KR20040042168A - Suspension having variable strut device - Google Patents
Suspension having variable strut device Download PDFInfo
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- KR20040042168A KR20040042168A KR1020020070335A KR20020070335A KR20040042168A KR 20040042168 A KR20040042168 A KR 20040042168A KR 1020020070335 A KR1020020070335 A KR 1020020070335A KR 20020070335 A KR20020070335 A KR 20020070335A KR 20040042168 A KR20040042168 A KR 20040042168A
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- strut
- spring
- vehicle
- suspension
- variable
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Classifications
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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
- B60G17/015—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
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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
- B60G17/015—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
- B60G17/0152—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 action on a particular type of suspension unit
- B60G17/0157—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 action on a particular type of suspension unit non-fluid unit, e.g. electric motor
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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
- B60G17/015—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
- B60G17/0182—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 involving parameter estimation, e.g. observer, Kalman filter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2401/00—Indexing codes relating to the type of sensors based on the principle of their operation
- B60G2401/20—Switches, e.g. mercury or ball type switches
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
Description
본 발명은 가변 스트러트 장치를 갖춘 차량의 현가장치에 관한 것으로, 보다 상세하게는 스프링의 동 변수(Kinetic variable)를 튜닝(tuning)해 항상 최적의 승차감을 얻을 수 있도록 된 가변 스트러트 장치를 갖춘 차량의 현가장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension of a vehicle having a variable strut device. More particularly, the present invention relates to a suspension of a vehicle having a variable strut device in which a kinetic variable of a spring is tuned to always obtain an optimum ride comfort. It is about a suspension device.
일반적으로 차량의 현가장치는 차축과 차체를 연결하여 주행중에 차축이 노면으로부터 받는 진동이나 충격을 차체에 직접적으로 전달되지 않도록 제어하여 차체와 화물의 손상을 방지하고 승차감을 좋게 만드는 장치로, 통상 자동차의 장착부위에 따라 앞 현가장치와 뒤 현가장치로 구분되어진다.In general, the suspension of the vehicle is a device that connects the axle and the body to prevent the axle from being transmitted directly from the road surface while driving the vehicle to prevent damage to the body and cargo and improves ride comfort. It is divided into front suspension and rear suspension according to the mounting part of.
이중 앞 현가장치는 프레임과 차축 사이를 연결하여 차량의 중량을 지지하면서 바퀴의 진동을 흡수하는데, 이는 또한 앞차축의 형식에 따라 차축현가식과 독립현가식으로 구분되면서 승용차에 사용되는 독립현가식과 버스나 트럭 등에 사용되는 차축 현가식으로 구분되어진다.The double front suspension system connects the frame and the axle to support the weight of the vehicle and absorbs the vibration of the wheels.It is also divided into the axle suspension type and the independent suspension type according to the type of the front axle. It is divided into axle suspension type used for trucks.
여기서, 상기 독립현가식은 여러 타입으로 분류되는데 그 중 한 예로서, 스트러트식(맥퍼어슨형) 현가장치는 도 1에 도시된 바와 같이 차륜(W)과 차체사이에 연결되면서 스프링시트(3)에 양쪽이 고정된 코일 스프링(4)에 의해 감싸여진 쇽업소버(5)로 이루어진 스트러트(1)가 구비되되, 이 스트러트(1)는 그 상부(1')가 인슐레이터(도시되지 않음)를 매개로 차체에 회전 가능하게 체결되는 반면, 그하부(1")는 로어아암(2)이 연결되어 있는 너클에 브라켓을 매개로 고정되게 장착되어진다.Here, the independent suspension type is classified into several types, for example, the strut type (Macperson type) suspension is connected to the wheel (W) and the body as shown in Figure 1 to the spring seat (3) There is provided a strut (1) consisting of a shock absorber (5) wrapped by a coil spring (4) fixed at both sides, the strut (1) having its top (1 ') via an insulator (not shown). While being rotatably fastened to the vehicle body, the lower part 1 "is fixedly mounted to the knuckle to which the lower arm 2 is connected via a bracket.
여기서 상기 코일 스프링(4)은 일정한 직경과 이에 따른 동 스프링 상수가 일정한 값을 갖게 됨은 물론이다.Here, the coil spring 4 has a constant diameter and consequently the same spring constant has a constant value.
이에 따라 차량의 주행중에 불규칙한 노면으로 인해 차륜을 통해 진동과 충격이 스트러트(1)부위로 전달되면, 상기 스트러트(1)를 구성하는 쇽업소버(5)와 스프링(4)의 적절한 신축운동으로 진동 및 충격을 흡수해서 저감시켜 가능한 한 차체로 전달되지 않게 차단하여 현가장치의 역할을 수행하게 된다.Accordingly, when vibrations and shocks are transmitted to the struts 1 through the wheels due to the irregular road surface while the vehicle is running, the vibrations are caused by the proper stretching and movement of the shock absorbers 5 and the springs 4 constituting the struts 1. And it absorbs and reduces the shock to block the delivery to the vehicle body as possible to serve as a suspension device.
그러나, 이와 같은 스트러트식 현가장치를 이루는 스프링(4)은 그 특성인 동 스프링 상수값이 정해져 고정되어 있고 이로 인해, 상기 스프링(4)을 통한 충격 완화·흡수성능이 고정 즉, 차량의 탑승객이나 짐이 많거나 적은 데에 관계없이 항상 일정하게 작용되어 최적의 승차감을 발휘하지 못하는 단점이 있게 된다.However, the spring 4 constituting such a strut type suspension device is fixed by fixing a constant spring constant value thereof, and thus the shock absorbing and absorbing performance through the spring 4 is fixed, that is, the passengers of the vehicle Regardless of whether there is a lot or a lot of luggage, there is a disadvantage in that it does not always work optimally.
이에 본 발명은 상기와 같은 점을 감안하여 발명된 것으로, 차량의 탑승객이나 짐이 많거나 적은 데에 따라 스프링의 성능 특성을 비례하도록 변화시켜 항상 최적의 승차감을 발휘할 수 있는 현가장치를 제공함에 그 목적이 있다.Accordingly, the present invention has been invented in view of the above, and provides a suspension device capable of always exhibiting an optimum riding comfort by changing the performance characteristics of the spring proportionally according to the number of passengers or the load of the vehicle. There is a purpose.
상기와 같은 목적을 달성하기 위한 본 발명은, 현가장치의 스트러트가 인슐레이터를 매개로 차체에 체결되는 스트러트 상부와 차륜에 결합된 너클부위로 브라켓을 매개로 장착되는 스트러트 하부를 이루는 쇽업소버와, 이 쇽업소버의 외주면을 감싸면서 완충작용을 하는 코일 스프링 및 스트러트 상부부위에서 스프링을 감싸 수용하면서 차량의 하중에 따라 스프링의 동 변수를 변화시키는 가변수단으로 이루어지되, 상기 가변수단은 액튜에이터를 매개로 이동되도록 서로 슬라이딩 결합된 지지케이스로 이루어진 상·하부조절부재와, 상기 액튜에이터를 각각 작동시키도록 운전석에 구비된 조작스위치로 이루어진 것을 특징으로 한다.The present invention for achieving the above object, the shock absorber forming the strut of the suspension is mounted to the upper strut fastened to the vehicle body via the insulator and the lower strut mounted through the bracket to the knuckle portion coupled to the wheel, and The shock absorbing coil wraps around the outer circumferential surface of the shock absorber and the spring is wrapped in the upper part of the strut while the variable means for changing the dynamic parameters of the spring in accordance with the load of the vehicle, the variable means is moved through the actuator It characterized in that the upper and lower adjustment member consisting of a support case slidingly coupled to each other, and an operation switch provided in the driver's seat to operate the actuator, respectively.
도 1은 종래에 따른 스트러트 타입의 차량용 현가장치의 구성도1 is a block diagram of a strut type vehicle suspension according to the prior art
도 2는 본 발명에 따른 가변 스트러트 장치를 갖춘 차량의 현가장치의 구성도2 is a configuration diagram of a suspension device for a vehicle having a variable strut device according to the present invention.
도 3은 본 발명에 따른 현가장치의 스트러트 상부부위 변화 상태도Figure 3 is a state change state of the upper strut of the suspension according to the invention
도 4는 본 발명에 따른 현가장치의 스트러트 하부부위 변화 상태도Figure 4 is a state diagram of changing the lower strut portion of the suspension according to the present invention
<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>
1 : 스트러트1' : 상부1: Strut 1 ': Upper part
1" : 하부2 : 로어아암1 ": Lower 2: Lower Arm
3 : 스프링시트4 : 스프링3: spring seat 4: spring
5 : 쇽업소버5: Shock absorber
10 : 가변수단11 : 상부조절부재10: variable means 11: upper adjusting member
11a,12a : 지지케이스11b,12b : 액튜에이터11a, 12a: support case 11b, 12b: actuator
12 : 하부조절부재13 : ECU12: lower control member 13: ECU
14 : 조작스위치14: operation switch
이하 본 발명의 실시예를 첨부된 예시도면을 참조로 상세히 설명한다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 2는 본 발명에 따른 가변 스트러트 장치를 갖춘 차량의 현가장치의 구성도를 도시한 것인바, 본 발명은 현가장치의 스트러트(1)가 인슐레이터를 매개로 차체에 체결되는 상부(1')와 차륜에 결합된 너클부위로 브라켓을 매개로 장착되는 하부(1")를 이루면서 코일 스프링(4)에 의해 감 싸여진 쇽업소버(5)로 이루어지되, 상기 쇽업소버(5)가 차체에 고정된 스트러트(1)의 상부(1')부위에서 스프링(4)을 감싸 수용하면서 스프링(4)의 완충작용을 강제적으로 제한해 가해지는 하중에 따라 스프링(4)의 동 변수를 변화시키는 가변수단(10)이 구비되어진다.Figure 2 shows a block diagram of a suspension device of a vehicle having a variable strut device according to the present invention, the present invention is the upper portion (1 ') that the strut (1) of the suspension device is fastened to the vehicle body via an insulator The shock absorber (5) is formed of a shock absorber (5) wrapped by a coil spring (4) while forming a lower portion (1 ") that is mounted through a bracket to a knuckle portion coupled to a wheel, and the shock absorber (5) is fixed to a vehicle body. Variable means (10) for changing the dynamic parameters of the spring (4) in accordance with the load applied by forcibly limiting the buffering action of the spring (4) while wrapping and receiving the spring (4) in the upper portion (1 ') of (1) ) Is provided.
여기서, 상기 가변수단(10)은 쇽업소버(5)가 고정된 차체부위에 밀착된 지지케이스(11a)를 액튜에이터(11b)로 강제적으로 가압해 스프링(4)과의 접촉 상태를 분리하는 상부조절부재(11)와, 이 상부조절부재(11)에 결합되면서 지지케이스(12a)를 액튜에이터(12b)로 강제적으로 가압해 스프링(4)의 일정영역을 압축시키는 하부조절부재(12), 운전석에 구비된 조작스위치(14)의 조작에 따라상·하부조절부재(11,12)의 액튜에이터(11b,12b)에 전기 신호를 보내 선택적으로 작동시키는 ECU(13)로 이루어진다.Here, the variable means 10 is the upper control for forcing the support case (11a) in close contact with the body portion fixed to the shock absorber (5) by the actuator (11b) to separate the contact state with the spring (4) To the lower adjustment member 12 and the driver's seat, which are coupled to the member 11 and the upper adjustment member 11 and forcibly presses the support case 12a with the actuator 12b to compress a predetermined region of the spring 4. It consists of an ECU 13 which selectively sends an electric signal to the actuators 11b and 12b of the upper and lower adjustment members 11 and 12 according to the operation of the provided operation switch 14.
이때, 상기 상·하부조절부재(11,12)는 서로 슬라이딩(Sliding)결합 즉, 상기 상부조절부재(11)내부로 하부조절부재(12)가 삽입되어진다.At this time, the upper and lower control members (11, 12) is sliding (ie, sliding) with each other, that is, the lower control member 12 is inserted into the upper control member (11).
한편, 상기 조작스위치(14)는 로타리타입의 스위치로서 그 회전방향에 따라 상·하부조절부재(11,12)의 액튜에이터(11b,12b)에 각각 전기신호를 보내게 됨은 물론이다.On the other hand, the operation switch 14 is a rotary type switch of the electric signal to the actuator (11b, 12b) of the upper and lower control members (11, 12), of course, according to the rotational direction of course.
또한, 상기 상·하부조절부재(11,12)는 ECU(13)를 통하지 않고 즉, 상기 조작스위치(14)가 상·하부조절부재(11,12)의 액튜에이터(11b,12b)에 직접 연결되어 전원을 공급할 수 있게 될 수 도 있음은 물론이다.In addition, the upper and lower adjusting members 11 and 12 are not connected to the actuator 13, that is, the operation switch 14 is directly connected to the actuators 11b and 12b of the upper and lower adjusting members 11 and 12. Of course, it may be possible to supply power.
이하 본 발명의 작동을 첨부된 도면을 참조로 상세히 설명한다.Hereinafter, the operation of the present invention will be described in detail with reference to the accompanying drawings.
본 발명은 운전자의 판단에 따라 운전석에 위치된 조작스위치(14)를온(On)시켜 상부조절부재(11)를 통해 스프링(4)의 동 변수 특성을 가변시키게 되는데 즉, 도 3에 도시된 바와 같이 조작스위치(14)의 신호를 받는 ECU(13)에 의해 작동되는 상부조절부재(11)의 액튜에이터(11b)를 통해 차체를 약간 들어올려 쇽업소버(5)를 감싼 스프링(4)의 일단이 차체부위로부터 해방되어 스프링(4)의 동 변수 특성이 변하게 된다.The present invention is to change the dynamic variable characteristics of the spring (4) through the upper adjustment member 11 by turning on the operation switch 14 located in the driver's seat according to the driver's judgment, that is, as shown in FIG. One end of the spring 4 which slightly lifts the vehicle body and wraps the shock absorber 5 through the actuator 11b of the upper adjustment member 11 operated by the ECU 13 receiving the signal of the operation switch 14 as described above. It is released from the vehicle body part and the dynamic variable characteristic of the spring 4 is changed.
즉, 상기 상부조절부재(11)의 액튜에이터(11b)가 작동되면 지지케이스(11a)를 차체쪽으로 가압하게 되고, 이와 같이 상기 액튜에이터(11b)에 의해 차체쪽으로힘을 받는 지지케이스(11a)가 스프링(4)과의 접촉 상태를 해제해 즉, 상기 지지케이스(11a)가 더 이상 스프링(4)의 상부부위를 구속하지 않아 스프링(4)을 통한 전달력을 차단시켜 다른 완충 성능을 구현하게 된다.That is, when the actuator 11b of the upper adjustment member 11 is operated, the support case 11a is pressed toward the vehicle body, and thus the support case 11a, which is urged toward the vehicle body by the actuator 11b, is a spring. The contact state with (4) is released, that is, the support case (11a) no longer restrains the upper portion of the spring (4) to cut off the transmission force through the spring (4) to implement different cushioning performance .
이때, 상기 상부조절부재(11)의 지지케이스(11a)는 하부조절부재(12)의 지지케이스(12a)로부터 액튜에이터(11b)에 의한 이동량 만큼 슬라이딩되면서 위쪽으로 이동되어짐은 물론이다.At this time, the support case (11a) of the upper adjustment member 11 is moved upward by sliding the amount of movement by the actuator (11b) from the support case (12a) of the lower adjustment member (12).
또한, 본 발명의 가변수단(10)의 하부조절부재(12)를 통해 스프링(4)의 동 변수 특성을 가변시키는 경우에는, 도 4에 도시된 바와 같이 조작스위치(14)의 신호를 받는 ECU(13)에 의해 작동되는 하부조절부재(12)의 액튜에이터(12b)가 쇽업소버(5)를 감싼 스프링(4)의 하부부위를 가압해 동 변수 특성을 변화시키게 된다.In addition, in the case of varying the dynamic variable characteristics of the spring 4 through the lower control member 12 of the variable means 10 of the present invention, as shown in Figure 4 ECU receiving the signal of the operation switch 14 The actuator 12b of the lower adjustment member 12 actuated by (13) presses the lower portion of the spring 4 surrounding the shock absorber 5 to change the dynamic variable characteristics.
즉, 상기 하부조절부재(12)의 액튜에이터(12b)가 작동되면 지지케이스(12a)를 차체와 반대 방향인 아래쪽으로 밀어주게 되고, 이에 따라 상기 지지케이스(12a)를 기준으로 스프링(4)의 상부부위에 비해 그 하부부위가 간격이 상대적으로 좁게 되면서 결국, 상기 지지케이스(12a)를 기준으로 스프링(4)의 상부부위와 하부부위의 동 특성이 서로 다르게 되어 스프링(4)을 통한 전달력을 이중으로 형성해 또 다른 완충 성능을 구현하게 된다.That is, when the actuator 12b of the lower adjustment member 12 is operated, the support case 12a is pushed downward in a direction opposite to the vehicle body, and accordingly, the spring 4 of the spring 4 is based on the support case 12a. As the lower portion of the lower portion is relatively narrower than the upper portion, the dynamic characteristics of the upper portion and the lower portion of the spring 4 are different from each other based on the support case 12a, and thus the transmission force through the spring 4 is different. It is doubled to realize another buffering performance.
이때, 상기 하부조절부재(12)의 지지케이스(12a)는 상부조절부재(11)의 지지케이스(11a)로부터 액튜에이터(12b)에 의한 이동량 만큼 슬라이딩되면서 아래쪽으로 이동되어짐은 물론이다.At this time, the support case 12a of the lower adjustment member 12 is moved downward from the support case 11a of the upper adjustment member 11 by the amount of movement by the actuator 12b.
한편, 조작스위치(14)가 오프(Off)된 즉. 가변수단(10)이 전혀 작동되지 않는 경우에는 도 2에 도시된 바와 같이, 차량의 주행시 완충작용을 하는 스프링(4)의 상·하 이동시 스프링(4)을 구속하지 않고 스프링(4)과 일체로 이동되면서 완충 성능을 구현하게 됨은 물론이다.On the other hand, that is, the operation switch 14 is Off. When the variable means 10 are not operated at all, as shown in FIG. 2, the spring 4 is integrated with the spring 4 without restraining the spring 4 during the up and down movement of the spring 4 which buffers the vehicle when the vehicle is driven. Of course, the performance of the buffer performance will be realized.
이상 설명한 바와 같이 본 발명에 의하면, 차체와 차륜에 각각 상·하부가 결합된 쇽업소버에 구비되어 완충기능을 하는 스프링의 일정부위를 감싸면서 스프링과 함께 움직이거나 스프링의 움직임과 구속상태를 변화시켜 스프링의 동 스프링 상수 값인 동 특성을 차량의 하중 상태에 따라 가변해 최적의 승차감을 발휘 할 수 있는 효과가 있게 된다.As described above, according to the present invention, the shock absorber is provided in the shock absorber coupled to the upper and lower parts of the vehicle body and the wheel, respectively. The dynamic characteristics, which is the constant value of the spring constant of the spring, are varied depending on the load condition of the vehicle, thereby providing the optimum ride comfort.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020020070335A KR20040042168A (en) | 2002-11-13 | 2002-11-13 | Suspension having variable strut device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020020070335A KR20040042168A (en) | 2002-11-13 | 2002-11-13 | Suspension having variable strut device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR20040042168A true KR20040042168A (en) | 2004-05-20 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020020070335A KR20040042168A (en) | 2002-11-13 | 2002-11-13 | Suspension having variable strut device |
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| Country | Link |
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| KR (1) | KR20040042168A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6094810A (en) * | 1983-10-31 | 1985-05-28 | Suzuki Motor Co Ltd | Vehicle posture control equipment |
| JPH08332822A (en) * | 1995-06-08 | 1996-12-17 | Isuzu Motors Ltd | Car height adjusting mechanism |
| KR970034277A (en) * | 1995-12-27 | 1997-07-22 | 정몽원 | 2-stage spring constant variable electronically controlled suspension |
| KR20010100498A (en) * | 2000-05-03 | 2001-11-14 | 김중원 | Suspension apparatus |
-
2002
- 2002-11-13 KR KR1020020070335A patent/KR20040042168A/en not_active Application Discontinuation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6094810A (en) * | 1983-10-31 | 1985-05-28 | Suzuki Motor Co Ltd | Vehicle posture control equipment |
| JPH08332822A (en) * | 1995-06-08 | 1996-12-17 | Isuzu Motors Ltd | Car height adjusting mechanism |
| KR970034277A (en) * | 1995-12-27 | 1997-07-22 | 정몽원 | 2-stage spring constant variable electronically controlled suspension |
| KR20010100498A (en) * | 2000-05-03 | 2001-11-14 | 김중원 | Suspension apparatus |
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