Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1976-03-31
1977-10-18
Lazarus, Ronald H.
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9055, 123 9056, F01L 134, F01L 114
Patent
active
040541096
ABSTRACT:
Variable overlap of the intake and exhaust valve opening periods for an internal combustion engine is obtained by providing a speed responsive yieldable link in the valve actuating mechanism that varies the effective valve lift with engine speed. The variation is accomplished by flow responsive valves, preferably incorporated in hydraulic tappets for actuating the valves and arranged to begin valve lift only when a predetermined lift rate of the valve actuating cam is reached. Since this rate is reached earlier as the engine speed increases, a greater portion of the cam lift curve is utilized with increased speed, thus increasing the valve lift and extending the valve opening period relative to crankshaft rotation. In this way, angular overlap of the intake and exhaust valve opening periods is varied as a function of engine speed.
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Herrin Ronald J.
Pozniak Donald J.
General Motors Corporation
Lazarus Ronald H.
O'Connor Daniel J.
Outland Robert J.
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