JPH0349088Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Detailed Description of the Invention] [Background of the Invention] The present invention is of a type that is fluidly connected to the parent cylinder through a hole provided at the bottom of the oil storage device, and has a cover and a The present invention relates to an oil storage device for a parent cylinder of a hydraulic brake in a general motorcycle, particularly a cross-country motorcycle, having a partition wall suspended from a cover to the bottom.

It is well known that oil in a storage device tends to become turbid with air due to sudden starts and vibrations of a traveling motorcycle. Bubbles are particularly likely to form on the surface, and a large number of bubbles remain encapsulated in the oil.

This phenomenon is particularly noticeable in motorcycles designed for cross-country racing, as they are subject to especially sudden starts and strong vibrations during competition.

When such bubbles are formed, they are undesirably entrained by the oil and enter the brake master cylinder from the storage device through the holes, thereby impairing the effectiveness and speed of braking action.

It is noteworthy that the agitation effect on the oil caused by sudden starts and vibrations can be reduced by providing a partition wall. However, this partition itself does not prevent the above-mentioned disturbances caused by air bubbles migrating from the storage device into the parent cylinder. To prevent air bubbles from passing through the holes from the oil storage device and reaching the parent cylinder, the hole entrances may be locally surfaced and fitted with metal wire or perforated plates or both. As a countermeasure, it has been proposed to install a screen in the area.

Although this method is advantageous in various respects and has substantially achieved its purpose, it is actually expensive and difficult to implement. In practice, precise machining is required, and if this is applied, the assembly operation at the installation stage is troublesome due to the small size.

[Summary of the idea]

It is an object of the present invention to provide a storage device of the title having a structure and operating characteristics that overcome the problems of the cited prior art.

The purpose is to provide a bell shaped member of a resiliently flexible material supported by the septum, which completely surrounds the aperture and is in sealing contact engagement with the outer periphery of the bottom, and at least one small aperture within said bell shaped member. This is achieved by the storage device of the title, characterized in that it has the following.

Other features and advantages of the invention will become apparent from the following description of the preferred embodiment shown, but the invention is not limited to the embodiment shown in the accompanying drawings.

〔Example〕

According to the accompanying drawings, number 1 designates the entire oil storage device for the brake master cylinder 2, which is intended to be mounted in a completely conventional manner on the handlebar of a motorcycle, especially a cross-country motorcycle. There is.

The storage device 1 and the parent cylinder 2 are integrally formed as a single part 3, which part 3 is preferably a chilled casting of an aluminum alloy, and is divided by an arcuate wall 4 of the part 3, which is also a part of the parent cylinder. It forms the cylindrical skirt of the cylinder 2 and the bottom of the storage device 1 .

The storage device 1 has a hole 5 formed through the bottom 4
It forms a fluid connection with the parent cylinder 2 through the hole 5.
Preferably, the holes are drilled.

In order to prevent the tip of the drill from bouncing or being damaged at the start of drilling work for hole 5,
It is noteworthy that a cut surface 6 is formed on the bottom part 4 at the location of the hole 5.

The storage device 1 has a rectangular lid 7 on the top, and the lid 7
is fastened to the component 3 with two screws 8 on the short side.
A rectangular rubber gasket 9 is assembled in a completely conventional manner on the underside of the lid. The septum 10 extends approximately perpendicularly from the lid 7 parallel to the short side of the lid to slightly above the hole 5 in the bottom 4.

The partition wall 10 is formed integrally with the gasket 9 and reinforced with triangular ribs 11, which are also formed integrally with the gasket 9, and the partition wall 10 is parallel to the long side of the lid.

The storage device 1 according to the invention has a bell-shaped member 1 made of an elastic flexible material and having a crown part 13 and a peripheral rim 14.
Contains 2. The crown 13 of the bell 12 is supported by the septum 10, the rim 14 of which completely surrounds the bore 5 and is in sealing contact engagement with the outer periphery of the bottom 4.

The rim 14 corresponds to the shape of the bottom 4 and is therefore curved to the same curve as the bottom, but with a shaved surface 6
It should be noted that only a small portion 15 facing the surface is flat.

Four small holes 16 are provided in the crown of the bell-shaped member 12, and these small holes 16 are for passing oil and have a small diameter of, for example, 1 mm.

It is expedient to manufacture the bell-shaped member 12 integrally with the partition wall 10.

The bell 12 makes it possible to carry out certain screening operations of the holes 5 in the storage device 1 in a particularly simple and economical manner. Since the elastic flexible bell can engage directly with the chilled casting bottom 4, local machining of the part 3 is actually no longer necessary. Furthermore, when the gasket and bulkhead are assembled, the bell-like member automatically falls into place, completely reducing the time required for the conventionally troublesome assembly.

Since the rubber bell-shaped member does not break at all during its installation and during running, it is expected that the oil storage device according to the present invention will have extremely high reliability during running, and this advantage cannot be ignored either. .

The storage device disclosed herein can of course be modified in various ways by those skilled in the art based on special requirements, but these do not fall within the scope of protection of the invention as set out in the attached utility model claims. It's not something to escape from.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the storage device according to the present invention;
1 is a partially sectional exploded perspective view of the storage device of FIG. 1, and FIG. 3 is a detailed view of the storage device of FIG. 1. DESCRIPTION OF SYMBOLS 1... Storage device, 2... Parent cylinder, 4... Bottom, 5... Hole, 7... Lid, 10... Partition wall, 12
... Bell-shaped member, 16 ... Small hole.

Claims (1)

[Scope of utility model registration request] A general motorcycle, particularly a cross-country motorcycle, which is of a type that is fluidly connected to a parent cylinder through a hole provided at the bottom of an oil storage device, and has a cover and a bulkhead suspended from the cover to the bottom. In the oil storage device for a parent cylinder of a hydraulic brake, a bell-shaped member 12 made of an elastic flexible material is provided which is supported by the partition wall 10 and completely surrounds the hole 5 to form a sealing contact engagement with the outer periphery of the bottom portion 4. , forming at least one small hole 16 in the bell-shaped member 12;
2 and the partition wall 10 are integrally formed.