KR960009980Y1 - Brake mode converting system - Google Patents

Brake mode converting system

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Publication number
KR960009980Y1
KR960009980Y1 KR2019940029951U KR19940029951U KR960009980Y1 KR 960009980 Y1 KR960009980 Y1 KR 960009980Y1 KR 2019940029951 U KR2019940029951 U KR 2019940029951U KR 19940029951 U KR19940029951 U KR 19940029951U KR 960009980 Y1 KR960009980 Y1 KR 960009980Y1
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KR
South Korea
Prior art keywords
brake
valves
mode
valve
accumulator
Prior art date
Application number
KR2019940029951U
Other languages
Korean (ko)
Other versions
KR960017234U (en
Inventor
정영수
Original Assignee
현대중공업 주식회사
김정국
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Application filed by 현대중공업 주식회사, 김정국 filed Critical 현대중공업 주식회사
Priority to KR2019940029951U priority Critical patent/KR960009980Y1/en
Publication of KR960017234U publication Critical patent/KR960017234U/en
Application granted granted Critical
Publication of KR960009980Y1 publication Critical patent/KR960009980Y1/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
    • 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
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
    • B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
    • 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
    • B60T13/141—Systems with distributor valve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/40—Special vehicles
    • B60Y2200/41—Construction vehicles, e.g. graders, excavators
    • 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)
  • Operation Control Of Excavators (AREA)
  • Braking Systems And Boosters (AREA)

Abstract

내용없음.None.

Description

굴삭기의 브레이크 모드 전환시스템Excavator brake mode switching system

제1도는 본 고안 시스템의 유압회로도.1 is a hydraulic circuit diagram of the present invention system.

제2도는 종래 시스템의 유압회로도이다.2 is a hydraulic circuit diagram of a conventional system.

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

1 : 펌프 2 : 릴리프밸브1: Pump 2: Relief Valve

3 : 어큐무레이트축압밸브 4 : 체크밸브3: accumulator accumulator valve 4: check valve

5 : 어큐무레이터 6 : 솔레노이드밸브5: accumulator 6: solenoid valve

7 : 감압밸브 8 : 오리피스7: pressure reducing valve 8: orifice

9 : 체크밸브 10 : 솔레노이드밸브9: check valve 10: solenoid valve

11 브레이크밸브 12 : 모드전환스위치11 Brake Valve 12: Mode Switch

13 : 액슬브레이크실린더 14 : 유압탱크13: axle brake cylinder 14: hydraulic tank

15 : 브레이크페달15: brake pedal

본 고안은 브레이크 모드를 주행중의 브레이크 모드와 작업시의 브레이크 모드 사이에서 용이하게 전환 가능케 하는 굴삭기의 브레이크 모드전환시스템에 관한 것으로서, 주행중의 브레이크 모드에서 작업시의 브레이크 모드로의 전환이 모드전환 스위치의 조작만으로 간단히 행해지는 굴삭기의 브레이크 모드전환 시스템에 관한 것이다.The present invention relates to a brake mode switching system of an excavator which enables the brake mode to be easily switched between a brake mode during driving and a brake mode at work. It relates to a brake mode switching system of an excavator which is simply performed by the operation of.

일반적으로, 바퀴식 굴삭기는 주차, 주행, 작업등 3가지 상태에 따라 적절한 브레이크를 사용하게 되는데, 주행시의 적절한 감속과 작업시 장비의 안정적이고 지속적인 제동을 위해 액슬 브레이크 실린더를 작동시키는 브레이크가 있으며, 주차시는 별도의 주차브레이크를 사용한다.In general, wheeled excavators use the appropriate brake according to three conditions such as parking, driving, and work.There are brakes that operate the axle brake cylinder for proper deceleration during driving and stable and continuous braking of the equipment during work. When parking, use a separate parking brake.

브레이크 시스템의 구성요소로는 엔진에 의해 압유를 공급하는 펌프와, 펌프로부터 공급된 압유를 축압하여 엔진동력이 끊겼을 때도 일정시간 브레이크 압력을 유지하는 에큐무레이터, 운전자에게 의해 조작되는 브레이크 밸브가 있으며, 주행브레이크와 작업브레이크 상태를 구분해주는 솔레노이드 밸브 및 체크밸브가 있다.Components of the brake system include a pump for supplying pressure oil by the engine, an accumulator for maintaining the brake pressure for a certain time even when the engine power is lost by accumulating the pressure oil supplied from the pump, and a brake valve operated by the driver. There is a solenoid valve and a check valve that distinguish between the driving brake and the work brake.

종래의 굴삭기 브레이크 모드 전환시스템은 제2도에 도시된 바와 같이 펌프(1)에 의해 공급된 압유가 어큐무레이터(5)에 공급되어 축압되고, 상기 어큐무레이트(5)로부터의 압유는 브레이크 밸브(11)와 파일롯트 체크밸브(9a,8b)를 통해 액슬브레이크 실린더(11a,11b)로 흐르도록 구성되며, 모드전환스위치(12)에 의해 작동되는 솔레노이드 밸브(6)는 상기 어큐무레이터(5)와 상기 파일롯트체크밸브(9a,9b)사이에 연결되어 있다.In the conventional excavator brake mode switching system, as shown in FIG. 2, the hydraulic oil supplied by the pump 1 is supplied to the accumulator 5 to accumulate pressure, and the hydraulic oil from the accumulator 5 is braked. The solenoid valve 6 configured to flow through the valve 11 and the pilot check valves 9a and 8b to the axle brake cylinders 11a and 11b and operated by the mode changeover switch 12 is the accumulator. (5) and the pilot check valves 9a and 9b.

이상과 같은 종래의 브레이크 모드전환 시스템은 브레이크 페달(15)에 의해 브레이크 밸브(11a,11b)가 작동되면 모드스위치(12)의 연결상태와 관계없이 항상 어큐무레이트(5)로부터의 압유가 브레이크 밸브(11a,11b)와 파일롯트체크밸브(9a,9b)를 통해 실린더에 공급되지만, 이 상태에서 브레이크 페달(15)에서 발을 떼게 되면 상기 모드전환스위치(12)의 연결상태에 따라 작동이 상이하게 이루어진다.In the conventional brake mode switching system as described above, when the brake valves 11a and 11b are operated by the brake pedal 15, the hydraulic oil from the accumulator 5 always brakes regardless of the connection state of the mode switch 12. Although supplied to the cylinder through the valves 11a and 11b and the pilot check valves 9a and 9b, when the foot pedal is released from the brake pedal 15 in this state, the operation is performed according to the connection state of the mode changeover switch 12. It is made differently.

즉, 모드전환스위치(12)가 주행모드에 연결된 상태에서 브레이크 페달(15)로부터 발을 떼면, 솔레노이드밸브(6)가 작동되어 어큐무레이터(5)로부터 파일롯트체크밸브(9a,9b)로의 유로가 개방되고, 액슬브레이크실린더(13)내에 있던 압유는 상기 파일롯트체크밸브(9a,9b)와 브레이크 밸브(11a,11b)를 통해 유압탱크(14)로 드레인되어 제동상태가 해제된다.That is, when the mode switching switch 12 is disconnected from the brake pedal 15 while the mode switching switch 12 is connected to the travel mode, the solenoid valve 6 is operated to drive the pilot check valves 9a and 9b from the accumulator 5. The flow path is opened, and the hydraulic oil in the axle brake cylinder 13 is drained to the hydraulic tank 14 through the pilot check valves 9a and 9b and the brake valves 11a and 11b to release the braking state.

반면에 모드전환스위치(12)가 작업모드에 연결된 상태에서 브레이크 페달(15)로부터 발을 떼면, 솔레노이드밸브(6)가 작동되지 않으므로 어큐무레이트(5)로부터 파일롯트체크밸브(9a,9b)로의 유로가 폐쇄되고, 액슬브레이크실린더(13)내에 있던 압유는 상기 파일롯트체크밸브(9a,9b)에 의해 유압탱크(14)로의 드레인이 차단되므로, 발을 떼더라도 제동상태가 계속 유지되는 것이다.On the other hand, if the foot switch is released from the brake pedal 15 while the mode changeover switch 12 is connected to the working mode, the solenoid valve 6 does not operate, so the pilot check valve 9a, 9b from the accumulator 5 is turned off. The flow path of the furnace is closed and the hydraulic oil in the axle brake cylinder 13 is blocked by the pilot check valves 9a and 9b to the hydraulic tank 14 so that the braking state is maintained even when the foot is released. .

그런데, 실제적인 중장비작업에서는 모드전환스위치(12)를 주행모드에 연결한 상태에서 중장비를 작업위치로 이동시킨 후에, 작업모드로 전환시켜 작업을 하게 되는데, 이때 주행모드상태로 브레이크페달(15)을 밟은 상태에서 작업모드로 전환될 경우에는 액션브레이크 실린더(13)내에 압유가 충분히 공급된 상태에서 제동상태가 유지되므로 작업브레이크 기능이 이루어지지만, 대개의 경우 주행모드 상태에서 브레이크 페달(15)로부터 발을 뗀 상태에서 작업모드로 전환하는 것이 운전자의 관습이므로, 액슬브레이크실린더(13)내의 압유가 유압탱크(14)로 이미 드레인된 상태에서 작업모드로 전환되어, 재차 브레이크 페달(15)을 몇번 밟아 상기 브레이크 실린더(13)로 이미 드레인된 상태에서 작업모드로 전환되어, 재차 브레이크 페달(15)을 몇번 밟아 상기 브레이크 실린더(13)내에 압유를 공급하지 않으면 작업브레이크 기능이 이루어지지 않는 것이다.By the way, in the actual heavy equipment work, after moving the heavy equipment to the working position in the state connected to the mode switching switch 12 in the driving mode, the work mode is switched to work, the brake pedal 15 in the driving mode state at this time In the case of switching to the work mode from the stepped state, the braking state is maintained in the state in which the hydraulic brake is sufficiently supplied in the action brake cylinder 13, but the work brake function is achieved. Since it is the custom of the driver to switch to the work mode with the foot released, the oil pressure in the axle brake cylinder 13 has already been drained to the hydraulic tank 14 to switch to the work mode, and the brake pedal 15 is again rotated several times. It is switched to the operation mode in a state where it is already drained to the brake cylinder 13 by stepping on the brake pedal 15 several times again. If the hydraulic oil is not supplied to the brake cylinder 13, the work brake function is not achieved.

즉, 이상과 같은 종래의 브레이크 모드전환 시스템에서 작업모드로 전환시 실제적으로는 작업모드 전환스위치(12) 조작과 함께 브레이크 페달(15) 조작등 두 번에 걸친 조작이 필요하게 되므로, 작업하기에 불편하며 지속적인 작업시 운전자기 피로감을 느끼게 될 뿐만 아니라, 브레이크페달(15)을 밟은 상태에서 모드전환 스위치(12)의 작업모드로의 전환시에는 작업모드 전환스위치(12)만의 조작에 의해 작업브레이크 기능이 이루어지므로 일관성없는 작업이 되어, 작업자의 혼동초래 및 안전사고를 유발할 수 있는 문제점이 있었다.That is, when switching to the work mode in the conventional brake mode switching system as described above, since the operation of the brake pedal 15 is required in addition to the operation of the operation mode switching switch 12, it is necessary to work. Not only does the driver feel fatigue during uncomfortable and continuous work, but also when the mode switch 12 is switched to the work mode while the brake pedal 15 is pressed, the work brake is operated only by the operation mode switch 12. Since the function is made inconsistent work, there was a problem that can cause confusion and safety accidents of workers.

본 고안은 이상과 같은 문제점을 해결코자 안출된 것으로서, 모드전환 스위치에 의해 작동되는 3개의 솔레노이드밸브와 체크밸브를 조합구성하여, 주행모드에서 브레이크 밸브가 구동되면 어큐무레이터로부터 공급된 압유가 상기 브레이크 밸브를 통해 액슬브레이크 실린더로 공급되며, 작업모드에서는 브레이크 밸브가 구동되면 어큐무레이터로부터 직접 액슬브레이크 실린더로 공급되도록 하여 항상 작업모드전환스위치만의 조작으로 용이하게 브레이크 모드가 전환되도록 하여 작업피로감소 및 작업안전성 증대에 그 목적이 있는 것이다.The present invention has been made to solve the above problems, comprising a combination of the three solenoid valve and the check valve operated by the mode changeover switch, when the brake valve is driven in the running mode the pressure oil supplied from the accumulator It is supplied to the axle brake cylinder through the brake valve.In the working mode, when the brake valve is driven, it is directly supplied from the accumulator to the axle brake cylinder, so that the brake mode can be easily switched by always operating only the operation mode switching switch. Its purpose is to reduce and increase work safety.

첨부된 도면에 의해서 본 고안 내용을 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

펌프(1)와 다수의 어큐무레이터들(5)이 연결되고, 상기 어큐무레이터는 프레이크 페달(15)에 의해 동작되는 브레이크밸브들(11a,11b)과 연결되며, 상기 브레이크 밸브들은 각각 솔레노이드밸브(10a,10b)들과 연결되어 액슬브레이크 실린더들(13a,13b)과 연결되어 있고, 어큐무레이터(5)와 연결된 또 다른 솔레노이드밸브(6)는 감압밸브(7)과 연결되고 체크밸브(9a,9b)에 분기연결되어, 상기 솔레노이드밸브(10a,10b)로부터 액슬브레이크실린더(13a,13b)사이의 유로에 연결되어 있으며, 상기한 솔레노이드밸브들 (6,10a,10b)은 모드전원스위치(12)의 전기신호에 대해 작동되도록 모드전환스위치(12)와 각각 연결되어 있다.A pump 1 and a plurality of accumulators 5 are connected, and the accumulators are connected with brake valves 11a and 11b operated by the rake pedal 15, the brake valves respectively being solenoids. Another solenoid valve 6 connected to the valves 10a and 10b and connected to the axle brake cylinders 13a and 13b and connected to the accumulator 5 is connected to the pressure reducing valve 7 and a check valve. Branched to 9a, 9b, and connected to a flow path between the solenoid valves 10a, 10b and axle brake cylinders 13a, 13b, wherein the solenoid valves 6, 10a, 10b are mode power supplies. It is connected to the mode switching switch 12 so as to operate on the electrical signal of the switch 12, respectively.

상기한 솔레노이드밸브들(6,10a,10b)은 2포트 2포지션밸브로서 일측은 유로가 개통되어 있으며, 타측은 유로사이에 체크밸브가 연결되어 있다.The solenoid valves 6, 10a, and 10b are two-port two-position valves, one side of which opens a flow path, and the other side of which the check valve is connected between the flow paths.

이와같이 구성된 본 고안은, 작업자가 운전석에서 모드전환스위치(12)를 주행모드에 놓으면 3개의 솔레노이드밸브들(6,10a,10b)에 전원이 공급되지 않으며, 작업자가 주행중 브레이크페달(15)을 밟아 브레이크밸브(11a,11b)를 작동시키면 어큐무레이터(5)로부터의 압유가 브레이크밸브들(11a,11b)과 솔레노이드밸브들(10a,10b)을 경유하여 액슬브레이크 실린더(13a,13b)에 공급되므로 브레이크가 작동되며, 작업자가 브레이크페달(15)에서 발을 뗄 경우 역으로 액슬브레이크 실린더내의 압유가 솔레노이드밸브들(10a,10b)과 브레이크밸브들(11a,11b)을 경유하여 유압탱크(14)로 드레인된다.According to the present invention, the three solenoid valves 6, 10a, and 10b are not supplied with power when the operator places the mode changeover switch 12 in the driver's seat, and the operator steps on the brake pedal 15 while driving. When the brake valves 11a and 11b are operated, the hydraulic oil from the accumulator 5 is supplied to the axle brake cylinders 13a and 13b via the brake valves 11a and 11b and the solenoid valves 10a and 10b. Therefore, the brake is operated, and when the worker takes off the brake pedal 15, the hydraulic oil in the axle brake cylinder is reversed through the solenoid valves 10a and 10b and the brake valves 11a and 11b. Drain).

또한, 모드전환스위치(12)를 작업모드에 놓으면 3개의 솔레노이드밸브(6,10a,10b)에 전원이 공급되어 작동되는데, 이때 어큐무레이터(5)로부터의 압유가 솔레노이드밸브(6), 감압밸브(7), 체크밸브들(9a,9b)을 경유하여 바로 액슬브레이크실린더(13a,13b)에 공급되므로, 브레이크페달(15)의 조작과 무관하게 작업브레이브가 작동되며, 작업브레이크를 해제시키기 위해서는 작업자가 모드전환스위치(12)를 주행모드로 전환시키면서 솔레노이드 밸브(6)에 전원이 차단되어 복귀되므로, 어큐무레이터(5)로부터 액슬브레이크실린더(13a,13b)로의 압유공급이 차단되고, 액슬브레이크 실린더(13a,13b)내에 있던 압유가 솔레노이드밸브들(10a,10b)과, 브레이크밸브들(11a,11b)을 경유하여 유압탱크(14)로 드레인되어 작업브레이크가 해제된다.In addition, when the mode changeover switch 12 is placed in the working mode, power is supplied to the three solenoid valves 6, 10a, and 10b, and the pressure oil from the accumulator 5 is reduced to the solenoid valve 6, and the pressure is reduced. Since the valve 7 and the check valves 9a and 9b are directly supplied to the axle brake cylinders 13a and 13b, the work brake is operated irrespective of the operation of the brake pedal 15 and the work brake is released. In order for the operator to switch the mode switching switch 12 to the driving mode, the solenoid valve 6 is shut off and returned, so that the oil pressure supply from the accumulator 5 to the axle brake cylinders 13a and 13b is cut off. The hydraulic oil in the axle brake cylinders 13a and 13b is drained to the hydraulic tank 14 via the solenoid valves 10a and 10b and the brake valves 11a and 11b to release the work brake.

이와같이 된 본 고안은 주행모드에서 브레이크 사용할 때에는 어큐무레이트(5)로부터 공급된 압유가 브레이크밸브들(11a,11b)을 경유하여 액슬브레이크 실린더(13a,13b)에 공급되며, 작업모드에서 브레이크 사용시에는 어큐무레이터(5)의 압유가 바로 액슬 브레이크실린더(13a,13b)로 공급되도록 되어 있으므로, 종래의 브레이크모드전환시스템과는 달리 작업브레이크 작동이 브레이크 페달을 밟을 필요없이 모드전환스위치(12)만을 조작함에 의해 간단히 이루어지게 되어, 작업이 간편해지고, 작업안전성이 증대되는 효과적인 고안이다.According to the present invention, when the brake is used in the traveling mode, the hydraulic oil supplied from the accumulator 5 is supplied to the axle brake cylinders 13a and 13b via the brake valves 11a and 11b, and when the brake is used in the working mode. Since the pressure oil of the accumulator 5 is directly supplied to the axle brake cylinders 13a and 13b, unlike the conventional brake mode switching system, the work brake operation does not need to step on the brake pedal and thus the mode switching switch 12 Simple operation is achieved by manipulating the bay, making the work simple and increasing the safety of the work.

Claims (2)

어큐무레이터(5)의 유압이 브레이크밸브(11)를 통해 액슬브레이크 실린더(13a,13b)에 공급되며, 모드전환스위치(12)에 의해 솔레노이드 밸브(6)가 구동되면 액슬브레이크 실린더(13)로부터 유압탱크(14)로 드레인되는 유로가 개페제어되어 브레이크 모드가 전환되는 브레이크 모드전환 시스템에 있어서, 솔레노이드 밸브들(10a,10b)이 각각 브레이크밸브들(11a,11b)과 액슬브레이크 실린더(13a,13b)사이에 연결되고, 어큐무레이터(5)와 연결된 또다른 솔레노이드밸브(6)는 감압밸브(7)와 연결되고 체크밸브들(9a,9b)에 분기연결되어, 상기 솔레노이드밸브들(10a,10b)로부터 액슬브레이크실린더(13a,13b)사이의 유로에 연결되고, 상기 솔레노이드밸브들(6,13a,13b)은 모드전환스위치(12)의 전기신호에 대해 작동되도록 상기 모드전환스위치(12)와 각각 연결된 것을 특징으로 하는 브레이크모드 전환시스템.The hydraulic pressure of the accumulator 5 is supplied to the axle brake cylinders 13a and 13b through the brake valve 11, and when the solenoid valve 6 is driven by the mode changeover switch 12, the axle brake cylinder 13 In the brake mode switching system in which the flow path drained from the hydraulic tank 14 to the hydraulic tank 14 is controlled, the solenoid valves 10a and 10b are brake valves 11a and 11b and the axle brake cylinder 13a, respectively. And another solenoid valve 6 connected between the accumulator 5 and the accumulator 5 is connected to the pressure reducing valve 7 and branched to the check valves 9a and 9b. 10a, 10b is connected to the flow path between the axle brake cylinders 13a, 13b, and the solenoid valves 6, 13a, 13b are operated in response to an electrical signal of the mode changeover switch 12. 12) and characterized in that each connected Lake mode switching system. 제1항에 있어서, 솔레노이드밸브들(6,13a,13b)이 2포트 2포지션 밸브로서 일측은 유로가 개통되어 있고, 타측은 유로사이에 체크밸브가 연결된 것을 특징으로 하는 브레이크모드 전환 시스템.2. The brake mode switching system according to claim 1, wherein the solenoid valves (6, 13a, 13b) are two-port two-position valves, one side of which has a passage opening, and the other side of which has a check valve connected between the passages.
KR2019940029951U 1994-11-11 1994-11-11 Brake mode converting system KR960009980Y1 (en)

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