JPH0117516Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a master cylinder that is attached to a bar handle of a motorcycle or the like.

[Conventional technology]

Conventionally, in order to attach a master cylinder used for a brake device or clutch device to a bar handle of a motorcycle, etc., a pair of mounting bolts are used, with the bar handle being sandwiched between a handle mounting part formed integrally with the master cylinder and a separate mounting member. However, since the mounting surface of the bar handle is circular, it took time and effort to position the bar handle during installation.

In addition, when the piston, which is inserted into the cylinder and moves forward in the cylinder to supply pressurized fluid by rotating the control lever, moves back in the cylinder by releasing the operation of the control lever, the position is restricted by the cylinder. Since this was done by fitting and locking a stopper member such as a circlip inside, the assembly work was time-consuming.

[Purpose of invention]

The present invention has been developed in view of the above points, and an object of the present invention is to provide a master cylinder that facilitates the installation of the master cylinder and also allows the position of the piston to be regulated in the backward direction at the same time.

[Structure of the idea]

In order to achieve the above object, the present invention provides a master cylinder that is attached to a bar handle and generates hydraulic pressure by advancing a piston that is mounted in a cylinder so as to be movable in a liquid-tight manner by rotating an operating lever. The bar handle is held between the master cylinder's body mounting part and the mounting member, one mounting bolt is inserted into the insertion hole drilled in the mounting member and the bar handle, and is screwed into the vehicle body mounting part. It is characterized by having the tip of the bolt protrude into the cylinder to restrict the retraction limit of the piston.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 to 3.

The master cylinder 1 includes a reservoir 2 filled with hydraulic fluid, an operating lever 4 attached to an operating lever mounting part 3, and a cylinder 6 into which a piston 5 is inserted, which moves forward by being pushed by the operating end 4a of the operating lever 4.
and a vehicle body attachment part 8 attached to the bar handle 7.

The vehicle body mounting portion 8 is provided with a bolt mounting hole 9 having a female thread, and a piston stopper insertion hole 10 is bored into the cylinder 6 from the tip thereof.

The mounting bolt 11 has male threaded portions 11a, 1 at both ends.
1b, a piston stopper portion 11c is formed at the tip of the male threaded portion 11a at one end, and a notch 11d into which the mounting bolt 11 is screwed is formed at the other end 11b.

To attach the master cylinder 1 to the bar handle 7, the bar handle 7 is sandwiched between the vehicle body mounting part 8 and the mounting member 12, and the mounting bolts 11 are inserted into the mounting holes 12a and 7a drilled in the mounting member 12 and the bar handle 7. Then, after screwing the mounting bolt 11 into the bolt mounting hole 9 by applying a screwdriver or the like to the notch 11d, a nut 14 is screwed into the male threaded portion 11b of the mounting bolt 11 via the washer 13 and fastened.

By this mounting operation, the piston stopper portion 11c of the mounting bolt 11 protrudes into the cylinder 6 from the piston stopper insertion hole 10.

Inside the cylinder 6 are piston cups 5a and 5b.
A piston 5 having a piston 5 is movably inserted in a fluid-tight manner, and is always urged in the backward direction by a return spring 15, and when the operating lever 4 is actuated, the piston 5 moves forward to supply pressurized fluid. , when the operation of the operating lever 4 is released, the return spring 15
The piston 5 moves backward due to the urging force of the piston 5, but since the piston stopper portion 11c protrudes to its backward limit, the piston 5 stops and its position in the backward direction is restricted.

[Effect of idea]

As described above, the present invention includes a bar handle that is sandwiched between the vehicle body mounting part of the master cylinder and the mounting member, and
The mounting bolt was inserted into the insertion hole drilled in the mounting member and the bar handle and screwed into the vehicle body mounting part, and the tip of the mounting bolt was made to protrude into the cylinder to restrict the retraction limit of the piston.
It is easier to determine the mounting position of the master cylinder, and there is no need to fit parts that restrict the retraction limit of the piston as in the past, so the number of parts is reduced.
Assembly work is also easier.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a partially sectional plan view showing the state in which the master cylinder is installed, Fig. 2 is a partially sectional side view, and Fig. 3 is a - cross section of Fig. 1. It is a diagram. 1 is the master cylinder, 2 is the reservoir, 3 is the operating lever mounting part, 4 is the operating lever, 4a is the working end,
5 is a piston, 6 is a cylinder, 7 is a bar handle, 8 is a vehicle body mounting part, 9 is a bolt mounting hole, 10 is a piston stopper insertion hole, 11 is a mounting bolt,
11a and 11b are male threaded parts, 11c is a piston stopper part, 12 is a mounting member, 13 is a washer,
14 is a nut, and 15 is a return spring.

Claims (1)

[Scope of utility model registration request] In a master cylinder that is attached to a bar handle and generates hydraulic pressure by advancing a piston that is fluid-tightly movably inserted into the cylinder by rotating the operating lever, the bar handle is connected to the vehicle body mounting part of the master cylinder. and a mounting member, insert one mounting bolt into an insertion hole drilled in the mounting member and the bar handle, and screw it to the vehicle body mounting portion, while causing the tip of the mounting bolt to protrude into the cylinder. A master cylinder characterized by regulating the retraction limit of the piston.