first axial side. The pressing surface 49 is annular and extends in the circumferential direction. The pressing surface 49 is disposed on the outer periphery of the pressure plate 4.

[0045] 2, the pressing surface 49 is disposed on the second axial side with respect to the pressure-receiving surface 35. When viewed in the axial direction, the pressing surface 49 overlaps with the pressure-receiving surface 35.

[0046] [Clutch section] The clutch portion 5 is configured to transmit power between the clutch housing 2 and the clutch center 3 in an interruptable manner. The clutch portion 5 is disposed between the clutch center 3 and the pressure plate 4. In detail, the clutch portion 5 is disposed between the pressure receiving surface 35 and the pressing surface 49.

[0047] The clutch portion 5 has a plurality of first clutch plates 51 and a plurality of second clutch plates 52. The first clutch plates 51 and the second clutch plates 52 are annular and extend in the circumferential direction. The first clutch plates 51 and the second clutch plates 52 are disposed between the pressure receiving surface 35 and the pressing surface 49. The first clutch plates 51 and the second clutch plates 52 are disposed alternately in the axial direction.

[0048] The first clutch plate 51 is movable in the axial direction but is unable to rotate relative to the clutch housing 2. In other words, the first clutch plate 51 rotates integrally with the clutch housing 2. In detail, a plurality of engagement protrusions that protrude radially outward are formed on the outer periphery of the first clutch plate 51. The engagement protrusions mesh with notches 221 formed in the cylindrical portion 22 of the clutch housing 2. Friction material is affixed to both sides of the first clutch plate 51.

[0049] The second clutch plate 52 has a plurality of engagement protrusions formed at its inner circumferential end portion, which protrude radially inward. The engagement protrusions mesh with grooves 321 formed in the first cylindrical portion 32 of the clutch center 3. Therefore, the second clutch plate 52 is movable in the axial direction with respect to the clutch center 3 but is unable to rotate relative to the clutch center 3. In other words, the second clutch plate 52 rotates integrally with the clutch center 3. Note that a portion of the second clutch plate 52 rotates integrally with the pressure plate 4.

[0050] [Lifter plate] The lifter plate 6 is disposed on a first axial side with respect to the pressure plate 4. More specifically, the lifter plate 6 is disposed on a first axial side with respect to the pressure-receiving surface 35. The lifter plate 6 is attached to the tip portion (the upper end portion in FIG. 2) of each column portion 43. More specifically, bolts 8 fasten the pressure plate 4 and the lifter plate 6. The bolts 8 are threadedly engaged with the screw holes 431 of the column portions 43 through the through holes of the lifter plate 6. Therefore, the lifter plate 6 is fixed to the pressure plate 4 and rotates integrally with the pressure plate 4. Also, the lifter plate 6 moves axially integrally with the pressure plate 4.

[0051] 1, 2, and 6, the lifter plate 6 is disk-shaped with an opening 60 in the center. A bearing (not shown) is fitted in the opening 60. A release member (not shown) presses the lifter plate 6 toward the second axial direction via the bearing, so that the lifter plate 6 moves toward the second axial direction together with the pressure plate 4. As a result, power transmission in the clutch portion 5 is interrupted.

[0052] The lifter plate 6 has a plurality of first abutment surfaces 61 and a plurality of second abutment surfaces 62. The first abutment surfaces 61 abut against the clutch center 3 in the radial direction. More specifically, the first abutment surfaces 61 face radially outward. The first abutment surfaces 61 abut against the first guide surfaces 38 of the clutch center 3. The first abutment surfaces 61 also slide on the first guide surfaces 38 in the axial direction. The first abutment surfaces 61 protrude radially outward beyond the other outer peripheral surfaces of the lifter plate 6. In this manner, the first abutment surfaces 61 abut against the first guide surfaces 38, thereby positioning the lifter plate 6 in the radial direction.

[0053] The first contact surface 61 overlaps with the column portion 43 when viewed in the radial direction. The first contact surface 61 does not overlap with the coil spring 9 when viewed in the radial direction. The first contact surface 61 is disposed radially outward of a through hole 65 for passing the bolt 8 through. The first contact surface 61 overlaps with the through hole 65 when viewed in the radial direction.

[0054] The second abutment surface 62 abuts against the pressure plate 4 in the radial direction. More specifically, the second abutment surface 62 faces radially inward. The second abutment surface 62 abuts against the second guide surface 45 of the pressure plate 4. The second abutment surface 62 overlaps with the first abutment surface 61 when viewed in the radial direction.

[0055] The lifter plate 6 has a plurality of bent portions 63. The plurality of bent portions 63 are arranged at intervals from one another in the circumferential direction. Each bent portion 63 is formed by bending an outer peripheral end portion of the lifter plate 6 toward a second axial side. The first abutment surface 61 is formed on the bent portion 63. More specifically, a surface of the bent portion 63 facing radially outward is the first abutment surface 61. The second abutment surface 62 is formed on the bent portion 63. More specifically, a surface of the bent portion 63 facing radially inward is the second abutment surface 62.

[0056] The lifter plate 6 is made of aluminum or an aluminum alloy. Specifically, it is made of the same material as the clutch center 3.

[0057] [Coil spring] 1 and 2, the coil springs 9 are arranged at intervals from the pillar portions 43 in the circumferential direction. In detail, a plurality of coil springs 9 and a plurality of pillar portions 43 are arranged alternately in the circumferential direction. The coil springs 9 are arranged in a compressed state between the clutch center 3 and the lifter plate 6 in the axial direction.

[0058] The coil spring 9 has a first end 91 and a second end 92 in the axial direction. The first end 91 is an end on a first axial side, and the second end 92 is an end on a second axial side. The first end 91 of the coil spring 9 abuts against the lifter plate 6. The second end 92 of the coil spring 9 is held by the holding portion 33 of the clutch center 3. More specifically, the second end 92 is disposed within a holding recess 331 of the holding portion 33. With the second end 92 held by the holding portion 33, the coil spring 9 is restricted from moving in the radial and circumferential directions.

[0059] The coil spring 9 biases the pressure plate 4 toward the first axial side via the lifter plate 6. As a result, the pressing surface 49 is biased to approach the pressure receiving surface 35, the clutch unit 5 is in a clutch-on state, and power is transmitted. Note that, by using the release member to move the pressure plate 4 toward the second axial side against the biasing force of the coil spring 9, the pressing surface 49 moves away from the pressure receiving surface 35. As a result, the clutch unit 5 is in a clutch-off state, and the transmission of power between the clutch housing 2 and the clutch center 3 is interrupted.

[0060] [Cam mechanism operation] When the pressure plate 4 rotates relative to the clutch center 3 in the first rotation direction R1 during acceleration, the second cam surface 37 and the fourth cam surface 47 press against each other, and the pressure plate 4 moves toward the first axial side. As a result, the pressing surface 49 moves closer to the pressure receiving surface 35, and the coupling force of the clutch portion 5 increases.

[0061] On the other hand, when the clutch center 3 rotates relative to the pressure plate 4 in the first rotation direction R1 during deceleration, the first cam surface 36 and the third cam surface 46 press against each other, and the pressure plate 4 moves to the second axial side. As a result, the pressing surface 49 moves away from the pressure receiving surface 35, and the coupling force of the clutch portion 5 is reduced.

[0062] [Variations] Although the embodiment of the present invention has been described above, the present invention is not limited to these, and various modifications are possible without departing from the spirit of the present invention. Note that the following modifications can basically be applied simultaneously.

[0063] (a) In the above embodiment, the first contact surface 61 faces radially outward, but may face radially inward. In this case, the first guide surface 38 faces radially outward.

[0064] (b) The second abutment surface 62 does not have to be formed on the bent portion 63. For example, as shown in FIG. 7, the pressure plate 4 has a protruding portion 401 that protrudes toward the second axial side. The protruding portion 401 is disposed radially inward relative to the column portion 43. The second abutment surface 62 is formed on this protruding portion 401. In detail, the surface of the protruding portion 401 that faces radially outward is the second abutment surface 62. In this manner, the second abutment surface 62 may face radially outward. In this case, the second guide surface 45 faces radially inward.

[0065] (c) The lifter plate 6 has a plurality of first abutment surfaces 61 spaced apart in the circumferential direction, but may have only one first abutment surface 61. That is, the first abutment surface 61 may be an annular surface extending in the circumferential direction. Similarly, the second abutment surface 62 may also be an annular surface extending in the circumferential direction. [Explanation of symbols]

[0066] 3: Clutch center 31: Boss Department 35: Pressure receiving surface 4: Pressure plate 49: Pressing surface 421: Opposite surface 6: Lifter plate 61: 1st contact surface 62:Second contact surface 63: Bending part 100: Clutch device

Claims

1. a clutch center having a boss portion extending in an axial direction; a pressure plate disposed so as to be movable relative to the clutch center in the axial direction; a lifter plate fixed to the pressure plate; Equipped with The lifter plate has a first contact surface that contacts the clutch center in a radial direction, The pressure plate is disposed at a distance from the boss portion in the radial direction. Clutch device.

2. The clutch center is made of aluminum or an aluminum alloy. The lifter plate is made of aluminum or an aluminum alloy.

2. The clutch device according to claim 1.

3. The lifter plate has a second abutment surface that abuts against the pressure plate in a radial direction.

2. The clutch device according to claim 1.

4. The first abutment surface overlaps with the second abutment surface when viewed in the radial direction.

4. The clutch device according to claim 3.

5. the pressure plate has an opposing surface that faces the boss portion in a radial direction, The opposing surface is not subjected to cutting processing.

2. The clutch device according to claim 1.

6. The lifter plate has a bent portion bent in an axial direction, The first contact surface is formed on the bent portion.

2. The clutch device according to claim 1.

7. The pressure plate has a pressing surface facing a first axial direction side, The clutch center has a pressure receiving surface facing a second axial direction side, The lifter plate is disposed on a first axial side with respect to the pressure-receiving surface.

2. The clutch device according to claim 1.

8. The clutch portion is disposed between the clutch center and the pressure plate. The clutch center has a pressure receiving surface, The pressure plate has a pressing surface, The clutch portion is disposed between the pressure receiving surface and the pressing surface.

2. The clutch device according to claim 1.

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