KR100892527B1 - Brake system for a vehicle - Google Patents

Brake system for a vehicle Download PDF

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Publication number
KR100892527B1
KR100892527B1 KR1020030101230A KR20030101230A KR100892527B1 KR 100892527 B1 KR100892527 B1 KR 100892527B1 KR 1020030101230 A KR1020030101230 A KR 1020030101230A KR 20030101230 A KR20030101230 A KR 20030101230A KR 100892527 B1 KR100892527 B1 KR 100892527B1
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KR
South Korea
Prior art keywords
pistons
plunger
wheel
brake
brake system
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KR1020030101230A
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Korean (ko)
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KR20050069264A (en
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김재훈
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현대자동차주식회사
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Priority to KR1020030101230A priority Critical patent/KR100892527B1/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
    • B60T13/12—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 liquid
    • 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
    • B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
    • B60T1/02—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels
    • B60T1/06—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels
    • B60T1/065—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels employing disc
    • 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
    • B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
    • B60T1/02—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels
    • B60T1/06—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels
    • B60T1/067—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels employing drum
    • 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
    • B60T2220/00—Monitoring, detecting driver behaviour; Signalling thereof; Counteracting thereof
    • B60T2220/04—Pedal travel sensor, stroke sensor; Sensing brake request
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00—Special features of vehicle units
    • B60Y2400/81—Braking systems

Abstract

본 발명은 제동유압을 발생시키는 장치가 컴팩트한 구조로 이루어지고, 그 설치위치가 종래에 비하여 자유로워서 엔진룸의 공간 활용성을 극대화할 수 있으며, 차량의 충돌 사고시에 운전자에게 위해요소로 작용하지 않게 되며, 각 휠로 전달되는 제동압을 효율적으로 전달할 수 있도록 한다.
The present invention is a compact structure of the device for generating the braking hydraulic pressure, the installation position is free compared to the conventional can maximize the space utilization of the engine room, and does not act as a hazard to the driver in the event of a vehicle crash It is possible to efficiently transmit the braking pressure transmitted to each wheel.

Description

차량용 브레이크시스템{brake system for a vehicle}Brake system for a vehicle

도 1은 본 발명에 따른 차량용 브레이크시스템의 요부를 도시한 구조도,1 is a structural diagram showing a main part of a brake system for a vehicle according to the present invention;

도 2는 도 1과 함께 본 발명에 따른 차량용 브레이크시스템을 설명하는 구성도,2 is a configuration diagram illustrating a brake system for a vehicle according to the present invention together with FIG. 1;

도 3은 본 발명에 따른 차량용 브레이크시스템의 전체 구성도,3 is an overall configuration diagram of a vehicle brake system according to the present invention;

도 4는 유압발생유닛에서 유압을 발생하지 않는 상태를 도시한 상태도,Figure 4 is a state diagram showing a state in which no hydraulic pressure generated in the hydraulic pressure generating unit,

도 5는 유압발생유닛에서 유압을 발생시키는 상태를 도시한 상태도이다.5 is a state diagram illustrating a state in which oil pressure is generated in the oil pressure generating unit.

<도면의 주요 부분에 대한 부호의 간단한 설명><Brief description of symbols for the main parts of the drawings>

1; 피스톤 3; 실린더One; Piston 3; cylinder

5; 플런저유닛 7; 브레이크페달5; Plunger unit 7; Brake pedal

9; 브레이크센서 11; 컨트롤러9; Brake sensor 11; controller

13; 플런저 15; 플런저스프링13; Plunger 15; Plunger Spring

17; 솔레노이드코일 19; 피스톤스프링17; Solenoid coil 19; Piston spring

21; 플런저접촉경사면 23; 피스톤접촉경사면21; Plunger contact inclined surface 23; Piston Contact Slope

25; 하우징 27; 유압파이프25; A housing 27; Hydraulic pipe

본 발명은 차량용 브레이크시스템에 관한 것으로서, 보다 상세하게는 마스터실린더와 진공 배력식 브레이크 부스터를 대체하여, 보다 컴팩트한 구성으로 제동에 필요한 유압을 발생시켜 적절한 제동이 이루어질 수 있도록 하는 기술에 관한 것이다.The present invention relates to a brake system for a vehicle, and more particularly, to replace a master cylinder and a vacuum boost brake booster, to a technique for generating a hydraulic pressure required for braking in a more compact configuration to enable proper braking.

종래에는 운전자의 페달 답력을 증폭시키기 위해 진공 배력식 브레이크부스터를 장착하고, 상기 브레이크부스터에서 발생된 강한 힘으로 마스터실린더를 조작하여 제동에 필요한 제동유압을 발생시켜 각 휠의 휠실린더 또는 캘리퍼에 전달할 수 있도록 하고 있다.Conventionally, a vacuum-powered brake booster is mounted to amplify a driver's pedaling force, and a braking hydraulic pressure required for braking is generated by operating a master cylinder with a strong force generated from the brake booster to be transmitted to a wheel cylinder or a caliper of each wheel. To make it possible.

상기 진공 배력식 브레이크부스터와 마스터실린더는 차량의 엔진룸 내에 많은 공간을 차지하고, 차량의 충돌 사고시에 후방으로 밀리면서 운전자에게 상해를 입힐 수 있는 구조적인 문제점을 가지고 있다.The vacuum booster brake booster and the master cylinder occupy a lot of space in the engine room of the vehicle, and have a structural problem that may cause injury to the driver while being pushed backward in the event of a vehicle crash.

본 발명은 컴팩트한 구조로 이루어지고, 그 설치위치가 종래에 비하여 자유로워서 엔진룸의 공간 활용성을 극대화할 수 있으며, 차량의 충돌 사고시에 운전자에게 위해요소로 작용하지 않게 되며, 각 휠로 전달되는 제동압을 효율적으로 전달할 수 있도록 한 차량용 브레이크시스템을 제공함에 그 목적이 있다.The present invention is made of a compact structure, the installation position is free compared to the conventional can maximize the space utilization of the engine room, do not act as a hazard to the driver in the event of a vehicle crash, and is transmitted to each wheel An object of the present invention is to provide a brake system for a vehicle that can efficiently transmit a braking pressure.

상기한 바와 같은 목적을 달성하기 위한 본 발명 차량용 브레이크시스템은 직선 슬라이딩하는 경로의 연장선이 동일평면의 한 점에서 만나도록 구비된 4개의 피스톤과;The vehicle brake system of the present invention for achieving the above object comprises four pistons provided so that the extension line of the linear sliding path meets at one point of the same plane;

상기 피스톤의 직선 슬라이딩 운동에 의해 유압을 발생시키도록 각각 설치되어 각 휠의 제동요소에 제공하는 실린더와;Cylinders each provided to generate hydraulic pressure by a linear sliding motion of the piston and provided to brake elements of each wheel;

상기 피스톤들이 직선 슬라이딩하는 경로의 연장선이 만나는 한 점에서, 상기 피스톤들이 직선 슬라이딩하는 평면을 수직으로 관통하는 방향으로 직선이동하여, 상기 피스톤들을 직선 슬라이딩시키도록 설치된 플런저유닛과;A plunger unit arranged to linearly slide the pistons by linearly moving in a direction vertically penetrating the plane in which the pistons linearly slide at a point where an extension line of the path in which the pistons linearly slide meets;

브레이크페달의 작동상태를 감지하는 브레이크센서와;A brake sensor for detecting an operating state of the brake pedal;

상기 브레이크센서의 신호를 받아 상기 플런저유닛을 작동시키는 컨트롤러를 포함하여 구성된 것을 특징으로 한다.It characterized in that it comprises a controller for operating the plunger unit in response to the signal of the brake sensor.

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

도 1과 도 2를 참조하면, 본 발명 실시예는 직선 슬라이딩하는 경로의 연장선이 동일평면의 한 점에서 만나도록 구비된 4개의 피스톤(1)과; 상기 피스톤(1)의 직선 슬라이딩 운동에 의해 유압을 발생시키도록 각각 설치되어 각 휠의 제동요소에 제공하는 실린더(3)와; 상기 피스톤(1)들이 직선 슬라이딩하는 경로의 연장선이 만나는 한 점에서, 상기 피스톤(1)들이 직선 슬라이딩하는 평면을 수직으로 관통하는 방향으로 직선이동하여, 상기 피스톤(1)들을 직선 슬라이딩시키도록 설치된 플런저유닛(5)과; 브레이크페달(7)의 작동상태를 감지하는 브레이크센서(9)와; 상기 브레이크센서(9)의 신호를 받아 상기 플런저유닛(5)을 작동시키는 컨트롤러(11)를 포함하여 구성되어 있다. 1 and 2, an embodiment of the present invention includes four pistons (1) provided so that an extension line of a straight sliding path meets at a point on the same plane; Cylinders (3) each provided to generate hydraulic pressure by a linear sliding motion of the piston (1) and provided to the braking elements of each wheel; At a point where an extension line of a path in which the pistons 1 linearly slide meets, the pistons 1 are installed to linearly slide the pistons 1 by linearly moving in a direction vertically penetrating the plane in which they linearly slide. A plunger unit 5; A brake sensor 9 for detecting an operating state of the brake pedal 7; It is configured to include a controller 11 for receiving the signal of the brake sensor 9 to operate the plunger unit (5).                     

상기 플런저유닛(5)은 정점이 상기 피스톤(1)들의 직선 슬라이딩 경로의 연장선의 교차점을 향하는 4각뿔로 형성된 플런저(13)와, 상기 플런저(13)가 상기 피스톤(1)들로부터 이격되는 방향으로 탄성 지지하는 플런저스프링(15)과, 상기 플런저(13)가 상기 피스톤(1)들을 향해 이동하도록 하는 힘을 발생시키는 솔레노이드코일(17)을 포함하여 구성된다.The plunger unit 5 has a plunger 13 formed of a quadrangular pyramid whose vertex faces an intersection of an extension line of a straight sliding path of the pistons 1, and a direction in which the plunger 13 is spaced apart from the pistons 1. And a solenoid coil 17 for generating a force for causing the plunger spring 15 to elastically support and the plunger 13 to move toward the pistons 1.

상기 피스톤(1)들은 서로 한 점에서 모이는 방향으로 탄성 지지되도록 각각 피스톤스프링(19)에 의해 탄지되고, 상기 피스톤(1)들은 상기 플런저(13)의 4개의 경사면 중 하나와 각각 면접촉 하도록 플런저접촉경사면(21)을 구비하고, 상기 피스톤들은 서로서로 인접한 면이 면접촉하도록 피스톤접촉경사면(23)을 구비하고 있다.The pistons 1 are respectively supported by the piston springs 19 so as to be elastically supported in the direction of gathering at one point with each other, and the pistons 1 are each in surface contact with one of the four inclined surfaces of the plunger 13. A contact inclined surface 21 is provided, and the pistons are provided with a piston contact inclined surface 23 such that surfaces adjacent to each other are in surface contact with each other.

한편, 상기 각 휠의 제동요소는 드럼식브레이크의 휠실린더(3)이거나, 디스크식브레이크의 캘리퍼실린더(3) 중 어느 것이나 사용될 수 있다.On the other hand, the braking element of each wheel may be a wheel cylinder (3) of the drum brake, or any one of the caliper cylinder (3) of the disc brake.

상기 플런저유닛(5)과 피스톤과 실린더(3)들은 하나의 하우징(25)에 장착되어 상기한 바와 같은 각각의 동작을 구현하도록 하는 것이 바람직하며, 상기 하우징(25)은 반드시 엔진룸이 아니라도 차체의 어느 곳이든 설치될 수 있다. The plunger unit 5 and the piston and the cylinders 3 are preferably mounted in one housing 25 to implement the respective operations as described above, and the housing 25 is not necessarily an engine room. It can be installed anywhere on the body.

즉, 상기 하우징(25)은 전륜과 후륜의 제동요소들에 동일한 제동압을 공급할 수 있도록 차체의 중앙에 설치되거나, 전륜과 후륜의 제동압의 차이를 상기 실린더(3)와 각 휠의 제동요소들 사이를 연결하는 유압파이프(27)의 길이에 의해 구현하도록 차체의 전방이나 후방으로 치우쳐진 위치에 설치할 수도 있는 것이다.That is, the housing 25 is installed at the center of the vehicle body so as to supply the same braking pressure to the braking elements of the front wheel and the rear wheel, or the braking element of the cylinder 3 and each wheel is different from the braking pressure difference between the front wheel and the rear wheel. It may be installed in a position biased toward the front or rear of the vehicle body to be implemented by the length of the hydraulic pipe 27 connecting between them.

한편, 상기 브레이크센서(9)는, 운전자의 답력을 측정할 수 있는 로드셀(LOAD CELL) 등이 사용될 수 있다.On the other hand, the brake sensor 9, a load cell (LOAD CELL) that can measure the driver's pedaling force may be used.

상기한 바와 같이 구성된 본 발명의 작용을 설명하면 다음과 같다.Referring to the operation of the present invention configured as described above are as follows.

운전자가 브레이크페달(7)을 밟으면, 브레이크페달(7)이 밟힌 정도가 상기 브레이크센서(9)에 의해 감지되고, 상기 컨트롤러(11)는 상기 브레이크센서(9)의 신호를 받아 브레이크페달(7)이 밟힌 정도에 따라 상기 플런저유닛(5)의 솔레노이드코일(17)에 전력을 공급한다.When the driver steps on the brake pedal 7, the brake pedal 7 is sensed by the brake sensor 9, and the controller 11 receives the signal of the brake sensor 9 to receive the brake pedal 7. The electric power is supplied to the solenoid coil 17 of the plunger unit 5 according to the stepped step).

따라서, 상기 플런저(13)는 상기 피스톤(1)들을 향하여 전진하여, 상기 피스톤(1)들을 밀쳐내게 된다.Thus, the plunger 13 is advanced toward the pistons 1 to push the pistons 1 out.

상기 피스톤(1)들은 4방으로 벌어지면서, 각각의 실린더(3)내에 채워져 있는 오일을 가압하여, 유압을 발생시키며, 상기와 같이 발생된 유압은 유압파이프(27)에 의해 각 휠의 제동요소에 공급되어, 원하는 제동력이 발생되게 한다.
The pistons 1 open in four directions, pressurizing the oil filled in each cylinder 3 to generate hydraulic pressure, and the hydraulic pressure generated as described above is brake element of each wheel by the hydraulic pipe 27. Is supplied to cause the desired braking force to be generated.

이상과 같이 구성되어 작동되는 브레이크시스템은 운전자의 브레이크페달(7) 답력을 증폭시키기 위한 진공 배력식 브레이크부스터 및 마스터실린더(3)를 사용하지 않으면서도, 운전자의 브레이크페달(7) 조작에 따라 적절한 제동압을 각 휠의 제동요소에 원활하게 공급하게 된다.The brake system configured and operated as described above is suitable for operating the brake pedal 7 of the driver without using the vacuum booster booster and the master cylinder 3 to amplify the driver's brake pedal force. The braking pressure is smoothly supplied to the braking elements of each wheel.

상기한 바와 같이 본 발명에 의하면, 제동유압을 발생시키는 장치가 컴팩트한 구조로 이루어지고, 그 설치위치가 종래에 비하여 자유로워서 엔진룸의 공간 활용성을 극대화할 수 있으며, 차량의 충돌 사고시에 운전자에게 위해요소로 작용하 지 않게 되며, 각 휠로 전달되는 제동압을 효율적으로 전달할 수 있도록 한다. As described above, according to the present invention, a device for generating braking hydraulic pressure has a compact structure, and its installation position is free compared with the prior art, thereby maximizing the space utilization of the engine room, and in the event of a vehicle crash. It does not act as a hazard, and it can efficiently transmit the braking pressure to each wheel.                     

Claims (5)

직선 슬라이딩하는 경로의 연장선이 동일평면의 한 점에서 만나도록 구비된 4개의 피스톤과;Four pistons provided such that the extension lines of the linear sliding paths meet at one point on the same plane; 상기 피스톤의 직선 슬라이딩 운동에 의해 유압을 발생시키도록 각각 설치되어 각 휠의 제동요소에 제공하는 실린더와;Cylinders each provided to generate hydraulic pressure by a linear sliding motion of the piston and provided to brake elements of each wheel; 상기 피스톤들이 직선 슬라이딩하는 경로의 연장선이 만나는 한 점에서, 상기 피스톤들이 직선 슬라이딩하는 평면을 수직으로 관통하는 방향으로 직선이동하여, 상기 피스톤들을 직선 슬라이딩시키도록 설치된 플런저유닛과;A plunger unit arranged to linearly slide the pistons by linearly moving in a direction vertically penetrating the plane in which the pistons linearly slide at a point where an extension line of the path in which the pistons linearly slide meets; 브레이크페달의 작동상태를 감지하는 브레이크센서와;A brake sensor for detecting an operating state of the brake pedal; 상기 브레이크센서의 신호를 받아 상기 플런저유닛을 작동시키는 컨트롤러;A controller configured to operate the plunger unit in response to a signal of the brake sensor; 로 구성된 것을 특징으로 하는 차량용 브레이크시스템.Vehicle brake system, characterized in that consisting of. 제1항에 있어서, 상기 플런저유닛은 The method of claim 1, wherein the plunger unit 정점이 상기 피스톤들의 직선 슬라이딩 경로의 연장선의 교차점을 향하는 4각뿔로 형성된 플런저와;A plunger formed of a quadrangular pyramid whose vertex faces an intersection of an extension line of the linear sliding path of the pistons; 상기 플런저가 상기 피스톤들로부터 이격되는 방향으로 탄성 지지하는 플런저스프링과;A plunger spring elastically supporting the plunger in a direction away from the pistons; 상기 플런저가 상기 피스톤들을 향해 이동하도록 하는 힘을 발생시키는 솔레노이드코일;A solenoid coil generating a force for causing the plunger to move toward the pistons; 을 포함하여 구성된 것을 특징으로 하는 차량용 브레이크시스템.Vehicle brake system, characterized in that configured to include. 제2항에 있어서,The method of claim 2, 상기 피스톤들은 서로 한 점에서 모이는 방향으로 탄성 지지되도록 각각 피스톤스프링에 의해 탄지되고, The pistons are each supported by piston springs so as to be elastically supported in the direction of gathering at one point with each other, 상기 피스톤들은 상기 플런저의 4개의 경사면 중 하나와 각각 면접촉 하도록 플런저접촉경사면을 구비하고,The pistons are provided with a plunger contact inclined surface so as to be in surface contact with one of the four inclined surfaces of the plunger, respectively. 상기 피스톤들은 서로서로 인접한 면이 면접촉하도록 피스톤접촉경사면을 구비한 것The pistons are provided with a piston contact inclined surface such that the adjacent surfaces are in surface contact with each other. 을 특징으로 하는 차량용 브레이크시스템.Vehicle brake system characterized in that. 제1항에 있어서,The method of claim 1, 상기 각 휠의 제동요소는 드럼식브레이크의 휠실린더인 것The braking element of each wheel is a wheel cylinder of a drum brake 을 특징으로 하는 차량용 브레이크시스템.Vehicle brake system characterized in that. 제1항에 있어서,The method of claim 1, 상기 각 휠의 제동요소는 디스크식브레이크의 캘리퍼실린더인 것The braking element of each wheel is a caliper cylinder of a disc brake 을 특징으로 하는 차량용 브레이크시스템.Vehicle brake system characterized in that.
KR1020030101230A 2003-12-31 2003-12-31 Brake system for a vehicle KR100892527B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990014629U (en) * 1997-10-07 1999-05-06 정몽규 Automotive brake system
KR19990020922U (en) * 1997-11-28 1999-06-25 양재신 Wheel Cylinder Structure of Hydraulic Drum Brake System
JP2001500220A (en) 1997-07-11 2001-01-09 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Radial piston pump for high pressure fuel supply
KR20010021669A (en) * 1998-06-05 2001-03-15 클라우스 포스, 게오르그 뮐러 Hydraulic braking system for automobiles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001500220A (en) 1997-07-11 2001-01-09 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Radial piston pump for high pressure fuel supply
KR19990014629U (en) * 1997-10-07 1999-05-06 정몽규 Automotive brake system
KR19990020922U (en) * 1997-11-28 1999-06-25 양재신 Wheel Cylinder Structure of Hydraulic Drum Brake System
KR20010021669A (en) * 1998-06-05 2001-03-15 클라우스 포스, 게오르그 뮐러 Hydraulic braking system for automobiles

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