JPH039513Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an operating lever for a master cylinder used in a clutch device or a brake device of a motorcycle or the like.

[Conventional technology]

The operating lever of this type of master cylinder is rotatably supported on the lever mounting part of the cylinder body, and the rotation of the pressing part pushes the protruding end of the piston that is movably inserted into the cylinder body in a fluid-tight manner. It is designed to supply pressurized fluid in the cylinder to the brake device or clutch device, and is biased in the non-operating direction by a return spring compressed between the cylinder body and the cylinder body. The movement position is controlled by a stopper that extends in the opposite direction of the rotational fulcrum from the pressing portion and comes into contact with the cylinder body.

[Problem that the invention attempts to solve]

However, as this operating lever is assembled into the master cylinder, the position of the lever mounting part of the cylinder body and the rotation center of the operating lever, the position of the stopper that contacts the cylinder body, and the position of the piston inserted into the cylinder body must be adjusted. Due to the accumulation of manufacturing errors, such as the mounting position of the retraction limit member such as a circlip that comes into contact and restricts the retraction limit of the piston, and the position of the pressing part that pushes the protruding end of the piston, the pressing part slightly pushes the piston. The operating lever is assembled,
A gap may occur between the retraction limit member such as a circlip and the flange of the piston, resulting in a change in the positional relationship between the primary cup at the tip of the piston and the relief port, or a gap between the protruding end of the piston and the pressing part. There was a problem that the piston was assembled inconsistently and the invalid stroke of the piston became large.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a master cylinder operating lever that maintains a constant positional relationship between the piston and the pressing portion of the operating lever during assembly and reduces invalid strokes.

[Means for solving problems]

In order to solve the above object, the present invention is rotatably supported by the cylinder body, and the protruding end of the piston fitted into the cylinder body is pushed by a pressing part, and the piston is compressed between the piston and the cylinder body. In the operating lever of the master cylinder, which is biased in the non-operating direction by a return spring, the engagement lever engages with the protrusion of the piston when the operating lever is released, and restricts rotation of the operating lever in the non-operating direction. The present invention is characterized in that a stop arm is formed near the pressing portion.

[Effect]

Thereby, the positional relationship between the protruding end of the piston and the pressing portion of the operating lever becomes constant.

〔Example〕

An embodiment of the present invention will be described based on the drawings.

A piston 4 is movably inserted in a liquid-tight manner into a cylinder 3 of a cylinder body 2 of a master cylinder 1 attached to a handlebar (not shown), and is urged in the return direction by a return spring 5.
The rear flange 4a of the piston is brought into contact with the circlip 6 so that the piston is placed in a certain retracted position, and an adjuster bolt 7 is screwed onto the rear portion 4b of the piston, which protrudes from the open end of the cylinder 3.

Then, the lever mounting portion 2a of the cylinder body 2
The operation lever 8 is rotatably supported by inserting a support bolt 9 into the rotation fulcrum part 8a, and is moved in the non-operating direction by a return spring 10 compressed between the cylinder body 2 and the operation lever 8. energized.

This operating lever 8 has a grip portion 8b and a grip portion 8b.
When pulled in the operating direction, the pressing part 8 rotates clockwise in the figure and comes into contact with the upper surface 7b of the head 7a of the adjusting bolt 7 to push the piston 4.
c and is formed in a forked shape closer to the cylinder body 2 than the pressing part 8c, and when the operation lever 8 is released, it engages with the lower surface 7c of the head 7a of the adjustment bolt 7 and moves the operation lever 8 in the non-operating direction. A locking arm 8d that restricts rotation is integrally formed.

This locking arm 8d is connected to the lower surface 7a of the head 7a of the adjusting bolt 7 when the pressing portion 8c pushes the piston 4.
The piston 4 is disengaged from the piston 4 so as not to impede the forward movement of the piston 4.

With this configuration, the operating lever 8
When the piston 4 in the cylinder 3 is biased by the return spring 5 when the operation is released, and the rear flange 4a contacts the circlip 6 to restrict the backward limit, the locking arm 8d of the operating lever 8 adjusts. It engages with the lower surface 7c of the head 7a of the bolt 7 to restrict rotation of the operating lever 8 in the non-operating direction.

Therefore, the piston 4 retreats until the rear flange 4a contacts the circlip 6, so the positional relationship between the primary cup 11 at the tip of the piston 4 and the relief port (not shown) does not change, and the invalid stroke is reduced. It never gets bigger.

In addition, the pressing portion 8c of the operating lever 8 and the locking arm 8d
The distance between the upper surface 7b and the lower surface 7c of the head 7a of the adjusting bolt 7 may be formed based on the thickness of the upper surface 7b and the lower surface 7c of the head 7a of the adjusting bolt 7, so 8c can be reduced, and fluctuations in the amount of play of the operating lever 8 can be suppressed.

Furthermore, by adjusting the adjustment bolt 7, the gripping distance of the operating lever 8 can be easily changed.

[Effect of idea]

As described above, the present invention is rotatably supported by the cylinder body, the protruding end of the piston fitted in the cylinder body is pushed by the pressing part, and the return spring is compressed between the piston and the cylinder body. In the operating lever of the master cylinder which is biased in the non-operating direction, the locking arm engages with the protrusion of the piston to restrict rotation of the operating lever in the non-operating direction when the operating lever is released. Since it is formed near the pressing part, when the operating lever is assembled to the cylinder body, the piston can be moved back until it comes into contact with the circlip, making it easy to set the distance between the circlip installation position and the relief port. Ineffective strokes can be reduced, and
By keeping the positional relationship between the pressing portion of the operating lever and the protruding end of the piston constant, fluctuations in the amount of play of the operating lever can be suppressed.

[Brief explanation of the drawing]

The figure is a cutaway plan view showing one embodiment of the present invention. 1... Master cylinder, 2... Cylinder body, 3... Cylinder, 4... Piston, 4a...
Flange at the rear of the piston, 4b...Protruding end of the piston, 6...Circlip, 7...Adjustment bolt, 8...Operation lever, 8a...Rotation fulcrum part,
8b...grip part, 8c...pressing part, 8d...locking arm, 10...return spring.

Claims (1)

[Scope of utility model registration request] The protruding end of the piston, which is rotatably supported by the cylinder body and fitted into the cylinder body, is pushed by the pressing part, and is biased in the non-operating direction by the return spring compressed between it and the cylinder body. In the operating lever of the master cylinder, a locking arm is formed in the vicinity of the pressing part to engage the protruding part of the piston to restrict rotation of the operating lever in the non-operating direction when the operating lever is released. A master cylinder operating lever featuring: