KR20120138068A

KR20120138068A - Brake booster for vehicle

Info

Publication number: KR20120138068A
Application number: KR1020110057358A
Authority: KR
Inventors: 김상보; 임진혁; 노철균
Original assignee: 한국델파이주식회사
Priority date: 2011-06-14
Filing date: 2011-06-14
Publication date: 2012-12-24
Also published as: KR101530615B1

Abstract

The present invention relates to a vehicle brake booster that can be linked with the brake pedal of the vehicle to increase the operating force of the brake pedal. The brake booster includes a front piston and a rear housing attached to each other, a power piston installed through the rear housing and having a through hole formed in a front and rear direction therein, an air valve assembled in the through hole, and a clip catching jaw of the air valve. A brake booster comprising a clip interposed between the flange and the shaft and assembled to the shaft diameter portion of the power piston, wherein the outer circumference of the power piston is predetermined back and forth with respect to the rear surface of the shaft diameter portion, which is a surface where the rear surface of the clip contacts when the brake is released. A power piston groove having a width is formed along the circumference, and the power piston includes a power piston ring mounted to the power piston groove. According to the present invention, it is possible to prevent shock and click noise that may occur when the brake is released.

Description

Brake booster for vehicle

The present invention relates to a vehicle brake booster that can be linked with the brake pedal of the vehicle to increase the operating force of the brake pedal.

In a conventional brake booster for a vehicle, a push rod and an air valve inside a power piston are instantaneously released when a brake pedal is removed by brake input after brake operation. Retracted by the elastic recovery force of the spring to pull the clip (clip) to the rear.

As the clip was pulled backwards, the back of the clip quickly contacted one side of the power piston, which could generate click noise and impact the clip and power piston.

In addition, when the clip catching jaw protrudes from the air valve, the clip is pulled to the rear while the front contact with the clip catching jaw. That is, when the brake is released, not only the contact between the rear surface of the clip and one surface of the power piston, but also the click noise and impact are generated due to the contact between the front surface of the clip and the clip catching jaw. there was.

The present invention has been made to solve the problems described above, the problem to be solved by the present invention is to provide a brake booster that can prevent the shock and click noise that may occur when the brake is released.

Brake booster according to an embodiment of the present invention for achieving the above object is a power piston which is installed through the front housing and the rear housing, the rear housing attached to each other and a through hole formed in the front and rear direction inside, the through hole A brake booster including an air valve assembled to the air valve, and a clip interposed between the clip catching jaw of the air valve and the flange and assembled to the shaft diameter portion of the power piston, the outer circumference of the power piston being rearward of the clip when the brake is released. A power piston groove having a predetermined width back and forth with respect to the rear surface of the shaft diameter portion, which is a contact surface, is formed along the circumference, and the power piston includes a power piston ring mounted to the power piston groove.

The predetermined width and position of the predetermined width may be a portion of the power piston ring mounted to the power piston groove so that the impact and click noise generated when the rear surface of the clip contacts the rear surface of the shaft diameter portion is reduced. It may be a size and a position to protrude further forward.

The power piston ring may be a rubber ring having a circular or polygonal cross section.

On the outer circumference of the clip catching jaw, an air valve groove is formed along the circumference of a portion of the clip catching jaw, which is a surface contacting the front surface of the clip when the brake is released, and the air valve has a front surface of the clip. It may include an air valve ring mounted to the air valve groove so that impact and click noise generated while contacting the rear of the clip catching jaw is reduced.

A part of the air valve ring may protrude rearward from a rear surface of the clip catching jaw.

A ring locking protrusion may be formed on a bottom surface of the air valve groove to prevent the air valve ring from being separated backwards from the air valve groove.

The air valve ring may be a rubber ring having a circular or polygonal cross section that fits into an air valve groove in which the ring locking protrusion is formed.

According to the present invention, the power piston ring is provided in the power piston groove so that when the brake is released, the contact is first made to the power piston ring before the clip is directly in contact with one side of the power piston. Noise can be prevented.

In addition, the air valve ring is provided in the air valve groove so that when the brake is released, the air valve ring is first contacted before the clip is directly in contact with the rear of the clip catching jaw of the air valve. Click noise can be prevented.

In addition, since the air valve ring is provided in an inclined diamond shape (or inclined pentagonal shape), the air valve ring can be more stably fitted into the air valve groove in which the ring locking protrusion is formed, thereby preventing the air valve ring from being separated. The ring can secure a sufficient width in the front and rear direction to more effectively prevent the impact and click noise.

1 is a cross-sectional view showing a part of a brake booster according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view illustrating two examples of shapes of an air valve groove and an air valve ring of the brake booster of FIG. 1.
3 is a cross-sectional view for explaining the operation of the brake booster according to an embodiment of the present invention.

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

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

Referring to FIG. 1, a brake booster (hereinafter referred to as a 'bone brake booster') according to an embodiment of the present invention includes a front housing (not shown) and a rear housing 5. can do.

The front housing and the rear housing 5 are attached to each other such that a pressure chamber 51 is formed therein. A diaphragm 52 (diaphragm) is installed in the pressure chamber 51 formed by the front housing and the rear housing 5 to partition the pressure chamber 51 into the front and rear parts. The space in front of the two spaces divided by the diaphragm 52 acts as a vacuum chamber by being connected to the intake manifold of the vehicle to form a negative pressure, and the space in the rear is usually connected to the intake manifold of the vehicle to be negative pressure. However, when the brake pedal (not shown) of the vehicle is pressed, it is connected to the atmosphere and acts as an atmospheric chamber. The diaphragm 52 transmits the force generated by the pressure difference between the pressure chambers on both sides thereof to the master cylinder (not shown) via the power piston 1 and the reaction rod 72.

Referring to FIG. 1, the brake booster is installed through the rear housing 5 and the diaphragm 52 and has a power piston 1 formed therein with a through hole 11 in a front-rear direction (left and right directions in FIG. 1). ) May be included.

The power piston 1 is installed so that a part of the front end is located in front of the diaphragm 52. In addition, the power piston 1 is installed to be movable forward and backward within a predetermined range. And the tip of the push rod 61 moving forward in conjunction with the depression of the brake pedal (not shown) is inserted into the rear portion of the through hole of the power piston 1.

The power piston 1 may be installed to be elastically supported rearward by a return spring (not shown) supported on the inner wall of the front housing, and a reaction disc (at the front end of the power piston 1) may be installed. 71 and a reaction rod 72 may be disposed.

In addition, referring to FIG. 1, the brake booster may include an air valve 2 assembled in the through hole 11. The brake booster is interposed between the clip catching jaw 21 and the flange 22 of the air valve 2 and installed on the shaft 12 of the power piston 1. It may include.

The push rod 61, which receives the actuation force of the brake pedal, is elastically supported rearward by the spring 62 with respect to the power piston 1. Accordingly, when the push rod 61 is moved forward by the input of the brake pedal, when the input of the brake pedal is released, the push rod 61 is pushed backward by the spring force of the spring 62 to the original position. Will return.

A control valve 63 is disposed in the through hole 11 of the power piston 1 so as to be movable forward and backward. And the control valve 63, as shown in the figure, may be arranged to be located behind the air valve (2). In addition, the control valve 63 is elastically supported forward with respect to the push rod 61. For example, the control valve 63 is elastically supported in the front, that is, the direction toward the air valve 2 by the spring 46 supported by the locking projection of the push rod 61. The control valve 63 may have a through hole at the center thereof.

In addition, the air valve 2 is assembled to move forward and backward in the through hole 11 of the power piston (1). The front end of the air valve 2 extends near the front end of the power piston 1, and the rear end of the air valve 2 can be assembled in the through hole of the control valve 63.

The air valve 2 is connected to the push rod 61 to move forward and backward with the push rod 61. A hole is formed in the rear end of the air valve 2 and the tip of the push rod 61 is inserted into the hole, whereby the air valve 2 can be connected to the push rod 61. For example, the air valve 2 and the push rod 61 may be connected to each other by caulking in a state where the tip of the push rod 61 is inserted into the hole of the air valve 2.

The answer input of the brake pedal is transmitted to the reaction disc 71 and the reaction rod 72 via the push rod 61 and the air valve 2, and the reaction rod 72 transmits the transmitted braking force to the master cylinder. .

The air valve 2 is configured to operate so that air can be selectively supplied toward the diaphragm 52 depending on whether the air valve 2 is in close contact with the control valve 63. That is, the air valve 2 may operate so that air of atmospheric pressure is not supplied to the atmospheric pressure chamber located at the rear of the diaphragm 52 when the brake pedal is not pressurized, and atmospheric pressure when the brake pedal is pressurized. Air may be supplied to the atmospheric pressure chamber located behind the diaphragm 52.

When the brake pedal is not pushed in, the push rod 61 and the air valve 2 are elastically supported backward by the spring 62 and the control valve 63 is burned forward by the spring 64. Since it is sexually supported, the air valve 2 is in close contact with the control valve 45 so that atmospheric air is not supplied to the atmospheric chamber located behind the diaphragm 52. On the other hand, when the brake pedal is depressed, when the push rod 61 overcomes the elastic force of the spring 62 and is pushed forward, the air valve 2 connected thereto is also pushed forward, so that the air valve 2 Is spaced apart from the control valve 63, the atmospheric air is supplied to the atmospheric pressure chamber located behind the diaphragm 52 through the space between the control valve 63 and the air valve (2). When atmospheric pressure air is supplied to the atmospheric pressure chamber located behind the diaphragm 52, the boosting function of the brake force may be performed by the action of the diaphragm 52.

On the other hand, referring to Figure 1, the outer circumference of the above-described power piston 1 has a predetermined width back and forth with respect to the rear surface 122 of the shaft diameter portion 12 which is the surface that the rear surface 32 of the clip 3 is in contact when the brake is released. A power piston groove 13 having is formed along the perimeter. The power piston 1 also includes a power piston ring 14 mounted in such a power piston groove 13.

Here, the size and position of the predetermined width is in the power piston groove 13 so that the impact and click noise generated while the rear surface 32 of the clip 3 contacts the rear surface 122 of the shaft 12 is reduced. A portion of the mounted power piston ring 14 may be sized and positioned to protrude forward than the rear surface 122 of the shaft portion 12. In addition, the depth of the power piston groove 13 is preferably determined together with the width of the power piston groove 13 in accordance with the size and shape of the power piston ring 14 in consideration of the reduction of the impact and click noise. .

That is, in the brake booster which uses the clip 3 between the power piston 1 and the air valve 2 to determine the performance when the brake is operated and the performance when the brake is released, the power piston 1 and the clip ( 3) A power piston groove 13 of a predetermined size and depth is formed in the power piston 1 for the purpose of reducing click noise and impact due to contact therebetween, and a circular or polygonal power piston in the power piston groove 13 is formed. By inserting the ring 14, it is possible to absorb shock and prevent click noise.

The power piston ring 14 may be made of a material that can be elastically compressed or tensioned with respect to a predetermined compressive force or tensile force, such as a rubber. Illustratively, the power piston ring 14 may be a rubber ring having a circular, elliptical, or polygonal cross section. In exemplary embodiments, the power piston ring 14 may be an O-ring made of rubber. In addition, the size or shape of the circular or polygonal cross section of the power piston ring 14 effectively prevents shock and click noise generated when the rear surface 32 of the clip 3 contacts the rear surface 122 of the shaft diameter portion 12. It may be of a size and shape that can be reduced.

Meanwhile, referring to FIG. 1, the outer periphery of the clip catching jaw 21 of the air valve 2 is connected to the rear surface 212 of the clip catching jaw 21, which is a surface on which the front face 31 of the clip 3 contacts when the brake is released. An air valve groove 23 may be formed along a circumference at a portion to be connected. In addition, the air valve 2 is mounted to the air valve groove 23 so that impact and click noise generated while the front surface 31 of the clip 3 contacts the rear surface 212 of the clip catching jaw 21 is reduced. It may include an air valve ring 24.

As such, a part of the air valve ring 24 mounted to the air valve groove 23 may protrude rearward from the rear surface 212 of the clip catching jaw 21. In addition, the size (scale) of the air valve ring 24 is preferably provided in an optimal size (scale) in consideration of the above-described reduction of impact and click noise. In addition, the width and depth of the air valve groove 23 may be determined in accordance with the size and shape of the air valve ring 24 in consideration of such a reduction in impact and click noise.

That is, in the brake booster which uses the clip 3 between the power piston 1 and the air valve 2 to determine the performance at the time of brake operation and the performance at the time of brake release, the air valve 2 and the clip ( 3) An air valve groove 23 of a predetermined size and depth is formed in the air valve 2 for the purpose of reducing click noise and impact due to contact between the air valve grooves, and a circular or polygon air valve in the air valve groove 23. By inserting the ring 24, the shock can be absorbed and click noise can be prevented.

FIG. 2 is a cross-sectional view illustrating two examples of shapes of an air valve groove and an air valve ring of the brake booster of FIG. 1.

Referring to FIG. 2, a ring locking protrusion 232 may be formed on the bottom surface 231 of the air valve groove 23 to prevent the air valve ring 24 from being separated from the air valve groove 23 rearward. have. As shown in FIG. 2, the ring locking protrusion 232 may be formed at the rear end of the bottom surface 231 of the air valve groove 23. Alternatively, as another example, the ring locking protrusion 232 is formed in the middle of the bottom surface 231 of the air valve groove 23, and the air valve ring 24 is provided in a shape to engage with the ring locking protrusion 232. Detaching of the air valve ring 24 may be prevented.

In addition, the air valve ring 24 may be made of a material that can be elastically compressed or tensioned with respect to a predetermined compressive force or tensile force, such as a rubber (rubber). 1 and 2, the air valve ring 24 may be a rubber ring having a circular, elliptical, and polygonal cross section. In exemplary embodiments, the air valve ring 24 may be an O-ring made of rubber. In addition, the size or shape of the circular or polygonal cross section of the air valve ring 24 is a size and shape that can be fitted into the air valve groove 23 in which the ring locking protrusion 232 is formed, and at the same time, the clip 3 It may be of a size and shape that can effectively reduce the impact and click noise generated when the front surface 31 of the) in contact with the rear surface 212 of the clip engaging jaw (21).

For example, as shown in FIG. 2B, the air valve ring 24 may be inclined diamond shape (or inclined pentagonal shape). As the air valve ring 24 is provided in a shape as shown in FIG. 2B, the air valve ring 24 is more stably fitted into the air valve groove 23 in which the ring locking protrusion 232 is formed. Departure can be prevented. In addition, through such a shape, the air valve ring 24 can secure a sufficient width in the front-rear direction, thereby more effectively reducing the above-described impact and click noise.

The operation of the brake booster will be briefly described with reference to the respective configurations described above.

3 is a cross-sectional view for explaining the operation of the brake booster according to an embodiment of the present invention.

3 (a) shows a state in which the push rod 61 is moved forward (left in FIG. 3) in conjunction with depression of the brake pedal, that is, a brake operating state in which the input of the brake pedal is transmitted to the master cylinder. For reference, in such a brake operating state, the springs 62 and 64 may be elastically compressed by a predetermined amount, and the flange 22 and the control valve 63 of the air valve 2 may be in close contact with each other. Air may be supplied toward the diaphragm 52 through the gap. At this time, the clip 3 has a rear surface 32 in contact with the front surface 221 of the flange 22 of the air valve 2, as shown in (a) of FIG. 3, the clip of the air valve (2) The rear surface 212 of the locking jaw 21 and the rear surface 122 of the shaft diameter portion 12 are not in contact with each other.

When the brake pedal is released from the brake pedal in such a brake operation state and the brake is released, as shown in FIG. 3B, the push rod 61 and the air valve 2 are caused by the elastic recovery force of the springs 62 and 64. ), The clip 3 is also pulled backwards. At this time, the clip 3 is pulled to the rear while the front face 31 contacts the rear face 212 of the clip catching jaw 21 of the air valve 2, as shown in (b) of FIG. As a result, the rear surface 32 of the clip 3 also comes into contact with the rear surface 122 of the shaft diameter portion 12.

The conventional brake booster has a problem in that click noise and shock are generated by the contact when the brake is released. However, the brake booster includes a power piston ring 14 in the power piston groove 13 so that the rear surface 32 of the clip 3 is the rear surface 122 of the shaft 12 of the power piston 1 when the brake is released. By first making contact with the power piston ring 14 before being directly contacted), it is possible to prevent shock and click noise that may occur when the brake is released. In addition, an air valve ring 24 is provided in the air valve groove 23 so that the front surface 31 of the clip 3 is connected to the rear surface 212 of the clip catching jaw 21 of the air valve 2 when the brake is released. Prior contact is made to the air valve ring 24 before direct contact, thereby preventing shock and click noise that may occur when the brake is released.

While the present invention has been particularly shown and described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And all changes and modifications to the scope of the invention.

1. Power piston
11.Through hole 12. Shaft diameter part
121. Front (axial) 122. Front (axial)
13. Power piston groove 14. Power piston ring
2. Air valve
21. Clip catching jaw 212. Rear of (clip catching jaw)
22. Flange 221. Front (of flange)
23. Air valve groove 231. Bottom
232. Ring Engagement 24. Air Valve Ring
3. Clip
31. (clip) front 32. (clip) rear
5. Rear housing
51. Pressure chamber 52. Diaphragm
61. Push Rod 62. Spring
63. Control valve 64. Spring
71. Reaction disc 72. Reaction load

Claims

A front piston and a rear housing attached to each other, a power piston installed through the rear housing and having a through hole formed in the front and rear directions therebetween, an air valve assembled to the through hole, and a clip catching jaw and a flange of the air valve. A brake booster comprising a clip interposed and assembled to the shaft diameter portion of the power piston,
On the outer circumference of the power piston, a power piston groove having a predetermined width is formed along the circumference with respect to the rear surface of the shaft diameter portion, which is the surface where the rear surface of the clip contacts when the brake is released.
The power piston is a brake booster including a power piston ring mounted to the power piston groove.

In claim 1,
The predetermined width and position of the predetermined width may be a portion of the power piston ring mounted to the power piston groove so that the impact and click noise generated when the rear surface of the clip contacts the rear surface of the shaft diameter portion is reduced. Brake boosters that are sized and positioned to protrude further forward.

In claim 2,
The power piston ring is a brake booster is a rubber ring of a circular or polygonal cross section.

4. The method according to any one of claims 1 to 3,
On the outer circumference of the clip catching jaw, an air valve groove is formed along a circumference at a portion connected to the rear face of the clip catching jaw, which is a surface contacting the front surface of the clip when the brake is released.
And the air valve includes an air valve ring mounted to the air valve groove to reduce impact and click noise generated when the front surface of the clip contacts the rear surface of the clip catching jaw.

5. The method of claim 4,
A part of the air valve ring is a brake booster protruding rearward from the rear of the clip catching jaw.

5. The method of claim 4,
And a ring locking protrusion formed on a bottom surface of the air valve groove to prevent the air valve ring from being separated backwards from the air valve groove.

The method of claim 6,
The air valve ring is a brake booster is a rubber ring of a circular or polygonal cross section that is fitted into the air valve groove formed with the ring engaging projection.