Engine variable valve timing mechanism

Details Engine variable valve timing mechanism Engine variable valve timing mechanism

1997-04-07

1998-03-10

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, F01L 1344

Patent

active

057249296

ABSTRACT:
A variable valve timing mechanism is provided at the distal end of a camshaft for changing a valve timing of an engine valve. A rotor is fixed to the distal end face of the camshaft, and the rotor has four vanes protruding radially outward. A housing is disposed to surround the rotor to be rotatable relative to the rotor and the camshaft, and the housing has recesses on the inner circumference. Each recess is divided by the vane into a first pressure chamber and a second pressure chamber. A first passage is defined in the camshaft, for supplying a hydraulic fluid pressure to the first pressure chamber so as to change the rotational phase of the second rotor with respect to the camshaft, and the first passage has an opening at the distal end face of the camshaft. A second passage is defined in the camshaft, for supplying a fluid pressure to the second pressure chamber so as to change the rotational phase of the second rotor with respect to the camshaft, and the second passage has an opening at outer circumference of the camshaft.

REFERENCES:
patent: 4858572 (1989-08-01), Shirai et al.
patent: 5107804 (1992-04-01), Becker et al.
Patent Abstracts of Japan, vol. 017, No. 479 (M-1471), Aug. 31, 1993 & JP 05 11312 A (Toyo A Tec KK), May 7, 1993.

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