KR20010086962A - Apparatus for collecting oil leakage of hydraulic cylinder - Google Patents

Apparatus for collecting oil leakage of hydraulic cylinder Download PDF

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Publication number
KR20010086962A
KR20010086962A KR1020000010989A KR20000010989A KR20010086962A KR 20010086962 A KR20010086962 A KR 20010086962A KR 1020000010989 A KR1020000010989 A KR 1020000010989A KR 20000010989 A KR20000010989 A KR 20000010989A KR 20010086962 A KR20010086962 A KR 20010086962A
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KR
South Korea
Prior art keywords
oil
cylinder
hydraulic
drain port
hydraulic cylinder
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KR1020000010989A
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Korean (ko)
Inventor
서정용
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제재근
주식회사 금양
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Priority to KR1020000010989A priority Critical patent/KR20010086962A/en
Publication of KR20010086962A publication Critical patent/KR20010086962A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/005—Leakage; Spillage; Hose burst
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1457—Piston rods
    • F15B15/1461—Piston rod sealings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Actuator (AREA)

Abstract

PURPOSE: A leak oil recovery device of a hydraulic cylinder is provided to prevent a hydraulic cylinder from being contaminated, and to improve reliability of products with bypassing oil to an oil tank through a drain port without leaking. CONSTITUTION: A leak oil recovering apparatus is composed of a hydraulic cylinder(20) connecting to an oil tank and a hydraulic pump through a hydraulic line, and having an oil seal(40) between a cylinder housing(22) and a cylinder rod(36); a round recess(60) collecting oil through the oil seal; a drain port(62) extended in the recess to discharge oil; and a bypass line placed in the lower part of the drain port, and connected to the oil tank. The cylinder rod is reciprocated in the cylinder housing in supplying oil through a first port(32) or a second port(34) of the cylinder housing. Oil is collected to the recess through a first step seal of the oil seal by the reciprocating motion of the cylinder rod, and discharged through the drain port inclined in the lower part. The leak oil recovery apparatus prevents oil from being leaked through an opening part(26) of a first cover(28) by recovering oil to the oil tank through the bypass line.

Description

유압실린더의 누유 회수장치{APPARATUS FOR COLLECTING OIL LEAKAGE OF HYDRAULIC CYLINDER}Oil leakage recovery device of hydraulic cylinder {APPARATUS FOR COLLECTING OIL LEAKAGE OF HYDRAULIC CYLINDER}

본 발명은 유압실린더에 관한 것으로, 보다 상세하게는 실린더하우징으로부터 누설되는 오일을 오일탱크로 회수하기 위한 유압실린더의 누유 회수장치에 관한 것이다.The present invention relates to a hydraulic cylinder, and more particularly, to an oil leakage recovery apparatus for a hydraulic cylinder for recovering oil leaking from a cylinder housing to an oil tank.

일반적으로 유압실린더는 실린더하우징과, 실린더하우징의 보어 내부를 왕복운동하는 실린더로드를 구비하며, 오일탱크와 유압펌프, 방향전환밸브에 작동적으로 연결되어 압력에너지를 기계적 에너지로 변환시키는 유압시스템을 구성한다. 이와 같은 유압시스템에 있어서는 압유가 유압펌프의 구동에 의해 유압탱크로부터 유압실린더의 실린더하우징에 공급되면 실린더로드가 운동한다.In general, the hydraulic cylinder has a cylinder housing and a cylinder rod reciprocating inside the bore of the cylinder housing, and is connected to an oil tank, a hydraulic pump, and a directional valve to operate a hydraulic system that converts pressure energy into mechanical energy. Configure. In such a hydraulic system, when the hydraulic oil is supplied from the hydraulic tank to the cylinder housing of the hydraulic cylinder by driving the hydraulic pump, the cylinder rod moves.

종래기술의 유압실린더는 통상적으로 실린더로드가 실린더하우징의 개방부를 출몰하도록 구성되어 있으며, 실린더하우징과 실린더로드의 사이에는 실린더하우징의 개방부를 통한 누유와 외부로부터 이물질의 침입을 방지하기 위하여 여러 형태의 오일실(Oil Seal)이 제공되고 있다.Hydraulic cylinders of the prior art are typically configured to allow the cylinder rod to ooze the opening of the cylinder housing, and between the cylinder housing and the cylinder rod to prevent leakage of oil through the opening of the cylinder housing and intrusion of foreign matter from the outside. An oil seal is provided.

그러나, 종래기술의 유압실린더에서는 기계가공오차, 부적합한 실의 사용등으로 인하여 오일이 쉽게 누설되며, 유압실린더의 정밀성이 저하되거나 또는 노후될 경우 오일의 누설이 더욱 심화되는 문제점이 있다. 이와 같이 실린더하우징으로부터 누설되는 오일은 유압실린더의 주위를 오염시킬 뿐만 아니라 오일로 오염된 주변을 수시로 청소하여야 하는 번거로움을 야기시키는 문제가 있다. 또한, 일부 작업자는 누설되는 유압실린더의 사용을 기피하며, 한편으로는 유압실린더의 누유를 고장으로 오인하여 점검을 요구하기도 한다. 특히, 누유되는 유압실린더의 기계적인 성능에 대하여 일반인의 인식을 나쁘게 할 소지가 있었다.However, in the hydraulic cylinder of the prior art, the oil is easily leaked due to machining errors, the use of an inadequate seal, and there is a problem in that the leakage of oil is further intensified when the precision of the hydraulic cylinder is degraded or aged. In this way, the oil leaking from the cylinder housing not only contaminates the surroundings of the hydraulic cylinder, but also causes a problem of having to clean the oiled surroundings from time to time. In addition, some workers avoid the use of leaking hydraulic cylinders, and on the other hand, the hydraulic cylinders are mistaken for failure and require inspection. In particular, there was a possibility that the public's perception about the mechanical performance of the leaking hydraulic cylinder was bad.

따라서, 본 발명은 상기한 바와 같은 종래기술의 문제점을 해결하기 위하여 안출된 것으로, 본 발명의 목적은 유압실린더로부터 누설되는 오일을 오일탱크로 회수하여 외부로의 누유를 방지할 수 있는 유압실린더의 누유 회수장치를 제공함에 있다.Therefore, the present invention has been made to solve the problems of the prior art as described above, the object of the present invention is to recover the oil leaking from the hydraulic cylinder to the oil tank of the hydraulic cylinder that can prevent leakage to the outside The present invention provides a leak recovery apparatus.

도 1은 본 발명의 유압실린더가 적용되는 유압시스템의 유압회로도,1 is a hydraulic circuit diagram of a hydraulic system to which the hydraulic cylinder of the present invention is applied;

도 2는 본 발명에 따른 유압실린더의 누유 회수장치를 나타낸 단면도,2 is a cross-sectional view showing a leak oil recovery device of the hydraulic cylinder according to the present invention,

도 3은 본 발명에 따른 유압실린더의 누유 회수장치에서 제1 군의 오일실을 부분적으로 확대하여 나타낸 단면도,Figure 3 is a partially enlarged cross-sectional view showing the oil chamber of the first group in the oil leakage recovery device of the hydraulic cylinder according to the present invention,

도 4는 본 발명에 따른 유압실린더의 누유 회수장치에서 제2 군의 오일실을 부분적으로 확대하여 나타낸 단면도,4 is a partially enlarged cross-sectional view of the oil chamber of the second group in the oil leakage recovery apparatus of the hydraulic cylinder according to the present invention;

도 5는 본 발명에 따른 유압실린더의 누유 회수장치에서 드레인포트의 변형 실시예를 부분적으로 확대하여 나타낸 단면도이다.Figure 5 is a partially enlarged cross-sectional view showing a modified embodiment of the drain port in the oil leakage recovery apparatus of the hydraulic cylinder according to the present invention.

♣ 도면의 주요 부분에 대한 부호의 설명 ♣♣ Explanation of symbols for the main parts of the drawing ♣

10: 유압시스템 12: 유압라인10: Hydraulic system 12: Hydraulic line

14: 오일탱크 16: 유압펌프14: oil tank 16: hydraulic pump

18: 방향전환밸브 20: 유압실린더18: directional valve 20: hydraulic cylinder

22: 실린더하우징 32: 제1 포트22: cylinder housing 32: first port

34: 제2 포트 36: 실린더로드34: second port 36: cylinder rod

40: 제1 군의 오일실 50: 제2 군의 오일실40: oil chamber of the first group 50: oil chamber of the second group

60: 리세스 62: 드레인포트60: recess 62: drain port

64: 바이패스라인64: bypass line

이와 같은 목적을 달성하기 위한 본 발명의 특징은 유압라인에 의해 오일탱크와 유압펌프와 작동적으로 연결되어 오일탱크의 상측에 배치되고, 실린더하우징과 실린더로드 사이에 오일실이 제공되어 있는 유압실린더에 있어서, 실린더하우징의 외측 내면에 오일실을 통과하여 누설되는 오일이 집유되는 환상의 리세스가 형성되고, 상기 리세스에는 오일이 배출되는 드레인포트가 연장형성되고, 상기 드레인포트의 하측에는 바이패스라인이 위치하며, 이 바이패스라인은 오일탱크와 연결되는 유압실린더의 누유 회수장치에 있다.A characteristic of the present invention for achieving the above object is that the hydraulic cylinder is operatively connected to the oil tank and the hydraulic pump by the hydraulic line is disposed on the upper side of the oil tank, the oil cylinder is provided between the cylinder housing and the cylinder rod. An annular recess is formed in the outer inner surface of the cylinder housing through which an oil leaks through the oil chamber, and a drain port is formed in the recess, and a drain port is formed in the recess. The pass line is located, and this bypass line is located in the oil recovery unit of the hydraulic cylinder connected to the oil tank.

이하, 본 발명에 따른 유압실린더의 누유 회수장치에 대한 바람직한 실시예를 첨부된 도면들에 의거하여 상세하게 설명한다.Hereinafter, a preferred embodiment of the oil leakage recovery apparatus of the hydraulic cylinder according to the present invention will be described in detail with reference to the accompanying drawings.

도 1 내지 도 5는 본 발명에 따른 유압실린더의 누유 회수장치를 설명하기 위하여 나타낸 도면들이다.1 to 5 are diagrams for explaining the oil leakage recovery apparatus of the hydraulic cylinder according to the present invention.

먼저, 도 1을 참조하면, 유압시스템(10)에는 유압라인(12)에 의해서 오일탱크(14)와 유압펌프(16), 방향전환밸브(18), 유압실린더(20)가 작동적으로 연결되어 구성되고, 유압실린더(20)는 오일탱크(14)의 상방향에 수직하게 배치된다. 유압펌프(16)의 구동에 의해 오일탱크(14)로부터 유압라인(12)을 통하여 압유가 공급되면 유압실린더(20)가 작동되어 압력에너지가 기계적 에너지로 변환되며, 유압실린더(20)로부터 배출되는 압유는 유압라인(12)을 통하여 오일탱크(14)로 회수된다. 도면에는, 세개의 유압실린더(20)가 설치되어 있는 것을 나타냈으나 설치개수는 적절하게 변경할 수 있다.First, referring to FIG. 1, the oil tank 14, the hydraulic pump 16, the directional valve 18, and the hydraulic cylinder 20 are operatively connected to the hydraulic system 10 by the hydraulic line 12. The hydraulic cylinder 20 is disposed perpendicularly to the upward direction of the oil tank 14. When the hydraulic oil is supplied from the oil tank 14 through the hydraulic line 12 by the driving of the hydraulic pump 16, the hydraulic cylinder 20 is operated to convert the pressure energy into mechanical energy and discharged from the hydraulic cylinder 20. The pressure oil is recovered to the oil tank 14 through the hydraulic line (12). Although the figure shows that three hydraulic cylinders 20 are installed, the number of installations can be changed as appropriate.

실린더하우징(22)을 구비하는 유압실린더(20)가 도 2에 구체적으로 도시되어 있다. 실린더하우징(22)은 양측에 고정적으로 설치되는 제1 커버(28)와 제2 커버(30)를 구비하고 있다. 실린더하우징(22)은 보어(24)를 가지며, 제1 커버(28)는 개방부(26)을 가진다. 그리고, 제1 커버(28)와 제2 커버(30)에는 유압라인(12)이 연결되는 제1 포트(32)와 제2 포트(34)가 각각 형성되어 있다. 또한, 유압실린더(20)는 실린더하우징(22)의 보어(24) 내부를 왕복운동하여 개방부(26)를 출몰하는 실린더로드(36)를 구비한다.A hydraulic cylinder 20 with a cylinder housing 22 is shown in detail in FIG. 2. The cylinder housing 22 is provided with the 1st cover 28 and the 2nd cover 30 fixedly installed at both sides. The cylinder housing 22 has a bore 24 and the first cover 28 has an opening 26. The first cover 28 and the second cover 30 are formed with a first port 32 and a second port 34 to which the hydraulic line 12 is connected, respectively. In addition, the hydraulic cylinder 20 has a cylinder rod 36 for reciprocating the inside of the bore 24 of the cylinder housing 22 to shed the opening 26.

도 2 및 도 3을 참조하면, 제1 커버(28)의 내면에는 오일이 공급되는 제1 포트(32)가 형성되어 있고, 제1 포트(32)의 상측에는 제1 군의 오일실(40)이 제공되어 있다. 제1 군의 오일실(40)은 개방부(26)의 근접위치에서 실린더로드(36)의 외면에 부착되는 이물질이 실린더하우징(22)의 내부로 침입하는 것을 차단하는 실드링(Shield Ring: 42)과, 이 실드링(42)으로부터 이격되어 배치되는 제1 스텝실(Step Seal: 44a), 제1 웨어링(Wear Ring: 46a), 제2 스텝실(44b), 제2 웨어링(46b)의 연속적인 구성으로 되어 있다. 제1 및 제2 스텝실(44a, 44b)과 제1 및 제2 웨어링(46a, 46b)은 오일의 누설을 단계적으로 차단하여 누유를 최소화한다.2 and 3, a first port 32 through which oil is supplied is formed on an inner surface of the first cover 28, and the oil chamber 40 of the first group is disposed above the first port 32. ) Is provided. The oil chamber 40 of the first group has a shield ring to block foreign matter adhering to the outer surface of the cylinder rod 36 in the proximity of the opening part 26 to enter the cylinder housing 22. 42 and a first step seal 44a, a first wear ring 46a, a second step chamber 44b, and a second wear ring 46b, which are spaced apart from the shield ring 42. Has a continuous configuration. The first and second step chambers 44a and 44b and the first and second wear rings 46a and 46b block oil leakage step by step to minimize leakage.

도 2 및 도 4를 참조하면, 제2 커버(30)에는 오일이 공급되는 제2 포트(34)가 형성되어 있으며, 제2 포트(34)의 상측에는 실린더로드(38)의 외면에 제2 군의 오일실(50)이 제공되어 있다. 제2 군의 오일실(50)은 제1 웨어링(52a)과 제2 웨어링(52b), 제1 웨어링(52a)과 제2 웨어링(52b) 사이에 배치되는 스텝실(54)의 연속적인 구성으로 되어 있다.2 and 4, a second port 34 to which oil is supplied is formed in the second cover 30, and a second port 34 is formed on the outer surface of the cylinder rod 38 above the second port 34. A group of oil chambers 50 is provided. The oil chamber 50 of the second group has a continuous configuration of the step chamber 54 disposed between the first wear ring 52a and the second wear ring 52b, and the first wear ring 52a and the second wear ring 52b. It is.

도 1 내지 도 3에 보이는 바와 같이, 본 발명의 특징적인 실시태양에 따라 실린더하우징(22)의 제1 커버(28)의 상측 내면에 누설되는 오일이 집유되는 환상의 리세스(Recess: 60)가 형성된다. 도면에서, 리세스(60)는 제1 군의 오일링(40)의 실드링(42)과 제1 스텝실(44a) 사이에 하나가 형성되어 있는 것을 나타냈으나 그 형성개수 및 위치는 적절하게 변경할 수 있다. 리세스(60)의 소정의 위치에는 리세스(60)의 폭보다 작은 크기의 구멍을 갖는 드레인포트(Drain Port: 62)가리세스(60)의 중앙부에 대하여 하방으로 치우쳐 형성된다. 이에 따라, 리세스(60)에 집유되는 오일은 리세스(60)의 상측 내벽면에 도달하기 전에 드레인포트(62)를 통하여 배출된다. 그리고, 드레인포트(62)에는 드레인포트(62)의 위치보다 낮은 위치로 연장되는 바이패스라인(64)이 접속되고, 바이패스라인(64)은 오일탱크(14)와 연결된다.1 to 3, an annular recess 60 in which oil leaks on the upper inner surface of the first cover 28 of the cylinder housing 22 is collected according to a characteristic embodiment of the present invention. Is formed. In the figure, the recess 60 shows that one is formed between the shield ring 42 and the first step chamber 44a of the oil ring 40 of the first group, but the number and position of the formation are appropriate. Can be changed. At a predetermined position of the recess 60, a drain port 62 having a hole smaller than the width of the recess 60 is formed to be biased downward with respect to the center portion of the recess 60. Accordingly, the oil collected in the recess 60 is discharged through the drain port 62 before reaching the upper inner wall surface of the recess 60. In addition, a bypass line 64 is connected to the drain port 62 that extends to a position lower than that of the drain port 62, and the bypass line 64 is connected to the oil tank 14.

이와 같은 구성을 갖는 유압실린더의 누유 회수장치에 있어서는, 실린더하우징(22)의 제1 및 제2 포트(32, 34)중의 하나를 통하여 압유가 공급되면, 실린더로드(36)는 실린더하우징(22)의 내부를 왕복운동한다. 이러한 실린더로드(36)의 왕복운동에 의해 제1 군의 오일실(40)에 의하여 차단되지 않고 제1 군의 오일실(40)의 제1 스텝실(44a)을 통과한 오일은 리세스(60)에 집유된다. 리세스(60)에 집유된 누유는 드레인포트(62)가 리세스(60)의 하측에 치우쳐 위치하므로 드레인포트(62)를 통하여 용이하게 배출되고, 바이패스라인(64)을 통하여 오일탱크(14)에 회수된다. 이에 따라, 제1 커버(28)의 개방부(26)를 통하여 오일이 외부로 누설되는 것이 방지된다.In the hydraulic oil recovery apparatus of the hydraulic cylinder having such a configuration, when the hydraulic oil is supplied through one of the first and second ports 32, 34 of the cylinder housing 22, the cylinder rod 36 is the cylinder housing 22 Reciprocate the inside. The oil passing through the first step chamber 44a of the oil chamber 40 of the first group without being blocked by the oil chamber 40 of the first group by the reciprocating motion of the cylinder rod 36 is recessed ( Housed in 60). The oil leakage collected in the recess 60 is easily discharged through the drain port 62 because the drain port 62 is positioned below the recess 60, and the oil tank (B) through the bypass line 64. 14). Accordingly, the oil is prevented from leaking to the outside through the opening 26 of the first cover 28.

도 5에는 본 발명에 따른 누유 회수장치의 변형 실시예가 나타나 있다. 도 5를 살펴보면, 드레인포트(62)는 제1 커버(28)의 상측에서 하측으로 경사지게 형성되어 있다. 따라서, 리세스(60)에 집유되는 오일은 드레인포트(62)를 원활하게 통과함으로써 바이패스라인(64)으로 용이하게 배출된다.Figure 5 shows a modified embodiment of the oil leakage recovery apparatus according to the present invention. Referring to FIG. 5, the drain port 62 is formed to be inclined downward from the upper side of the first cover 28. Therefore, the oil collected in the recess 60 is easily discharged to the bypass line 64 by smoothly passing through the drain port 62.

상기한 실시예들은 본 발명의 바람직한 실시예들을 설명한 것에 불과하고, 본 발명의 권리범위는 예시한 실시예에 한정되는 것은 아니며 청구범위내에서 다양하게 변경할 수 있다. 예를 들어 본 발명의 실시예에 나타난 각 구성 요소의 형상 및 구조는 변형하여 실시할 수 있는 것이다.The above embodiments are merely illustrative of the preferred embodiments of the present invention, the scope of the present invention is not limited to the illustrated embodiment can be variously changed within the claims. For example, the shape and structure of each component shown in the embodiment of the present invention can be modified.

이상에서 설명한 바와 같이, 본 발명에 따른 유압실린더의 누유 회수장치에 의하면, 실린더로드를 작동하는 오일이 실린더하우징의 외부로 누설됨이 없이 오일실의 외측에 형성된 리세스의 드레인포트를 통하여 오일탱크로 바이패스되므로, 유압실린더의 오염을 방지하고 유압실린더를 채용한 제품의 신뢰성을 향상시키는 효과가 있다.As described above, according to the oil leakage recovery apparatus of the hydraulic cylinder according to the present invention, the oil tank for operating the cylinder rod through the drain port of the recess formed on the outside of the oil chamber without leaking to the outside of the cylinder housing Since it is bypassed, there is an effect of preventing contamination of the hydraulic cylinder and improving the reliability of the product employing the hydraulic cylinder.

Claims (3)

유압라인에 의해 오일탱크와 유압펌프와 작동적으로 연결되어 상기 오일탱크의 상측에 배치되고, 실린더하우징과 실린더로드 사이에 오일실이 제공되어 있는 유압실린더에 있어서,In the hydraulic cylinder which is operatively connected to the oil tank and the hydraulic pump by a hydraulic line and disposed above the oil tank, an oil chamber is provided between the cylinder housing and the cylinder rod, 상기 실린더하우징의 오일실의 외측 내면에 상기 오일실을 통과하여 누설되는 오일이 집유되는 환상의 리세스가 형성되고, 상기 리세스에는 오일이 배출되는 드레인포트가 연장형성되고, 상기 드레인포트의 하측에는 바이패스라인이 위치하며, 이 바이패스라인는 상기 오일탱크와 연결되는 것을 특징으로 하는 유압실린더의 누유 회수장치.An annular recess is formed on an outer inner surface of the oil chamber of the cylinder housing to collect oil leaking through the oil chamber, and the recess has an extended drain port formed therein, and a lower side of the drain port. There is a bypass line, the bypass line is oil leakage collection device of the hydraulic cylinder, characterized in that connected to the oil tank. 제 1 항에 있어서, 상기 드레인포트의 직경은 상기 리세스의 폭보다 작게 형성되고, 상기 드레인포트는 상기 리세스의 일측에 치우쳐 형성되는 것을 특징으로 하는 유압실린더의 누유 회수장치.The oil leakage collection apparatus of claim 1, wherein a diameter of the drain port is smaller than a width of the recess, and the drain port is formed on one side of the recess. 제 1 항 또는 제2항에 있어서, 상기 드레인포트는 경사지게 형성되는 것을 특징으로 하는 유압실린더의 누유 회수장치.The oil leakage collection apparatus of claim 1 or 2, wherein the drain port is formed to be inclined.
KR1020000010989A 2000-03-06 2000-03-06 Apparatus for collecting oil leakage of hydraulic cylinder KR20010086962A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101335954B1 (en) * 2013-01-18 2013-12-04 (주)제일피엠씨 Joystice pilot valve with oil leakage prevention structure
CN106122168A (en) * 2016-08-31 2016-11-16 大唐岩滩水力发电有限责任公司 A kind of blockage resisting oil cylinder maintenance discharge equipment
CN112855651A (en) * 2019-11-12 2021-05-28 上海朝田实业股份有限公司 High-precision hydraulic cylinder

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101335954B1 (en) * 2013-01-18 2013-12-04 (주)제일피엠씨 Joystice pilot valve with oil leakage prevention structure
CN106122168A (en) * 2016-08-31 2016-11-16 大唐岩滩水力发电有限责任公司 A kind of blockage resisting oil cylinder maintenance discharge equipment
CN112855651A (en) * 2019-11-12 2021-05-28 上海朝田实业股份有限公司 High-precision hydraulic cylinder

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