JPS5819497B2 - master cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mask cylinder in a brake device for a vehicle.

Some mask cylinders have a reservoir molded from a material such as resin separately from a mask cylinder body in which a cylinder portion is formed, and the reservoir is attached to the mask cylinder body with screws.

However, with this installation method, there is a risk that the screws may loosen due to vehicle vibrations, and the reservoir may come off from the mask cylinder body if external force is applied, such as by falling over, as the reservoir is held in the mask cylinder body only by the sealing member that is in pressure contact with the reservoir. There was sex.

The present invention aims to solve the above-mentioned problems, and the feature of the structure is that in a mask cylinder in which the reservoir is attached to the mask cylinder body with screws, holes are bored at different positions. A restraining plate is formed by connecting two plates at intervals in the axial direction of the reservoir, and the restraining plate is engaged with the reservoir in the radial direction of the reservoir with the restraining plate facing the head of the screw. This is because it is arranged so as to prevent the screw from stopping and also to suppress the head of the screw.

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

In FIGS. 1 to 3, reference numeral 1 denotes a mask cylinder body made of aluminum alloy casting or the like, and a reservoir 4 molded with resin or the like so as to cover the relief port 2 and supply port 3. The reservoir 4 is attached to the mask cylinder body 1 with screws 5 passing through holes in the bottom side flange 4a of the reservoir 4.

A washer 6 is interposed between the screw 5 and the flange 4a,
The washer 6 applies the tightening force of the screw 5 evenly to the flange 4a of the reservoir 4.

A cap groove 7 (see FIG. 3) is formed in the inner peripheral surface of the reservoir 4, extending from the bottom side to the upper side.

Then, a holding plate 8 having a protrusion 8a that engages with the bag groove 7 is inserted from the upper opening of the reservoir, the protruding part 8a of the holding plate 8 is engaged in the bag groove 7, and the holding plate 8 screws the screws. The head of screw 5 is held down, thereby preventing the screw 5 from turning.

FIGS. 4 and 5 show an example of the holding plate 8. The holding plate 8 is made up of two connected plates, and each plate has holes 8', 8' and ...is established.

And the plate part of the holding plate 8 is IJ IJ-Fubot 2,
It is also a so-called baffle plate that is located above the supply port 3 and reduces the force of the liquid ejected from these ports into the reservoir 4 to prevent a cloudy phenomenon from occurring within the reservoir 4.

Furthermore, the upper surface of the oil in the reservoir 4 and the air inside the reservoir 4 mix due to vibration, forming thin air bubbles in the oil, which prevents these from entering the pressure oil chamber of the mask cylinder body 1.
This is prevented by two plates.

A seal member 9 is in pressure contact with the outer peripheral surface of the reservoir 4 and maintains liquid tightness between the mask cylinder body 1 and the reservoir 4.

In addition to the shape described above, the restraining plate 8 may also be a band-shaped plate, and preferably one having elasticity will be easier to attach.

Furthermore, even if the restraining plate 8 does not come into direct contact with the screw 5 and is attached with a slight gap between it and the screw 5, it can suppress the screw 5 from screwing out and prevent it from coming off.

According to the present invention as described above, in a mask cylinder in which the reservoir is attached to the mask cylinder body with screws, two plates having holes bored at different positions are spaced apart in the axial direction of the reservoir. Since the retaining plate is connected to form a retaining plate, the retaining plate can sufficiently perform the function of a baffle plate, and the retaining plate can be opposed to the head of the screw and engaged with the reservoir in the radial direction of the reservoir. In addition, since it is arranged so as to hold down the head of the screw, the holding plate can be stably positioned, preventing the screw from loosening due to vibration, etc., and even if the screw loosens, the screw will not come off. It has the effect of being safe without any problems.

[Brief explanation of the drawing]

FIG. 1 shows a mask cylinder according to the present invention, and FIG.
A cross-sectional view of the main part taken along line I, Figure 2 is the same as Figure 1.
Figure 3 is a cross-sectional view taken along line I-I in Figure 2, Figure 4 is a plan view when the baffle plate is used as a restraining plate, and Figure 5 is a cross-sectional view taken along line II in Figure 4. ■It is a sectional view taken along the line V. 1... Mask cylinder body, 4... Reservoir, 5... Screw, 7... Cap groove, 8
...Retaining plate, 8a... Protrusion, 8'.
・・・Children

Claims (1)

[Claims] 1. In a mask cylinder in which the reservoir is attached to the mask cylinder body with screws, two plates with holes bored at different positions are connected at an interval in the axial direction of the reservoir to form a restraining plate. The mask cylinder is characterized in that the holding plate is arranged to face the head of the screw, to be locked to the reservoir in the radial direction of the reservoir, and to hold down the head of the screw.