JPS6220412B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a clutch master cylinder actuating device in which a piston actuating arm of a clutch lever, which is supported by a lever holder via a pivot, is connected to a piston of a clutch master cylinder so as to be able to push the piston actuating arm of the clutch lever. The present invention relates to a device in which the play stroke of the clutch lever is adjusted.

Generally, in a clutch master cylinder actuating device, an appropriate amount of play is provided at the joint between the clutch lever and the piston in order to ensure that the piston of the clutch master cylinder returns to the specified retraction limit when the clutch lever is released. This determines the play stroke of the clutch lever. By the way, it is preferable that this play stroke can be adjusted according to the operator's preference, but there is no such mechanism in conventional clutch master cylinder actuating devices.

SUMMARY OF THE INVENTION An object of the present invention is to provide a device with a simple structure that allows the idle stroke of the clutch lever to be easily adjusted without significantly changing the conventional structure.

In order to achieve the above object, the first invention provides an eccentric part that is integrally provided on the pivot of the clutch lever by a certain amount of eccentricity with respect to the center line of the clutch lever so as to adjust the rotational position around the center line. The eccentric part is rotatably fitted into the shaft hole of the clutch lever, and the pivot shaft is further provided with a rotation stop part that engages with a regular polygonal positioning hole provided in the lever holder, Further, the second invention provides an eccentric portion on the pivot of the clutch lever, which has a regular polygonal cross section and can be rotated around the center line by being eccentric by a certain amount with respect to the center line of the clutch lever. established in
The eccentric part is fitted into a shaft hole of the clutch lever having the same cross-sectional shape as the eccentric part.

Embodiments of the present invention will be described below with reference to the drawings.

First, starting with the embodiment of the first invention shown in FIGS. 1 to 5, a rod-shaped steering handle H of a motorcycle is equipped with a clutch master cylinder M adjacent to its left handle grip Hg.
Cylinder body 1 of this clutch master cylinder M
is a cylinder hole 2 extending substantially parallel to the operating handle H.
A piston 3 is slid into the cylinder hole 2 to define a hydraulic chamber 4 on the front side thereof, and an output port 5 that opens into the hydraulic chamber 4 is connected to the hydraulic pressure of a hydraulic clutch in the power system of the motorcycle. An oil passage connected to the cylinder is connected to it.

A return spring 6 that urges the piston 3 in the backward direction is compressed in the hydraulic chamber 4, and a stop ring 8 that supports the rear end of the piston 3 via a seat plate 7 is provided to define the backward limit of the piston 3. is locked to the inner wall of the cylinder hole.

The cylinder body 1 has an oil tank 9 on the upper side that supplies hydraulic oil to the hydraulic chamber 4, and a handle grip Hg.
A pair of upper and lower lever holders 10, 10 are integrally formed at the side ends, and the lever holder 1
0 and 10, the base of a clutch lever 11 inserted between them is pivotally supported by a pivot 12.
The clutch lever 11 has a piston actuating arm 11a facing the rear end of the piston 3 at its base.
A stopper arm 11b that can come into contact with the cylinder body 1 to define the release position of the lever 11 is integrally provided.

A bearing hole 13 substantially parallel to the pivot shaft 12 is bored in the piston operating arm 11a, and a rotor 14 is rotatably fitted into the bearing hole 13. Grease is preferably applied to the rotating surface of the rotor 14.

The rotor 14 has a horizontal hole 15, and this horizontal hole 15
One end of a push rod 17 passing through a long hole 16 provided in the piston operating arm 11a is rotatably fitted, and the other end is brought into contact with the rear end of the piston 3. This push rod 17 and cylinder hole 2
A waterproof boot 23 is stretched between the inner wall and the inner wall. The elongated hole 16 allows the push rod 17 to be connected to the rotor 14.
The contact surfaces of the push rod 17 and the piston 3 are spherical convex surfaces 18 and concave surfaces 19, respectively, to allow the push rod 17 to swing relative to the piston 3, and to allow the push rod 17 to swing relative to the piston 3. 17 is always piston 3
It is designed so that the center can be pressed.

To explain in more detail the support structure of the clutch lever 11 by the pivot shaft 12, the pivot shaft 12 is composed of a bolt having a hexagonal or other regular polygonal head 12a, and both ends thereof are connected to support holes 24 provided in the lever holders 10, 10. . , a threaded portion 12 protruding downward from the lower lever holder 10;
A nut 26 is screwed onto b, thus fixing the pivot 12 to the lever holders 10, 10. This pivot shaft 12 is integrally formed with an eccentric shaft 27 as an eccentric portion which is eccentric by a certain amount ε from the center line O of the pivot shaft 12 at an intermediate portion sandwiched between both lever holders 10, 10. It rotatably passes through the shaft hole 28 at the base of the lever 11 and rotatably supports the lever 11.

Next, to explain the operation of this embodiment, the clutch lever 11 is moved around the pivot 12 by the handle grip.
When it rotates toward the Hg side, the piston actuating arm 11a moves toward the piston 3 of the clutch master cylinder M, so this arm 11a presses the piston 3 via the rotor 14 and push rod 17, and returns it to the spring. Move forward while contracting 6. Accompanying this, hydraulic pressure is generated in the hydraulic chamber 4, and the hydraulic pressure is transmitted from the output port 5 through an oil path to a hydraulic clutch of the power system (not shown), which can be brought into a disconnected state.

During the rotation process of the clutch lever 11, the piston 3 moves linearly along the cylinder hole 2, while the piston actuating arm 11a moves along the axis 1.
Along with these movements, the rotor 14 rotates within the bearing hole 13 and the push rod 17 swings relative to the piston 3, so that the piston operating arm 11a and the piston 3
can move smoothly on their respective prescribed orbits without causing large friction between them, and as a result, the clutch lever 11 can be operated easily.

When the clutch lever 11 is released, the piston 3
is retracted to a predetermined retraction limit by the elastic force of the return spring 6, and the clutch lever 11 is accordingly rotated to a predetermined release position. In this case, in order to reliably keep the piston 3 at a predetermined retraction limit, it is necessary to provide a slight play between the push rod 17 and the piston 3, or between the stopper arm 11b and the cylinder body 1. The amount of play is adjusted as follows.

That is, by sufficiently loosening the nut 26, the regular polygon head 12a of the pivot shaft 12 is inserted into the regular polygon positioning hole 2.
5 and then rotate the pivot shaft 12. At the same time, the eccentric shaft 27 rotates eccentrically around the center line O of the pivot shaft 12.
Displaced so as to move away from or approach it,
This allows the play of the clutch lever 11 to be adjusted. In this way, after the operator has obtained the play that suits his/her preference, the regular polygonal head 12a is fitted into the regular polygonal positioning hole 25 again, and the nut 2
6 is tightened, the rotation of the pivot shaft 12 is prevented by the positioning hole 25, so that the above-mentioned play will not be disturbed.

In addition, the number of play adjustment stages is determined by the head 12a of the pivot 12.
and the number of corners of the regular polygon of the positioning hole 25.

4 and 5 show an embodiment of the second invention, in which an eccentric shaft cylinder 1 whose outer peripheral surface is a regular polygon is used as an eccentric part.
27 is fitted into the middle part of the pivot shaft 12 so as to be rotatable around its center line O, and this eccentric shaft cylinder 127 is fitted into a shaft hole 128 of the same regular polygon as the eccentric shaft cylinder 127 provided in the clutch lever 11. be done. Eccentric shaft cylinder 12
7 is eccentric by a certain amount ε with respect to the center line O of the pivot 12, and the other configurations are the same as in the previous embodiment, so similar components are given the same reference numerals in the drawings.

Therefore, if the eccentric shaft cylinder 127 is rotated by changing the fitting position between the regular polygonal eccentric shaft cylinder 128 and the regular polygonal shaft hole 128, the eccentric shaft cylinder 127 will be aligned with the center line O of the pivot shaft 12. Since the clutch lever 11 will rotate eccentrically around the
can be displaced to adjust the play of the lever 11.

In addition, when changing the fitting position between the eccentric shaft cylinder 127 and the shaft hole 128, the pivot shaft 12 is moved to the lever holder 10,
Needless to say, the clutch lever 11 must be removed from the lever holder 10 and pulled out from between the lever holders 10 and 10.

As described above, according to the first invention, the eccentric portion 27 that can be eccentric by a certain amount ε with respect to the center line O of the clutch lever 11 and adjust the rotational position around the center line O is integrated into the pivot shaft 12 of the clutch lever 11. Provided, this eccentric portion 27
is rotatably fitted into the shaft hole 28 of the clutch lever 11, and further, the pivot shaft 12 is integrally provided with a rotation stop portion 12a that engages with a regular polygonal positioning hole 25 provided in the lever holder 10. Therefore, by simply giving the eccentric portion 27 an appropriate angle of eccentric rotation around the center line O of the pivot shaft 12, the play in the connecting portion between the clutch lever 11 and the piston 3 of the clutch master cylinder M can be freely adjusted. The adjusted position is reliably held by the engagement between the detent portion 12a and the positioning hole 25, so that the play stroke of the clutch lever 11 according to the driver's preference can be easily and reliably obtained. In addition, the adjustment structure is simplified by having a part thereof also used as the pivot shaft 12 of the clutch lever 11, and costs can be reduced. It can be easily applied by only making slight changes to the surroundings.

According to the second aspect of the invention, an eccentric portion 127 having a regular polygonal cross section is provided on the pivot shaft 12 of the clutch lever 11 and is eccentric by a certain amount ε with respect to the center line O of the clutch lever 11, so that the rotational position around the center line O can be adjusted. is rotatable around the center line O, and the eccentric part 127 is fitted into the shaft hole 128 of the clutch lever 11 having the same cross-sectional shape as the eccentric part 127. By simply giving an appropriate angle of eccentric rotation around the line O, the play in the joint between the clutch lever 11 and the piston 3 of the clutch master cylinder M can be freely adjusted. The eccentric portion 127 and the shaft hole 1
28, the clutch lever 11 is securely held, and therefore the play stroke of the clutch lever 11 can be easily and reliably obtained according to the driver's preference. Further, the adjustment structure is simplified by having a part of the adjustment structure also serve as the pivot shaft 12 of the clutch lever 11, and the cost can be reduced. It can be easily applied by only making slight changes to the surroundings.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional plan view of a main part showing an embodiment of the first invention, FIGS. 2 and 3 are sectional views taken along lines - and - of FIG. 1, and FIG. 4 shows an embodiment of the second invention. A sectional view similar to Fig. 3, Fig. 5 is a - of Fig. 4.
FIG. M...Clutch master cylinder, O...Center line of axis, ε...Eccentricity, 3...Piston, 10...
... Lever holder, 11 ... Clutch lever, 11
a...Piston operating arm, 12...Pivot, 12a...
...Regular polygonal head as a rotation stopper, 24... Support hole, 25... Positioning hole, 27... Eccentric shaft as an eccentric part, 28... Shaft hole, 127... Eccentric shaft cylinder as an eccentric part , 128... shaft hole.

Claims (1)

[Claims] 1. A piston operating arm 11a of a clutch lever 11 that is pivotally supported by a lever holder 10 via a pivot 12.
is connected to the piston 3 of the clutch master cylinder M so as to be able to push it.
An eccentric part 27 that can adjust the rotational position around the clutch lever 11 is integrally provided.
The lever holder 12 is rotatably fitted into the shaft hole 28 of the lever holder 10, and furthermore, the pivot shaft 12 is integrally provided with a rotation stop portion 12a that engages with a regular polygonal positioning hole 25 provided in the lever holder 10. Clutch master cylinder actuating device. 2 Piston actuating arm 11a of clutch lever 11 pivotally supported by lever holder 10 via pivot 12
is connected to the piston 3 of the clutch master cylinder M so as to be able to push it.
An eccentric part 127 having a regular polygonal cross section that can adjust the rotational position around the center line O is provided rotatably around the center line O, and this eccentric part 127 is connected to the clutch lever 11.
An actuating device for a clutch master cylinder, characterized in that the clutch master cylinder is fitted into a shaft hole 128 having the same cross-sectional shape as the eccentric portion 127.