Automatic compression adjusting mechanism for internal combustion engines
A means is provided for controlling the compression pressure in an internal combustion engine having one or more cylinders and subject to widely varying power output requirements. Received between each crank pin and connecting rod is an eccentric sleeve selectively capable of rotation about the crank pin and/or inside the rod and for latching with the rod to vary the effective length of the connecting rod and thereby the clearance volume of the engine. The eccentric normally rotates inside the connecting rod during the exhaust and intake strokes but a latching pawl carried by the eccentric is movable radially outwardly to latch the rod and eccentric together. A control valve responds to intake manifold pressure to time the supply of hydraulic fluid to move the latch-pawl outwardly, varying the rod length to maintain a substantially optimum firing chamber pressure at all intake manifold pressures.
- Research Organization:
- National Aeronautics and Space Administration, Houston, TX (USA). Lyndon B. Johnson Space Center
- OSTI ID:
- 5773041
- Report Number(s):
- NASA-CASE-MSC-18807-1
- Country of Publication:
- United States
- Language:
- English
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