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KR100741279B1 - Shock absorber oil seal - Google Patents

Shock absorber oil seal Download PDF

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Publication number
KR100741279B1
KR100741279B1 KR1020030008075A KR20030008075A KR100741279B1 KR 100741279 B1 KR100741279 B1 KR 100741279B1 KR 1020030008075 A KR1020030008075 A KR 1020030008075A KR 20030008075 A KR20030008075 A KR 20030008075A KR 100741279 B1 KR100741279 B1 KR 100741279B1
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KR
South Korea
Prior art keywords
oil seal
piston rod
main lip
shock absorber
oil
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Application number
KR1020030008075A
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Korean (ko)
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KR20040072126A (en
Inventor
김남호
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주식회사 만도
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Priority to KR1020030008075A priority Critical patent/KR100741279B1/en
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Publication of KR100741279B1 publication Critical patent/KR100741279B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/36—Special sealings, including sealings or guides for piston-rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2230/00—Purpose; Design features
    • F16F2230/30—Sealing arrangements

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

본 발명은 쇽 업소버의 오일씰에 관한 것이다. The present invention relates to an oil seal of a shock absorber.

본 발명의 오일 씰은, 중심축이 중공으로 형성되는 원판상의 고무재 몸체가 설치되고; 상기 몸체의 내부에 변형을 방지하는 보강와셔가 설치되고; 상기 몸체의 내측 상단으로 피스톤 로드와 밀착되어 내부로의 이물질 유입을 방지하는 더스트립이 압착링으로 압착 설치되고; 상기 몸체의 내측 하단에는 상기 피스톤 로드와 밀착되는 메인립이 슬립하게 설치되고; 상기 메인립과 몸체의 하면 사이에서 메인립을 지지하는 다각 형상의 보조씰이 설치되는; 구성임을 특징으로 한다. 따라서 오일 씰의 몸체 하부에 메인립을 지지하는 별도의 보조씰을 설치함으로써, 과다한 오일의 압력 작용에도 오일 씰의 변형을 최소화하여 씰링의 성능을 안정적으로 유지하는 효과가 있다.The oil seal of the present invention is provided with a disc-shaped rubber material body in which the central axis is formed hollow; A reinforcement washer is installed inside the body to prevent deformation; A dust strip which is in close contact with the piston rod to the inner upper end of the body and prevents foreign substances from entering into the inside is compressed by a pressing ring; A main lip in close contact with the piston rod is slip-installed at an inner lower end of the body; An auxiliary seal having a polygonal shape supporting the main lip between the main lip and the lower surface of the body is installed; Characterized in that the configuration. Therefore, by installing a separate auxiliary seal for supporting the main lip in the lower body of the oil seal, there is an effect of maintaining the performance of the sealing stably by minimizing the deformation of the oil seal even under excessive pressure of the oil.

Description

쇽 업소버의 오일씰{OIL SEAL USE IN A SHOCK ABSORBER}오일 OIL SEAL USE IN A SHOCK ABSORBER}

도 1은 종래의 쇽 업소버의 오일 씰을 도시한 단면도이고,1 is a cross-sectional view showing an oil seal of a conventional shock absorber,

도 2는 본 발명에 따른 쇽 업소버의 오일 씰을 도시한 단면도이다.2 is a cross-sectional view showing the oil seal of the shock absorber according to the present invention.

＜도면의 주요부분에 대한 부호의 설명＞<Description of the code | symbol about the principal part of drawing>

100 : 쇽업소버 110 : 내부관100: shock absorber 110: inner tube

120 : 외부관 130 : 피스톤 로드120: outer tube 130: piston rod

140 : 로드 가이드 150 : 오일씰140: rod guide 150: oil seal

151 : 몸체 152, 156 : 보강와셔151: body 152, 156: reinforcement washer

153 : 더스트립(dust lip) 153a : 압착링153: dust lip 153a: crimping ring

154 : 메인립(main lip) 155 : 보조씰154: main lip 155: auxiliary seal

157 : 체크립157: check lip

본 발명은 쇽 업소버의 오일 씰에 관한 것으로서, 더욱 상세하게는 과도한 내압이 작용하는 쇽 업소버의 작동에서 씰링 성능을 향상시킨 쇽 업소버의 오일 씰에 관한 것이다. The present invention relates to an oil seal of a shock absorber, and more particularly, to an oil seal of a shock absorber having improved sealing performance in operation of a shock absorber in which excessive internal pressure is applied.                         

일반적으로 쇽 업소버(shock absorber)는 차축과 차체 사이에 설치되어 차량의 주행시 차축이 노면으로부터 받는 진동이나 충격을 흡수하여 승차감을 향상시키는 방진, 완충장치로서, 그 내부는 감쇠력을 증대시킬 수 있도록 가스 및 오일 등의 충진물이 채워진다.In general, shock absorbers are installed between the axle and the body to absorb vibrations or shocks received by the axle from the road surface to improve ride comfort. The interior of the shock absorber is a gas so as to increase damping force. And fillers such as oil are filled.

도 1은 종래 쇽 업소버의 오일 씰을 도시한 단면도이다. 도시된 바와 같이, 쇽 업소버(1)는 오일이 가득 채워진 내부관(10)과, 내부관(10)의 외측으로 오일과 가스가 채워진 외부관(20)과, 일단은 내부관(10) 내측으로 삽입되고 타단은 외부관(20) 외측으로 연장된 피스톤 로드(30)가 마련된다.1 is a cross-sectional view showing an oil seal of a conventional shock absorber. As shown, the shock absorber 1 includes an inner tube 10 filled with oil, an outer tube 20 filled with oil and gas outside the inner tube 10, and one end of the inner tube 10. Inserted into the other end is provided with a piston rod 30 extending to the outside of the outer tube (20).

내부관(10)은 상단에 피스톤 로드(30)를 지지 안내하는 로드 가이드(40)가 결합되며, 외부관(20)에 삽입되어 있다. The inner tube 10 is coupled to the rod guide 40 for supporting the piston rod 30 to the upper end, and is inserted into the outer tube 20.

외부관(20)은 밀폐된 중공관으로서 외부 하측에는 미도시된 차축과 연결될 수 있도록 하부 브래킷(21)이 마련되어 있고, 피스톤 로드(30)가 외부로 연장될 수 있도록 상단면의 중심축은 개구되어 있으며, 피스톤 로드(30)를 지지 안내하는 로드 가이드(40)가 상단 내측에 결합되고, 로드 가이드(40)의 상단에 오일 누설을 방지할 수 있도록 오일 씰(50)과, 그 상단에 씌워져 결합되는 캡(60)이 설치된다.The outer tube 20 is a closed hollow tube, which is provided with a lower bracket 21 at the outer lower side so as to be connected to an axle not shown, and the central axis of the upper surface is opened so that the piston rod 30 can extend to the outside. The rod guide 40 supporting the piston rod 30 is coupled to the inner side of the upper end, and the upper end of the rod guide 40 is coupled to the upper end of the oil seal 50 so as to prevent oil leakage. Cap 60 is installed.

로드 가이드(40)는 중심부에 피스톤 로드(30)를 안내하는 안내부시(43)가 설치되며, 안내부시(43)의 상부에는 오일씰(50)이 안착되는 가이드홈(42)이 형성된다. 가이드홈(42)에는 오리피스(orifice;41)가 형성되어 누설된 오일이나 가스를 오리피스(41)를 통해 외부관(20)으로 흐르도록 한다.The rod guide 40 has a guide bush 43 for guiding the piston rod 30 at the center thereof, and a guide groove 42 for seating the oil seal 50 is formed at the upper portion of the guide bush 43. An orifice 41 is formed in the guide groove 42 to allow the leaked oil or gas to flow through the orifice 41 to the outer tube 20.

오일 씰(50)은 외주면이 외부관(20)의 내주면에 밀착됨과 아울러 내주면이 피스톤 로드(30)의 외주면과 밀착되어 내부관(10)과 외부관(20)으로부터 오일 및 가스의 누설을 방지하는 것이다. 오일 씰(50)은 중심축에 중공(51)이 형성된 원판형상으로 이루어지며, 내부에는 피스톤 로드(30)의 이동으로 인해 전달되는 하중으로 변형되는 것을 방지하는 금속재질의 보강와셔(52)가 설치된다. 그리고 하부면에는 로드 가이드(40)에 형성된 가이드홈(42)에 밀착되는 체크 립(check lip; 56)이 형성된다.The oil seal 50 has an outer circumferential surface in close contact with the inner circumferential surface of the outer tube 20 and an inner circumferential surface in close contact with the outer circumferential surface of the piston rod 30 to prevent leakage of oil and gas from the inner tube 10 and the outer tube 20. It is. The oil seal 50 is formed in a disc shape in which a hollow 51 is formed in a central axis, and a reinforcing washer 52 of metal material is prevented from being deformed by a load transmitted due to the movement of the piston rod 30. Is installed. And a check lip (56) in close contact with the guide groove 42 formed in the rod guide 40 is formed on the lower surface.

또한, 중공(51)의 상.하측으로부터 연장되어 형성되는 상측단과 하측단이 피스톤 로드(30)와 밀착됨과 아울러 상측단과 하측단 사이의 중공(51)의 중간부분이 피스톤 로드(30)와 일정 간격으로 이격되는 메인립(53a)과 더스트립(53b)이 형성되며, 메인립(53a)과 더스트립(53b)의 외주면에는 피스톤 로드(30)측으로 압착하는 금속 재질의 압착링(54)이 상하로 각각 설치된다.In addition, the upper end and the lower end formed extending from the upper and lower sides of the hollow 51 are in close contact with the piston rod 30, and the middle portion of the hollow 51 between the upper end and the lower end is constant with the piston rod 30. The main lip 53a and the dust strip 53b spaced apart from each other are formed, and a metal pressing ring 54 pressed against the piston rod 30 side is formed on the outer circumferential surfaces of the main lip 53a and the dust strip 53b. It is installed up and down respectively.

상기 오일 씰(50)은 상, 하측으로 습동하는 피스톤 로드(30)와 접촉하여 씰링 성능을 유지한다. The oil seal 50 is in contact with the piston rod 30 which slides up and down to maintain sealing performance.

그러나 쇽 업소버의 내부 압력과 피스톤 로드의 습동 운동에 따라 메인립의 접촉 면적 형상 변형으로 기밀성이 저하되는 문제점이 있었다.However, there is a problem in that the airtightness is deteriorated by deformation of the contact area of the main lip according to the internal pressure of the shock absorber and the sliding motion of the piston rod.

본 발명은 상술한 바와 같은 종래의 문제점을 해결하기 위한 것으로서, 오일 씰의 몸체 하부에서 메인립을 지지하는 별도의 보조씰을 설치함으로써, 과다한 오일의 압력 작용에도 오일 씰의 변형을 최소화 한 쇽 업소버의 오일 씰을 제공하는데 그 목적이 있다. The present invention is to solve the conventional problems as described above, by installing a separate auxiliary seal for supporting the main lip in the lower part of the body of the oil seal, shock absorber that minimizes the deformation of the oil seal even under excessive pressure of oil The purpose is to provide an oil seal.                         

상기의 목적을 달성하기 위하여 본 발명은, 로드가이드의 하면에 위치하고, 피스톤 로드의 외주면과 밀착되어 오일 및 가스의 누설을 방지하는 쇽 업소버의 오일 씰에 있어서, 상기 오일 씰은, 중심축이 중공으로 형성되는 원판상의 고무재 몸체가 설치되고; 상기 몸체의 내부에 변형을 방지하는 보강와셔가 설치되고; 상기 몸체의 내측 상단으로 피스톤 로드와 밀착되어 내부로의 이물질 유입을 방지하는 더스트립이 압착링으로 압착 설치되고; 상기 몸체의 내측 하단에는 상기 피스톤 로드와 밀착되는 메인립이 슬립하게 설치되고; 상기 메인립과 몸체의 하면 사이에서 메인립을 지지하는 다각 형상의 보조씰이 설치되는; 구성임을 특징으로 하는 쇽 업소버의 오일 씰을 제공한다.In order to achieve the above object, the present invention, in the oil seal of the shock absorber which is located on the lower surface of the rod guide, in close contact with the outer peripheral surface of the piston rod to prevent the leakage of oil and gas, the oil seal, the central axis is hollow A disk-like rubber material body is formed; A reinforcement washer is installed inside the body to prevent deformation; A dust strip which is in close contact with the piston rod to the inner upper end of the body and prevents foreign substances from entering into the inside is compressed by a pressing ring; A main lip in close contact with the piston rod is slip-installed at an inner lower end of the body; An auxiliary seal having a polygonal shape supporting the main lip between the main lip and the lower surface of the body is installed; It provides an oil seal of shock absorber characterized by the configuration.

이하 첨부된 도면을 참조하여 본 발명에 따른 바람직한 실시 예를 상세하게 설명한다. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명에 따른 쇽 업소버의 오일 씰을 도시한 단면도이다.2 is a cross-sectional view showing the oil seal of the shock absorber according to the present invention.

본 발명에 따른 쇽업소버(100)의 오일 씰(150)의 외주면이 외부관(120)의 내주면에 밀착됨과 아울러 내주면이 피스톤 로드(130)의 외주면과 밀착되어 내부관(110)과 외부관(120)으로부터 오일 및 가스의 누설을 방지하기 위한 것으로서, 도 2에 도시되어 있는 바와 같다. The outer circumferential surface of the oil seal 150 of the shock absorber 100 according to the present invention is in close contact with the inner circumferential surface of the outer tube 120, and the inner circumferential surface is in close contact with the outer circumferential surface of the piston rod 130 so that the inner tube 110 and the outer tube ( It is to prevent the leakage of oil and gas from 120, as shown in FIG.

오일 씰(150)의 몸체(151)는 외부가 고무재질로 형성되며, 몸체(151)의 내부에는 피스톤 로드(130)의 이동으로 인해 전달되는 하중으로 인해 오일 씰(150)이 변형되는 것을 방지하기 위하여 금속재질인 원판의 보강와셔(152)가 설치된다. The body 151 of the oil seal 150 is formed of a rubber material on the outside thereof, and prevents the oil seal 150 from being deformed due to the load transmitted due to the movement of the piston rod 130 inside the body 151. In order to reinforce the washer of the disk is made of metal 152 is installed.                     

그리고 몸체(151)의 내측으로 연장 형성된 상단에 더스트립(153)이 형성된다. 더스트립(153)은 피스톤 로드(130)와 밀착되도록 압착링(153a)으로 압착 설치되어 내부로의 이물질 유입을 방지하게 된다.And the dust strip 153 is formed on the upper end formed inwardly of the body 151. The strip 153 is installed by pressing the compression ring 153a to be in close contact with the piston rod 130 to prevent the inflow of foreign matter into the interior.

그리고 몸체(151)의 내측 하단에는 피스톤 로드(130)와 밀착되는 메인립(154)이 더스트립(153)에 비하여 슬립(slip)한 형태로 형성된다.The main lip 154 in close contact with the piston rod 130 is formed on the inner lower end of the body 151 in a slip form compared to the strip 153.

한 편, 몸체(151)의 하면과 메인립(154)의 사이에, 하방의 과도한 압력으로부터 메인립(154)을 지지하는 별도의 보조씰(155)이 설치된다. 보조씰(155)은 몸체(151)의 하면 공간 형상과 같은 다각형인 사다리꼴로 형성된다. 그리고 보조씰(155) 내부에 변형 방지를 위한 금속재의 보강와셔(156)가 설치되고, 하면에는 로드가이드(140)에 밀착되는 체크립(157)이 하방으로 형성된다.On the other hand, between the lower surface of the body 151 and the main lip 154, a separate auxiliary seal 155 for supporting the main lip 154 from excessive pressure from below is installed. The auxiliary seal 155 is formed in a trapezoid having a polygonal shape such as a space shape of the lower surface of the body 151. In addition, a reinforcing washer 156 of a metal material for preventing deformation is installed in the auxiliary seal 155, and a check lip 157 in close contact with the rod guide 140 is formed downward.

그리고 로드가이드(140)는 오일 씰(150)의 보조씰(155) 설치에 따라 전장 길이가 보조씰(155) 길이 정도 줄어들게 된다.In addition, the rod guide 140 is reduced in length by about the length of the auxiliary seal 155 according to the installation of the auxiliary seal 155 of the oil seal 150.

이와 같이 구성된 본 발명에 따른 쇽 업소버의 오일 씰의 작용을 설명하면 다음과 같다.Referring to the operation of the oil seal of the shock absorber according to the present invention configured as described above are as follows.

다시 도 2를 참조하면, 먼저, 피스톤로드(130)의 상, 하측 이동시 오일의 유동저항으로 인해 차체의 진동이나 충격을 흡수시켜 차량의 승차감을 향상시킬 수 있도록 되어 있다. Referring back to FIG. 2, first, the piston rod 130 may improve the riding comfort of the vehicle by absorbing vibrations or shocks of the vehicle body due to the flow resistance of the oil when the piston rod 130 moves up and down.

이 때, 본 발명의 오일씰(150)은 몸체(151)의 내측 상단에 형성된 더스트립(153)으로 하여 피스톤로드(130)로의 이물질 유입이 방지되며, 몸체(151)의 내측 하단 메인립(154)과 몸체(151)의 하면 사이에 설치된 별도의 보조씰(155)은 보강와셔(156)로 변형이 방지된 상태에서 오일의 과도한 압력으로부터 메인립(154)을 보호하여 메인립(154)의 변형을 방지한다.At this time, the oil seal 150 of the present invention is the dust strip 153 formed on the inner upper end of the body 151 to prevent foreign substances from entering the piston rod 130, the inner lower main lip 154 of the body 151 ) And a separate auxiliary seal 155 installed between the lower surface of the body 151 protects the main lip 154 from excessive pressure of oil in a state where deformation is prevented by the reinforcing washer 156 of the main lip 154. Prevent deformation.

따라서 오일씰(150)의 손상으로 인한 오일누설을 방지할 수 있다. Therefore, it is possible to prevent the oil leakage due to damage of the oil seal 150.

이상에서는 본 발명을 특정의 바람직한 실시 예에 대하여 도시하고 또한 설명하였으나, 본 발명은 상술한 실시 예에 한정되지 아니하며, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자라면 이하 청구범위에 기재된 본 발명의 요지를 벗어남이 없이 다양한 변경실시가 가능할 것이다.Although the present invention has been illustrated and described with respect to certain preferred embodiments, the present invention is not limited to the above-described embodiments, and a person skilled in the art to which the present invention pertains has the present invention set forth in the claims below. Various modifications may be made without departing from the spirit of the invention.

이상에서 설명한 바와 같이 본 발명의 쇽 업소버의 오일 씰은, 오일 씰의 몸체 하부에 메인립을 지지하는 별도의 보조씰을 설치함으로써, 과다한 오일의 압력 작용에도 오일 씰의 변형을 최소화하여 씰링의 성능을 안정적으로 유지하는 효과가 있다.
As described above, the oil seal of the shock absorber of the present invention is provided with a separate auxiliary seal supporting the main lip in the lower part of the body of the oil seal, thereby minimizing the deformation of the oil seal even under excessive pressure of the oil seal. It is effective to keep it stable.

Claims (2)

로드가이드의 하면에 위치하고, 피스톤 로드의 외주면과 밀착되어 오일 및 가스의 누설을 방지하는 쇽 업소버의 오일 씰에 있어서,In the oil seal of the shock absorber, which is located on the lower surface of the rod guide and is in close contact with the outer circumferential surface of the piston rod to prevent leakage of oil and gas, 상기 오일 씰은,The oil seal, 중심축이 중공으로 형성되는 원판상의 고무재 몸체가 설치되고;A disk-shaped rubber material body in which the central axis is formed hollow; 상기 몸체의 내부에 변형을 방지하는 보강와셔가 설치되고;A reinforcement washer is installed inside the body to prevent deformation; 상기 몸체의 내측 상단으로 피스톤 로드와 밀착되어 내부로의 이물질 유입을 방지하는 더스트립이 압착링으로 압착 설치되고;A dust strip which is in close contact with the piston rod to the inner upper end of the body and prevents foreign substances from entering into the inside is compressed by a pressing ring; 상기 몸체의 내측 하단에는 상기 피스톤 로드와 밀착되는 메인립이 슬립하게 설치되고;A main lip in close contact with the piston rod is slip-installed at an inner lower end of the body; 상기 메인립과 몸체의 하면 사이에서 메인립을 지지하는 다각 형상의 보조씰이 설치되는; 구성임을 특징으로 하는 쇽 업소버의 오일 씰.An auxiliary seal having a polygonal shape supporting the main lip between the main lip and the lower surface of the body is installed; Oil seal of shock absorber characterized by the configuration. 제 1 항에 있어서,The method of claim 1, 상기 보조씰은, 내부에 변형 방지를 위한 보강와셔가 설치되고, 하면에는 상기 로드가이드에 밀착되는 체크립이 형성되는 것을 특징으로 하는 쇽 업소버의 오일 씰.The auxiliary seal, the oil seal of the shock absorber, characterized in that the reinforcement washer is installed in the inside to prevent deformation, the lower surface is formed with a check lip in close contact with the rod guide.
KR1020030008075A 2003-02-10 2003-02-10 Shock absorber oil seal KR100741279B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190060590A (en) 2017-11-24 2019-06-03 평화오일씰공업주식회사 Sliding oil seal
KR20190124441A (en) 2018-04-26 2019-11-05 평화오일씰공업주식회사 Shock absorber oil seal
KR20210090057A (en) 2020-01-09 2021-07-19 평화오일씰공업주식회사 Shock absorber oil seal

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000016741U (en) * 1999-02-06 2000-09-25 밍 루 Hydraulic shock absorber for vehicles
JP2000304082A (en) 1999-04-22 2000-10-31 Showa Corp Hydraulic pressure buffer
JP2001050329A (en) 1999-08-06 2001-02-23 Toyoda Gosei Co Ltd Cap for shock absorber

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000016741U (en) * 1999-02-06 2000-09-25 밍 루 Hydraulic shock absorber for vehicles
JP2000304082A (en) 1999-04-22 2000-10-31 Showa Corp Hydraulic pressure buffer
JP2001050329A (en) 1999-08-06 2001-02-23 Toyoda Gosei Co Ltd Cap for shock absorber

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190060590A (en) 2017-11-24 2019-06-03 평화오일씰공업주식회사 Sliding oil seal
KR20190124441A (en) 2018-04-26 2019-11-05 평화오일씰공업주식회사 Shock absorber oil seal
KR20210090057A (en) 2020-01-09 2021-07-19 평화오일씰공업주식회사 Shock absorber oil seal

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