Clutch device

Abstract

To prevent abrasion of a support plate.SOLUTION: A clutch device includes a first rotating body, a second rotating body, a support plate, a coil spring, and a spring seat. The first rotating body has a pillar extending toward a first side in an axial direction. The second rotating body is arranged movably in the axial direction with respect to the first rotating body. The support plate is attached to the pillar. The coil spring is disposed between the second rotating body and the support plate in the axial direction. The coil spring is arranged at an interval from the pillar in a circumferential direction. The spring seat is arranged between the coil spring and the support plate. The spring seat extends in the circumferential direction along the support plate. The spring seat has an annular shape.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] Generally, motorcycles, buggies, and other motorcycles use a clutch device to transmit or cut off power from the engine to the transmission. The clutch device includes a clutch center, a pressure plate, a support plate, a clutch unit, a coil spring, and a cam mechanism (see Patent Document 1). The clutch center includes a pillar portion. The support plate is attached to the tip of the pillar portion.

[0003] The coil spring is disposed between the pressure plate and the support plate. The coil spring biases the pressure plate in the axial direction. The cam mechanism is configured to move the pressure plate in the axial direction relative to the clutch center when the clutch center and the pressure plate rotate relative to each other. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2017-101811 Summary of the Invention [Problem to be solved by the invention]

[0005] In the clutch device configured as described above, when the clutch center and the pressure plate rotate relative to each other, the end of the coil spring slides on the support plate, causing wear on the support plate.

[0006] An object of the present invention is to prevent wear of the support plate. [Means for solving the problem]

[0007] The clutch device according to a first aspect includes a first rotor, a second rotor, a support plate, a coil spring, and a spring seat. The first rotor has a pillar portion extending to a first side in the axial direction. The second rotor is arranged to be axially movable relative to the first rotor. The support plate is attached to the pillar portion. The coil spring is arranged between the second rotor and the support plate in the axial direction. The coil spring is arranged at a distance from the pillar portion in the circumferential direction. The spring seat is arranged between the coil spring and the support plate. The spring seat extends in the circumferential direction along the support plate. The spring seat is annular.

[0008] According to this configuration, the annular spring seat extending in the circumferential direction is disposed between the coil spring and the support plate, thereby preventing wear of the support plate.

[0009] The clutch device according to the second aspect is the clutch device according to the first aspect, and is configured as follows: The spring seat has a first region and a second region. The first region is a region that abuts against the coil spring. The second region is a region that is sandwiched between the pillar portion and the support plate.

[0010] A clutch device according to a third aspect is the clutch device according to the second aspect, further comprising a bolt. The bolt fastens the pillar portion and the support plate. The pillar portion has a threaded hole into which the bolt screws. The spring seat has a through hole in the second region for passing the bolt. The through hole is sized so as not to pass the pillar portion through.

[0011] A clutch device according to a fourth aspect is the clutch device according to any one of the first to third aspects, and is configured as follows: The plate thickness of the spring seat is thinner than the plate thickness of the support plate.

[0012] 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 support plate has a through hole, and the spring seat has a claw portion disposed in the through hole.

[0013] A clutch device according to a sixth aspect is the clutch device according to the fifth aspect, and is configured as follows: The claw portion penetrates the support plate via the through hole and protrudes from the support plate to a first side in the axial direction.

[0014] A clutch device according to a seventh aspect is the clutch device according to the fifth or sixth aspect, and is configured as follows: The claw portion has a first bent portion that engages with the through hole.

[0015] A clutch device according to an eighth aspect is the clutch device according to the seventh aspect, and is configured as follows: The claw portion has a second bent portion bent in the opposite direction to the first bent portion.

[0016] A clutch device according to a ninth aspect is the clutch device according to any one of the first to eighth aspects, and is configured as follows: The support plate is made of iron.

[0017] A clutch device according to a tenth aspect is the clutch device according to any one of the first to ninth aspects, further comprising a cam mechanism. The cam mechanism is configured to move the second rotor in the axial direction relative to the first rotor when the second rotor rotates relative to the first rotor.

[0018] A clutch device according to an eleventh aspect is the clutch device according to any one of the first to tenth aspects, and is configured as follows: The pawls are arranged so as not to overlap with the coil springs when viewed in the radial direction. [Effects of the Invention]

[0019] According to the present invention, wear of the support plate can be prevented. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. [Figure 2] Cross-sectional view of line II-II in Figure 1. [Figure 3] FIG. [Figure 4] Plan view of the spring seat. [Figure 5] FIG. [Figure 6] FIG. 10 is a perspective view of a support plate with a spring seat attached thereto. [Figure 7] FIG. 10 is a front view of the support plate with the spring seat attached. [Figure 8] Cross-sectional view of line VIII-VIII in Figure 1. [Figure 9] FIG. 10 is a cross-sectional view of a spring seat according to a modified example. [Figure 10] FIG. 10 is a cross-sectional view of a spring seat according to a modified example. [Figure 11] FIG. 10 is a cross-sectional view of a clutch device according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0021] The clutch device 100 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 rotation direction R1 refers to the direction in which the clutch device 100 rotates, and the second rotation direction R2 refers to the rotation direction opposite to the first rotation direction R1.

[0022] [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 or block power from a drive source (e.g., an engine) to drive wheels. The clutch device 100 is configured to transmit power in a first rotational direction R1 (counterclockwise in FIG. 1). The clutch device 100 is configured to be rotatable. Specifically, the clutch device 100 rotates in the first rotational direction R1 around a rotation axis O.

[0023] The clutch device 100 has a clutch housing 2, a clutch center 3 (an example of a first rotating body), a pressure plate 4 (an example of a second rotating body), a clutch portion 5, a support plate 6, a plurality of bolts 7, a plurality of coil springs 8, a spring seat 9, and a cam mechanism 13 (see Figure 8).

[0024] [Clutch housing] As shown in Figure 2, the clutch housing 2 is arranged to be rotatable around a rotation axis O. 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 an engine (not shown) is input. The input gear 10 meshes with a drive gear (not shown) fixed to a crankshaft on the engine side.

[0025] The disk 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 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 plurality of notches 221 are arranged at intervals from one another in the circumferential direction.

[0026] [Clutch center] The clutch center 3 is disposed on a first axial side of the clutch housing 2. The clutch center 3 is disposed radially inward of the cylindrical portion 22 of the clutch housing 2. The clutch center 3 is disposed rotatably about the rotation axis O. The clutch center 3 is configured to rotate relative to the clutch housing 2. The clutch center 3 is disposed immovably in the axial direction.

[0027] The clutch center 3 has a first boss portion 31 , a plurality of base portions 32 , a plurality of pillar portions 33 , a plurality of recesses 34 , a first cylindrical portion 35 , a first flange portion 36 , and a pressure receiving surface 37 .

[0028] The first boss portion 31 extends in the axial direction. The first boss portion 31 is cylindrical. The first boss portion 31 has a spline hole 31a extending in the axial direction in its center. An input shaft (not shown) of the transmission is spline-engaged with the spline hole 31a. A thrust plate 14 is provided between the first boss portion 31 and the input gear 10 in the axial direction.

[0029] Each base portion 32 extends radially outward from the outer circumferential surface of the first boss portion 31. Each base portion 32 is disposed radially outward relative to the first boss portion 31. The base portions 32 are disposed at intervals from one another in the circumferential direction. Each base portion 32 is connected to the first cylindrical portion 35.

[0030] The pillar portion 33 extends from the base portion 32 toward the first side in the axial direction. The pillar portion 33 is cylindrical. The pillar portion 33 has a screw hole 331 that penetrates in the axial direction.

[0031] The recesses 34 are spaced apart from one another in the circumferential direction. The recesses 34 are alternately arranged with the base portions 32 in the circumferential direction. Each recess 34 opens to a first axial side. In this embodiment, each recess 34 penetrates in the axial direction and therefore also opens to a second axial side.

[0032] The first cylindrical portion 35 extends in the axial direction. The first cylindrical portion 35 has a plurality of external teeth. Each external tooth is formed on the outer circumferential surface of the first cylindrical portion 35. Each external tooth extends in the axial direction. The first cylindrical portion 35 is disposed radially outward from each base portion 32. Each base portion 32 connects the first boss portion 31 and the first cylindrical portion 35.

[0033] The first flange portion 36 extends radially outward from the first cylindrical portion 35. More specifically, the first flange portion 36 extends radially outward from the end portion of the first cylindrical portion 35 on the second axial side. The surface of the first flange portion 36 facing the first axial side is the pressure-receiving surface 37. In other words, the pressure-receiving surface 37 faces the first axial side. The pressure-receiving surface 37 is annular and extends circumferentially. The pressure-receiving surface 37 is arranged on the outer periphery of the clutch center 3.

[0034] [Pressure plate] The pressure plate 4 is arranged so as 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 so as to be rotatable about the rotation axis O. The pressure plate 4 is rotatable relative to the clutch center 3 within a predetermined range. The pressure plate 4 is arranged between the clutch center 3 and the support plate 6 in the axial direction.

[0035] The pressure plate 4 has a second boss portion 41 , a plurality of protrusions 42 , a second flange portion 43 , a pressing surface 44 , and a second cylindrical portion 45 .

[0036] The second boss portion 41 is cylindrical and extends in the axial direction. The second boss portion 41 is configured so that a release mechanism (not shown) can be attached thereto.

[0037] Each of the protrusions 42 is disposed radially outward from the second boss portion 41. The protrusions 42 are disposed at intervals from one another in the circumferential direction. Each of the protrusions 42 is disposed within each of the recesses 34. Each of the protrusions 42 protrudes toward the second axial side.

[0038] Each of the protrusions 42 extends radially outward from the second boss 41. The protrusions 42 have a retaining recess 424 configured to retain the coil spring 8. The retaining recess 424 extends in the axial direction. The retaining recess 424 opens to a first axial side.

[0039] The second flange portion 43 is disposed radially outward from the protrusion 42. The surface of the second flange portion 43 facing the second axial side is the pressing surface 44. In other words, the pressing surface 44 faces the second axial side. The pressing surface 44 is annular and extends in the circumferential direction. The pressing surface 44 is disposed on the outer periphery of the pressure plate 4.

[0040] The pressing surface 44 is disposed on a first axial side of the pressure-receiving surface 37. When viewed in the axial direction, the pressing surface 44 overlaps with the pressure-receiving surface 37.

[0041] The second cylindrical portion 45 extends from the inner peripheral end of the second flange portion 43 to a second side in the axial direction. The second cylindrical portion 45 is disposed adjacent to the first cylindrical portion 35 in the axial direction. The second cylindrical portion 45 is disposed at an interval from the first cylindrical portion 35 in the axial direction.

[0042] The second cylindrical portion 45 has a plurality of external teeth. Each of the external teeth is formed on the outer circumferential surface of the second cylindrical portion 45. Each of the external teeth extends in the axial direction.

[0043] [Clutch section] The clutch portion 5 is configured to transmit and block power between the clutch housing 2 and the clutch center 3. The clutch portion 5 is disposed between the clutch center 3 and the pressure plate 4. More specifically, the clutch portion 5 is disposed between the pressure receiving surface 37 and the pressing surface 44.

[0044] The clutch unit 5 has a plurality of drive plates 51 and a plurality of driven plates 52. The drive plates 51 and the driven plates 52 are annular. The drive plates 51 and the driven plates 52 are arranged between the pressure-receiving surface 37 and the pressing surface 44. The drive plates 51 and the driven plates 52 are arranged alternately in the axial direction.

[0045] Each drive plate 51 is movable in the axial direction but is unable to rotate relative to the clutch housing 2. In other words, each drive plate 51 rotates integrally with the clutch housing 2. More specifically, a plurality of engaging protrusions that protrude radially outward are formed on the outer periphery of each drive plate 51. Each of these engaging protrusions engages with a respective notch 221 formed in the cylindrical portion 22 of the clutch housing 2. Friction material is attached to both sides of each drive plate 51.

[0046] Each driven plate 52 is movable in the axial direction with respect to the clutch center 3 but is non-rotatable relative thereto. That is, each driven plate 52 rotates integrally with the clutch center 3. Specifically, each driven plate 52 has a plurality of internal teeth. Each internal tooth meshes with a corresponding external tooth of the first cylindrical portion 35. Note that some of the multiple driven plates 52 are attached so as to be movable in the axial direction with respect to the pressure plate 4 but non-rotatable relative thereto.

[0047] [Support plate] The support plate 6 is annular and extends in the circumferential direction. The support plate 6 is disposed on a first axial side of the clutch center 3. The support plate 6 is attached to the tip end (upper end in FIG. 2) of the pillar portion 33. More specifically, a bolt 7 fastens the pillar portion 33 to the support plate 6. Therefore, the support plate 6 rotates integrally with the clutch center 3. The bolt 7 is threaded into a screw hole 331 of the pillar portion 33.

[0048] 3 is a perspective view of the support plate 6. As shown in FIG. 3, the support plate 6 has a plurality of first through holes 61 and a plurality of second through holes 62. Each first through hole 61 is configured to allow a bolt 7 to pass therethrough. That is, the bolt 7 passes through the first through hole 61 and screws into the screw hole 331 of the column portion 33.

[0049] Each second through hole 62 is a hole for a claw portion 95 of a spring seat 9, which will be described later. The second through holes 62 are arranged at intervals from one another in the circumferential direction. Note that, although not particularly limited, the second through holes 62 have a smaller diameter than the first through holes 61.

[0050] The upper and lower surfaces of the support plate 6 are flat, that is, the support plate 6 does not have any recessed or protruding portions.

[0051] The support plate 6 is made of iron. Specifically, the support plate 6 is made of steel. More specifically, the support plate 6 is formed from a low-carbon rolled steel plate (such as SPHC or SPCC).

[0052] [Coil spring] As shown in FIG. 2 , the coil spring 8 is disposed in a compressed state in the axial direction between the pressure plate 4 and the support plate 6. The coil spring 8 biases the pressure plate 4 toward the second side in the axial direction. As a result, the pressing surface 44 is biased toward the pressure receiving surface 37, the clutch unit 5 enters a clutch-on state, and power is transmitted. Note that by using the release member to move the pressure plate 4 toward the first side in the axial direction against the biasing force of the coil spring 8, the pressing surface 44 moves away from the pressure receiving surface 37. As a result, the clutch unit 5 enters a clutch-off state, and power transmission between the clutch housing 2 and the clutch center 3 is interrupted.

[0053] The coil springs 8 are arranged at intervals from the pillar portions 33 in the circumferential direction. Specifically, the plurality of coil springs 8 and the plurality of pillar portions 33 are arranged alternately in the circumferential direction. The ends of the coil springs 8 on the second axial side are arranged in the retaining recesses 424 of the pressure plate 4. The coil springs 8 are held by the retaining recesses 424, thereby restricting their movement in the radial and circumferential directions.

[0054] [Spring seat] The spring seat 9 is disposed between the support plate 6 and the coil spring 8. The spring seat 9 prevents the coil spring 8 from coming into contact with the support plate 6.

[0055] Figure 4 is a plan view of the spring seat 9, Figure 5 is a perspective view of the spring seat 9, Figure 6 is a perspective view showing the support plate 6 to which the spring seat 9 is assembled, and Figure 7 is a front view showing the support plate 6 to which the spring seat 9 is assembled.

[0056] As shown in Figures 4 to 7, the spring seat 9 extends in the circumferential direction along the support plate 6. The spring seat 9 is annular. The spring seat 9 has a plurality of first regions 91 and a plurality of second regions 92. The first regions 91 and the second regions 92 are arranged alternately in the circumferential direction.

[0057] The first region 91 is a region that comes into contact with the coil spring 8. The first region 91 is flat and does not have any steps or the like. The coil spring 8 slides on this first region 91 in the circumferential direction.

[0058] The second region 92 is a region sandwiched between the pillar portion 33 and the support plate 6. The spring seat 9 has a third through hole 93 in each second region 92. Each third through hole 93 is configured to allow a bolt 7 to pass through. On the other hand, each third through hole 93 is designed to have dimensions that do not allow the pillar portion 33 to pass through. In other words, the diameter of each third through hole 93 is larger than the diameter of the bolt 7 and smaller than the diameter of the pillar portion 33. As a result, the spring seat 9 is sandwiched between the pillar portion 33 and the support plate 6 around each third through hole 93.

[0059] The spring seat 9 has a main body portion 94 and a plurality of claw portions 95. The main body portion 94 extends in the circumferential direction along the support plate 6. The main body portion 94 is annular. The main body portion 94 has the above-mentioned plurality of first regions 91 and a plurality of second regions 92.

[0060] Each claw portion 95 extends from the main body portion 90 of the spring seat 9 toward a first side in the axial direction. Each claw portion 95 is formed by bending a part of the spring seat 9 toward the first side in the axial direction. Each claw portion 95 is arranged so as not to overlap with the coil spring 8 when viewed in the radial direction.

[0061] Each claw portion 95 is disposed in a second through-hole 62. This allows the spring seat 9 to be positioned relative to the support plate 6. After the spring seat 9 is assembled to the support plate 6, the support plate 6 is attached to the pillar portion 33.

[0062] 6 and 7, each claw 95 penetrates the support plate 6 via the second through-hole 62. The tip of each claw 95 protrudes from the support plate 6 toward the first axial side. This makes it easy to check whether the spring seat 9 is attached to the support plate 6.

[0063] The spring seat 9 is made of iron. More specifically, the spring seat 9 is made of steel. More specifically, the spring seat 9 is formed of carbon tool steel such as SK85. The thickness of the spring seat 9 is thinner than the thickness of the support plate 6. The thickness of the spring seat 9 is, for example, about 0.3 to 1.0 mm.

[0064] [Cam mechanism] Figure 8 is a cross-sectional view taken along line VIII-VIII in Figure 1. As shown in Figure 8, the cam mechanism 13 is configured to move the pressure plate 4 in the axial direction relative to the clutch center 3 when the pressure plate 4 rotates relative to the clutch center 3. Specifically, the cam mechanism 13 is configured to move the pressure plate 4 to a second side in the axial direction when the pressure plate 4 rotates relative to the clutch center 3 in a first rotational direction R1. Furthermore, the cam mechanism 13 is configured to move the pressure plate 4 to a first side in the axial direction when the pressure plate 4 rotates relative to the clutch center 3 in a second rotational direction R2.

[0065] The cam mechanism 13 has a first cam surface 131 and a second cam surface 132. The first cam surface 131 is formed on the clutch center 3. The first cam surface 131 faces in the circumferential direction and is inclined so as to face the second axial side. The first cam surface 131 faces in the second rotational direction R2.

[0066] The second cam surface 132 is formed on the pressure plate 4. The second cam surface 132 faces the first cam surface 131. The second cam surface 132 faces in the circumferential direction and is inclined so as to face the first axial side. Specifically, the second cam surface 132 faces in the first rotational direction R1.

[0067] The cam mechanism 13 has a third cam surface 133 and a fourth cam surface 134. The third cam surface 133 is formed on the clutch center 3. The third cam surface 133 faces in the circumferential direction and is inclined so as to face the first axial side. More specifically, the third cam surface 133 faces in the first rotational direction R1. The third cam surface 133 faces away from the first cam surface 131.

[0068] The fourth cam surface 134 is formed on the pressure plate 4. The fourth cam surface 134 faces the third cam surface 133. The fourth cam surface 134 faces in the circumferential direction and is inclined so as to face the second axial side. Specifically, the fourth cam surface 134 faces in the second rotational direction R2.

[0069] The first cam surface 131 and the third cam surface 133 define the side surfaces of the recess 34. More specifically, the first cam surface 131 and the third cam surface 133 define the circumferential side surfaces of the recess 34. The first cam surface 131 defines the side surface of the recess 34 on the first rotation direction R1 side. The third cam surface 133 defines the side surface of the recess 34 on the second rotation direction R2 side.

[0070] Each protrusion 42 has a second cam surface 132 and a fourth cam surface 134. The second cam surface 132 and the fourth cam surface 134 define the side surfaces of the protrusion 42. More specifically, the second cam surface 132 and the fourth cam surface 134 define the circumferential side surfaces of the protrusion 42. The second cam surface 132 defines the side surface of the protrusion 42 on the first rotation direction R1 side. The fourth cam surface 134 defines the side surface of the protrusion 42 on the second rotation direction R2 side.

[0071] [Cam mechanism operation] When the pressure plate 4 rotates relative to the clutch center 3 in the first rotation direction R1 during acceleration, the first cam surface 131 and the second cam surface 132 press against each other, and the pressure plate 4 moves toward the second axial side. As a result, the pressing surface 44 moves closer to the pressure-receiving surface 37, and the coupling force of the clutch portion 5 increases.

[0072] 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 third cam surface 133 and the fourth cam surface 134 press against each other, and the pressure plate 4 moves axially toward the first side. As a result, the pressing surface 44 moves away from the pressure-receiving surface 37, and the coupling force of the clutch portion 5 is reduced.

[0073] [Variations] Although the embodiments of the present invention have 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.

[0074] (a) As shown in FIG. 9, the claw portion 95 may have a first bent portion 951. The first bent portion 951 is formed by bending the tip of the claw portion 95 extending in the axial direction. The first bent portion 951 is configured to engage with the second through-hole 62 of the support plate 6. Therefore, the first bent portion 951 catches, and the spring seat 9 attached to the support plate 6 can be prevented from falling off.

[0075] 10, the claw portion 95 may have a second bent portion 952 in addition to the first bent portion 951. The second bent portion 952 is formed by bending the tip of the claw portion 95 in the opposite direction to the first bent portion 951. This makes it easier to insert the claw portion 95 into the second through hole 62, thereby improving the ease of assembling the spring seat 9 to the support plate 6.

[0076] (b) In the above embodiment, the clutch center 3 is exemplified as the first rotating body and the pressure plate 4 is exemplified as the second rotating body, but the configuration of the clutch device is not limited to this. For example, as shown in FIG. 11 , the first rotating body may be the pressure plate 4 and the second rotating body may be the clutch center 3. In this case, the pressure plate 4 has a pillar portion 33. The support plate 6 is attached to the pressure plate 4. The pressure plate 4 is movable in the axial direction, while the clutch center 3 is immovable in the axial direction. In other words, the clutch center 3 is arranged so as to be movable in the axial direction relative to the pressure plate 4. [Explanation of symbols]

[0077] 3: Clutch center 4: Pressure plate 6: Support plate 7: Bolt 8: Coil spring 9: Spring seat 13: Cam mechanism 33:Column part 62: Second through hole 91: 1st area 92:Second area 93: Third through hole 95: Claw part 100: Clutch device 331: screw hole 951: First bending section 952: Second bending section

Claims

1. a first rotor having a column portion extending to a first side in the axial direction; a second rotating body arranged to be movable in the axial direction relative to the first rotating body; a support plate attached to the column; a coil spring that is disposed between the second rotor and the support plate in the axial direction and that is spaced apart from the column portion in the circumferential direction; an annular spring seat disposed between the coil spring and the support plate and extending in a circumferential direction along the support plate; A clutch device comprising:

2. The spring seat has a first region that contacts the coil spring and a second region that is sandwiched between the pillar portion and the support plate. The clutch device according to claim 1.

3. Further, a bolt is provided to fasten the column portion and the support plate, The pillar portion has a screw hole into which the bolt is screwed, the spring seat has a through hole in the second region for passing the bolt therethrough; The through hole is sized so as not to allow the post portion to pass therethrough.

3. The clutch device according to claim 2.

4. The plate thickness of the spring seat is thinner than the plate thickness of the support plate. The clutch device according to claim 1.

5. the support plate has a through hole, The spring seat has a claw portion disposed in the through hole. The clutch device according to claim 1.

6. the claw portion penetrates the support plate through the through hole and protrudes from the support plate to a first side in the axial direction; 6. The clutch device according to claim 5.

7. The claw portion has a first bent portion that engages with the through hole.

6. The clutch device according to claim 5.

8. The claw portion has a second bent portion bent in the opposite direction to the first bent portion.

8. The clutch device according to claim 7.

9. The support plate is made of iron. The clutch device according to claim 1.

10. a cam mechanism configured to move the second rotor in an axial direction relative to the first rotor when the second rotor rotates relative to the first rotor, The clutch device according to claim 1.

11. The claw portion is arranged so as not to overlap with the coil spring when viewed in the radial direction. The clutch device according to claim 1.

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