JPS5846935Y2 - Master cylinder for motorcycles - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mask cylinder for two-wheeled vehicles such as motorcycles and bicycles, and particularly to a mask cylinder installed in a steering wheel.

In general, this type of mask cylinder has an oil tank, an operating lever, a rearview mirror, etc. attached to its cylinder body, so the external shape tends to be larger or more complicated due to the formation of the attachment parts.

Therefore, the present invention aims to simplify and downsize the external shape of the mask cylinder by integrally forming a rearview mirror mounting boss on the cylinder body so that it fits within the installation space of the oil tank on the cylinder body. Further, a notch is provided in the upper lid of the oil tank corresponding to the boss,
It is an object of this invention to prevent any hindrance from occurring in attaching a rearview mirror to the boss, and to prevent incorrect assembly of the top cover.

Embodiments of the present invention will be described below with reference to the drawings.

First, Figures 1 to 4 show an example of a brake mask cylinder for a motorcycle, which has a cylinder body 1 cast from A1 alloy.

This cylinder body 1 is provided with an oil tank 2 on the upper part, and this oil tank 2 is made of transparent synthetic resin and is fixed to the upper surface of the cylinder body 1 with bolts 3.

The upper opening of the oil tank 2 is closed by an upper lid 2a via a diaphragm 4.

An operating piston 6 slides into the cylinder hole 5 of the cylinder body 1 to define a hydraulic chamber 7 on its front surface, and this hydraulic chamber 7 is supplied with hydraulic oil from an oil tank 2. An output port 8 connected to the chamber 7 opens at the front surface of the cylinder body 1, and an oil guide pipe (not shown) connected to a wheel cylinder of a front wheel brake is connected to this opening.

A pair of upper and lower lever brackets 9 and 9' are integrally protruded from the front surface of the right end of the cylinder body 1, and the base of an operating lever 110 is pivotally supported at the center of a bolt 10 that supports both ends of these lever brackets. , the operating arm 11 of this operating lever 11
a is connected to the outer end of the working piston 6.

Further, a semi-annular knob holder 12 is integrally formed on the back surface of the cylinder body 1, and a semi-annular gripping piece 13 similar to this bundle holder 12 is arranged to sandwich the rod-shaped steering bundle H of the motorcycle from the front and back. By connecting these with tightening bolts 14, the cylinder body 1 is fixed to the steering bundle H.

Then, when the operating lever 11 is rotated toward the steering bundle H side and the operating piston 6 is moved to the left, hydraulic pressure is generated in the hydraulic chamber 7, and this hydraulic pressure is output from the output port 8 and is applied to the front brake wheel. It is transmitted to the cylinder and operates it.

The above is a conventional configuration, in which the rearview mirror mounting boss 15 is integrally formed on the cylinder body 1 so that it fits within the installation space of the oil tank 2 on the cylinder body 1. The present invention is characterized in that the upper end of the boss 15 faces a notch 16 provided in the upper lid 2a of the oil tank 2.

When molding the cylinder body 1 and the oil tank 2 separately as in the above embodiment, the rearview mirror mounting boss 15
is integrally provided on the cylinder body 1 within the range of a notch 17 formed at one corner of the oil tank 2, but as shown in FIG. 5, the cylinder body 1 and the oil tank 2i are integrated by casting etc. When molding the oil tank 2, it is desirable to form one corner of the oil tank 2 to be thicker and use the thicker part as the boss 15 for attaching the rearview mirror.In this way, the boss 15 reinforces the oil tank 2 can do.

The rearview mirror mounting boss 15 has a screw hole 18 opening at its upper end surface, into which the rearview mirror support post P is screwed.

As described above, according to the present invention, the rearview mirror mounting boss is integrally formed on the cylinder body so that it fits within the oil tank installation space on the cylinder body.
The rearview mirror mounting boss does not protrude independently from the cylinder body, but exists together with the oil tank, thereby simplifying the external shape and downsizing of the mask cylinder.

Further, since the upper end of the boss faces the notch provided in the upper lid of the oil tank, the mirror support can be smoothly attached to the boss without being obstructed by the upper lid.

Furthermore, by arranging the notch of the upper lid to face the boss, the position of the upper lid can be regulated and it can be reliably prevented from being incorrectly assembled to the oil tank. It is possible to avoid this beforehand, and there is no possibility that a cautionary note or the like displayed on the upper surface of the lid will be oriented in the opposite direction.

[Brief explanation of the drawing]

Figures 1 to 4 show a first embodiment of the present invention, where Figure 1 is a plan view, Figure 2 is a plan view with the diaphragm and top cover of the oil tank removed, and Figure 3 is a plan view of the oil tank with the diaphragm and top cover removed. is the first
4 is a sectional view taken along the line IV-IV in FIG. 1, and FIG. 5 shows a second embodiment of the present invention. It is a diagram. H... Steering bundle, 1... Cylinder body, 2...
-Oil tank, 2a...Top lid, 15...Rearview mirror mounting boss, 16...Notch.

Claims (1)

[Scope of utility model registration request] In a motorcycle mask cylinder that is attached to a steering bundle, a rearview mirror mounting boss is integrally formed on the cylinder body so that it fits within the oil tank installation space on the cylinder body, and the upper end of the boss A mask cylinder for a two-wheeled vehicle, characterized in that a portion of the mask cylinder faces a notch provided in an upper lid of the oil tank.