Clutch device

Abstract

To increase the axial size of an energizing member.SOLUTION: A clutch device 100 includes a first rotary body 4, a support plate 6, a second rotary body 3, a clutch part 5, and an energizing member 9, The first rotary body 4 has a plurality of pillar parts 42, and a plurality of space parts. The space parts are arranged between the pillar parts 42 in the peripheral direction, and penetrate in the axial direction. The support plate 6 is mounted at the front ends of the pillar parts 42. The second rotary body 3 has a hold part 33 arranged in the space parts. The clutch part 5 is arranged between the first rotary body 4 and the second rotary body 3. The energizing member 9 has a first end 91 and a second end 92. The first end 91 abuts on the support plate 6. The second end 92 is held by the hold part 33.SELECTED DRAWING: Figure 2

Description

Technical Field

[0006] ,

[0007] , ,

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

Background Art

[0002] Generally, a clutch device is used in motorcycles such as motorcycles and buggies to transmit or cut off the power from the engine to the transmission. The clutch device has a clutch center, a pressure plate, a support plate, and a clutch portion (see Patent Document 1). The support plate is attached to the pressure plate.

[0003] Further, the clutch device has a plurality of coil springs disposed between the clutch center and the support plate. The coil springs bias the pressure plate in the axial direction via the support plate.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the clutch device as described above, it is desired to increase the axial dimension of the biasing member (coil spring).

[0006] An object of the present invention is to provide a clutch device capable of increasing the axial dimension of the biasing member.

Means for Solving the Problems

[0007] The clutch device according to the first embodiment is configured to be rotatable. This clutch device comprises a first rotating body, a support plate, a second rotating body, a clutch section, and a biasing member. The first rotating body is rotatably positioned. The first rotating body has a plurality of columnar sections and a plurality of space sections. The columnar sections extend to a first side in the axial direction. The space sections are positioned between the columnar sections in the circumferential direction and penetrate in the axial direction. The support plate is attached to the ends of the columnar sections. The second rotating body has a retaining section positioned within the space sections. The second rotating body is rotatably positioned. The clutch section is positioned between the first rotating body and the second rotating body. The biasing member has a first end and a second end. The first end abuts against the support plate. The second end is held by the retaining section.

[0008] In this configuration, the space within the first rotating body penetrates the first rotating body axially, and the holding portion is positioned within this space. Therefore, the position of the second end of the biasing member can be moved further away from the first end than in conventional designs. As a result, the axial dimension of the biasing member can be increased.

[0009] The clutch device according to the second embodiment is configured as follows in the clutch device according to the first embodiment: The second rotating body has a boss portion extending in the axial direction. The first rotating body is arranged radially at a distance from the boss portion.

[0010] The clutch device according to the third embodiment is configured as follows in the clutch device according to the first or second embodiment: The first rotating body has a pressing surface facing the first side in the axial direction. The second rotating body has a pressure-receiving surface facing the second side in the axial direction. The clutch portion is arranged between the pressing surface and the pressure-receiving surface. The first rotating body is arranged to be movable in the axial direction.

[0011] The clutch device according to the fourth embodiment is configured as follows in the clutch device according to any of the first to third embodiments: The first rotating body has an opening that penetrates axially in its central part. Multiple spaces are connected to the opening.

[0012] The clutch device according to the fifth embodiment is configured as follows in the clutch device according to any of the first to fourth embodiments: The first rotating body has a pair of cam portions on both sides in the circumferential direction relative to the column portion.

[0013] The clutch device according to the sixth embodiment is configured as follows in the clutch device according to any of the first to fifth embodiments: The holding portion has a surface facing the second axial side that is located on the second axial side relative to the first rotating body.

[0014] The clutch device according to the seventh embodiment is configured as follows in the clutch device according to the third embodiment: The biasing member has an end face on the second axial side that is located on the second axial side relative to the pressing surface.

[0015] The clutch device according to the eighth embodiment is configured as follows in the clutch device according to any of the first to seventh embodiments: The first rotating body has a plurality of guide walls. The guide walls are arranged radially outward with respect to the column portion. The guide walls have outer guide surfaces facing radially outward. The second rotating body has an inner contact surface. The inner contact surface faces radially inward. The inner contact surface contacts the outer guide surface.

[0016] The clutch device according to the ninth embodiment is configured as follows in the clutch device according to the eighth embodiment: The guide wall has an inner guide surface facing radially inward. The support plate has an outer circumferential surface that abuts against the inner guide surface.

[0017] The clutch device according to the tenth embodiment is configured as follows in the clutch device according to the ninth embodiment: The inner guide surface is positioned to overlap with the outer guide surface in a radial view.

[0018] The clutch device according to the 11th aspect is configured as follows in the clutch device according to the 9th or 10th aspect. The support plate is disc-shaped with an opening at the center. The outer peripheral surface of the support plate has a plurality of outer contact surfaces and a plurality of gripping surfaces. The outer contact surfaces contact the inner guide surfaces. The gripping surfaces are arranged radially inward with respect to the outer contact surfaces. According to this configuration, the gripping surfaces can be gripped by a chuck, and the outer contact surfaces and the inner wall surface of the opening can be machined simultaneously.

[0019] The clutch device according to the 12th aspect is configured as follows in the clutch device according to the 11th aspect. The support plate has a plurality of through holes arranged in the circumferential direction. The outer contact surfaces overlap the through holes in a radial view.

[0020] The clutch device according to the 13th aspect is configured as follows in the clutch device according to the 8th to 12th aspects. The first rotating body has a connecting and reinforcing portion. The connecting and reinforcing portion extends to the first side in the axial direction. The connecting and reinforcing portion connects the column portion and the guide wall.

Advantages of the Invention

[0021] According to the present invention, the axial dimension of the biasing member can be increased.

Brief Description of the Drawings

[0022] [Figure 1] Plan view of the clutch device. [Figure 2] Cross-sectional view taken along line II-II of FIG. 1. [Figure 3] Plan view of the clutch center. [Figure 4] Cross-sectional view taken along line IV-IV of FIG. 1. [Figure 5] Plan view of the pressure plate 4. <000095><000096>Perspective view of the pressure plate. [Figure 7] Plan view of the support plate. [Figure 8] Cross-sectional view of the clutch device according to the modification. [Modes for carrying out the invention]

[0023] The clutch device according to this embodiment will be described below with reference to the drawings. In the following description, the axial direction refers to the direction in which the rotation axis O of the clutch device 100 extends. The circumferential direction refers to the circumferential direction of a circle centered on the rotation axis O, and the radial direction refers to the radial direction of a circle centered on the rotation axis O. The first rotational direction is the direction in which the clutch device rotates, and the second rotational direction is the rotational direction opposite to the first rotational direction.

[0024] [Clutch device] Figure 1 is a plan view of the clutch device 100, and Figure 2 is a cross-sectional view taken along line II-II in Figure 1. As shown in Figures 1 and 2, the clutch device 100 is configured to transmit power from a drive source (e.g., an engine) to the drive wheels, and to interrupt that transmission. When transmitting power from the drive source to the drive wheels, the clutch device 100 is configured to rotate in a first rotational direction R1 (counterclockwise in Figure 1). The clutch device 100 rotates in the first rotational direction R1 around the rotation axis O.

[0025] The clutch device 100 includes a clutch housing 2, a clutch center 3 (an example of a second rotating body), a pressure plate 4 (an example of a first rotating body), a clutch section 5, and a support plate 6. The clutch device 100 also includes a plurality of bolts 8 and a plurality of coil springs 9 (an example of biasing members).

[0026] [Clutch Housing] As shown in Figure 2, the clutch housing 2 has a disc portion 21 and a cylindrical portion 22. The clutch housing 2 is connected to the input gear 10. This 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 the crankshaft on the drive source side.

[0027] The disc portion 21 is connected to the input gear 10 via a plurality of coil springs (not shown). The cylindrical portion 22 extends from the outer peripheral edge of the disc portion 21 toward the first axial direction. The cylindrical portion 22 has a plurality of notches 221 that extend in the axial direction. The plurality of notches 221 are spaced apart from each other in the circumferential direction.

[0028] [Clutch Center] Figure 3 is a plan view of the clutch center 3 as seen from the first side in the axial direction, and Figure 4 is a cross-sectional view taken along line IV-IV in Figure 1.

[0029] As shown in Figure 2, the clutch center 3 is positioned on the first axial side relative to the clutch housing 2. Furthermore, the clutch center 3 is positioned radially inward relative to the cylindrical portion 22 of the clutch housing 2. The clutch center 3 is rotatable about the 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 axially movable relative to the pressure plate 4.

[0030] As shown in Figures 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 portions 36, and a plurality of second cam portions 37.

[0031] The boss portion 31 is cylindrical and extends in the axial direction. The boss portion 31 has a spline hole 311 extending in the axial direction in its central part. The input shaft of the transmission (not shown) is spline-engaged in the spline hole 311. In the axial direction, a thrust plate 14 is provided between the boss portion 31 and the input gear 10.

[0032] The first cylindrical portion 32 extends in the axial direction. The first cylindrical portion 32 is positioned radially outward from the boss portion 31 so as to surround the boss portion 31. Multiple grooves (not shown) extending in the axial direction are formed on the outer circumferential surface of the first cylindrical portion 32. These multiple grooves are spaced apart from each other in the circumferential direction.

[0033] The retaining portion 33 is positioned radially between the boss portion 31 and the first cylindrical portion 32. The retaining portion 33 connects the boss portion 31 and the first cylindrical portion 32. Multiple retaining portions 33 are spaced apart from each other in the circumferential direction. The retaining portion 33 has a retaining recess 331 configured to hold a coil spring. The retaining recess 331 extends axially. The retaining recess 331 opens to a first side in the axial direction.

[0034] As shown in Figure 4, a first cam portion 36 is positioned on the first rotation direction R1 side of the holding portion 33. The first cam portion 36 is integrally formed with the holding portion 33. A second cam portion 37 is positioned on the second rotation direction R2 side of the holding portion 33. The second cam portion 37 and the first cam portion 36 are formed from a single component with the holding portion 33.

[0035] The first cam portion 36 has a first cam surface 361. The first cam surface 361 faces the first rotational direction R1 and also faces the second axial direction. That is, the first cam surface 361 extends at an inclination with respect to the axial direction and the first rotational direction.

[0036] The second cam portion 37 has a second cam surface 371. The second cam surface 371 faces the second rotational direction R2 and also faces the first axial direction. That is, the second cam surface 371 extends at an inclination with respect to the axial direction and the second rotational direction. The second cam surface 371 faces opposite to the first cam surface 361.

[0037] As shown in Figure 2, the first flange portion 34 extends radially outward from the first cylindrical portion 32. More specifically, the first flange portion 34 extends radially outward from the first axial end of the first cylindrical portion 32. 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 an annular shape extending in the circumferential direction. The pressure-receiving surface 35 is located on the outer circumference of the clutch center 3. The pressure-receiving surface 35 is located on the first axial side with respect to the pressing surface 401, which will be described later.

[0038] The clutch center 3 has a plurality of inner contact surfaces 38. The inner contact surfaces 38 face radially inward. As shown in Figures 2 and 3, the clutch center 3 has a plurality of protrusions 39 that project radially inward from the inner circumferential surface of the first cylindrical portion 32. The plurality of protrusions 39 are spaced apart in the circumferential direction. The radially inward-facing surfaces of these protrusions 39 are the inner contact surfaces 38.

[0039] [Pressure Plate] Figure 5 is a plan view of the pressure plate 4 as seen from the first side in the axial direction, and Figure 6 is a perspective view of the pressure plate. As shown in Figures 2, 4, 5, and 6, the pressure plate 4 is arranged to be movable in the axial direction. That is, the pressure plate 4 is axially relative to the clutch center 3. The pressure plate 4 is arranged to be rotatable about the rotation axis O.

[0040] The pressure plate 4 has a base portion 41, multiple column portions 42, multiple space portions 43, multiple guide walls 45, multiple connecting reinforcement portions 46, multiple third cam portions 47, multiple fourth cam portions 48, a second cylindrical portion 49, a second flange portion 40, and a pressing surface 401.

[0041] As shown in Figures 5 and 6, the multiple base portions 41 are spaced apart from each other in the circumferential direction. The column portions 42 extend from the base portions 41 to the first axial direction. The column portions 42 extend through the clutch center 3 to the first axial direction. More specifically, the column portions 42 extend between a pair of adjacent retaining portions 33 to the first axial direction. The column portions 42 have screw holes 421 that penetrate in the axial direction (see Figure 2). The multiple column portions 42 are spaced apart from each other in the circumferential direction. The column portions 42 are cylindrical.

[0042] The space 43 is positioned between the column portions 42 in the circumferential direction. The space 43 is also positioned between the base portions 41 in the circumferential direction. The space 43 penetrates the pressure plate 4 in the axial direction. The holding portion 33 of the clutch center 3 is positioned within this space 43. By positioning the holding portion 33 within the space 43 in this way, the holding portion 33 can be positioned as far as possible on the second axial side. For example, the surface of the holding 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 401. As a result, the axial dimension of the coil spring 9 can be increased.

[0043] The opening 44 is located in the center of the pressure plate 4. The opening 44 penetrates the pressure plate 4 in the axial direction. Multiple spaces 43 are connected to the opening 44. That is, the multiple spaces 43 communicate with each other through the opening 44. The boss portion 31 of the clutch center 3 is located within this opening 44. The pressure plate 4 is spaced radially away from the boss portion 31. That is, the boss portion 31 of the clutch center 3 is not in contact with the pressure plate 4.

[0044] The guide wall 45 extends from the base portion 41 to the first axial direction. Multiple guide walls 45 are arranged at intervals in the circumferential direction. The guide wall 45 is positioned radially outward relative to the column portion 42. In a radial view, the guide wall 45 overlaps with the column portion 42. The guide wall 45 has an inner guide surface 451 facing radially inward and an outer guide surface 452 facing radially outward. The inner guide surface 451 is positioned to overlap with the outer guide surface 452 in a radial view.

[0045] The tip of the guide wall 45 is positioned on the first axial side relative to the tip of the column 42. That is, the axial dimension of the guide wall 45 is larger than the axial dimension of the column 42. The portion of the guide wall 45 that is positioned on the first axial side relative to the column 42 is designated as the tip portion 453.

[0046] The guide wall 45 has a larger circumferential dimension than the column 42. Therefore, in a radial view, the column 42 is completely covered by the guide wall 45.

[0047] The outer guide surface 452 of the guide wall 45 is in contact with the inner contact surface 38 of the clutch center 3. In this way, the pressure plate 4 is positioned radially relative to the clutch center 3 by the outer guide surface 452 contacting the inner contact surface 38.

[0048] The connecting reinforcement section 46 extends from the base section 41 in the first axial direction. The connecting reinforcement section 46 is positioned between the column section 42 and the guide wall 45. The connecting reinforcement section 46 connects the column section 42 and the guide wall 45. The connecting reinforcement section 46 has a smaller axial dimension than the column section 42 and the guide wall 45. Also, the connecting reinforcement section 46 has a smaller circumferential dimension than the column section 42 and the guide wall 45. Because this connecting reinforcement section 46 is connected to the column section 42, it is not possible to mistakenly attach the coil spring 9 to the column section 42.

[0049] The third cam portion 47 is positioned on the second rotation direction R2 side relative to the column portion 42. The fourth cam portion 48 is positioned on the first rotation direction R1 side relative to the column portion 42. The third cam portion 47 and the fourth cam portion 48 are integrally formed with the column portion 42. More specifically, the third cam portion 47, the fourth cam portion 48, and the column portion 42 are integrally formed with the column portion 42 via the base portion 41. The third cam portion 47, the fourth cam portion 48, and the base portion 41 are integrally formed with the second cylindrical portion 49.

[0050] As shown in Figure 4, the third cam portion 47 has a third cam surface 471. The third cam surface 471 faces the first axial direction and also faces the second rotational direction R2. That is, the third cam surface 471 is inclined with respect to the axial direction and the second rotational direction. The third cam surface 471 faces the first cam surface 361. The third cam surface 471 extends substantially parallel to the first cam surface 361.

[0051] The fourth cam portion 48 has a fourth cam surface 481. The fourth cam surface 481 faces the second axial direction and the first rotational direction R1. That is, the fourth cam surface 481 is inclined with respect to the axial direction and the first rotational direction. The fourth cam surface 481 faces opposite the third cam surface 471. The fourth cam surface 481 faces the second cam surface 371. The fourth cam surface 481 extends approximately parallel to the second cam surface 371.

[0052] As shown in Figures 5 and 6, the second cylindrical portion 49 extends in the axial direction. The second cylindrical portion 49 is positioned radially outward from the multiple base portions 41, multiple column portions 42, and multiple guide walls 45, etc., so as to surround them.

[0053] The second cylindrical portion 49 has a plurality of grooves 491 formed on its outer circumferential surface. The grooves 491 extend in the axial direction. The plurality of grooves 491 are spaced apart from each other in the circumferential direction.

[0054] The second flange portion 40 extends radially outward from the second cylindrical portion 49. The surface of the second flange portion 40 facing the first axial side becomes the pressing surface 401. That is, the pressing surface 401 faces the first axial side. The pressing surface 401 is annular and extends in the circumferential direction. The pressing surface 401 is located on the outer circumference of the pressure plate 4.

[0055] As shown in Figure 2, the pressing surface 401 is positioned on the second axial side relative to the pressure-receiving surface 35. In an axial view, the pressing surface 401 overlaps with the pressure-receiving surface 35.

[0056] [Clutch section] The clutch unit 5 is configured to transmit or interrupt power between the clutch housing 2 and the clutch center 3. The clutch unit 5 is located between the clutch center 3 and the pressure plate 4. More specifically, the clutch unit 5 is located between the pressure receiving surface 35 and the pressing surface 401.

[0057] The clutch section 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 in shape. The first clutch plates 51 and the second clutch plates 52 are arranged between the pressure receiving surface 35 and the pressing surface 401. The first clutch plates 51 and the second clutch plates 52 are arranged alternately in the axial direction.

[0058] The first clutch plate 51 is axially movable relative to the clutch housing 2 but cannot rotate relative to it. That is, the first clutch plate 51 rotates integrally with the clutch housing 2. In detail, a plurality of engaging protrusions projecting radially outward are formed on the outer circumference of the first clutch plate 51. These engaging protrusions engage with notches formed in the cylindrical portion 22 of the clutch housing 2. Friction material is attached to both sides of the first clutch plate 51.

[0059] The second clutch plate 52 has a plurality of engaging protrusions that project radially inward at its inner circumferential end. These engaging protrusions engage with grooves (not shown) formed in the first cylindrical portion 32 of the clutch center 3. Therefore, the second clutch plate 52 is axially movable relative to the clutch center 3 but cannot rotate relative to it. In other words, the second clutch plate 52 rotates integrally with the clutch center 3.

[0060] [Support plate] The support plate 6 is positioned on the first axial side relative to the pressure plate 4. The support plate 6 is attached to the tip of the column portion 42 (the upper end in Figure 2). Specifically, a bolt 8 fastens the pressure plate 4 and the support plate 6 together. The bolt 8 is screwed into the threaded hole 421 of the column portion 42 through a through hole in the support plate 6. As a result, the support plate 6 rotates integrally with the pressure plate 4.

[0061] As shown in Figures 1 and 7, the support plate 6 is disc-shaped with an opening 61 in the center. The support plate 6 has an outer peripheral surface that abuts against the inner guide surface 451 of the guide wall 45. The support plate 6 is positioned radially by this abutment of the outer peripheral surface against the guide wall 45. The tip surface of the guide wall 45 is positioned substantially at the same location in the axial direction as the surface of the support plate 6 facing the first axial side.

[0062] The outer circumferential surface of the support plate 6 has a plurality of outer contact surfaces 62 and a plurality of gripping surfaces 63. The outer circumferential surface of the support plate 6 also has a plurality of non-contact surfaces 64. The outer contact surfaces 62 and non-contact surfaces 64 are arranged alternately in the circumferential direction. The gripping surfaces 63 are positioned between the outer contact surfaces 62 and non-contact surfaces 64.

[0063] The outer contact surface 62 is in contact with the guide wall 45. More specifically, the outer contact surface 62 faces radially outward. This outer contact surface 62 is in contact with the inner guide surface 451 of the guide wall 45, which faces radially inward. The outer contact surface 62 is positioned radially outward with respect to the through hole 65 for passing the bolt 8. In a radial view, the outer contact surface 62 overlaps with the through hole 65.

[0064] The gripping surface 63 is positioned adjacent to the outer contact surface 62 in the circumferential direction. Specifically, the outer contact surface 62 is positioned between a pair of gripping surfaces 63 in the circumferential direction. The gripping surface 63 is positioned radially inward relative to the outer contact surface 62. That is, the gripping surface 63 is formed by recessing the outer circumferential surface of the support plate 6 radially inward. Therefore, the outer diameter of the gripping surface 63 is smaller than the outer diameter of the outer contact surface 62. The gripping surface 63 is not in contact with the guide wall 45. Also, the gripping surface 63 is not in contact with any other member.

[0065] The gripping surface 63 is the surface that is gripped by the chuck when performing cutting or other machining operations. By gripping this gripping surface 63 with the chuck, the outer contact surface 62 and the inner circumferential surface defining the opening 61 can be cut simultaneously.

[0066] The non-contact surface 64 is not in contact with the guide wall 45. Furthermore, the non-contact surface 64 is not in contact with any other member. The outer diameter of the non-contact surface 64 is approximately the same as the outer diameter of the outer contact surface 62. The non-contact surface 64 is positioned radially outward with respect to the gripping surface 63. That is, the outer diameter of the non-contact surface 64 is larger than the outer diameter of the gripping surface 63. The circumferential position of the non-contact surface 64 is the same as that of the coil spring 9.

[0067] [Coil spring] As shown in Figures 1 and 2, the coil springs 9 are arranged in the circumferential direction at a distance from the column portions 42. More specifically, multiple coil springs 9 and multiple column portions 42 are arranged alternately in the circumferential direction. In the axial direction, the coil springs 9 are arranged in a compressed state between the clutch center 3 and the support plate 6.

[0068] The coil spring 9 has a first end 91 and a second end 92 in the axial direction. The first end 91 is the first end in the axial direction, and the second end 92 is the second end in the axial direction. The first end 91 of the coil spring 9 is in contact with the support plate 6. The second end 92 of the coil spring 9 is held by the holding portion 33 of the clutch center 3. In detail, the second end 92 is located in a holding recess 331 of the holding portion 33. The movement of the coil spring 9 in the radial and circumferential directions is restricted by the holding of the second end 92 by the holding portion 33.

[0069] The coil spring 9 biases the pressure plate 4 axially to the first side via the support plate 6. As a result, the pressing surface 401 is biased to approach the pressure receiving surface 35, the clutch unit 5 enters the clutch-on state, and power is transmitted. The release member moves the pressure plate 4 axially to the second side against the biasing force of the coil spring 9, causing the pressing surface 401 to move away from the pressure receiving surface 35. As a result, the clutch unit 5 enters the clutch-off state, and the transmission of power between the clutch housing 2 and the clutch center 3 is interrupted.

[0070] [Operation of the cam mechanism] When the pressure plate 4 rotates relative to the clutch center 3 in the first rotational direction R1 during acceleration, the second cam surface 371 and the fourth cam surface 481 push against each other, causing the fourth cam portion 48 to move axially towards the first side. As a result, the pressing surface 401 moves closer to the pressure receiving surface 35, increasing the coupling force of the clutch portion 5.

[0071] On the other hand, when the clutch center 3 rotates relative to the pressure plate 4 in the first rotational direction R1, such as during deceleration, the first cam surface 361 and the third cam surface 471 push against each other, and the third cam portion 47 moves to the second side in the axial direction. As a result, the pressing surface 401 moves away from the pressure receiving surface 35, and the coupling force of the clutch portion 5 is reduced.

[0072] [Differentiation] Although embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications are possible without departing from the spirit of the invention. Furthermore, the following modifications can basically be applied simultaneously.

[0073] (a) In the above embodiment, the pressure plate 4 has a base portion 41, but the configuration of the pressure plate 4 is not limited thereto. For example, the pressure plate 4 does not have to have a base portion 41. In this case, the column portion 42 and the guide wall 45, etc., extend from the second cylindrical portion 49 to the first axial side.

[0074] (b) In the above embodiment, the pressure plate 4 corresponds to the first rotating body of the present invention and the clutch center 3 corresponds to the second rotating body of the present invention, but the configuration of the clutch device 100 is not limited thereto. Specifically, as shown in Figure 8, the clutch center 3 may have a column portion 42 and a space portion 43, and a support plate 6 may be attached to the clutch center 3. Furthermore, the pressure plate 4 may have a holding portion 33. In other words, the clutch device 100 may be configured such that the clutch center 3 corresponds to the first rotating body of the present invention and the pressure plate 4 corresponds to the second rotating body of the present invention. [Explanation of symbols]

[0075] 3: Clutch Center 31: Boss Department 33: Holding part 38: Inner contact surface 4: Pressure plate 42:Column part 43: Space part 45: Guide wall 451: Inner guide surface 452: Outer guide surface 46: Connecting reinforcement section 5: Clutch section 6: Support Plate 61: Opening 62:Outer contact surface 63: Grasping surface 65: Through hole 9: Coil spring 91: First end 92:Second end 100: Clutch device

Claims

1. A clutch device configured to be rotatable, A first rotating body is rotatably arranged, having a plurality of columnar portions extending to the first side in the axial direction, and a plurality of spaces arranged between the columnar portions in the circumferential direction and penetrating in the axial direction, A support plate attached to the tip of the column portion, A second rotating body having a holding portion positioned within the aforementioned space and being rotatably arranged, A clutch portion is disposed between the first rotating body and the second rotating body, A biasing member having a first end that contacts the support plate and a second end that is held by the holding portion, A clutch device equipped with a clutch mechanism.

2. The second rotating body has a boss portion extending in the axial direction, The first rotating body is arranged radially at a distance from the boss portion. The clutch device according to claim 1.

3. The first rotating body has a pressing surface facing the first side in the axial direction, The second rotating body has a pressure-receiving surface facing the second side in the axial direction, The clutch portion is positioned between the pressing surface and the pressure receiving surface. The first rotating body is arranged to be movable in the axial direction, The clutch device according to claim 1.

4. The first rotating body has an opening that penetrates axially in its central portion, The aforementioned plurality of spaces are connected to the opening, The clutch device according to claim 1.

5. The first rotating body has a pair of cam portions on both sides in the circumferential direction relative to the column portion. The clutch device according to claim 1.

6. The holding portion has a surface facing the second axial side that is located further axially than the first rotating body. The clutch device according to claim 1.

7. The biasing member has an end face on the second axial side that is located on the second axial side of the pressing surface. The clutch device according to claim 3.

8. The first rotating body has a plurality of guide walls arranged radially outward from the column portion, The guide wall has an outer guide surface facing radially outward, The second rotating body has an inner contact surface that faces radially inward and contacts the outer guide surface, The clutch device according to claim 1.

9. The guide wall has an inner guide surface facing radially inward, The support plate has an outer peripheral surface that contacts the inner guide surface, The clutch device according to claim 8.

10. The inner guide surface is positioned to overlap with the outer guide surface in a radial view. The clutch device according to claim 9.

11. The support plate is disc-shaped with an opening in the center, The outer circumferential surface of the support plate has a plurality of outer contact surfaces that abut against the inner guide surface, and a plurality of gripping surfaces that are arranged radially inward from the outer contact surfaces. The clutch device according to claim 9 or 10.

12. The support plate has a plurality of through holes arranged in the circumferential direction, The outer contact surface overlaps with the through hole in a radial view. The clutch device according to claim 11.

13. The first rotating body has a connecting reinforcing portion that extends to the first axial side and connects the column portion and the guide wall. The clutch device according to claim 8.

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