Variable valve timing mechanism of engine

Details Variable valve timing mechanism of engine Variable valve timing mechanism of engine

1997-02-26

1997-12-30

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, F01L 1344

Patent

active

057018588

ABSTRACT:
A variable valve timing control device includes a camshaft for actuating an intake valve, and an inner gear is provided with the distal end of the camshaft. A sprocket having a first surface and a second surface surrounds the inner gear. A ring gear is placed between the camshaft and the sprocket. A cover is fixed to the inner gear, and the cover defines a first hydraulic pressure chamber between it and the inner gear. A flange is provided with the inner gear, and the cover defines a second hydraulic pressure chamber. A first clearance is defined between the first surface and the cover and communicates with the first hydraulic pressure chamber. A second clearance is defined between the second surface and the flange and communicates with the second hydraulic pressure chamber. An intermediate surface is provided on the sprocket, facing a direction opposite to that faced by the second surface in the second hydraulic pressure chamber. The intermediate surface has an area greater than that of the second surface.

REFERENCES:
patent: 5301639 (1994-04-01), Satou
patent: 5483930 (1996-01-01), Moriya et al.
patent: 5592909 (1997-01-01), Tsuruta
patent: 5592910 (1997-01-01), Suga et al.

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