Valve timing control system for internal combustion engine

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

1996-05-13

1997-09-23

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, 464 2, 13762569, F01L 134

Patent

active

056693435

ABSTRACT:
A valve timing control system for an internal combustion engine includes a valve timing varying mechanism having a camshaft for driving an intake or exhaust valve, a hydraulic piston for varying an angular phase of the camshaft relative to an engine crankshaft, and valve timing advancing and retarding hydraulic pressure chambers for determining a position of the hydraulic piston. The valve timing control system further includes a control valve for controlling hydraulic pressures to be applied to the hydraulic pressure chambers. The control valve includes a sleeve and a spool slidably received in the sleeve. The sleeve is formed with a plurality of openings which, in cooperation with the spool, selectively establish and prohibit communication of the hydraulic pressure chambers relative to high and low pressure sides. Each of the openings is in the form of a groove and extends partially along the circumference of the sleeve. Arrangement of these openings is such that the adjacently arranged openings of at least one pair are offset relative to each other by 180 degrees in a circumferential direction of the sleeve and by a given small distance in an axial direction of the sleeve.

REFERENCES:
patent: 3952775 (1976-04-01), Ogata
patent: 5058539 (1991-10-01), Saito et al.
patent: 5170756 (1992-12-01), Szodfridt
patent: 5203290 (1993-04-01), Tsuruta
patent: 5263443 (1993-11-01), Schechter
patent: 5301639 (1994-04-01), Satou

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