KR0118011B1 - Dual type load sensing proportional valve for a brake system - Google Patents

Dual type load sensing proportional valve for a brake system

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Publication number
KR0118011B1
KR0118011B1 KR1019950018443A KR19950018443A KR0118011B1 KR 0118011 B1 KR0118011 B1 KR 0118011B1 KR 1019950018443 A KR1019950018443 A KR 1019950018443A KR 19950018443 A KR19950018443 A KR 19950018443A KR 0118011 B1 KR0118011 B1 KR 0118011B1
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KR
South Korea
Prior art keywords
valve
chamber
load sensing
type load
dual
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Application number
KR1019950018443A
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Korean (ko)
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KR970000990A (en
Inventor
김수병
Original Assignee
김태구
대우자동차주식회사
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Application filed by 김태구, 대우자동차주식회사 filed Critical 김태구
Priority to KR1019950018443A priority Critical patent/KR0118011B1/en
Publication of KR970000990A publication Critical patent/KR970000990A/en
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Publication of KR0118011B1 publication Critical patent/KR0118011B1/en

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Classifications

    • 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
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/26—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force characterised by producing differential braking between front and rear wheels
    • B60T8/30—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force characterised by producing differential braking between front and rear wheels responsive to load
    • B60T8/306—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force characterised by producing differential braking between front and rear wheels responsive to load using hydraulic 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
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/18—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to vehicle weight or load, e.g. load distribution
    • B60T8/1837—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to vehicle weight or load, e.g. load distribution characterised by the load-detecting 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
    • B60T2210/00—Detection or estimation of road or environment conditions; Detection or estimation of road shapes
    • B60T2210/10—Detection or estimation of road conditions
    • B60T2210/12—Friction

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Hydraulic Control Valves For Brake Systems (AREA)

Abstract

A dual type load sensing proportioning valve of car brake system having the first connecting holes(70,80), the second connecting hole(72) and a sliding piston(90) is disclosed. The first connecting holes(70,80) are formed in a valve body(10) to connect cylinders(21,31) and the second outlets(27,37) from the front of pistons(22,32). The second connecting hole(72) is transversely formed in the middle of first connecting holes(70,80) to open first connecting holes(70,80). The sliding piston(90) is mounted within second connecting hole(72) and forms the first chamber(74) and the second chamber(84) on both sides of itself. Thereby, it is possible to enhance the brake performance because the eccentric braking of rear wheels is prevented, and to prevent the instability of driving.

Description

자동차 제동장치의 듀얼타입 로드센싱프로포셔닝밸브Dual Type Load Sensing Proportioning Valve for Automotive Braking System

제1도는 일반적인 자동차 브레이크장치의 계통도.1 is a system diagram of a general automobile brake system.

제2도는 종래의 듀얼타입 로드센싱 프로포셔닝 밸브를 도시한 단면도.2 is a cross-sectional view of a conventional dual type load sensing proportioning valve.

제3도는 본 발명의 듀얼타입 로드센싱 프로포셔닝 밸브를 도시한 단면도.3 is a cross-sectional view of a dual type load sensing proportioning valve of the present invention.

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

10 : 밸브바디 20 : 제1밸브10: valve body 20: first valve

21,31 : 실린더 22,32 : 피스톤21,31: cylinder 22,32: piston

27,37 : 제2출구 30 : 제2밸브27,37: 2nd outlet 30: 2nd valve

40 : 레버 50 : 조정스프링40: lever 50: adjustment spring

60 : 압축스프링 70,80 : 제1연통공60: compression spring 70, 80: first communication hole

72,82 : 제2연통공 74 : 제1쳄버72,82: 2nd communication hole 74: 1st chamber

84 : 제2쳄버 90 : 슬라이딩 피스톤84: second chamber 90: sliding piston

92 : 오일시일 100 : 플러그92: oil seal 100: plug

본 발명은 자동차 제동장치의 로드센싱프로포셔닝 밸브(Load Sensing Proportioning Valve)에 관한 것으로서, 더욱 상세하게는 자동차의 제동시 노면의 마찰과 적재중량에 따라 후륜의 조김잠김을 방지하여 조종불안정을 해소하고 전륜과 후륜에 이상적인 유압의 분배를 하도록 설치되는 듀얼타입 로드센싱프로포셔닝 밸브에 있어서, 좌/우측 후륜의 휘일실린더와 이에 각각 연결된 두 개의 로드센싱프로포셔닝밸브 사이의 유압경로를 연통하고, 이 연통한 연통공을 따라 압력차에 의해서 슬라이딩하는 슬라이딩피스톤을 설치하여 좌우측 후륜의 휘일실린더에 동일한 유압을 공급함으로써 편제동을 방지하고 제동안정성을 기한 자동차 제동장치의 듀얼타입 로드센싱프로포셔닝밸브에 관한 것이다.The present invention relates to a load sensing provisioning valve of a vehicle braking device, and more particularly, to eliminate steering instability by preventing the locking of the rear wheel according to the friction of the road surface and the loading weight during braking of the vehicle. In the dual type rod sensing proportioning valve installed to distribute the hydraulic pressure ideally to the front and rear wheels, the hydraulic path between the wheel cylinder of the left and right rear wheels and the two rod sensing proportioning valves connected to each other is connected. The dual type rod sensing proportioning of the automobile braking system prevents uneven braking by providing the same hydraulic pressure to the wheel cylinders of the left and right rear wheels by installing a sliding piston sliding by pressure difference along the communicating communication hole. It is about a valve.

일반적으로 자동차는 제동시에 차량중심이 전방으로 이동하여 전륜의 하중은 증가하고 후륜의 하중은 감소하는 현상이 발생한다. 이때 휘일을 제동하는 제동력이 노면과의 마찰력 이상으로 되면 휘일은 록크되고 스키드(Skid)를 일으키게 된다. 이때에는 노면과의 마찰력이 감소된 상태에서 미끄러지는 것이므로 제동성능이 저하될 뿐만 아니라 방향성을 잃게 되어 조종불안정을 초래하게 된다. 이와 같은 록크는 상대적으로 하중이 감소된 후륜에서 먼저 시작하게 된다.In general, when the vehicle is braked, the center of the vehicle moves forward so that the load on the front wheel increases and the load on the rear wheel decreases. At this time, when the braking force for braking the wheel becomes more than a frictional force with the road surface, the wheel is locked and generates skids. In this case, since the sliding friction with the road surface is reduced, the braking performance is not only deteriorated but also the direction is lost, resulting in unstable steering. These locks start first in the rear wheels with relatively reduced load.

이에 따라, 종래에는 제동력의 변화나 감속도 및 적재하중에 따라 후륜의 제동력을 자동적으로 감압시키고 유압개시점을 조정하여 전륜과 후륜에 이상적인 유압의 분배를 하도록 하는 로드센싱프로포셔닝밸브를 마스터실린더와 휘일실린더 사이에 장치하여 사용하였다.Accordingly, in the related art, the master cylinder is a rod-sensing proportioning valve that automatically reduces the braking force of the rear wheel according to the change of the braking force, the deceleration, and the loading load, and adjusts the hydraulic starting point to distribute the ideal hydraulic pressure to the front and rear wheels. The device was used between the wheel cylinder and the wheel cylinder.

제1도에는 상기와 같은 로드센싱프로포셔닝밸브가 설치된 자동차 제동장치의 브레이크 라인(Brake Line)을 개략적으로 도시하였다.FIG. 1 schematically illustrates a brake line of a vehicle braking apparatus provided with the above-described load sensing proportioning valve.

도시된 로드센싱프로포셔닝밸브(2)는 동일한 두 개의 밸브를 하나의 밸브바디(2a)내에 수용하여 일측의 밸브가 전후방 대각의 휘일을 담당하도록 하는 듀얼타입 로드센싱프로포셔닝밸브(Dual Type Load Sensing Propotioning Valve)이다.The illustrated load sensing proportioning valve (2) is a dual type load sensing proportioning valve (Dual Type) that accommodates two identical valves in one valve body (2a) so that one valve is responsible for diagonally forward and backward wheels. Load Sensing Propotioning Valve).

브레이크페달(도시되지 않음)을 밟아 그 답력이 마스터실린더(4)에 작용하면 마스터실린더(4)의 유압은 각각의 밸브를 통하여 각각의 휘일에 전달된다. 일측의 밸브는 전방우측 브레이크(6a)와 후방좌측 브레이크(7b)에, 타측의 밸브는 전방좌측 브레이크(6b)와 후방우측 브레이크(7a)에 유압을 전달하도록 되어 있다.When the pedal pedal (not shown) is pressed and the pedal force acts on the master cylinder 4, the hydraulic pressure of the master cylinder 4 is transmitted to each wheel through each valve. One valve transmits hydraulic pressure to the front right brake 6a and the rear left brake 7b, and the other valve transmits the hydraulic pressure to the front left brake 6b and the rear right brake 7a.

제2도에는 상기 종래의 듀얼타입 로드센싱프로포셔닝밸브의 단면을 도시하였다. 제1도와는 상이한 부호를 부여하여 설명한다.2 is a cross-sectional view of the conventional dual-type load sensing proportioning valve. It demonstrates by attaching the code different from FIG.

도시된 듀얼타입 로드센싱프로포셔닝밸브는 대분하여 바디(10), 레버(40), 조정스프링(50), 압축스프링(60)으로 이루어진다. 상기 바디(10)는 자동차의 프레임에 고정되고, 상기 조정스프링(50)은 자동차 리어 서스펜션(Rear Suspension)에 고정된다.The dual type load sensing proportioning valve shown is composed of a body 10, a lever 40, an adjustment spring 50, a compression spring 60. The body 10 is fixed to the frame of the vehicle, the adjustment spring 50 is fixed to the vehicle rear suspension (Rear Suspension).

상기 바디(10)에는 제1밸브(20)와 제2밸브(30)가 대칭으로 형성되어 있는데, 양측 공히 실린더(21,31)내에서 왕복이동하는 피스톤(22,32)와, 밸브시트(23,33) 및 개폐밸브(24,34)가 내재된다. 상기 실린더(21,31)측방으로는 각각 마스터실린더(도시되지 않음)에서 유압이 전달되는 유입구(25,35)와, 상기 유입구(25,35)와 연통되어 자동차 전륜 휘일실린더에 송압하는 제1출구(26,36)가 형성된다. 또한, 상기 실린더(21,31)전방으로는 후륜 휘일실린더로 송압하는 제2출구(27,37)가 형성된다.The first valve 20 and the second valve 30 are formed symmetrically in the body 10, and both the pistons 22 and 32 reciprocating in the cylinders 21 and 31 and the valve seats (both sides). 23 and 33 and on-off valves 24 and 34 are inherent. The cylinders 21 and 31 are respectively connected to the inlets 25 and 35 through which hydraulic pressure is transmitted from a master cylinder (not shown), and the first ports communicating with the inlets 25 and 35 to feed the vehicle front wheel cylinder. Outlets 26 and 36 are formed. Further, second outlets 27 and 37 for feeding pressure to the rear wheel cylinder are formed in front of the cylinders 21 and 31.

한편, 상기 레버(40)는 일단이 리어 서스펜션에 고정된 조정스프링(50)의 타단에 연결되어 푸시로드(42)와 스프링시트(44)를 통하여 상기 제1,2밸브(20,30)의 피스톤(22,32)을 밀게된다. 이때 상기 스프링시트(44)에는 압축스프링(60)이 설치되어 상기 피스톤(22,32)을 미는 레버(40)에 대항하는 힘을 작용한다.On the other hand, the lever 40 is one end is connected to the other end of the adjustment spring 50 is fixed to the rear suspension of the first and second valves 20 and 30 through the push rod 42 and the spring seat 44 The pistons 22 and 32 are pushed. At this time, the spring seat 44 is provided with a compression spring 60 acts a force against the lever 40 for pushing the piston (22,32).

브레이크페달의 답력으로 마스터실린더의 유압은 로드센싱로포셔닝밸브의 제1밸브(20)와 제2밸브(30)에 형성된 유입구(25,35)를 통하여 실린더(21,31)로 전달된다. 실린더(21,31)에 작용한 유압력은 제1출구(26,36)로는 직접 전달되어 전륜 휘일실린더(도시되지 않음)로 송압되고, 제2출구(27,37)로는 상기 피스톤(22,32)내측과, 상기 밸브시트(23,33)와 개폐밸브(24,34)사이의 공간을 경유하여 후륜 휘일실린더로 송압된다.The hydraulic pressure of the master cylinder is transmitted to the cylinders 21 and 31 through the inlets 25 and 35 formed in the first valve 20 and the second valve 30 of the rod sensing low-facing valve by the force of the brake pedal. The hydraulic force acting on the cylinders 21 and 31 is directly transmitted to the first outlets 26 and 36 and is fed to the front wheel cylinder (not shown), and the pistons 22 and 2 to the second outlets 27 and 37. 32) It is fed to the rear wheel cylinder via the space between the valve seats 23 and 33 and the on-off valves 24 and 34.

브레이크페달을 더욱 밟아 후륜 휘일실린더의 압력이 상승하면 상기 피스톤(22,32)은 상기 조정스프링(50)의 탄성력을 극복하는 방향으로 이동하게 되어 상기 피스톤(22,32)의 일측에 고정된 밸브시트(23,33)가 상기 개폐밸브(24,34)에 닿아 통로가 폐쇄되는 것이다. 이와 같이 통로가 폐쇄된 이후에도 계속하여 마스터실린더의 유압이 상승하면 피스톤(22,32)은 다시 반대방향으로 이동하여 통로가 개방되어 휘일실린더측의 유압도 상승한다. 상기 휘일실린더측의 유압상승은 피스톤(22,32)을 통로가 폐쇄되는 방향으로 이동시키려는 힘과 평형이 될 때까지 계속되는데, 이때 상기 휘일실린더측의 유압상승분은 마스터실린더측의 유압상승분 보다 작게 된다. 즉, 통로가 폐쇄되는 방향으로의 피스톤(22,32) 유압작용 단면적이 개방하려는 쪽의 유압작용 단면적보다 커서 양측이 힘의 평형을 이룰때는 항상 휘일실린더측의 유압이 작아도 되도록 되어 있었다.When the brake pedal is further stepped and the pressure of the rear wheel cylinder is increased, the pistons 22 and 32 move in a direction that overcomes the elastic force of the adjustment spring 50, and thus the valve fixed to one side of the pistons 22 and 32. Seats 23 and 33 touch the on-off valves 24 and 34 so that passages are closed. In this way, if the hydraulic pressure of the master cylinder continues to rise even after the passage is closed, the pistons 22 and 32 move again in the opposite direction, and the passage is opened to increase the hydraulic pressure of the wheel cylinder side. The hydraulic lift on the wheel cylinder side continues until it is in equilibrium with the force to move the pistons 22 and 32 in the direction in which the passage is closed, wherein the hydraulic lift on the wheel cylinder side is smaller than the hydraulic lift on the master cylinder side. do. That is, the hydraulic cross section of the pistons 22 and 32 in the direction in which the passage is closed is larger than the hydraulic cross section of the side to be opened so that the hydraulic pressure on the wheel cylinder side may always be small when both sides balance the force.

한편, 자동차의 적재중량이 커지면 상기 밸브바디(10)는 프레임에 고정되어 있고 상기 조정스프링(50)의 일단은 리어 서스펜션에 고정되어 있으므로 조정스프링(50)이 인장된다. 따라서 피스톤(22,32)에 작용하는 힘이 커지게 되어 밸브 개폐시점을 변화시킴으로써 이상적인 제동력을 얻을 수 있도록 되어 있다.On the other hand, when the loading weight of the vehicle increases, the valve body 10 is fixed to the frame and one end of the adjustment spring 50 is fixed to the rear suspension, so that the adjustment spring 50 is tensioned. Therefore, the force acting on the pistons 22 and 32 is increased, so that the ideal braking force can be obtained by changing the opening and closing time of the valve.

그러나, 상기와 같은 종래의 듀얼타입 로드센싱프로포셔닝밸브에 있어서는 제1,2밸브로 나뉘어져 제2출구로 각각의 후륜실린더에 별도로 전달됨에 따라서 각각의 후륜이 독립하여 제동되도록 되어 있었다. 그 결과 유압관의 배관상 및 밸브의 제조상의 영향에 따른 제품 고유의 오차와 브레이크의 반응속도차로 인해서 양측에 균등한 유압과 유압개시점을 얻을 수 없어 후륜이 편제동됨으로써, 제동성능이 저하되고 조종불안정이 초래되는 문제점이 있었다.However, in the conventional dual type load sensing proportioning valve as described above, each rear wheel is independently braked by being divided into first and second valves and separately transmitted to each rear wheel cylinder to the second outlet. As a result, due to the inherent error of the product due to the influence of the piping on the hydraulic pipe and the manufacturing of the valve and the difference in the reaction speed of the brake, it is impossible to obtain the equal hydraulic pressure and the hydraulic starting point on both sides. There was a problem that caused control instability.

본 발명은 상기와 같은 문제점을 해소하기 위하여 밸브바디에 양측 제2출구의 압력차에 따라 슬라이딩하는 슬라이딩피스톤을 내재하여 후륜 양측에 동일한 유압력이 작용하도록하여 후륜의 편제동을 방지함으로써, 조종불안정을 일소하고, 차량 제동성능을 향상시키는데 그 목적이 있다.The present invention has a sliding piston sliding to the valve body in accordance with the pressure difference of the second outlet on both sides in order to solve the above problems, so that the same hydraulic force acts on both sides of the rear wheel to prevent the uneven braking of the rear wheel, steering stability The purpose is to clean the vehicle and improve the braking performance of the vehicle.

상술한 목적을 달성하기 위한 본 발명의 듀얼타입 로드센싱프로포셔닝밸브는, 피스톤의 전방으로부터 실린더와 제2출구를 연통하도록 밸브바디에 연장형성된 제1연통공과, 상기 제2연통공의 중간부에 상기 양측의 제1연통공을 횡으로 연통하도록 관통형성된 제2연통공과, 상기 제2연통공내에 슬라이딩 가능하도록 내재되어 양측으로 제1,2쳄버가 형성되도록 하는 슬라이딩피스톤을 포함하는 것을 특징으로하여, 상기 제1,2쳄버간의 압력차에 따라서 상기 슬라이딩피스톤이 슬라이딩하여 양측 쳄버의 압력을 평형을 이룸으로써 후륜의 휘일실린더에 동일 유압과 동일 유압 개시점이 작용하도록 한 것이다.The dual type load sensing proportioning valve of the present invention for achieving the above object includes a first communication hole extending in the valve body so as to communicate the cylinder and the second outlet from the front of the piston, and an intermediate portion of the second communication hole. And a second communication hole formed to penetrate the first communication holes on both sides in a transverse direction, and a sliding piston embedded in the second communication hole to allow the first and second chambers to be formed on both sides. Thus, the sliding piston is slid according to the pressure difference between the first and second chambers to balance the pressures of both chambers so that the same hydraulic pressure and the same hydraulic pressure start point act on the wheel cylinder of the rear wheel.

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 구체적으로 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

제3도는 본 발명의 듀얼타입 로드센싱프로포셔닝밸브의 단면을 도시한 도면이다.3 is a cross-sectional view of the dual type load sensing proportioning valve of the present invention.

제2도에 있어서와 동일한 부분에 대하여는 동일한 부호를 부여하여 설명한다.The same parts as in FIG. 2 will be described with the same reference numerals.

도시된 바와 같이 본 발명은 제1,2밸브(20,30)가 하나의 밸브바디(10)내에 수용되어 일측의 밸브(20,30)가 각각 전후방 대각의 휘일실린더에 유압통로로 연결되며, 자동차 중량에 따라서 피스톤(22,32)에 압력을 작용하는 레버(40), 조정스프링(50), 압축스프링(60)이 구비된 듀얼타입 로드센싱프로포셔닝밸브에 있어서, 피스톤(22,32)의 전방으로부터 실린더(21,31)와 제2출구(27,37)를 연통하도록 상기 밸브바디(10)에 연장형성된 제1연통공(70,80)과, 상기 연장형성된 제1연통공(70,80)의 중간부에 상기 양측의 제1연통공(70,80)을 횡으로 연통하도록 관통형성된 제2연통공(72)과, 상기 제2연통공(72)내에 슬라이딩가능하도록 내재되는 슬라이딩피스톤(90)을 포함한다. 이때, 상기 슬라이딩피스톤(40)의 양측에는 유체가 보이는 일정한 공간부인 제1,2쳄버(74,84)가 형성된다.As shown in the present invention, the first and second valves 20 and 30 are accommodated in one valve body 10 so that the valves 20 and 30 on one side are connected to the front and rear diagonal cylinders by hydraulic passages. In the dual type rod sensing proportioning valve, which is provided with a lever 40, an adjustment spring 50, and a compression spring 60 that exert pressure on the pistons 22 and 32 according to the vehicle weight, the pistons 22 and 32 First communication holes 70 and 80 formed in the valve body 10 so as to communicate the cylinders 21 and 31 and the second outlets 27 and 37 from the front of A second communication hole 72 formed to penetrate the first communication holes 70 and 80 on both sides in a middle portion of the second communication hole 72 and a sliding portion in the second communication hole 72; And a sliding piston 90. At this time, the first and second chambers 74 and 84, which are constant space portions in which fluid is visible, are formed at both sides of the sliding piston 40.

상기 슬라이딩피스톤(90)에는 슬라이딩피스톤(90)이 상기 제2연통공(72,82)내에서 슬라이딩하더라도 상기 제1쳄버(74)와 제2쳄버(84)가 연통되지 못하도록하여 제1,2쳄버(74,84)의 압력이 그대로 슬라이딩피스톤(90)에 작용되도록 다수의 오일시일(92)이 설치된다.The sliding piston 90 does not allow the first chamber 74 and the second chamber 84 to communicate with each other even when the sliding piston 90 slides in the second communication holes 72 and 82. A plurality of oil seals 92 are installed so that the pressures of the chambers 74 and 84 are applied to the sliding piston 90 as they are.

또한, 상기 제1,2쳄버(74,84)의 양측은 상기 밸브바디(10)에 스크류체결되는 플러그(100)로 밀봉된다.In addition, both sides of the first and second chambers 74 and 84 are sealed with a plug 100 screwed to the valve body 10.

본 발명의 듀얼 프로포셔닝밸브는 상기와 같이 구성되어 있기 때문에 제1,2밸브(20,30)가 열려 마스터실린더의 유압이 제1연통공(70,80)을 통하여 후륜의 휘일실린더에 작용할때에 만약, 상기 제1,2밸브(20,30)의 실린더(21,31)에 작용한 유압력이 차이가 있다면, 상기 제1연통공(70,80)과 만나는 제1쳄버(74)와 제2쳄버(84)에는 소정의 차압이 발생한다. 이러한 차압은 상기 제1,2쳄버(74,84)와 연통된 제2연통공(72)내에 있는 슬라이딩 피스톤(90)의 양측에 작용하여 슬라이딩피스톤(90)을 압력이 낮은쪽으로 이동시키게 된다. 슬라이딩 피스톤(90)의 이동은 상기 양 쳄버(74,84)의 압력이 동일해지는 지점에서 평형을 이루게 되어 양측의 후륜 휘일실린더에는 동일한 유압력이 작용하게 되는 것이다.Since the dual proportioning valve of the present invention is configured as described above, the first and second valves 20 and 30 are opened so that the hydraulic pressure of the master cylinder may act on the wheel cylinder of the rear wheel through the first communication holes 70 and 80. At this time, if there is a difference in the hydraulic force applied to the cylinders 21 and 31 of the first and second valves 20 and 30, the first chamber 74 that meets the first communication holes 70 and 80 And a predetermined differential pressure is generated in the second chamber 84. This differential pressure acts on both sides of the sliding piston 90 in the second communication hole 72 in communication with the first and second chambers 74 and 84 to move the sliding piston 90 to a lower pressure side. The movement of the sliding piston 90 is balanced at the point where the pressures of the two chambers 74 and 84 are equal, so that the same hydraulic force acts on both rear wheel cylinders.

휘일실린더의 압력이 더욱 상승하여 소정치 이상이 되면 상기 피스톤(22,32)이 이동하여 제2연통공(72)으로 통하는 유로를 차단한다. 마찬가지로 이때에도 양측의 후륜 휘일실린더에 작용하는 압력에 차이가 발생하면 상기 제1,2쳄버(74,84)사이에는 차압이 발생한다. 따라서, 상기 슬라이딩피스톤(90)이 이동하여 양 쳄버(74,84)의 압력이 평형을 이루게 되는 것이다.When the pressure of the wheel cylinder further rises to a predetermined value or more, the pistons 22 and 32 move to block the flow passage through the second communication hole 72. Similarly, at this time, if there is a difference in pressure applied to the rear wheel cylinders on both sides, a differential pressure is generated between the first and second chambers 74 and 84. Accordingly, the sliding piston 90 is moved to balance the pressures of both chambers 74 and 84.

상술한 바와 같이 본 발명에 따른 자동차 제동장치의 듀얼타입 로드센싱 프로포셔닝밸브에 있어서는 좌/우측 후륜의 휘일실린더에 작용하는 압력이 평형을 이루는 위치로 슬라이딩하는 슬라이딩피스톤을 내재하여 후륜의 편제동이 방지됨으로써 제동성능을 향상시킬 수 있으며, 조종불안정도 방지할 수 있는 효과가 있는 매우 유용한 발명인 것이다.As described above, in the dual-type load sensing proportioning valve of the automobile brake system according to the present invention, the rear wheel is unbalanced by a sliding piston in which the pressure acting on the wheel cylinder of the left and right rear wheels is slid to a balanced position. This prevents the braking performance can be improved, it is a very useful invention that has the effect of preventing the control instability.

Claims (3)

제1,2밸브(20,30)가 하나의 밸브바디(10)내에 수용되어 일측의 밸브가 각각 전후방 대각의 휘일실린더에 유압통로로 연결되며, 자동차 중량에 따라서 피스톤(22,32)에 압력을 작용하는 레버(40), 조정스프링(40), 압축스프링(60)이 구비된 자동차 제동장치의 듀얼타입 로드센싱프로포셔닝밸브에 있어서, 피스톤(22,32)의 전방으로부터 실린더(21,31)와 제2출구(27,37)를 연통하도록 상기 밸브바디(10)에 연장형성된 제1연통공(70,80)과, 상기 연장형성된 제1연통공(70,80)의 중간부에 상기 양측의 제1연통공(70,80)을 횡으로 연통하도록 관통형성된 제2연통공(72)과, 상기 제2연통공(72)내에 슬라이딩 가능하게 내재되어 양측으로 제1쳄버(74)와 제2쳄버(84)가 형성되도록 하는 슬라이딩피스톤(90)을 포함하는 것을 특징으로 하는 자동차 제동장치의 듀얼타입 로드센싱프로포셔닝 밸브.The first and second valves 20 and 30 are accommodated in one valve body 10 so that one valve is connected to the front and rear diagonal cylinders by a hydraulic passage, and the pressure is applied to the pistons 22 and 32 according to the vehicle weight. In the dual-type load sensing proportioning valve of a vehicle braking device provided with a lever 40, an adjustment spring 40, and a compression spring 60 acting on the cylinder, a cylinder 21, 31 and first communication holes 70 and 80 extending in the valve body 10 so as to communicate the second outlets 27 and 37 and an intermediate portion of the extended first communication holes 70 and 80. The second communication hole 72 formed to penetrate the first communication hole (70, 80) of both sides transversely, and the first chamber 74 in both sides is slidably embedded in the second communication hole (72) And dual type rod sensing proportioning of a vehicle braking device, characterized in that it comprises a sliding piston (90) for forming a second chamber (84). Rove. 제1항에 있어서, 상기 슬라이딩피스톤(90)에는 상기 제1쳄버(74)와 제1쳄버(84)가 연통되지 못하도록 하는 다수의 오일시일(92)이 구비된 것을 특징으로 하는 자동차 제동장치의 듀얼타입 로드센싱프로포셔닝 밸브.According to claim 1, wherein the sliding piston (90) of the automobile braking device, characterized in that a plurality of oil seals (92) to prevent the first chamber (74) and the first chamber 84 is in communication with each other Dual type load sensing proportioning valve. 제1항에 있어서, 상기 제1,2쳄버(74,84)의 일측은 상기 밸브바디(10)에 스크류체결되는 플러그(100)로 막혀 일정한 체적을 갖추도록 된 것을 특징으로 하는 자동차 제동장치의 듀얼 프로포셔닝밸브.According to claim 1, wherein one side of the first and second chambers (74, 84) is blocked by the plug 100 is screwed to the valve body 10 of the automobile braking device, characterized in that to have a constant volume Dual proportioning valve.
KR1019950018443A 1995-06-30 1995-06-30 Dual type load sensing proportional valve for a brake system KR0118011B1 (en)

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KR1019950018443A KR0118011B1 (en) 1995-06-30 1995-06-30 Dual type load sensing proportional valve for a brake system

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KR0118011B1 true KR0118011B1 (en) 1997-10-04

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