JPH0656188B2 - Friction clutch device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, frictions are provided in which driving side clutch plates and driven side clutch plates, which are alternately stacked, are pressure-bonded by a pressing body, and power is transmitted by a frictional force generated between these clutch plates. The present invention relates to a clutch device.

This type of friction clutch device is incorporated in a power transmission path of a vehicle such as a motorcycle. However, when an excessive reverse load (back torque) acts from the driven shaft side due to sudden engine braking, this reverse load is generated. It may directly join the engine and the power transmission path and adversely affect both of them.

As a countermeasure against this, for example, in Japanese Patent Publication No. Sho 51-3189.
No. 3 publication ”, the clutch member connected to the driven shaft is divided in the axial direction, one of the clutch support members is directly connected to the driven shaft, and the other clutch support member and the driven shaft are connected to each other. A friction clutch device in which a one-way clutch that allows only power transmission from a drive source side is interposed is known.

With this configuration, when an excessive reverse load is applied from the driven shaft side, this reverse load is only transmitted to the drive source side via the clutch plate supported by one clutch member, and the load is applied to the drive source side. The number of clutch plates to transmit is reduced.
Therefore, since the clutch capacity apparently decreases,
A slip occurs between the clutch plates, and this slip absorbs a reverse load.

However, according to this configuration, since the reverse load from the driven shaft side is still transmitted from one clutch member to the drive source side through the clutch plate, this clutch plate is worn more than the clutch plate supported by the other clutch member. There is a problem that it becomes easier to do.

The present invention has been made under such circumstances, and it is possible to reliably absorb a reverse load from the driven shaft side before being transmitted to the clutch plate without hindering power transmission from the drive source to the driven shaft. It is an object of the present invention to provide a wear clutch device capable of reducing the wear of the clutch plate.

In order to achieve the above object, the present invention provides a clutch housing that is rotationally driven by power transmission from a drive source,
A clutch member connected to the driven shaft is relatively rotatably accommodated, and a driven clutch plate that rotates integrally with the clutch member and a drive clutch plate that rotates integrally with the clutch housing are pressed against each other by a pressing body. It is premised on a friction clutch device that transmits power by a frictional force generated between these clutch plates.

The clutch member has a boss portion directly connected to the driven shaft and a clutch support portion arranged coaxially outside the boss portion and facing the boss portion, and connected to the driven side clutch plate. An annular driven portion is provided, and the clutch support portion of the driven portion is connected to the boss portion through a one-way clutch that only transmits power from the drive source side toward the driven shaft, and these boss portions are connected. The contact surfaces of the boss portion and the clutch support portion are provided at mutually opposing portions of the clutch support portion and the clutch support portion, which are tapered along the axial direction of the driven shaft and slidably contact each other. Are urged by a spring member in the direction of frictional engagement with each other, and the frictional force generated between the contact surfaces is set to be smaller than the frictional force between the clutch plates.

An embodiment of the present invention will be described below with reference to the drawings applied to a motorcycle.

In FIG. 1, reference numeral 1 is a frame, 2 is an engine, 3 is a front fork, 4 is a fuel tank, 5 is a seat, and 6 is a rear wheel. The engine 2 of the present embodiment has a crankcase 7
This is a V-type engine in which a front cylinder 8 and a rear cylinder 9 are arranged in a substantially V-shape, and in a crankcase 7 thereof, a crankshaft 11 driven by a piston 10 in each of the cylinders 8 and 9, An intermediate shaft 12 as a driven shaft and an output shaft 13 are housed in parallel with each other.

The driven gear 1 is attached to one end of the intermediate shaft 12 via a bearing 14.
5 is rotatably supported. This driven gear 15 is
It constantly meshes with the drive gear 16 on the crankshaft 11. Further, a friction clutch device 17 is attached to the intermediate shaft 12 adjacent to the driven gear 15, and when the friction clutch device 17 is engaged, the crankshaft 1
The rotation of 1 is transmitted to the intermediate shaft 12 via the drive gear 16 and the driven gear 15. The rotation transmitted to the intermediate shaft 12 is selectively reduced in a plurality of stages by the constant mesh type transmission gear mechanism 18, and then transmitted to the output shaft 13.
The rotation of the output shaft 13 is transmitted to the drive shaft 21 in the rear arm 20 via the bevel gears 19 and 19, and the rear wheel 6 is driven by the drive shaft 21.

By the way, details of the friction clutch device 17 are shown in FIG.

That is, reference numeral 22 is a clutch housing having a substantially cylindrical shape, which is coaxially fixed to one end surface of the driven gear 15 and is rotated in conjunction with the crankshaft 11. A clutch member 23 connected to the intermediate shaft 12 is relatively rotatably accommodated in the clutch housing 22. A plurality of drive-side clutch plates 24 ... Are attached to the inner peripheral surface of the clutch housing 22, and the drive-side clutch plates 24 ... Rotate integrally with the clutch housing 22. A plurality of driven-side clutch plates 25 ... Are attached to the outer peripheral surface of the clutch member 23, and these driven-side clutch plates 25 ... Rotate integrally with the clutch member 23. The clutch plates 24, ... Are alternately stacked inside the clutch housing 22.

A release 26 that is movable in the axial direction of the intermediate shaft 12 is disposed on one end side of the intermediate shaft 12. The release 26 is moved in the above direction by a push rod 27, and the push rod 27 is
It is inserted and arranged inside the intermediate shaft 12.

A substantially disk-shaped pressing body 29 is attached to the outer periphery of the release 26 via a bearing 28. This pressing body 29 is
It is adapted to rotate integrally with the clutch member 23.
The pressing body 29 is connected to the clutch plate 24 via a diaphragm spring 30 arranged on the outer peripheral surface at one end thereof.
,, 25 are pressed against each other in the direction of frictional engagement,
By this pressing, the clutch plates 24, ..., 25 are pressed against each other.

The clutch member 23 includes a boss portion 31 directly connected to one end portion of the intermediate shaft 12 by spline engagement, and the boss portion 3
1. An annular driven portion 32 arranged coaxially on the outside in the radial direction of 1.
It is divided into and. The driven side clutch plates 25 are supported on the outer peripheral portion of the driven portion 32. The driven portion 32 has an inner peripheral portion that faces the boss portion 31, and the inner peripheral portion has a clutch support portion 33 having a substantially short cylindrical shape.
Are arranged. The clutch support portion 33 has the rivet 3
It is fixed to the driven part 32 via 4 and the driven part 3
It is designed to rotate together with 2. The clutch support portion 33 is interposed between the driven portion 32 and the boss portion 31, and between the clutch support portion 33 and the boss portion 31,
A one-way clutch 35 that only transmits power from the clutch housing 22 side toward the boss portion 31 is interposed. Therefore, the driven portion 32 including the clutch support portion 33 is connected to the boss portion 31 via the one-way clutch 35.

Further, a contact portion 36 that slidably contacts the outer periphery of the boss portion 31 is provided at a portion of the clutch support portion 33 that faces the outer periphery of the boss portion 31. The contact surfaces 37 and 38 of the contact portion 36 and the boss portion 31 are tapered inclined surfaces that are tapered toward the pressing body 29 side. These contact surfaces 37 and 38 are connected to the one-way clutch 35.
It is arranged closer to the driven shaft 12 than the driven shaft 12.

The clutch support portion 33 is pressed and biased by a disc spring 39 as a spring member in a direction in which the contact surfaces 37 and 38 are frictionally engaged with each other. At this time, due to the wedge action due to the inclination of the contact surfaces 37, 38, frictional pressure contact force is generated between the contact surfaces 37, 38, and power is transmitted between the contact surfaces 37, 38. There is. In this case, the contact surface 3
Friction pressure contact force between the clutch plates 24, ...
The frictional force generated between the contact surfaces 37, 38 is smaller than that between the clutch plates 24, 25.
The power transmission capacity between the two is low.

According to this structure, normally, the diaphragm plates 30 press the clutch plates 24, 25, 25 together, and the boss portion 31 and the clutch support portion 33.
Since a one-way clutch 35 that enables power transmission from the clutch housing 22 side is interposed between the clutch housing 22 and the clutch housing 22, the rotational force transmitted from the crankshaft 11 to the clutch housing 22 is transmitted to the clutch plates 24 ,. 25 is transmitted to the clutch support portion 33. Then, this rotational force is transmitted from the clutch support portion 33 to the boss portion 31 through the one-way clutch 35, whereby the intermediate shaft 12 is rotationally driven.

In this case, the clutch support portion 33 not only makes frictional contact with the contact surface 38 of the boss portion 31, but also via the one-way clutch 35 that only transmits power to the boss portion 31 from the clutch housing 22 toward the boss portion 31. Are linked together. Therefore, from the clutch housing 22 to the intermediate shaft 12
When the rotational force is transmitted to the clutch support portion 33, the clutch support portion 33 is rotated integrally with the boss portion 31, and all the rotational force is transmitted to the boss portion 31 through the one-way clutch 35, and the contact surfaces 37, 38. There is no slippage between.

Therefore, the transmission of the rotational force to the intermediate shaft 12 is not hindered, and the intermediate shaft 12 can be reliably driven.

On the other hand, when the rotational force is being transmitted from the clutch housing 22 to the intermediate shaft 12 as described above, if an excessive reverse load is applied from the intermediate shaft 12 side due to, for example, abrupt engine braking, the rotational speed of the boss portion 31 will increase. The rotation speed of the clutch housing 22 is exceeded. In this case, since the one-way clutch 35 is interposed between the boss portion 31 and the clutch support portion 33, the one-way clutch 35 does not transmit the reverse load to the clutch support portion 33 and the reverse load Most of them try to reach the clutch support 33 through the contact surfaces 37 and 38.

However, according to the above configuration, the frictional pressure contact force generated between the contact surfaces 37, 38 is set to be smaller than the frictional force between the clutch plates 24, ..., 25, and the capacity for power transmission is the clutch plates 24. , 25 ..., the slip is generated between the contact surfaces 37, 38, and the reverse load transmitted to the clutch support portion 33 is absorbed and relaxed by the slip. Therefore, when a reverse load is applied, the rotational force (load) is transmitted to the driven portion 32 side including the clutch support portion 33 in a reduced state, and the reverse load from the intermediate shaft 12 is directly transmitted to the crankshaft 11 side. Therefore, it is possible to prevent the engine 2 from being adversely affected.

The present invention is not limited to the above embodiment. For example, the spring member that presses and biases the clutch support portion is not limited to the disc spring, and a coil spring may be used.

A coil spring may be used instead of the diaphragm spring that biases the pressing body.

According to the present invention described in detail above, when an excessive reverse load is applied from the driven shaft side, slippage occurs between the boss portion of the clutch member and the driven portion including the clutch support portion, so this reverse load is applied to the clutch housing. Can be absorbed at a stage before being transmitted to the drive source, and the adverse effect on the drive source side can be prevented.

Moreover, in this case, since the reverse load is absorbed and relaxed before it is transmitted to the clutch plate, it is not necessary to forcibly slide the clutch plate, and early wear of the clutch plate can be prevented.

Further, according to the present invention, the driven portion including the clutch support portion is a one-way clutch that not only makes frictional contact with the contact surface of the boss portion but also only transmits power to the boss portion from the clutch housing toward the boss portion. Are connected through. Therefore, when the rotational force is transmitted from the clutch housing to the driven shaft, the driven portion is rotated together with the boss portion, and all the rotational force is transmitted to the boss portion through the one-way clutch, and the contact surface There will be no slippage. Therefore, despite the structure capable of absorbing the reverse load applied to the clutch plate as described above, the transmission of the regular rotational force from the clutch housing to the driven shaft is not hindered, and the driven shaft can be securely held. It has the advantage that it can be driven.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show one embodiment of the present invention, FIG. 1 is a side view of a motorcycle, FIG. 2 is a plan view in which an engine is partially sectioned, and FIG. 3 is a friction clutch. It is sectional drawing of an apparatus. 12 ... Driven shaft (intermediate shaft), 22 ... Clutch housing, 23 ... Clutch member, 24 ... Drive side clutch plate, 25 ... Driven side clutch plate, 29 ... Pressing body, 31 ... Boss part, 32 ... Driven part, 33 ... Clutch support portion, 35 ... One-way clutch, 37, 38 ... Contact surface, 39 ... Spring member (disc spring).

Claims (1)

[Claims] 1. A driven-side clutch plate that accommodates a clutch member connected to a driven shaft relatively rotatably in a clutch housing that is rotationally driven by power transmission from a drive source, and that rotates together with the clutch member. A friction clutch device for pressing a driving side clutch plate that rotates integrally with the clutch housing with a pressing body to transmit power by a frictional force generated between the clutch plates, wherein the clutch member is directly connected to a driven shaft. A boss portion and a clutch support portion arranged coaxially outside the boss portion, the clutch support portion facing the boss portion, and an annular driven portion connected to the driven side clutch plate. When the clutch support portion of the driven portion is connected to the boss portion via a one-way clutch that only transmits power from the drive source side toward the driven shaft. In the meanwhile, the mutually opposing portions of the boss portion and the clutch support portion are provided with contact surfaces which are tapered along the axial direction of the driven shaft and slidably contact each other. The contact surface with the support portion is biased by a spring member in a direction in which they are frictionally engaged with each other, and the friction force generated between the contact surfaces is set to be smaller than the friction force between the clutch plates. Friction clutch device.