KR20040049404A - The Mastercylinder for Electro-Hydraulic Brake - Google Patents

The Mastercylinder for Electro-Hydraulic Brake Download PDF

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Publication number
KR20040049404A
KR20040049404A KR1020020076807A KR20020076807A KR20040049404A KR 20040049404 A KR20040049404 A KR 20040049404A KR 1020020076807 A KR1020020076807 A KR 1020020076807A KR 20020076807 A KR20020076807 A KR 20020076807A KR 20040049404 A KR20040049404 A KR 20040049404A
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KR
South Korea
Prior art keywords
bore
piston
hydraulic chamber
hydraulic
simulator
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KR1020020076807A
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Korean (ko)
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KR100653871B1 (en
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송상호
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주식회사 만도
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Priority to KR1020020076807A priority Critical patent/KR100653871B1/en
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Publication of KR100653871B1 publication Critical patent/KR100653871B1/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
    • B60T13/74—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 electrical assistance or drive
    • B60T13/745—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 electrical assistance or drive acting on a hydraulic system, e.g. a master cylinder
    • 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
    • B60T13/14—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 using accumulators or reservoirs fed by pumps
    • B60T13/142—Systems with master cylinder
    • 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

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Regulating Braking Force (AREA)

Abstract

PURPOSE: A master cylinder for an electro-hydraulic brake system is provided to brake stably and efficiently by increasing brake pressure of the front wheels more than brake pressure of the rear wheels in wrong operation of the system, and to obtain the pedal effort properly by transmitting hydraulic pressure to a pedal simulator in braking with flowing hydraulic pressure actively. CONSTITUTION: An electro-hydraulic brake system comprises a first piston(210) and a second piston(220) spaced from each other inside a cylinder(200) with axially sliding; a first bore(260) containing a first hydraulic chamber compressing fluid between the first piston and the second piston; a second bore(270) containing a second hydraulic chamber for compressing between the second piston and the end of the cylinder; a simulator(400) communicated with the second bore; a passage(280) communicated with the first hydraulic chamber and the wheel cylinder of a front wheel; and a passage(290) communicated with the second hydraulic chamber and the wheel cylinder of a rear wheel. The diameter of the first bore is larger than the diameter of the second bore, and a stepped part(300) is formed gradually in the contact portion of the first bore and the second bore to reduce wear of the seal member and to restrict vortex of oil flow. The seal member is placed in the first bore in normally braking to communicate the first hydraulic chamber with the simulator, and placed in the second bore in wrong operation to shut off the second hydraulic chamber with the simulator.

Description

전자식 유압브레이크장치용 마스터실린더{The Mastercylinder for Electro-Hydraulic Brake}Master cylinder for electric hydraulic brake device {The Mastercylinder for Electro-Hydraulic Brake}

본 발명은 전자식 유압 브레이크(EHB : Electro-Hydraulic Brake)시스템에 관한 것으로, 특히 전자식 유압 브레이크(EHB)에 있어서의 브레이크 페달감 향상을 위한 마스터실린더의 내부구조에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electro-hydraulic brake (EHB) system, and more particularly to an internal structure of a master cylinder for improving a feeling of brake pedal in an electro-hydraulic brake (EHB).

통상적으로 EHB시스템에서는 운전자가 브레이크페달을 밟으면 변위센서로부터 브레이크페달의 변위를 감지하여 차단밸브를 닫아 페달 시뮬레이터의 마스터실린더와 휠과의 유로를 분리시키고, 압력센서로부터의 압력신호에 따라 ECU에서 휠 압력을 계산하여 평상시 모터펌프에서 생성한 액압을 저장한 어큐뮬레이터에서의 압력을 각휠에 있는 흡입구와 토출구의 솔레노이드밸브를 이용하여 각휠의 압력을 독립적인 피드백(feed back)제어를 통하여 조절한다. 이때 EHB시스템의 고장시에는 차단밸브가 NO(Normally Open)상태이므로 운전자에 의해서 발생한 마스터실린더의 액압이 그대로 휠 실린더로 유입하여 시스템고장시 최소한의 제동이 이루어질 수 있는 구조로 되어있다. 이때 EHB 시스템에서 운전자의 제동의지를 감지하고 페달 반력을 내주기 위한 페달 시뮬레이터가 필요하다. 이와 같은 페달 시뮬레이터는 마스터실린더와 개구부를 통하여 연통되어 있으며 시뮬레이터피스톤과 피스톤을 탄성지지하는 탄성부재를 포함하고 있어 제동유압이 시뮬레이터내부로 유입시에 탄성부재의 반발력에 의한 페달감조성이 가능하도록 되어있다. 미국특허 US6192685 는 마스터실린더의 제1보어쪽에서 생성된 유압이 제2보어쪽으로 이동하여 제2피스톤(22)의 피스톤랜드(23)사이의 페달시뮬레이터 개구부를 통하여 페달시뮬레이터(44) 내부로 진입하도록 구성된 페달시뮬레이터를 개시한다. 도 1에서 도시되어 있듯이 프라이머리체임버(58)와 리액션체임버(56)사이의 유압통로를 위하여마스터실린더(32)의 내주면의 둘레를 따라 소정폭의 그루브(72)를 가공하였다. 브레이크시스템이 정상작동시에는 마스터실린더(32)와 브레이크 휠(미도시)과의 유로가 차단되므로 마스터실린더는 밀폐상태가 된다. 따라서 마스터실린더의 제2피스톤(60)은 출입밸브쪽의 압축유체(59)와 제1보어쪽의 압축유체(58) 사이에서 고정되게 되고, 이때 제2피스톤의 시일부재(70)가 상기 그루브(72)상에 위치하게 되어 제1보어(45)쪽에서 생성된 유압의 일부가 상기 시일부재(70)와 그루브(72)사이의 틈을 거쳐 제2피스톤랜드(66,68)사이의 시뮬레이터개구부(74)를 통하여 시뮬레이터내부로 진입한다. 시뮬레이터 내부로 진입한 유압은 시뮬레이터피스톤(50)을 밀어 탄성지지되어 있던 스프링(52)을 압축하게 되고 이렇게 압축된 스프링(52)의 반발력에 의해서 페달감이 조성되도록 하였다.In general, the EHB system detects the displacement of the brake pedal from the displacement sensor when the driver presses the brake pedal, closes the shutoff valve to separate the flow path between the master cylinder of the pedal simulator and the wheel, and the wheel in the ECU according to the pressure signal from the pressure sensor. By calculating the pressure, the pressure in the accumulator, which stores the hydraulic pressure generated by the motor pump, is regulated by independent feedback control using the solenoid valves of the inlet and outlet ports of each wheel. At this time, when the EHB system breaks down, the shut-off valve is in the NO (Normally Open) state, so the hydraulic pressure of the master cylinder generated by the driver flows directly into the wheel cylinder. At this time, a pedal simulator is needed to detect the driver's willingness in the EHB system and to provide pedal reaction. The pedal simulator is in communication with the master cylinder through the opening and includes an elastic member for elastically supporting the simulator piston and the piston, so that the pedal sensitivity due to the repulsive force of the elastic member is possible when the braking hydraulic pressure flows into the simulator. have. US patent US6192685 is configured such that the hydraulic pressure generated at the first bore side of the master cylinder moves toward the second bore and enters into the pedal simulator 44 through the pedal simulator opening between the piston lands 23 of the second piston 22. Start the pedal simulator. As shown in FIG. 1, a groove 72 having a predetermined width is machined along the circumference of the inner circumferential surface of the master cylinder 32 for the hydraulic passage between the primary chamber 58 and the reaction chamber 56. When the brake system operates normally, the flow path between the master cylinder 32 and the brake wheel (not shown) is blocked, so that the master cylinder is closed. Accordingly, the second piston 60 of the master cylinder is fixed between the compressed fluid 59 on the inlet valve side and the compressed fluid 58 on the first bore side, wherein the seal member 70 of the second piston is grooved. Part of the hydraulic pressure generated on the first bore 45 side through the gap between the seal member 70 and the groove 72, and the opening of the simulator between the second piston lands 66 and 68 Enter the simulator through 74. The hydraulic pressure entered into the simulator pushes the simulator piston 50 to compress the spring 52 that is elastically supported, and the pedal feeling is formed by the repulsive force of the compressed spring 52.

하지만 종래의 이러한 EHB에 있어서의 문제점은 상기한 그루브를 형성하는데 있어서 가공정밀도유지 및 가공상 어려움이 따른다는 것이다.However, the problem with the conventional EHB is that it is difficult to maintain the processing precision and processing in forming the groove.

본 발명은 이와 같은 문제점을 해결함과 동시에 또 다른목적으로, 가공이 용이하고, 전륜에 제공되는 브레이크 압력을 후륜에 비하여 더 크게 함으로써 안정적인 제동을 수행하도록하면서, 적절한 페달감을 유지시킬수 있는 마스터실린더의 내부구조를 제공하기 위한것이다.The present invention solves this problem and at the same time for another purpose, it is easy to process, and the brake pressure provided on the front wheel is larger than the rear wheel to perform a stable braking, while maintaining a proper pedal feeling of the master cylinder To provide an internal structure.

도 1 종래의 마스터실린더와 시뮬레이터의 단면도.1 is a cross-sectional view of a conventional master cylinder and a simulator.

도 2 본 발명의 마스터실린더와 시뮬레이터의 단면도.2 is a cross-sectional view of the master cylinder and the simulator of the present invention.

도 3 본 발명의 정상제동시의 유압의 흐름을 중심으로 한 마스터실린더와 시뮬레이터의 단면도.Figure 3 is a cross-sectional view of the master cylinder and the simulator centered on the flow of hydraulic pressure during normal braking of the present invention.

도 4 본 발명의 고장제동시의 유압의 흐름을 중심으로 한 마스터실린더와 시뮬레이터의 단면도.4 is a cross-sectional view of the master cylinder and the simulator centering on the flow of hydraulic pressure during breakdown braking of the present invention.

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

200 : 마스터실린더 210 : 제1피스톤 220 : 제2피스톤200: master cylinder 210: first piston 220: second piston

230 : 제1액압실 240 : 제2액압실 260 : 제1보어230: first hydraulic chamber 240: second hydraulic chamber 260: first bore

270 : 제2보어 300 : 단차 310 : 제2피스톤시일부재270: second bore 300: step 310: second piston seal member

330,340 : 차단밸브 400 : 시뮬레이터 410 : 오일공330,340: Shut-off valve 400: Simulator 410: Oil ball

420 : 시뮬레이터피스톤 430 : 압축부재420: simulator piston 430: compression member

상기와 같은 목적을 달성하기 위하여 본 발명은 실린더의 내부에 축방향 슬라이딩이 가능하며 서로 이격되어 있는 제1피스톤과 제2피스톤, 상기 제1피스톤과상기 제2피스톤의 사이에 압축공간인 제1액압실을 포함하는 제1보어, 상기 제2피스톤과 실린더종단부와의 사이에 압축공간인 제2액압실을 포함하는 제2보어, 상기 제2보어와 연통된 시뮬레이터, 상기 제1액압실과 전륜의 휠실린더가 연통된 유로, 상기 제2액압실과 후륜의 휠실린더가 연통된 유로를 구비하고, 정상작동시 상기 유로들은 폐쇄되며 고장시에만 개방되는 전자식 유압브레이크에 있어서,In order to achieve the above object, the present invention provides a compression space between a first piston and a second piston and a first piston and the second piston, which are axially slidable in the cylinder and spaced apart from each other. A first bore including a hydraulic chamber, a second bore including a second hydraulic chamber which is a compression space between the second piston and the cylinder end, a simulator in communication with the second bore, the first hydraulic chamber and the front wheel In the electric hydraulic brake which has a flow path in which the wheel cylinder of the communication cylinder, the flow path in which the second hydraulic chamber and the wheel cylinder of the rear wheel is in communication, the flow path is closed in normal operation and opened only in case of failure,

상기 제1보어의 내경을 상기 제2보어의 내경보다 소정크기 크게 한 것을 특징으로 하는 마스터 실린더를 제공한다. 이하에서는 본 발명에 따른 바람직한 실시 예를 첨부된 도면을 참조하여 상세히 설명한다. 도 2는 본 발명의 마스터실린더의 단면도이다. 도 2에 도시되어 있듯이 본 발명은 아래와 같은 구성을 가진다.The master cylinder is characterized in that the inner diameter of the first bore is larger than the inner diameter of the second bore. Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. 2 is a cross-sectional view of the master cylinder of the present invention. As shown in FIG. 2, the present invention has the following configuration.

실린더(200)의 내부에 축방향 슬라이딩이 가능하며 서로 이격되어 있는 제1피스톤(210)과 제2피스톤(220), 상기 제1피스톤(210)과 상기 제2피스톤(220)의 사이에 유체압축공간인 제1액압실(230)을 포함하는 제1보어(260), 상기 제2피스톤(220)과 실린더종단부와의 사이에 압축공간인 제2액압실(240)을 포함하는 제2보어(270), 상기 제2보어(270)와 연통된 시뮬레이터(400), 상기 제1액압실(230)과 전륜의 휠실린더(530)가 연통된 유로(280), 상기 제2액압실(240)과 후륜의 휠실린더(540)가 연통된 유로(290)를 구비한다. 또한 본 발명의 특징으로써, 제1보어(270)의 내경을 제2보어(260)의 내경보다 소정크기 크게 하여 상기 제1보어(270)와 제2보어(260)가 접하는 부위에 단차(300)가 형성되게 하되 상기 단차(300)의 경사를 완만하게 구비함으로써 시일부재(310)의 마모를 줄이고 또한 오일의 흐름에 난류가 형성되지 않도록 한다. 또한 상기 단차(300)는 정상제동시 제2피스톤(220) 선단의 시일부재(310)가 상기 단차(300)와 간극을 유지하고, 고장제동시 제2피스톤(220) 선단의 시일부재(310)가 상기 단차(300)를 폐쇄하는 위치에 마련하여 유체가 상기 간극으로 출입할 수 있도록 한다. 그리고 상기 제1보어(260)는 전륜의 휠실린더(530)와 유로(280)가 개설되어 있고 상기 제2보어(270)는 후륜의 휠실린더(540)와 유로(290)가 개설되어 있다.A fluid between the first piston 210 and the second piston 220, the first piston 210 and the second piston 220 which are axially slidable and spaced apart from each other in the cylinder 200. A first bore 260 including a first hydraulic pressure chamber 230 which is a compression space, and a second hydraulic pressure chamber 240 which is a compression space between the second piston 220 and the end of the cylinder. Bore 270, the simulator 400 in communication with the second bore 270, the flow path 280, the first hydraulic chamber 230 and the wheel cylinder 530 of the front wheel in communication, the second hydraulic chamber ( 240 and the wheel cylinder 540 of the rear wheel is provided with a flow path (290). In addition, as a feature of the present invention, the inner diameter of the first bore 270 is larger than the inner diameter of the second bore 260 by a predetermined size, and the step 300 is formed in contact with the first bore 270 and the second bore 260. ) Is formed, but by gently providing the inclination of the step 300 to reduce the wear of the seal member 310 and to prevent the turbulence is formed in the flow of oil. In addition, the step 300 is the sealing member 310 of the tip of the second piston 220 when the normal braking maintains a gap with the step 300, the sealing member 310 of the tip of the second piston 220 during the braking failure ) Is provided at a position to close the step 300 to allow fluid to enter and exit the gap. The first bore 260 is provided with a wheel cylinder 530 and a flow path 280 of the front wheel, and the wheel cylinder 540 and a flow path 290 of the rear wheel are formed in the second bore 270.

도 3은 정상제동시의 본 발명의 마스터실린더의 단면도를 유압의 흐름을 중심으로 도시하였다. 도 3에서 보듯이 EHB의 정상작동시에 마스터실린더(200)는 외부와 유압의 흐름이 차단되므로 제2피스톤(220)은 제1액압실(230)과 제2액압실(240)의 유압의 사이에 고정되고, 이때 유압이 제2피스톤(220)과 단차(300)사이 틈을 통하여 시뮬레이터로 이동해 들어가야 하기 때문에 상기 시일부재(310)가 단차(300)상에 간극을 유지하도록 위치하여 상기 시일부재(310)가 유압의 흐름을 막지 않게끔, 상기 단차(300)와 상기 제2피스톤(220)의 고정시의 위치를 결정한다. 보다 더 상세히 설명하면, 운전자가 브레이크페달(미도시)을 밟게 되면 페달의 스트록에 의해 생성된 페달압력이 배력장치(미도시)를 통하면서 적절한 압력으로 변하고 이 압력에 의해 마스터실린더(200)의 제1피스톤(210)이 전진한다. 동시에 변위센서(미도시)로부터 브레이크페달(미도시)이 눌리는 것을 감지하여 차단밸브(330,340)를 닫아 마스터실린더(200)와 휠(530,540)과의 유로를 분리시키고, 압력센서로부터의 압력신호에 따라 ECU(미도시)에서 휠 압력을 계산하여 평상시 모터펌프(미도시)에서 생성한 액압을 저장한 어큐뮬레이터(미도시)에서의 압력을 각휠에 있는 흡입구와 토출구의 솔레노이드밸브를 이용하여 각휠의 압력을 독립적인피드백(feed back)제어를 통하여 조절한다. 한편 마스터실린더(200)의 내부에서는 상기 제1피스톤(210)에 의해 형성된 유압이 제2피스톤(220)을 동방향으로 연동 전진하게 만들고 제2액압실(240)의 유압이 외부와 차단된 상태이기 때문에 상기 제2피스톤은 제1액압실(230)의 압축액과 제2액압실(240)의 압축액사이에서 움직이지 않게 된다. 이때에도 제1피스톤(210)에 의한 유압은 지속적으로 피스톤운동방향으로 이동하게 되므로 정지한 상기 제2피스톤의 시일부재(310)와 상기 단차(300) 사이의 간극을 거쳐 결국은 상기 페달시뮬레이터(400)의 오일공(410)을 통하여 페달시뮬레이터(400) 내부로 진입하게 된다. 이렇게 진입된 유압은 상기페달시뮬레이터의 시뮬레이터피스톤(420)을 밀어내고 상기 시뮬레이터피스톤(420)을 탄성지지하는 완충부재(430)의 반발력에 의해서 운전자는 적절한 페달감을 느낄수 있게 된다.3 is a cross-sectional view of the master cylinder of the present invention during normal braking based on the flow of hydraulic pressure. As shown in FIG. 3, in the normal operation of the EHB, the master cylinder 200 blocks the flow of the hydraulic pressure from the outside, so that the second piston 220 is connected to the hydraulic pressure of the first hydraulic chamber 230 and the second hydraulic chamber 240. The seal member 310 is positioned to maintain a gap on the step 300 because the hydraulic pressure must move into the simulator through the gap between the second piston 220 and the step 300. In order not to block the flow of hydraulic pressure, the member 310 determines the position at the time of fixing the step 300 and the second piston 220. In more detail, when the driver presses the brake pedal (not shown), the pedal pressure generated by the stroke of the pedal is changed to an appropriate pressure through the hydraulic device (not shown), and this pressure causes the master cylinder 200 to be moved. The first piston 210 advances. At the same time, the brake pedal (not shown) is detected from the displacement sensor (not shown) to close the shutoff valves (330, 340) to separate the flow path between the master cylinder (200) and the wheels (530, 540), and to the pressure signal from the pressure sensor. According to the ECU (not shown), the pressure of each wheel is calculated using the solenoid valves of the inlet and outlet ports of each wheel and the pressure of the accumulator (not shown) that stores the hydraulic pressure generated by the motor pump (not shown). Is controlled through independent feedback control. On the other hand, in the interior of the master cylinder 200, the hydraulic pressure formed by the first piston 210 causes the second piston 220 to move forward in the same direction, and the hydraulic pressure of the second hydraulic chamber 240 is blocked from the outside. Therefore, the second piston is not moved between the compressed liquid of the first hydraulic chamber 230 and the compressed liquid of the second hydraulic chamber 240. At this time, since the hydraulic pressure by the first piston 210 continuously moves in the piston movement direction, the pedal simulator eventually passes through the gap between the stationary seal member 310 and the step 300. Through the oil ball 410 of 400 is entered into the pedal simulator (400). In this way, the hydraulic pressure pushes the simulator piston 420 of the pedal simulator and the driver can feel an appropriate pedal by the repulsive force of the shock absorbing member 430 that elastically supports the simulator piston 420.

이와는 별도로 도 4에서 도시되어 있듯이 고장시에는 상기 차단밸브(330,340)가 항상 개방상태에 있기 때문에 마스터실린더(200)가 외부와 개방상태에 놓여있게 된다. 또한 상기 제1보어(260)는 전륜의 휠실린더(530)와 유로(280)가 개설되어 있고 상기 제2보어(270)는 후륜의 휠실린더(540)와 유로(290)가 개설되어 있으므로, 이때에는 상대적으로 큰 내경을 지닌 제1보어(260)에서 생성된 유압이 제1보어(260)측과 개설되어 있는 유로(280)를 따라 전륜의 휠실린더(530)로 이동하여 전륜을 제동하고, 제2피스톤(220)은 유압의 영향을 받아 제2액압실(240)의 말단까지 밀리게 되어 상기 제2피스톤(220)의 시일부재(310)와 단차(300)사이의 간극이 폐쇄된다. 동시에 상대적으로 작은 내경을 지닌 제2보어(270)측 제2액압실(240)의 유압은 후륜의 휠실린더(540)로 이동하여 후륜을 제동하게 된다. 이로써 EHB 시스템의 고장시에는 후륜보다 전륜의 제동압이 더 크게 되므로 안정적인 차량제동을 수행할 수 있게 된다.Apart from this, as illustrated in FIG. 4, in case of a failure, the master cylinder 200 is in an external and open state because the shutoff valves 330 and 340 are always in an open state. In addition, since the first bore 260 has a wheel cylinder 530 and a flow path 280 of the front wheel and the second bore 270 has a wheel cylinder 540 and a flow path 290 of the rear wheel, At this time, the hydraulic pressure generated in the first bore 260 having a relatively large inner diameter moves to the wheel cylinder 530 of the front wheel along the flow path 280 opened with the first bore 260 to brake the front wheel. The second piston 220 is pushed to the end of the second hydraulic chamber 240 under the influence of hydraulic pressure, thereby closing the gap between the sealing member 310 and the step 300 of the second piston 220. . At the same time, the hydraulic pressure of the second hydraulic chamber 240 on the second bore 270 side having a relatively small inner diameter moves to the wheel cylinder 540 of the rear wheel to brake the rear wheel. As a result, when the EHB system breaks down, the braking pressure of the front wheel is greater than that of the rear wheel, thereby enabling stable vehicle braking.

이상에서 상세히 설명한 바와 같이, 본 발명의 구성에 따르면 효과적인 제동을 수행하는데 있어서 적절한 페달감을 조성할수 있는 시뮬레이터를 구비하면서 동시에 가공을 용이하게 하는 구조의 마스터실린더를 제공하고 시스템고장시에는 전륜의 브레이크압력을 후륜보다 더 크게 제공함으로써 보다 안정적인 제동이 가능하도록 하는 효과를 제공해준다.As described in detail above, according to the configuration of the present invention provides a master cylinder of the structure that facilitates processing while providing a simulator that can create a proper pedal feeling in performing effective braking, and the brake pressure of the front wheels in case of system failure By providing a larger than the rear wheels to provide a more stable braking effect.

Claims (2)

실린더의 내부에 축방향 슬라이딩이 가능하며 서로 이격되어 있는 제1피스톤과 제2피스톤, 상기 제1피스톤과 상기 제2피스톤의 사이에 압축공간인 제1액압실을포함하는 제1보어, 상기 제2피스톤과 실린더종단부와의 사이에 압축공간인 제2액압실을 포함하는 제2보어, 상기 제2보어와 연통된 시뮬레이터, 상기 제1액압실과 전륜의 휠실린더가 연통된 유로, 상기 제2액압실과 후륜의 휠실린더가 연통된 유로, 상기 제1피스톤과 상기 제2피스톤은 각각 시일부재를 구비하고, 정상작동시 상기 유로들은 폐쇄되며 고장시에만 개방되는 전자식 유압브레이크에 있어서,A first bore including a first hydraulic chamber capable of axially sliding inside the cylinder and spaced apart from each other, and a first hydraulic chamber, which is a compression space between the first piston and the second piston. A second bore including a second hydraulic chamber which is a compression space between the piston and the cylinder end, a simulator in communication with the second bore, a flow passage in which the wheel cylinder of the first hydraulic chamber and the front wheel communicate with each other, and the second bore. In an electric hydraulic brake in which the hydraulic cylinder and the wheel cylinder of the rear wheel communicate with each other, the first piston and the second piston each have a seal member, and in the normal operation, the passages are closed and are opened only in case of failure. 상기 제1보어의 지름이 상기 제2보어의 지름보다 크게하여 상기 제1보어와 상기 제2보어가 접하는곳에 단차가 형성되고 상기 제2피스톤의 시일부재는 정상제동시 상기 제1보어에 위치하여 상기 제1액압실과 상기 시뮬레이터를 연통시키고, 고장시 제2보어에 위치하여 상기 제2액압실과 상기 시뮬레이터를 차단시키는것을 특징으로 하는 전자식 유압브레이크의 마스터실린더.The diameter of the first bore is larger than the diameter of the second bore so that a step is formed at the contact point between the first bore and the second bore, and the sealing member of the second piston is positioned at the first bore during normal braking. And the first hydraulic chamber and the simulator communicate with each other and, in the event of a failure, the first hydraulic chamber is located in the second bore to shut off the second hydraulic chamber and the simulator. 제 1항에 있어서, 상기 단차의 경사는 완만하게 형성된 것을 특징으로 하는 전자식 유압브레이크의 마스터실린더.The master cylinder of the electromagnetic hydraulic brake according to claim 1, wherein the stepped slope is formed smoothly.
KR1020020076807A 2002-12-05 2002-12-05 The Mastercylinder for Electro-Hydraulic Brake KR100653871B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100987146B1 (en) * 2004-11-19 2010-10-11 주식회사 만도 Master cylinder for electro hydraulic brake
CN114704569A (en) * 2022-04-18 2022-07-05 浙江奔腾智能制动系统有限公司 Novel reducing plunger type brake master cylinder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100987146B1 (en) * 2004-11-19 2010-10-11 주식회사 만도 Master cylinder for electro hydraulic brake
CN114704569A (en) * 2022-04-18 2022-07-05 浙江奔腾智能制动系统有限公司 Novel reducing plunger type brake master cylinder

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