JPS6328049Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a reserve tank for an automobile hydraulic cylinder.

The master cylinder of automobile hydraulic brakes and the master cylinder of hydraulic clutches are equipped with a reserve tank that holds brake oil.

The brake fluid injected into the reserve tank may cause the brake fluid surface to ripple and splash as a result of vibrations or rocking of the vehicle, or the brake fluid may flow back into the reserve tank during the return stroke of the master cylinder piston. This causes the brake fluid to ripple and fly as spray. In such a case, a baffle member is attached to the underside of the cap to prevent brake fluid from leaking from the vent hole of the cap at the brake fluid inlet of the reserve tank. In order to improve the degree of prevention of brake fluid leakage, it is inevitable that the structure of the baffle member becomes complicated.

In some cases, a reserve tank is constructed by liquid-tightly connecting an upper half of the tank and a lower half of the tank, which are formed by being divided into upper and lower parts, due to their processing.

This idea is intended to provide a brake fluid leak prevention function to the upper half of the synthetic resin tank in a reserve tank that is divided into upper and lower parts.

An embodiment of this invention will be described based on the drawings.

1 is an upper half of the tank, and 2 is a lower half of the tank. The upper tank half 1 and the lower tank half 2 are liquid-tightly joined to form a tank body 3. 4 is a circular inlet provided in the upper half of the tank 1; 5 is a bridge member with a chevron-shaped cross section built within the circular inlet 4, and is provided along the imaginary diameter line of the circular inlet 4. Reference numerals 6 and 6 indicate downwardly inclined pieces provided on both sides of the bridge member 5, which are planar downwardly inclined pieces that are inclined downwardly toward an imaginary auxiliary line parallel to the imaginary diameter line. The tank upper half 1, the bridge member 5, and the downwardly inclined piece 6 are integrally molded from synthetic resin. The bridge member 5 and the downwardly inclined pieces 6, 6 are formed so that when the injection port 4 is projected onto the bottom surface of the tank body 3, the shadow of the bridge member 5 and the shadow of the downwardly inclined piece 6 do not overlap. The reserve tank 7 is thus formed. 8 is a cap that covers the injection port 4; 9 is a ventilation hole provided in the cap 8; 1
0 is a baffle member attached to the cap 8, 11 is a master cylinder, and 12 is a piston of the master cylinder.

When the cap 8 is removed and brake fluid is injected, the brake fluid flows along the bridge member 5 and the inclined pieces 6, so that the injection is smooth.

The brake fluid surface may ripple due to the vibrations or rocking of the vehicle, causing splashes, or the brake fluid may flow back into the tank body 3 during the return stroke of the piston 12 of the master cylinder 11, causing the brake fluid surface to ripple and spray. When the air escapes from the vent while blowing away, the splash is caused by the inclined members 6, 6, each having a lower surface that slopes downward toward the brake fluid level, and the bridge member 5, which also has a lower surface that slopes downward toward the brake fluid surface. Its outflow is prevented. Therefore, the structure of the baffle member 10 can be made simple, and in some cases, the buffle member can be omitted.

In addition, in this invention, the bridge member 5 and the inclined pieces 6, 6 are molded integrally with the tank body 3, so that the manufacture thereof is easy.

As mentioned above, the reserve tank of the automotive master cylinder according to this invention is a master cylinder in which the tank body 3 is formed by liquid-tightly joining the tank upper half 1 and the tank lower half 2 which are divided into upper and lower parts. In the reserve tank 7 of 11,
A bridge member 5 having a chevron-shaped cross section is constructed along the imaginary diameter line within the circular inlet 4 provided in the upper half of the tank 1, and imaginary auxiliary lines parallel to the imaginary diameter line are installed on both sides of the bridge member 5. The tank upper half 1, the bridge member 5, and the downwardly inclined pieces 6, 6 are integrally molded with synthetic resin, and the injection port 4 to tank body 3
When projected onto the bottom surface of the bridge member 5, the shadow of the bridge member 5 and the shadows of the downwardly inclined pieces 6, 6 do not overlap...preferably so that there is no gap between the shadows...bridge member 5 and downwardly inclined pieces 6, 6, which helps prevent leakage due to splashing of the brake fluid level, simplifies the structure of the buttful member of the cap, and allows people to omit the buttful member in some cases. It is something.

Note that the bridge member and the inclined piece can be of any shape, and there is no problem even if either of them is located at a high position.

[Brief explanation of the drawing]

Figures 1 to 3 show the first embodiment of the reserve tank for an automobile master cylinder according to this invention. Figure 1 is an overall vertical cutaway side view, and Figure 2 is a view with the cap removed. A plan view of the injection port in this state, FIG. 3 is a plan view cut along the line AA in FIG. 1. 4 and 5 show the second embodiment, where FIG. 4 is a diagram equivalent to FIG. 2, and FIG. 5 is a diagram equivalent to FIG. 3. 1... Upper half of the tank, 2... Lower half of the tank, 3
... Tank body, 4 ... Inlet, 5 ... Bridge member,
6... Inclined piece, 7... Reserve tank, 8... Cap, 9... Ventilation hole, 10... Buttful member,
11... Master cylinder, 12... Piston.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In the reserve tank of a master cylinder in which the upper and lower halves of the tank are liquid-tightly joined to form the tank body, the upper half of the tank A bridge member having a chevron-shaped cross section is constructed along an imaginary diameter line within the provided circular injection port, and planar downward slopes are provided on both sides of the bridge member, each of which slopes downward toward an imaginary auxiliary line parallel to the imaginary diameter line. An inclined piece is provided, and the upper half of the tank, the bridge member, and the downwardly inclined piece are integrally molded with synthetic resin, and when the injection port is projected onto the bottom surface of the tank body, the shadow of the bridge member and the downwardly inclined piece are A reserve tank for a master cylinder for an automobile, which is formed by forming a bridge member and a downwardly inclined piece so that the shadows of the pieces do not overlap. 2. Utility model registration claimed in claim 1, which is configured so that when the injection port is projected onto the bottom surface of the tank body, there is no gap between the shadow of the bridge member and the shadow of the downwardly inclined piece. Automotive master cylinder reserve tank.