KR20000055852A - Variable reverse damping valve of suspension for car - Google Patents

Variable reverse damping valve of suspension for car Download PDF

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Publication number
KR20000055852A
KR20000055852A KR1019990004708A KR19990004708A KR20000055852A KR 20000055852 A KR20000055852 A KR 20000055852A KR 1019990004708 A KR1019990004708 A KR 1019990004708A KR 19990004708 A KR19990004708 A KR 19990004708A KR 20000055852 A KR20000055852 A KR 20000055852A
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KR
South Korea
Prior art keywords
damping force
damping
soft
valve
spool
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KR1019990004708A
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Korean (ko)
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윤영환
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밍 루
주식회사 만도
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Priority to KR1019990004708A priority Critical patent/KR20000055852A/en
Publication of KR20000055852A publication Critical patent/KR20000055852A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
    • B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
    • B60G17/056—Regulating distributors or valves for hydropneumatic systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
    • B60G17/018—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by the use of a specific signal treatment or control method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/10—Damping action or damper
    • B60G2500/11—Damping valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2600/00—Indexing codes relating to particular elements, systems or processes used on suspension systems or suspension control systems
    • B60G2600/22—Magnetic elements
    • B60G2600/26—Electromagnets; Solenoids

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

PURPOSE: A continuous variable reverse type damping valve of vehicle suspension system is provided to gently response to a variation of a vehicle body, so that the ride comport of a vehicle and the safety of operation can be improved. CONSTITUTION: A continuous variable reverse type damping valve of vehicle suspension system, which controls a damping force in relation to a movement of a vehicle body and a relative movement between a vehicle wheel and a vehicle body, the damping valve comprises a pilot valve member(20), a spool(40) for controlling an open degree of an orifice(30), a damping orifice(41) mounted in the spool(40) to prevent a damping force of the spool(40) from being unstable and to control an ejection pressure by a magnitude of a fixed orifice of a hall disc, and a proportional solenoid valve(50). The damping valve has a soft-hard region in which a damping force of a rebound chamber(60) is soft, whereas a damping force of a compression chamber(70) is hard by a continuous variable control for the damping force; a soft-soft region in which both of a damping force of a rebound chamber(60) and a damping force of a compression chamber(70) are soft, and a soft-hard region in which a damping force of a rebound chamber(60) is hard, whereas a damping force of a compression chamber(70) is soft; and a variable region in which a damping force is controlled in response to a movement of a vehicle.

Description

차량 현가시스템의 연속가변 리버스형 감쇠밸브{VARIABLE REVERSE DAMPING VALVE OF SUSPENSION FOR CAR}Continuously variable reverse damping valve for vehicle suspension system {VARIABLE REVERSE DAMPING VALVE OF SUSPENSION FOR CAR}

본 발명은 차량 현가시스템의 감쇠밸브에 관한 것으로, 감쇠력의 연속적인 제어를 가능하게 함으로써 인장 행정시에는 큰 감쇠력을 내고 압축 행정시에는 작은 감쇠력을 내거나, 인장 행정시에는 작은 감쇠력을 내고 압축 행정시에는 큰 감쇠력을 낼 수 있게 한 연속가변 리버스형 감쇠밸브에 관한 것이다.The present invention relates to a damping valve of a vehicle suspension system, which enables continuous control of the damping force, thereby providing a large damping force in the tension stroke and a small damping force in the compression stroke, or a small damping force in the tension stroke. The present invention relates to a continuously variable reverse damping valve capable of producing a large damping force.

일반적으로, 현가계의 감쇠력은 차체와 차륜의 상대운동에 관련하여 감쇠력을 적절히 제어하여야 한다. 하지만, 차륜의 운동은 10Hz 이상의 빠른 응답이 요구되므로, 감쇠기 내부의 기계적인 밸브 메커니즘에 의해 차체와 차륜의 상대운동에 따른 신속한 감쇠력 절환을 가능하게 하고 감쇠기의 압축(Compression)과 인장(Rebound) 행정시에 감쇠력 특성을 별도로 제어할 수 있는 밸브 개발이 추진되고 있다.In general, the damping force of the suspension system must properly control the damping force in relation to the relative motion of the vehicle body and the wheels. However, since the wheel movement requires a fast response of 10 Hz or more, the mechanical valve mechanism inside the attenuator enables rapid damping force change according to the relative movement of the body and the wheel, and the compression and rebound stroke of the attenuator. The development of a valve that can separately control the damping force characteristics in the city is being pushed forward.

이를 위한 현가시스템은 아래와 같은 기대 성능을 만족시켜야 한다.Suspension system for this purpose must satisfy expected performance as below.

첫째, 차량의 주행중 노면으로부터 전달되는 불규칙한 진동을 효율적으로 차단하여 양호한 승차감을 제공하고, 둘째, 운전자의 운전행위와 노면의 굴곡에 의해 발생되는 차체의 흔들림을 적절하게 제어하여 조종안정성을 양호하게 하며, 셋째, 불규칙한 노면 주행시 타이어의 접지면에서의 수직하중을 적절한 수준으로 유지하여 노면과의 점착력을 획득함으로써 선회, 제동, 구동시 차량의 안정성을 확보할 수 있어야 한다.First, it effectively blocks irregular vibrations transmitted from the road while the vehicle is running, providing a good ride comfort. Second, it properly controls the shaking of the vehicle caused by driver's driving behavior and the road curvature to improve steering stability. Third, the vehicle should be able to secure stability during turning, braking, and driving by acquiring adhesive force with the road surface by maintaining the vertical load on the ground plane of the tire at an appropriate level during irregular road driving.

기존의 현가시스템의 감쇠력 연속가변 댐퍼(Damper)는 감쇠력 가변 상태에 따라 노말(Normal)형 연속가변 댐퍼와 리버스(Reverse)형 연속가변 댐퍼로 나뉘어지고 있다. 노말형 연속가변 댐퍼는 인장 행정시나 압축 행정시 모두 큰 감쇠력을 발생하거나 또는 모두 작은 감쇠력을 발생하며, 리버스형 연속가변 댐퍼는 인장 행정시에는 작은 감쇠력을 내고 압축 행정시에는 큰 감쇠력을 내거나 또는 인장 행정시에는 큰 감쇠력을 내고 압축 행정시에는 작은 감쇠력을 내게 된다.The damping force continuous variable damper of the existing suspension system is divided into a normal continuous variable damper and a reverse continuous variable damper according to the variable damping force. The normal continuous variable damper generates a large damping force in both the tension stroke and the compression stroke, or generates a small damping force. The reverse continuous variable damper produces a small damping force in the tension stroke and a large damping force in the compression stroke. The stroke produces a large damping force and the compression stroke produces a small damping force.

종래의 댐퍼는 대부분 노말형 댐퍼로서, 일반적인 스텝모터 타입의 연속가변 댐퍼의 경우 피스톤 내부의 가변 오리피스를 기계적 스위칭에 의해 제어함으로써 시스템 반응 속도가 느리다는 단점이 있다. 또한, 인장 행정시의 감쇠력은 큰 폭으로 가변 가능한 반면, 압축 행정시 감쇠력의 가변 폭은 제한을 갖는 문제점을 안고 있다.Conventional dampers are mostly normal type dampers. In the case of a general stepper type continuous variable damper, the system response speed is slow by controlling the variable orifice inside the piston by mechanical switching. In addition, while the damping force in the tension stroke can be largely variable, the variable width of the damping force in the compression stroke has a problem of limitation.

본 발명은 상술한 바와 같은 종래의 문제점을 해소하기 위한 것으로, 본 발명은 스풀의 개도 제어와 밸브의 구조개선을 통해 각 챔버를 통과하는 오일의 연속적인 가변제어를 가능하게 함으로써 차륜과의 상대운동에 따른 차체의 변화에 자연스럽게 대응할 수 있는 연속가변 리버스형 감쇠밸브를 제공하는 것이다.The present invention is to solve the conventional problems as described above, the present invention is to allow the continuous variable control of the oil passing through each chamber through the control of the opening degree of the spool and the improvement of the valve structure relative to the wheel It is to provide a continuously variable reverse type damping valve that can naturally respond to changes in the vehicle body.

상술한 목적을 달성하기 위한 본 발명은, 차체의 운동 및 차륜과 차체의 상대운동에 관련하여 감쇠력을 제어하는 감쇠밸브에 있어서, 파일럿 밸브부와, 오리피스의 개도 제어를 위한 스풀 및 스풀내에 설치되어 스풀의 감쇠력 불안정을 방지하고 홀디스크의 고정 오리피스 크기에 의해 분출압력(Blow off)을 제어할 수 있게 하는 댐핑오리피스와, 비례솔레노이드를 포함하는 것을 특징으로 한다.The present invention for achieving the above object is a damping valve for controlling the damping force in relation to the movement of the vehicle body and the relative movement of the wheel and the vehicle body, the pilot valve portion, the spool for controlling the opening degree of the orifice is provided in the spool A damping orifice for preventing the spool damping force instability and controlling blow off by the fixed orifice size of the hole disk, and a proportional solenoid.

이와 같은 본 발명에 의하면, 리바운드 챔버의 감쇠력은 소프트(Soft)하고 컴프레션 챔버의 감쇠력은 하드(Hard)한 소프트-하드(Soft-Hard) 구간과, 리바운드 챔버의 감쇠력과 컴프레션 챔버의 감쇠력이 모두 소프트(Soft)한 소프트-소프트(Soft-Soft) 구간과, 리바운드 챔버의 감쇠력은 하드(Hard)하고 컴프레션 챔버의 감쇠력이 소프트(Soft)한 소프트-하드(Soft-Hard) 구간을 가질 수 있게 되며, 각 구간 사이에는 차량 거동에 따라 감쇠력을 제어하는 가변구간을 갖게 된다.According to the present invention, the soft damping force of the rebound chamber and the soft damping force of the compression chamber are hard, and the damping force of the rebound chamber and the damping force of the compression chamber are both soft. Soft-Soft section, and the damping force of the rebound chamber is hard, and the damping force of the compression chamber is soft, Soft-Hard section, Each section has a variable section for controlling the damping force according to the vehicle behavior.

도 1은 본 발명에 따른 연속가변 리버스형 감쇠밸브의 인장 행정시의 작동 단면도,1 is a cross-sectional view of the operation of the continuous variable reverse type damping valve in the tension stroke according to the present invention;

도 2는 본 발명에 따른 연속가변 리버스형 감쇠밸브의 압축 행정시의 작동 단면도,2 is a cross-sectional view of the operation of the continuously variable reverse type damping valve in the compression stroke according to the present invention;

도 3은 본 발명에 따른 감쇠밸브의 감쇠력선도,3 is a damping force diagram of the damping valve according to the present invention,

도 4, 도 5는 고정 오리피스의 직경 변화에 따른 압력 대 유량 특성을 도시한 선도.4 and 5 are diagrams showing pressure versus flow characteristics according to the change in diameter of the fixed orifice.

〈도면의 주요부분에 대한 부호의 설명〉<Explanation of symbols for main parts of drawing>

10; 감쇠밸브 20; 파일럿밸브(Pilot valve)10; Damping valve 20; Pilot valve

30; 오리피스(Orifice) 31; 홀디스크(Hole disk)30; Orifice 31; Hole disk

40; 스풀(Spool) 41; 댐핑오리피스(Damping orifice)40; Spool 41; Damping Orifice

50; 비례솔레노이드밸브 60; 리바운드 챔버(Rebound chamber)50; Proportional solenoid valve 60; Rebound chamber

70; 콤프레션 챔버(Compression chamber)70; Compression chamber

80; 베이스 챔버(Base chamber)80; Base chamber

이와 같은 본 발명의 특징적인 구성 및 이에 따른 작용효과는 첨부된 도면을 참조한 실시예의 상세한 설명을 통해 더욱 명확해 질 것이다.Such a characteristic configuration of the present invention and its effects will be more apparent through the detailed description of the embodiments with reference to the accompanying drawings.

도 1과 도 2에 나타낸 바와 같이, 본 발명의 연속가변 리버스형 감쇠밸브(10)는 파일럿 밸브부(20)와, 오리피스(30)의 개도 제어를 위한 스풀(40) 및 스풀(40)내에 설치되어 분출압력을 제어할 수 있게 하는 댐핑오리피스(41), 그리고 비례솔레노이드(50)를 포함하여 구성된다.As shown in FIG. 1 and FIG. 2, the continuously variable reverse damping valve 10 of the present invention includes a pilot valve portion 20 and a spool 40 and a spool 40 for controlling the opening degree of the orifice 30. A damping orifice 41 and a proportional solenoid 50 are installed to control the ejection pressure.

감쇠밸브(10)는 리바운드 감쇠밸브(a)와 컴프레션 감쇠밸브(b)가 직렬로 조립된다. 이에 따라, 리바운드 행정시에는 오일이 리바운드 챔버(60)에서 리바운드 감쇠밸브(a)를 거쳐 컴프레션 챔버로 흐르게 되고, 컴프레션 행정시에는 오일이 컴프레션 챔버(70)에서 컴프레션 감쇠밸브(b)를 거쳐 베이스 챔버(80)로 흐르게 된다.In the damping valve 10, a rebound damping valve a and a compression damping valve b are assembled in series. Accordingly, during the rebound stroke, oil flows from the rebound chamber 60 through the rebound damping valve a to the compression chamber, and during the compression stroke, the oil passes from the compression chamber 70 through the compression damping valve b to the base. It flows into the chamber 80.

여기서, 스풀(40)은 스프링과 직렬로 연결된 직동형 밸브로 구성되므로 스풀(40)내에 댐핑오리피스(41)를 준비하여 고주파 작동시 스풀(40)의 자력진동에 의한 감쇠력의 불안정성을 방지하고 있다.Here, since the spool 40 is composed of a linear valve connected in series with the spring, the damping orifice 41 is prepared in the spool 40 to prevent instability of the damping force due to magnetic vibration of the spool 40 during high frequency operation. .

따라서, 본 발명에 의한 연속가변 리버스형 감쇠밸브는 도 3에서와 같이, 리바운드 챔버(60)의 감쇠력은 소프트(Soft)하고 컴프레션 챔버(70)의 감쇠력은 하드(Hard)한 소프트-하드(Soft-Hard) 구간과, 리바운드 챔버(60)의 감쇠력과 컴프레션 챔버(70)의 감쇠력이 모두 소프트(Soft)한 소프트-소프트(Soft-Soft) 구간과, 리바운드 챔버(60)의 감쇠력은 하드(Hard)하고 컴프레션 챔버(70)의 감쇠력이 소프트(Soft)한 소프트-하드(Soft-Hard) 구간을 가질 수 있게 되는 것이다. 이때, 각 구간 사이는 차량 거동에 따라 감쇠력을 연속가변 제어하는 가변구간이 된다.Accordingly, in the continuous variable reverse type damping valve according to the present invention, as shown in FIG. 3, the damping force of the rebound chamber 60 is soft and the damping force of the compression chamber 70 is hard. -Hard section, soft-soft section in which the damping force of the rebound chamber 60 and the damping force of the compression chamber 70 are all soft, and the damping force of the rebound chamber 60 is hard. ), The damping force of the compression chamber 70 may have a soft-hard section. At this time, between each section is a variable section for continuously variable control the damping force according to the vehicle behavior.

도 4는 홀디스크(31)의 고정 오리피스가 ø1.4 일 때, 감쇠밸브(10)의 스풀(40) 변위를 변화시키며 시험한 감쇠력 특성 시험 결과이다. 시험 결과 고정 오리피스가 크게 설계되어 분출압력 기울기가 완만한 것을 알 수 있다.4 is a damping force characteristic test result of changing the displacement of the spool 40 of the damping valve 10 when the fixed orifice of the hole disk 31 is ø1.4. The test results show that the fixed orifice is largely designed and the ejection pressure gradient is gentle.

도 5는 위와 같은 시험 결과에 따라 고정 오리피스를 ø1.2로 하여 분출압력이 높아지도록 한 것으로, 시험 결과 도 4에 비해 분출압력 기울기가 상승함을 알 수 있다. 따라서, 분출압력은 고정 오리피스에 의해 튜닝이 가능한 것을 알 수 있다.FIG. 5 shows that the ejection pressure is increased by setting the fixed orifice to ø1.2 according to the above test result, and it can be seen that the ejection pressure inclination is increased compared to FIG. 4. Therefore, it can be seen that the ejection pressure can be tuned by the fixed orifice.

이와 같이, 본 발명은 감쇠력 조절기구를 댐퍼의 외부에 구성함으로써 감쇠력을 연속적으로 제어할 수 있게 되고, 인장 행정시에는 큰 감쇠력을 내고 압축 행정시에는 작은 감쇠력을 내거나 또는 인장 행정시에는 작은 감쇠력을 내고 압축 행정시 큰 감쇠력을 냄으로써 차체의 거동에 따라 감쇠력을 적절히 제어할 수 있는 연속가변 리버스형 댐퍼를 구현할 수 있게 된다.As described above, the present invention enables the damping force to be continuously controlled by constructing the damping force adjusting mechanism outside the damper, and provides a large damping force in the tension stroke and a small damping force in the compression stroke or a small damping force in the tension stroke. By providing a large damping force during the compression stroke, it is possible to implement a continuously variable reverse damper that can control the damping force appropriately according to the behavior of the vehicle body.

따라서, 피스톤 내부의 가변 오리피스를 기계적 스위칭에 의해 제어함으로써 시스템 반응 속도가 느릴 뿐 아니라, 인장 행정시의 감쇠력은 큰 폭으로 가변 가능한 반면 압축 행정시의 가변 폭은 제한을 갖는 종래 가변 댐퍼의 성능한계를 극복할 수 있게 된다.Therefore, by controlling the variable orifice inside the piston by mechanical switching, not only the system reaction speed is slow, but also the damping force in the tension stroke can be largely variable while the variable width in the compression stroke is limited. To overcome.

이상에서 설명한 바와 같이, 본 발명에 의한 연속가변 리버스형 감쇠밸브는 감쇠력의 연속적인 가변제어에 의해 리바운드 챔버의 감쇠력은 소프트(Soft)하고 컴프레션 챔버의 감쇠력은 하드(Hard)한 소프트-하드(Soft-Hard) 구간과, 리바운드 챔버의 감쇠력과 컴프레션 챔버의 감쇠력이 모두 소프트(Soft)한 소프트-소프트(Soft-Soft) 구간과, 리바운드 챔버의 감쇠력은 하드(Hard)하고 컴프레션 챔버의 감쇠력이 소프트(Soft)한 소프트-하드(Soft-Hard) 구간과, 차량 거동에 따라 감쇠력을 제어하는 가변구간을 가짐으로써, 차체 변화에 자연스럽게 대응하여 차량의 승차감과 조종 안정성을 향상시킬 수 있는 효과를 제공한다.As described above, the continuously variable reverse type damping valve according to the present invention has a soft soft damping force of the rebound chamber and a hard damping force of the compression chamber by continuous variable control of the damping force. -Hard section, soft-soft section in which both the damping force of the rebound chamber and the damping force of the compression chamber are soft, and the damping force of the rebound chamber is hard and the damping force of the compression chamber is soft ( By having a soft soft-hard section and a variable section that controls the damping force according to the vehicle behavior, it provides the effect of naturally improving the ride comfort and steering stability of the vehicle in response to the change in the body.

Claims (2)

차체의 운동 및 차륜과 차체의 상대운동에 관련하여 감쇠력을 제어하는 감쇠밸브에 있어서,In the damping valve for controlling the damping force in relation to the movement of the vehicle body and the relative movement of the wheel and the vehicle body, 상기 감쇠밸브(10)는 파일럿 밸브부(20)와, 오리피스(30)의 개도 제어를 위한 스풀(40) 및 상기 스풀(40)내에 설치되어 스풀(40)의 감쇠력 불안정을 방지하고 홀디스크(31)의 고정 오리피스 크기에 의해 분출압력을 제어할 수 있게 하는 댐핑오리피스(41)와, 비례솔레노이드(50)를 포함하는 것을 특징으로 하는 차량 현가시스템의 연속가변 리버스형 감쇠밸브.The damping valve 10 is installed in the pilot valve portion 20, the spool 40 for controlling the opening degree of the orifice 30, and the spool 40 to prevent the instability of the spool 40 and prevent the instability of the spool 40 31. A continuously variable reverse damping valve for a vehicle suspension system, comprising: a damping orifice 41 and a proportional solenoid 50 for controlling the ejection pressure by means of a fixed orifice size. 제 1 항에 있어서, 상기 감쇠밸브(10)는 리바운드 챔버(60)의 감쇠력은 소프트(Soft)하고 컴프레션 챔버(70)의 감쇠력은 하드(Hard)한 소프트-하드(Soft-Hard) 구간과, 리바운드 챔버(60)의 감쇠력과 컴프레션 챔버(70)의 감쇠력이 모두 소프트(Soft)한 소프트-소프트(Soft-Soft) 구간과, 리바운드 챔버(60)의 감쇠력은 하드(Hard)하고 컴프레션 챔버(70)의 감쇠력이 소프트(Soft)한 소프트-하드(Soft-Hard) 구간과, 차체 변화에 따라 감쇠력을 제어하는 가변구간을 가지는 것을 특징으로 하는 차량 현가시스템의 연속가변 리버스형 감쇠밸브.The damping valve 10 of claim 1, wherein the damping force of the rebound chamber 60 is soft and the damping force of the compression chamber 70 is hard. Soft-Soft section in which both the damping force of the rebound chamber 60 and the damping force of the compression chamber 70 are soft, and the damping force of the rebound chamber 60 is hard and the compression chamber 70 is reduced. A soft-hard section having a soft damping force of a) and a variable section for controlling the damping force according to the change of the vehicle body, the continuous variable reverse damping valve of the vehicle suspension system.
KR1019990004708A 1999-02-10 1999-02-10 Variable reverse damping valve of suspension for car KR20000055852A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR970002057A (en) * 1995-06-29 1997-01-24 Pressure control valve
KR970062391A (en) * 1996-01-25 1997-09-12 이시다 고조 Hydraulic shock absorber
JPH1073141A (en) * 1995-12-20 1998-03-17 Tokico Ltd Damping force adjustable hydraulic shock absorber
KR0144659B1 (en) * 1992-11-20 1998-08-01 이시다 아쯔미 Damping force control type hydraulic shock absorber
JPH10259843A (en) * 1997-03-18 1998-09-29 Tokico Ltd Damping force-adjusted hydraulic shock absorber

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR0144659B1 (en) * 1992-11-20 1998-08-01 이시다 아쯔미 Damping force control type hydraulic shock absorber
KR970002057A (en) * 1995-06-29 1997-01-24 Pressure control valve
JPH1073141A (en) * 1995-12-20 1998-03-17 Tokico Ltd Damping force adjustable hydraulic shock absorber
KR970062391A (en) * 1996-01-25 1997-09-12 이시다 고조 Hydraulic shock absorber
JPH10259843A (en) * 1997-03-18 1998-09-29 Tokico Ltd Damping force-adjusted hydraulic shock absorber

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