JPS6329645Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an operating lever device for a master cylinder.

Conventionally, it has been desirable to be able to adjust the release position of the control lever, i.e., the gripping distance, and the amount of play, i.e., the amount of play until the brake is applied, according to the rider's preference, and various lever devices that can do this have been developed, but all of them are It has drawbacks such as not being able to adjust both the open position and the play of the operating lever, and furthermore, the adjustment work is troublesome.

This invention was developed against this background.
In a master cylinder in which an operating lever is pivotally supported by a support bolt to a forked lever support arm formed in the master cylinder, a U-shaped retainer that holds the rotational fulcrum of the operating lever is disposed within the forked lever support arm. A U-shaped retainer is sandwiched and fixed between the stepped portion of the support bolt and the forked lever support arm so that the position can be changed, and a locking protrusion that comes into contact with the end of the U-shaped retainer when the operating lever is returned. The control lever is formed into an operating lever, an adjusting bolt is screwed onto the piston of a master cylinder, and the operating lever and the piston of the master cylinder are connected via the adjusting bolt. To provide an operating lever device for a master cylinder that can easily adjust both the gripping distance and free play of the operating lever by adjusting a retainer and combining an adjusting bolt.

Examples will be described below based on the drawings.

A rotation fulcrum portion 4 of an operating lever 3 is rotatably supported by a stepped pin 5 on a bifurcated lever support arm 2 integrally formed with the master cylinder 1.
is provided with locking protrusions 6, 6 as shown in detail in FIG.

A U-shaped retainer 7 is attached to the rotation fulcrum portion 4 of the forked lever support arm 2 so as to be held therewith, and this retainer 7 is disposed within the forked lever support arm 2. This U-shaped retainer 7 has an upper side 7a inserted between the upper arm 2a of the forked lever support arm 2 and the upper surface 4a of the rotation fulcrum 4, and a lower arm 2b of the support arm 2 and the upper surface 4a of the rotation fulcrum 4. The lower side 7b inserted between the lower surface 4b and the lower side 7b are connected by a vertical wall 7c to form a U-shaped cross section, and the pin insertion hole 7d is formed in the upper side 7a.
and a pin insertion hole 7e formed on the lower side 7b, this pin insertion hole 7e is formed with a smaller diameter than the pin insertion hole 7d, and corresponds to the locking convex portions 6, 6 near the rotation fulcrum portion 4. The lower side 7b of the U-shaped retainer is formed by the stepped portion 5a of the stepped pin 5, which has contact portions 7f and 7f and is inserted into the pin insertion holes 7d and 7e, and the inner surface of the lower arm 2b of the forked lever support arm 2. Natsuto 8
By tightening, it is fixed to the forked lever support arm 2.

A contact portion 9 formed on the operating lever 3 has a rear end portion 12 of a piston 11 of a master cylinder 1, which will be described later.
It is connected to an adjustment bolt 10 provided in the.

As shown in detail in FIG. 2, the adjustment bolt 10 is telescopically screwed into the piston rear end 12 of the master cylinder 1 and fixed to the piston rear end 12 by a nut 13. and adjustment bolt 10
The distal end portion 10d is connected to the contact portion 9 of the operating lever 3 as described above.

When the operating lever 3 is operated in the operating direction, the abutting portion 9 of the operating lever 3 is moved against the adjusting bolt 1.
0, the piston 11
moves, the piston cup 16 closes the passage relief port 15 with the reservoir 14, and the hydraulic chamber 17 is closed.
A high pressure is generated at the wheel cylinder, and the high pressure is supplied to a wheel cylinder (not shown) to perform a braking action.

When the brake is released, the operation lever 3 is loosened, and the piston 11 is returned to its original position by the return spring 18, and the operation lever 3 is returned to the open position by the compression spring 19, and the brake is released.

Next, the operation of the present invention will be explained. U-shaped retainer 7 inserted into the rotation fulcrum portion 4 of the operating lever 3
Loosen the nut 8 and rotate it appropriately to remove the retainer 7.
By changing the contact position between the contact parts 7f, 7f of the rotary fulcrum part 4 and the locking protrusions 6, 6 of the rotation fulcrum part 4, the release position of the operating lever 3, that is, the gripping distance can be adjusted according to the rider's preference. .

When the gripping allowance is shortened, the piston 11 moves toward the relief port 15 due to the above adjustment, so there is a risk that the piston cup 16 will close it.To prevent this, loosen the nut 13 of the adjustment bolt 10, It is sufficient to screw in the adjustment bolt 10 by an amount corresponding to the adjustment in step 3.

Furthermore, by adjusting the adjustment bolt 10, the amount of movement from the start of movement of the piston cup 16 to the closing of the relief port 15, that is, the amount of play can be adjusted without affecting the gripping amount.

As described above, the present invention is a combination of a retainer that is fixed so that the position can be changed between the forked lever support arm of the master cylinder and the rotational fulcrum of the operating lever, and an adjustment bolt that is screwed onto the piston of the master cylinder. Therefore, both the release position of the operating lever, that is, the gripping distance, and the hydraulic pressurization position of the operating lever, that is, the play amount, can be freely adjusted. In addition, since the U-shaped retainer is clamped and fixed between the stepped portion of the support bolt and the forked lever support arm so that its position can be changed, the support bolt can have both the function of a rotation fulcrum for the operating lever and the function of positioning the retainer. Moreover, the support bolt and the U-shaped retainer have the effect of making it possible to adjust the gripping distance without increasing the size of the operating lever.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a front view showing the whole, Fig. 2 is a cross-sectional view of Fig. 1, and Fig. 3 is a cross-sectional view of Fig. 1.
The figure is a cross-sectional view taken from FIG. 1, and FIG. 4 is a perspective view of the retainer. 1 is a master cylinder, 2 is a bifurcated lever support arm, 2a is an upper arm, 2b is a lower arm, 3 is an operating lever,
4 is a rotation fulcrum part, 5 is a stepped pin, 6 is a locking convex part,
7 is a retainer, 7a is an upper side, 7b is a lower side, 7c is a vertical wall, 7d and 7e are pin insertion holes, 7f is a contact part,
8 is a nut, 10 is an adjustment bolt, 11 is a piston, and 13 is a nut.

Claims (1)

[Scope of utility model registration request] In a master cylinder in which an operating lever is pivotally supported by a support bolt to a forked lever support arm formed in the master cylinder, a U-shaped retainer that holds the rotational fulcrum of the operating lever is disposed within the forked lever support arm. A U-shaped retainer is sandwiched and fixed between the stepped portion of the support bolt and the forked lever support arm so that the position can be changed, and a locking protrusion that comes into contact with the end of the U-shaped retainer when the operating lever is returned. An operating lever device for a master cylinder, characterized in that the operating lever is formed into an operating lever, an adjusting bolt is screwed onto the piston of the master cylinder, and the operating lever and the piston of the master cylinder are connected via the adjusting bolt.