Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1993-05-03
1996-03-12
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9031, 137312, F01L 134
Patent
active
054977380
ABSTRACT:
A camshaft (126) has a vane (160) secured to an end thereof for non-oscillating rotation therewith. The camshaft also carries a sprocket (132) which can rotate with the camshaft but which is also oscillatable with 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 vented spool (200) within a valve body (198) of a control valve (192) in response to a signal indicative of an engine operating condition from an engine control unit (208) via cable (238). The vented spool is selectively positioned within the valve body by a electromechanical actuator (201) which is controlled by the engine control unit. The spool is centered when an optimum phase angle between crankshaft and camshaft is achieved.
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Quinn, Jr. Stanley B.
Siemon Edward C.
Borg-Warner Automotive Inc.
Dziegielewski Greg
Lo Weilun
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