JP7698405B2 - Centrifugal clutch device and pulley device - Google Patents

Description

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

The centrifugal clutch device is configured to transmit torque from the engine to the drive wheels when the engine speed exceeds a predetermined value. Such centrifugal clutch devices are primarily used in scooter-type motorcycles.

For example, the centrifugal clutch device disclosed in Patent Document 1 has multiple clutch plates arranged between a centrifugal element and a disc spring. When the centrifugal clutch device rotates, centrifugal force acts on the centrifugal element, causing the centrifugal element to move radially outward along the cam surface and toward the disc spring. As a result, the centrifugal element and the disc spring sandwich the multiple clutch plates, transmitting torque.

Patent No. 3993170

In the centrifugal clutch device described above, the coned disc spring biases the clutch plate radially inward, while the centrifugal element presses the clutch plate radially outward. The load acting on the clutch plate may cause the clutch plate to deform, resulting in a problem of reduced torque transmission through the clutch plate.

Therefore, the objective of this invention is to suppress deformation of each clutch plate.

The centrifugal clutch device according to the first aspect of the present invention comprises an input member, an output member, a centrifugal element, 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 rotatably arranged relative to the input member. The centrifugal element rotates together with the input member and receives centrifugal force. The biasing member is arranged at a distance from the centrifugal element in the axial direction. The first clutch plate is arranged between the centrifugal element and the biasing member, and the first clutch plate rotates integrally with the input member. The second clutch plate is arranged between the centrifugal element 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 element into a thrust force that the centrifugal element moves toward the biasing member. The biasing member abuts against the first clutch plate or the second clutch plate at the outer periphery of the contact surface between the first clutch plate and the second clutch plate.

With this configuration, the biasing member biases the first clutch plate or the second clutch plate radially outward, thereby preventing the first and second clutch plates from being deformed by the load acting on them.

Preferably, the centrifugal element is configured to be disposed in an initial position when the centrifugal clutch device is stopped, and to move to an operating position when the centrifugal clutch device is operated. The operating position is radially outward from the initial position.

Preferably, when the centrifugal element is in the initial position, the center of the centrifugal element is located radially inward from the center of the contact surface.

Preferably, when the centrifugal element is in the operating position, the centrifugal element abuts against the first clutch plate or the second clutch plate radially outward from the center of the contact surface.

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.

Preferably, the centrifugal clutch device further includes an outer cylindrical portion and a support portion. The outer cylindrical portion is arranged to cover the first clutch plate and the second clutch plate. The support portion protrudes 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 portion of the first clutch plate or the second clutch plate. The second support portion supports the outer peripheral edge portion of the biasing member. The second support portion is lower in height than the first support portion.

The pulley device according to the second aspect of the present invention comprises a fixed sheave, a fixed boss, a movable sheave, a movable boss, and any one of the centrifugal clutches described above. The fixed boss extends in the axial direction from the fixed sheave. The movable sheave is arranged so as to be movable toward and away from the fixed sheave in the axial direction. The movable boss extends in the axial direction from the movable sheave. The movable boss is cylindrical. The movable boss is arranged radially outward of the fixed boss. The centrifugal clutch device receives torque from the fixed boss.

The present invention makes it possible to suppress deformation of each clutch plate.

FIG. FIG. FIG. FIG. FIG. FIG. FIG. FIG. 4 is a cross-sectional view of the centrifugal clutch device when the centrifugal element is in an initial position. FIG. 4 is a cross-sectional view of the centrifugal clutch device when the centrifugal element is in an operating position.

Below, an embodiment 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 shaft of the centrifugal clutch device extends. Furthermore, the radial direction means the radial direction of a circle centered on the rotation shaft O, and the circumferential direction means the circumferential direction of a circle centered on the rotation shaft O.

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

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 a rotation axis O. In detail, the pulley device 100 is attached to a drive shaft and can rotate relative to the drive shaft.

[Fixed sheave and movable sheave]
The fixed sheave 101 and the movable sheave 102 move toward and away from each other in the axial direction. More specifically, the movable sheave 102 moves toward and away from the fixed sheave 101 as the movable sheave 102 moves in the axial direction. The movable sheave 102 is biased toward the fixed sheave 101 by a biasing member 108, for example, a coil spring. As the belt 120 moves inward in the radial direction, the movable sheave 102 moves away from the fixed sheave 101 against the biasing force of the biasing member 108.

The fixed sheave 101 and the movable sheave 102 have disk surfaces that face each other in the axial direction. The disk surfaces of the fixed sheave 101 and the movable sheave 102 are configured so that the distance between them increases toward the outside in the radial direction. The belt 120 is sandwiched between the disk surfaces of the fixed sheave 101 and the movable sheave 102. An opening is provided in the center of the fixed sheave 101 and the movable sheave 102.

[Fixed boss]
The fixed boss 103 extends from the fixed sheave 101 to a first side in the axial direction. 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 each formed of 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. The fixed sheave 101 and the fixed boss 103 may be formed of a single member.

A drive shaft extends inside the fixed boss 103. The drive shaft is a shaft for transmitting torque to the drive wheels. The drive shaft and the fixed boss 103 can rotate relative to each other. A needle bearing 105 and a ball bearing 106 are disposed between the drive shaft and the fixed boss 103.

[Movable boss]
The movable boss 104 extends from the movable sheave 102 to a first side in the axial direction. The movable boss 104 is cylindrical. The movable boss 104 is disposed outside the fixed boss 103 in the radial direction. In other words, the fixed boss 103 extends inside the movable boss 104. The movable boss 104 slides on the outer circumferential surface of the fixed boss 103 in the axial direction.

The movable boss 104 rotates integrally with the movable sheave 102. The movable boss 104 also moves axially integrally with the movable sheave 102. The movable boss 104 and the movable sheave 102 are each formed from separate members, and are fixed to each other so that they rotate and move axially integrally. For example, the movable boss 104 and the movable sheave 102 are fixed to each other by welding or brazing. The movable boss 104 and the movable sheave 102 may be formed from a single member. The movable boss 104 is cylindrical.

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

As shown in FIG. 2, the centrifugal clutch device 10 has 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 elements 5, a cam mechanism 6, a biasing member 7, an outer cylindrical portion 8, and a plurality of support portions 80.

[Input member]
The input member 2 is disposed so as to be rotatable around a rotation axis O. The input member 2 is attached to a tip end 103a of a fixed boss 103. The input member 2 receives torque from the fixed boss 103 and rotates integrally with the fixed boss 103. A fixed sheave 101 is attached to a base end 103b of the fixed boss 103.

The tip 103a of the fixed boss 103 has a smaller outer diameter than the other parts, forming a step 103c. This step 103c restricts the movement of the input member 2 toward the second side in the axial direction. The input member 2 is also fastened to the tip 103a of the fixed boss 103 by a nut or the like, restricting the movement of the input member 2 toward the first side in the axial direction. In this way, the input member 2 cannot move in the axial direction.

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 is input to the drive plate 21 from the fixed boss 103. The drive plate 21 is disk-shaped.

The support member 22 is configured to support each centrifugal element 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 pillar portions 221 extending to the first side in the axial direction. The plurality of second pillar portions 221 are disposed at intervals in the circumferential direction. The second pillar portions 221 are connected to each other by cylindrical portions 222.

The second column portion 221 has a screw hole that opens to the first axial side. The support member 22 is fixed to the drive plate 21 by screwing the bolt 110 into this screw hole. In other words, the drive plate 21 and the support member 22 rotate integrally with each other.

The support member 22 has a plurality of accommodating portions 223 for accommodating the centrifugal elements 5. The plurality of accommodating portions 223 are arranged at intervals in the circumferential direction. The accommodating portions 223 are recesses formed in the support member 22 and open toward the first side in the axial direction. In other words, the accommodating portions 223 open toward the biasing member 7. The accommodating portions 223 are defined by the cam surface 61, the inner wall surface of the restricting portion 224, and the like.

The support member 22 has a restricting portion 224. The restricting portion 224 is cylindrical and constitutes the outer wall of the support member 22. The restricting portion 224 is disposed radially outward of the centrifugal element 5. The restricting portion 224 restricts the radially outward movement of the centrifugal element 5. In this manner, by restricting the radially outward movement of the centrifugal element 5, when excessive torque is input to the centrifugal clutch device 10, the restricting portion 224 can prevent the transmission of the excessive torque. Note that the portion of the inner circumferential surface of the restricting portion 224 that abuts against the centrifugal element 5 is flat.

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

The outer cylindrical portion 8 is configured integrally with the input member 2. In detail, the outer cylindrical portion 8 and the input member 2 are configured by a single member. The outer cylindrical portion 8 extends from the outer peripheral edge portion of the support member 22 to a first side in the axial direction.

As shown in FIG. 3, the support portion 80 protrudes 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 spaced apart from one another in the circumferential direction. The support portions 80 rotate integrally with the outer cylindrical portion 8. The support portion 80 and the outer cylindrical portion 8 are formed of a single member. The support portion 80 has a first support portion 81 and a second support portion 82.

The first support portion 81 supports the outer peripheral edge portion of the first clutch plate 41. More specifically, the first support portion 81 supports the first clutch plate 41 so that it cannot rotate. The first support portion 81 also supports the first clutch plate 41 so that it can move in the axial direction.

The second support part 82 supports the outer peripheral edge of the biasing member 7. More specifically, the second support part 82 abuts against the outer peripheral surface of the biasing member 7. The biasing member 7 is restricted from moving axially toward the first side by a retaining ring 9. The second support part 82 also supports the retaining ring 9. A portion of the retaining ring 9 is housed in a groove 821 of the second support part 82.

The height h2 of the second support portion 82 is lower than the height h1 of the first support portion 81. In other words, the first support portion 81 protrudes radially inward more than the second support portion 82.

[Output member 3]
As shown in Fig. 2, the output member 3 is disposed so as to be rotatable relative to the input member 2. The output member 3 is rotatable around a rotation axis O. The output member 3 outputs torque to the drive shaft. The output member 3 is disposed on a 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.

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

The cylindrical portion 32 supports the second clutch plate 42. More specifically, the cylindrical portion 32 supports the inner peripheral edge of the second clutch plate 42. The second clutch plate 42 is attached to the cylindrical portion 32 so as to be axially slidable but non-rotatable.

The boss portion 33 extends from the inner peripheral edge of the disk portion 31 toward 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.

[First and second clutch plates]
As shown in Fig. 4, the first and second clutch plates 41, 42 are configured to transmit and interrupt torque between the input member 2 and the output member 3. The first and second clutch plates 41, 42 configure a multi-plate clutch. This multi-plate clutch is a dry clutch.

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, 42 are arranged between the centrifugal element 5 and the biasing member 7 in the axial direction. The first clutch plate 41 and the second clutch plate 42 are arranged alternately in the axial direction.

The first clutch plate 41 is attached to the input member 2 so as to rotate integrally with the input member 2. In detail, the first clutch plate 41 is attached to a first support portion 81 which 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.

As shown in FIG. 5, the first clutch plate 41 has a main body portion 41a and a plurality of teeth portions 41b. The main body portion 41a is annular. The teeth portions 41b protrude radially outward from the main body portion 41a. The teeth portions 41b are arranged at intervals in the circumferential direction. The first support portion 81 is arranged between the adjacent teeth portions 41b, so that the first clutch plate 41 is supported by the first support portion 81.

4, of the multiple first clutch plates 41, the end first clutch plate 411 arranged closest to the first side in the axial direction abuts against the biasing member 7. Moreover, the end first clutch plate 412 arranged closest to the second side in the axial direction abuts against the centrifugal element 5.

The second clutch plate 42 is attached to the output member 3 so as to rotate integrally with the output member 3. In detail, 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 engages with the cylindrical portion 32. The second clutch plate 42 is slidable in the axial direction. The second clutch plate 42 has friction material attached to both sides. Note that the friction material may be attached to both sides of the first clutch plate 41 instead of the second clutch plate 42.

As shown in FIG. 6, the second clutch plate 42 has a main body portion 42a and a plurality of teeth portions 42b. The main body portion 42a is annular. The teeth portions 42b protrude radially inward from the main body portion 42a. The teeth portions 42b are arranged at intervals in the circumferential direction. The second clutch plate 42 is supported by the cylindrical portion 32 by disposing a portion of the cylindrical portion 32 between the adjacent teeth portions 42b.

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 called the contact surface 43 between the first clutch plate 41 and the second clutch plate 42.

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

The contact surface 43 has an outer periphery and an inner periphery. The outer periphery of the contact surface 43 means the area from the outer periphery of the contact surface 43 to the central circle C of the contact surface 43. The outer periphery of the contact surface 43 also includes the central circle C. The central circle C of the contact surface 43 means a circle extending in the middle between the outer periphery and the inner periphery of the contact surface 43. In other words, the radius r of the central circle C can be calculated by r = (r1 + r2) / 2. Here, r1 means the radius of the outer periphery of the contact surface 43, and r2 means the radius of the inner periphery of the contact surface 43. The central circle C means the circumference.

[Centrifugal element 5]
4, the centrifugal element 5 is disposed so as to rotate together with the input member 2 and receive centrifugal force. More specifically, the centrifugal element 5 is housed in the housing portion 223 of the input member 2. The multiple centrifugal elements 5 are disposed at intervals in the circumferential direction.

The centrifugal element 5 is cylindrical. The centrifugal element 5 is arranged so that its outer circumferential surface abuts against the cam surface 61. Therefore, when centrifugal force acts on the centrifugal element 5, it can move radially outward and toward the first axial side. The centrifugal element 5 is configured to press the first and second clutch plates 41, 42 toward the first axial side. When excessive torque is input, the centrifugal element 5 moves radially outward and abuts against the regulating portion 224. When the centrifugal element 5 abuts against the regulating portion 224 in this way, no further pressing force is applied to the first and second clutch plates 41, 42. The portion of the regulating portion 224 that abuts against the centrifugal element 5 is flat.

The centrifugal element 5 is disposed in an initial position when the centrifugal clutch device 10 is stopped, and moves to an operating position when the centrifugal clutch device 10 is operating. The operating position is located radially outward from the initial position.

As shown in FIG. 8, when the centrifugal element 5 is in the initial position, the center O2 of the centrifugal element 5 is located radially inward from the center circle C of the contact surface 43. When the centrifugal element 5 is in contact with the first clutch plate 41 while in the initial position, the contact portion between the centrifugal element 5 and the first clutch plate 41 is located radially inward from the center circle C of the contact surface 43.

On the other hand, as shown in FIG. 9, when the centrifugal element 5 is in the operating position, the centrifugal element 5 abuts against the first clutch plate 41 radially outward from the center circle C of the contact surface 43. Also, when the centrifugal element 5 is in the operating position, the center O2 of the centrifugal element 5 is located radially outward from the center circle C of the contact surface 43.

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

[Using member]
The biasing member 7 is disposed at a distance from the centrifugal element 5 in the axial direction. The first and second clutch plates 41, 42 are disposed between the biasing member 7 and the centrifugal element 5. The biasing member 7 biases the first and second clutch plates 41, 42 in the axial direction toward the centrifugal element 5.

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 abuts against the end first clutch plate 411. The biasing member 7 abuts against the first clutch plate 41 at the outer periphery of the contact surface 43. Specifically, the biasing member 7 abuts against the first clutch plate 41 at the center circle C of the contact surface 43 or radially outward from the center circle C.

The outer peripheral edge of the biasing member 7 is disposed radially outward from the outer peripheral edges of the main body portions 41a, 42a of the first and second clutch plates 41, 42. In other words, the outer diameter of the biasing member 7 is larger than the outer diameter of the main body portions 41a, 42a of the first and second clutch plates 41, 42.

The inner peripheral edge of the biasing member 7 is disposed radially outward from the inner peripheral edges of the main body portions 41a, 42a of the first and second clutch plates 41, 42. In other words, the inner diameter of the biasing member 7 is larger than the inner diameter of the main body portions 41a, 42a of the first and second clutch plates 41, 42. The inner diameter of the biasing member 7 is smaller than the outer diameter of the main body portions 41a, 42a of the first and second clutch plates 41, 42.

[Operation of the centrifugal clutch device 10]
Next, the operation of the centrifugal clutch device 10 will be described. First, when stopped, 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. More specifically, the transmission of torque is blocked at the first and second clutch plates 41, 42 of the centrifugal clutch device 10. This allows the motorcycle to be easily pushed and moved. Note that when stopped, the centrifugal element 5 is located in the initial position. The center O2 of the centrifugal element 5 is located radially inward of the central circle C of the contact surface 43.

When starting, torque is input from the fixed boss 103 to the input member 2, causing the input member 2 to rotate. When the input member 2 rotates, the centrifugal element 5, which rotates together with the input member 2, moves radially outward due to centrifugal force. In other words, the centrifugal element 5 moves to the operating position when the centrifugal clutch device 10 is activated.

The centrifugal element 5 moves radially outward along the cam surface 61, thereby moving toward the first axial side and pressing against the first and second clutch plates 41, 42. As a result, the first and second clutch plates 41, 42 are in a clutch-on state. Note that the centrifugal element 5 at this time abuts against the first clutch plate 41 radially outward of the center circle C of the contact surface 43.

[Modification]
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.

Variation 1
In the above embodiment, the first clutch plates 41 are disposed at both ends in the axial direction, but the second clutch plates 42 may be disposed at both ends in the axial direction. In this case, the centrifugal element 5 and the biasing member 7 come into contact with the second clutch plates 42.

Variation 2
In the above embodiment, the outer cylindrical portion 8 is configured integrally with the input member 2, but the configuration of the outer cylindrical portion 8 is not limited thereto. For example, the outer cylindrical portion 8 may be configured integrally with the output member 3. In particular, the outer cylindrical portion 8 may be configured as one member together 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, not the outer peripheral edge portion of the first clutch plate 41. In addition, the input member 2 has a cylindrical portion extending in the axial direction radially inside the outer cylindrical portion 8. The cylindrical portion of the input member 2 supports the inner peripheral edge portion of the first clutch plate 41.

Variation 3
In the above embodiment, the disc spring is exemplified as an example of the biasing member 7, but the biasing member 7 may be a member other than the disc spring. For example, a coil spring may be used as the biasing member 7.

Variation 4
In the above embodiment, the centrifugal clutch device 10 is used as a component part of the pulley device 100, but the configuration of the centrifugal clutch device 10 is not limited to this. The centrifugal clutch device 10 may be attached to another device.

REFERENCE SIGNS LIST 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 element 6 Cam mechanism 7 Urging member 8 Outer cylindrical portion 80 Support portion 81 First support portion 82 Second support portion

Claims (4)

An input member that is rotatably disposed;
an output member arranged to be rotatable relative to the input member;
a centrifugal element that rotates together with the input member and receives centrifugal force;
a biasing member disposed at an axial distance from the centrifugal element;
a first clutch plate disposed between the centrifugal element and the biasing member and rotating integrally with the input member;
a second clutch plate disposed between the centrifugal element and the biasing member so as to face the first clutch plate and rotate integrally with the output member;
a cam mechanism configured to convert the centrifugal force of the centrifugal element into a thrust force of the centrifugal element toward the biasing member;
an outer cylindrical portion that is disposed so as to cover the first clutch plate and the second clutch plate and is integral with the input member;
A centrifugal clutch device comprising:
the biasing member abuts against the first clutch plate or the second clutch plate at an outer periphery, which is a region from a center circle to an outer periphery of a 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 against the first clutch plate or the second clutch plate,
The centrifugal element is configured to be disposed at an initial position when the centrifugal clutch device is stopped, and to move to an operating position that is radially outward from the initial position when the centrifugal clutch device is operated,
When the centrifugal element is in the initial position, a center of the centrifugal element is disposed radially inward from a center of the contact surface,
When the centrifugal element is in the operating position, the centrifugal element abuts against the first clutch plate or the second clutch plate at a position radially outward from a center of the contact surface,
The second clutch plate does not have a through hole passing through in the axial direction.
Centrifugal clutch device.
When the centrifugal element is in the operating position, a center of the centrifugal element is disposed radially outward from an inner peripheral edge of the biasing member.
2. The centrifugal clutch device according to claim 1.
The bearing further includes a support portion that protrudes radially inward from an inner circumferential surface of the outer cylindrical portion and extends in an 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 height lower than that of the first support portion;
having
3. A centrifugal clutch device according to claim 1 or 2.
A fixed sheave;
A fixed boss extending axially from the fixed sheave;
a movable sheave that is movably arranged so as to approach and move away from the fixed sheave in the axial direction;
a cylindrical movable boss extending in an axial direction from the movable sheave and disposed radially outward of the fixed boss;
A centrifugal clutch device according to any one of claims 1 to 3 , in which torque is input from the fixed boss;
A pulley device comprising:

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