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

1993-09-15

1994-11-22

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9041, F01L 134

Patent

active

053658957

ABSTRACT:
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.

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: 5189997 (1993-03-01), Schneider
patent: 5205247 (1993-04-01), Hoffman

Affiliated with

Also associated with

Rating

Variable valve lift mechanism for internal combustion engine does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Variable valve lift mechanism for internal combustion engine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable valve lift mechanism for internal combustion engine will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1984418