JPH0355515Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a master cylinder for a vehicle that hydraulically operates a brake device or a clutch device of a motorcycle, a three-wheeled vehicle, or the like.

[Conventional technology]

As shown in FIG. 3, for example, this type of master cylinder has a reservoir 2 that stands upright on the upper part of a cylinder body 1, and a liquid chamber that stores the cylinder 3 of the cylinder body 1 and the hydraulic fluid F in the reservoir 2. 4 is communicated with a relief port 5 and a ply port 6, and between the upper lip 4a of the liquid chamber 4 and the cap 7 attached to the lip 4a, the liquid level displacement of the hydraulic fluid F in the liquid chamber 4 is controlled. A diaphragm 8 following the cylinder body 1 is sandwiched, and a brewer hole 10 is bored in the upper part of the hydraulic pressure chamber 9 defined in the cylinder 3 of the cylinder body 1. Screw on Yu 12 and make Brieuda Screw 12
The head 12a of the cylinder 3 is covered with a dustproof cap 13 so that air remaining in the cylinder 3 can be discharged to the outside from the brewer hole 10 when the handlebar is attached.

[Problem that the invention attempts to solve]

However, in the case of the above structure, when air is discharged, the hydraulic fluid may be discharged from the brewer hole and adhere to the vehicle body, so the work requires connecting a hose or the like to the brewer hole, which requires time and effort.

Therefore, an object of the present invention is to provide a master cylinder that allows air bleeding to be performed easily.

[Means for solving problems]

In order to achieve the above object, the present invention provides a master cylinder for a vehicle that is equipped with a reservoir in the upper part of the cylinder body and has a brewer hole bored in the upper part of the hydraulic chamber of the cylinder body, in which a closing member that closes the brewer hole is detachable. The fluid pressure chamber is provided with a communication path which communicates the hydraulic pressure chamber and the reservoir through the brewer hole when the brewer hole is opened.

[Effect]

With this configuration, when the brewer hole is opened, air in the hydraulic pressure chamber is discharged from the brewer hole into the reservoir through the communication path.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The master cylinder 21 attached to the bar handle 20 is composed of a cylinder body 23 having a cylinder hole 22 formed therein, and a reservoir 24 integrally formed in the upper part of the cylinder body 23.

A bracket 25 extends from the front side of the cylinder body 23, and a mounting portion 26 extends from the rear side of the vehicle body.
7 is rotatably supported by a pivot 28.

A piston 29 is fluid-tightly and movably fitted into the cylinder hole 22 of the cylinder body 23, defining a hydraulic chamber 30 in the cylinder hole 22, and attached to the open end side of the cylinder hole 22 by a return spring 31. The operating arm 32 of the operating lever 27 is in contact with the rear end of the piston 29.

The reservoir 24 stores the hydraulic fluid F in the liquid chamber 33, communicates with the cylinder hole 22 through a relief port 34 and a supply port 35 provided at the bottom, and connects the upper mouth rim 33a of the liquid chamber 33 with the mouth rim. 33a
A diaphragm 37 is sandwiched between the cap 36 and the cap 36 attached to the cap 36.

Further, an auxiliary chamber 38 communicating with the hydraulic pressure chamber 30 is provided in the lower part of the hydraulic pressure chamber 30 of the cylinder body 23, and an output port 39 communicates with the lower part of the auxiliary chamber 38. Pressure fluid is supplied to the passive cylinders of the brake and clutch devices through a hose 41 connected to a threaded union bolt 40.

Furthermore, a brewer hole 4 is provided in the upper part of the hydraulic pressure chamber 30.
2 is bored, and the boss portion 43 of the brewer hole 42
, there is a screw 4 that closes the brewer hole 42.
The screw 44 has a shaft portion 44b having a smaller diameter than the threaded portion 44a at the tip of the threaded portion 44a that is screwed into the boss portion 43. Tip 4 of shaft portion 44b
4c, the brewer hole 42 is closed.

Further, an O-ring 46 that seals the mounting hole 43 is fitted into the shaft portion 44b, and a communication hole 47 that communicates with the liquid chamber 33 in the reservoir 24 is provided in the mounting hole 45 below the O-ring 46 on the side of the liquid chamber 33. is installed in a high position.

With this configuration, when the air A accumulated in the upper part of the hydraulic chamber 30 is discharged, the screw 44 is loosened and the brewer hole 42 is opened.
Since the hydraulic pressure chamber 30 and the liquid chamber 33 of the reservoir 24 communicate with each other through the brewer hole 42 and the communication hole 47, the air A is discharged into the liquid chamber 33 of the reservoir 24, and at this time, the liquid is released together with the air A. The hydraulic fluid F discharged from the pressure chamber 30 is also discharged into the fluid chamber 33 of the reservoir 24 and does not leak to the outside.
The air A in the air can be easily discharged.

[Effect of idea]

As described above, the present invention provides a communication path that communicates the hydraulic chamber and the reservoir via the brewer hole when the brewer hole for discharging air accumulated in the hydraulic pressure chamber of the hydraulic master cylinder opens. When air is discharged from the hydraulic pressure chamber, the air is discharged into the reservoir, and the hydraulic fluid discharged together with the air is also discharged into the reservoir and does not leak to the outside.
Air discharge work can be performed easily.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the present invention, where Figure 1 is a plan view of a master cylinder, Figure 2 is a sectional front view, and Figure 3 is a sectional view of a conventional master cylinder. . 20... Bar handle, 21... Master cylinder, 22... Cylinder hole, 23... Cylinder body, 24... Reservoir, 29... Piston, 30
... Hydraulic pressure chamber, 33 ... Liquid chamber, 42 ... Brewder hole, 44 ... Screw, 47 ... Communication hole, A ...
...Air, F...Hydraulic fluid.

Claims (1)

[Scope of utility model registration request] A master cylinder for a vehicle is provided with a reservoir in the upper part of the cylinder body and has a brewer hole bored in the upper part of the hydraulic chamber of the cylinder body, and a closing member for closing the brewer hole is removably provided, and the brewer hole is opened. A master cylinder for a vehicle, characterized in that a communication passage is provided that communicates the hydraulic pressure chamber and the reservoir through a brewer hole.