KR101178058B1 - Brake booster - Google Patents

Brake booster Download PDF

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Publication number
KR101178058B1
KR101178058B1 KR1020070030405A KR20070030405A KR101178058B1 KR 101178058 B1 KR101178058 B1 KR 101178058B1 KR 1020070030405 A KR1020070030405 A KR 1020070030405A KR 20070030405 A KR20070030405 A KR 20070030405A KR 101178058 B1 KR101178058 B1 KR 101178058B1
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KR
South Korea
Prior art keywords
master cylinder
front shell
receiving groove
sealing member
brake booster
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KR1020070030405A
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Korean (ko)
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KR20080088056A (en
Inventor
김수학
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주식회사 만도
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Priority to KR1020070030405A priority Critical patent/KR101178058B1/en
Publication of KR20080088056A publication Critical patent/KR20080088056A/en
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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
    • B60T13/565—Vacuum systems indirect, i.e. vacuum booster units characterised by being associated with master cylinders, e.g. integrally formed
    • 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
    • B60T13/57—Vacuum systems indirect, i.e. vacuum booster units characterised by constructional features of control valves

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

Abstract

실링부재의 결합을 위한 수용홈을 제조가 용이한 배력장치 쪽에 마련함으로써 마스터실린더의 제조공정을 단순화할 수 있도록 하고, 이를 통해 마스터실린더의 제조비용을 줄일 수 있도록 한 브레이크 배력장치를 개시한다. 이 배력장치는 마스터실린더와 결합되는 전방쉘을 포함하며, 전방쉘에는 마스터실린더와 전방쉘 사이에 개재되는 실링부재의 일부가 수용될 수 있도록 그 표면으로부터 함몰되도록 성형된 수용홈이 마련된 것이다.By providing a receiving groove for coupling the sealing member on the side of the easy power manufacturing device to facilitate the manufacturing process of the master cylinder, through which the brake power supply device to reduce the manufacturing cost of the master cylinder is disclosed. The boosting device includes a front shell coupled to the master cylinder, and the front shell is provided with a receiving groove formed to be recessed from the surface so that a part of the sealing member interposed between the master cylinder and the front shell can be accommodated.

Description

브레이크 배력장치{BRAKE BOOSTER}Brake booster {BRAKE BOOSTER}

도 1은 종래 브레이크 배력장치와 마스터실린더의 구성을 나타낸 단면도이다.1 is a cross-sectional view showing the configuration of a conventional brake booster and a master cylinder.

도 2는 본 발명에 따른 브레이크 배력장치와 마스터실린더의 구성을 나타낸 단면도이다.2 is a cross-sectional view showing the configuration of the brake booster and the master cylinder according to the present invention.

* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

30: 배력장치 31: 전방쉘30: booster 31: front shell

32: 후방쉘 35: 정압실32: rear shell 35: constant pressure chamber

36: 변압실 40: 밸브본체36: transformer chamber 40: valve body

41: 출력축 50: 마스터실린더41: output shaft 50: master cylinder

51: 실린더본체 54: 플랜지51: cylinder body 54: flange

60: 실링부재 61: 수용홈60: sealing member 61: receiving groove

본 발명은 브레이크 배력장치에 관한 것으로, 더욱 상세하게는 마스터실린더와 결합되는 전방쉘에 실링부재 수용부가 마련된 브레이크 배력장치에 관한 것이 다.The present invention relates to a brake booster, and more particularly, to a brake booster provided with a sealing member receiver in a front shell coupled to a master cylinder.

브레이크의 배력장치는 운전자가 브레이크페달을 가압하는 힘보다 큰 힘을 발생시켜 이 힘으로 마스터실린더를 가압함으로써 큰 제동력을 발휘할 수 있도록 하는 장치이다. The brake booster is a device that generates a greater force than the driver presses the brake pedal to press the master cylinder with this force to exert a large braking force.

도 1에 도시한 바와 같이, 이러한 배력장치(10)의 전면에는 차량의 제동을 위한 액압을 발생시키는 마스터실린더(20)가 결합된다. 즉 마스터실린더(20)는 실린더본체(21)의 후단이 배력장치(10)의 전방쉘(11) 내부로 진입하는 형태로 결합되고, 그 외면에 형성된 플렌지(22)가 전방쉘(11)에 마련된 고정볼트(12)에 체결됨으로써 고정된다. 이러한 결합에 의해 배력장치(10)의 출력축(13)은 마스터실린더(20)의 피스톤(23)을 가압할 수 있게 된다.As shown in FIG. 1, a master cylinder 20 for generating hydraulic pressure for braking of the vehicle is coupled to the front of the power booster 10. That is, the master cylinder 20 is coupled in such a way that the rear end of the cylinder body 21 enters the inside of the front shell 11 of the power unit 10, and the flange 22 formed on the outer surface thereof is connected to the front shell 11. It is fixed by being fastened to the provided fixing bolt 12. By this coupling, the output shaft 13 of the power booster 10 can press the piston 23 of the master cylinder 20.

배력장치(10)의 전방쉘(11)과 마스터실린더(20)의 실린더본체(21)가 결합되는 부분에는 배력장치 전방쉘(11) 내부의 기밀이 유지될 수 있도록 오링형태의 실링부재(15)가 개재된다. 실링부재(15)는 마스터실린더의 플렌지(22)에 형성된 수용홈(25)에 그 일부가 진입하는 형태로 결합된다. O-ring type sealing member 15 to maintain the airtight inside the power unit front shell 11 in the portion where the front shell 11 and the cylinder body 21 of the master cylinder 20 is coupled to the power unit 10. ) Is interposed. The sealing member 15 is coupled in such a way that a part thereof enters the receiving groove 25 formed in the flange 22 of the master cylinder.

그러나 이러한 배력장치(10)와 마스터실린더(20)의 결합구조는 실링부재(15)의 결합을 위해 마스터실린더(20)의 플렌지(22)에 수용홈(25)을 형성시켜야 하기 때문에 마스터실린더(20)의 제조를 어렵게 하는 문제가 있었다. 즉 통상적으로 마스터실린더(20)는 실린더본체(21)를 주물성형을 통해 제조한 후, 내면의 보어(24)와 플렌지(22) 표면 등을 절삭가공 한다. 그런데 이러한 방식으로 마스터실린더(20)를 제조하는 과정에서 실링부재(15)의 장착을 위한 수용홈(25)의 형성을 위 해 부가적인 절삭가공 공정을 거쳐야 하기 때문에 마스터실린더(20)의 제조가 어려울 뿐 아니라 제조비용이 상승할 수 있었다.However, the coupling structure of the power booster 10 and the master cylinder 20 has to form the receiving groove 25 in the flange 22 of the master cylinder 20 for the coupling of the sealing member 15, the master cylinder ( 20) there was a problem of making the production difficult. That is, the master cylinder 20 is usually manufactured by casting the cylinder body 21, and then cut the surface of the bore 24 and the flange 22 of the inner surface. However, in the process of manufacturing the master cylinder 20 in this manner, the manufacture of the master cylinder 20 is required because an additional cutting process is required to form the receiving groove 25 for mounting the sealing member 15. Not only was it difficult, but manufacturing costs could rise.

본 발명은 이와 같은 문제점을 해결하기 위한 것으로, 본 발명의 목적은 실링부재의 결합을 위한 수용홈을 제조가 용이한 배력장치 쪽에 마련함으로써 마스터실린더의 제조공정을 단순화할 수 있도록 하고, 이를 통해 마스터실린더의 제조비용을 줄일 수 있도록 하는 브레이크 배력장치를 제공하는 것이다.The present invention is to solve such a problem, an object of the present invention to simplify the manufacturing process of the master cylinder by providing a receiving groove for the coupling of the sealing member on the side of the power supply easy to manufacture, thereby master It is to provide a brake boosting device that can reduce the manufacturing cost of the cylinder.

이러한 목적을 달성하기 위한 본 발명에 따른 브레이크 배력장치는 마스터실린더와 결합되는 전방쉘을 포함하며, 상기 전방쉘에는 상기 마스터실린더와 상기 전방쉘 사이에 개재되는 실링부재의 일부가 수용될 수 있도록 그 표면으로부터 함몰되도록 성형된 수용홈이 마련된 것을 특징으로 한다.The brake booster according to the present invention for achieving the above object includes a front shell coupled to the master cylinder, the front shell is to accommodate a portion of the sealing member interposed between the master cylinder and the front shell. It is characterized in that the receiving groove is formed to be recessed from the surface.

또한 상기 전방쉘은 상기 마스터실린더의 일부가 그 내부로 진입하여 결합되는 진입구를 포함하고, 상기 수용홈은 상기 전방쉘의 전면과 상기 진입구의 경계부분에 형성된 것을 특징으로 한다.In addition, the front shell includes an entrance port through which a part of the master cylinder enters and is coupled thereto, and the receiving groove is formed at a boundary between the front surface of the front shell and the entrance port.

또한 상기 수용홈은 금속판재의 프레스성형에 의해 상기 전방쉘을 성형하는 과정에서 함께 성형되는 것을 특징으로 한다.In addition, the receiving groove is characterized in that it is molded together in the process of forming the front shell by the press molding of the metal plate.

이하에서는 본 발명에 따른 바람직한 실시 예를 첨부 도면을 참조하여 상세히 설명한다. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 2에 도시한 바와 같이, 본 발명에 따른 배력장치(30)는 테두리부가 상호 결합되어 밀폐공간을 형성하는 전방쉘(31)과 후방쉘(32)을 구비하고, 전방쉘(31)과 후방쉘(32)의 내부는 동력피스톤(33)과 다이어프램(34)에 의하여 전방의 정압실(35)과 후방의 변압실(36)로 구획된다.As shown in FIG. 2, the power supply apparatus 30 according to the present invention includes a front shell 31 and a rear shell 32 having edge portions coupled to each other to form a closed space, and a front shell 31 and a rear side. The inside of the shell 32 is partitioned into the forward pressure chamber 35 and the rear transformer chamber 36 by the power piston 33 and the diaphragm 34.

후방쉘(32)의 중심부에는 브레이크 페달(미도시)과 연결되는 입력축(37)의 동작에 따라 정압실(35)과 변압실(36)을 상호 연통시키거나 변압실(36)을 대기와 연통시킴으로써 정압실(35)과 변압실(36) 사이에 압력차가 생기도록 하는 밸브본체(40)가 설치된다. 또 밸브본체(40)에는 정압실(35)과 변압실(36)의 압력차에 의해 밸브본체(40)가 전진할 때 전방쉘(31) 전면에 설치된 마스터실린더(50)의 피스톤(53)을 가압하기 위한 출력축(41)이 설치된다. 여기서 밸브본체(40)의 구성 및 동작원리는 알려진 것이므로 이에 대한 구체적인 설명은 생략하기로 한다.In the center of the rear shell 32, the positive pressure chamber 35 and the transformer chamber 36 communicate with each other or the transformer chamber 36 communicates with the atmosphere according to the operation of the input shaft 37 connected to the brake pedal (not shown). By doing so, the valve body 40 is provided so as to generate a pressure difference between the constant pressure chamber 35 and the transformer chamber 36. In addition, the valve body 40 has a piston 53 of the master cylinder 50 provided on the front face of the front shell 31 when the valve body 40 moves forward due to the pressure difference between the positive pressure chamber 35 and the transformer chamber 36. An output shaft 41 for pressurizing is installed. Since the configuration and operation principle of the valve body 40 is known, a detailed description thereof will be omitted.

전방쉘(31)에 결합되는 마스터실린더(50)는 내부에 보어(52)가 형성된 실린더본체(51)와, 밸브본체(40)의 보어(52) 내부에 설치된 피스톤(53)을 구비한다. 피스톤(53)은 배력장치(30)의 출력축(41) 가압에 의해 전진하면서 마스터실린더(50) 내부에 제동을 위한 액압을 형성시키게 된다. 이러한 마스터실린더(50)의 구성 및 동작에 대해서도 널리 알려진 것이므로 이에 대한 설명은 생략하고, 이하에서는 배력장치(30)와 마스터실린더(50)의 결합구조에 관하여 상세히 설명한다.The master cylinder 50 coupled to the front shell 31 includes a cylinder body 51 having a bore 52 formed therein and a piston 53 installed inside the bore 52 of the valve body 40. The piston 53 advances by pressurizing the output shaft 41 of the booster 30 to form a hydraulic pressure for braking in the master cylinder 50. Since the configuration and operation of the master cylinder 50 is well known, the description thereof will be omitted, and hereinafter, the coupling structure of the power booster 30 and the master cylinder 50 will be described in detail.

배력장치(30)의 전방쉘(31) 중심부에는 마스터실린더(20)의 실린더본체(21) 후단 일부가 정압실(35) 쪽으로 진입하여 결합될 수 있도록 진입구(38)가 형성된다. 따라서 마스터실린더(20)가 전방쉘(31)에 장착되면 출력축(41)에 의하여 마스터실린더(50)의 피스톤(53)이 가압될 수 있게 된다. In the center of the front shell 31 of the power supply device 30, the entry port 38 is formed so that a portion of the rear end of the cylinder body 21 of the master cylinder 20 can be coupled to enter the positive pressure chamber 35. Therefore, when the master cylinder 20 is mounted to the front shell 31, the piston 53 of the master cylinder 50 can be pressed by the output shaft 41.

마스터실린더(50)의 실린더본체(51) 외면에는 배력장치(30)의 전방쉘(31)에 고정할 수 있도록 플렌지(54)가 마련되고, 플렌지(54)는 전방쉘(31)에 고정된 고정볼트들(39)에 체결된다. 즉 마스터실린더(50)는 플랜지(54)가 고정볼트들(39)에 체결됨으로써 전방쉘(31) 전면에 견고히 고정된다.A flange 54 is provided on the outer surface of the cylinder body 51 of the master cylinder 50 so as to be fixed to the front shell 31 of the booster 30, and the flange 54 is fixed to the front shell 31. It is fastened to the fixing bolts (39). That is, the master cylinder 50 is firmly fixed to the front shell 31 by the flange 54 is fastened to the fixing bolts 39.

또 마스터실린더(50)와 전방쉘(31)이 결합되는 부분에는 기밀유지를 위한 실링부재(60)가 설치된다. 실링부재(60)는 탄성을 가진 오링형태로 마련되며, 마스터실린더(50)의 플랜지(54)와 배력장치(30)의 전방쉘(31) 사이에 개재됨으로써 전방쉘(31) 내부의 정압실(35)이 밀폐될 수 있도록 한다. 이러한 실링부재(60)의 결합을 위해 전방쉘(31)의 전면과 진입구(38)의 경계부분(모서리부)에는 실링부재(60)의 일부가 수용될 수 있도록 그 표면으로부터 소정깊이 함몰된 수용홈(61)이 형성된다. In addition, the sealing member 60 for airtightness is installed at the portion where the master cylinder 50 and the front shell 31 are coupled. The sealing member 60 is provided in an O-ring shape having elasticity, and is interposed between the flange 54 of the master cylinder 50 and the front shell 31 of the power supply device 30 so that the positive pressure chamber inside the front shell 31 is provided. (35) is to be sealed. In order to couple the sealing member 60, the front surface of the front shell 31 and the boundary portion (edge portion) of the entry port 38 are recessed to a predetermined depth from the surface so that a part of the sealing member 60 can be accommodated. Groove 61 is formed.

이는 종래에 마스터실린더의 플랜지 쪽에서 형성되었던 수용홈을 배력장치의 전방쉘(31) 쪽에 형성시킴으로써 수용홈(61)의 형성에 따른 제조공정을 단순화하고 제조비용을 종래보다 줄일 수 있도록 한 것이다. This is to form a receiving groove that was formed in the flange side of the master cylinder on the front shell 31 side of the power distribution apparatus to simplify the manufacturing process according to the formation of the receiving groove 61 and to reduce the manufacturing cost than the conventional.

즉 종래에는 마스터실린더(50) 쪽에 수용홈을 형성시키기 위해 마스터실린더를 제조하는 과정에서 별도의 절삭가공공정을 추가해야 했기 때문에 마스터실린더의 제조공정이 복잡해지고 제조비용도 높아질 수 있었으나, 본 발명은 수용홈(61)을 배력장치(30)의 전방쉘(31)에 형성시킴으로써 수용홈(61)의 형성에 따른 별도의 제조공정이 필요치 않도록 한 것이다. 배력장치(30)의 전방쉘(31)은 금속판재의 프레스성형을 통하여 제조하는데, 수용홈(61)도 전방쉘(31)의 성형과정에서 함께 성 형할 수 있도록 한 것이다. 이러한 방법은 수용홈(61)의 성형을 위한 추가적인 공정이 필요치 않으면서도 종래와 동일한 정도의 실링부재 결합구조를 구현할 수 있다. 또 수용홈(61)을 배력장치(30) 쪽에 형성시킴으로써 마스터실린더(50)의 플랜지(54) 두께를 종래보다 줄일 수 있는 효과도 얻을 수 있다.That is, in the prior art, since a separate cutting process had to be added in the process of manufacturing the master cylinder to form the receiving groove on the master cylinder 50 side, the manufacturing process of the master cylinder could be complicated and the manufacturing cost could be increased. The receiving groove 61 is formed in the front shell 31 of the power supply device 30 so that a separate manufacturing process according to the formation of the receiving groove 61 is not necessary. The front shell 31 of the power boosting device 30 is manufactured through the press molding of the metal plate, the receiving groove 61 is also to be molded together in the molding process of the front shell 31. This method can implement the sealing member coupling structure of the same degree as the prior art without the need for an additional process for forming the receiving groove (61). In addition, by forming the receiving groove 61 on the power supply device 30 side, the effect of reducing the thickness of the flange 54 of the master cylinder 50 can be obtained.

이상에서 상세히 설명한 바와 같이, 본 발명에 따른 브레이크 배력장치는 전방쉘에 실링부재의 수용을 위한 수용홈을 구비하기 때문에 이에 상대하여 결합되는 마스터실린더의 구성 및 제조공정을 단순화할 수 있고, 마스터실린더의 제조비용을 줄일 수 있는 효과가 있다.As described in detail above, the brake power booster according to the present invention has a receiving groove for accommodating the sealing member in the front shell, thereby simplifying the construction and manufacturing process of the master cylinder coupled thereto, and the master cylinder It is effective to reduce the manufacturing cost of the.

또한 본 발명은 금속판재의 프레스성형을 통하여 전방쉘을 성형하는 과정에서 실링부재의 설치를 위한 수용홈을 성형할 수 있기 때문에 추가적인 제조공정이 없이도 수용홈을 성형할 수 있는 효과가 있다.In addition, the present invention has the effect of forming the receiving groove without additional manufacturing process because it can be formed in the receiving groove for the installation of the sealing member in the process of forming the front shell through the press molding of the metal plate.

Claims (3)

마스터실린더와 결합되는 전방쉘을 포함하는 브레이크 배력장치에 있어서,In the brake booster comprising a front shell coupled to the master cylinder, 상기 전방쉘 중심부에는 상기 마스터실린더의 후단 일부가 상기 전방쉘의 전면(前面)으로부터 진입하여 결합될 수 있도록 진입구가 형성되어, An entrance port is formed at the center of the front shell so that a part of the rear end of the master cylinder enters and engages from the front surface of the front shell. 상기 마스터실린더와 상기 전방쉘 사이에 개재되는 실링부재의 일부가 수용될 수 있도록 상기 전방쉘의 전면(前面)과 진입구의 경계부분에는 표면으로부터 내면방향으로 함몰되도록 성형된 수용홈이 마련된 것을 특징으로 하는 브레이크 배력장치.Receiving grooves formed to be recessed in the inner surface direction from the front surface of the front shell and the entrance portion of the front shell so that a portion of the sealing member interposed between the master cylinder and the front shell is provided Brake booster. 삭제delete 제1항에 있어서,The method of claim 1, 상기 수용홈은 상기 전방쉘을 성형시 상기 전방쉘에 형성되는 것을 특징으로 하는 브레이크 배력장치.The receiving groove is a brake booster, characterized in that formed in the front shell when forming the front shell.
KR1020070030405A 2007-03-28 2007-03-28 Brake booster KR101178058B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6429067U (en) 1987-08-14 1989-02-21
WO1990012715A1 (en) 1989-04-22 1990-11-01 Alfred Teves Gmbh Vacuum brake booster for motor vehicles

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6429067U (en) 1987-08-14 1989-02-21
WO1990012715A1 (en) 1989-04-22 1990-11-01 Alfred Teves Gmbh Vacuum brake booster for motor vehicles

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