KR20030025331A - Valve timing apparatus - Google Patents

Valve timing apparatus Download PDF

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Publication number
KR20030025331A
KR20030025331A KR1020010058158A KR20010058158A KR20030025331A KR 20030025331 A KR20030025331 A KR 20030025331A KR 1020010058158 A KR1020010058158 A KR 1020010058158A KR 20010058158 A KR20010058158 A KR 20010058158A KR 20030025331 A KR20030025331 A KR 20030025331A
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KR
South Korea
Prior art keywords
pulley
space
crankshaft
hydraulic
oil
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Application number
KR1020010058158A
Other languages
Korean (ko)
Inventor
천우진
Original Assignee
현대자동차주식회사
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Application filed by 현대자동차주식회사 filed Critical 현대자동차주식회사
Priority to KR1020010058158A priority Critical patent/KR20030025331A/en
Publication of KR20030025331A publication Critical patent/KR20030025331A/en

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Classifications

    • 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
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
    • F02B67/04—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus
    • F02B67/06—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus driven by means of chains, belts, or like endless members
    • 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
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
    • F01L2001/34423—Details relating to the hydraulic feeding circuit
    • F01L2001/34426—Oil control valves
    • 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
    • F01L2201/00—Electronic control systems; Apparatus or methods therefor
    • 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
    • F01L2250/00—Camshaft drives characterised by their transmission means
    • F01L2250/04—Camshaft drives characterised by their transmission means the camshaft being driven by belts

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

PURPOSE: A valve timing apparatus is provided to delay a valve timing when an engine is operated at a low speed and to rapidly achieve the valve timing when the engine is operated at a high speed by installing a variable valve timing in the valve timing apparatus. CONSTITUTION: A crank shaft pulley(1) is indirectly connected to a crank shaft(2) through a hydraulic circuit pulley(3) fixed to the crank shaft(2). The crank shaft pulley(1) is meshed with the hydraulic circuit pulley(3) such that the crank shaft pulley(1) and the hydraulic circuit pulley(3) are relatively moved with respect to each other. A fan shaped space(4) is formed at an inner portion of the crank shaft pulley(1). The fan shaped space(4) is divided into a hydraulic pressure space and an empty space by mans of a partition member. A compression spring is installed in the empty space so as to push the partition member towards the hydraulic pressure space.

Description

가변식 밸브타이밍을 가지는 밸브타이밍 장치{Valve timing apparatus}Valve timing apparatus with variable valve timing

본 발명은 가변식 밸브타이밍을 가지는 타이밍 벨트장치에 관한 것이다.The present invention relates to a timing belt device having a variable valve timing.

밸브기구는 각 실린더의 흡입밸브와 배기밸브를 점화순서대로 설계된 시기에 개폐 작용을 하는 기구로서, 통상 캠축 구동장치에 의해 구동되는데 4사이클 엔진의 캠축은 크랭크축 회전수의 1/2로 회전하며, 또한 크랭크축의 회전에 대해서 각 밸브의 개폐시기가 밸브 타이밍에 맞도록 해야한다.The valve mechanism is a mechanism that opens and closes the intake valve and exhaust valve of each cylinder in the order of ignition order, and is normally driven by a camshaft driving device. In addition, when the crankshaft rotates, the opening and closing timing of each valve should be matched to the valve timing.

그런데 밸브의 개폐 시기는 캠축에 의해 설정되는 밸브타이밍에 의하게 되는데 일반적으로 엔진의 회전 rpm이 높을수록 밸브타이밍을 앞당겨주는 것이 유리한 것으로 알려져 있다.By the way, the opening and closing time of the valve is due to the valve timing set by the camshaft. In general, it is known that it is advantageous to advance the valve timing as the engine rpm is higher.

그러나 도 3에 도시하는 것과 같이 종래의 타이밍 벨트장치의 경우 캠축풀리(20)가 크랭크축풀리(21)와 타이밍벨트(22)로 연결되어 타이밍이 넘어가는 것이 방지되도록 되어 있어, 타이밍 벨트장치 자체로서는 엔진의 운전조건에 따라 밸브 개폐를 위한 타이밍의 조정이 곤란하다는 문제가 있다.However, in the conventional timing belt apparatus as shown in FIG. 3, the camshaft pulley 20 is connected to the crankshaft pulley 21 and the timing belt 22 so that the timing is prevented from being crossed, and the timing belt apparatus itself. As a problem, it is difficult to adjust the timing for opening and closing the valve in accordance with the engine operating conditions.

이에 본 발명은 상기한 점을 감안하여 제안한 것으로서 그의 목적으로 하는 것은 엔진이 저속으로 구동될 때는 밸브타이밍을 늦추고 엔진이 고속으로 운전되면 밸브타이밍을 진각시키게 되는 가변식밸브 타이밍을 갖는 타이밍 벨트장치를 제공하는데 있다.Accordingly, the present invention has been proposed in view of the above, and its object is to provide a timing belt apparatus having a variable valve timing that delays valve timing when the engine is driven at a low speed and advances valve timing when the engine is operated at a high speed. To provide.

상기한 목적을 달성하기 위하여 본 발명은 크랭크축에 장착되는 크랭크축 풀리와, 캠축구동용 풀리 및 풀리 구동을 위한 타이밍 벨트를 포함하는 타이밍 벨트 구동장치에 있어서,In order to achieve the above object, the present invention provides a crankshaft pulley mounted on a crankshaft, a camshaft driving pulley and a timing belt driving apparatus including a timing belt for driving a pulley,

상기 크랭크축 풀리는 동심으로 상대 운동이 가능하게 계합되는 유압회로 풀리를 개재하여 크랭크축에 접속되며, 상기 유압회로 풀리의 외주 일부에 접하도록 크랭크축 풀리내에 형성되는 부채꼴 형상의 공간과, 상기 부채꼴 형상의 공간을 유압작용 공간과 빈공간으로 구획하도록 상기 유압 회로 풀리로부터 상기 공간내로 방사상으로 돌출연장하는 차단벽부재와,The crankshaft pulley is connected to the crankshaft via a hydraulic circuit pulley conjoined to allow relative movement concentrically, and a fan-shaped space formed in the crankshaft pulley so as to contact a part of the outer circumference of the hydraulic circuit pulley, and the fan-shaped shape. A blocking wall member radially protruding from the hydraulic circuit pulley into the space so as to divide the space into a hydraulic action space and an empty space;

상기 차단벽부재에 의해 구획된 일측 빈공간내에 상기 차단벽 부재를 유압 작용 공간으로 이동하도록 탄발하는 압축스프링과;A compression spring configured to move the barrier wall member to a hydraulically actuated space in one empty space partitioned by the barrier wall member;

상기 유압회로 풀리를 통해 상기 유압 작용공간에 연통하도록 형성하는 오일공급통로와,An oil supply passage formed to communicate with the hydraulic working space through the hydraulic circuit pulley;

상기 오일공급통로를 통해 오일을 공급하는 유압펌프와;A hydraulic pump for supplying oil through the oil supply passage;

상기 오일공급통로의 도중에 설치되어 엔진의 운전 속도에 비례하여 오일공급량을 절환하는 밸브;를 포함하여 구성되는 것을 특징으로 한다.And a valve installed in the middle of the oil supply passage to switch the oil supply amount in proportion to the operation speed of the engine.

도 1은 본 발명에 의한 가변식 밸브타이밍을 가지는 밸브타이밍 장치의 요부구성도1 is a main configuration diagram of a valve timing device having a variable valve timing according to the present invention;

도 2는 도 1의 A-A 단면도를 포함한 전체 시스템을 도시한 도면FIG. 2 shows the entire system, including the A-A cross section of FIG.

도 3은 종래기술3 is a prior art

※ 도면의 주요 부분에 대한 부호의 설명※ Explanation of codes for main parts of drawing

1 : 크랭크축 풀리 2 : 크랭크축1: crankshaft pulley 2: crankshaft

3 : 유압회로 풀리 4 : 공간3: hydraulic circuit pulley 4: space

4a : 유압작용공간 4b : 빈공간4a: Hydraulic action space 4b: Empty space

5 : 차단벽부재 6 : 압축스프링5: blocking wall member 6: compression spring

7 : 오일공급통로 8 : 유압펌프7: Oil supply passage 8: Hydraulic pump

9 : 밸브 10 : 액츄에이터9: valve 10: actuator

11 : 전자제어장치 12 : 오일통로11: electronic control unit 12: oil passage

13 : 속도센서 14 : 오일탱크13 speed sensor 14 oil tank

이하 본 발명의 구성을 첨부한 도면을 참조하여 설명한다.Hereinafter, the configuration of the present invention will be described with reference to the accompanying drawings.

도 1은 본 발명에 의한 가변식 밸브 타이밍을 가지는 타이밍 벨트장치의 요부구성도이며, 도 2는 동상 타이밍 벨트장치의 A-A 단면도를 포함한 전체 시스템을 도시한 도면으로 도면중 부호 1은 크랭크축풀리이다.1 is a main configuration diagram of a timing belt device having a variable valve timing according to the present invention, and FIG. 2 is a view showing the entire system including the AA cross-sectional view of the in-phase timing belt device, wherein 1 is a crankshaft pulley. .

크랭크축풀리(1)는 크랭크축(2)에 직접 고정장착되지 않고 크랭크축(2)에 고정된 유압회로풀리(3)를 개재하여 장착되어 있다.The crankshaft pulley 1 is mounted via the hydraulic circuit pulley 3 fixed to the crankshaft 2 without being directly fixed to the crankshaft 2.

그리고 유압회로 풀리(3)와 크랭크축 풀리(1)는 서로 상대 운동이 가능하게계합되며, 유압회로풀리(3)의 외주에 접한 크랭크축풀리(1)의 내측 일부에는 부채꼴 형상의 공간(4)이 형성되어 있다.The hydraulic circuit pulley 3 and the crankshaft pulley 1 are engaged with each other so that relative movement is possible, and a fan-shaped space 4 is formed in the inner part of the crankshaft pulley 1 in contact with the outer circumference of the hydraulic circuit pulley 3. ) Is formed.

또 상기 공간(4)은 유압회로 풀리(3)로부터 방사상으로 돌출 연장된 차단벽부재(5)에 의해 유압작용공간(4a)과 빈공간(4b)으로 구획되어 있다.The space 4 is divided into a hydraulic pressure working space 4a and an empty space 4b by a blocking wall member 5 protruding radially from the hydraulic circuit pulley 3.

그리고 상기 빈공간(4b)내에는 상기 차단벽부재(5)를 유압작용공간(4a)쪽으로 미는 힘을 가하는 압축스프링(6)이 설치되어 있다.In the empty space 4b, a compression spring 6 for applying a force pushing the barrier wall member 5 toward the hydraulic action space 4a is provided.

또 상기 유압회로 풀리(3)의 중심을 통해 상기 유압작용공간(4a)에 연통하는 오일공급통로(7)가 형성되어 있으며, 그 오일공급통로(7)의 단부에는 유압펌프(8)가 접속되고, 오일공급통로(7)의 도중에는 펌핑되는 오일공급 방향을 절환하는 밸브(9)가 설치되어 있다.In addition, an oil supply passage 7 is formed in communication with the hydraulic action space 4a through the center of the hydraulic circuit pulley 3, and an hydraulic pump 8 is connected to an end of the oil supply passage 7. In the middle of the oil supply passage 7, a valve 9 for switching the pumped oil supply direction is provided.

또 상기 공간(4)과 압축스프링(6) 및 차단벽부재(5)는 복수개가 형성된다.In addition, a plurality of the space 4, the compression spring 6 and the blocking wall member 5 is formed.

이 밸브(9)는 액츄에이터(10)는 전자제어장치(11)에 의해 작동이 제어된다.The valve 9 of the actuator 10 is controlled by the electronic control device 11 operation.

한편, 상기 오일공급통로(7)는 크랭크축풀리(1)의 밖으로 연장되는 것으로 도시 및 설명하였으나 사실은 크랭크축(2)의 윤활을 위해 크랭크축에 형성된 오일통로(12, 점선도시)에 연통하도록 구성할 수 있으며, 유압펌프(8) 역시 별도로 구비할 수 있으나 엔진의 윤활을 위한 오일펌프를 겸용하는 것이 바람직하다.On the other hand, the oil supply passage (7) is shown and described as extending out of the crankshaft pulley (1), but in fact communicating with the oil passage (12, dotted line) formed on the crankshaft for lubrication of the crankshaft (2) It can be configured to, and the hydraulic pump 8 may also be provided separately, but it is preferable to use an oil pump for lubrication of the engine.

이와같은 본 발명의 작동에 대하여 설명하면 다음과 같다.Referring to the operation of the present invention as follows.

엔진이 저속으로 구동될 때는 속도센서(13)로부터의 신호에 의해 전자제어장치(11)는 유압펌프(8)를 오프시킨 후 액츄에이터(10)를 구동하여 밸브(9)를 A부로 절환시키므로써 유압작용공간(4a)이 오일탱크(14)에 접속되어 압력스프링(6)의 신장에 의해 차단벽부재(5)를 유압작용공간(4a)을 축소시키는 방향으로 이동시키게 된다.When the engine is driven at a low speed, the electronic controller 11 turns off the hydraulic pump 8 by the signal from the speed sensor 13, and then drives the actuator 10 to switch the valve 9 to the A part. The hydraulic action space 4a is connected to the oil tank 14 to move the blocking wall member 5 in the direction of reducing the hydraulic action space 4a by the extension of the pressure spring 6.

이에따라 유압회로풀리(3)가 크랭크축풀리(1)에 대해 반시계 방향으로 움직이게 되므로써 밸브 타이밍이 늦어지게 된다.As a result, the valve timing is delayed because the hydraulic circuit pulley 3 moves counterclockwise with respect to the crankshaft pulley 1.

그러나 엔진이 고속으로 운전되면 전자제어장치(11)는 액츄에이터(10)를 구동제어하여 밸브(9)를 C부로 절환하고 유압펌프(8)를 구동하므로써 유압펌프(8)로부터 급송되는 오일이 유압작용공간(4a)내로 공급되어 차단막부재(5)로 하여금 압축스프링(6)을 압축하면서 시계방향으로 회전시키게 되어 밸브타이밍이 크랭크축(2)의 회전보다 조금 앞서 형성되게 되는 것이다.However, when the engine is driven at a high speed, the electronic control device 11 drives the actuator 10 to control the valve 9 to the C part and drives the hydraulic pump 8 so that the oil supplied from the hydraulic pump 8 is hydraulic. It is supplied into the working space 4a to cause the blocking membrane member 5 to rotate in the clockwise direction while compressing the compression spring 6 so that the valve timing is formed slightly ahead of the rotation of the crankshaft 2.

이상과 같은 본 발명은 엔진의 저속 구동시에는 밸브타이밍을 늦추고 엔진의 고속 구동시에는 밸브타이밍을 진각시키게 되므로서 엔진 구동속도에 따라 최적의 밸브 개폐가 가능하여 연비와 동력 성능 및 배기가스의 정화 향상 효과가 있다.In the present invention as described above, the valve timing is slowed down at the low speed of the engine and the valve timing is advanced at the high speed of the engine, so that the optimum valve opening and closing is possible according to the engine driving speed, thereby purifying fuel efficiency, power performance, and exhaust gas. There is an improvement effect.

Claims (6)

크랭크축에 장착되는 크랭크축 풀리와, 캠축구동용 풀리 및 풀리 구동을 위한 타이밍 벨트를 포함하는 타이밍 벨트 구동장치에 있어서,A timing belt drive device comprising a crankshaft pulley mounted to a crankshaft, a camshaft driving pulley and a timing belt for driving a pulley, 상기 크랭크축 풀리는 동심으로 상대 운동이 가능하게 계합되는 유압회로 풀리를 개재하여 크랭크축에 접속되며, 상기 유압회로 풀리의 외주 일부에 접하도록 크랭크축 풀리내에 형성되는 부채꼴 형상의 공간과, 상기 부채꼴 형상의 공간을 유압작용 공간과 빈공간으로 구획하도록 상기 유압 회로 풀리로부터 상기 공간내로 방사상으로 돌출연장하는 차단벽부재와,The crankshaft pulley is connected to the crankshaft via a hydraulic circuit pulley conjoined to allow relative movement concentrically, and a fan-shaped space formed in the crankshaft pulley so as to contact a portion of the outer circumference of the hydraulic circuit pulley, and the fan-shaped shape. A blocking wall member radially protruding from the hydraulic circuit pulley into the space so as to divide the space into a hydraulic action space and an empty space; 상기 차단벽부재에 의해 구획된 일측 빈공간내에 상기 차단벽 부재를 유압 작용 공간으로 이동하도록 탄발하는 압축스프링과;A compression spring configured to move the barrier wall member into a hydraulically actuated space in one empty space partitioned by the barrier wall member; 상기 유압회로 풀리를 통해 상기 유압 작용공간에 연통하도록 형성하는 오일공급통로와,An oil supply passage formed to communicate with the hydraulic working space through the hydraulic circuit pulley; 상기 오일공급통로를 통해 오일을 공급하는 유압펌프와;A hydraulic pump for supplying oil through the oil supply passage; 상기 오일공급통로의 도중에 설치되어 엔진의 운전 속도에 비례하여 오일공급량을 절환하는 밸브;를 포함하여 구성되는 것을 특징으로 하는 가변식 밸브 타이밍을 가지는 타이밍 벨트장치.And a valve installed in the middle of the oil supply passage to switch the oil supply amount in proportion to the operating speed of the engine. 제 1 항에 있어서,The method of claim 1, 엔진의 저속 운전시에는 상기 밸브는 전자제어장치에 의해 상기 유압 작용공간을오일탱크에 연통하도록 절환 제어되며, 엔진의 고속 운전시에는 유압펌프로부터 상기 유압 작용 공간에 오일이 공급되도록 유로를 절환하는 것을 특징으로 하는 가변식 밸브 타이밍을 가지는 타이밍 벨트장치.In the low speed operation of the engine, the valve is controlled to switch the hydraulic action space to the oil tank by an electronic control device, and during the high speed operation of the engine, the valve is switched to supply oil to the hydraulic action space from the hydraulic pump. A timing belt device having a variable valve timing. 제 2 항에 있어서,The method of claim 2, 상기 전자제어장치는 속도센서로부터 검출되는 차속 정보에 의해 상기 밸브와 유압펌프를 구동제어하는 것을 특징으로 하는 가변식 밸브 타이밍을 가지는 타이밍 벨트장치.The electronic control apparatus is a timing belt device having a variable valve timing, characterized in that for driving control of the valve and the hydraulic pump by the vehicle speed information detected from the speed sensor. 제 3 항에 있어서,The method of claim 3, wherein 상기 유압펌프는 엔진의 윤활을 위해 오일을 펌핑하는 오일펌프를 겸용하는 것을 특징으로 하는 가변식 밸브 타이밍을 가지는 타이밍 벨트장치.The hydraulic pump is a timing belt device having a variable valve timing, characterized in that also serves as an oil pump for pumping oil for lubrication of the engine. 제 1 항에 있어서,The method of claim 1, 상기 부채꼴 형상의 공간과 차단벽부재 및 압축스프링의 구성은 복수개가 설치되는 것을 특징으로 하는 가변식 밸브 타이밍을 가지는 타이밍 벨트장치.And a plurality of configurations of the fan-shaped space, the barrier wall member and the compression spring are provided. 제 1 항에 있어서,The method of claim 1, 상기 오일공급통로는 크랭크축의 윤활을 위해 크랭크축에 형성된 오일통로에 연통하는 것을 특징으로 하는 가변식 밸브 타이밍을 가지는 타이밍 벨트장치.And the oil supply passage communicates with an oil passage formed on the crankshaft for lubrication of the crankshaft.
KR1020010058158A 2001-09-20 2001-09-20 Valve timing apparatus KR20030025331A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR960023610A (en) * 1994-12-28 1996-07-20 전성원 Variable valve timing device using chain sprocket
KR19980046117A (en) * 1996-12-11 1998-09-15 박병재 Variable Valve Timing Scheme for Multistage Phase Angle Conversion
JPH11141313A (en) * 1997-11-07 1999-05-25 Toyota Motor Corp Valve timing varying device for internal combustion engine
KR19990063114A (en) * 1997-12-17 1999-07-26 히드라우릭 링 게엠베하 Hydraulic rotation angle adjuster of shaft to drive wheel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR960023610A (en) * 1994-12-28 1996-07-20 전성원 Variable valve timing device using chain sprocket
KR19980046117A (en) * 1996-12-11 1998-09-15 박병재 Variable Valve Timing Scheme for Multistage Phase Angle Conversion
JPH11141313A (en) * 1997-11-07 1999-05-25 Toyota Motor Corp Valve timing varying device for internal combustion engine
KR19990063114A (en) * 1997-12-17 1999-07-26 히드라우릭 링 게엠베하 Hydraulic rotation angle adjuster of shaft to drive wheel

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