Valve timing control device

Details Valve timing control device Valve timing control device

1995-02-08

1996-01-16

Yuen, Henry C.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, 74568R, 464 2, F01L 134

Patent

active

054839300

ABSTRACT:
In a valve timing control device, when a camshaft is retained relative to a timing pulley, a hydraulic piston is applied with a force which moves it in a direction toward an advancing-side hydraulic chamber (i.e., in the direction to vary a valve timing to a delaying side) owing to reaction of the driving torque of the camshaft. This force causes fluid to leak out of the advancing-side hydraulic chamber, and the hydraulic piston is liable to move toward this hydraulic chamber. However, fluid of an amount corresponding to an amount of this leakage is supplied to the advancing-side hydraulic chamber by way of a control valve. Also, discharge of fluid from a delaying-side hydraulic chamber via the control valve is stopped. Thus, the movement of the hydraulic piston toward the advancing-side hydraulic chamber when the hydraulic piston is retained at a desired position is prevented. Therefore, the hydraulic piston can be stably retained at the desired position, and a desired valve timing can be maintained.

REFERENCES:
patent: 4934348 (1990-06-01), Yagi et al.
patent: 5012773 (1991-05-01), Akasaki et al.
patent: 5012774 (1991-05-01), Strauber et al.
patent: 5088456 (1992-02-01), Suga
patent: 5170756 (1992-12-01), Szodfridt
patent: 5243935 (1993-09-01), Kano et al.
patent: 5301639 (1994-04-01), Satou
patent: 5435782 (1995-07-01), Tortul

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