Valve timing control system of internal combustion engine

Details Valve timing control system of internal combustion engine Valve timing control system of internal combustion engine

1992-04-28

1993-07-20

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, 464 2, 74568R, F01L 134

Patent

active

052284174

ABSTRACT:
A valve timing control system includes of a cylindrical sprocket driven through a timing chain by a crankshaft of the engine. An arm is fixed to one end section of the camshaft and located inside the sprocket in a manner to extend generally diametrically. First and second plungers are slidably disposed respectively in first and second cylindrical bores formed in the sprocket. A hydraulic pressure chamber is defined between the bottom portion of each plunger and the bottom wall of the cylindrical bore so as to be supplied with a hydraulic pressure from a hydraulic pressure source. Each plunger is projectable toward the arm upon supply of the hydraulic pressure to the corresponding hydraulic pressure chamber thereby to cause the arm to rotate relative to the sprocket. Projections of the first and second plungers induce the rotational movements of the arm in opposite directions relative to the sprocket, respectively. The rotational movements of the arm cause the camshaft to undergo relative rotation which advances or retards the valve timing of the intake and/or exhaust valves.

REFERENCES:
patent: 4231330 (1980-11-01), Garcea
patent: 5117785 (1992-06-01), Suga et al.
patent: 5129370 (1992-07-01), Suga et al.

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