KR20100005356A

KR20100005356A - Brake booster

Info

Publication number: KR20100005356A
Application number: KR1020080065354A
Authority: KR
Inventors: 조성대
Original assignee: 주식회사 만도
Priority date: 2008-07-07
Filing date: 2008-07-07
Publication date: 2010-01-15

Abstract

A brake booster is disclosed. The brake booster of the present invention includes: a cell formed by combining at least two housings; A diaphragm plate dividing the inside of the cell into at least two spaces having different pressures; And a sealing part provided at an end portion of the diaphragm plate adjacent to the cell to preserve pressure in the partitioned cell. According to the present invention, while omitting a diaphragm (Diaphram) can be effectively preserved the pressure inside the cell can reduce the manufacturing cost, as well as reduce the weight of the entire brake booster.

Description

Brake booster {BRAKE BOOSTER}

The present invention relates to a brake power booster, and more particularly, it is possible to effectively save pressure inside the cell while omitting a diaphragm, thereby reducing manufacturing costs and reducing the weight of the brake power booster as a whole. To a brake booster.

In general, the brake power booster is a device that can exhibit a large braking force even with a small force by using a pressure difference between the suction pressure and the atmospheric pressure of the vehicle engine. That is, when the driver presses the brake pedal, the device generates an output much larger than the force applied to the brake pedal.

As disclosed in Korean Utility Model Publication No. 1986-0002733 and Korean Utility Model Publication No. 1990-0007162, etc., a brake power unit connects a force between a brake pedal and a cell having a positive pressure chamber and a transformer chamber. An input shaft is provided to transmit.

1 is a cross-sectional view of a brake booster according to a conventional embodiment.

As shown in the drawing, the brake power booster 110 according to the conventional embodiment selectively opens and closes the flow path 160 in accordance with the advance and retraction of the input shaft 150 and the input shaft 150 connected to the brake pedal (not shown). And a valve device 170, an opening 180 opened and closed by the valve device 170, and a constant pressure chamber 122 and a transformer chamber 124 communicating with each other or opening with the opening 180. do.

When the user presses the brake pedal (not shown), the brake booster 110 advances the input shaft 150, and the communication between the positive pressure chamber 122 and the transformer chamber 124 is blocked, and the transformer chamber 124 stands by. While communicating with the pressure difference between the positive pressure chamber 122 and the transformer chamber 124 is generated.

The diaphragm plate 130, which divides the transformer chamber 124 by the pressure difference between the positive pressure chamber 122 and the transformer chamber 124, pressurizes the output shaft 190 so that a force amplified by the input shaft is increased. Is output to 190.

The diaphragm 140 is supported by the diaphragm plate 130. The diaphragm 140 is in close contact with the rear surface of the diaphragm plate 130 and extends to the connection portion of the front housing 127 and the rear housing 128. That is, the diaphragm 140 is provided between the positive pressure chamber 122 and the transformer chamber 124 to act as a sealing to prevent communication between the air.

However, the above-described brake booster is usually provided with a diaphragm over the entire back surface of the diaphragm plate, apart from the diaphragm plate, thus causing high manufacturing costs due to high cost of parts and complicated assembly processes. In addition, due to the weight of the diaphragm itself, there is a problem that the weight of the entire brake booster is increased as a result.

The present invention is to solve such a problem, an object of the present invention is to effectively reduce the pressure inside the cell while eliminating the diaphragm can effectively reduce the manufacturing cost, as well as to reduce the weight of the entire brake booster It is to provide a brake boosting device that can be reduced.

Brake boosting device according to the present invention for achieving the above object, at least two housings are coupled and formed (Cell); A diaphragm plate dividing the inside of the cell into at least two spaces having different pressures; And a sealing part configured to maintain a pressure in the partitioned cell provided at a position where the end of the diaphragm plate is adjacent to the cell.

The sealing part is provided along the end of the diaphragm plate, the first sealing part is elastically supported on the inner wall of the cell and prevents the leakage of the pressure, and the second sealing provided along the coupling part of the cell to prevent the leakage of the pressure. It is preferable to include a part.

The first sealing portion may be moved back and forth in contact with the inner wall of the cell according to the movement of the diaphragm plate.

The housing is a front housing forming a front portion of the cell and a rear housing forming a rear portion of the cell. The diaphragm plate preferably divides the inside of the cell into a positive pressure chamber and a transformer chamber.

The sealing portion may be provided with a rubber material.

According to the present invention, while omitting a diaphragm (Diaphram) can be effectively preserved the pressure inside the cell can reduce the manufacturing cost, as well as reduce the weight of the entire brake booster.

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

2 is a cross-sectional view of the brake power booster according to an embodiment of the present invention, and FIG. 3 is an enlarged view of part III of FIG. 2.

As shown in these figures, the brake booster 10 according to an embodiment of the present invention is a cell (20, Cell) formed by coupling the two housings (27, 28) and the inside of the cell 20 The diaphragm plate 30 to divide and the sealing part 40 provided in the position which the end of the diaphragm plate 30 adjoin the said cell 20 are included.

The cell 20 forms the exterior of the brake booster 10. The cell 20 is provided by combining the front housing 27 and the rear housing 28. The cell 20 includes a power transmission device such as an input shaft 50 and an output shaft 90, a constant pressure chamber 22, and a transformer chamber 24. The positive pressure chamber 22 and the transformer chamber 24 are in communication with each other according to the operation of the input shaft 50, the internal pressure is the same, or the transformer chamber 24 is in communication with the atmosphere, a pressure difference is generated. When a pressure difference between the positive pressure chamber 22 and the transformer chamber 24 occurs, a force amplified by the user pressurized through the input shaft 50 is transmitted to the output shaft 90. The constant pressure chamber 22 and the transformer chamber 24 inside the cell 20 are divided by the diaphragm plate 30.

The diaphragm plate 30 is a plate which distinguishes the constant pressure chamber 22 and the transformer chamber 24. When the diaphragm plate 30 is advanced, the valve node 72 is also advanced to press the output shaft 90 to generate a braking force. That is, the diaphragm plate 30 transmits the amplified force according to the pressure difference generated as the pressure in the transformer chamber 24 becomes higher than the constant pressure chamber 22 as the input shaft 50 moves forward to the output shaft 90. The diaphragm plate 30 is provided in a donut-shaped plate shape in which a central portion is drilled to shield the movement of the atmosphere between the constant pressure chamber 22 and the transformer chamber 24. Although the diaphragm plate 30 shields most of the space between the constant pressure chamber 22 and the transformer chamber 24, the sealing portion 40 is provided at a portion adjacent to the cell 20 at the end of the diaphragm plate 30.

The sealing unit 40 is a sealing member provided at a portion adjacent to the cell 20 at the end of the diaphragm plate 30. The diaphragm plate 30 shields most of the space between the positive pressure chamber 22 and the transformer chamber 24, but the diaphragm plate 30 and the cell 20 are adjacent to each other, and only the diaphragm plate 30 made of metal is used as the positive pressure chamber. Sealing between the 22 and the transformer chamber 24 is not effective. In addition, the cell 20 is also made of metal similar to the diaphragm plate 30, so that the sealing of the pressure is not effectively achieved only by the coupling of the cell 20 in the coupling portion 26 between the front housing 27 and the rear housing 28. All. The sealing part 40 is provided between the diaphragm plate 30, which is made of metal, between the cell 20 and between the coupling part 26 of the front and rear housings 27 and 28 constituting the cell 20, so that the sealing is perfect. To be done. Since the sealing part 40 is provided only at the end of the diaphragm plate 30 and the coupling part 26, it is lighter than the conventional diaphragm (140 of FIG. 1) provided over the entire diaphragm plate 30. Sealing portion 40 is provided with a rubber material. The sealing part 40 is divided into a first sealing part 42 and a second sealing part 44.

The first sealing part 42 is provided along the end of the diaphragm plate 30 and is elastically supported on the inner wall of the front housing 27 forming the cell 20. The first sealing portion 42 extends from the body 42a fitted to the end of the diaphragm plate 30 and the first sealing portion body 42b to a support 42b elastically supported on the inner wall of the cell 20. Are distinguished. The support 42b extending from the body 42a is in close contact with the inner wall of the cell 20 to shield between the constant pressure chamber 22 and the transformer chamber 24.

The second sealing part 46 is provided at the coupling part 26 of the front housing 27 and the rear housing 28. The second sealing part 46 provided in the cross section of the firing shape in the coupling part 26 prevents the pressure from leaking to the outside through the gap of the coupling part 26.

Hereinafter, the operation of the brake booster provided with the structure as described above will be described in detail.

As described above, when the external force is applied to the input shaft 50, the diaphragm plate 30 is moved in the front direction (A) by the pressure difference, the valve node 72 is also advanced along with the movement of the diaphragm plate (30) The force delivered to the output shaft 90 is then transmitted.

In order for the diaphragm plate 30 to move in the front direction (A) and to back up the input force, it is essential that the pressure inside the constant pressure chamber 22 and the transformer chamber 24 is maintained without loss.

The first sealing portion 42 is provided between the diaphragm plate 30 and the cell 20. When the diaphragm plate 30 is in the initial position, of course, even when the diaphragm plate 30 is moved in the front direction A to be in the deformation position, the support 42b of the first sealing portion 42 is elastically supported on the inner wall of the cell 20. And it moves to prevent the pressure leakage between the constant pressure chamber 22 and the transformer chamber (24).

The second sealing part 46 is provided at the coupling part 26 of the front and rear housings 27 and 28. The second sealing part 46 provided at the coupling part 26 preserves pressure that may flow in and out through the coupling part 26 of the front and rear housings 27 and 28, which are made of metal.

In the above, the present invention has been illustrated and described with respect to certain preferred embodiments. However, the present invention is not limited only to the above-described embodiments, and those skilled in the art to which the present invention pertains can variously change variously without departing from the spirit of the technical idea of the present invention described in the claims below. You can do it.

2 is a cross-sectional view of the brake booster according to an embodiment of the present invention.

FIG. 3 is an enlarged view of part III of FIG. 2.

* Description of the symbols for the main parts of the drawings *

10: brake booster 20: cell

22: front housing 24: rear housing

30: diaphragm plate 40: sealing part

42: first sealing part 46: second sealing part

Claims

A cell formed by combining at least two housings;

A diaphragm plate dividing the inside of the cell into at least two spaces having different pressures; And

And a sealing portion provided at an end of the diaphragm plate adjacent to the cell to preserve pressure in the divided cell.

The method of claim 1,

The sealing unit,

A first sealing part provided along an end of the diaphragm plate and elastically supported on an inner wall of the cell and preventing leakage of the pressure;

And a second sealing part provided along the coupling part of the cell to prevent leakage of the pressure.

The method of claim 2,

The first sealing unit,

Brake power booster, characterized in that the advancing in contact with the inner wall of the cell in accordance with the movement of the diaphragm plate.

The method of claim 1,

The housing is a front housing forming a front portion of the cell and a rear housing forming a rear portion of the cell,

The diaphragm plate, the brake booster, characterized in that the inside of the cell divided into a positive pressure chamber and a transformer chamber.

The method of claim 1,

The brake booster, characterized in that the sealing portion is provided with a rubber material.