JPS5827869Y2 - Master cylinder reservoir tank - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a reservoir tank of a mask cylinder.

Generally, the mask cylinder is designed to close at the beginning of the forward motion of the piston, which is a relief port that communicates between the cylinder and the reservoir tank, so there is a slight play section in the piston's operating stroke until the relief port closes. The brake fluid pressurized by the piston in the section causes a so-called fountain phenomenon in which it violently squirts out from the relief port into the reservoir tank, and this fountain phenomenon stirs the brake fluid in the server tank and causes air bubbles to enter the fluid. This may lead to inconveniences such as fluid leakage from the airtight part of the reservoir tank top cover, and vibrations from the vehicle body may cause bubbles to form at the interface between the air in the reservoir tank and the brake fluid, and this phenomenon gradually increases. The entire brake system in the server tank is foaming, and the brake fluid containing minute bubbles has reached the pressure chamber of the mask cylinder, and even if you push the piston, the bubbles will just get soaked and no fluid pressure will be generated. A paper lock phenomenon will occur and a dangerous situation will occur.

Therefore, conventionally, the reservoir tank is divided into upper and lower parts, and the bottom wall of the reservoir tank is opposed to the relief port to prevent air bubbles from being generated and mixed in. However, the liquid chamber between the bottom wall of the reservoir tank and the cylinder body is In this case, the brake fluid is agitated to some extent and bubbles are generated, and the bubbles that have once entered the master cylinder are not quickly discharged from the fluid chamber to the upper reservoir chamber, making it difficult to remove the bubbles.

The present invention solves the above-mentioned problems, and includes a small hole at the top, a flange with a diameter slightly larger than the inner diameter of the reservoir tank at the bottom,
A diverter plate having an appropriate number of ribs on the outer wall that is higher than the top and a conical hollow part with an open bottom is pressed against the inner wall of the reservoir tank with the flanges, and the brake fluid is internally sealed to provide a seal. In order to ensure that air can be vented during injection and replacement work, and to limit the agitation of the brake fluid due to vibrations of the vehicle body, etc., to reduce the generation of air bubbles due to foaming in the reservoir tank. The present invention is characterized in that even if air bubbles are generated in the tank, air is prevented from entering the pressure chamber, and furthermore, the air that has once entered the mask cylinder is quickly discharged into the reservoir tank.

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

1 is a mask cylinder body, 2 is a piston slidably provided in a cylinder 3 formed in the mask cylinder body 1, 4 is a reservoir tank formed integrally with the mask cylinder body 1, and a bottom side wall of the reservoir tank 4. A relief port 7 and a supply port 8 communicating with the pressure chamber 6 are formed in the pressure chamber 5 .

9 is a divert plate, and this daypart top plate 9
The top part 10 has a small hole 11, the bottom part 12 has a flange 13 that opens outward and has a diameter slightly larger than the inner diameter of the reservoir tank 4 and stands up, and the outer wall 14 has an appropriate number of flanges that protrude higher than the top part 10. Each has a wing-shaped rib 15 and a conical hollow part 16 with an open bottom on the inside.

When this department plate 9 is inserted into the reservoir tank 4 and installed on the stepped portion 4a, a tightening margin is provided by the flange 13, and the department plate 9! /''i It is tightly installed and sealed on the inner wall of the reservoir tank 4.

Inside the reservoir tank 4, an upper liquid chamber 11 and a lower liquid chamber 18 are defined by the die heart plate 9, and the upper liquid chamber 17 and the lower liquid chamber 18 communicate with each other through the small hole 11 of the die heart plate 9.

19 is an annular groove 20 formed on the inner wall of the reservoir tank 4.
The upper end of the flange 13 of the department plate 9 is fixed by a circlip fitted with the circlip to prevent the department plate 9 from lifting up.

21 is a diaphragm, and 22 is a cap.

In the above embodiment, the department plate is housed in a vertical mask cylinder glue server tank, but it goes without saying that it may be a normal horizontal mask cylinder.

Further, although the hollow portion 16 is formed in a conical shape, it may have another conical shape.

Next, the operation of the above embodiment will be explained. When the mask cylinder body 1 is assembled to the mounting part of the vehicle body and the brake fluid is injected into the IJ server tank 4 or when the brake fluid is replaced, etc. Even if the brake fluid is filled from the small hole 11 into the mask cylinder, the piping connected thereto, or the lower fluid chamber 18 in the absence of brake fluid, the air present therein will be absorbed into the conical hollow part 1 of the die heart plate 90.
6, the liquid is guided by the conical surface and rises, and floats to the liquid surface through the small hole 11, thereby effectively removing air.

The cone angle of the conical hollow portion 16 is such that air is guided to the conical surface and easily rises, and the small hole 11 is made large enough to allow air to pass through.

Furthermore, even if the reservoir tank 4 vibrates due to vibrations of the vehicle body, etc., the vibration, agitation, and ripples of the brake fluid are reduced by the wing-shaped ribs 15 of the department plate 9, and the air in the reservoir tank 4 and the brake fluid are Even if air bubbles are generated due to vibration or the like, the department plate 9 having a small hole 11 at the top 10 is installed in the reservoir tank 4 in close contact with the reservoir tank 4 to provide a sealing property. Since the upper liquid chamber 17 and the lower liquid chamber 18 are communicated with each other through the small hole 11, air bubbles are prevented from entering the lower liquid chamber 18 through the small hole 11, and by operating the piston 2, the reservoir tank 4 is Even if the brake fluid inside is sucked into the pressure chamber 6, air is not sucked into the pressure chamber 6, and smooth and stable braking can be performed.

Furthermore, even if the brake fluid blows up from the pressure chamber 6 and mixes air bubbles into the lower liquid chamber 18 when air is vented into the lower liquid chamber 18 or during operation, the air bubbles are removed from the conical hollow part 1 of the department plate 9.
6 is guided by the conical surface, rises, and is discharged from the small hole 11 to the upper liquid chamber 17, thereby preventing air bubbles from entering the pressure chamber 6.

Further, when the diaphragm 21 descends due to a decrease in brake fluid, the lower end of the diaphragm 21 comes into contact with the upper end of the rib 15 of the department plate 9, as shown in FIG.
Brake fluid is supplied to the lower fluid chamber 18 without blocking the lower fluid chamber 18.

As explained above, the present invention is a diagonal disk having a small hole at the top, a flange with a diameter slightly larger than the inner diameter of the reservoir tank at the bottom, an appropriate number of ribs higher than the top on the outer wall, and a conical hollow part with an open bottom. The flanges of the part plate are pressed against the inner wall of the reservoir tank, and the sealing properties are ensured so that the air in the pressure chamber or the bottom of the reservoir tank is reliably bleed out during brake fluid injection and replacement work, and the air in the bottom of the reservoir tank is securely removed. It is possible to limit the agitation of the brake fluid due to vibrations, etc., which reduces the occurrence of air bubbles in the reservoir tank, and even if air bubbles occur, they do not enter the pressure chamber, and there is no drop during operation. Even if air bubbles get mixed into the fluid chamber, they are quickly discharged into the reservoir tank, and air does not get mixed in with the brake fluid supplied from the reservoir tank.By operating the piston, the brake fluid is removed from the pressure chamber. Even if air is supplied to the pressure chamber, air is not sucked into the pressure chamber, so smooth and stable braking can be performed.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a cross-sectional front view, Fig. 2 is a partially cutaway perspective view of a department plate,
FIG. 3 is a sectional view showing a state in which the diaphragm is in contact with the department plate. 1 is a mask cylinder body, 4 is a reservoir tank, 9 is a department plate, 11 is a small hole thereof, 13 is a flange, 15 is a rib, and 16 is a conical hollow part.

Claims (1)

[Scope of utility model registration request] The inner wall of the reservoir tank has a divert plate that has a small hole at the top, a flange with a diameter slightly larger than the inner diameter of the reservoir tank at the bottom, an appropriate number of ribs higher than the top on the outer wall, and a conical hollow part with an open bottom. A reservoir tank for a mask cylinder, characterized in that the flange is pressed into contact with the flange and installed inside the tank.