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KR100655466B1 - Car brake booster - Google Patents

Car brake booster Download PDF

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Publication number
KR100655466B1
KR100655466B1 KR1020030030816A KR20030030816A KR100655466B1 KR 100655466 B1 KR100655466 B1 KR 100655466B1 KR 1020030030816 A KR1020030030816 A KR 1020030030816A KR 20030030816 A KR20030030816 A KR 20030030816A KR 100655466 B1 KR100655466 B1 KR 100655466B1
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South Korea
Prior art keywords
valve body
power piston
brake booster
diaphragm
vehicle
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Expired - Fee Related
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KR1020030030816A
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Korean (ko)
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KR20040098443A (en
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김철수
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주식회사 만도
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
    • B60T13/46—Vacuum systems
    • B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
    • B60T13/57—Vacuum systems indirect, i.e. vacuum booster units characterised by constructional features of control valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
    • B60T13/46—Vacuum systems
    • B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
    • B60T13/567—Vacuum systems indirect, i.e. vacuum booster units characterised by constructional features of the casing or by its strengthening or mounting arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
    • B60T13/46—Vacuum systems
    • B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
    • B60T13/573—Vacuum systems indirect, i.e. vacuum booster units characterised by reaction devices

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Systems And Boosters (AREA)

Abstract

본 발명은 밸브본체에 가해지는 응력의 집중을 해소하여 내구성의 증대를 가져오게하는 차량용 브레이크 부스터를 제공하는 것이다. The present invention is to provide a brake booster for a vehicle to solve the concentration of stress applied to the valve body to increase the durability.

이를 위한 본 발명에 따른 차량용 브레이크 부스터에 의하면 ; 밸브본체는 다단으로 단차진 원통형상으로 마련되며, 일단 외주의 단차부위에는 프론트다이아프램과 프론트파워피스톤이 끼워져 결합된다. 상기 밸브본체에 끼워지는 상기 프론트파워피스톤의 밸브본체지지부는 folding되어 상기 밸브본체를 지지하도록 마련됨으로써, 밸브본체에 가해지던 응력집중을 해소할수 있게 되는 작용효과가 있다.According to the vehicle brake booster according to the present invention for this purpose; The valve body is provided in a multi-stage stepped cylindrical shape, and once the front diaphragm and the front power piston are fitted to the stepped portion of the outer circumference. The valve body supporting portion of the front power piston fitted to the valve body is folded to support the valve body, thereby reducing the stress concentration applied to the valve body.

Description

차량용 브레이크 부스터{Brake booster for automobile}Brake booster for automobile

도 1 은 종래 차량용 브레이크 부스터의 내부구조를 보인 단면도이다.1 is a cross-sectional view showing the internal structure of a conventional brake booster for a vehicle.

도 2 는 종래 차량용 브레이크 부스터의 밸브본체와 파워피스톤의 결합부위를 확대한 확대도이다. 2 is an enlarged view illustrating an enlarged coupling portion of a valve body and a power piston of a conventional brake booster for a vehicle.

도 3 은 본 발명에 따른 차량용 브레이크 부스터의 내부구조를 보인 단면도이다.3 is a cross-sectional view showing the internal structure of a vehicle brake booster according to the present invention.

도 4 는 본 발명에 따른 차량용 브레이크 부스터의 밸브본체와 파워피스톤의 결합부위를 확대한 확대도이다. 4 is an enlarged view illustrating an enlarged coupling portion of a valve body and a power piston of a vehicle brake booster according to the present invention.

*도면의 주요부분에 대한 부호의 설명*   * Explanation of symbols for main parts of drawings *

11c : 센터플레이트 13a : 다이아프램11c: center plate 13a: diaphragm

13b : 파워피스톤 13e : 밸브본체 지지부13b: power piston 13e: valve body support

16 : 밸브본체16: valve body

본 발명은 차량용 브레이크 부스터에 관한 것으로, 더욱 상세하게는 부스터의 힘을 발생시키는 파워피스톤에 관한 것이다. The present invention relates to a vehicle brake booster, and more particularly to a power piston for generating a booster force.                         

차량용 브레이크 부스터(BOOSTER)는 진공과 대기와의 기압차이를 이용하여 작은 힘으로 큰 제동력을 발생시키는 장치를 말하며, 전방셀의 전면부에 마스터실린더가 결합되어 있어서 증폭된 힘을 이용하여 제동유압을 형성하게 된다. 도 1은 이러한 기능을 하는 종래 차량용 브레이크 부스터를 보인 것이다.BOOSTER is a device that generates a large braking force with a small force by using the air pressure difference between the vacuum and the atmosphere, and the master cylinder is coupled to the front part of the front cell to apply the braking hydraulic pressure using the amplified force. To form. Figure 1 shows a conventional vehicle brake booster having this function.

도 1에 도시한 바와 같이 일반적은 차량용 브레이크 부스터는, 프론트셀(1a)과 리어셀(1b)이 밀폐 결합된 케이싱(1)과, 이 케이싱(1) 내부를 프론트실(2a)(2b)과 리어실(2c)(2d)로 구획하는 센터플레이트(1c), 일단은 센터플레이트(1c)의 중심부를 미끄럼 가능하게 관통하며 타단은 리어셀(1b)의 개구된 중심부를 통해 외부로 돌출되게 장착되어 공기유입을 제어하는 밸브본체(6), 브레이크 페달(미도시)에 의해 연동하는 입력축(4)과 이의 작동에 따라 변위의 힘을 전달받는 출력축(5)을 구비한다.As shown in FIG. 1, a general vehicle brake booster includes a casing 1 in which the front cell 1a and the rear cell 1b are hermetically coupled to each other, and the inside of the casing 1 is a front seal 2a (2b). And a center plate 1c partitioned into a rear chamber 2c and 2d, one end of which slidably penetrates the center of the center plate 1c, and the other end of which protrudes outward through the opened center of the rear cell 1b. It is provided with a valve body (6) mounted to control the air inlet, an input shaft (4) to be interlocked by a brake pedal (not shown) and an output shaft (5) receiving a displacement force in accordance with its operation.

프론트실(2a)(2b)은 프론트다이아프램(3a)과 프론트파워피스톤(3b)에 의해 프론트정압실(2a)과 프론트변압실(2b)로 구획되며, 리어실(2c)(2d)은 리어다이아프램(3c)과 리어파워피스톤(3d)에 의해 리어정압실(2c)과 리어변압실(2d)로 구획된다.The front chambers 2a and 2b are divided into the front static pressure chamber 2a and the front transformer chamber 2b by the front diaphragm 3a and the front power piston 3b, and the rear chambers 2c and 2d are The rear diaphragm 3c and the rear power piston 3d are divided into the rear static pressure chamber 2c and the rear transformer chamber 2d.

밸브본체(6)는 다단으로 단차진 원통형상으로 마련되며, 일단부 외주에 프론트다이아프램(3a)과 프론트파워피스톤(3b) 및 리어다이아프램(3c)과 리어파워피스톤(3d), 그리고 센터플레이트(1c)가 결합되며, 공기흡입부(6c)가 형성된 타단부는 리어셀(1b)의 중심부를 관통하여 대기와 연통된다. 상기 프론트파워피스톤(3b)에는 밸브본체(6)와 닿는 부분이 지지부(3e)가 구부러져서 밸브본체(6)와 결합된다. The valve body 6 is provided in a multi-stage, stepped cylindrical shape and has a front diaphragm 3a, a front power piston 3b, a rear diaphragm 3c, a rear power piston 3d, and a center at one end of the outer periphery. The plate 1c is coupled, and the other end where the air intake 6c is formed passes through the center of the rear cell 1b and communicates with the atmosphere. The front part of the power piston (3b) is in contact with the valve body 6, the support portion (3e) is bent and coupled to the valve body (6).                         

이러한 밸브본체(6)의 내부에는 정압실(2a)(2c)과 변압실(2b)(2d)을 연통하는 정압통로(6a) 및 대기와 변압실(2b)(2d)을 연통시키는 변압통로(6b)가 형성되며, 입력축(4)의 단부와 결합되어 축방향으로 미끄럼운동하는 제 1 플런저(9)가 마련된다. 제 1 플런저(9)의 선단에 소정간격 진퇴운동 가능하게 제 2 플런저(8)가 설치된다. 그리고, 출력축(5)과 제 2 플런저(8)의 선단 사이에는 단면적의 차이로 인해 작용받은 힘을 배가시켜 출력축에 전달하는 리액션디스크(7)가 마련된다. 미설명부호 6d는 입력축(4)의 작동에 따라 공기의 유입을 제어하도록 밸브본체(6)내에 설치된 탄성재질의 포펫밸브로서, 포펫밸브(6d)에 의해 정압통로(6a)와 변압통로(6b)가 선택적으로 개폐된다.Inside the valve body 6, a pressure passage 6a communicating with the constant pressure chambers 2a and 2c and the transformer chambers 2b and 2d, and a transformer passage communicating with the atmosphere and the transformer chamber 2b and 2d. 6b is formed, and is provided with a first plunger 9 which is engaged with the end of the input shaft 4 and slides in the axial direction. The second plunger 8 is provided at the tip of the first plunger 9 so as to be able to move forward and backward at a predetermined interval. A reaction disk 7 is provided between the output shaft 5 and the tip of the second plunger 8 to double the force applied due to the difference in the cross-sectional area and transmit it to the output shaft. Reference numeral 6d is an elastic poppet valve installed in the valve body 6 to control the inflow of air according to the operation of the input shaft 4, and the positive pressure passage 6a and the transformer passage 6b by the poppet valve 6d. ) Is selectively opened and closed.

다음에는 이와같이 구성된 종래 차량용 브레이크 부스터의 작동을 설명한다.Next, the operation of the conventional vehicle brake booster configured as described above will be described.

먼저, 운전자가 브레이크 페달을 밟지 않은 경우 각각의 정압실(2a)(2c)과 변압실(2b)(2d)은 부압원에 진공상태로 유지된다. 이러한 상태에서 운전자가 브레이크 페달을 밟으면 입력축(4)이 전진하여 제 1 플런저(9)가 밀리게 되고, 이로인해 제 2 플런저(8)의 선단이 리액션디스크(7)를 직접적으로 밀게된다. 아울러 플런저(8,9)의 이동에 의해 변압통로(6b)가 외기와 연통됨으로써, 외부공기가 변압통로(6b)를 통해 각 변압실(2b)(2d)로 유입된다. 외부공기는 차압에 의해 순간적으로 유입됨으로써, 각각의 다이아프램(3a)(3c)과 파워피스톤(3b)(3d) 및 밸브본체(6)가 정압실(2a)(2c)측으로 밀리게 되고, 입력보다 증폭된 출력이 리액션디스크(7)와 출력축(5)을 통해 마스터실린더어셈블리(미도시)로 전달되어 제동유압을 발생시킨다. First, when the driver does not press the brake pedal, each of the positive pressure chambers 2a and 2c and the transformer chambers 2b and 2d is kept in a vacuum state at the negative pressure source. In this state, when the driver presses the brake pedal, the input shaft 4 moves forward, causing the first plunger 9 to be pushed, thereby causing the tip of the second plunger 8 to directly push the reaction disk 7. In addition, the transformer passage 6b communicates with the outside air by the movement of the plungers 8 and 9, so that external air flows into the transformer chambers 2b and 2d through the transformer passage 6b. As the external air is instantaneously introduced by the differential pressure, each of the diaphragms 3a, 3c, the power pistons 3b, 3d, and the valve body 6 is pushed toward the positive pressure chambers 2a, 2c, The output amplified from the input is transmitted to the master cylinder assembly (not shown) through the reaction disk 7 and the output shaft 5 to generate the braking hydraulic pressure.                         

이때, 부스터의 힘을 발생시키는 파워피스톤(3b,3d)은 밸브본체(6)에 의해 지지되는데 이때 지지부(3e)의 구부러짐이 어느정도 응력의 집중을 해소하지만, 지지부에 지속적인 하중이 가해져서 밸브본체(6)의 내구성의 저하를 가져오게 된다. At this time, the power pistons 3b and 3d, which generate the booster force, are supported by the valve body 6, in which the bending of the support part 3e eliminates the concentration of stress to some extent, but due to the continuous load on the support part, This results in a decrease in durability of (6).

이러한 문제점을 해결하기 위해서, 본 발명의 차량용 브레이크 부스터는 다이아프램의 플레이트의 밸브본체 지지부를 변형하여 밸브본체의 내구성의 증대를 꾀할수 있는 차량용 브레이크 부스터를 제공하는 것이다. In order to solve this problem, the vehicle brake booster of the present invention is to provide a vehicle brake booster that can increase the durability of the valve body by modifying the valve body support of the plate of the diaphragm.

이러한 목적을 달성하기 위한 본 발명은;The present invention for achieving this object is;

프론트셀과 리어셀이 밀폐 결합된 케이싱, 케이싱 내부를 정압실과 변압실로 구획하는 파워피스톤과 다이아프램, 일단외주에 파워피스톤과 다아아프램의 중심부가 밀폐 결합되며, 타단이 리어셀을 관통하여 대기와 연통된 밸브본체, 밸브본체의 일단 내부에 축방향으로 마련된 실린더홀에 진퇴운동 가능하게 설치되어 변압실로의 공기유입을 제어하는 제 1, 제 2 플런저, 일단이 제 1 플런저에 결합되고 타단은 브레이크 패달과 연계된 입력축, 입력축이 전진하는 경우 파워피스톤과 다이아프램 변위의 힘을 전달받도록 밸브본체의 일단 중심부에 리액션 디스크를 개재하여 접하도록 배치된 출력축을 갖춘 차량용 브레이크 부스터에 있어서,The casing with the front cell and the rear cell sealed, the power piston and diaphragm dividing the inside of the casing into the positive pressure chamber and the transformer chamber, and the center of the power piston and the diaphragm are sealed at one end, and the other end penetrates the rear cell The first and second plungers, one end of which is connected to the first plunger and the other end is installed to be capable of moving forward and backward in a cylinder hole provided in the axial direction inside one end of the valve body and in communication with the first body. In a brake booster for a vehicle having an input shaft associated with a brake pedal and an output shaft disposed at a center of one end of the valve body via a reaction disk to receive the force of the power piston and the diaphragm displacement when the input shaft moves forward,

상기 밸브본체와 접하는 상기 프론트파워피스톤의 밸브본체 지지부가(foldin g)되어 마련하는 것을 기술적인 특징으로 한다. Technical features of the present invention provide a valve body support portion (foldin g) of the front power piston in contact with the valve body.

이하, 본 발명에 따른 하나의 바람직한 실시 예를 첨부도면을 참조하여 상세 히 설명한다. Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

도 3 을 참조하면, 본 발명에 따른 차량용 브레이크 부스터는 프런트셀(11)과 리어셀(11b)이 밀폐결합된 케이싱(11), 케이싱(11) 내부를 프론트실(12a,12b)과 리어실(12c,12d)로 구획하는 센터플레이트(11c), 센터플레이트(11c)의 중심부를 자유롭게 미끄러져 움직이도록 관통하여 배치되며 프론트실(12a,12b)과 리어실(12c,12d)로의 공기유입을 제어하는 밸브본체(16), 브레이크페달(미도시) 조작에 의해 밸브본체(16)를 작동시키는 입력축(14)과 배가된 힘을 전달받도록 고무재질의 리액션디스크(17)가 설치된 출력축(25)을 구비한다. 프론트실(12a,12b)은 프론트셀(11)과 센터플레이트(11c)사이의 공간에 형성되는데, 이것은 프론트다이아프램(13a)과 프론트파워피스톤(13b)에 의해 또다시 프론트정압실(12a)과 프론트변압실(12b)로 구획된다. 그리고 프론트정압실(12a)내부에는 밸브본체(16)를 복원시키는 복원스프링(21)이 설치되며, 프론트셀(11)의 외벽에는 프론트정압실(12a)과 부압원을 연통시키는 진공연결관이 장착된다. 또한 리어실(12c,12d)은 센터플레이트(11c)와 리어셀(11b)사이의 공간에 형성되며, 이것 역시 리어다이아프램(13c)과 리어파워피스톤(13d)에 의해 리어정압실(12c)과 리어변압실(12d)로 나뉘어진다.Referring to FIG. 3, the vehicle brake booster according to the present invention includes a casing 11 in which the front cell 11 and the rear cell 11b are hermetically coupled to each other, and the inside of the casing 11 with the front chambers 12a and 12b and the rear chamber. Center plate 11c, which is divided into 12c and 12d, penetrates through the center of the center plate 11c so as to slide freely, and air flows into the front chambers 12a and 12b and the rear chambers 12c and 12d. An output shaft 25 in which a rubber body reaction disk 17 is installed to control the valve body 16 to control and the input shaft 14 to operate the valve body 16 by a brake pedal (not shown). It is provided. The front chambers 12a and 12b are formed in the space between the front cell 11 and the center plate 11c, which are again formed by the front diaphragm 13a and the front power piston 13b. And front transformer chamber 12b. In addition, a restoring spring 21 for restoring the valve body 16 is installed in the front positive pressure chamber 12a, and a vacuum connection pipe for communicating the negative pressure source 12a with the negative pressure source is provided on the outer wall of the front cell 11. Is mounted. In addition, the rear chambers 12c and 12d are formed in the space between the center plate 11c and the rear cell 11b, which are also formed by the rear diaphragm 13c and the rear power piston 13d. And rear transformer chamber 12d.

그리고, 밸브본체(16)는 다단으로 단차진 원통형상으로 마련되며, 일단 외주의 단차부위에는 프론트다이아프램(13a)과 프론트파워피스톤(13b)이 끼워져 결합되며, 상기 밸브본체(16)에 끼워지는 프론트파워피스톤(13b)의 밸브본체 지지부(13e)는 folding되어 상기 밸브본체(16)를 지지하도록 마련된다. 프론트다이아프램(13a)과 프론트파워피스톤(13b)이 결합된 부위와 소정의 간격을 두고 센터플레이트(11c) 가 끼워져 결합되며, 리어다이아프램(13c)과 리어파워피스톤(13d)역시 상기 밸브본체(16)에 끼워져 결합된다. 공기흡입부(16c)가 마련된 상기 밸브본체(16)의 타단은 리어셀(11b)의 중심부를 관통하여 외기와 연통된다. Then, the valve body 16 is provided in a multi-stage stepped cylindrical shape, the front diaphragm (13a) and the front power piston (13b) is fitted and coupled to the step portion of the outer periphery once, fitted to the valve body (16) The valve body support portion 13e of the front power piston 13b is folded and is provided to support the valve body 16. The center plate 11c is fitted to the front diaphragm 13a and the front power piston 13b at a predetermined interval, and the rear diaphragm 13c and the rear power piston 13d are also coupled to the valve body. (16) is fitted and combined. The other end of the valve body 16 provided with the air intake 16c passes through the center of the rear cell 11b and communicates with the outside air.

또한, 밸브본체(16) 내부에는 정압실(12a,12c)과 변압실(12b,12d)을 연통시키는 정압통로(16a)와 변압실(12b,12d)과 외기를 연통시키는 변압통로(16b) 및 일단 중심부에 축방향으로 실린더홀(20)이 형성되어 있다. 실린더홀(20)에는 입력축(14)의 단부와 연계되어 축방향으로 미끄럼운동하는 제 1 플런저(18b)가 설치되며, 밸브본체(16) 내부에는 입력축(14)의 작동에 의해 공기의 유입을 실질적으로 제어하는 탄성재질의 포펫밸브(22)가 설치된다.In addition, the valve body 16 has a constant pressure passage 16a for communicating the constant pressure chambers 12a and 12c and the transformer chambers 12b and 12d, and a transformer passage 16b for communicating the outside air with the transformer chambers 12b and 12d. And a cylinder hole 20 is formed at the central portion in the axial direction. The cylinder hole 20 is provided with a first plunger 18b sliding in the axial direction in association with an end of the input shaft 14, and inflow of air by the operation of the input shaft 14 inside the valve body 16. An elastic poppet valve 22 that is substantially controlled is installed.

또한 포펫밸브(22)와 조합하여 진공밸브기능을 수행하도록 밸브본체(16)내주에는 제 1 밸브시트부(22a)가 마련되어 있어서, 포펫밸브(22)선단이 제 1 밸브시트부(22a)에 안착되면 정압통로(16a)는 폐쇄되게 된다. 그리고 포펫밸브(22)와 조합하여 에어밸브기능을 수행하도록 제 1 플런저(18b)의 후단부에는 제 2 밸브시트부(22b)가 마련되어 있어서, 포펫밸브(22)선단이 제 2 밸브시트부(22b)에 안착되면 외기가 변압실(12b,12d)로 유입되는 것을 차단하게 된다.In addition, a first valve seat portion 22a is provided at the inner circumference of the valve body 16 to perform a vacuum valve function in combination with the poppet valve 22, so that the tip of the poppet valve 22 is connected to the first valve seat portion 22a. When seated, the positive pressure passage 16a is closed. A second valve seat portion 22b is provided at the rear end of the first plunger 18b so as to perform an air valve function in combination with the poppet valve 22, so that the tip of the poppet valve 22 has a second valve seat portion ( When it is seated in 22b), the outside air is blocked from flowing into the transformer chambers 12b and 12d.

도 4를 참조하면, 다단으로 단차지며 원통형상으로 마련된 밸브본체(16)의 단차부위에 파워피스톤(13b)의 밸브본체 지지부(13e)가 결합되는데, 상기 밸브본체 지지부(13e)는 folding되어 마련된다. 상기 파워피스톤(13b)의 일측에는 다이아프램(13a)이 끼워져 마련되며, 상기 파워피스톤(13b)과 다이아프램(13a)의 결합된 단차부와 소정의 간격을 두고 센터플레이트(11c)가 마련된다.Referring to FIG. 4, the valve body support portion 13e of the power piston 13b is coupled to the stepped portion of the valve body 16 provided in a multi-stepped and cylindrical shape, and the valve body support portion 13e is provided to be folded. do. One side of the power piston 13b is provided with a diaphragm 13a inserted therein, and a center plate 11c is provided at a predetermined distance from the stepped portion of the power piston 13b and the diaphragm 13a. .

상기 밸브본체의 지지부가 folding되어 마련됨으로써, 밸브본체에 가해지는 응력집중현상을 피함으로써 내구성의 증대를 꾀할수 있는 작용효과가 있다. Since the supporting part of the valve body is provided to be folded, there is an effect of increasing the durability by avoiding the stress concentration phenomenon applied to the valve body.

Claims (1)

프론트셀과 리어셀이 밀폐 결합된 케이싱, 케이싱 내부를 정압실과 변압실로 구획하는 파워피스톤과 다이아프램, 일단외주에 파워피스톤과 다아아프램의 중심부가 밀폐 결합되며, 타단이 리어셀을 관통하여 대기와 연통된 밸브본체, 밸브본체의 일단 내부에 축방향으로 마련된 실린더홀에 진퇴운동 가능하게 설치되어 변압실로의 공기유입을 제어하는 제 1, 제 2 플런저, 일단이 제 1 플런저에 결합되고 타단은 브레이크 패달과 연계된 입력축, 입력축이 전진하는 경우 파워피스톤과 다이아프램 변위의 힘을 전달받도록 밸브본체의 일단 중심부에 리액션 디스크를 개재하여 접하도록 배치된 출력축을 갖춘 차량용 브레이크 부스터에 있어서,The casing with the front cell and the rear cell sealed, the power piston and diaphragm dividing the inside of the casing into the positive pressure chamber and the transformer chamber, and the center of the power piston and the diaphragm are sealed at one end, and the other end penetrates the rear cell The first and second plungers, one end of which is connected to the first plunger and the other end is installed to be capable of moving forward and backward in a cylinder hole provided in the axial direction inside one end of the valve body and in communication with the first body. In a brake booster for a vehicle having an input shaft associated with a brake pedal and an output shaft disposed at a center of one end of the valve body via a reaction disk to receive the force of the power piston and the diaphragm displacement when the input shaft moves forward, 상기 밸브본체와 접하는 상기 프론트파워피스톤의 밸브본체지지부는 folding되어 마련되는 것을 특징으로 하는 차량용 브레이크 부스터.Brake booster for a vehicle, characterized in that the valve body support portion of the front power piston in contact with the valve body is provided folded.
KR1020030030816A 2003-05-15 2003-05-15 Car brake booster Expired - Fee Related KR100655466B1 (en)

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