KR101660047B1 - Multi Function Breaking Pressure Generating Device - Google Patents

Multi Function Breaking Pressure Generating Device Download PDF

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Publication number
KR101660047B1
KR101660047B1 KR1020100107232A KR20100107232A KR101660047B1 KR 101660047 B1 KR101660047 B1 KR 101660047B1 KR 1020100107232 A KR1020100107232 A KR 1020100107232A KR 20100107232 A KR20100107232 A KR 20100107232A KR 101660047 B1 KR101660047 B1 KR 101660047B1
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South Korea
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pedal
hydraulic pressure
piston
reaction force
master cylinder
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KR1020100107232A
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Korean (ko)
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KR20120045599A (en
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이상목
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현대모비스 주식회사
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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
    • 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
    • B60T13/143—Master cylinder mechanically coupled with booster
    • 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
    • B60T8/32—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 a speed condition, e.g. acceleration or deceleration
    • B60T8/34—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 a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—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 a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking
    • B60T8/4077—Systems in which the booster is used as an auxiliary pressure source
    • 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
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • 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
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • B60T17/22—Devices for monitoring or checking brake systems; Signal devices
    • B60T17/221—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems
    • B60T17/222—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems by filling or bleeding of hydraulic systems
    • B60T17/223—Devices for pressurising brake systems acting on pedal
    • 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
    • B60T8/32—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 a speed condition, e.g. acceleration or deceleration
    • B60T8/34—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 a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—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 a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking
    • B60T8/4081—Systems with stroke simulating devices for driver input
    • 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
    • B60T8/32—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 a speed condition, e.g. acceleration or deceleration
    • B60T8/34—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 a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—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 a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking
    • B60T8/4081—Systems with stroke simulating devices for driver input
    • B60T8/4086—Systems with stroke simulating devices for driver input the stroke simulating device being connected to, or integrated in the driver input device
    • 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
    • B60T8/32—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 a speed condition, e.g. acceleration or deceleration
    • B60T8/34—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 a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/42—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 a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition having expanding chambers for controlling pressure, i.e. closed systems
    • B60T8/4208—Debooster systems
    • B60T8/4266—Debooster systems having an electro-mechanically actuated expansion unit, e.g. solenoid, electric motor, piezo stack
    • 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
    • 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
    • B60T2270/00—Further aspects of brake control systems not otherwise provided for
    • B60T2270/40—Failsafe aspects of brake control systems

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Regulating Braking Force (AREA)
  • Braking Elements And Transmission Devices (AREA)
  • Braking Systems And Boosters (AREA)

Abstract

본 발명의 제동유압발생장치는 페달(31)의 스트로크에 따라 요구되는 제동압력을 산출하는 ECU(30)를 통해 제어되는 전동부스터(1)로 구동되어 유압을 발생시키는 1개의 마스터실린더(6)와, 페달(31)에 의해 밀려나면서 페달(31)쪽으로 반력을 전달하고 상기 전동부스터(1)의 페일(Fail)시 상기 마스터실린더(6)를 작동시켜 페일-세이프(Fail-Safe)를 구현하는 페달시뮬레이터(20)로 구성됨으로써, 전동부스터 방식 제동장치가 1개의 마스터실린더(6)로도 회생제동과 페일-세이프(Fail-Safe)를 구현할 수 있고 솔레노이드 밸브의 미사용으로 구조를 단순화하고 제조원가도 절감할 수 있게 된다.The braking hydraulic pressure generating device of the present invention includes one master cylinder 6 driven by an electric booster 1 controlled through an ECU 30 for calculating the required braking pressure according to the stroke of the pedal 31 to generate hydraulic pressure, And transmits the reaction force toward the pedal 31 while being pushed by the pedal 31 and operates the master cylinder 6 when the electric booster 1 fails to implement fail-safe And the pedal simulator 20 is configured so that the electric booster system braking system can realize regenerative braking and fail-safe even with one master cylinder 6, and the solenoid valve is not used to simplify the structure, .

Description

다기능 제동유압발생장치{Multi Function Breaking Pressure Generating Device} {Multi Function Breaking Pressure Generating Device}

본 발명은 차량의 제동유압발생장치에 관한 것으로, 특히 전동부스터 방식 제동장치에 적용되는 다기능 제동유압발생장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a braking hydraulic pressure generating device for a vehicle, and more particularly to a multifunctional braking hydraulic pressure generating device applied to an electric booster braking device.

일반적으로 유압을 이용해 차량을 제동하는 브레이크시스템은 브레이크페달의 조작력을 부스터로 배력해 마스터실린더로 전달함으로써, 상기 마스터실린더를 통해 제동유압을 형성하게 된다.Generally, in a brake system that brakes a vehicle using hydraulic pressure, the operating force of the brake pedal is boosted by a booster and transmitted to a master cylinder, thereby forming a braking hydraulic pressure through the master cylinder.

반면에 전동부스터 방식 제동장치는 모터로 유압을 형성하는 제1마스터실린더와 페달로 작동되어 유압을 형성하는 제2마스터실린더가 구비되고, 상기 2개의 마스터실린더간 협조제어로 회생제동을 구현하는 방식이다.On the other hand, the electric booster type braking device includes a first master cylinder that forms a hydraulic pressure by a motor and a second master cylinder that operates as a pedal to form a hydraulic pressure, and a method of implementing regenerative braking by the cooperation control between the two master cylinders to be.

상기와 같은 전동부스터 방식 제동장치에는 페달쪽으로 페달 스트로크에 따른 반력을 제공해 페달을 조작하고 있는 페달답력을 느끼게 하는 페달시뮬레이터가 구비되어진다.The electric booster braking system as described above is provided with a pedal simulator for providing a reaction force due to the pedal stroke toward the pedal side to make the pedal operation feeling of the pedal operating.

또한, 마스터실린더와 휠쪽을 이어주는 유압 라인으로 다수의 솔레노이드밸브를 설치함으로써, 전기적 페일(Fail)이나 유로 연결부의 페일(Fail)시 페일-세이프(Fail-Safe)를 구현하게 된다.In addition, by providing a plurality of solenoid valves as the hydraulic line connecting the master cylinder and the wheel, fail-safe can be realized in the event of an electrical failure or failure of the oil line connection portion.

하지만, 상기와 같이 전동부스터 방식 제동장치는 2개의 마스터실린더와 1개의 페달시뮬레이터 및 유압 라인에 설치된 다수의 솔레노이드밸브를 기본적인 구성요소로 필요로 함에 따라, 제동장치의 부피와 중량의 증가뿐만 아니라 생산단가 상승은 물론 유압 라인이 복잡해질 수밖에 없게 된다. However, since the electric booster braking system as described above requires two master cylinders, one pedal simulator, and a plurality of solenoid valves installed in the hydraulic line as basic components, it is necessary to increase the volume and weight of the braking apparatus, The increase in unit price and the hydraulic line will be complicated.

상기와 같은 제반 문제는 특히 2개의 마스터실린더를 이용해 회생제동과 페일-세이프(Fail-Safe)를 구현하는 방식에 의해 기인되어진다.
The above-described problems are caused by a method of implementing regenerative braking and fail-safe using two master cylinders.

이에 상기와 같은 점을 감안하여 발명된 본 발명은 전동부스터로 작동되어 유압을 발생하는 1개의 마스터실린더가 페일-세이프(Fail-Safe)의 구현시 비 유압 반력을 제공하는 페달시뮬레이터로 작동됨으로써, 1개의 마스터실린더만으로도 전동부스터 방식 제동장치를 구성할 수 있는 다기능 제동유압발생장치를 제공하는데 목적이 있다.
In view of the above, the present invention, which is invented in view of the above, operates as a pedal simulator in which one master cylinder that operates as an electric booster and generates hydraulic pressure provides a non-hydraulic reaction force when fail-safe is implemented, It is an object of the present invention to provide a multi-function braking hydraulic pressure generating device capable of constituting an electric booster braking device even with only one master cylinder.

상기와 같은 목적을 달성하기 위한 본 발명의 다기능 제동유압발생장치는 페달의 스트로크에 따라 요구되는 제동압력을 산출하는 ECU를 통해 제어되어 동력을 발생시키는 전동부스터와;According to an aspect of the present invention, there is provided a multifunctional braking hydraulic pressure generator comprising: an electric booster for generating power by being controlled by an ECU for calculating a braking pressure required according to a stroke of a pedal;

상기 전동부스터를 통한 작동으로 유압을 발생시키는 마스터실린더와; A master cylinder for generating hydraulic pressure by operation through the electric booster;

상기 페달의 입력으로 밀려나는 이동거리가 구속되어 상기 페달쪽으로 반력을 전달하고, 상기 전동부스터의 페일(Fail)시 상기 마스터실린더에서 유압이 발생되도록 상기 페달의 스트로크에 따라 밀려나 상기 전동부스터를 작동시켜 페일-세이프(Fail-Safe)를 구현하는 페달시뮬레이터;The moving distance pushed by the input of the pedal is restrained to transmit the reaction force to the pedal and the hydraulic booster is pushed along the stroke of the pedal to generate hydraulic pressure in the master cylinder at the time of failure of the motor booster, A pedal simulator implementing fail-safe;

를 포함해 구성되어진 것을 특징으로 한다.And a control unit.

상기 전동부스터는 상기 ECU를 통해 제어되고 구동되는 모터와, 커넥터에 결합되어 상기 모터의 회전을 상기 마스터실린더를 가압하는 직선이동으로 전환시켜주는 진퇴이동기로 구성되어진다.The motor booster is composed of a motor controlled and driven through the ECU and a forward / backward moving unit coupled to the connector and switching the rotation of the motor to linear movement for pressing the master cylinder.

상기 마스터실린더는 상기 전동부스터를 통해 전진이동되어 유압을 형성하고, 형성된 유압을 제1·2배출구로 배출시켜주는 피스톤이동체를 갖추어 구성되어진다.The master cylinder includes a piston moving body that moves forward through the electric booster to form a hydraulic pressure and to discharge the formed hydraulic pressure to the first and second outlets.

상기 페달시뮬레이터는 상기 페달과 함께 움직이는 상기 피스톤의 구속시 이동을 차단하고, 상기 피스톤의 구속 해제시 이동을 허용하는 이동구속부재와; 상기 이동구속부재에 의한 이동구속시 상기 피스톤을 통해 가압되어 상기 페달쪽으로 전달되는 반력을 상기 피스톤으로 전달하고, 상기 이동구속부재에 의한 이동구속해제시 상기 피스톤과 함께 밀려나 상기 전동부스터을 작동시켜 주는 반력형성부재; 로 구성되어진다.The pedal simulator includes a movement restraining member for blocking movement of the piston moving together with the pedal while restraining the pedal, and allowing movement when releasing the restraint of the piston; A reaction force that is transmitted through the piston to the pedal when it is restrained by the movement restraining member and transmitted to the pedal is transmitted to the piston while being pushed together with the piston when the movement restraining member is released from movement restraint, Forming member; .

상기 이동구속부재는 상기 피스톤과 함께 이동되는 스토퍼와, 인입로드의 인출시 상기 스토퍼를 구속해 상기 피스톤의 움직임을 구속하는 솔레노이드로 구성되어진다.The movement restraining member includes a stopper that moves together with the piston, and a solenoid that restrains the stopper when the pull rod is pulled out to restrain the movement of the piston.

상기 반력형성부재는 직선이동되는 가압로드에 지지되고 상기 피스톤에 의해 밀려나는 가압력을 받는 탄성체와, 상기 탄성체를 탄발지지하는 리턴스프링으로 구성되어진다.
The reaction force generating member is composed of an elastic body supported by a linearly moving pressing rod and receiving a pressing force pushed by the piston, and a return spring elastically supporting the elastic body.

이러한 본 발명은 마스터실린더가 전동부스터와 페달로 조작되는 페달시뮬레이터를 통해서도 작동되어 전동부스터 방식 제동장치의 마스터실린더를 1개만으로도 구성할 수 있는 효과가 있게 된다.The present invention is also effective in that the master cylinder is also operated through a pedal simulator operated by an electric booster and a pedal, so that only one master cylinder of the electric booster braking system can be constituted.

또한, 본 발명은 페달시뮬레이터와 연계된 1개의 마스터실린더로 페일-세이프(Fail-Safe)를 구현하므로 솔레노이드밸브를 설치하지 않은 단순한 유압라인의 구축이 가능하고, 부품수량 감소와 원가절감에도 크게 기여할 수 있는 효과가 있게 된다.
In addition, since the present invention implements fail-safe with one master cylinder connected to a pedal simulator, it is possible to construct a simple hydraulic line without a solenoid valve, thereby contributing to a reduction in the number of parts and a cost reduction The effect can be.

도 1은 본 발명에 따른 다기능 제동유압발생장치의 구성도이고, 도 2는 본 발명에 따른 다기능 제동유압발생장치를 적용한 전동부스터 방식 제동장치의 회생제동작동도이며, 도 3은 본 발명에 따른 제동유압발생장치를 적용한 전동부스터 방식 제동장치의 페일-세이프(Fail-Safe)작동도이다.2 is a regenerative braking operation diagram of an electric booster braking system to which the multifunctional braking hydraulic pressure generating apparatus according to the present invention is applied, and Fig. 3 is a view showing the regenerative braking operation of the multi- Fail-safe operation diagram of an electric booster braking system using a braking hydraulic pressure generator.

이하 본 발명의 실시예를 첨부된 예시도면을 참조로 상세히 설명하며, 이러한 실시예는 일례로서 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 여러 가지 상이한 형태로 구현될 수 있으므로, 여기에서 설명하는 실시예에 한정되지 않는다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which illustrate exemplary embodiments of the present invention. The present invention is not limited to these embodiments.

도 1은 본 실시예에 따른 다기능 제동유압발생장치의 구성도를 나타낸다.Fig. 1 shows a configuration diagram of a multifunctional braking hydraulic pressure generating device according to the present embodiment.

도시된 바와 같이, 상기 다기능 제동유압발생장치는 페달의 스트로크에 따라 요구되는 제동압력을 산출하는 ECU를 통해 제어되는 전동부스터(1)와, 상기 전동부스터(1)를 통해 구동되어 유압을 발생시키도록 오일리저버(5)를 갖추고 유압을 배출하는 한쌍의 제1·2배출구(8a,8b)를 갖춘 마스터실린더(6)와, 페달에 의해 밀려나면서 페달쪽으로 반력을 전달하고 상기 전동부스터(1)의 페일(Fail)시 상기 마스터실린더(6)를 작동시켜 페일-세이프(Fail-Safe)를 구현하는 페달시뮬레이터(20)로 구성되어진다.As shown in the figure, the multifunctional braking hydraulic pressure generator includes an electric booster 1 controlled by an ECU that calculates a braking pressure required according to a stroke of the pedal, and a hydraulic booster 1 driven through the electric booster 1 to generate hydraulic pressure A master cylinder 6 having a pair of first and second outlets 8a and 8b provided with an oil reservoir 5 for discharging hydraulic pressure and a master cylinder 6 for transmitting a reaction force toward the pedal while being pushed by the pedal, And a pedal simulator 20 for activating the master cylinder 6 to fail-safe when the pedal fails.

상기 전동부스터(1)는 ECU를 통해 제어되고 구동되는 모터(2)와, 커넥터(3)에 결합되어 상기 모터(2)의 회전을 전후직선이동으로 전환시켜 마스터실린더(6)를 작동하는 진퇴이동기(4)로 구성되어진다.The motor booster 1 includes a motor 2 controlled and driven by an ECU and a motor 3 driven by the motor 3 so as to rotate the motor 2 forward and backward, And a mobile device 4.

상기 진퇴이동기(4)는 스크류-너트 구조로 되어 있는 스핀들이 모터(2)의 회전력을 받아 직선운동으로 변환시켜 마스터실린더를 가압하는 구조이며, 이는 NSL(Non - Self Locking)타입과 같이 통상적인 구조도 적용되어진다.The forward / backward movement unit 4 has a structure in which a spindle having a screw-nut structure receives the rotational force of the motor 2 and converts the rotational force into linear motion to press the master cylinder. This is a type of NSL (Non-Self Locking) The structure is also applied.

상기 마스터실린더(6)는 전동부스터(1)를 통해 전진이동되어 유압을 형성하고, 형성된 유압을 제1·2배출구(8a,8b)로 배출시켜주는 피스톤이동체(7)로 구성되어진다.The master cylinder 6 is constituted by a piston moving body 7 that moves forward through the electric booster 1 to form a hydraulic pressure and to discharge the formed hydraulic pressure to the first and second outlets 8a and 8b.

상기 페달시뮬레이터(20)는 페달과 함께 움직이는 입력로드(12)에 구비된 피스톤(13)을 수용한 페달실린더(10)에 연결된 실린더하우징(21)과, 상기 실린더하우징(21)의 내부에서 입력로드(12)에 구비된 피스톤(13)을 통해 이동되고 상기 피스톤(13)쪽으로 반력을 전달하는 반력형성부재와, 상기 반력형성부재의 전진이동을 제한하는 이동구속부재로 구성되어진다.The pedal simulator 20 includes a cylinder housing 21 connected to a pedal cylinder 10 accommodating a piston 13 provided in an input rod 12 moving together with a pedal, A reaction force forming member which is moved through the piston 13 provided in the rod 12 and transmits a reaction force toward the piston 13 and a movement restraining member which restricts the forward movement of the reaction force generating member.

상기 페달실린더(10)는 입력로드(12)에 구비된 피스톤(13)을 수용한 실린더하우징(11)을 구비하지만, 상기 실린더하우징(11)은 페달시뮬레이터(20)의 실린더하우징(21)과 일체로 형성될 수 있다.The pedal cylinder 10 has a cylinder housing 11 accommodating a piston 13 provided in the input rod 12 and the cylinder housing 11 is connected to the cylinder housing 21 of the pedal simulator 20 Or may be integrally formed.

상기 반력형성부재는 직선이동되는 가압로드(22)와, 상기 가압로드(22)에 의해 압축변형되고 입력로드(12)의 피스톤(13)쪽으로 반력을 전달하는 탄성체(23)와, 상기 탄성체(23)를 탄발지지하는 리턴스프링(24)으로 구성되어진다.The reaction force generating member includes a pressing rod 22 that is linearly moved, an elastic body 23 that is compressively deformed by the pressing rod 22 and transmits a reaction force toward the piston 13 of the input rod 12, And a return spring 24 for elastically supporting the spring member 23.

상기 반력형성부재는 이동구속부재의 작동시 이동거리의 제한으로 페달로 반력을 전달하는 페달시뮬레이터로서 작동되지만, 이동구속부재의 미작동시 이동거리의 미 제한으로 페달의 움직임으로 전동부스터(1)를 작동시켜주는 동력원으로서 작용되어진다. The reaction force generating member is operated as a pedal simulator that transmits a reaction force to the pedal due to the limitation of the movement distance of the movement restricting member during operation, As shown in Fig.

상기 이동구속부재는 페달에 연동되어 움직이는 입력로드(12)의 피스톤(13)에 구비되어진 스토퍼(14)와, 인입로드(25a)의 인출시 상기 스토퍼(14)를 구속해 피스톤(13)의 움직임을 구속하는 솔레노이드(25)로 구성되어진다.The movement restraining member includes a stopper 14 provided on a piston 13 of an input rod 12 interlocked with a pedal and a stopper 14 restraining the stopper 14 when the inlet rod 25a is pulled out, And a solenoid 25 for restricting motion.

상기 솔레노이드(25)는 ECU를 이용해 온/오프 제어되어지고, 전기가 공급된 정상상태에서 인입로드(25a)가 인출된 상태를 갖는다.The solenoid 25 is on / off controlled by an ECU and has a state in which the inlet rod 25a is drawn out in a steady state in which electricity is supplied.

도 2는 본 실시예에 따른 다기능 제동유압발생장치를 적용한 전동부스터 방식 제동장치를 나타낸다.2 shows an electric booster system braking apparatus to which the multifunctional braking hydraulic pressure generating apparatus according to the present embodiment is applied.

도시된 바와 같이, 본 실시예에 따른 다기능 제동유압발생장치는 전동부스터(1)가 페달센서(32)의 신호를 받는 ECU(30)에 연결되고, 마스터실린더(6)의 제1·2배출구(8a,8b)가 전륜과 후륜의 휠실린더(50)로 제동압을 분배하는 ESC(40, Electronic Stability Control)로 연결되며, 페달시뮬레이터(20)는 페달(31)에 연동되어 움직이는 입력로드(12)를 통해 페달(31)과 연결되어진다.As shown in the drawing, the multifunctional braking hydraulic pressure generator according to the present embodiment is characterized in that the electric booster 1 is connected to the ECU 30 receiving the signal of the pedal sensor 32, The pedal simulator 20 is connected to an input rod (not shown) that moves in conjunction with the pedal 31. The pedal simulator 20 is connected to an ESC (Electronic Stability Control) 40 that distributes braking pressure to wheel cylinders 50 of front and rear wheels, 12 to the pedal 31. [

상기와 같이 다기능 제동유압발생장치를 적용한 제동장치가 회생제동(Regenerative Braking)을 구현하면, ECU(30)가 센서(32)에서 검출된 페달(31)의 스트로크를 이용해 전동부스터(1)를 구동하게 되고, 상기 전동부스터(1)의 회전은 스크류-너트 구조의 진퇴이동기(4)를 통해 마스터실린더(6)로 전달됨으로써 마스터실린더(6)를 작동시켜 주게 된다.When the braking device using the multifunctional braking hydraulic pressure generator as described above implements regenerative braking, the ECU 30 drives the electric booster 1 using the stroke of the pedal 31 detected by the sensor 32 And the rotation of the electric booster 1 is transmitted to the master cylinder 6 through the screw-nut structure forward / backward movement device 4, thereby operating the master cylinder 6. [

이때, 상기 ECU(30)는 센서(32)를 통해 검출된 페달(31)의 스트로크에 따른 요구 제동압을 산출하고, 산출된 제동압을 발생시킬 수 있도록 전동부스터(1)를 구동하게 된다.At this time, the ECU 30 calculates the demand braking pressure according to the stroke of the pedal 31 detected through the sensor 32, and drives the electric booster 1 so as to generate the calculated braking pressure.

상기 마스터실린더(6)의 작동으로 발생된 유압은 한쌍의 제1·2유압라인(8a,8b)을 통해 ESC(40)로 공급되고, 상기 ESC(40)에서 분배되어진 유압은 전륜과 후륜을 제동하는 휠실린더(50)로 공급되어 제동이 이루어지게 된다.The hydraulic pressure generated by the operation of the master cylinder 6 is supplied to the ESC 40 through a pair of first and second hydraulic lines 8a and 8b and the hydraulic pressure distributed from the ESC 40 is transmitted to the front and rear wheels And supplied to the wheel cylinder 50 for braking to perform braking.

상기와 같은 마스터실린더(6)를 통한 회생제동시 페달(31)에는 페달시뮬레이터(20)를 통한 반력이 전달되고, 이러한 페달시뮬레이터(20)를 통한 반력으로 운전자는 페달답력을 느끼게 된다.When the regenerative braking is performed through the master cylinder 6 as described above, a reaction force is transmitted to the pedal 31 through the pedal simulator 20, and the driver feels the pedal pressure due to the reaction force through the pedal simulator 20.

이때, 솔레노이드(25)는 ECU(30)에 의해 온되어 인입로드(25a)가 인출된 상태(K)이고, 이로 인해 페달(31)에 연동되어 움직이는 입력로드(12)의 피스톤(13)에 구비되어진 스토퍼(14)는 상기 솔레노이드(25)의 인입로드(25a)에 의해 구속됨으로써 페달(31)의 스트로크 증가에 따라 이동될 수 없게된다.At this time, the solenoid 25 is in a state (K) in which the inlet rod 25a is drawn out by the ECU 30 so that the piston 13 of the input rod 12 moving in conjunction with the pedal 31 The provided stopper 14 can not be moved in accordance with an increase in the stroke of the pedal 31 by being restrained by the inlet rod 25a of the solenoid 25. [

이에 따라, 페달시뮬레이터(20)는 페달(31)에 연동되어 움직이는 입력로드(12)의 피스톤(13)이 가하는 힘을 직접 받지만, 상기 피스톤(13)의 전진이동을 차단하게 된다.Accordingly, the pedal simulator 20 directly receives the force exerted by the piston 13 of the input rod 12 moving in conjunction with the pedal 31, but blocks the forward movement of the piston 13.

상기와 같은 상태에서 페달(31)의 스트로크 진행에 따라 더욱 밀려나는 피스톤(13)이 가압로드(22)에 의해 지지된 탄성체(23)를 가압하게 되고, 상기 탄성체(23)는 탄성영역을 넘어서는 가압력에서 피스톤(13)쪽으로 반력을 전달하게 된다.In this state, the piston 13, which is pushed further by the stroke of the pedal 31, presses the elastic body 23 supported by the pressing rod 22, and the elastic body 23 moves beyond the elastic region The reaction force is transmitted to the piston 13 from the pressing force.

상기 탄성체(23)로부터 피스톤(13)에 전달되는 반력은 이에 연결된 입력로드(12)로 전달되고, 상기 입력로드(12)로 전달된 반력은 이에 연결되어진 페달(31)로 전달됨으로써 운전자는 페달답력을 느낄수 있게 된다.The reaction force transmitted from the elastic member 23 to the piston 13 is transmitted to the input rod 12 connected to the piston 13. The reaction force transmitted to the input rod 12 is transmitted to the pedal 31 connected to the input rod 12, You can feel your strength.

도 3은 본 실시예에 따른 제동유압발생장치를 적용한 전동부스터 방식 제동장치의 페일-세이프(Fail-Safe)의 작동상태를 나타낸다.3 shows a fail-safe operating state of the electric booster braking system to which the braking hydraulic pressure generating device according to the present embodiment is applied.

도시된 바와 같이, 전기적인 페일(Fail)시 전동 부스터(1)의 구동이 멈추고 동시에 솔레노이드(25)의 오프로 인입로드(25a)는 인입된 상태로 전환되어진다.As shown in the figure, the driving of the electric booster 1 is stopped at the time of an electrical failure, and at the same time, the off-lead rod 25a of the solenoid 25 is switched to the drawn state.

상기와 같이 솔레노이드(25)의 인입로드(25a)에 의한 구속이 없게 되면, 페달(31)에 연동되어 움직이는 입력로드(12)의 피스톤(13)에 구비되어진 스토퍼(14)는 아무런 구속 없이 페달(31)의 스트로크 증가에 따라 이동될 수 있게된다.The stopper 14 provided on the piston 13 of the input rod 12 which moves in conjunction with the pedal 31 moves in the direction of the pedal 31 without any restraint, As the stroke of the piston 31 increases.

이에 따라, 페달시뮬레이터(20)는 페달(31)에 연동되어 움직이는 입력로드(12)의 피스톤(13)이 가하는 힘을 직접 받아 이동됨으로써, 상기 페달시뮬레이터(20)가 전동부스터(1)를 직접 작동시켜주게 된다.Accordingly, the pedal simulator 20 directly receives the force applied by the piston 13 of the input rod 12 moving in conjunction with the pedal 31, so that the pedal simulator 20 can directly move the electric booster 1 .

상기와 같은 페달시뮬레이터(20)의 상태에서는 페달(31)의 스트로크 진행으로 더욱 밀려나는 피스톤(13)을 통해 탄성체(23)가 리턴스프링(24)을 압축하면서 이동되고, 상기 탄성체(23)의 이동은 가압로드(22)를 전동부스터(1)쪽으로 밀어주게 된다.In the state of the pedal simulator 20 as described above, the elastic body 23 is moved while compressing the return spring 24 through the piston 13 which is pushed further by the advance of the stroke of the pedal 31, The movement pushes the pressing rod 22 toward the electric booster 1.

그러므로 상기 전동부스터(1)쪽에선 스크류-너트 구조의 진퇴이동기(4)가 가압력을 받게 되고, 상기 진퇴이동기(4)는 스크류-너트구조로 인해 전진이동되어진다.Therefore, the forward / backward moving device 4 having the screw-nut structure receives a pressing force on the side of the electric booster 1, and the forward / backward moving device 4 is moved forward due to the screw-nut structure.

즉, 페달(31)의 스트로크가 이에 연결된 연결로드(12)와 피스톤(13)을 통해 페달시뮬레이터(20)로 전달되어 페달시뮬레이터(20)를 밀어내고, 밀려나는 페달시뮬레이터(20)는 전동부스터(1)의 진퇴이동기(4)에 힘을 가해 진퇴이동기(4)를 전진이동시켜 줌으로써, 전원이 차단된 전동부스터(1)에서도 마스터실린더(6)를 가압하는 가압력을 발생시킬 수 있게 된다.That is, the pedal simulator 20, which transmits the stroke of the pedal 31 to the pedal simulator 20 via the connection rod 12 and the piston 13 connected thereto and pushes out the pedal simulator 20, It is possible to generate a pressing force for pressing the master cylinder 6 even in the electric booster 1 in which the power source is shut off by applying a force to the advancing / retracting moving device 4 of the power unit 1 to move the advancing / retracting moving device 4 forward.

상기와 같이 전원이 차단된 전동부스터(1)로부터 가압력을 받은 마스터실린더(6)에선 피스톤이동체(7)의 전진이동이 일어나고, 상기 피스톤이동체(7)의 전진이동으로 마스터실린더(6)에는 유압이 형성됨으로써 제1·2배출구(8a,8b)를 통해 로 ESC(40)로 공급되고, 상기 ESC(40)에서 분배되어진 유압은 전륜과 후륜을 제동하는 휠실린더(50)로 공급되어 제동이 이루어짐으로써 페일-세이프(Fail-Safe)를 구현할 수 있게 된다.The piston moving body 7 is moved forward in the master cylinder 6 which receives the pressing force from the electric booster 1 with the power cut off as described above and the master cylinder 6 is supplied with the hydraulic pressure Is supplied to the ESC 40 through the first and second outlets 8a and 8b and the oil pressure distributed from the ESC 40 is supplied to the wheel cylinder 50 for braking the front wheel and the rear wheel, And fail-safe can be implemented.

한편, 페달(31)의 입력이 없으면 피스톤(13)을 통한 가압력도 없어져 페달시뮬레이터(20)는 더 이상 전동부스터(1)쪽으로 밀려나지 않게 되고, 외부의 힘이 작용하지 않는 페달시뮬레이터(20)에는 단지 리턴스프링(24)의 탑성복원력 만 작용함으로써, 페달시뮬레이터(20)는 초기 상태로 복귀되어진다.If there is no input of the pedal 31, the pedal simulator 20 is no longer pushed to the motor booster 1, and the pedal simulator 20, which does not exert any external force, Only the top restoring force of the return spring 24 is applied, so that the pedal simulator 20 is returned to the initial state.

페달시뮬레이터(20)의 초기 상태로 복귀는 페달시뮬레이터(20)에 의해 밀려났던 진퇴이동기(4)도 복귀시켜 전동부스터(1)를 초기 상태로 복귀시켜줌으로써, 마스터실린더(6)에서는 유압의 발생이 없게 된다.The return to the initial state of the pedal simulator 20 also restores the forward and backward movement device 4 that was pushed by the pedal simulator 20 to return the motor booster 1 to the initial state, .

상기와 같이 본 실시예에 따른 제동유압발생장치는 페달(31)의 스트로크에 따라 요구되는 제동압력을 산출하는 ECU(30)를 통해 제어되는 전동부스터(1)로 구동되어 유압을 발생시키는 1개의 마스터실린더(6)와, 페달(31)에 의해 밀려나면서 페달(31)쪽으로 반력을 전달하고 상기 전동부스터(1)의 페일(Fail)시 상기 마스터실린더(6)를 작동시켜 페일-세이프(Fail-Safe)를 구현하는 페달시뮬레이터(20)로 구성됨으로써, 전동부스터 방식 제동장치가 1개의 마스터실린더(6)로도 회생제동과 페일-세이프(Fail-Safe)를 구현할 수 있고 솔레노이드 밸브의 미사용으로 구조를 단순화하고 제조원가도 절감할 수 있게 된다.
As described above, the braking hydraulic pressure generator according to the present embodiment is driven by the electric booster 1 controlled through the ECU 30 that calculates the braking pressure required according to the stroke of the pedal 31, The master cylinder 6 and the master cylinder 6 are operated to transmit the reaction force to the pedal 31 while being pushed by the pedal 31 and to operate the master cylinder 6 when the electric booster 1 fails, And the pedal simulator 20 that implements the brake pedal system and the pedal simulator 20. The brake booster system can realize regenerative braking and fail-safe even with one master cylinder 6, And the manufacturing cost can be reduced.

1 : 전동부스터 2 : 모터
3 : 커넥터 4 : 진퇴이동기
5 : 오일리저버 6 : 마스터실린더
7 : 피스톤이동체 8a,8b : 제1·2배출구
10 : 페달실린더 11,21 : 실린더하우징
12 : 입력로드 13 : 피스톤
14 : 스토퍼 20 : 페달시뮬레이터
22 : 가압로드 23 : 탄성체
24 : 리턴스프링 25 : 솔레노이드
25a : 인입로드
30 : ECU 31 : 페달
32 : 페달센서 40 : ESC
50 : 휠실린더 1: Electric booster 2: Motor
3: connector 4:
5: Oil reservoir 6: Master cylinder
7: Piston moving body 8a, 8b: First and second outlets
10: Pedal cylinder 11, 21: Cylinder housing
12: input rod 13: piston
14: Stopper 20: Pedal simulator
22: pressing rod 23: elastic body
24: return spring 25: solenoid
25a: incoming load
30: ECU 31: Pedal
32: pedal sensor 40: ESC
50: wheel cylinder

Claims (7)

페달의 스트로크에 따라 요구되는 제동압력을 산출하는 ECU를 통해 제어되어 동력을 발생시키는 전동부스터와;
상기 전동부스터를 통한 작동으로 유압을 발생시키는 마스터실린더와;
상기 페달의 입력으로 밀려나는 이동거리가 구속되어 상기 페달쪽으로 반력을 전달하고, 상기 전동부스터의 페일(Fail)시 상기 마스터실린더에서 유압이 발생되도록 상기 페달의 스트로크에 따라 밀려나 상기 전동부스터를 작동시켜 페일-세이프(Fail-Safe)를 구현하는 페달시뮬레이터;를 포함하고,
상기 페달시뮬레이터는 상기 페달과 함께 움직이는 피스톤의 구속과 이동이 이루어지도록 상기 피스톤에 구비된 스토퍼를 구속과 해제시켜주는 솔레노이드로 구성된 이동구속부재, 상기 이동구속부재의 구속 상태에서 상기 전동부스터를 작동시키지 않는 반면 상기 이동구속부재의 구속 해제상태에서 상기 전동부스터를 작동시켜 주는 반력형성부재로 구성되며;
상기 이동구속부재와 상기 반력형성부재는 상기 페달시뮬레이터의 실린더 하우징에 수용되며, 상기 솔레노이드의 결합위치는 상기 반력형성부재로 상기 반력이 생성되도록 상기 피스톤의 이동을 허용하는 상기 피스톤의 앞쪽이고, 상기 솔레노이드의 오프동작은 상기 반력형성부재로 상기 페일-세이프가 구현되도록 상기 솔레노이드와 분리된 상기 피스톤이 상기 반력형성부재를 밀어주는
것을 특징으로 하는 다기능 제동유압발생장치.
An electric booster for generating power by being controlled by an ECU that calculates a braking pressure required according to a stroke of the pedal;
A master cylinder for generating hydraulic pressure by operation through the electric booster;
The moving distance pushed by the input of the pedal is restrained to transmit the reaction force to the pedal and the hydraulic booster is pushed along the stroke of the pedal to generate hydraulic pressure in the master cylinder at the time of failure of the motor booster, And a pedal simulator that implements Fail-Safe,
The pedal simulator includes a movable restraining member composed of a solenoid for restraining and releasing a stopper provided on the piston so that the piston moving together with the pedal is restrained and moved, A reaction force generating member for actuating the electric booster in a restrained state of the movement restraining member,
Wherein the movement restraining member and the reaction force forming member are housed in a cylinder housing of the pedal simulator, the engagement position of the solenoid is a front side of the piston allowing the movement of the piston to generate the reaction force with the reaction force generating member, Off operation of the solenoid is performed so that the piston separated from the solenoid pushes the reaction force generating member so that the fail-safe is realized by the reaction force generating member
Wherein the braking hydraulic pressure generating device is a multi-function braking hydraulic pressure generating device.
청구항 1에 있어서, 상기 전동부스터는 상기 ECU를 통해 제어되고 구동되는 모터와, 커넥터에 결합되어 상기 모터의 회전을 상기 마스터실린더를 가압하는 직선이동으로 전환시켜주는 진퇴이동기로 구성되어진 것을 특징으로 하는 다기능 제동유압발생장치.
The motor booster according to claim 1, wherein the electric booster comprises a motor controlled and driven by the ECU, and a forward / backward movement unit coupled to the connector for switching the rotation of the motor to linear movement for pressing the master cylinder Multifunctional braking hydraulic pressure generator.
청구항 1에 있어서, 상기 마스터실린더는 상기 전동부스터를 통해 전진이동되어 유압을 형성하고, 형성된 유압을 제1·2배출구로 배출시켜주는 피스톤이동체를 갖춘 것을 특징으로 하는 다기능 제동유압발생장치.
The multifunctional braking hydraulic pressure generator as set forth in claim 1, wherein the master cylinder has a piston moving body that moves forward through the electric booster to form a hydraulic pressure and to discharge the formed hydraulic pressure to the first and second outlets.
삭제delete 청구항 1에 있어서, 상기 피스톤은 상기 페달에 연결되어진 입력로드로 상기 페달의 움직임을 추종하는 것을 특징으로 하는 다기능 제동유압발생장치.
The multifunctional braking hydraulic pressure generator according to claim 1, wherein the piston follows the movement of the pedal with an input rod connected to the pedal.
삭제delete 청구항 1에 있어서, 상기 반력형성부재는 직선이동되는 가압로드에 지지되고 상기 피스톤에 의해 밀려나는 가압력을 받는 탄성체와, 상기 탄성체를 탄발지지하는 리턴스프링으로 구성되어진 것을 특징으로 하는 다기능 제동유압발생장치.
2. The multifunctional braking hydraulic pressure generator as set forth in claim 1, wherein said reaction force generating member is composed of an elastic body supported by a linearly moving pressure rod and subjected to a pressing force pushed by said piston, and a return spring elastically supporting said elastic body .
KR1020100107232A 2010-10-29 2010-10-29 Multi Function Breaking Pressure Generating Device KR101660047B1 (en)

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