Variable valve lift mechanism for internal combustion engine

Details Variable valve lift mechanism for internal combustion engine Variable valve lift mechanism for internal combustion engine

1994-05-19

1995-10-10

Yuen, Henry C.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9041, 123 9045, F01L 134

Patent

active

054562244

ABSTRACT:
Variable valve lift in an engine is achieved by varying the location of the pivot of the rocker arm or finger follower as stated in an earlier patent application. The path of contact between the rocker arm or finger follower and the pivot may be circular or non-circular. 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. Deactivation of valves can occur with reduced lift and a suitably increased adjustment clearance, while maintaining adequately low contact velocities. With individual control of valves, one or more cylinders may be deactivated, or by varying lift independently on multi-valve engines, mixing of incoming gases may be enhanced.

REFERENCES:
patent: 4721007 (1988-01-01), Entzminger
patent: 4986227 (1991-01-01), Dewey, III
patent: 5107802 (1992-04-01), Yagi et al.
patent: 5111781 (1992-05-01), Kaku et al.
patent: 5119773 (1992-06-01), Schon et al.
patent: 5148783 (1992-09-01), Shinkai et al.
patent: 5189997 (1993-03-01), Schneider
patent: 5205247 (1993-04-01), Hoffman
patent: 5365895 (1994-11-01), Riley

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