KR20060070014A - Camfollower of variable valve lift system - Google Patents

Camfollower of variable valve lift system Download PDF

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Publication number
KR20060070014A
KR20060070014A KR1020040108631A KR20040108631A KR20060070014A KR 20060070014 A KR20060070014 A KR 20060070014A KR 1020040108631 A KR1020040108631 A KR 1020040108631A KR 20040108631 A KR20040108631 A KR 20040108631A KR 20060070014 A KR20060070014 A KR 20060070014A
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South Korea
Prior art keywords
variable valve
cam follower
valve lift
spring
outer body
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KR1020040108631A
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Korean (ko)
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KR100600139B1 (en
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오정한
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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
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2305/00—Valve arrangements comprising rollers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2810/00—Arrangements solving specific problems in relation with valve gears
    • F01L2810/02—Lubrication
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

본 발명은 가변 밸브 리프트 기구의 캠팔로어에 관한 것으로, 중앙에 롤러가 일체로 형성된 인너 바디와, 상면에 패드가 구비된 아우터 바디로 구성되고, 상기 아우터 바디의 일측에는 러스트 모션 스프링이 설치되며, 타측에는 오일통로가 형성된 가변 밸브 리프트 기구의 캠팔로어에 있어서, 상기 오일통로에 대하여 수직방향으로 리턴스프링에 의해 탄력지지되는 록 핀을 설치하되, 상기 록 핀의 일측에는 원주상에 오일통과홈이 다수 형성된 스프링 시트를 장착하고, 타단에는 스냅 링을 설치하여 상기 스프링 시트와 스냅 링 사이에 상기 리턴 스프링을 설치하여 구성함으로써 가변 밸브 리프트 기구의 하이 리프트 변환시 캠팔로어의 인너 바디와 아우터 바디를 구속하는 록킹 동작의 불량으로 인한 응력집중이 방지되고 캠 팔로어가 원활한 작동을 실시하게 되어 오일압력을 낮출 수 있어 마찰 저감 효과가 있다.The present invention relates to a cam follower of a variable valve lift mechanism, comprising an inner body having a roller integrally formed at the center thereof, and an outer body provided with a pad at an upper surface thereof, and having a rust motion spring installed at one side of the outer body. In the cam follower of the variable valve lift mechanism having the oil passage formed on the other side, a lock pin which is elastically supported by the return spring in the vertical direction with respect to the oil passage is installed, and on one side of the lock pin, an oil passage groove is formed on the circumference. The spring seat is provided with a plurality of spring seats, and a snap ring is installed at the other end to install the return spring between the spring seat and the snap ring to restrain the inner body and outer body of the cam follower during high lift conversion of the variable valve lift mechanism. Stress concentration due to poor locking operation is prevented and the cam follower operates smoothly. The oil pressure can be lowered to reduce friction.

가변 밸브 리프트, 캠팔로어, 인너 바디, 아우터 바디, 록 핀, 리턴스프링Variable valve lifts, cam followers, inner bodies, outer bodies, lock pins, return springs

Description

가변 밸브 리프트 기구의 캠팔로어{Camfollower of Variable Valve Lift System}Cam follower of variable valve lift mechanism

도 1은 일반적인 차량 엔진의 가변밸브 리프트 기구의 사시도.1 is a perspective view of a variable valve lift mechanism of a general vehicle engine.

도 2는 종래 기술에 의한 가변밸브 리프트 기구의 캠팔로어의 사시도.Figure 2 is a perspective view of the cam follower of the variable valve lift mechanism according to the prior art.

도 3은 종래 기술에 의한 캠팔로어의 단면도.Figure 3 is a cross-sectional view of the cam follower according to the prior art.

도 4는 본 발명에 의한 가변밸브 리프트 기구의 캠팔로어의 사시도.Figure 4 is a perspective view of the cam follower of the variable valve lift mechanism according to the present invention.

도 5 및 도 6은 본 발명에 의한 캠팔로어의 동작상태 단면도.5 and 6 are cross-sectional view of the operating state of the cam follower according to the present invention.

< 도면의 주요 부분에 대한 부호의 설명 ><Description of Symbols for Main Parts of Drawings>

100 ; 캠팔로어 110 ; 인너 바디100; Camp followers 110; Inner body

112 ; 롤러 120 ; 아우터 바디112; Roller 120; Outer body

122,124 ; 패드 130 ; 로스트 모션 스프링122,124; Pad 130; Lost motion spring

140 ; 오일통로 150 ; 리턴스프링140; Oil channel 150; Return spring

160 ; 록 핀 162 ; 절취부160; Lock pin 162; Cutout

170 ; 스프링 시트 172 ; 오일통과홈170; Spring seat 172; Oil Passing Groove

180 ; 스냅 링180; Snap ring

본 발명은 차량용 엔진에 설치되는 가변 밸브 리프트(Variable Valve Lift) 기구에 관한 것으로, 보다 상세하게는 인너 바디와 아우터 바디를 구속하는 록킹부재의 형상을 핀타입으로 변경하여 록킹부재의 작동을 원활하게 실시하도록 한 가변 밸브 리프트 기구의 캠팔로어에 관한 것이다.The present invention relates to a variable valve lift mechanism installed in a vehicle engine, and more particularly, to change the shape of the locking member that constrains the inner body and the outer body to a pin type to smoothly operate the locking member. It relates to a cam follower of a variable valve lift mechanism to be implemented.

일반적으로 차량의 엔진은 구동조건에 따라 최적의 흡입 공기량과 흡입 속도가 상이하여 파트 로드(Part Load)의 저속 구간에서는 흡입 속도가 상승되어야 하며, 풀 로드(Full Load)의 조건에서는 공기 흡입량이 많아져야 한다.In general, the engine of a vehicle has different intake air speeds and optimum intake speeds depending on the driving conditions. Therefore, the intake speed should be increased in the low speed section of the part load. You must lose.

이러한 구동조건을 만족하기 위해서는 흡기쪽에 가변 밸브 리프트 기구가 적용되고 있는 바, 도 1에 도시한 바와 같이, 가변 밸브 리프트 기구는 하나의 밸브(1)에 캠축(2)에서는 3개의 캠(3)(4)(4')이 적용되고 있어 이러한 캠의 동작을 롤러 핑거 캠팔로어(Roller Finger Camfollower)(5)를 작동시켜 밸브를 동작시키게 된다.In order to satisfy such driving conditions, a variable valve lift mechanism is applied to the intake side. As shown in FIG. 1, the variable valve lift mechanism has one valve 1 and three cams 3 on the cam shaft 2. (4) (4 ') is applied to operate the valve by operating a roller finger cam follower (5).

종래 기술에 의한 캠팔로어는 도 2에 도시한 바와 같이, 캠샤프트에 구비된 3종류의 캠에 대응하기 위하여 밸브 리프트 양이 작은 로우 리프트 캠(Low Lift Cam)(3)과 접촉되는 롤러(6)는 인너 바디(7)와 일체로 형성되어 있고, 밸브 리프트 양이 큰 하이 리프트 캠(High Lift Cam)(4)(4')과 접촉되는 패드(8)(9)는 아우터 바디(10)와 일체로 형성되어 있다.As shown in FIG. 2, the cam follower according to the prior art has a roller 6 in contact with a low lift cam 3 having a small valve lift amount to correspond to three types of cams provided in the cam shaft. ) Is integrally formed with the inner body 7, and the pads 8 and 9 which are in contact with the high lift cam 4 and 4 ′ having a large valve lift amount are the outer body 10. It is formed integrally with.

이와 같이 구성되어 있는 종래 기술에 의한 캠팔로어(5)는 하이 밸브 리프트 양만큼 개방시키고자 하는 경우에는 밸브 래시 어저스터(valve lash adjuster)를 통해서 공급된 오일이 피스톤(11)을 밀어주게 되어 피스톤(11)과 일체로 형성되어 있는 록 플레이트(12)가 록 플레이트 바디(13)와 함께 이동되어 록 플레이트(12)는 인너 바디(7)와 아우터 바디(10) 사이에 맞물린 상태가 됨으로써 하이 리프트 캠(4)(4')에 의해 작동되는 아우터 바디(10)와 함께 인너 바디(7)가 작동되면서 밸브는 하이 리프트 양으로 작동된다.When the cam follower 5 according to the related art is configured to open the valve by the amount of the high valve lift, the oil supplied through the valve lash adjuster pushes the piston 11 to the piston. The lock plate 12 which is formed integrally with the 11 is moved together with the lock plate body 13 so that the lock plate 12 is engaged between the inner body 7 and the outer body 10 so as to be high lifted. The inner body 7 is actuated with the outer body 10 actuated by the cams 4 and 4 'while the valve is actuated in a high lift amount.

또한, 밸브가 로우 리프트의 양으로 변환되어 오일 공급이 중단되면, 록 플레이트(12)를 탄력지지하고 있던 리턴 스프링(14)에 의해 록 플레이트(12)가 본래의 위치로 복귀되면서 록 플레이트(12)에 의해 구속되어 있던 인너 바디(7)와 아우터 바디(10)가 분리되어 독립적으로 작동되는 것이다.In addition, when the valve is converted to the amount of low lift and the oil supply is stopped, the lock plate 12 is returned to its original position by the return spring 14 which was supporting the lock plate 12 and the lock plate 12 is returned. Inner body (7) and the outer body (10) were restrained by the is to operate independently.

그러나 종래 기술에 의한 가변 밸브 리프트 기구의 캠팔로어(5)는 록 플레이트(12)가 좌우측으로 돌출되는 플레이트 형상이기 때문에 조립 및 가공 공차에 의해 록 플레이트 바디(13)와 결합시 록 플레이트(12)의 양쪽 플레이트(12a)(12b)가 동시에 록킹되기 어렵다. 이처럼 록 플레이트(12)가 정상적으로 록킹되지 않고 양측 플레이트중에서 일측 플레이트가 먼저 록킹되면 캠으로부터 가해지는 힘이 먼저 록킹된 부위로 집중되면서 가변 밸브 리프트 기구의 작동이 원활하게 실시되지 않게 되거나, 힘의 크기에 따라 가변 밸브 리프트 기구가 파손되는 문제가 있다.However, since the cam follower 5 of the variable valve lift mechanism according to the related art has a plate shape in which the lock plate 12 protrudes from side to side, the lock plate 12 is combined with the lock plate body 13 by assembly and processing tolerances. Both plates 12a and 12b are difficult to lock at the same time. As such, when the lock plate 12 is not normally locked and one of the plates is locked first, the force applied from the cam is concentrated to the first locked portion, so that the operation of the variable valve lift mechanism is not smoothly performed, or the magnitude of the force. This causes a problem that the variable valve lift mechanism is broken.

이와 같은 문제점을 감안하여 안출한 본 발명의 목적은 가변 밸브 리프트 기구의 하이 리프트 변환시 캠팔로어의 인너 바디와 아우터 바디를 구속하는 록킹 동작의 불량으로 인한 응력집중을 방지하도록 한 가변 밸브 리프트 기구의 캠팔로어 를 제공함에 있다.The object of the present invention devised in view of the above problems is to prevent the stress concentration due to the failure of the locking operation to restrain the inner body and the outer body of the cam follower during the high lift conversion of the variable valve lift mechanism cam To provide followers.

상기의 목적을 달성하기 위한 본 발명은, 중앙에 롤러가 일체로 형성된 인너 바디와, 상면에 패드가 구비된 아우터 바디로 구성되고, 상기 아우터 바디의 일측에는 러스트 모션 스프링이 설치되며, 타측에는 오일통로가 형성된 가변 밸브 리프트 기구의 캠팔로어에 있어서, 상기 오일통로에 대하여 수직방향으로 리턴스프링에 의해 탄력지지되는 록 핀을 설치하되, 상기 록 핀의 일측에는 원주상에 오일통과홈이 다수 형성된 스프링 시트를 장착하고, 타단에는 스냅 링을 설치하여 상기 스프링 시트와 스냅 링 사이에 상기 리턴 스프링을 설치하여 구성한 것을 특징으로 한다.The present invention for achieving the above object is composed of an inner body with a roller integrally formed in the center, and an outer body provided with a pad on the upper surface, one side of the outer body is provided with a rust motion spring, the other side is oil In the cam follower of the variable valve lift mechanism having a passage, a lock pin that is elastically supported by a return spring in a vertical direction with respect to the oil passage is provided, wherein one side of the lock pin is provided with a plurality of oil passage grooves on the circumference of the spring. The seat is mounted, and a snap ring is installed at the other end to install the return spring between the spring seat and the snap ring.

상기 록 핀의 단부는 단면이 반원형으로 절취부를 형성하여 상기 아우터 바디와 인너 바디 사이에서 록 핀에 걸리는 압력을 감소하도록 구성된 것이 바람직하다.The end of the lock pin is preferably configured to reduce the pressure applied to the lock pin between the outer body and the inner body by forming a cut in a semicircular cross section.

이하, 상기한 바와 같은 본 발명의 바람직한 실시예를 첨부도면에 의거하여 보다 상세하게 설명한다.Hereinafter, preferred embodiments of the present invention as described above will be described in more detail with reference to the accompanying drawings.

첨부도면 도 4는 본 발명에 의한 가변밸브 리프트 기구의 캠팔로어의 사시도이고, 도 5 및 도 6은 본 발명에 의한 캠팔로어의 동작상태 단면도이다.4 is a perspective view of a cam follower of the variable valve lift mechanism according to the present invention, and FIGS. 5 and 6 are cross-sectional views of an operation state of the cam follower according to the present invention.

이에 도시한 바와 같이, 본 발명 실시예에 의한 캠팔로어(100)는 중앙에 롤러(112)가 일체로 형성된 인너 바디(110)와, 상면에 패드(122)(124)가 구비된 아우터 바디(120)로 구성되어 있다.As shown in the drawing, the cam follower 100 according to the embodiment of the present invention has an inner body 110 in which a roller 112 is integrally formed in the center, and an outer body having pads 122 and 124 formed on an upper surface thereof. 120).

상기 아우터 바디(120)의 일측에는 러스트 모션 스프링(130)이 설치되어 있고, 타측에는 오일통로(140)가 형성되어 있으며, 오일통로(140)에 대하여 수직방향으로 리턴스프링(150)에 의해 탄력지지되는 록 핀(lock pin)(160)이 설치되어 있다.One side of the outer body 120 is provided with a rust motion spring 130, the other side is formed with an oil passage 140, elasticity by the return spring 150 in a vertical direction with respect to the oil passage 140 A supported lock pin 160 is provided.

상기 록 핀(160)의 일측에는 원주상에 오일통과홈(172)이 다수 형성된 스프링 시트(170)가 장착되어 있고, 타단에는 스냅 링(180)이 설치되어 있으며, 상기 스프링 시트(170)와 스냅 링(180) 사이에 리턴 스프링(150)이 설치되어 있다.One side of the lock pin 160 is mounted with a spring sheet 170 formed with a plurality of oil passage grooves 172 on the circumference, the other end is provided with a snap ring 180, the spring sheet 170 and The return spring 150 is provided between the snap rings 180.

상기 록 핀(160)의 단부는 단면이 반원형으로 절취부(162)를 형성하여 아우터 바디(120)와 인너 바디(110) 사이에서 록 핀(160)에 걸리는 압력을 감소하도록 구성되어 있다.The end of the lock pin 160 is configured to reduce the pressure applied to the lock pin 160 between the outer body 120 and the inner body 110 by forming the cutout 162 in a semicircular cross section.

이와 같이 구성되어 있는 본 발명에 의한 캠팔로어의 작용을 설명한다.The operation of the cam follower according to the present invention configured as described above will be described.

밸브가 하이 밸브 리프트의 양만큼 구동되면 밸브 래시 어저스터(valve lash adjuster)를 통해 공급되는 엔진 오일은 스프링 시트(170)의 오일통과홈(172)을 통해 공급되면서 록 핀(160)을 인너 바디의 외측으로 밀어주게 되어 록 핀(160)의 절취부(162)가 인너 바디(110)와 아우터 바디(120) 사이에 위치되면서 인너 바디(110)와 아우터 바디(120)의 하중압력에 의해 인너 바디(110)와 아우터 바디(120)는 상호 구속된 상태로 동시에 움직이게 된다. 이때, 스프링 시트(170)는 고정된 상태이고 스냅 링(180)은 록 핀과 함께 이동되므로 스프링 시트(170)와 스냅 링(180) 사이에 개재된 리턴스프링(150)이 압축된 상태가 된다.When the valve is driven by the amount of the high valve lift, the engine oil supplied through the valve lash adjuster is supplied through the oil passage groove 172 of the spring seat 170 to move the lock pin 160 to the inner body. The cutout 162 of the lock pin 160 is positioned between the inner body 110 and the outer body 120 while being pushed to the outside of the inner surface by the load pressure of the inner body 110 and the outer body 120. The body 110 and the outer body 120 are moved at the same time in a constrained state. At this time, the spring seat 170 is fixed and the snap ring 180 is moved together with the lock pin, so that the return spring 150 interposed between the spring seat 170 and the snap ring 180 is compressed. .

로우 밸브 리프트 양이 적용되면, 엔진 오일이 배출되어 오일에 의한 압력이 제거되므로 리턴스프링(150)의 탄성복원력에 의해 록 핀(160)이 인너 바디(110)와 아우터 바디(120) 사이에서 이탈하여 본래의 위치로 복귀되어 록상태가 해제되므로 아우터 바디(120)와 인너 바디(110)는 독립적으로 동작되는 것이다.When the low valve lift amount is applied, the engine oil is discharged to remove the pressure caused by the oil, so that the lock pin 160 is separated between the inner body 110 and the outer body 120 by the elastic restoring force of the return spring 150. The outer body 120 and the inner body 110 are operated independently because the locked state is released to the original position.

이상에서 설명한 바와 같이, 본 발명에 의한 가변 밸브 리프트 기구의 캠팔로어는 가변 밸브 리프트 기구의 하이 리프트(High lift) 변환시 캠팔로어의 인너 바디와 아우터 바디를 구속하는 록킹 동작의 불량으로 인한 응력집중이 방지되고 캠 팔로어가 원활한 작동을 실시하게 되어 오일압력을 낮출 수 있어 마찰 저감 효과가 있다.As described above, the cam follower of the variable valve lift mechanism according to the present invention has a stress concentration due to a poor locking operation that restrains the inner body and the outer body of the cam follower during the high lift conversion of the variable valve lift mechanism. It is prevented and the cam follower operates smoothly, which can lower the oil pressure, thereby reducing friction.

아울러 록킹 부재에 응력이 집중되지 않게 되므로 캠팔로어의 파손을 방지하는 효과가 있다.In addition, since stress is not concentrated in the locking member, there is an effect of preventing damage to the cam follower.

Claims (2)

중앙에 롤러가 일체로 형성된 인너 바디와, 상면에 패드가 구비된 아우터 바디로 구성되고, 상기 아우터 바디의 일측에는 러스트 모션 스프링이 설치되며, 타측에는 오일통로가 형성된 가변 밸브 리프트 기구의 캠팔로어에 있어서,The inner body is formed integrally with a roller in the center, and the outer body having a pad on the upper surface, one side of the outer body is provided with a rust motion spring, the other side is formed on the cam follower of the variable valve lift mechanism formed with an oil passage In 상기 오일통로에 대하여 수직방향으로 리턴스프링에 의해 탄력지지되는 록 핀을 설치하되, 상기 록 핀의 일측에는 원주상에 오일통과홈이 다수 형성된 스프링 시트를 장착하고, 타단에는 스냅 링을 설치하여 상기 스프링 시트와 스냅 링 사이에 상기 리턴 스프링을 설치하여 구성한 것을 특징으로 하는 가변 밸브 리프트 기구의 캠팔로어.Install a lock pin elastically supported by the return spring in the vertical direction with respect to the oil passage, one side of the lock pin is equipped with a spring sheet formed with a plurality of oil passage grooves on the circumference, the other end by installing a snap ring A cam follower of a variable valve lift mechanism, wherein the return spring is provided between a spring seat and a snap ring. 제 1 항에 있어서,The method of claim 1, 상기 록 핀의 단부는 단면이 반원형으로 절취부를 형성하여 상기 아우터 바디와 인너 바디 사이에서 록 핀에 걸리는 압력을 감소하도록 구성된 것을 특징으로 하는 가변 밸브 리프트 기구의 캠팔로어.And the end of the lock pin is semicircular in cross section to reduce the pressure applied to the lock pin between the outer body and the inner body.
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