Mechanical compression and vacuum release

Mechanical compression and vacuum release

An internal combustion engine (10) having a vacuum release mechanism (70, 70') that includes a centrifugally actuated member (72, 72') movably attached to the camshaft (30, 30') and having a vacuum release cam (84, 84') extending therefrom. The vacuum release cam is in lifting en...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: MAHY, MICHAEL A, DIETZ, JAMES R, NOVAK, KEITH A
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
BLASTING
CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
ENGINE PLANTS IN GENERAL
HEATING
LIGHTING
MACHINES OR ENGINES IN GENERAL
MECHANICAL ENGINEERING
STEAM ENGINES
WEAPONS
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Beschreibung
Zusammenfassung:An internal combustion engine (10) having a vacuum release mechanism (70, 70') that includes a centrifugally actuated member (72, 72') movably attached to the camshaft (30, 30') and having a vacuum release cam (84, 84') extending therefrom. The vacuum release cam is in lifting engagement with the exhaust valve assembly at crankshaft cranking speeds during a portion of the power stroke to relieve vacuum forces opposing motion of the piston (14). The vacuum release cam centrifugally pivots out of engagement with the exhaust valve assembly in response to the crankshaft attaining running speeds.