JPH0123880Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a master cylinder operating lever device, particularly to a master cylinder operating lever device provided on a bar handle of a motorcycle, a tricycle, etc.

[Conventional technology]

In the master cylinder attached to the bar handle, a forked lever support arm is protruded from the master cylinder into which the piston for generating hydraulic pressure is inserted, and the operating lever is attached to the forked lever support arm with a stepped support bolt. It is known that a piston cup is attached to the tip of the piston to pivot and close the relief port of the master cylinder during operation, and a return spring is provided to bias the operating lever in the backward limit direction.

In such a master cylinder, it is desirable that the gripping distance between the retracted position of the operating lever and the grip of the bar handle can be adjusted in accordance with the rider's physique and preference, and various types of these master cylinders have been developed.

For example, in the system disclosed in Japanese Utility Model Publication No. 51-25409, a lever retraction limit adjusting bolt that contacts the master cylinder is screwed onto the operating lever, and the retracting limit of the operating lever is changed by protruding and retracting the lever retracting limit adjusting bolt. However, in such a configuration, the lever retraction limit adjustment bolt and its mounting portion protrude from the operating lever, and the contact portion with the adjustment bolt protrudes from the master cylinder. As a result, the master cylinder and operating lever had to be large in size. Furthermore, since the lever retraction limit adjustment bolt is exposed and provided on the operating lever, there is a risk that it may be tampered with while parking or the like.

For this reason, the present applicant inserts a U-shaped retainer between the forked lever support arm of the master cylinder and the rotational fulcrum of the operating lever, and by adjusting the rotation of this U-shaped retainer, the operating lever can be gripped. We have developed a control lever device that allows adjustment of the distance.
However, this U-shaped retainer is fixed to the forked lever support arm by the frictional force caused by the tightening of the stepped support bolt, so if the stepped support bolt should become loosened, the operation lever will be moved by the return spring. The biasing force may cause the operating lever to rotate in the releasing direction and exceed the maximum allowable gripping distance, or the stepped support bolt may be loosened to rotate the U-shaped retainer in the operating direction and the operating lever may be rotated in the operating direction. When setting the grip width narrowly, when the piston cup is not activated,
With the relief port of the master cylinder closed, there is a risk that the maximum retraction position of the operating lever may exceed the allowable minimum gripping distance.

This invention was developed against this background.
The maximum and minimum gripping distance of the operating lever is regulated within the permissible range, and in the unlikely event that the stepped support bolt that secures the U-shaped retainer loosens and the U-shaped retainer begins to rotate. but,
In addition to regulating the maximum gripping distance of the operating lever, when the stepped support bolt is loosened and the U-shaped retainer is rotated to narrow the gripping distance of the operating lever, the piston cup is relieved when not in operation. It is an object of the present invention to provide an operating lever device for a master cylinder that can secure a port in a retracted position where it is not blocked and regulate the minimum gripping distance of the operating lever.

[Means to solve the problem]

In order to achieve the above object, the present invention pivots the operating lever to the forked lever support arm formed in the master cylinder into which the piston is inserted, with a stepped support bolt, and also connects the relief port of the master cylinder during operation. In the master cylinder, a piston cup for closing is attached to the tip of the piston, and a return spring is provided for biasing the operating lever in the backward limit direction, and a first wall and a second wall facing each other are connected by a connecting wall. A lever-shaped retainer is formed, and a first wall and a second wall of the U-shaped retainer sandwich both side surfaces perpendicular to the axis of the stepped support bolt of the rotation fulcrum portion of the operating lever, and these levers are The first wall and the second wall of the letter-shaped retainer and the rotation fulcrum of the operating lever are disposed between the first arm and the second arm of the forked lever support arm, and the stepped support bolt is connected to the stepped support bolt. The first and second arms of the forked lever support arm and the rotation fulcrum of the operating lever are inserted through the first and second walls of the U-shaped retainer to rotatably support the U-shaped retainer. The stepped support bolt is tightened to the forked lever support arm, and the stepped portion of the stepped support bolt and one of the first arm or the second arm of the forked lever support arm are tightened to tighten the stepped support bolt to the forked lever support arm. The U-shaped retainer is fixed to the forked lever support arm by holding either the first wall or the second wall of the U-shaped retainer, and the opposite master to the stepped support bolt of the rotation fulcrum of the operating lever is fixed. The cylinder side is provided with an engaging convex portion that comes into contact with the contact portion of the U-shaped retainer to restrict the backward limit of the operating lever, and the U-shaped retainer is provided with a groove bottom portion of the forked lever support arm. a first contact member that comes into contact with the control lever to limit the maximum gripping distance of the operating lever;
and a second protrusion that also comes into contact with the bottom of the groove and secures the piston cup in a retracted position that does not block the relief port when setting the minimum gripping distance of the operating lever. It is characterized by

[Effect]

Therefore, in the unlikely event that the stepped support bolt fixing the U-shaped retainer to the forked lever support arm loosens, the U-shaped retainer will rotate in the direction of releasing the operating lever relative to the forked lever support arm. When the operating lever is moved, the first protrusion comes into contact with the bottom of the groove of the forked lever support arm, restricting further rotation, thereby regulating the maximum gripping distance of the operating lever to an allowable range.

Further, in order to loosen the stepped support bolt and narrow the gripping distance of the operating lever, when the U-shaped retainer is rotated in the operating direction of the operating lever, the second
When the protrusion comes into contact with the bottom of the groove of the bifurcated lever support arm,
The rotation of the U-shaped retainer is regulated, and when the U-shaped retainer is re-fixed to the forked lever support arm in this regulated position, the piston cup is secured in the retracted position where it does not block the relief port when it is not in operation.
The minimum gripping distance of the operating lever is set within an allowable range.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

An operating lever 3 is rotatably supported on a bifurcated lever support arm 2 formed integrally with the master cylinder 1 at its pivot point 4 by a stepped support bolt 5, and is supported in the backward limit direction by a return spring 17. is energized by The rotation fulcrum portion 4 of the operating lever 3 is provided with locking convex portions 6, 6 on the side opposite to the master cylinder with respect to the stepped support bolt 5, as shown in detail in FIG. 3, for regulating the backward limit of the operating lever 3. ing.
A piston 11 having a piston cup 16 attached to its tip is inserted into the master cylinder 1, and during operation, the piston cup 16 closes the relief port 15 of the master cylinder 1 to generate hydraulic pressure.

A U-shaped retainer 7 is attached to the rotation fulcrum portion 4 of the operating lever 3 so as to hold it therein. This U-shaped retainer 7 has a first wall 7a and a second wall facing each other.
One side of the wall 7b is connected by a connecting wall 7c to form a U-shaped cross section, and the first wall 7a has a bolt insertion hole 7d, and the second wall 7b has a bolt insertion hole 7d with a smaller diameter than the bolt insertion hole 7d. Holes 7e are formed respectively. The first wall 7a and the second wall 7b have an end portion on the side opposite to the master cylinder with respect to the stepped support bolt 5.
Contact portions 7f, 7f corresponding to the engagement convex portions 6, 6 of the operating lever 3 are provided, and an end portion on the master cylinder 1 side with respect to the stepped support bolt 5 is provided with contact portions 7f, 7f corresponding to the engagement convex portions 6, 6 of the operating lever 3, and
First protrusions 7g, 7g and second protrusions 7h, 7h corresponding to the groove bottom 2c of the forked lever support arm 2 are provided.

The first protrusion 7g is formed at the groove bottom 2 of the forked lever support arm 2 when the U-shaped retainer 7 rotates in the release direction of the operating lever 3 about the stepped support bolt 5.
c, and limits the maximum gripping distance of the operating lever 3 to within a set allowable range. Further, when the U-shaped retainer 7 rotates about the stepped support bolt 5 in the operating direction of the operating lever 3, the second protrusion 7h comes into contact with the groove bottom 2c, and prevents the piston cup 16 from operating when it is not operating. , the relief port 15 is secured in a retracted position where it is not blocked, and the minimum gripping distance of the operating lever 3 is regulated within an allowable range.
When the U-shaped retainer 7 is fixed to the forked lever support arm 2, either one of the first projection 7g and the second projection 7h is brought into contact with the groove bottom 2c, or
Alternatively, both may be placed without contacting each other.

The first wall 7a and the second wall 7b of the U-shaped retainer 7 are connected to the rotation fulcrum portion 4 of the operating lever 3.
The U-shaped retainer 7 is mounted on the rotation fulcrum portion 4 of the operating lever 3 by sandwiching both side surfaces 4a and 4b perpendicular to the axis of the stepped support bolt 5.

This U-shaped retainer 7 is disposed within the forked lever support arm 2. That is, the first wall 7a of the U-shaped retainer 7 is connected to the first wall 7a of the forked lever support arm 2.
A second wall 7b is provided between the arm 2a and one side surface 4a of the pivot point 4, and between the second arm 2b of the forked lever support arm 2 and the lower side surface 4b of the pivot point 4. a first arm 2a of the forked lever support arm 2 and a first wall 7a of the U-shaped retainer 7;
the bolt insertion hole 7d of the operating lever 3, the rotation fulcrum 4 of the operating lever 3, the bolt insertion hole 7e of the U-shaped retainer 7b, and the second arm 2b of the forked lever support arm 2.
A U-shaped retainer 7 is rotatably supported by a stepped support bolt 5 inserted through the step support bolt 5, and the step portion 5a of the stepped support bolt 5 and the second arm 2b of the forked lever support arm 2 are connected to each other. The inner surface and the second wall 7 of the U-shaped retainer 7
b, and by tightening the nut 8 screwed onto the tip of the stepped support bolt 5 and tightening the stepped support bolt 5 to the forked lever support arm 2, the U-shaped retainer 7 is turned into a forked shape. Fix it to the lever support arm 2.

Note that the bolt insertion hole 7d may have a smaller diameter than the bolt insertion hole 7e, and the stepped support bolt 5 may be inserted from the second arm 2b side of the forked lever support arm 2. In this case, the first wall 7a of the U-shaped retainer 7 is connected to the stepped portion 5a of the stepped support bolt 5 and the forked lever support arm 2.
It is held between the inner surface of the first wall 2a and the inner surface of the first wall 2a.

Further, an adjustment bolt 10 is screwed into the rear end portion 12 of the piston 11 of the master cylinder 1 so as to be freely retractable.
is fixed. The rear end 10 of the adjustment bolt 10
The piston pushing portion 9 of the operating lever 3 comes into contact with a.

Therefore, in the unlikely event that the stepped support bolt 5 fixing the U-shaped retainer 7 to the forked lever support arm 2 loosens, the U-shaped retainer 7 will move the operating lever 3 against the forked lever support arm 2. Even if it rotates in the release direction (counterclockwise in Figure 1),
Since the first protrusions 7g, 7g abut against the groove bottom 2c of the forked lever support arm 2, the maximum gripping distance of the operating lever 3 is regulated within an allowable range. Furthermore, when loosening the stepped support bolt 5 to narrow the gripping distance of the operating lever 3, it is also possible to rotate the U-shaped retainer 7 in the operating direction of the operating lever 3 (clockwise in FIG. 1). , since the second protrusions 7h, 7h abut against the groove bottom 2c, the piston cup 16 is secured in a retracted position that does not block the relief port 15 when not in operation, and the minimum gripping distance of the operating lever 3 is within the allowable range. Regulated.

[Effect of idea]

As described above, in the present invention, a U-shaped retainer rotatably disposed between the forked lever support arm of the master cylinder and the rotational fulcrum of the operating lever is connected to the forked shape using a stepped support bolt. The U-shaped retainer is fixed to the lever support arm, and the U-shaped retainer regulates the retraction limit of the operating lever, and the U-shaped retainer is in contact with the bottom of the groove of the forked lever support arm to limit the maximum gripping distance of the operating lever. and a second protrusion that also comes into contact with the bottom of the groove and secures the piston cup in a retracted position that does not block the relief port when it is not in operation, when setting the minimum gripping distance of the operating lever. , so even if the stepped support bolts loosen and the U-shaped retainer rotates, the maximum allowable gripping margin can be secured, and the stepped support bolts can be loosened to rotate the U-shaped retainer. In this way, even when setting the minimum gripping distance of the operating lever, the piston cup is secured at a retracted position where it does not block the relief port when not in operation, and the minimum allowable gripping distance can be set.

Furthermore, compared to the conventional lever retraction limit adjustment bolt that is exposed and provided on the operating lever, the present invention provides a U-shaped retainer for lever retraction limit adjustment within the forked lever support arm, making the device easier to use. It can be made smaller and there is no risk of it being tampered with.

[Brief explanation of the drawing]

Figure 1 is a front view showing the entire device of the present invention;
The figure is a detailed view showing the relationship between the bifurcated lever support arm and the retainer.
The figure is a cross-sectional view taken from FIG. 1, and FIG. 5 is a perspective view of the retainer. DESCRIPTION OF SYMBOLS 1... Master cylinder, 2... Forked lever support arm, 2a... First arm, 2b... Second arm, 2c...
...Groove bottom, 3...Operation lever, 4...Rotation fulcrum, 5...Stepped support bolt, 6...Lock protrusion, 7
...U-shaped retainer, 7a...first wall, 7b...
2nd wall, 7c... Connection wall, 7f... Contact part, 7g
...First protrusion, 7h...Second protrusion, 15...Relief port, 16...Piston cup.

Claims (1)

[Scope of utility model registration request] An operating lever 3 is pivotally supported by a stepped support bolt 5 on a forked lever support arm 2 formed on a master cylinder 1 into which a piston 11 is inserted, and a piston cup that closes a relief port 15 of the master cylinder 1 during operation. 16 is attached to the tip of the piston 11, and is provided with a return spring 17 that biases the operating lever 3 in the backward limit direction.In the master cylinder, a connecting wall 7c connects the opposing first wall 7a and second wall 7b. Connect with U-shaped retainer 7
The first wall 7a and the second wall 7b of the U-shaped retainer 7 form both side surfaces 4 of the rotation fulcrum portion 4 of the operation lever 3 perpendicular to the axis of the stepped support bolt 5.
a and 4b, and connect the first wall 7a and second wall 7b of the U-shaped retainer 7 and the rotation fulcrum portion 4 of the operating lever 3 to the first wall of the forked lever support arm 2.
The stepped support bolt 5 is disposed between the arm 2a and the second arm 2b, and the stepped support bolt 5 is connected to the first arm 2 of the forked lever support arm 2.
The U-shaped retainer 7 is rotatably supported by being inserted through the first wall 7a and the second wall 7b of the U-shaped retainer together with the second arm 2b and the rotation fulcrum portion 4 of the operating lever 3. The stepped support bolt 5 is tightened to the forked lever support arm 2, and the step portion 5a of the stepped support bolt 5 and the first part of the forked lever support arm 2 are tightened.
Either the first wall 7a or the second wall 7b of the U-shaped retainer 7 is held between the arm 2a or the second arm 2b, and the U-shaped retainer 7 is attached to the forked lever support arm 2. The U-shaped retainer 7 is fixed to the rotation fulcrum portion 4 of the operation lever 3 on the side opposite to the master cylinder with respect to the stepped support bolt 5.
An engaging convex portion 6 is provided which abuts against the abutting portion 7f of the control lever 3 to restrict the backward limit of the operating lever 3, and the U-shaped retainer 7 abuts the groove bottom portion 2c of the forked lever support arm 2. The first protrusion 7g that regulates the maximum gripping distance of the operating lever 3 and the operating lever 3
When setting the minimum gripping distance, second protrusions 7h are provided, which also come into contact with the groove bottom 2c and secure the piston cup 16 in a retracted position that does not block the relief port 15. Master cylinder operating lever device.