[특허]Variable valve lift mechanism for internal combustion engine

Variable valve lift mechanism for internal combustion engine 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F01L-001/34
출원번호	US-0122223 (1993-09-15)
발명자 / 주소	Riley Michael B. (Fort Collins CO)
출원인 / 주소	Motive Holdings Limited (Tortola VGX 03)
인용정보	피인용 횟수 : 24 인용 특허 : 0

초록 ▼

Variable valve lift in an engine is achieved by varying the location of the pivot of the rocker arm or finger follower. The pivot shaft and rocker arm or finger follower have engaging teeth that mate. The pivot shaft rolls across a stationary rack of teeth to change the ratio of valve lift to cam lift, while, for a given position of the pivot shaft, preventing the pivot shaft from rotating. The pivot shaft rides in a bearing block whose movement is constrained by a bearing guide of the same shape as the stationary rack. The shape of the toothed rack on the rocker arm or finger follower is part of a circular cylinder whose radius is determined by the position and angles of the cam and valve. The shape of the stationary rack and bearing guide may vary from that of the rocker arm to allow for altered adjustment clearance with different valve lifts. The relationship between adjustment clearance and pivot shaft position yields controlled variation of phase and duration. At full lift the clearance would be within usual limits, while at partial lift reduced contact velocities allow greater clearance without increasing idle noise, and thus opening of valves may be delayed, and closing advanced.

대표청구항 ▼

An apparatus for varying the extent of opening of an internal combustion engine valve responsive to a cam on a camshaft, comprising: a rocker arm having a body with a rack of teeth, a cam follower in contact with said cam, and an actuator to open said valve; and a pivot shaft having a set of rocker arm-engaging teeth mating with the rocker arm body rack of teeth whereby the rocker arm rocks on said pivot shaft to open and close the valve as the cam follower is moved by the cam, the position of the pivot shaft being adjustable as the pivot shaft set of rocker arm-engaging teeth are engaged with the rocker arm body rack of teeth to adjust the rocking of the rocker arm body and thereby adjust the extent of opening of the valve; wherein there is a valve clearance space between the valve and the actuator which is varied by the rolling of the pivot shaft, and wherein the opening and closing of the valve are timed by the rocking of the rocker arm, the opening and closing of the valve being timed at a first timing when the pivot shaft is at a first position on the rocker arm and being timed at a second timing different from the first timing when the pivot shaft is at a second position on the rocker arm different from the first position. An apparatus for varying the extent of opening of an internal combustion engine valve responsive to a cam on a camshaft, comprising: a rocker arm having a body with a rack of teeth, a cam follower in contact with said cam, and an actuator to open said valve; a pivot shaft having a set of rocker arm-engaging teeth mating with the rocker arm body rack of teeth whereby the rocker arm rocks on said pivot shaft to open and close the valve as the cam follower is moved by the cam; a stationary rack of teeth and wherein the pivot shaft includes a set of teeth to engage the stationary rack, the pivot shaft being rollable along the stationary rack of teeth; a pivot shaft guide to which the pivot shaft is rotatably attached, the position of the pivot shaft guide being adjustable to adjustably roll the pivot shaft; wherein the pivot shaft guide includes a guide mount and a block engaged with the pivot arm and slidably mounted on the mount whereby the sliding of the block on the mount rolls the pivot shaft; the position of the pivot shaft being adjustable as the pivot shaft set of rocker arm-engaging teeth are engaged with the rocker arm body rack of teeth to adjust the rocking of the rocker arm body and thereby adjust the extent of opening of the valve.

이 특허를 인용한 특허 (24)

Weber,James R.; Leman,Scott A.; Coleman,Gerald N.; Duffy,Kevin P.; Fluga,Eric C.; Kilkenny,Jonathan P.; Afjeh,Homa, Air and fuel supply system for a combustion engine.
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Weber,James R.; Leman,Scott A.; Coleman,Gerald N.; Duffy,Kevin P.; Fluga,Eric C.; Kilkenny,Jonathan P., Combustion engine including cam phase-shifting.
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Bulicz,Tytus R.; Gui,Xinqun; de Ojeda,William, Variable compression ratio strategy for improving combustion processes in alternative combustion compression ignition engines.
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Roth, David B., Variable lift and duration device for poppet valves.
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Gustafson Richard J. (Columbus IN) Morris Corydon E. (Columbus IN), Variable timing cam follower lever assembly.
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Xiong, Zhijiang; Zhao, Hui, Variable valve lift system for an internal combustion engine.
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Rotter, Terrence M.; Bruso, Kevin C.; Lewis, Steven P., Variable valve timing apparatus and internal combustion engine incorporating the same.
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Riley, Michael B., Varying the phase and lift of a rocker arm on a camshaft actuating a valve or injector.
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Riley, Michael B., Varying the phase and lift of a rocker arm on a camshaft actuating a valve or injector.
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Riley, Michael B., Varying the phase and lift of a rocker arm on a camshaft actuating a valve or injector.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
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저장형식	Text(ASCII format) Excel format PIAS분석(.xls)
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연합인증

Variable valve lift mechanism for internal combustion engine 원문보기

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이 특허를 인용한 특허 (24)

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Variable valve lift mechanism for internal combustion engine 원문보기

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연구과제 타임라인

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이 특허를 인용한 특허 (24)

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