Centrifugal clutch device and pulley device

Abstract

To inhibit deformation of each clutch plate.SOLUTION: A centrifugal clutch device includes: an input member 2; an output member 3; a centrifugal element 5; a biasing member 7; first and second clutch plates 41, 42; and a cam mechanism 6. The centrifugal element 5 rotates with the input member 2 and receives a centrifugal force. The biasing member 7 is disposed spaced apart from the centrifugal element 5 in an axial direction. The first and second clutch plates 41, 42 are disposed between the centrifugal element 5 and the biasing member 7. The first clutch plate 41 integrally rotates with the input member 2. The second clutch plate 42 integrally rotates with the output member 3. The cam mechanism 6 is configured to convert the centrifugal force of the centrifugal element 5 into a thrust force for moving the centrifugal element 5 toward the biasing member. The biasing member 7 contacts with the first clutch plate 41 at an outer periphery part of a contact surface 43 between the first clutch plate 41 and the second clutch plate 42.SELECTED DRAWING: Figure 4

Description

Technical Field

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

Background Art

[0002] A centrifugal clutch device is configured to transmit torque from an engine to a drive wheel when the rotational speed of the engine or the like reaches a predetermined value or more. Such a centrifugal clutch device is mainly used for a scooter-type motorcycle or the like.

[0003] For example, in the centrifugal clutch device disclosed in Patent Document 1, a plurality of clutch plates are arranged between a centrifugal weight and a disc spring. When the centrifugal clutch device rotates, a centrifugal force acts on the centrifugal weight, and the centrifugal weight moves radially outward along the cam surface and also moves toward the disc spring. As a result, torque is transmitted by sandwiching the plurality of clutch plates between the centrifugal weight and the disc spring.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the above-described centrifugal clutch device, the disc spring biases the clutch plate inward in the radial direction, while the centrifugal weight presses the clutch plate outward in the radial direction. There is a possibility that the clutch plate may be deformed by the load acting on the clutch plate, and the transmitted torque through the clutch plate may decrease.

[0006] Therefore, an object of the present invention is to suppress deformation of each clutch plate.

Means for Solving the Problems

[0007] The centrifugal clutch device according to the first aspect of the present invention includes an input member, an output member, a centrifugal member, a biasing member, a first clutch plate, a second clutch plate, and a cam mechanism. The input member is rotatably arranged. The output member is arranged so as to be relatively rotatable with respect to the input member. The centrifugal member rotates together with the input member and receives centrifugal force. The biasing member is arranged at an axial interval from the centrifugal member. The first clutch plate is arranged between the centrifugal member and the biasing member. The first clutch plate rotates integrally with the input member. The second clutch plate is arranged between the centrifugal member and the biasing member so as to face the first clutch plate. The second clutch plate rotates integrally with the output member. The cam mechanism is configured to convert the centrifugal force of the centrifugal member into a thrust force of the centrifugal member toward the biasing member. The biasing member abuts on the first clutch plate or the second clutch plate at the outer peripheral portion of the contact surface between the first clutch plate and the second clutch plate.

[0008] According to this configuration, since the biasing member biases the first clutch plate or the second clutch plate radially outward, it is possible to suppress deformation of the first and second clutch plates due to the load acting on the first and second clutch plates.

[0009] Preferably, the centrifugal member is arranged at an initial position when the centrifugal clutch device stops, and is configured to move to an operating position when the centrifugal clutch device operates. The operating position is radially outside the initial position.

[0010] Preferably, when the centrifugal member is at the initial position, the center of the centrifugal member is arranged radially inside the center of the contact surface.

[0011] Preferably, when the centrifugal member is at the operating position, the centrifugal member abuts on the first clutch plate or the second clutch plate radially outside the center of the contact surface.

[0012] Preferably, the biasing member is a disc spring. The inner peripheral edge of the biasing member abuts against the first clutch plate or the second clutch plate.

[0013] Preferably, the centrifugal clutch device further includes an outer cylindrical portion and a support portion. The outer cylindrical portion is disposed so as to cover the first clutch plate and the second clutch plate. The support portion projects radially inward from the inner peripheral surface of the outer cylindrical portion. The support portion extends in the axial direction. The support portion has a first support portion and a second support portion. The first support portion supports the outer peripheral edge of the first clutch plate or the second clutch plate. The second support portion supports the outer peripheral edge of the biasing member. The second support portion is lower in height than the first support portion.

[0014] The pulley device according to the second aspect of the present invention includes a fixed sheave, a fixed boss, a movable sheave, a movable boss, and any one of the above centrifugal clutches. The fixed boss extends axially from the fixed sheave. The movable sheave is movably disposed so as to approach and separate from the fixed sheave in the axial direction. The movable boss extends axially from the movable sheave. The movable boss is cylindrical. The movable boss is disposed outside the fixed boss in the radial direction. Torque from the fixed boss is input to the centrifugal clutch device.

Advantages of the Invention

[0015] According to the present invention, deformation of each clutch plate can be suppressed.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0017] Hereinafter, embodiments of a pulley device having a centrifugal clutch device will be described with reference to the drawings. In the following description, the axial direction means the direction in which the rotation axis of the centrifugal clutch device extends. The radial direction means the radial direction of a circle centered on the rotation axis O, and the circumferential direction means the circumferential direction of a circle centered on the rotation axis O.

[0018] [Pulley Device] The pulley device 100 is used, for example, as a driven pulley device constituting a CVT (Continuously Variable Transmission). Torque is transmitted to the pulley device 100 from a driving pulley device (not shown) via a belt 120. Then, the pulley device 100 transmits torque to a driving wheel (not shown) via a drive shaft (not shown).

[0019] The pulley device 100 includes a fixed sheave 101, a movable sheave 102, a fixed boss 103, a movable boss 104, and a centrifugal clutch device 10. The pulley device 100 rotates about the rotation axis O. Specifically, the pulley device 100 is attached to a drive shaft and is relatively rotatable with respect to the drive shaft.

[0020] [Fixed Sheave and Movable Sheave] The fixed sheave 101 and the movable sheave 102 approach and separate from each other in the axial direction. Specifically, the movable sheave 102 approaches and separates from the fixed sheave 101 by moving in the axial direction. The movable sheave 102 is biased toward the fixed sheave 101 by a biasing member 108, such as a coil spring. When the belt 120 moves radially inward, the movable sheave 102 moves away from the fixed sheave 101 against the biasing force of the biasing member 108.

[0021] The fixed sheave 101 and the movable sheave 102 have disc surfaces facing each other in the axial direction. The disc surfaces of the fixed sheave 101 and the movable sheave 102 are configured such that the distance between them increases toward the radially outer side. The belt 120 is sandwiched by the disc surfaces of the fixed sheave 101 and the movable sheave 102. An opening is provided at the central portion of the fixed sheave 101 and the movable sheave 102.

[0022] [Fixed boss] The fixed boss 103 extends axially from the fixed sheave 101 to the first side. The fixed boss 103 is cylindrical. The fixed boss 103 rotates integrally with the fixed sheave 101. The fixed sheave 101 and the fixed boss 103 are formed by separate members and are fixed to each other to rotate integrally. For example, the fixed sheave 101 and the fixed boss 103 are fixed to each other by welding or brazing. Note that the fixed sheave 101 and the fixed boss 103 may be formed of one member.

[0023] A drive shaft extends inside the fixed boss 103. The drive shaft is a shaft for transmitting torque to a drive wheel. The drive shaft and the fixed boss 103 are relatively rotatable. A needle bearing 105 and a ball bearing 106 are arranged between the drive shaft and the fixed boss 103.

[0024] [Movable boss] The movable boss 104 extends axially from the movable sheave 102 to the first side. The movable boss 104 is cylindrical. The movable boss 104 is disposed radially outside the fixed boss 103. That is, the fixed boss 103 extends inside the movable boss 104. The movable boss 104 slides axially on the outer peripheral surface of the fixed boss 103.

[0025] The movable boss 104 rotates integrally with the movable sheave 102. Further, the movable boss 104 moves axially integrally with the movable sheave 102. The movable boss 104 and the movable sheave 102 are formed by separate members and are fixed to each other so as to rotate integrally and move axially. For example, the movable boss 104 and the movable sheave 102 are fixed to each other by welding or brazing. Note that the movable boss 104 and the movable sheave 102 may be formed of one member. The movable boss 104 is cylindrical.

[0026] [Centrifugal clutch device] The centrifugal clutch device 10 is configured to transmit or cut off torque from the fixed boss 103 to the drive shaft. The centrifugal clutch device 10 is disposed axially on the first side of the fixed sheave 101 and the movable sheave 102. Note that the left side in FIG. 1 is the first side in the axial direction, and the right side in FIG. 1 is the second side in the axial direction. The centrifugal clutch device 10 is rotatable about the rotation axis O.

[0027] As shown in FIG. 2, the centrifugal clutch device 10 includes an input member 2, an output member 3, a plurality of first clutch plates 41, a plurality of second clutch plates 42, a plurality of centrifugal members 5, a cam mechanism 6, a biasing member 7, an outer cylindrical portion 8, and a plurality of support portions 80.

[0028] [Input member] The input member 2 is disposed rotatably around the rotation axis O. The input member 2 is attached to the tip portion 103a of the fixed boss 103. Torque from the fixed boss 103 is input to the input member 2, and the input member 2 rotates integrally with the fixed boss 103. Note that the fixed sheave 101 is attached to the base end portion 103b of the fixed boss 103.

[0029] Since the tip 103a of the fixed boss 103 has a smaller outer diameter than other parts, a stepped portion 103c is formed. This stepped portion 103c restricts the movement of the input member 2 in the second axial direction. Also, the input member 2 is fastened to the tip 103a of the fixed boss 103 by a nut or the like, and the movement of the input member 2 in the first axial direction is restricted. Thus, the input member 2 is immovable in the axial direction.

[0030] The input member 2 has a drive plate 21 and a support member 22. The drive plate 21 is attached to the fixed boss 103. Torque from the fixed boss 103 is input to the drive plate 21. The drive plate 21 is disk-shaped.

[0031] The support member 22 is configured to support each centrifuge 5. The support member 22 is annular. The support member 22 is disposed on the second side of the drive plate 21 in the axial direction. The support member 22 has a plurality of second column portions 221 extending toward the first side in the axial direction. The plurality of second column portions 221 are arranged at intervals in the circumferential direction. Each second column portion 221 is connected to each other by a cylindrical portion 222.

[0032] The second column portion 221 has a threaded hole that opens toward the first side in the axial direction. By screwing a bolt 110 into this threaded hole, the support member 22 is fixed to the drive plate 21. That is, the drive plate 21 and the support member 22 rotate integrally with each other.

[0033] The support member 22 has a plurality of accommodating portions 223 for accommodating the centrifuges 5. The plurality of accommodating portions 223 are arranged at intervals in the circumferential direction. This accommodating portion 223 is a recess formed in the support member 22 and opens toward the first side in the axial direction. That is, the accommodating portion 223 opens toward the biasing member 7. The accommodating portion 223 is defined by a cam surface 61, an inner wall surface of the restricting portion 224, and the like.

[0034] The support member 22 has a restricting portion 224. The restricting portion 224 is cylindrical and forms the outer wall of the support member 22. This restricting portion 224 is disposed radially outside the centrifuge 5. And the restricting portion 224 restricts the movement of the centrifuge 5 radially outward. Thus, by restricting the movement of the centrifuge 5 radially outward, the restricting portion 224 can prevent the transmission of excessive torque when excessive torque is input to the centrifugal clutch device 10. Note that, among the inner peripheral surfaces of the restricting portion 224, the portion Sub 5 that abuts against the centrifuge is planar.

[0035] [Outer cylindrical portion and support portion] The outer cylindrical portion 8 is cylindrical and extends in the axial direction. Specifically, the outer cylindrical portion 8 is cylindrical. The outer cylindrical portion 8 is disposed so as to cover the first and second clutch plates 41, 42 from the radially outside.

[0036] The outer cylindrical portion 8 is integrally formed with the input member 2. Specifically, the outer cylindrical portion 8 and the input member Material 2 and are formed of one member. The outer cylindrical portion 8 extends from the outer peripheral edge of the support member 22 to the first side in the axial direction.

[0037] As shown in FIG. 3, the support portion 80 projects radially inward from the inner peripheral surface of the outer cylindrical portion 8. The support portion 80 extends in the axial direction. The support portions 80 are arranged at intervals in the circumferential direction. The support portion 80 rotates integrally with the outer cylindrical portion 8. Note that the support portion 80 is formed of one member with the outer cylindrical portion 8. The support portion 80 has a first support portion 81 and a second support portion 82.

[0038] The first support portion 81 supports the outer peripheral edge of the first clutch plate 41. Specifically, the first support portion 81 supports the first clutch plate 41 in a non-rotatable manner. Also, the first support portion 81 supports the first clutch plate 41 so as to be axially movable.

[0039] The second support portion 82 supports the outer peripheral edge portion of the biasing member 7. Specifically, the second support portion 82 is in contact with the outer peripheral surface of the biasing member 7. The movement of the biasing member 7 in the first axial direction is restricted by the retaining ring 9. The second support portion 82 also supports the retaining ring 9. A part of the retaining ring 9 is accommodated in the groove 821 of the second support portion 82.

[0040] The height h2 of the second support portion 82 is lower than the height h1 of the first support portion 81. That is, the first support portion 81 protrudes radially inwardly more than the second support portion 82.

[0041] [Output member 3] As shown in FIG. 2, the output member 3 is disposed so as to be relatively rotatable with respect to the input member 2. The output member 3 is rotatable about the rotation axis O. The output member 3 outputs torque to the drive shaft. The output member 3 is disposed on the first side of the input member 2 in the axial direction. The output member 3 has a disk portion 31, a cylindrical portion 32, and a boss portion 33.

[0042] The disk portion 31 has a through hole at the center. The cylindrical portion 32 extends from the outer peripheral edge portion of the disk portion 31 to the second side in the axial direction. The cylindrical portion 32 is disposed radially inwardly of the outer cylindrical portion 8. The output member 3 has an outer diameter smaller than that of the input member 2.

[0043] The cylindrical portion 32 supports the second clutch plate 42. Specifically, the cylindrical portion 32 supports the inner peripheral edge portion of the second clutch plate 42. The second clutch plate 42 is axially slidable with respect to the cylindrical portion 32 and is attached non-rotatably.

[0044] The boss portion 33 extends from the inner peripheral edge portion of the disk portion 31 to the second side in the axial direction. The boss portion 33 extends inside the fixed boss 103. A spline hole 331 is formed in the boss portion 33. The drive shaft is spline-engaged with this spline hole 331.

[0045] [First and second clutch plates] As shown in Fig. 4, the first and second clutch plates 41 and 42 are configured to transmit and cut off torque between the input member 2 and the output member 3. The first and second clutch plates 41 and 42 constitute a multi-plate clutch. Note that this multi-plate clutch is a dry clutch.

[0046] The first clutch plate 41 and the second clutch plate 42 face each other in the axial direction. The first and second clutch plates 41 and 42 are arranged between the centrifugal member 5 and the biasing member 7 in the axial direction. The first clutch plate 41 and the second clutch plate 42 are alternately arranged in the axial direction.

[0047] The first clutch plate 41 is attached to the input member 2 so as to rotate integrally with the input member 2. Specifically, the first clutch plate 41 is attached to a first support portion 81 that rotates integrally with the input member 2. The outer peripheral edge portion of the first clutch plate 41 is engaged with the first support portion 81. The first clutch plate 41 is slidable in the axial direction.

[0048] As shown in Fig. 5, the first clutch plate 41 has a main body portion 41a and a plurality of tooth portions 41b. The main body portion 41a is annular. The tooth portions 41b project radially outward from the main body portion 41a. Each tooth portion 41b is arranged at intervals in the circumferential direction. By arranging the first support portion 81 between the adjacent tooth portions 41b, the first clutch plate 41 is supported by the first support portion 81.

[0049] As shown in Fig. 4, among the plurality of first clutch plates 41, the end first clutch plate arranged on the first side in the most axial direction 411 is in contact with the biasing member 7. Also, the end first clutch plate arranged on the second side in the most axial direction 412 is in contact with the centrifugal member 5.

[0050] The second clutch plate 42 is attached to the output member 3 so as to rotate integrally with the output member 3. Specifically, the second clutch plate 42 is attached to the cylindrical portion 32 of the output member 3. The inner peripheral edge portion of the second clutch plate 42 is engaged with the cylindrical portion 32. The second clutch plate 42 is slidable in the axial direction. The second clutch plate 42 has friction materials attached to both sides. Note that friction materials may be attached to both sides of the first clutch plate 41 instead of the second clutch plate 42.

[0051] As shown in FIG. 6, the second clutch plate 42 has a main body portion 42a and a plurality of tooth portions 42b. The main body portion 42a is annular. The tooth portions 42b project radially inward from the main body portion 42a. Each tooth portion 42b is arranged at intervals in the circumferential direction. A part of the cylindrical portion 32 is arranged between the adjacent tooth portions 42b, whereby the second clutch plate 42 is supported by the cylindrical portion 32.

[0052] As shown in FIG. 4, the first clutch plate 41 and the second clutch plate 42 are in contact with each other. Specifically, the first clutch plate 41 is in contact with the friction material of the second clutch plate 42. The portion where the first clutch plate 41 and the second clutch plate 42 are in contact is referred to as the contact surface 43 between the first clutch plate 41 and the second clutch plate 42.

[0053] As shown in FIG. 7, the contact surface 43 is annular and extends in the circumferential direction. In this embodiment, the overlapping portion of the main body portion 41a of the first clutch plate 41 and the main body portion 42a of the second clutch plate 42 becomes the contact surface 43. The main body portion 41a of the first clutch plate 41 and the main body portion 42a of the second clutch plate 42 are in overall contact with each other. The contact surface 43 may extend continuously or intermittently.

[0054] The contact surface 43 has an outer peripheral portion and an inner peripheral portion. The outer peripheral portion of the contact surface 43 means the region from the outer peripheral edge of the contact surface 43 to the central circle C of the contact surface 43. Note that the outer peripheral portion of the contact surface 43 includes the central circle C. The central circle C of the contact surface 43 means a circle extending at the center between the outer peripheral edge and the inner peripheral edge of the contact surface 43. That is, the radius r of the central circle C can be obtained by r = (r1 + r2) / 2. Note that r1 means the radius of the outer peripheral edge of the contact surface 43, and r2 means the radius of the inner peripheral edge of the contact surface 43. Also, the central circle C means the circumference.

[0055] [Centrifugal member 5] As shown in FIG. 4, the centrifugal member 5 is arranged to rotate together with the input member 2 and receive centrifugal force. Specifically, the centrifugal member 5 is housed in the housing portion 223 of the input member 2. Note that a plurality of centrifugal members 5 are arranged at intervals in the circumferential direction.

[0056] The centrifugal member 5 is cylindrical. The centrifugal member 5 is arranged such that its outer peripheral surface abuts against the cam surface 61. For this reason, when centrifugal force acts on the centrifugal member 5, it can move radially outward and to the first side in the axial direction. The centrifugal member 5 is configured to press the first and second clutch plates 41, 42 to the first side in the axial direction. When excessive torque is input, the centrifugal member 5 moves radially outward and abuts against the restricting portion 224. When the centrifugal member 5 abuts against the restricting portion 224 in this way, no further pressing force is applied to the first and second clutch plates 41, 42. Note that the portion of the restricting portion 224 that abuts against the centrifugal member 5 is planar.

[0057] The centrifugal member 5 is arranged at the initial position when the centrifugal clutch device 10 stops, and moves to the operating position when the centrifugal clutch device 10 operates. Note that the operating position is located radially outside the initial position.

[0058] As shown in FIG. 8, when the rotor 5 is in the initial position, the center O2 of the rotor 5 is arranged radially inside the center circle C of the contact surface 43. When the rotor 5 is in contact with the first clutch plate 41 when the rotor 5 is in the initial position, the contact portion between the rotor 5 and the first clutch plate 41 is arranged radially inside the center circle C of the contact surface 43.

[0059] On the other hand, as shown in FIG. 9, when the rotor 5 is in the operating position, the rotor 5 abuts against the first clutch plate 41 radially outside the center circle C of the contact surface 43. When the rotor 5 is in the operating position, the center O2 of the rotor 5 is arranged radially outside the center circle C of the contact surface 43.

[0060] [Cam mechanism] As shown in FIG. 4, the cam mechanism 6 is configured to convert the centrifugal force of the rotor 5 into a thrust force of the rotor 5 toward the biasing member 7. Specifically, the cam mechanism 6 has a plurality of cam surfaces 61. Each cam surface 61 is formed on the input member 2. The cam surfaces 61 are arranged at intervals in the circumferential direction. The cam surface 61 faces the biasing member 7 and is inclined so as to face radially inward.

[0061] [Biasing member] The biasing member 7 is arranged at an axial interval from the rotor 5. The first and second clutch plates 41 and 42 are arranged between the biasing member 7 and the rotor 5. The biasing member 7 biases the first and second clutch plates 41 and 42 axially toward the rotor 5.

[0062] The biasing member 7 has an outer peripheral edge portion 71 and an inner peripheral edge portion 72. Specifically, the biasing member 7 is a disc spring. The outer peripheral edge portion 71 of the biasing member 7 is supported by the second support portion 82. The inner peripheral edge portion 72 of the biasing member 7 is in contact with the end portion of the first clutch plate 411 and is in contact. The biasing member 7 is in contact with the first clutch plate 41 at the outer peripheral portion of the contact surface 43. Specifically, the biasing member 7 is in contact with the first clutch plate 41 at the center circle C of the contact surface 43 or radially outside the center circle C.

[0063] The outer peripheral edge of the biasing member 7 is disposed radially outward of the outer peripheral edges of the main body portions 41a, 42a of the first and second clutch plates 41, 42. That is, the outer diameter of the biasing member 7 is larger than the outer diameters of the main body portions 41a, 42a of the first and second clutch plates 41, 42.

[0064] In addition, the inner peripheral edge of the biasing member 7 is disposed radially outward of the inner peripheral edges of the main body portions 41a, 42a of the first and second clutch plates 41, 42. That is, the inner diameter of the biasing member 7 is larger than the inner diameters of the main body portions 41a, 42a of the first and second clutch plates 41, 42. In addition, the inner diameter of the biasing member 7 is smaller than the outer diameters of the main body portions 41a, 42a of the first and second clutch plates 41, 42.

[0065] [Operation of the Centrifugal Clutch Device 10] Next, the operation of the centrifugal clutch device 10 will be described. First, at the time of stoppage, the centrifugal clutch device 10 is in a clutch-off state. That is, the centrifugal clutch device 10 does not transmit torque between the fixed boss 103 and the drive shaft. Specifically, in the first and second clutch plates 41, 42 of the centrifugal clutch device 10, the transmission of torque is blocked. For this reason, the motorcycle can be easily pushed and moved. At this time of stoppage, the centrifugal member 5 is disposed at the initial position. The center O2 of the centrifugal member 5 is located radially inward of the center circle C of the contact surface 43.

[0066] When starting, torque is input from the fixed boss 103 to the input member 2, and the input member 2 rotates. When the input member 2 rotates, the centrifugal member 5 that rotates together with the input member 2 moves radially outward by centrifugal force. That is, the centrifugal member 5 moves to the operating position when the centrifugal clutch device 10 is in operation.

[0067] Here, the centrifugal member 5 moves radially outward along the cam surface 61, thereby moving to the first side in the axial direction and pressing the first and second clutch plates 41 and 42. As a result, the first and second clutch plates 41 and 42 are in the clutch-on state. At this time, the centrifugal member 5 contacts the first clutch plate 41 on the radially outer side of the center circle C of the contact surface 43.

[0068] [Modification Example] As described above, the embodiments of the present invention have been described. However, the present invention is not limited to these, and various modifications are possible without departing from the spirit of the present invention.

[0069] Modification Example 1 In the above embodiment, the first clutch plate 41 is arranged at both ends in the axial direction. However, the second clutch plate 42 may be arranged at both ends in the axial direction. In this case, the centrifugal member 5 and the biasing member 7 contact the second clutch plate 42.

[0070] Modification Example 2 In the above embodiment, the outer cylindrical portion 8 is integrally formed with the input member 2. However, the configuration of the outer cylindrical portion 8 is not limited to this. For example, the outer cylindrical portion 8 may be integrally formed with the output member 3. Specifically, the outer cylindrical portion 8 may be formed by one member with the output member 3. In this case, the support portion 80 is configured to support the outer peripheral edge portion of the second clutch plate 42 instead of the outer peripheral edge portion of the first clutch plate 41. Further, the input member 2 has a cylindrical portion extending in the axial direction inside the outer cylindrical portion 8 in the radial direction. The inner peripheral edge portion of the first clutch plate 41 is supported by the cylindrical portion of the input member 2.

[0071] Modification Example 3 In the above embodiment, a disc spring is exemplified as an example of the biasing member 7. However, the biasing member 7 may be other than a disc spring. For example, a coil spring may be used as the biasing member 7.

[0072] Modification Example 4 In the above-described embodiment, the centrifugal clutch device 10 is used as a component of the pulley device 100. However, the configuration of the centrifugal clutch device 10 is not limited thereto. The centrifugal clutch device 10 may be attached to other devices.

Explanation of Reference Numerals

[0073] 100 Pulley device 10 Centrifugal clutch device 2 Input member 3 Output member 41 First clutch plate 42 Second clutch plate 43 Contact surface 5 Centrifugal weight 6 Cam mechanism 7 Biasing member 8 Outer cylindrical portion 80 Support portion 81 First support portion 82 Second support portion

Claims

1. An input member rotatably disposed; An output member rotatably disposed relative to the input member; A centrifugal member that rotates with the input member and receives centrifugal force; A biasing member disposed at an axial interval from the centrifugal member; A first clutch plate disposed between the centrifugal member and the biasing member and rotating integrally with the input member; A second clutch plate disposed between the centrifugal member and the biasing member so as to face the first clutch plate and rotating integrally with the output member; A cam mechanism configured to convert the centrifugal force of the centrifugal member into a thrust force of the centrifugal member toward the biasing member; An outer cylindrical portion disposed so as to cover the first clutch plate and the second clutch plate and configured integrally with the input member; A centrifugal clutch device comprising: The biasing member abuts on the first clutch plate or the second clutch plate in an outer peripheral portion which is a region from the center circle to the outer peripheral end of the contact surface between the first clutch plate and the second clutch plate; The biasing member is a disc spring; An inner peripheral edge portion of the biasing member abuts on the first clutch plate or the second clutch plate; The centrifugal member is disposed at an initial position when the centrifugal clutch device stops, and is configured to move to an operating position radially outside the initial position when the centrifugal clutch device operates; When the centrifugal member is at the initial position, the center of the centrifugal member is disposed radially inward of the center of the contact surface; When the centrifugal member is at the operating position, the centrifugal member abuts on the first clutch plate or the second clutch plate radially outside the center of the contact surface; The second clutch plate does not have a through hole penetrating in the axial direction; A centrifugal clutch device.

2. When the centrifugal member is at the operating position, the center of the centrifugal member is disposed radially outside the inner peripheral edge portion of the biasing member; The centrifugal clutch device according to Claim 1.

3. Further comprising a support portion protruding radially inward from the inner peripheral surface of the outer cylindrical portion and extending in the axial direction, The support portion is A first support portion that supports an outer peripheral edge portion of the first clutch plate or the second clutch plate; A second support portion that supports an outer peripheral edge portion of the biasing member and has a lower height than the first support portion; Having The centrifugal clutch device according to Claim 1 or 2.

4. A fixed sheave, A fixed boss extending axially from the fixed sheave, A movable sheave movably arranged so as to approach and separate from the fixed sheave in the axial direction, A cylindrical movable boss extending axially from the movable sheave and arranged outside the fixed boss in the radial direction, A centrifugal clutch device according to any one of claims 1 to 3, to which torque is input from the fixed boss, A pulley device comprising the same.

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