Variable valve timing system

Details Variable valve timing system Variable valve timing system

1994-01-28

1995-01-03

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, F01L 134

Patent

active

053776399

ABSTRACT:
A variable valve timing system in an engine having a rotating cam-shaft includes an input pulley driven by the engine, a piston engaged with the input pulley so as to be displaceable in angular direction relative thereto, a cup-shaped casing mounted on the piston so as to be displaceable in angular direction relative thereto and connected to the cam-shaft, a cup-shaped cover accommodating therein the cup-shaped casing with a clearance and connected to the input pulley, a damper containing an amount of viscous fluid disposed in the clearance, a first sealing member disposed at one end of the clearnace, and a second sealing member disposed at the other end of the clearance, and having a characteristic in that a fluid-tight function between the cup-shaped cover and the cup-shaped casing becomes less as a centrifugal force increases.

REFERENCES:
patent: 5067450 (1991-11-01), Kano et al.
patent: 5080052 (1992-01-01), Hotta et al.
patent: 5090365 (1992-02-01), Hotta et al.
patent: 5205248 (1993-04-01), Hara et al.

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