Variable valve timing system in an engine having a rotating cam-

Details Variable valve timing system in an engine having a rotating cam- Variable valve timing system in an engine having a rotating cam-

1991-03-15

1992-02-25

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, 464 2, F01L 134

Patent

active

050903659

ABSTRACT:
A variable valve timing system comprises a first timing member driven by the engine, a second timing member rotatably fixed to the crankshaft, a helical device engaged between the first and second timing members and including a piston movable for adjusting an angular position between the first and second timing members, a hydraulic circuit device for selectively applying a hydraulic pressure to the piston for selectively moving the piston to adjust the angular position, a damper device on the first and second timing members for hydraulically damping rotational vibrations between the first timing member and the second timing member, and a notch formed at least on one of the first timing member and the second timing member in the damper device. Torque variations applied to the second timing member relative so the first timing member do not cause a change in the angular position.

REFERENCES:
patent: 4787345 (1988-11-01), Thoma
patent: 4841924 (1989-06-01), Hampton et al.
patent: 5012774 (1991-05-01), Strauber et al.

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