Variable camshaft timing system utilizing square-edged spool val

Details Variable camshaft timing system utilizing square-edged spool val Variable camshaft timing system utilizing square-edged spool val

1992-05-15

1993-05-04

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, 464 2, F01L 134

Patent

active

052071928

ABSTRACT:
A camshaft (126) has a vane (160) secured to an end thereof for non-osciling rotation therewith. The camshaft also carries a sprocket (132) which can rotate with the camshaft but which is oscillatable with respect to the camshaft. The vane has opposed lobes (160a, 160b) which are received in opposed recesses (132a, 132b), respectively, of the sprocket. The recesses have greater circumferential extent than the lobes to permit the vane and sprocket to oscillate with respect to one another, and thereby permit the camshaft to change in phase relative to a crankshaft whose phase relative to the sprocket is fixed by virtue of a chain drive extending therebetween. The camshaft tends to change in reaction to pulses which it experiences during its normal operation, and it is permitted to change only in a given direction, either to advance or retard, by selectively blocking or permitting the flow of hydraulic fluid, preferably engine oil, through the return lines (194, 196) from the recesses by controlling the position of a spool (200) within a valve body (198) of a control valve in response to a signal indicative of an engine operating condition from an engine control unit (208). The spool contains square-edged lands (254, 256) which prevent hydraulic fluid contamination from wedging between the valve body and the spool itself.

REFERENCES:
patent: 5002023 (1991-03-01), Butterfield
patent: 5046460 (1991-09-01), Butterfield et al.
patent: 5056477 (1991-10-01), Linder et al.
patent: 5056478 (1991-10-01), Ma
patent: 5078647 (1992-01-01), Hampton
patent: 5088456 (1992-02-01), Suga
patent: 5107804 (1992-04-01), Becker et al.
patent: 5121717 (1992-06-01), Simko et al.

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