KR100774324B1 - Lubrication relief valve of cylinder de-activation engine - Google Patents

Lubrication relief valve of cylinder de-activation engine Download PDF

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Publication number
KR100774324B1
KR100774324B1 KR1020060079507A KR20060079507A KR100774324B1 KR 100774324 B1 KR100774324 B1 KR 100774324B1 KR 1020060079507 A KR1020060079507 A KR 1020060079507A KR 20060079507 A KR20060079507 A KR 20060079507A KR 100774324 B1 KR100774324 B1 KR 100774324B1
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South Korea
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valve body
oil
valve
cylinder
oil inlet
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KR1020060079507A
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Korean (ko)
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황순현
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현대자동차주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/16—Controlling lubricant pressure or quantity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
    • F02D17/02—Cutting-out
    • 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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

A relief valve for lubrication of a cylinder de-activation engine is provided to prevent wear of a CDA operation mechanism due to supply insufficiency of lubrication oil by forming first and second flow paths and supplying the lubrication oil to the CDA operation mechanism when an engine is started. A relief valve for lubrication of a cylinder de-activation engine comprises a valve body part(4), a valve mechanism(6) and a flow path member(8). The valve body part is a cylinder member, provided with a male screw part(10) in an outer circumference of a lower part, screw-coupled to a main oil gallery and formed with a circumference groove in an inner wall side of an oil inflow part formed with a first through-hole. The valve mechanism is installed in the oil inflow part(16) of the valve body part, and includes a flanger(14) formed with a second orifice(28), a check ball(22) lifted on an upper side of the second orifice and an elastic member(24) elastically supporting the check ball. The flow path member is coupled to an outer circumference of the valve body part, and forms one flow path receiving first and second through-holes in an inner circumference.

Description

실린더 액티베이션 엔진의 윤활용 릴리이프 밸브{LUBRICATION RELIEF VALVE OF CYLINDER DE-ACTIVATION ENGINE}LUBRICATION RELIEF VALVE OF CYLINDER DE-ACTIVATION ENGINE}

도 1은 본 발명에 의한 릴리이프 밸브의 단면 사시도.1 is a cross-sectional perspective view of a relief valve according to the present invention.

도 2는 본 발명에 의한 릴리이프 밸브의 1차 유로 형성시의 단면도.2 is a cross-sectional view at the time of forming the primary flow path of the relief valve according to the present invention.

도 3은 본 발명에 의한 릴리이프 밸브의 2차 유로 형성시의 단면도.3 is a cross-sectional view at the time of forming the secondary flow path of the relief valve according to the present invention.

도 4는 종래 릴리이프 밸브의 단면 사시도이다.4 is a cross-sectional perspective view of a conventional relief valve.

본 발명은 실린더 액티베이션 엔진의 윤활용 릴리이프 밸브에 관한 것으로서, 보다 상세하게는 아이들 상태와 같은 낮은 회전 영역에서도 CDA (CYLINDER DE-ACTIVATION) 조작기구에 윤활 오일이 공급되도록 하여 윤활 효과를 높일 수 있도록 한 실린더 액티베이션 엔진의 오일 샤워 기구 윤활용 릴리이프 밸브에 관한 것이다.The present invention relates to a relief valve for lubrication of a cylinder activation engine. More specifically, the lubricating oil is supplied to a CDA (CYLINDER DE-ACTIVATION) operating mechanism in a low rotational region such as an idle state so that the lubrication effect can be improved. A relief valve for lubricating an oil shower mechanism of a cylinder activation engine.

실린더 액티베이션(CYLINDER DE-ACTIVATION) 즉, CDA는 제동시나 정속 주행시에 전체 실린더 중 일부를 휴지시키는 기술을 말하는 것으로서, CDA 작동중에는 휴지 대상이 되는 실린더로의 연료 공급과 흡/배기 밸브의 작동이 정지하게 된다.CYLINDER DE-ACTIVATION, or CDA, refers to a technique for stopping part of the entire cylinder during braking or at constant speed. During CDA operation, the fuel supply and the intake / exhaust valve of the cylinder to be stopped are stopped. Done.

CDA 엔진의 일예로서 V8 기통 엔진을 일예로서 살펴보면, 주행상태에서 제동을 할 때에는 모든 기통을 작동시켜 동력을 발생시킬 필요가 없으므로, 각 뱅크에서 2개의 실린더의 작동은 정지(휴지)시키고 나머지 2개(총 4개의 실린더)의 실린더만으로 엔진을 작동시킴으로써, 연비의 향상을 도모하는 것이 본 발명이 관계하는 CDA인 것이다.As an example of the CDA engine, the V8 cylinder engine is shown as an example. When braking in driving state, it is not necessary to generate power by operating all cylinders. Therefore, the operation of two cylinders in each bank is stopped (rested) and the other two are stopped. It is the CDA which this invention relates to to improve fuel economy by operating an engine only by the cylinder of 4 cylinders in total.

그리고 CDA는 정속 주행시에고 적용할 수 있는데, 이때에는 4개의 실린더만으로 정속 주행에 필요한 동력을 발생시켜야 하는 바, 연료 분사량과 흡입 공기량을 증가시켜 8기통 엔진 전체 연소시보다 높은 연소압을 발생시켜야 하는 차이가 있는 것이다. In addition, CDA can be applied at constant speed. At this time, only four cylinders should be used to generate the power required for constant speed. The fuel injection amount and the intake air amount must be increased to generate a higher combustion pressure than the entire 8-cylinder engine. There is a difference.

이러한 CDA 엔진에 있어서는 실린더의 정지 기술을 적용하기 위해서는 무었 보다 중용한 것은 적정한 윤활 유압과 작동기구의 윤활이다.In such a CDA engine, in order to apply a cylinder stop technique, what is more important is proper lubrication oil pressure and lubrication of an operating mechanism.

이와같이 작동 유압을 유지하기 위하여는 메인 오일 캘러리의 적정 위치에 릴리이프 밸브를 적용하고, 상기 릴리이프 밸브의 유압은 밸브기구의 HLA(Hydraulic Lash Adjuster)를 이용하는 것이 보편적이다.In order to maintain the operating hydraulic pressure in this way, it is common to apply a relief valve at a proper position of the main oil calories, and the hydraulic pressure of the relief valve is generally used by using a hydraulic lash adjuster (HLA) of the valve mechanism.

그리고 상기의 릴리이브 밸브를 형성함에 있어서, 종래에는 도 4에서와 같이 메인 오일 갤러리의 체결 고정되는 밸브 몸체부(100)의 내부에 세로방향으로 대직경의 밸브 안착부(102)와 소직경의 오일 유입부(104)가 형성되고, 상기 밸브 안착부(102)의 하부 양측으로는 수평방향으로 오일 유출구(106)가 형성된다.And in forming the above relief valve, conventionally the valve seat portion 102 and the small diameter of the large diameter in the longitudinal direction in the interior of the valve body portion 100 is fastened and fixed in the main oil gallery as shown in FIG. An oil inlet 104 is formed, and oil outlets 106 are formed on both sides of the lower portion of the valve seat 102 in the horizontal direction.

또한, 밸브 안착부(102)의 하측에는 오일 유입부(104)를 개폐할 수 있는 플런저(108)가 배치되고, 상기 플런저(108)의 상측에는 탄성부재(110)가 배치되어 항 상 상기 플런저(106)를 하측으로 밀어주게 된다.In addition, a plunger 108 for opening and closing the oil inlet 104 is disposed below the valve seat 102, and an elastic member 110 is disposed above the plunger 108 so that the plunger is always provided. Push 106 down.

이에 따라 엔진의 회전수가 상승하여 오일 압이 상승할 때, 특정 영역(3bar)을 벗어나 상승하게 되면 이의 오일 압에 의하여 플런저(108)가 밀려 올라가면서 오일 유압부(104)를 개방함으로써, 오일이 유출구(106)를 통해 빠져 나감으로써, 오일압은 항상 특정 영역내에서 제어가 되는 것이다.Accordingly, when the engine speed is increased to increase the oil pressure, when the oil pressure rises out of a specific region (3 bar), the plunger 108 is pushed up by the oil pressure thereof, and the oil hydraulic part 104 is opened to open the oil. By exiting through the outlet 106, the oil pressure is always controlled within a specific area.

그리고 유출구(106)를 빠져 나온 오일은 HLA로 공급되며, 도면중 미설명 부호 112는 탄성부재(110)를 지지하여 주는 고정컵이다.The oil exiting the outlet 106 is supplied to the HLA, and reference numeral 112 in the figure is a fixing cup for supporting the elastic member 110.

그러나 상기와 같은 윤활 방식에 있어서는 아이들 상태와 같은 낮은 회전 영역이나 오일의 온도가 높아지는 경우에는 유압이 떨어짐으로써 HLA측으로 유압 공급이 제대로 이루어지지 않게 되는 바, CDA 작동기구의 마모를 촉진시킨다는 문제점을 내포하고 있다.However, in the lubrication system as described above, when the oil temperature is lowered in a low rotational area such as an idle state or the oil temperature is increased, the hydraulic pressure is not properly supplied to the HLA side. Doing.

따라서 본 발명은 상기와 같은 문제점을 해결하기 위하여 발명된 것으로서, 본 발명의 목적은 아이들 상태와 같은 낮은 회전 영역에서도 CDA (CYLINDER DE-ACTIVATION) 조작기구에 윤활 오일이 공급되도록 하여 윤활 효과를 높일 수 있도록 한 실린더 액티베이션 엔진의 윤활용 릴리이프 밸브를 제공함에 있다.Therefore, the present invention has been invented to solve the above problems, an object of the present invention is to provide a lubricating oil to the CDA (CYLINDER DE-ACTIVATION) operating mechanism in the low rotational region, such as idle state to increase the lubrication effect To provide a relief valve for lubrication of a cylinder activation engine.

이를 실현하기 위하여 본 발명은, 원통부재로서 하부 외주연에 숫나사부가 형성되어 메인 오일 갤러리에 나사 결합되며, 그의 내부에는 하측으로 대직경의 오일 유입부를 형성하고, 이의 오일 유입구의 상측에는 소직경의 탄성부재 안착부를 형성하며, 상기 오일 유입부의 상측과 탄성부재 안착부의 하측에 각각 제1, 2통공이 형성되며, 상기 제1 통공이 형성되는 오일 유입부의 내벽측에는 둘레홈이 요입 형성되는 밸브 몸체부와; 상기 밸브 몸체부의 오일 유입부에 승강 가능하게 설치되며, 측벽에는 최상측에서 제1 통공과 연결되지 않고, 최하단에서 제1 통공과 동일 선상에 위치되도록 제1 오리피스가 형성되고, 상측면 중앙에는 제2 오리피스가 형성되는 플런저와, 상기 제2 오리피스의 상측에 올려지는 첵볼과, 상기 첵볼을 탄성적으로 지지하여 주는 탄성부재로 이루어지는 밸브기구와; 상기 밸브 몸체부의 외주측에 결합되며, 그 내주면에는 상기 제1, 2 통공을 수용하는 하나의 유로를 형성하며, 그 외주면 양측에는 CDA 조작기구까지 연통되는 유출구가 일체로 형성되는 유로부재를 포함하는 것을 특징으로 하는 실린더 액티베이션 엔진의 윤활용 릴리이프 밸브를 제공한다. In order to realize this, the present invention, a male member is formed on the lower outer periphery as a cylindrical member and screwed to the main oil gallery, the inner side of the oil inlet of a large diameter, the upper side of the oil inlet of the small diameter An elastic member seating portion is formed, and first and second holes are formed at an upper side of the oil inlet portion and a lower portion of the elastic member seating portion, respectively, and a valve body portion having a circumferential groove formed in an inner wall side of the oil inlet portion in which the first through hole is formed. Wow; It is installed to be elevated in the oil inlet portion of the valve body portion, the first side orifice is formed on the side wall is not connected to the first through hole at the uppermost side, and located on the same line as the first through hole at the bottom end, A valve mechanism comprising a plunger in which two orifices are formed, a weft ball mounted on an upper side of the second orifice, and an elastic member for elastically supporting the weft ball; Is coupled to the outer circumferential side of the valve body portion, the inner circumferential surface is formed with one flow path for receiving the first, second through hole, the outer circumferential surface includes a flow path member which is integrally formed with the outlet port communicated to the CDA operation mechanism Provided is a relief valve for lubrication of a cylinder activation engine.

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이하, 상기의 목적을 구체적으로 실현할 수 있는 본 발명의 바람직한 실시예를 첨부한 도면에 의거하여 상세히 설명하면 다음과 같다.Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described in detail.

도 1은 본 발명에 의한 릴리이프 밸브의 단면도로서, 상기 릴리이프 밸브(2)는 크게 밸브 몸체부(4)와 밸브기구(6) 그리고 유로부재(8)를 포함하여 이루어진다.1 is a cross-sectional view of a relief valve according to the present invention, wherein the relief valve 2 largely comprises a valve body portion 4, a valve mechanism 6, and a flow path member 8.

상기 밸브 몸체부(4)는 원통부재로서 하부 외주연에 숫나사부(10)가 형성되어 미도시한 메인 오일 갤러리에 나사 결합되며, 그의 내부에는 플런저(14)가 승강될 수 있는 대직경의 오일 유입부(16)가 형성되고, 상기 오일 유입구(16)의 상측에는 소직경의 탄성부재 안착부(18)가 형성됨으로써, 이들 경계부에는 단턱(20)이 형성된다.The valve body portion 4 is a cylindrical member having a male thread portion 10 formed at a lower outer circumference thereof and screwed to a main oil gallery (not shown), and having a large diameter oil in which a plunger 14 can be elevated. An inlet 16 is formed, and a small diameter elastic member seating portion 18 is formed on the upper side of the oil inlet 16, so that the step 20 is formed at these boundaries.

그리고 상기 밸브기구(6)는 상기의 플런저(14)와 첵볼(22), 그리고 상기 첵 볼(22)를 탄성적으로 지지하여 주는 탄성부재(24)를 포함하여 이루어진다.The valve mechanism 6 includes the plunger 14, the ear ball 22, and an elastic member 24 that elastically supports the ear ball 22.

상기 플런저(14)는 하측이 개구되는 컵 형태로 이루어져 측벽에 수평방향으로 제1 오리피스(26)가 형성되고, 상측면 중앙부에는 수직방향으로 제2 오리피스(28)이 형성된다.The plunger 14 has a cup shape in which a lower side is opened, and a first orifice 26 is formed in a horizontal direction on a side wall, and a second orifice 28 is formed in a vertical direction in a central portion of an upper side.

그리고 상기 첵볼(22)은 상기 제2 오리피스(28)의 상측에 올려져 탄성부재(24)에 의하여 탄성적으로 지지되며, 상기 탄성부재(24)는 탄성부재 안착부(18)의 상측에서 삽입 고정되는 고정 컵(30)에 의하여 지지된다.And the ear ball 22 is mounted on the upper side of the second orifice 28 is elastically supported by the elastic member 24, the elastic member 24 is inserted from the upper side of the elastic member seating portion 18 It is supported by a fixed cup 30 that is fixed.

또한, 상기 밸브 몸체부(4)의 측벽에는 플런저(14)가 최단으로 내려왔을 때 상기 제1 오리피스(26)와 동일 선상으로 제1 통공(32)이 형성되고, 이 제1 통공(32)의 내벽측에는 둘레홈(34)이 요입 형성된다.In addition, a first through hole 32 is formed on the side wall of the valve body 4 in the same line as the first orifice 26 when the plunger 14 is lowered to the shortest, and the first through hole 32 is formed. In the inner wall side of the circumferential groove 34 is formed concave.

상기에서 둘레홈(34)의 상측은 플런저(14)가 최상단으로 상승하였을 때, 제1 오리피스(26)와 연통되지 않도록 그 하부에 위치할 수 있도록 형성한다.In the above, the upper side of the circumferential groove 34 is formed to be located below the plunger 14 so as not to communicate with the first orifice 26 when raised to the top.

그리고 상기 단턱(20)의 상부 양측에는 수평 방향으로 제2 통공(36)이 형성되어 제2 오리피스(28)를 통과한 오일이 외부로 유출될 수 있도록 하였다.In addition, a second through hole 36 is formed at both sides of the upper end of the step 20 in a horizontal direction so that oil passing through the second orifice 28 can flow out.

상기 유로 부재(8)는 상기 제1, 2 통공(32)(36)을 수용하여 하나의 유로(38)를 형성할 수 있도록 밸브 몸체부(4)의 외주측에 결합되며, 이의 유로부재(8) 양측에는 유출구(40)가 형성되어 미도시한 CDA 조작기구까지 연통된다.The flow path member 8 is coupled to the outer circumferential side of the valve body portion 4 so as to receive the first and second through holes 32 and 36 to form one flow path 38, and the flow path member ( 8) Outlets 40 are formed at both sides to communicate with the CDA control mechanism (not shown).

이와 같이 구성되는 릴리이프 밸브(2)에 의하면, 오일압이 낮은 경우(3bar 이하)에는 도 2에서와 같이 메인 오일 갤러리의 오일이 플런저(14)의 제1 오리피스(26)와 제1 통공(32)를 통해 CDA 조작기구측으로 공급되면서 제1차 유로를 형성 하게 된다.According to the relief valve 2 configured as described above, when the oil pressure is low (3 bar or less), as shown in FIG. 2, the oil of the main oil gallery is formed by the first orifice 26 and the first through hole (of the plunger 14). 32) it is supplied to the CDA operation mechanism side to form a primary flow path.

그리고 오일 압이 높아지는 경우(3bar 이상)에는 도 3에서와 같이 오일 압에 의하여 플런저(14)가 상승하게 되는데, 이때 플런저(14)는 단턱(20)에 걸려 정지하면서 상기의 제1 오리피스(26)가 막히게 된다.When the oil pressure is increased (more than 3 bar), the plunger 14 is raised by the oil pressure as shown in FIG. 3, wherein the plunger 14 is caught by the step 20 while stopping the first orifice 26. ) Get blocked.

이후에는 오일 압에 의하여 첵볼(22)이 상승하여 제2 오리피스(28)가 개방되고, 이의 오일 압은 제2 통공(36)을 통해 미도시한 CDA 조작기구측으로 공급되면서 제2차 유로를 형성하게 되는 것이다.Thereafter, the ear ball 22 is lifted by the oil pressure to open the second orifice 28, and the oil pressure thereof is supplied to the CDA operating mechanism not shown through the second through hole 36 to form the second flow path. Will be done.

이상에서와 같이 본 발명에 의하면, 아이들 상태와 같은 오일 압이 낮은 회전 영역에서 제1차 유로를 형성하고, 오일 압이 높은 고속의 영역에서 제2차 유로를 형성하게 되는 바, 엔진이 시동이 이루어지면 언제나 CDA 조작기구에 윤활 오일이 공급되도록 함으로써, 윤활 오일의 공급 부족에 의한 CDA 조작기구의 마모를 방지할 수 있는 발명인 것이다.As described above, according to the present invention, the primary flow path is formed in the rotational region of low oil pressure such as the idle state, and the secondary flow path is formed in the high speed region of high oil pressure. When the lubricating oil is supplied to the CDA operating mechanism at all times, the invention can prevent the wear of the CDA operating mechanism due to the lack of supply of lubricating oil.

Claims (3)

원통부재로서 하부 외주연에 숫나사부가 형성되어 메인 오일 갤러리에 나사 결합되며, 그의 내부에는 하측으로 대직경의 오일 유입부를 형성하고, 이의 오일 유입구의 상측에는 소직경의 탄성부재 안착부를 형성하며, 상기 오일 유입부의 상측과 탄성부재 안착부의 하측에 각각 제1, 2통공이 형성되며, 상기 제1 통공이 형성되는 오일 유입부의 내벽측에는 둘레홈이 요입 형성되는 밸브 몸체부와;As a cylindrical member, a male thread part is formed on the lower outer periphery and screwed to the main oil gallery, and a large diameter oil inlet part is formed in a lower side thereof, and a small diameter elastic member seating part is formed on an upper side of the oil inlet part thereof. First and second holes are formed at an upper side of the oil inlet and a lower part of the elastic member seating unit, respectively, and a valve body portion having a circumferential groove formed at an inner wall side of the oil inlet unit in which the first through hole is formed; 상기 밸브 몸체부의 오일 유입부에 승강 가능하게 설치되며, 측벽에는 최상측에서 제1 통공과 연결되지 않고, 최하단에서 제1 통공과 동일 선상에 위치되도록 제1 오리피스가 형성되고, 상측면 중앙에는 제2 오리피스가 형성되는 플런저와, 상기 제2 오리피스의 상측에 올려지는 첵볼과, 상기 첵볼을 탄성적으로 지지하여 주는 탄성부재로 이루어지는 밸브기구와;It is installed to be elevated in the oil inlet portion of the valve body portion, the first side orifice is formed on the side wall is not connected to the first through hole at the uppermost side, and located on the same line as the first through hole at the bottom end, A valve mechanism comprising a plunger in which two orifices are formed, a weft ball mounted on an upper side of the second orifice, and an elastic member for elastically supporting the weft ball; 상기 밸브 몸체부의 외주측에 결합되며, 그 내주면에는 상기 제1, 2 통공을 수용하는 하나의 유로를 형성하며, 그 외주면 양측에는 CDA 조작기구까지 연통되는 유출구가 일체로 형성되는 유로부재;를 포함하는 것을 특징으로 하는 실린더 액티베이션 엔진의 윤활용 릴리이프 밸브. A flow passage member coupled to an outer circumferential side of the valve body portion, the inner circumferential surface forming one flow passage for accommodating the first and second through holes, and a flow passage member integrally formed at both sides of the outer circumferential surface to communicate with the outlet of the CDA operation mechanism; A lubricating relief valve for a cylinder activation engine, characterized in that 삭제delete 삭제delete
KR1020060079507A 2006-08-22 2006-08-22 Lubrication relief valve of cylinder de-activation engine KR100774324B1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03129187A (en) * 1989-10-06 1991-06-03 Kayaba Ind Co Ltd Pressure control valve
JPH04105913U (en) * 1991-02-26 1992-09-11 株式会社アツギユニシア oil relief device
JPH05195742A (en) * 1992-01-24 1993-08-03 Nissan Motor Co Ltd Relief valve
JPH08158839A (en) * 1994-11-30 1996-06-18 Aisin Seiki Co Ltd Oil pump device
KR20040040503A (en) * 2002-11-07 2004-05-13 현대자동차주식회사 Relief valve having secondary plunger

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03129187A (en) * 1989-10-06 1991-06-03 Kayaba Ind Co Ltd Pressure control valve
JPH04105913U (en) * 1991-02-26 1992-09-11 株式会社アツギユニシア oil relief device
JPH05195742A (en) * 1992-01-24 1993-08-03 Nissan Motor Co Ltd Relief valve
JPH08158839A (en) * 1994-11-30 1996-06-18 Aisin Seiki Co Ltd Oil pump device
KR20040040503A (en) * 2002-11-07 2004-05-13 현대자동차주식회사 Relief valve having secondary plunger

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