KR100291062B1 - operating cylinder structure for power steering system - Google Patents

operating cylinder structure for power steering system Download PDF

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Publication number
KR100291062B1
KR100291062B1 KR1019970076652A KR19970076652A KR100291062B1 KR 100291062 B1 KR100291062 B1 KR 100291062B1 KR 1019970076652 A KR1019970076652 A KR 1019970076652A KR 19970076652 A KR19970076652 A KR 19970076652A KR 100291062 B1 KR100291062 B1 KR 100291062B1
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South Korea
Prior art keywords
piston
steering
operating
cylinder
hydraulic oil
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KR1019970076652A
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Korean (ko)
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KR19990056646A (en
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권오성
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이계안
현대자동차주식회사
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Priority to KR1019970076652A priority Critical patent/KR100291062B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/065—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/10—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of power unit
    • B62D5/12—Piston and cylinder

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)

Abstract

PURPOSE: A structure of an operating cylinder of a power steering system is provided to prevent drop of stiffness of parts in a control valve and to improve steerage by making hydraulic oil drained through a communicating line. CONSTITUTION: A flow check piston(23), supported a rack bar(22) if virtual pressure is given by hydraulic oil in an operating cylinder(21), is installed within. The inner part of the operating cylinder is divided into a left and right pressure chamber(24,25) by the flow check piston. Hydraulic lines(26,27) communicating with control valve is installed each in the left and right pressure chambers. A stopper supported with a spring(29) is installed to the inside of the operating cylinder when the flow check piston is pressurized and pushed by the hydraulic oil to be flowed into the left and right pressure chambers during perfect steering. The hydraulic oil is directly drained into the opposite pressure chamber and pressure given the piston is reduced.

Description

동력조향장치의 작동실린더구조{operating cylinder structure for power steering system}Operating cylinder structure for power steering system

본 발명은 자동차의 동력조향장치에 관한 것으로, 특히 조향핸들의 완전 조타시 작동실린더내 랙바아에 장착된 피스톤으로 압력을 가하는 작동유가 연통관로를 통해 바로 드레인되게 함으로써, 컨트롤밸브내 관련부품들의 강성저하를 방지하면서 조타감을 향상시킬 수 있도록 된 동력조향장치의 작동실린더구조에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power steering apparatus of an automobile, and in particular, when the steering wheel is fully steered, the hydraulic oil pressurized by a piston mounted on a rack bar in a working cylinder is drained directly through a communication pipe, thereby stiffening the related parts in the control valve. The present invention relates to a working cylinder structure of a power steering device which is capable of improving steering feeling while preventing degradation.

일반적으로 자동차에는 주행중에 차체의 진행방향을 운전자의 임의대로 바꿀 수 있도록 된 조향장치를 구비하고 있는 바, 이러한 조향장치는 운전자가 차륜의 진행방향을 임의로 바꿀 수 있도록 장착되는 것으로서, 운전자가 직접 조향조작을 하여 그 조작력을 각 기구로 전달하기 위해 조향 휠과 조향 축 및 칼럼 등으로 이루어진 조작기구와, 조향축의 회전을 감속함으로써 조작력을 증대시킴과 동시에 조작기구의 운동방향을 바꾸어 링크 기구에 전달하는 기어기구 및, 기어기구의 움직임을 앞바퀴에 전달함과 동시에 좌우 바퀴의 관계위치를 올바르게 유지하기 위해 피트먼 암과 드래드 링크 및 너클 암과 타이로드 등으로 구성된 링크 기구를 갖추고 있다.In general, a vehicle is provided with a steering device that allows the driver to change the driving direction of the vehicle at any time during driving. The steering device is mounted to allow the driver to arbitrarily change the driving direction of the wheel. In order to transmit the operating force to each mechanism by operating the steering wheel, steering shaft, column, etc., the operating mechanism is increased by decelerating the rotation of the steering shaft, and the movement direction of the operating mechanism is changed and transmitted to the link mechanism. In order to transmit the gear mechanism and the movement of the gear mechanism to the front wheel and maintain the relation position of the left and right wheels correctly, a link mechanism composed of a pitman arm and a drag link, a knuckle arm and a tie rod is provided.

한편, 대형 자동차나 저압 타이어를 사용한 차량에서는 앞바퀴의 접지저항이 크기 때문에 핸들의 조작력이 크게 되고 신속한 조향 조작이 안될 염려가 있기 때문에 가볍고 신속한 조향조작을 하기 위해 동력조향장치를 사용하고 있는 바, 이와 같은 동력조향장치는 동력원이 되는 유압을 발생시키는 오일펌프와 압력 조절밸브 및 유량제어밸브를 포함하는 밸브 유닛 등으로 구성된 동력장치와, 오일펌프에서 발생한 유압을 기계적인 힘으로 바꾸어 조향력을 발생시키기 위해 실린더를 사용하는 작동장치 및, 이 작동장치에 이르는 유로를 개폐하고 핸들의 조작에 상응해서 유로를 바꾸어 동력실린더의 작동방향과 작동상태를 제어하는 제어장치 등으로 구성되어 있다.On the other hand, in the case of a large car or a vehicle using low pressure tires, since the grounding resistance of the front wheel is large, the steering force of the steering wheel becomes large and the quick steering operation is not possible. The same power steering device includes a power device composed of an oil pump for generating hydraulic pressure as a power source, a valve unit including a pressure control valve and a flow control valve, and a hydraulic power generated by the oil pump to generate a steering force. An operating device using a cylinder and a control device for opening and closing the flow path leading to the operation device and controlling the operation direction and operating state of the power cylinder by changing the flow path in accordance with the operation of the handle.

즉, 상기와 같은 일반적인 형태의 동력조향장치는 도 1에 도시된 바와 같이, 운전자에 조향조작을 위한 조향핸들(1)이 상측 선단부에 장착된 조향축(2)과, 이 조향축(2)을 외부에서 감싸고서 차체에 고정되는 조향컬럼(3), 상기 조향축(2)의 하부에 장착되어 조향시 작동유의 흐름을 제어하도록 된 컨트롤밸브(4) 및, 상기 조향축(2)의 하측 선단에 마련된 구동피니언부(도시안됨)와 치합되어 이의 회전 운동에 따라 직선운동을 하는 랙바아(도시안됨)를 갖춘 작동실린더(5), 그리고 엔진의 크랭크축과 벨트를 매개로 연결되어 이로부터 동력을 받아 작동되어 조향시 상기 컨트롤밸브(4)로 가압된 작동유를 공급하도록 된 오일펌프(6), 이 오일펌프 (6)로 작동유를 공급하도록 일정량의 작동유를 저장하고 있는 오일저장탱크(7)로 구성되어 이루어진다.That is, as shown in FIG. 1, the general type power steering apparatus includes a steering shaft 2 having a steering handle 1 mounted on an upper end portion of the driver for steering operation, and the steering shaft 2. A steering column (3) fixed to the vehicle body by wrapping it externally, a control valve (4) mounted on the lower part of the steering shaft (2) to control the flow of hydraulic fluid during steering, and a lower side of the steering shaft (2). An operating cylinder (5) having a rack bar (not shown) engaged with a drive pinion part (not shown) provided at the tip and performing a linear motion according to its rotational movement, and connected to the engine via a crankshaft and a belt. Oil pump (6) which is operated by the power supply to supply the pressurized hydraulic oil to the control valve (4) when steering, the oil storage tank (7) storing a certain amount of hydraulic oil to supply the hydraulic oil to the oil pump (6) It consists of).

또한, 상기 컨트롤밸브(4)와 오일펌프(6) 및 오일저장탱크(7) 사이에는 각기 작동유의 공급 및 회수를 위한 공급관로(8)와 회수관로(9)가 배설되어 있고, 상기 작동실린더(5)의 양선단부위에는 내부의 작동피스톤과 연결되어 외부로 노출되어 이의 타단이 각기 전륜측 너클에 연결되어 조향시 선회방향으로 너클을 밀어 회전시키도록 하는 타이로드(10)가 마련되어 있다.In addition, between the control valve (4), the oil pump (6) and the oil storage tank (7), a supply line (8) and a recovery line (9) for supplying and recovering hydraulic oil are respectively disposed. Tie rod 10 is provided at both end portions of (5) to be connected to the internal working piston and exposed to the outside so that the other end thereof is connected to the front wheel side knuckles to rotate the knuckle in the turning direction during steering.

따라서 조향시 상기 오일펌프(6)는 공급관로(8)를 통해 컨트롤밸브(4)로 가압된 작동유를 공급하게 되고, 이에 따라 컨트롤밸브(4)는 조향방향으로 조작력이 경감되도록 작동실린더(5)의 작동피스톤을 밀게 되며, 이 작동실린더 (5)의 이동으로 타이로드(10)가 너클을 회동시켜 조향이 용이하게 이루어지도록 한다.Therefore, when steering, the oil pump 6 supplies the hydraulic oil pressurized to the control valve 4 through the supply line 8, and thus the control valve 4 is operated to reduce the operating force in the steering direction (5) ), The operation piston is pushed, and the movement of the operation cylinder (5) causes the tie rod 10 to rotate the knuckle to facilitate steering.

그런데 상기와 같이 구성된 종래의 동력조향장치에서 완전 조타시 작동유가 컨트롤밸브를 거쳐 작동실린더내에 작용하는 상태는 도 2에 도시된 바와 같다.However, in the conventional power steering apparatus configured as described above, the state in which the working oil acts in the operation cylinder through the control valve during full steering is as shown in FIG. 2.

즉, 동력조향장치에서 조향시 상기 작동실린더(5)내에서 랙바아(11)에 의해 지지되어 작동유의 가압력을 받도록 된 작동피스톤(12)은, 완전 조타시 컨트롤밸브(4)로부터 작동실린더(5)의 좌/우측 압력실(13,14)내로 각기 연통되게 마련된 유압관로(15,16)를 통해 유입되는 작동유에 의해 스톱퍼(17)에까지 밀리게 되는데, 이와 같이 상기 작동피스톤(12)이 작동실린더(5)의 좌/우측 압력실(13,14)내에서 스톱퍼(17)에까지 밀릴 경우에도 유압관로(15,16)를 통한 작동유의 공급은 계속해서 진행되어지므로 조타감이 좋지 못할 뿐만 아니라, 상기 컨트롤밸브(4)내 관련부품들의 강성을 저하시키게 되는 단점이 있었다.That is, the operating piston 12, which is supported by the rack bar 11 in the operating cylinder 5 when being steered by the power steering device and is subjected to the pressing force of the hydraulic oil, is operated from the control valve 4 when fully steering. 5) is pushed to the stopper 17 by the hydraulic oil flowing through the hydraulic pipes 15 and 16 provided in communication with the left and right pressure chambers 13 and 14, respectively. Even when pushed to the stopper 17 in the left / right pressure chambers 13 and 14 of the operating cylinder 5, the supply of hydraulic oil through the hydraulic lines 15 and 16 continues to be performed, resulting in poor steering. Rather, there was a disadvantage in that the rigidity of the related parts in the control valve (4) is lowered.

이에 본 발명은 상기와 같은 단점을 해소하기 위해 안출된 것으로, 조향핸들의 완전 조타시 작동실린더내에서 랙바아에 장착된 피스톤에 압력을 가하는 작동유가 연통관로를 통해 반대편 압력실로 바로 드레인되어 피스톤에 가하는 압력을 경감시킴으로써, 컨트롤밸브내 관련부품들의 강성저하를 방지하면서 조타감을 향상시킬 수 있도록 된 동력조향장치의 작동실린더구조를 제공함에 그 목적이 있다.Accordingly, the present invention has been made to solve the above disadvantages, the hydraulic oil for applying pressure to the piston mounted on the rack bar in the operating cylinder of the steering wheel is fully drained to the opposite pressure chamber through the communication pipe to the piston It is an object of the present invention to provide a working cylinder structure of a power steering apparatus which can improve steering feeling by reducing the stiffness of related parts in a control valve by reducing the pressure applied.

도 1은 종래 자동차의 동력조향장치를 도시한 구성도,1 is a configuration diagram showing a power steering device of a conventional vehicle;

도 2는 종래 작동실린더의 내부구조를 개략적으로 도시한 단면도,2 is a cross-sectional view schematically showing the internal structure of a conventional working cylinder,

도 3과 도 4는 각각 본 발명에 따른 작동실린더의 작동전/후를 개략적으로 도시한 단면도,3 and 4 are cross-sectional views schematically showing before and after the operation of the operation cylinder according to the present invention, respectively;

도 5는 도 3과 도 4의 요부 확대사시도,5 is an enlarged perspective view illustrating main parts of FIGS. 3 and 4;

도 6은 도 3과 도 4의 요부 확대단면도이다.6 is an enlarged cross-sectional view illustrating main parts of FIGS. 3 and 4.

〈 도면의 주요 부분에 대한 부호의 설명 〉<Description of the code | symbol about the principal part of drawing>

21-작동실린더 22-랙바아21-operating cylinder 22-rack bar

23-작동피스톤 24,25-좌/우측 압력실23-operating piston 24,25-left / right pressure chamber

26,27-유압관로 28-스톱퍼26,27-Hydraulic Pipeline 28-Stopper

29-스프링 30-연통통로29-spring 30-communication path

상기한 바의 목적을 달성하기 위한 본 발명은, 작동실린더내에서 작동유에 의해 가압력을 받으면서 랙바아에 의해 지지되는 작동피스톤이 내장되고, 이 작동실린더의 내부는 작동피스톤에 의해 좌/우측 압력실로 구획지으며, 이 작동실린더의 좌/우측 압력실내로 상기 컨트롤밸브와 연통하는 유압관로가 각각 설치되는 한편, 상기 작동실린더의 내부에는 완전 조타시 좌/우측 압력실내로 유입되는 작동유에 의해 작동피스톤이 가압되어 밀릴 경우 이 작동피스톤에 의해 밀리도록 배면에 스프링을 매개로 탄발지지된 스톱퍼가 설치되어 이루어진다.The present invention for achieving the above object is a built-in operating piston which is supported by the rack bar while being pressed by the working oil in the working cylinder, the interior of the working cylinder to the left / right pressure chamber by the working piston A hydraulic passage communicating with the control valve is installed into the left and right pressure chambers of the working cylinder, respectively, while the working piston is introduced into the left and right pressure chambers by the hydraulic fluid flowing into the left and right pressure chambers during full steering. When pushed and pushed, a spring-loaded stopper is installed on the back so as to be pushed by this working piston.

이하 본 발명의 실시예를 첨부된 예시도면을 참조로 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 3과 도 4는 각각 본 발명에 따른 작동실린더의 작동전/후를 개략적으로 도시한 단면도이고, 도 5는 도 3과 도 4의 요부 확대사시도이며, 도 6은 도 3과 도 4의 요부 확대단면도이다.3 and 4 are cross-sectional views schematically showing before and after the operation of the operating cylinder according to the present invention, FIG. 5 is an enlarged perspective view of main parts of FIGS. 3 and 4, and FIG. 6 is a main part of FIGS. 3 and 4. It is an enlarged cross section.

본 발명은 도면에 도시된 바와 같이, 작동실린더(21)내에서 랙바아(22)에 의해 지지되어 작동유의 가압력을 받는 작동피스톤(23)이 내장되고, 이 작동실린더(21)의 내부는 작동피스톤(23)에 의해 좌/우측 압력실(24,25)로 구획지으며, 이 작동실린더(21)의 좌/우측 압력실(24,25)내로 상기 컨트롤밸브(도시안됨)로부터 연통되는 유압관로(26,27)가 각각 설치되는 한편, 상기 작동실린더(21)의 내부에는 완전 조타시 컨트롤밸브로부터 연통된 유압관로(26,27)를 통해 좌/우측 압력실(24,25)내로 유입되는 작동유에 의해 작동피스톤(23)이 가압되어 밀릴 경우 이 작동피스톤(23)에 의해 밀리도록 배면에 스프링(29)을 매개로 탄발지지된 스톱퍼(28)가 설치된다.According to the present invention, as shown in the drawing, an operating piston (23) supported by the rack bar (22) in the operating cylinder (21) and subjected to a pressing force of hydraulic oil is built in, and the inside of the operating cylinder (21) is operated. The hydraulic line is divided into the left and right pressure chambers 24 and 25 by the piston 23 and communicates with the control valve (not shown) into the left and right pressure chambers 24 and 25 of the operation cylinder 21. While 26 and 27 are respectively installed, the operation cylinder 21 flows into the left and right pressure chambers 24 and 25 through hydraulic lines 26 and 27 communicated from the control valve during full steering. When the working piston 23 is pushed and pushed by the hydraulic oil, a stopper 28 is supported on the back so as to be pushed by the working piston 23 via the spring 29.

또, 상기 작동실린더(21)에는 완전 조타시 유압관로(26,27)를 통해 공급되는 작동유에 의해 작동피스톤(23)이 상기 스톱퍼(28)를 밀게 될 경우 작동피스톤(23)이 가압하는 반대편 좌/우측 압력실(24,25)로 작동유를 드레인시켜 주는 연통통로(30)가 개방되도록 되어 있다.In addition, when the operating piston 23 pushes the stopper 28 by the hydraulic oil supplied through the hydraulic lines 26 and 27 at the time of complete steering, the operating cylinder 23 is pressed against the opposite side. The communication passage 30 for draining the hydraulic oil to the left and right pressure chambers 24 and 25 is opened.

이를 위해 상기 스톱퍼(28)는 작동피스톤(23)에 의해 완전히 밀리면, 연통통로(30)와 교통되는 개구부(28a)를 갖추고 있으며, 이 스톱퍼(28)는 상부에 끼움부(28b)를 갖추고 있어 작동실린더(21)의 내주면에 형성된 요홈(21a)내 끼워져 섭동가능하도록 되어 있다.To this end, the stopper 28 has an opening 28a which is in communication with the communication passage 30 when fully pushed by the operation piston 23, and the stopper 28 has a fitting portion 28b thereon. It is fitted in the groove 21a formed in the inner circumferential surface of the operation cylinder 21 to be perturbed.

따라서 조향시 완전 우회전의 조타가 일어나면, 상기 컨트롤밸브로부터 작동유가 유압관로(26)를 통해 좌측 압력실(24)로 유입되고, 이 좌측 압력실(24)로 유입된 작동유는 작동피스톤(23)을 밀어 우측의 스톱퍼(28)를 완전히 가압할 때까지 작용되며, 이에 따라 상기 스톱퍼(28)가 스프링(29)를 완전히 밀고서 우측으로 이동하게 되면, 스톱퍼(28)의 개구부(28a)가 상기 연통통로(30)와 교통되면서 작동피스톤(23)의 좌측부위를 가압하고 있던 좌측 압력실(24)내의 작동유는 연통통로(30)를 통해 작동피스톤(23)의 우측부위인 우측 압력실(25)내로 드레인되므로, 작동피스톤(23)에 작동유의 압력이 지속적으로 작용하지 않게 된다.Therefore, when steering of the right turn occurs during steering, the hydraulic oil flows from the control valve to the left pressure chamber 24 through the hydraulic line 26, and the hydraulic oil introduced into the left pressure chamber 24 is the operating piston (23). Until the stopper 28 on the right side is fully pressurized, and thus the stopper 28 pushes the spring 29 completely and moves to the right side, the opening 28a of the stopper 28 is moved to the right side. The hydraulic fluid in the left pressure chamber 24, which is in communication with the communication passage 30 and pressurizes the left portion of the operating piston 23, passes through the communication passage 30 to the right pressure chamber 25, which is the right portion of the operating piston 23. Since it is drained to the inside, the pressure of the working oil does not continuously act on the working piston (23).

이때, 상기 작동피스톤(23)의 우측부위인 우측 압력실(25)내로 드레인된 작동유는 작동피스톤(23)의 우측부위에 압력을 가할 수 있게 되므로, 상기 작동피스톤(23)이 이의 좌측부위에 작용하는 작동유의 압력에 의해 급격하게 완전 조타의 종료위치로 이동하지 않게 되므로, 완전 조타시 발생되는 충격을 완화시켜 줄 수 있게 된다.At this time, the hydraulic oil drained into the right pressure chamber 25, which is the right side of the working piston 23, can apply pressure to the right side of the working piston 23, so that the working piston 23 is placed on the left side thereof. Since the pressure of the working oil does not suddenly move to the end of the full steering, it is possible to mitigate the shock generated during the full steering.

한편, 완전 좌회전시에도 상기와 동일하게 우측 압력실(25)에 있던 작동유가 연통통로(30)를 통해 반대편 좌측 압력실(24)로 드레인되어 작동피스톤(23)에 작동유의 압력이 지속적으로 작용하지 않게 됨은 물론이다.On the other hand, the hydraulic fluid in the right pressure chamber 25 is drained to the left pressure chamber 24 on the opposite side through the communication passage 30 even when the motor is completely left, and the pressure of the hydraulic oil is continuously applied to the working piston 23. Of course not.

상기와 같이 작동실린더(21)의 내에서 완전 조타시 스톱퍼(28)쪽을 향해 작동유에 의해 작동피스톤(23)이 가압되어 밀리면, 상기 연통통로(30)와 스톱퍼(28)의 개구부(28a)가 교통되어 작동유를 반대편 압력실로 드레인시킬 수 있으므로, 컨트롤밸브내 관련부품들의 강성저하를 방지하면서 조타감을 향상시킬 수 있게 된다.As described above, when the operating piston 23 is pushed and pushed toward the stopper 28 by the operating oil in the operating cylinder 21, the opening 28a of the communication passage 30 and the stopper 28 is pushed. This allows the hydraulic fluid to be drained into the pressure chamber on the opposite side, thereby improving the steering feeling while preventing the degradation of the related components in the control valve.

이상 설명한 바와 같이 본 발명에 따른 동력조향장치의 작동실린더구조에 의하면, 동력조향장치에서 완전 조타시 작동실린더내의 작동피스톤을 작동유가 가압함에 따라 작동피스톤의 전후의 좌/우측 압력실 사이에서 작동유의 교통이 이루어지므로 작동피스톤에 가해지는 작동유의 가압력이 경감될 수 있게 되고, 이에 따라 관련부품들의 강성저하의 방지와 함께 조타감을 향상시킬 수 있는 효과가 있게 된다.As described above, according to the operating cylinder structure of the power steering apparatus according to the present invention, the hydraulic fluid is pressurized between the left and right pressure chambers before and after the operating piston as the hydraulic oil pressurizes the operating piston in the operating cylinder when the power steering is fully steered. Since the traffic is made, the pressing force of the hydraulic oil applied to the working piston can be reduced, thereby preventing the rigidity of the related parts and improving the steering feeling.

Claims (3)

(정정) 작동실린더(21)내에서 작동유에 의해 가압력을 받으면서 랙바아(22)에 의해 지지되도록 내장된 작동피스톤(23)과, 상기 작동실린더(21)의 내부에서 상기 작동피스톤(23)에 의해 구획되는 좌/우측 압력실(24,25) 및, 상기 작동실린더(21)의 좌/우측 압력실(24,25)내에서 컨트롤밸브와 연통하도록 설치된 유압관로(26,27)를 구비한 동력조향장치에 있어서,(Correction) An operating piston 23 built in the operating cylinder 21 to be supported by the rack bar 22 while being pressurized by the hydraulic oil, and in the operating cylinder 21 to the operating piston 23. And a hydraulic pipe line 26 or 27 installed to communicate with a control valve in the left and right pressure chambers 24 and 25 partitioned by the left and right pressure chambers 24 and 25 of the operation cylinder 21. In the power steering system, 상기 작동실린더(21)내 좌/우측 압력실(24,25)에는 조향장치의 완전 조타에 따른 상기 작동피스톤(23)의 이동시 좌/우측 압력실(24,25) 사이를 선택적으로 교통시키는 연통통로(30)가 설치되고, 이 연통통로(30)에는 상기 작동피스톤(23)에 의해 가압되어 좌/우측 압력실(24,25) 사이를 서로 교통되게 하도록 연통통로(30)와 연통되는 개구부(28a)를 갖춘 스톱퍼(28)가 설치되며, 이 스톱퍼(28)는 배면이 스프링(29)을 매개로 탄발지지된 것을 특징으로 하는 동력조향장치의 작동실린더구조.Communication between the left and right pressure chambers 24 and 25 in the actuating cylinder 21 selectively communicates between the left and right pressure chambers 24 and 25 when the actuating piston 23 moves according to the steering of the steering device. The passage 30 is provided, and the communication passage 30 is pressurized by the working piston 23 to communicate with the communication passage 30 to allow the left and right pressure chambers 24 and 25 to communicate with each other. A stopper (28) having a stopper (28a) is installed, the stopper (28) is an operation cylinder structure of the power steering apparatus, characterized in that the back side is supported by a spring through the 29. (삭제).(delete). (정정) 제 1 항에 있어서, 상기 스톱퍼(28)는 상부에 작동실린더(21)의 내주면의 요홈(21a)내 끼워져 이동가능하게 하는 끼움부(28b)를 갖춘 것을 특징으로 하는 동력조향장치의 작동실린더구조.(Correct) The power steering apparatus according to claim 1, characterized in that the stopper 28 has a fitting portion 28b that is fitted in the groove 21a of the inner circumferential surface of the operation cylinder 21 to be movable thereon. Working cylinder structure.
KR1019970076652A 1997-12-29 1997-12-29 operating cylinder structure for power steering system KR100291062B1 (en)

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Publication number Priority date Publication date Assignee Title
KR101382973B1 (en) * 2008-03-14 2014-04-08 기아자동차주식회사 Stopper Assembly for Steering Apparatus of Vehicle

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KR100457197B1 (en) * 2002-10-10 2004-11-16 기아자동차주식회사 Device for Adjusting Minimum Rotation Radius of a vehicle
KR100903336B1 (en) * 2007-12-13 2009-06-18 현대자동차주식회사 Steering gearbox

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KR960017279U (en) * 1994-11-30 1996-06-17 대우자동차 주식회사 Hydraulic cylinder of power steering device equipped with pressure relief hydraulic pipe

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
KR960017279U (en) * 1994-11-30 1996-06-17 대우자동차 주식회사 Hydraulic cylinder of power steering device equipped with pressure relief hydraulic pipe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101382973B1 (en) * 2008-03-14 2014-04-08 기아자동차주식회사 Stopper Assembly for Steering Apparatus of Vehicle

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