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-

1991-03-25

1992-01-14

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, F01L 134

Patent

active

050800523

ABSTRACT:
A variable valve timing system includes 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, and 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. The damper device includes the first timing member, a ring-member engaged with the second timing member and a viscous fluid between the first timing member and the ring-member.

REFERENCES:
patent: 4601266 (1986-07-01), Oldfield et al.
patent: 4811698 (1989-03-01), Akasaka et al.
patent: 4841924 (1989-06-01), Hampton et al.
patent: 4856465 (1989-08-01), Denz et al.

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