JPS59197625A - Clutch operating mechanism in motorcycle - Google Patents

Abstract

PURPOSE:To miniaturize a clutch having a capacity increased by a strong urging spring, and as well to make the release of the clutch smooth, by operating the clutch with the use of a hydraulic drive. CONSTITUTION:A hydraulic drive mechanism 13 is disposed between a release drive mechanism 9 and the tail end of a pushrod 7. When a clutch lever is pulled to operate the release mechanism 9, a piston valve 16 comes in contact with a push piston 15 to press the latter so that the operation becomes heavy. However, at this stage a hydraulic input 19 opens but a hydraulic output 20 closes, and therefore, a hydraulic pressure Wb which is regulated at a constant value by a relief valve 22 is applied to the piston 15. Since the force Wa of a clutch spring 5 is larger than Wb, the piston 15 does not move, but if a force Wc is continuously added from the mechanism 9 so that the resulted force exceeds Wa, the piston rod 15 pushes the pushrod 7 to release the clutch mechanism 1.

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, the clutches of two-wheeled motor vehicles, which are always engaged by a pressing spring, are always engaged by a suppressing spring and released by a clutch lever when changing gears. In large two-wheeled motor vehicles, it is necessary to increase the clutch capacity accordingly, but there is a limit to how much the pressing force of the pressing spring can be increased for this purpose. That is,
This is because manual operating force of the clutch lever cannot be forced, and when the lever ratio is increased, the operating stroke increases, which may even cause inconvenience. Therefore, the clutch capacity is increased by increasing the number of multi-disc clutches, and the force of the suppression spring is kept at an appropriate level. The disadvantages of this method are that it causes problems with clutch disengagement, increases the width of the engine, and increases costs. In view of these shortcomings, the clutch capacity was increased by strengthening the suppression spring without increasing the number of clutch plates, and in addition, the operating stroke and operating force of the clutch Leno ζ- were appropriately suppressed to enable sensitive control of this clutch. The present invention aims to provide a clutch operating device for a two-wheeled motor vehicle.

In order to achieve the above object, the clutch operating device for a two-wheeled motor vehicle according to the present invention also uses a hydraulic drive mechanism.

In other words, the movable release member for opening the clutch, which is always connected by a pressing spring, is provided with a hydraulic drive mechanism for hydraulic pressure weaker than the elasticity of the pressing spring, while the release driving mechanism by the manual clutch lever and the movable A play stroke is provided between the member and the movable member, and this play stroke controls the valve device of the hydraulic drive mechanism, and the hydraulic drive mechanism is driven at the same time as the release drive mechanism engages the movable member. to start.

With this configuration, when the manual Kujich lever is slightly operated to exceed the amount of play, the hydraulic drive mechanism is activated, and the manual operating force and hydraulic pressure work together to act on the clutch. The hydraulic pressure is constant, and the clutch can be controlled at will by increasing or decreasing the manual operating force by subtracting that amount. Also, since the hydraulic pressure is weaker than the suppression spring, if the operating force is weakened, the clutch will immediately return to engagement. In this case as well, the amount of torque transmitted in the half-clutch state can be controlled according to the adjustment of the operating force, and when the release drive mechanism separates from the movable member, the hydraulic pressure stops and the state returns to the full clutch state.

As described above, by using the clutch operating device for a two-wheeled motor vehicle according to the present invention, a considerably large force can be controlled by a force adapted to manual operation, so the number of clutch plates can be reduced by increasing the size of the suppression spring. Therefore, the clutch can be easily disengaged, and the engine width can be made more compact to reduce weight, which helps reduce costs. The hydraulic drive mechanism only needs to obtain a constant hydraulic pressure, and the valve device only needs to have a simple function of opening and closing, so unlike a mechanism that controls hydraulic pressure, it has a simple structure and is easy to install. It is particularly suitable as a clutch operating device for two-wheeled motor vehicles that require a large and large-capacity clutch.

Next, embodiments of the invention will be described with reference to the drawings.

FIG. 1 illustrates a clutch mechanism and a release mechanism of a two-wheeled motor vehicle. The clutch mechanism 1 is equipped at the end of a shaft 2, has a driving friction plate 3 and a driven friction plate 4 stacked on each other, and is pressed by a bushing plate 6 elastically loaded with a clutch spring 5.
Always connected. A bushing rod 7 is slidably inserted into the axis of the shaft 2, and its tip engages with the center of the bushing plate 6 via a bushing pin 8. When the bushing rod 7 is pushed, the bushing plate 6 moves away from the friction plate against the clutch spring 5, and the clutch mechanism 1 is released. A release drive mechanism 9 is provided on the opposite side of the shaft 20. This release drive mechanism 9 is fixed to a case or the like, and has a bushing screw 11 screwed into an internal thread 10. The bushing screw 11 is swung by a lever 12 that is linked to a clutch lever ζ-, and its axial displacement causes the release. Drive the member.

Next, the release drive unit 'W#9 and the push rod r7
A hydraulic drive mechanism 13 is interposed between the tail ends of the hydraulic drive mechanism 13 .

A cylinder 14 is provided concentrically with the shaft 2, and the tip of a two-stone rod 15a of a bushing piston 15 housed in the cylinder 14 is brought into contact with the tail end of the bushing rod 7. A piston valve 16 is housed in the cylinder 14 behind the bush piston 15. The gusset valve 16 is urged rearward by the return spring 17, and the bushing member 18'i<
Through the bushing screw 1 of the release drive mechanism 9
1 Touching the tip. Piston valve 1 in this retracted position
A hydraulic inlet 19 opens into the cylinder 14 at the rear end of the bushing 6, while a hydraulic outlet opens at the tail end of the bushing stone 15. The gas cylinder valve 16 has a communication hole 2 that communicates with the front and rear.
There is 1. Further, the cylinder 14 is provided with a relief valve η, and its pressure spring η controls the cylinder internal pressure to a constant level. The magnitude of the oil pressure is set so that the pressing force wb generated on the bushing piston 15 does not exceed the force Wa of the clutch spring 5.

The above configuration works as follows.

When the clutch lever is pulled and the release drive mechanism 9f is activated, the pistol valve 16 presses the return spring 17 and moves forward. The operating force at this time is extremely light. The piston valve 16 comes into contact with the bush piston 15 and presses it, making operation difficult. At this time, the hydraulic inlet 19 is opened, the hydraulic pressure output is closed (FIG. 2), and the hydraulic pressure wb, which is controlled at a constant level by the relief valve U, is applied to the bush piston 15. clutch spring 5
Since 0 force Wa>wb, the bushing piston 15 does not move, but the piston valve 16 continues to be released from the release drive mechanism 9.
A force Wc is added to the , which becomes larger and becomes Wa(W
When b+We is reached, the bushing piston 15 pushes out the bushing rod 7 and the clutch mechanism 1 opens.

Since Wa and 'Wb are constant, the above operation is controlled by Wc, that is, manual operating force, and can be controlled as desired by adjusting the manual operation force, and even when loosening the force and engaging the clutch, it can be operated as desired in a freely half-clutch state. .

The valve for controlling the hydraulic pressure is limited to the piston valve shown in the figure; however, any valve that is controlled by the release drive mechanism can be used as appropriate and can be installed anywhere. A solenoid valve may also be used.

As shown in the embodiments above, the clutch operating device for a motorcycle according to the present invention reduces manual operating force by assisting with hydraulic pressure, and increases the force of the through clutch spring. This reduces the number of friction plates required, resulting in sharper cutting, which helps reduce the weight and cost of the engine.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing a clutch mechanism of a two-wheeled motor vehicle equipped with the device of the present invention, and FIGS. 2 and 3 are longitudinal sectional side views of the hydraulic drive mechanism similarly showing the operating state. 1...Clutch mechanism, 5...Clutch spring,
7... Bush rod, 9... Release drive mechanism,
13... Hydraulic drive mechanism, 14... Cylinder, 15.
... Bush piston, 16 ... Piston valve, 1
7...Return spring, 19...Hydraulic pressure inlet, Addition...Hydraulic pressure outlet, n...Relief valve.

Claims (1)

[Claims] In a clutch mechanism that is always connected by a pressure spring and released by operating a release mechanism when necessary, a return spring is interposed between a movable release member and a manual release drive mechanism to set a play stroke. , a hydraulic drive mechanism regulated to a hydraulic pressure smaller than the force of the suppression spring acts on the movable release member, and a valve device that controls the hydraulic drive mechanism is linked to the free stroke of the release drive mechanism to create a release drive mechanism. A clutch operating device for a two-wheeled motor vehicle, characterized in that the hydraulic drive mechanism starts driving at the same time as the movable release member engages with the release movable member.