WO2011049109A1

WO2011049109A1 - Clutch device for motorcycle

Info

Publication number: WO2011049109A1
Application number: PCT/JP2010/068446
Authority: WO
Inventors: 郊二梶谷; 昌弘米田; 哲也久保田; 慎司二川
Original assignee: 株式会社エクセディ
Priority date: 2009-10-21
Filing date: 2010-10-20
Publication date: 2011-04-28
Also published as: JP2011089556A

Abstract

Disclosed is a motorcycle clutch device provided with a back-torque limiter, such that the restriction value of back torque can be easily changed with a structure produced at a low cost. The clutch device is provided with a clutch housing (1) to which torque from an engine is input, an output-side rotator (2) coupled to a transmission-side input shaft, a clutch unit (3) having one or more plate members for transmitting and blocking torque between the clutch housing (1) and the output-side rotator (2), a first pressure plate (4) for pressing the plate members of the clutch unit (3), a spring (5) for pressing the first pressure plate (4) by a predetermined pressing force, and a back-torque limiter mechanism (6). The back-torque limiter mechanism (6) is detachably supported by the output-side rotator (2), and restricts a transmission torque value of the clutch unit (3) to or below a predetermined value when the back torque occurs.

Description

Clutch device for motorcycle

The present invention relates to a two-wheeled clutch device, and more particularly to a two-wheeled clutch device that transmits torque from an engine to an output side member and interrupts torque transmission by operating a release mechanism.

Generally, in a two-wheeled vehicle that performs manual transmission, a multi-plate clutch device is used to transmit or cut off power from an engine to a transmission. The multi-plate clutch device includes a clutch housing coupled to the crankshaft side of the engine, an output-side rotating body coupled to the transmission side, a clutch unit for transmitting and shutting power between them, and a clutch And a pressure plate for pressing the part. In the clutch portion, first clutch plates and second clutch plates are alternately arranged. The first clutch plate is engaged with the clutch housing, and the second clutch plate is engaged with the output side rotating body.

Then, the torque of the crankshaft is transmitted to the transmission side via the clutch portion by pressing the first and second clutch plates with a pressing member such as a spring via the pressure plate. Further, when the rider grasps the clutch lever, the release mechanism is activated, and the release plate presses the pressure plate against the clutch plate. As a result, the pressure contact between the first clutch plate and the second clutch plate is released, and torque transmission between both clutch plates is interrupted.

Here, in the two-wheeled vehicle clutch device, the rotation on the output side may exceed the rotation on the input side, so-called back torque may occur. Thus, there is a case where a back torque limiter mechanism is provided that regulates the transmitted back torque by separating both clutch plates when a back torque is generated (for example, Patent Document 1).

JP 2007-205387 A

In the back torque limiter mechanism disclosed in Patent Document 1, a separate member having a cam surface is fixed to a clutch member that is a rotating body on the output side. When the back torque is applied, the first and second clutch plates are separated using the cam surface of the separate member.

Here, even in a clutch device used for racing, it is effective to provide a back torque limiter mechanism in order to suppress excessive engine braking due to back torque. In this case, it is desirable to be able to change the regulation value of the back torque in various ways according to the race course situation.

In response to such a request, in the clutch device having the conventional back torque limiter mechanism as shown in Patent Document 1, the output side rotating body must be replaced to change the back torque regulation value. Don't be. For this reason, cost becomes expensive and the operation | work for changing the regulation value of back torque is complicated. Furthermore, in the conventional back torque limiter mechanism, a large number of cam surfaces cannot be formed because of space. For this reason, there is a problem that the surface pressure of the cam surface is increased and the cam surface is easily worn.

An object of the present invention is to make it possible to change the regulation value of the back torque with an inexpensive configuration in a clutch device for a motorcycle having a back torque limiter mechanism. And it is to make the work for the change easy.

Another object of the present invention is to extend the life of the back torque limiter mechanism.

A clutch device for a motorcycle according to a first aspect of the present invention is a clutch device that transmits torque from an engine to an output side member and interrupts torque transmission by operation of a release mechanism, and receives a torque from the engine. An output-side rotating body coupled to the output-side member, a clutch portion having one or more plate members for transmitting and interrupting torque between the clutch housing and the output-side rotating body, A pressure plate for pressing the plate member, a pressing member for pressing the pressure plate with a predetermined pressing force, and a back torque limiter mechanism are provided. The back torque limiter mechanism is a mechanism that is detachably supported by the output-side rotator and regulates the transmission torque value of the clutch portion to a predetermined value or less when back torque is generated.

In this clutch device, the pressing force by the pressing member acts on the clutch portion via the pressure plate, and the clutch is on (torque transmission state). In this state, power from the input side member is input to the clutch housing, further transmitted to the output side rotating body via the clutch portion, and output to the output side member such as the input shaft of the transmission. When the clutch is turned off (torque transmission is interrupted), when the pressing member is operated by the release member, the pressing force applied to the pressure plate by the pressing member is released.

In such a clutch device, when the back torque is applied from the output side, the transmitted torque value is regulated by the back torque limiter mechanism. For this reason, it is possible to suppress sudden braking from acting on the tire by the engine brake.

Here, since the back torque limiter mechanism is detachably supported by the output side rotating body, the back torque limit value is changed by replacing only the back torque limiter mechanism according to the situation while using other members in common. Can be changed. In addition, since the back torque limiter mechanism is provided separately from the output side rotating body, it is easy to take measures against wear.

The motorcycle clutch device according to the second invention is the clutch device according to the first invention, wherein the back torque limiter mechanism moves the pressure plate away from the clutch portion.

Here, by moving the pressure plate away from the clutch portion, the pressing force of the plate member in the clutch portion is reduced, and the value of the transmitted torque is reduced.

The clutch device for a motorcycle according to a third aspect is the clutch device according to the second aspect, wherein the output side rotator is a first rotator coupled to the clutch portion, and a second rotator coupled to the output side member. ,have. The back torque limiter mechanism is detachably provided between the first rotating body and the second rotating body with respect to both rotating bodies, and transmits torque between the both rotating bodies.

The clutch device for a motorcycle according to a fourth aspect is the clutch device according to the third aspect, wherein the back torque limiter mechanism is detachably connected to the first rotating body and the second rotating body. And a connected second ring. In addition, the first ring and the second ring have a plurality of torque transmission protrusions protruding in the axial direction on the surfaces facing each other, and the plurality of torque transmission protrusions generate torque from the first ring to the second ring. When the torque is transmitted from the second ring to the first ring, the rings have a predetermined angular range. And a reverse torque transmitting cam surface for rotating the rings relative to each other by a predetermined distance in the axial direction. And a pressure plate moves to the side which leaves | separates from a clutch part by the relative movement of the both axial directions of both rings.

Here, since the back torque limiter mechanism is constituted by two rings, a large number of positive torque transmitting engagement surfaces and reverse torque transmitting cam surfaces can be formed on each ring. For this reason, the surface pressure of the engagement surface and the cam surface can be lowered to suppress wear.

A motorcycle clutch device according to a fifth invention is the clutch device according to the fourth invention, wherein the first rotating body has a pressing end surface for pressing the surface of the pressure plate on the clutch portion side. When the reverse torque is input, the first and second rings move in a direction in which the first ring moves away from the second ring, and the first rotating body moves in the same direction by the movement of the first ring. Then, the pressure plate is moved to the side away from the clutch portion via the pressing end face.

A motorcycle clutch device according to a sixth aspect of the present invention is the clutch device according to the fifth aspect, wherein the first and second rotating bodies each have a plurality of fixing recesses formed along the axial direction. The second ring has a plurality of fixing protrusions that protrude in the axial direction and fit into the plurality of fixing recesses on a surface opposite to the side surface on which the plurality of torque transmission protrusions are provided. The plurality of torque transmission protrusions and the plurality of fixing protrusions are arranged so as to be shifted in the circumferential direction.

Here, in order to keep the axial dimension of the apparatus short, the axial dimension (thickness) of each ring is preferably thin. That is, it is preferable that the portion where the plurality of torque transmission protrusions are not formed is thin. However, if the thickness of each ring is reduced, the strength is lowered and the ring is damaged.

Therefore, in the invention according to the sixth aspect of the present invention, a plurality of fixing protrusions protruding in the opposite direction are formed in a portion where the plurality of torque transmission protrusions are not formed. That is, the fixing protrusion is also used as a configuration for increasing the strength of the ring.

A clutch device for a motorcycle according to a seventh aspect is a device for transmitting torque from an engine to an output side member and interrupting torque transmission by operation of a release mechanism, wherein a clutch housing to which torque from the engine is input; The clutch part, the 1st and 2nd rotary body, a pressure plate, a pressing member, a back torque limiter mechanism, and a fixing member are provided. The clutch portion is disposed inside the clutch housing and has one or more plate members for transmitting and interrupting torque input to the clutch housing. The first rotating body is connected to the clutch portion, and the second rotating body is connected to the output side member. The pressure plate presses the plate member of the clutch portion. The pressing member presses the pressure plate with a predetermined pressing force. The back torque limiter mechanism is detachably provided between the first rotating body and the second rotating body, and transmits torque from the first rotating body to the second rotating body. When torque is generated, the transmission torque value of the clutch portion is restricted to a predetermined value or less. The fixing member is provided to fix the second rotating body in the axial direction with respect to the output side member, and is arranged so as not to overlap the first rotating body in the radial direction.

In this clutch device, the pressing force by the pressing member acts on the clutch portion via the pressure plate, and the clutch is on (torque transmission state). In this state, torque from the input side member is input to the clutch housing and output to an output side member such as an input shaft of the transmission via the clutch portion and the first and second rotating bodies. When the clutch is turned off (torque transmission is interrupted), when the pressing member is operated by the release member, the pressing force applied to the pressure plate by the pressing member is released.

Here, since the back torque limiter mechanism is detachably supported by the first and second rotating bodies, only the back torque limiter mechanism is exchanged according to the situation while using other members in common. The regulation value can be changed. In addition, since the back torque limiter mechanism is provided separately from the first and second rotating bodies, it is easy to take measures against wear.

Further, the second rotating body is fixed in the axial direction to an output side member that is a shaft of the transmission, for example, by a fixing member, but the fixing member is arranged so as not to overlap the first rotating body in the radial direction. For this reason, the first rotating body can be attached and detached without removing the fixing member, and the replacement work of the back torque limiter mechanism arranged between the both rotating bodies becomes easy.

The clutch device for a motorcycle according to an eighth aspect of the present invention is the clutch device according to the seventh aspect, wherein the output side member is a shaft having a screw formed at the tip, the fixing member is screwed to the screw, and the side surface is rotated second. It is a nut that contacts the side surface of the inner periphery of the body.

Here, the nut is screwed into the screw at the end of the shaft so that the side surface of the nut is brought into contact with the side surface of the second rotating body, and the second rotating body is fixed so as not to move in the axial direction.

A two-wheeled vehicle clutch device according to a ninth invention is the clutch device according to the seventh invention, further comprising an elastic body that presses and positions the first rotating body in the axial direction, and the elastic body is detachable without removing the fixing member. is there.

In this case, the attaching / detaching work becomes easy as in the seventh invention.

In the present invention as described above, in the two-wheeled vehicle clutch device provided with the back torque limiter mechanism, the regulation value of the back torque can be easily changed with an inexpensive configuration, and is particularly effective for racing. In addition, it is easy to extend the life of the back torque limiter mechanism. Furthermore, the replacement work of the back torque limiter mechanism is facilitated.

1 is a cross-sectional view of a motorcycle clutch device according to an embodiment of the present invention. FIG. 3 is an external perspective partial view of the clutch device. FIG. 3 is an external perspective view of a ring constituting a back torque limiter mechanism of the clutch device.

[overall structure]
This two-wheeled vehicle clutch device transmits torque from an engine crankshaft to a transmission and cuts off torque by operating a release mechanism. As shown in FIG. 1 and FIG. 2 which is a partial perspective view of the external appearance of this clutch device, power is transmitted between the clutch housing 1, the output side rotating body 2, and the clutch housing 1 and the output side rotating body 2. , A clutch portion 3 for performing shut-off, a first pressure plate 4, a plurality of springs 5, and a back torque limiter mechanism 6. The release mechanism has a release bearing 7 and a release member 8 for moving the release bearing 7 in the axial direction. 1 and FIG. 2 are different in cross-sectional position. Therefore, in FIG. 1, the spring 5 appears in the upper part of the figure, but in FIG. 2, the spring 5 appears in the lower part of the figure.

[Clutch housing]
The clutch housing 1 has a disk-shaped part 10 and a cylindrical part 11 extending from the outer peripheral side of the disk part 10 to the axially outer side (right side in FIG. 1). An input gear (not shown) is attached to the disc portion 10. The input gear meshes with a drive gear (not shown) fixed to the crankshaft on the engine side, and torque from the engine is input to the clutch housing 1 through these gears. The cylindrical portion 11 is formed with a plurality of engaging grooves 11a extending along the axial direction. The engagement groove 11a may penetrate in the radial direction, or may be a bottomed groove whose outer peripheral side is closed.

[Output-side rotating body (clutch center + second pressure plate)]
The output-side rotator 2 is disposed on the inner peripheral portion of the clutch housing 1. The output-side rotator 2 includes a clutch center 14 as a first rotator and a second pressure plate 15 as a second rotator.

<Clutch center>
The clutch center 14 includes a disc portion 16 and a cylindrical portion 17 that extends in the axial direction at the outer peripheral portion of the disc portion 16. A plurality of through holes 16 a penetrating in the axial direction are formed in the disc portion 16. An annular groove 16b is formed at the outer peripheral end portion on the side surface of one side (second pressure plate 15 side) of the disc portion 16. Further, a plurality of fixing recesses 16c that are further recessed in the axial direction are formed in a part of the annular groove 16b. Although not shown in FIG. 2, a spline shaft 17 a is formed on the outer peripheral portion of the cylindrical portion 17. The end face of the cylindrical portion 17 on the first pressure plate 4 side is separated from the first pressure plate 4 in a normal state (a state where the back torque is not applied), but when the back torque is applied, It can contact the side surface of the first pressure plate 4.

<Second pressure plate>
The second pressure plate 15 has a boss 20 at the center and a pressure flange 21 extending from the boss 20 outward in the radial direction. A spline hole 20 a is formed in the inner peripheral portion of the boss 20. The transmission input shaft 22 is engaged with the spline hole 20a.

The pressure flange 21 extends further outward in the radial direction beyond the outer peripheral surface of the clutch center 14, and has an outer diameter substantially the same as the diameter of the outermost peripheral portion of the clutch portion 3. In the pressure flange 21, an annular groove 21 a is formed at a position facing the annular groove 16 b of the clutch center 14. Further, a plurality of fixing recesses 21b penetrating in the axial direction are formed in a part of the annular groove 21a. A screw hole 21c penetrating in the axial direction is formed on the inner peripheral side of the annular groove 21a of the pressure flange 21.

The inner peripheral surface of the disc portion 16 of the clutch center 14 is in contact with the outer peripheral surface of the boss 20 of the second pressure plate 15, thereby centering the clutch center 14 (positioning in the radial direction). It has been broken.

[Clutch part]
The clutch unit 3 includes a plurality of first clutch plates 26 and second clutch plates 27, respectively. Both the

clutch plates

26 and 27 are formed in an annular shape and are alternately arranged in the axial direction. Further, a plurality of engaging projections projecting outward are formed on the outer peripheral portion of the first clutch plate 26, and these engaging projections are formed in the engaging grooves 11 a formed in the tubular portion 11 of the clutch housing 1. Engages freely in the axial direction. The first clutch plate 26 has friction facings on both sides. The second clutch plate 27 has splines formed on the inner peripheral portion thereof, and the splines on the inner peripheral portion mesh with a spline shaft 17 a formed on the outer peripheral surface of the clutch 14 so as to be movable in the axial direction.

[First pressure plate]
The first pressure plate 4 includes a cylindrical boss 30 formed on the inner peripheral side, and a disk-shaped pressure flange 31 extending outward from the boss 30.

The boss 30 is a part where a release mechanism including the release bearing 7 is connected to the inner periphery. By moving the boss 30 to the right side in FIG. 1 via the release bearing 7 by the release member 8, the clutch can be turned off (torque transmission is interrupted).

The pressure flange 31 is further disposed on the outer side in the axial direction of the first clutch plate 26 disposed on the outermost side. That is, the pressure flange 31 is disposed at a position facing the pressure flange 21 of the second pressure plate 15 with the clutch portion 3 interposed therebetween. The outer diameter of the pressure flange 31 is substantially the same as the outer diameter of the pressure flange 21 of the second pressure plate 15. As described above, when the back torque is applied, the axial end surface of the clutch center 14 can come into contact with the inner peripheral portion of the pressure flange 31.

The boss 30 is formed with a plurality of circular recesses 30a that are recessed toward the second pressure plate 15 side. A through hole is formed in the bottom surface of the circular recess 30a, and the spring support member 34 passes through the through hole. A male screw 34 a is formed at one end of the spring support member 34, and the male screw 34 a is screwed into a screw hole 21 c formed in the second pressure plate 15. Further, the spring support member 34 is formed with a screw hole 34b from the outer end (right side in FIG. 1) to the inner side (left side in FIG. 1).

[spring]
The plurality of springs 5 are respectively inserted into the circular recesses 32 a of the first pressure plate 4 and supported by spring support members 34. A support washer 36 is fixed to the end surface of the spring support member 34 by a set bolt 37. Thus, the spring 5 is set in a compressed state between the bottom surface of the circular recess 32a and the support washer 36. The first pressure plate 4 is pressed toward the second pressure plate 15 by the urging force of the spring 5. In this way, the first and second

clutch plates

26 and 27 of the clutch portion 3 are sandwiched between the first pressure plate 4 and the second pressure plate 15 by the plurality of springs 5.

[Axial positioning of clutch center]
A spring 24 is disposed between the clutch center 14 and the first pressure plate 4. More specifically, between the outer side surface (side surface on the first pressure plate 4 side) in the inner peripheral portion of the clutch center 14 and the inner side surface (side surface on the transmission side) in the inner peripheral portion of the first pressure plate 4. Is provided in a state in which the spring 24 is compressed. The urging force of the spring 24 restricts the movement of the clutch center 14 in the axial direction.

[Back torque limiter mechanism]
The back torque limiter mechanism 6 transmits the torque transmitted from the clutch portion 3 to the clutch center 14 to the second pressure plate 15 and moves the first pressure plate 4 away from the clutch portion 3 to regulate the back torque. It is a mechanism to do. The back torque limiter mechanism 6 is disposed between the clutch center 14 and the second pressure plate 15, more specifically, in the annular groove 16 b of the clutch center 14 and the annular groove 21 a of the second pressure plate 15. .

The back torque limiter mechanism 6 has a first ring 40 and a second ring 41. The first ring 40 is detachably disposed in the annular groove 16 b of the clutch center 14. The second ring 41 is detachably disposed in the annular groove 21 a of the second pressure plate 15.

FIG. 3 shows the first ring 40 and the second ring 41 separately. As shown in this figure, the first ring 40 has a plurality of torque transmitting protrusions 42 on the side surface facing the second ring 41 and a plurality of fixing protrusions 43 on the opposite side surface. Each of the plurality of torque transmission protrusions 42 has a positive torque transmission engagement surface 42a parallel to the rotation axis at one end in the circumferential direction and a reverse torque transmission cam surface 42b inclined at the other end. Yes. The cam surface 42b is inclined so as to expand from the tip toward the base side. Further, each of the plurality of fixing protrusions 43 has surfaces parallel to the rotation axis at both ends in the circumferential direction. The fixing protrusion 43 is fitted in a fixing recess 16c formed in the annular groove 16b.

It should be noted that the plurality of torque transmission protrusions 42 and the plurality of fixing protrusions 43 are arranged so as to be shifted in the circumferential direction. More specifically, as shown in FIG. 3, the fixing projection 43 is located within the range of the portion A where the torque transmission projection 42 is formed (between the root portion of the surface 42a and the root portion of the surface 42b). A portion B that is not formed is included. With such an arrangement, even though the axial thickness of the first ring 40 is suppressed, a substantially uniform thickness is ensured over the entire circumference, and high strength is maintained.

The second ring 41 is formed symmetrically with the first ring 40, and the basic configuration is exactly the same as the first ring 40. In other words, a plurality of torque transmission protrusions 52 are provided on the side surface facing the first ring 40, and a plurality of fixing protrusions 53 are provided on the opposite side surface. Each of the plurality of torque transmission protrusions 52 has a positive torque transmission engagement surface 52a parallel to the rotation axis at one end in the circumferential direction, and a reverse torque transmission cam surface 52b at the other end. Each of the plurality of fixing protrusions 53 has a surface parallel to the rotation axis at both ends in the circumferential direction, and the fixing protrusions 53 are fitted into the fixing recesses 21b formed in the annular groove 21a. It is out. The same is true in that the plurality of torque transmission protrusions 52 and the plurality of fixing protrusions 53 are arranged so as to be shifted in the circumferential direction.

[Fixing member (nut)]
A male screw (not shown) is formed at the tip of the input shaft 22 of the transmission, and a nut 23 as a fixing member is screwed to the male screw. The nut 23 is screwed into a male screw at the tip of the input shaft, so that the inner end surface of the nut 23 is in contact with the outer end surface of the second pressure plate 15. As a result, the movement of the second pressure plate 15 and thus the entire clutch device in the axial direction is restricted. The outer diameter of the nut 23 is smaller than the inner diameter of the clutch center 14. That is, the clutch center 14 and the nut 23 are arranged so as not to overlap in the radial direction. Further, the outer diameter of the nut 23 is smaller than the inner diameter of the spring 24. That is, the nut 23 and the spring 24 are arranged so as not to overlap in the radial direction. For this reason, the spring 24 and the clutch center 14 can be attached and detached without removing the nut 23.

[Operation]
In the state shown in FIG. 1, the first pressure plate 4 is pressed toward the second pressure plate 15 by the urging forces of the plurality of springs 5, and the first and second

clutch plates

26, 27 of the clutch portion 3 are moved to these pressures. It is sandwiched between the

plates

4 and 15. In this state, the clutch is in an on state, and torque input from the engine to the clutch housing 1 is transmitted to the clutch center 14 via the clutch portion 3 and further to the second pressure plate 15 via the back torque limiter mechanism 6. Is transmitted to the input shaft 22 of the transmission.

Here, in the back torque limiter mechanism 6, when torque is transmitted from the engine to the transmission side, the torque of the positive torque transmission engagement surface 42 a of the torque transmission protrusion 42 of the first ring 40 and the torque of the second ring 41. The positive torque transmission engagement surface 52a of the transmission projection 52 abuts. Therefore, torque is transmitted between the

rings

40 and 41 while being in close contact with each other.

On the other hand, when the output side rotation exceeds the input side rotation number and the back torque acts, the reverse torque transmission cam surface 42b of the torque transmission projection 42 of the first ring 40 and the second ring are caused by this back torque. The torque transmission protrusions 52 of the 41 are in pressure contact with the reverse torque transmission cam surface 52b. Thus, when the cam surfaces 42b and 52b of both the

rings

40 and 41 are pressed against each other, a thrust force is generated in both the

rings

40 and 41. As a result, the first ring 40 pushes the clutch center 14 toward the first pressure plate 4 against the urging force of the

springs

5, 24, and the clutch center 14 and the first pressure plate 4 are separated from the second pressure plate 15. Move to. Accordingly, the pressing force of the first pressure plate 4 against the clutch portion 3 is smaller than when the back torque is not acting. For this reason, the transmission torque in the clutch unit 3 is restricted to a predetermined value smaller than that in the case where the back torque is not acting. That is, in the state where the back torque is applied, the clutch unit 3 can transmit only a small torque compared to the normal case of transmitting torque from the engine to the transmission side.

As described above, when the back torque acts, the transmission torque in the clutch portion 3 is restricted to a predetermined value or less. When the back torque no longer acts, the clutch center 14 moves in the opposite direction by the urging force of the spring 24. Thereby, both

rings

40 and 41 are reset to an initial state.

Here, depending on the race course situation, you may want to change the regulation value for back torque. In this case, the set bolt 37 is removed from the spring support member 34. Thereby, the 1st pressure plate 4 and the clutch center 14 can be pulled out to the axial direction outer side (left side of FIG. 1), and can be removed out of an apparatus. In this state, the first and

second rings

40 and 41 can be easily removed, so that they are replaced with a ring set having a cam surface with a different inclination angle. Other members do not need to be replaced and can be shared. In particular, when replacing the

rings

40 and 41, it is not necessary to remove the nut 23, so that the replacement work becomes very easy.

Note that when the clutch is turned off, it is exactly the same as a conventionally known operation. That is, when the rider grips the clutch lever, the operating force is transmitted to the release bearing 7 via the clutch wire or the like, and the release bearing 7 moves to move the first pressure plate 4 away from the clutch portion 3. . Thereby, the pressing force with respect to the clutch part 3 of the 1st pressure plate 4 is cancelled | released, and the clutch part 3 will be in an OFF state. In this clutch-off state, torque from the clutch housing 1 is not transmitted to the clutch center 14 side.

[Characteristic]
(1) The back torque limiter mechanism 6 includes two

rings

40 and 41 that are detachable from the clutch center 14 and the second pressure plate 15. For this reason, when it is desired to change the regulation value of the back torque, only the two

rings

40 and 41 need to be replaced. Therefore, the regulation value of the back torque can be easily changed at low cost. Moreover, since the two

rings

40 and 41 only have the fixing

protrusions

43 and 53 fitted in the fixing recesses of the clutch center 14 and the second pressure plate 15, no special tools or the like are required for replacement. It can be easily attached and detached.

(2) When the two

rings

40 and 41 are exchanged, it is not necessary to remove the nut 23 screwed to the transmission shaft, so that the exchange work is facilitated.

(3) Since the back torque limiter mechanism 6 includes the two

rings

40 and 41, a large number of

torque transmission protrusions

42 and 52 can be provided. For this reason, the surface pressure of the torque transmission surface can be reduced, and wear of the torque transmission surface can be suppressed.

(4) A plurality of fixing

protrusions

43 and 53 protruding to the opposite side are formed in the portions where the

torque transmission protrusions

42 and 52 are not formed. That is, since the fixing protrusion is also used as a configuration for increasing the strength of the ring, the strength can be kept high in a small space.

[Other Embodiments]
The present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the scope of the present invention.

(A) The spring 24 for positioning the clutch center 14 in the axial direction is not limited to the above embodiment. As long as it is between the clutch center 14 and the 1st pressure plate 4, you may provide anywhere and you may use biasing members, such as a cone spring.

(B) In the above-described embodiment, the fixing

protrusions

43 and 53 are formed so as to protrude in the axial direction in each of the

rings

40 and 41. However, a plurality of protrusions protruding in the radial direction are provided, and these protrusions are connected to the clutch center and the You may make it insert in the recessed part of a 2 pressure plate.

(C) In the embodiment described above, the coil spring is used as the pressing member, but other members such as a diaphragm spring may be used.

As described above, in this motorcycle clutch device, the regulation value of the back torque can be easily changed with an inexpensive configuration, and is particularly effective for racing. In addition, it is easy to extend the life of the back torque limiter mechanism. Furthermore, the replacement work of the back torque limiter mechanism is facilitated.

DESCRIPTION OF SYMBOLS 1 Clutch housing 3 Clutch part 4 1st pressure plate 5 Spring 6 Back torque limiter mechanism 14 Clutch center (1st rotary body)
15 Second pressure plate (second rotating body)
16b, 21a

annular groove

16c, 21b fixing recess 23 nut (fixing member)
26, 27 Clutch plate 40 First ring 41

Second ring

42, 52

Torque transmission projections

42a, 52a Positive torque transmission engagement surfaces 42b, 52b Reverse torque transmission cam surfaces 43, 53 Fixing projections

Claims

A clutch device for a motorcycle that transmits torque from an engine to an output side member and interrupts torque transmission by operating a release mechanism,
A clutch housing to which torque from the engine is input;
An output side rotating body coupled to the output side member;
A clutch portion having one or more plate members for transmitting and interrupting torque between the clutch housing and the output-side rotating body;
A pressure plate for pressing the plate member of the clutch part;
A pressing member that presses the pressure plate with a predetermined pressing force;
A back torque limiter mechanism that is detachably supported by the output side rotating body, and that regulates a transmission torque value of the clutch portion to a predetermined value or less when a back torque is generated;
A clutch device for a motorcycle equipped with a motor.
The motorcycle clutch device according to claim 1, wherein the back torque limiter mechanism moves the pressure plate to a side away from the clutch portion.
The output-side rotator includes a first rotator coupled to the clutch unit, and a second rotator coupled to the output-side member,
The back torque limiter mechanism is detachably provided between the first rotating body and the second rotating body with respect to the both rotating bodies, and transmits torque between the both rotating bodies.
The clutch device for a motorcycle according to claim 2.
The back torque limiter mechanism includes a first ring detachably connected to the first rotating body, and a second ring detachably connected to the second rotating body,
The first ring and the second ring have a plurality of torque transmission protrusions that protrude in the axial direction on opposite surfaces, and the plurality of torque transmission protrusions from the first ring to the second ring. When the torque is transmitted to the first ring, there is a positive torque transmitting engagement surface that engages the two rings so that they do not rotate relative to each other, and when the torque is transmitted from the second ring to the first ring, A reverse torque transmission cam surface for rotating both rings relative to each other within a predetermined angular range and separating the rings by a predetermined distance in the axial direction;
The pressure plate moves to the side away from the clutch portion by the relative movement in the axial direction of the two rings;
The motorcycle clutch device according to claim 3.
The first rotating body has a pressing end surface for pressing the surface on the clutch part side of the pressure plate,
When the reverse torque is input, the first and second rings move in a direction in which the first ring moves away from the second ring, and the movement of the first ring causes the first rotating body to move in the same direction. Moving in the direction to move the pressure plate away from the clutch portion via the pressing end face;
The clutch device for a motorcycle according to claim 4.
The first and second rotating bodies each have a plurality of fixing recesses formed along the axial direction,
The first and second rings have a plurality of fixing protrusions protruding in an axial direction on a surface opposite to a side surface on which the plurality of torque transmitting protrusions are provided and fitted in the plurality of fixing recesses, respectively. Have
The plurality of torque transmission protrusions and the plurality of fixing protrusions are arranged so as to be shifted in the circumferential direction.
The clutch device for a motorcycle according to claim 5.
A clutch device for a motorcycle that transmits torque from an engine to an output side member and interrupts torque transmission by operation of a release mechanism,
A clutch housing to which torque from the engine is input;
A clutch portion that is disposed inside the clutch housing and has one or more plate members for transmitting and blocking torque input to the clutch housing;
A first rotating body coupled to the clutch portion;
A second rotating body coupled to the output side member;
A pressure plate for pressing the plate member of the clutch part;
A pressing member that presses the pressure plate with a predetermined pressing force;
Between the first rotator and the second rotator, the rotator is detachably provided to transmit torque from the first rotator to the second rotator and back torque. A back torque limiter mechanism for restricting the transmission torque value of the clutch portion to a predetermined value or less when
A fixing member provided to fix the second rotating body in the axial direction with respect to the output-side member, and disposed so as not to overlap the first rotating body in the radial direction;
The clutch device for two-wheeled vehicles provided with.
The output side member is a shaft having a screw formed at the tip,
The fixing member is a nut that is screwed onto the screw and whose side surface is in contact with the side surface of the inner peripheral portion of the second rotating body.
The clutch device for a motorcycle according to claim 7.
An elastic body that presses and positions the first rotating body in the axial direction;
The elastic body is detachable without removing the fixing member,
The clutch device for a motorcycle according to claim 7.