WO2013133364A1

WO2013133364A1 - Clutch device for motor cycle

Info

Publication number: WO2013133364A1
Application number: PCT/JP2013/056259
Authority: WO
Inventors: 義夫今西; 亮一今井
Original assignee: 株式会社エクセディ
Priority date: 2012-03-09
Filing date: 2013-03-07
Publication date: 2013-09-12
Also published as: JP5272089B1; CN104145128A; JP2013185675A

Abstract

A clutch device for a motor cycle is configured so that pressing force applied to a clutch section can be increased by a cam mechanism, and the clutch device allows release operation to be performed with reduced force. This device is provided with a clutch housing (1), a clutch center (2) which is disposed at the inner periphery of the clutch housing (1), a clutch section (3), a pressure plate (4) which presses the clutch plates (25, 26) of the clutch section (3) and to which torque is transmitted, a release member (5), coiled springs (6), and a cam mechanism (7). The release member (5) is disposed so that torque cannot be transmitted between the release member (5) and the pressure plate (4), and the release member (5) presses the pressure plate (4) and releases pressing force. The coiled springs (6) apply pressing force to the pressure plate (4) through the release member (5). The cam mechanism (7) increases the pressing force of the pressure plate (4).

Description

Motorcycle clutch device

The present invention relates to a clutch device, and more particularly to a motorcycle clutch device that transmits power from an input-side member to an output-side member and interrupts power transmission by operating a release mechanism.

Generally, in a motorcycle such as a motorcycle or a buggy, a multi-plate clutch device is used to transmit or block power from an engine to a transmission. The multi-plate clutch device includes a clutch housing connected to the crankshaft side of the engine, a clutch center connected to the transmission side, a clutch portion for transmitting and shutting power between them, and a clutch portion. And a pressure plate for pressing. The clutch portion has a first clutch plate that engages with the clutch housing and a second clutch plate that engages with the clutch center, and both clutch plates are alternately arranged in the axial direction.

Also, in the motorcycle clutch device disclosed in Patent Document 1, a cam mechanism is provided between the clutch center and the pressure plate. The pressure plate is applied with a pressing force to the clutch portion by a plurality of coil springs. When the cam mechanism is provided, when the relative rotational difference is generated between the clutch center and the pressure plate, the pressure plate The pressing force to the clutch portion can be increased.

JP-A 61-149618

In the device disclosed in Patent Document 1, most of the torque from the clutch portion is transmitted to the pressure plate, and further transmitted from the pressure plate to a member on the transmission side via the cam mechanism and the clutch center. Then, by transmitting torque to the pressure plate, the pressing force as described above can be increased by the action of the cam mechanism.

By the way, in the apparatus as described above, when the clutch is turned off, the pressure plate needs to be moved away from the clutch portion by the release mechanism.

However, as described above, the pressure plate is subjected not only to the pressing force by the coil spring but also to the increase due to the action of the cam mechanism. Therefore, for example, in a situation where torque is transmitted from the clutch portion to the pressure plate as in acceleration, a large release force is required when the clutch is turned off, and in the case of a motorcycle, the operation force of the clutch lever becomes heavy. .

An object of the present invention is to prevent a clutch release operation force from becoming heavy in a motorcycle clutch device in which a pressing force to a clutch portion can be increased by a cam mechanism.

A motorcycle clutch device according to a first aspect of the present invention is a device that transmits power from an input side member to an output side member and interrupts power transmission by operating a release mechanism, and is coupled to the input side member. A clutch center disposed on the inner peripheral portion of the clutch housing and connected to the output side member, a clutch portion having one or more plate members disposed on the inner peripheral portion of the clutch housing, A pressure plate that presses the plate member and transmits at least part of the torque from the clutch portion, a release member, a pressing member, and a cam mechanism are provided. The release member is disposed so that torque cannot be transmitted to the pressure plate, and is a member for pressing the pressure plate with a predetermined pressing force and releasing the pressing force by operating the release mechanism. The pressing member is a member that applies a pressing force to the pressure plate via the release member. The cam mechanism is provided between the clutch center and the pressure plate, and moves the pressure plate to the clutch portion side when a relative rotational difference occurs between them, and transmits torque from the pressure plate to the clutch center.

In this device, torque is input from the input side member to the clutch housing. The input torque is transmitted from the clutch housing to the pressure plate via the clutch portion when the plate member of the clutch portion is pressed by the pressure plate. The torque transmitted to the pressure plate is transmitted to the clutch center via the cam mechanism and further transmitted to the output side member.

In the clutch-on state of this device, torque acts on the pressure plate, and this torque is transmitted to the clutch center via the cam mechanism, so that the pressure plate is moved to the clutch portion side by the action of the cam mechanism. Accordingly, the pressing force to the clutch portion of the pressure plate increases.

When releasing the clutch, the release member is actuated by the release mechanism, thereby releasing the pressing force to the clutch portion of the pressure plate. Here, in the clutch-on state, the pressure plate and the release member are merely in contact with each other, and torque is not transmitted between them. Therefore, the operating force for moving the release member only needs to be larger than the pressing force of the pressing member, and it is not necessary to consider the increase in the pressing force by the cam mechanism.

Here, when the clutch is on, the pressing force to the clutch portion can be increased by the cam mechanism. On the other hand, at the time of release for clutch-off operation, the release member is separated from the cam mechanism, so that it is only necessary to apply a force larger than the pressing force of the pressing member, and the release operation can be performed with a relatively small force.

The motorcycle clutch device according to the second aspect of the present invention is the first side device in which the clutch center and the release member are engaged so as to be axially movable but not relatively rotatable.

In this device, it is necessary to arrange the clutch center and the pressure plate so that they can rotate relative to each other. In the conventional apparatus, since the pressure plate also functions as a release member, a relative rotational difference occurs between the clutch center and the release member.

In the above situation, when a relative rotational difference occurs between the clutch center and the release member (pressure plate), the member supported by the clutch center or the release member (pressure plate) has a relative rotational difference. May collide with other members. Therefore, the conventional apparatus has a problem that wear of the colliding portion is increased. Moreover, in order to avoid a collision, it is necessary to provide a gap between the members.

Therefore, in the apparatus of the second aspect, paying attention to the fact that the release member and the pressure plate are formed as separate members, the clutch center and the release member are engaged with each other so that they cannot rotate relative to each other. It is combined.

Here, collision between the release member and the clutch center and other members provided in the release center can be avoided. Moreover, since it is not necessary to provide a gap between the two, it is possible to achieve compactness.

The motorcycle clutch device according to the third aspect of the present invention is the device according to the first or second aspect, wherein the clutch center has a friction portion facing the pressure plate on the outer peripheral portion. The plate member of the clutch portion includes a first clutch plate that engages with the clutch housing and a second clutch plate that engages with the pressure plate, and the first and second clutch plates include the friction portion of the clutch center and the pressure plate. Is sandwiched between.

Here, the first and second clutch plates constituting the clutch portion are sandwiched between the friction portion of the clutch center and the pressure plate, and the power is transmitted from the clutch housing, the first clutch plate, the second clutch plate, the pressure plate, It is transmitted through the path of the cam mechanism and clutch center.

The motorcycle clutch device according to the fourth aspect of the present invention is the device according to any one of the first to third aspects, wherein the pressing member is a plurality of coil springs that urge the release member toward the clutch portion.

The motorcycle clutch apparatus according to the fifth aspect of the present invention is the apparatus according to the fourth aspect, wherein the clutch center has a plurality of supporting protrusions protruding toward the release member in the axial direction. The release member has a plurality of storage portions each having a hole through which the support protrusion passes and a recess for storing the support protrusion. The coil spring is supported by the supporting protrusion in the concave portion of the storage portion, and one end portion biases the release member.

In the present invention as described above, the release operation force of the clutch can be reduced in the motorcycle clutch device in which the pressing force to the clutch portion can be increased by the cam mechanism.

1 is a longitudinal sectional view of a motorcycle clutch device according to an embodiment of the present invention. The longitudinal cross-sectional view of the position different from FIG. 1 of the said clutch apparatus for motorcycles. FIG. 5 is a cross-sectional view taken along the line III-III in FIG. 4 showing a part of the cross section of the clutch center. The figure which looked at a part of clutch center from the axial direction outer side. The VV sectional view taken on the line of FIG. 4 which shows a 1st cam part. FIG. 8 is a cross-sectional view taken along line VI-VI in FIG. 7 showing a part of the cross section of the pressure plate. The figure which looked at a part of pressure plate from the axial direction outer side. FIG. 5 is a sectional view taken along line VIII-VIII in FIG. 4 showing a second cam portion. Sectional drawing which shows the contact state of a 1st cam part and a 2nd cam part. FIG. 12 is a sectional view taken along line XX of FIG. 11 showing a section of the release member. The figure which looked at a part of release member from the axial direction inner side. FIG. 12 is a sectional view taken along line XXII in FIG. 11.

[overall structure]
1 and 2 show a cross-sectional configuration of a motorcycle clutch device according to an embodiment of the present invention. FIG. 2 shows a cross section different from that of FIG. 1, and shows only a part of the cross-sectional configuration. The motorcycle clutch device transmits power from an engine crankshaft to a transmission, and shuts off the power by turning off a clutch by operating a release mechanism. This clutch device includes a clutch housing 1, a clutch center 2, a clutch portion 3, a pressure plate 4, a release member 5, a plurality of coil springs 6, and a cam mechanism 7.

[Clutch housing 1]
The clutch housing 1 has a disc portion 10 and a cylindrical portion 11 extending from the outer peripheral side of the disc portion 10 to the axially outer side (right side in FIG. 1).

The disc portion 10 is formed with a plurality of projections 10a protruding inward in the axial direction (leftward in FIG. 1) at predetermined intervals in the circumferential direction. An input gear 13 is connected to the side of the disc portion 10 via a plurality of annular rubber members 12. The plurality of protrusions 10 a and the plurality of rubber members 12 of the disc portion 10 are inserted into holes 13 a formed in the input gear 13. The clutch housing 1 and the input gear 13 are connected in the axial direction via a plate 14 and a rivet 15. The input gear 13 is meshed with a drive gear (not shown) fixed to the crankshaft on the engine side. The rubber member 12 is provided to absorb vibration from the engine.

A plurality of notches 11 a extending in the axial direction are formed in the cylindrical portion 11 at predetermined intervals in the circumferential direction.

[Clutch center 2]
The clutch center 2 is disposed on the inner peripheral portion of the clutch housing 1. The clutch center 2 is formed in a substantially disk shape, an annular friction portion 17 is formed on the outer peripheral portion, and a spline hole 18 is formed on the inner peripheral portion.

The clutch center 2 includes an annular positioning projection 19 formed on the inner peripheral portion of the friction portion 17 so as to protrude outward in the axial direction, three supporting projections 20, three

first cam portions

21, 3 Two engaging projections 22 (see FIG. 2).

The three support protrusions 20 are formed to protrude outward in the axial direction on the inner peripheral side of the positioning protrusion 19. The three supporting protrusions 20 are arranged at equiangular intervals in the circumferential direction, and screw holes 20a extending in the axial direction are formed at the central portions thereof.

Details of the first cam portion 21 are shown in FIGS. 3 is a cross-sectional view taken along line III-III in FIG. 4, and FIG. 5 is a cross-sectional view taken along line VV in FIG. FIG. 4 is a view of the clutch center 2 as viewed from the outside in the axial direction. The first cam portion 21 is formed so as to protrude outward in the axial direction, and is open on the inner side and the outer peripheral side in the axial direction. And the 1st cam surface 21a which inclines along an axial direction is formed in the surface inside an axial direction.

As shown in FIGS. 2 and 4, the three engagement protrusions 22 are formed to protrude outward in the axial direction at the same position as the positioning protrusion 19 in the radial direction.

As shown in FIG. 1, a thrust plate 23 is provided between the inner periphery of the clutch center 2 and the inner periphery of the input gear 13.

[Clutch part 3]
The clutch unit 3 includes three first clutch plates 25 and two second clutch plates 26. Both of these

clutch plates

25 and 26 are formed in an annular shape and are alternately arranged in the axial direction.

A plurality of engaging protrusions are formed on the outer peripheral portion of the first clutch plate 25 so as to protrude to the outer peripheral side, and the engaging protrusions are engaged with the notches 11 a formed in the cylindrical portion 11 of the clutch housing 1. . Therefore, the first clutch plate 25 is movable in the axial direction with respect to the clutch housing 1 and is not relatively rotatable. The first clutch plate 25 has friction facings on both sides. The friction facing of the first clutch plate 25 arranged on the innermost side in the axial direction can be frictionally engaged with the friction portion 17 of the clutch center 2. Further, the second clutch plate 26 has a plurality of engaging protrusions protruding inward on the inner peripheral end.

A flanged pin 27 is provided in the inner peripheral portion of the second clutch plate 26 so as to penetrate in the axial direction. A spring 28 is provided between the flange of the flanged pin 27 and the pressure plate 4. Thereby, when the clutch is off (power cut-off state), a slight drag torque is generated to smoothly engage the gear from the neutral to the first speed.

[Pressure plate 4]
The pressure plate 4 is a substantially annular member, and is disposed further outside the first clutch plate 25 disposed on the outermost side in the axial direction. The pressure plate 4 includes an annular pressing portion 30 formed on the outer peripheral portion, an annular engaging portion 31 formed on the inner peripheral side of the pressing portion 30, three second cam portions 32, and an abutting portion 33. And have.

The pressing portion 30 is capable of frictional engagement and frictional engagement with the first clutch plate 25 disposed on the outermost side in the axial direction. The pressing portion 30 is disposed to face the friction portion 17 of the clutch center 2, and the first and second

clutch plates

25 and 26 are sandwiched between the pressing portion 30 and the friction portion 17, and the clutch is turned on ( Power transmission state).

The engaging portion 31 has a plurality of concave portions 31a that open to the outer peripheral side. A plurality of engaging projections formed on the inner peripheral end of the second clutch plate 26 are engaged with the plurality of recesses 31a. Therefore, the second clutch plate 26 is movable in the axial direction with respect to the pressure plate 4 and is not relatively rotatable. Further, the pressure plate 4 is positioned in the radial direction by the inner peripheral surface of the engaging portion 31 contacting the outer peripheral surface of the positioning projection 19 of the clutch center 2.

Details of the second cam portion 32 are shown in FIGS. 6 is a cross-sectional view taken along line VI-VI in FIG. 7, and FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. FIG. 7 is a view of the pressure plate 4 as viewed from the outside in the axial direction. The second cam portion 32 is formed to protrude further from the engagement portion 31 toward the inner peripheral side. As is apparent from FIG. 7, the boundary between the second cam portion 32 and the engaging portion 31 is formed to be continuous with a curve in order to avoid stress concentration. A second cam surface 32a that is inclined along the axial direction is formed at a substantially ½ portion in the circumferential direction at the inner circumferential tip of the second cam portion 32. The second cam surface 32a is inclined in the same manner as the first cam surface 21a of the first cam portion 21, and the cam mechanism 7 is formed by bringing the cam surfaces 21a and 30a into contact with each other. FIG. 9 shows a sectional view of the cam surfaces 21a and 30a in contact with each other.

[Release member 5]
10 to 12 show details of the release member 5. 10 is a cross-sectional view taken along line XX in FIG. 11, and FIG. 12 is a cross-sectional view taken along line XXII in FIG. Moreover, FIG. 11 is the figure which looked at the release member 5 from the axial direction inner side. The release member 5 is a member having a circular outer shape, and a hole 5a to which a release operation mechanism (not shown) is connected is formed at the center. The release member 5 includes three storage portions 34 for storing coil springs, three engagement protrusions 35, and an annular contact portion 36.

The three storage portions 34 are formed so as to protrude inward in the axial direction, and are arranged at equiangular intervals in the circumferential direction. Each storage portion 34 has a circular concave portion 34a on the outer side in the axial direction, and a hole 34b penetrating in the axial direction on the side wall on the inner side in the axial direction (the bottom wall of the concave portion 34a). The support protrusion 20 of the clutch center 2 is inserted through the through hole 34b.

The three engaging projections 35 are formed between the three storage portions 34 so as to protrude inward in the axial direction, and are arranged at equiangular intervals in the circumferential direction. The three engagement protrusions 35 are formed at the same position in the radial direction as the engagement protrusions 22 of the clutch center 2, and the end faces in the circumferential direction of both the

engagement protrusions

22 and 35 can contact each other. The clutch center 2 and the release member 5 can rotate in synchronization with each other by the engagement of both the

engagement protrusions

22 and 35.

The contact portion 36 is formed on the outermost peripheral portion of the release member 5. The contact portion 36 is disposed at the same position as the contact portion 33 of the pressure plate 4 in the radial direction, and both

contact portions

33 and 36 can contact each other.

[Coil spring 6]
The coil spring 6 is disposed on the outer periphery of the support protrusion 20 of the clutch center 2 in the recess 34 a of the storage portion 34 of the release member 5. A spring seat 37 is fixed to the front end portion of the supporting protrusion 20 by a bolt 38. The bolt 38 is screwed into the screw hole 20 a of the support protrusion 20. Thus, the coil spring 6 is mounted in a compressed state between the bottom wall of the recess 34 a of the storage portion 34 and the spring seat 37.

[Operation]
As shown in FIG. 1, when the release operation of the clutch is not performed, the release member 5 and the clutch center 2 are subjected to a force by the coil spring 6 in the direction in which they are drawn together. The pressing force of the release member 5 toward the clutch center 2 is transmitted to the pressure plate 4 via the

contact portions

33 and 36. For this reason, the

clutch plates

25 and 26 of the clutch part 3 are sandwiched between the friction part 17 of the clutch center 2 and the pressing part 30 of the pressure plate 4.

In such a state, torque input from the crankshaft of the engine via the input gear 13 and the rubber member 12 is transmitted to the first and second

clutch plates

25 and 26 via the clutch housing 1, and the clutch center 2. And transmitted to the pressure plate 4. The torque transmitted to the pressure plate 4 is transmitted to the clutch center 2 via the cam mechanism 7. At this time, the pressure plate 4 is drawn to the clutch center 2 side (in the axial direction) by the action of the cam mechanism 7, and the pressing force increases. For this reason, the clutch part 3 is firmly clamped between the clutch center 2 and the pressure plate 4, and torque is reliably transmitted by the cam mechanism 7.

The torque transmitted to the clutch center 2 as described above is transmitted to an input shaft (not shown) of the transmission that engages with the spline hole 18 of the clutch center 2.

On the other hand, when the rider grips the clutch lever, the operating force is transmitted to the release operating mechanism via the clutch wire or the like. By this release operation mechanism, the release member 5 is moved outward in the axial direction against the urging force of the coil spring 6. When the release member 5 is moved outward in the axial direction, the contact portion 36 of the release member 5 is separated from the contact portion 33 of the pressure plate 4. For this reason, the pressing force to the clutch part 3 of the pressure plate 4 is cancelled | released, and the clutch part 3 will be in an OFF state. In this clutch-off state, the rotation from the clutch housing 1 is not transmitted to the clutch center 2.

Here, at the time of release operation of the clutch off, the operation force only has to overcome the urging force of the coil spring 6. Specifically, the release member 5 and the pressure plate 4 are merely in contact with the

contact portions

33 and 36 and do not transmit torque to each other. Therefore, the biting force of the cam surface in the cam mechanism 7 has no influence on the release operation of the release member 5. For this reason, the release operation force of the present embodiment is remarkably reduced as compared with a configuration in which the pressure plate is released and the clutch is turned off as in the conventional device.

When the rider releases the clutch lever, the release member 5 is moved to the clutch center 2 side by the coil spring 6 and the clutch is turned on. At this time, due to the action of the cam mechanism 7, the clutch center 2 and the pressure plate 4 are displaced in the rotational direction. If the pressure plate 4 and the release member 5 are integrally formed, the support protrusion 20 of the clutch center 2 and the storage portion 34 of the release member 5 are displaced in the rotational direction, and the coil spring 6 is the storage portion. It will collide with the side wall of the recessed part 34a of 34. Therefore, in the conventional apparatus, the recess of the storage portion is formed long in the rotation direction.

However, in the present embodiment, the clutch center 2 and the release member 5 rotate in synchronization by the

engagement protrusions

22 and 35 of both members, so that there is no deviation due to the action of the cam mechanism 7 between them. Therefore, the concave portion 34a of the storage portion 34 can be circular.

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

(A) In the above-described embodiment, a part of the torque from the clutch housing 1 is transmitted to the clutch center 2 via the clutch portion 3, but all the torque from the clutch housing 1 is transmitted to the pressure plate 4. May be.

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

(C) The shape and structure of the clutch center, pressure plate, and release member of the above embodiment are merely examples, and various modifications are possible.

In the motorcycle clutch device of the present invention, when the pressing force to the clutch portion can be increased by the cam mechanism, the release operation force of the clutch can be reduced.

DESCRIPTION OF SYMBOLS 1 Clutch housing 2 Clutch center 3 Clutch part 4 Pressure plate 5 Release member 6 Coil spring 7 Cam mechanism 13 Input gear 17 Friction part 20 Support protrusion 21 First cam part 21a First cam surface 22

Engagement protrusions

25 and 26 Clutch plate 32 Second cam portion 32a Second cam surface 34 Storage portion 34a Recess 35 Engagement protrusion

Claims

A clutch device for a motorcycle that transmits power from an input side member to an output side member and interrupts power transmission by operation of a release mechanism,
A clutch housing coupled to the input side member;
A clutch center disposed on an inner peripheral portion of the clutch housing and coupled to the output side member;
A clutch portion having one or more plate members disposed on an inner peripheral portion of the clutch housing;
A pressure plate that presses the plate member of the clutch portion and transmits at least part of the torque from the clutch portion;
A release member that is disposed so as to be unable to transmit torque with the pressure plate, presses the pressure plate with a predetermined pressing force, and releases the pressing force by operating the release mechanism;
A pressing member that applies a pressing force to the pressure plate via the release member;
Provided between the clutch center and the pressure plate. When a relative rotational difference occurs between the clutch center and the pressure plate, the pressure plate is moved to the clutch portion side, and torque is transmitted from the pressure plate to the clutch center. A cam mechanism to
The clutch device for motorcycles provided with.
2. The motorcycle clutch device according to claim 1, wherein the clutch center and the release member are engaged in an axially movable and non-rotatable manner.
The clutch center has a friction part facing the pressure plate on an outer peripheral part,
The plate member of the clutch part includes a first clutch plate that engages with the clutch housing, and a second clutch plate that engages with the clutch center and the pressure plate, and the first and second clutch plates are the clutch members. Sandwiched between the friction part of the center and the pressure plate,
The motorcycle clutch device according to claim 1 or 2.
The motorcycle clutch device according to any one of claims 1 to 3, wherein the pressing member is a plurality of coil springs that urge the release member toward the clutch portion.
The clutch center has a plurality of supporting protrusions protruding toward the release member in the axial direction,
The release member has a plurality of storage portions each having a hole through which the support protrusion passes and a recess for storing the support protrusion,
The coil spring is supported by the support protrusion in the recess of the storage portion, and one end portion biases the release member.
The motorcycle clutch device according to claim 4.