KR0122143Y1 - Booster of a brake - Google Patents

Abstract

The present invention relates to a power boosting device for a vehicle brake, the purpose of which is to improve the rear of the output shaft expansion portion coupled to the reaction disk, to facilitate the coupling of the restoring spring to improve the workability and reduce the manufacturing cost by reducing parts .

Conventionally, in order to install the restoring spring 17, by installing a retainer 70 to prevent its separation from the end of the output shaft 40, the assembly process and the number of parts is increased, workability is reduced and production cost is increased.

However, in the present invention, by forming an annular groove 80 into which the end of the restoring spring 17 is inserted into the rear of the output shaft 40, the expansion part 42 is easy to assemble and the number of parts is reduced. Therefore, workability is improved and manufacturing cost is reduced.

Description

Power boosting device for vehicle brake

1 is a schematic view showing the overall internal configuration of a general powering device.

2 is a schematic view showing the overall internal configuration of the power supply apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

10: casing 12: front cell

13: Diaphragm 15: Constant pressure chamber

17: Restoration spring 20: Valve body

30: input shaft 40: output shaft

41: reaction disc 42: extension

80: home

The present invention relates to a power booster for a vehicle brake, and more particularly, to an output shaft of a power booster to improve the end of the output shaft to which the restoring spring is coupled to reduce the number of parts and to facilitate the coupling.

In general, a booster of a vehicle brake (BOOSTER) refers to a device that generates a large braking force with a small pressure by using the pressure difference between the vacuum and the atmosphere.

As shown in FIG. 1, a vehicle brake power booster having such a function is composed of a casing 10 composed of a front cell 12 and a rear cell 11, and the inside of the casing 10 is a diaphragm. The constant pressure chamber 15 and the transformer chamber 16 which form the front chamber and the rear chamber by the 13 and the power piston 14 are divided, and this constant pressure chamber 15 and the transformer chamber 16 are mentioned later. It communicates with the positive pressure passage 19 formed in the valve main body 20.

And the cylindrical valve main body 20 which controls the inhalation of air is provided in the casing 10. One end portion of the valve body 20 is fixed to the diaphragm 13 and the power piston 14, and the other end portion protrudes outward from the rear end portion of the casing 10, and the air intake portion in which the filter 22 is installed ( 21 is provided and is in communication with the atmosphere, the plunger 23 for sliding is provided at the front end of the valve body 20. The rear end of the plunger 23 is coupled to an end of the input shaft 30 coupled with a brake pedal (not shown), and an output shaft 40 is installed at the front end thereof, one end of the output shaft 40 and the front end of the plunger 23. A reaction disk 41 is provided to double the force applied due to the difference in cross-sectional area and transmit it to the output shaft 40, and the other end of the output shaft 40 penetrates the front cell 12 to allow the master cylinder assembly 60. Connected with

On the other hand, the valve body 20 provides a constant pressure passage 19 that provides communication between the constant pressure chamber 15 and the inside of the valve body 20, and provides a communication between the transformer chamber 16 and the valve body 20. A transformer passage 19a is provided. In addition, a poppet valve 50 for controlling the inflow of air by selectively opening and closing the positive pressure passage 19 by the operation of the input shaft 30 is provided, the rear end of which is firmly coupled to the inner circumferential surface of the valve body 20. .

In addition, the valve body 20 is provided with a first valve seat 25 for closing the positive pressure passage 19, that is, acting as a valve, by seating the tip of the poppet valve 50 on the inner circumferential surface thereof. And the first valve seat 25 combine to form a vacuum valve.

In addition, the rear end portion of the plunger 23 coupled to the end of the input shaft 30 is seated at the front end of the poppet valve 50 so as to block air from outside air from entering the transformer chamber 16. Is formed, the poppet valve 50 and the second valve seat 26 are combined to form an air valve.

On the other hand, inside the positive pressure chamber 15, one end thereof is coupled to the output shaft 40 and the other end is coupled to the inner circumferential portion of the front cell 12 so that the diaphragm 13 coupled to the output shaft 40 and the valve body 20 is provided. Restorative spring 17 is provided for convenience in the backward direction.

Operation of the power unit configured as described above is as follows. First, the positive pressure chamber 15 and the transformer chamber 16 in the initial state are vacuumed by a negative pressure source. In such a vehicle, when the driver presses a brake pedal (not shown), the input shaft 30 moves forward and at the same time, the plunger 23 coupled with the end portion is pushed.

In addition, since the poppet valve 50 serving as the air valve and the second valve seat 26 at the rear end of the plunger 23 are separated, and the poppet valve 50 is made of an elastic material, the poppet valve 50 is pushed so that this end is the first valve seat. The positive pressure passage 19 is closed so as to be seated at 25 to block communication between the constant pressure chamber 15 and the transformer chamber 16.

On the other hand, the outside air is introduced into the air inlet 21 of the valve body 20 through the gap generated by the separation of the poppet valve 50 and the second valve seat 25 to be transformed through the transformer passage 19a. Into the chamber 16, that is, atmospheric air flows into the vacuum transformer chamber 16. Therefore, this differential pressure causes the outside air to be instantaneously introduced and the diaphragm 13 and the power piston 14 which are operable are pushed with a considerable force toward the positive pressure chamber 15. At this time, the output shaft 40 is pushed to the left through the reaction disk 41 installed in the center of the power piston 14, and this force is transmitted to the master cylinder assembly 60, and the wheel cylinder is far more powerful than the force applied. It is delivered to Si) to brake. This operation occurs almost instantaneously.

When the foot is released from the brake pedal, the plunger 23 and the input shaft 30 are restored again by the elastic force of the restoring spring 17 provided in the positive pressure chamber 15.

However, in the power supply apparatus having such a configuration and operation, the following problem occurs due to the installation structure of the restoring spring 17 provided between the end of the output shaft 40 and the front cell 12, with reference to FIG. In more detail,

At the end of the output shaft 40, an extension portion 42 to which the reaction disk 41 is coupled is provided on the front surface thereof, and one end of the restoration spring 17 is coupled to the rear surface of the extension portion 42. In order to firmly couple the restoring spring 17, a retainer 70 having a seating recess 71 is installed at the rear side of the extension part 42, and one end of the restoring spring 17 is inserted and coupled.

That is, the assembly process is complicated by assembling the restoring spring 17 after separately inserting the retainer 70 in which the seating recess 71 is formed so as to firmly seat one end of the restoring spring 17.

And because the recessed groove 70 to be formed in the recessed recesses 70 inwardly, the processing is also difficult to produce a problem that the manufacturing cost rises.

The present invention is to solve this problem,

An object of the present invention is to improve the rear surface of the output shaft extension coupled to the reaction disk, to facilitate the coupling of the restoring spring to improve the workability and to reduce the manufacturing cost by reducing the parts of the vehicle brakes.

The present invention for achieving this purpose,

A diaphragm, which is built into the casing and the casing, divides the inside into a positive pressure chamber and a transformer chamber, and one end of the diaphragm is fixed to the inner circumference of the diaphragm, and an air suction unit is provided at the other end to selectively communicate with and shut off the transformer chamber and the outside air. An extension part of which an input shaft is installed at one end thereof to operate the poppet valve, an output shaft which receives the force of displacement of the input shaft and the diaphragm, and an reaction disk provided at one end of the output shaft to which the reaction disk receiving the displacement force of the input shaft is coupled to the front thereof. In the booster of the vehicle brake having one end is coupled to the output shaft and has a restoring spring for backward biasing,

The rear portion of the extension is characterized in that the groove is provided with one end of the restoration spring is inserted.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

2 is an overall configuration showing the power boosting device for a vehicle brake according to the present invention. (The power saving device for a vehicle brake according to the present invention is the same as the conventional components except for the installation structure of the restoring spring. For the description of the element, refer to the above description and will be omitted below.)

As shown in the drawing, an extension portion 42 is formed at one end of the output shaft 40, and a recessed groove 41a is formed in the front surface of the extension portion, and the reaction disk 41 is inserted and coupled thereto.

The positive pressure chamber 15 is provided with a restoring spring 17 which restores the diaphragm 13, the valve body 20, and the input shaft 30 by biasing the output shaft 40 backward, and one end of the restoring spring 17 is provided. Is coupled to one end of the output shaft 40 and the other end is coupled to the inner circumference of the front cell 12 forming the positive pressure chamber 15.

At this time, an annular groove 80 is formed on the rear of the expansion portion 42 to which the reaction disk 41 of the output shaft 40 is coupled as a characteristic element of the present invention, and the restoration spring 17 is formed in the groove 80. One end of the) is inserted and coupled to simplify the assembly.

That is, the restoring spring 17 having a function of restoring the valve body 20 and the input shaft 30 by biasing the output shaft 40 backward when the hydraulic pressure is released may have one end of the rear groove of the expansion shaft 42 of the output shaft 40. 80, and the other end is coupled to the inner peripheral portion of the front cell 12 to form a constant pressure chamber (15).

Since the operation of the power boosting device for a vehicle brake according to the present invention configured as described above is the same as the conventional one, it will be omitted below, but the characteristic operation of the present invention is as follows.

After the air from the outside air flows into the transformer chamber 16 by the advance of the input shaft 30 and back pressure is generated by the differential pressure, when the foot is released from the brake pedal, the restoring spring 17 provided in the constant pressure chamber 15 is restored by the restoring force. The plunger 23 and the input shaft 30 which were advanced are restored again.

The restoration spring 17 has one end coupled to the rear of the output shaft 40 extension 42 to which the reaction disk 41 is coupled, and the other end coupled to the inner circumference of the front cell 12. An annular groove 80 is formed on the rear surface of the expansion part 42 so that the end of the restoring spring 17 is inserted into the groove 80 to prevent the separation during operation.

Therefore, one end of the restoring spring 17 is firmly coupled to the expansion part 42 of the output shaft 40 without using a separate member, thereby improving workability assembling easily.

As described above in detail, conventionally, by installing a retainer to prevent the separation of the output shaft in order to install a restoring spring, the assembly process and the number of parts is increased, workability is lowered and production cost is increased.

However, in the present invention, by forming an annular groove into which the end of the restoring spring is inserted in the rear of the output shaft extension, assembly is simple and the number of parts is reduced.

Therefore, workability is improved and manufacturing cost is reduced.

Claims (1)

One end is fixed to the diaphragm 13 and the diaphragm 13 which are embedded in the casing 10 and the casing 10 and divide the inside into the positive pressure chamber 15 and the transformer chamber 16. The suction part 21 is provided with a valve body 20 to selectively communicate with and shut off the transformer chamber 16 and the outside air, and one end thereof is installed in the valve body 20 to operate the poppet valve 50. An output shaft 40 receiving the displacement force of the input shaft 30, the input shaft 30, and the diaphragm 13, and provided at one end of the output shaft 40 to exert a force of displacement of the input shaft 30 on the front surface thereof. In the power unit of a brake for a vehicle having an extension part 42 to which the received reaction disk 41 is coupled, one end thereof is coupled to the output shaft 40, and a restoring spring 17 for biasing it backwards. 42 is provided with a groove 80 into which one end of the restoration spring 17 is inserted. A power booster for a vehicle brake.