KR100254241B1 - Master cylinder - Google Patents

Abstract

PURPOSE: A master cylinder utilizes a single master cylinder and still performs the function of a tandem master cylinder. CONSTITUTION: A master cylinder comprises a main body(2), a piston(4), a check valve(10) and a tandem(16). The piston(4) is installed inside the main body(2) and moves interlocked with a brake pedal. The check valve(10) mounted facing the piston(4) opens a passage(14) when a pressure is above the specified pressure. The tandem suction relays brake fluid supplied through the passage(14) to a dual circuit brake line and comprises a discharging hole for the brake fluid and a shutdown mechanism. The shutdown mechanism mounted on both of the discharging hole blocks the discharging hole when the pressure of brake fluid falls.

Description

Master Cylinder of Vehicle Braking System

1 is a side cross-sectional view of a master cylinder according to the present invention.

2 is a cross-sectional view of the master cylinder according to the present invention.

3 is a side cross-sectional view of FIG.

4 is a cross-sectional view of FIG.

[Industrial use]

The present invention relates to a master cylinder of a vehicle braking device, and more particularly, to a master cylinder capable of functioning as a tandem master cylinder as a single master cylinder, which reduces installation footprint and reduces manufacturing costs.

[Private Technology]

The brake device of the vehicle includes a master cylinder for generating hydraulic pressure by a brake pedal, a wheel cylinder for receiving hydraulic pressure generated by the master cylinder through a hydraulic pipe, and a brake shoe for pressing the brake drum by the action of the wheel cylinder. .

The master cylinder has a single type and a tandem type, but the single master cylinder has a braking force deterioration when the brake line is broken. Tandem master cylinders can be supplied.

Such a tandem master cylinder arranges cylinders directly, and installs two pistons therein.

Since the tandem master cylinder adopts a structure capable of supplying braking hydraulic pressure by dividing each of the front and rear wheels, the braking force can be maintained to some extent even if any one line is damaged.

However, since the tandem master cylinder is structurally complex and used with the tandem gart, its volume is large and there is a problem in that the design of the engine room is complicated due to interference with other components in mounting in the engine room.

And such a tandem master cylinder is a factor that causes a cost increase due to the high manufacturing cost.

[Means to solve the problem]

The present invention has been made to solve the problems of the prior art as described above, an object of the present invention to provide a master cylinder of a vehicle braking device that can function as a tandem master cylinder as a single master cylinder.

In order to realize the object of the present invention as described above, a cylinder body, a piston which is installed to be movable in conjunction with a brake pedal in the inner plate body,

A check valve installed at a position opposite to the piston to open a passage at a predetermined pressure or more;

Provided is a master cylinder of a vehicle braking device including a tandem part for supplying brake fluid supplied through the passage to a two-system brake line.

The tandem part provides a master cylinder of a vehicle braking device including a discharge port through which brake fluid supplied from a cylinder body flows, and blocking means positioned at both sides of the discharge port to block the discharge port when the brake hydraulic pressure decreases.

The shut-off means is a master cylinder of a vehicle braking device including a valve capable of blocking an outlet, a spring compressed by a brake hydraulic pressure acting on the valve, and a passage opened so that atmospheric pressure can be applied to the valve.

In addition, the blocking means is a master cylinder of the brake device for a vehicle further includes a passage opening means for preventing the valve from blocking the outlet when the brake fluid exchange.

EXAMPLE

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a side cross-sectional view of a master cylinder according to the present invention, including a cylinder body 2, a piston 4 inserted into the body, a push rod 6 connecting the piston with a brake pedal, and a piston It includes a piston cup (8) located on one side and a spring (12) located between the piston cup and the check valve (10) opposite.

In addition, the passage 14 drilled in the cylinder body at the site where the check valve 10 is installed has a structure in communication with the tandem portion 16 provided in this embodiment.

2, 3, and 4 show the structure of the tandem part 16 provided by this embodiment more reliably, respectively.

When the piston 4 is pressurized in communication with the passage 14 of the cylinder body 2, the brake fluid passing through the passage 14 may flow to the outlet 20 drilled through the branch member 18. Consists of.

Brake fluid blocking means 22 and 24 are located at both sides of the branching member 18, respectively, and when the hydraulic pressure flowing to the outlet 20 is supplied to the brake pipe, the outlet is discharged when the pipe is broken or the like. It is configured to block.

The brake fluid blocking means 22 and 24 have the same structure, and have passages 26 and 28 communicating with the atmosphere, and valves 30 and 32 are provided with a spring ( 34 and 36 are pushed out by the brake hydraulic pressure flowing through the outlet 20, and the outlet can be shut off when the hydraulic pressure drops.

Under the valves 30 and 32, the screws 38 and 40 penetrate to the outlet port side to prevent the outlet port from being blocked by atmospheric pressure during brake fluid exchange.

Reference numeral 42 in the drawings is an oil supply tank containing the brake fluid.

The master cylinder of the present invention configured as described above is configured so that both ends of the delivery port 20 communicate with each of the two system brake pipes so that the brake fluid can be supplied to the brake assembly to perform braking.

In this configuration, when the driver presses the brake pedal, the piston 4 moves to the left side as shown in the drawing by the push rod 6 to pressurize the oil toward the check valve 10 side.

As the pressure of the oil increases due to this pressing force, the check valve 10 is opened and flows to the outlet 20 of the tandem portion 16 through the passage 16.

Braking is performed in a conventional manner by the brake fluid flowing through the outlet 20, wherein the valves 30 and 32 provided in the outlet 20 are brake hydraulic pressure as shown in FIG. This pushes out the springs 34 and 36 while compressing the springs, leaving the outlet completely open.

Therefore, since the outlet 20 is open to the left and right sides, the brake fluid is supplied to both sides. In this state, when one of the brake pipes is damaged and the brake fluid begins to flow out, the outlet pressure in the direction of the outlet drops immediately, and Since the same pressure is maintained, the valve blocks the outlet while moving by the elastic force of the spring.

That is, when the brake pipe supplied to the left side of the outlet 20 in FIG. 3 is broken, the valve 30 is shown in FIGS. 3A and 4B by the elastic force of the spring 34. As described above, the outlet 20 is blocked while moving downward.

Therefore, it is possible to prevent the braking force from being lowered while the brake hydraulic pressure is lowered as a whole, and braking can be realized because the brake fluid can be supplied to the other brake pipe.

[effect]

As described above, since the master cylinder according to the present invention can act as a tandem master cylinder as a single master, it is possible to manufacture a structurally simple cylinder, thereby reducing the manufacturing cost, and to produce a cylinder with a small volume as a whole. This reduces the interference with other parts when mounted in the engine room, and facilitates the design of the engine room.

Claims (4)

A cylinder main body, a piston installed in the main body so as to be movable in conjunction with a brake pedal, a check valve installed at a position opposite to the piston and opening the passage above a predetermined pressure, and supplied through the passage. Master cylinder of a vehicle braking device including a tandem for supplying the brake fluid to the two system brake lines. The master cylinder of claim 1, wherein the tandem part includes a discharge port through which the brake fluid supplied from the cylinder body flows, and blocking means positioned at both sides of the discharge port to block the discharge port when the brake fluid pressure decreases. The vehicle braking apparatus according to claim 2, wherein the shutoff means includes a valve capable of blocking the outlet port, a spring compressed by the brake hydraulic pressure acting on the valve, and a passage formed to allow atmospheric pressure to act on the valve. Master cylinder. 3. The master cylinder of claim 2, wherein the shutoff means further comprises a passage opening means for preventing the valve from blocking the outlet when the brake fluid is replaced.