Valve timing mechanism with eccentric bushing on rocker shaft

Details Valve timing mechanism with eccentric bushing on rocker shaft Valve timing mechanism with eccentric bushing on rocker shaft

1990-06-29

1991-05-28

Okonsky, David A.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9015, F01L 134

Patent

active

050184873

ABSTRACT:
A valve moving mechanism for a four-cycle engine of a vehicle is operatively connected to a crank shaft of the engine and is adapted to move intake and exhaust valves. A cam shaft of the valve moving mechanism is operatively connected to the crank shaft and cam means including first, second and third cams is mounted upon the cam shaft, the second and third cams having outer profiles different from that of the first cam disposed between the second and third cams. Rocker arm means are mounted so as to be rotatable upon the rocker shaft which is rotatably mounted and includes first, second and third rocker arms driven in engagement with the first, second and third cams, respectively. The rocker arm means is operatively connected to the intake and exhaust valves, the first, second and third rocker arms having supporting bases mounted upon the rocker shaft. Bush means are mounted upon the rocker shaft so as to be selectively in engagement with the first, second and third rocker arms and has an axis eccentric with respect to the axis of the rocker shaft.

REFERENCES:
patent: 3641988 (1972-02-01), Torazza et al.
patent: 4397270 (1983-08-01), Aoyama
patent: 4438736 (1984-03-01), Hara et al.
patent: 4503818 (1985-03-01), Hara et al.
patent: 4506635 (1985-03-01), van Rinsum
patent: 4526142 (1985-07-01), Hara et al.
patent: 4643141 (1987-02-01), Bledsoe
patent: 4724822 (1988-02-01), Bonvallet
patent: 4768475 (1988-09-01), Ikemura

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