Internal-combustion engines – Four-cycle – Variable clearance
Patent
1978-07-27
1980-12-30
Cohen, Irwin C.
Internal-combustion engines
Four-cycle
Variable clearance
92 82, 123 48B, F02B 7504
Patent
active
042417058
ABSTRACT:
A two part variable compression ratio (VCR) piston assembly having an outer member movable relative to an inner member to vary the compression ratio of an internal combustion engine and a hydraulic system utilizing oil from the lubrication system of the engine for automatically controlling the relative movement of the members to maintain a predetermined maximum combustion chamber pressure. A hydraulic circuit includes an upper and lower chamber which expand and contract conversely upon relative movement of the piston members and a system for supplying oil to the upper chamber and to the lower chamber via the upper chamber and for discharging the oil from the upper chamber in a manner which gradually changes the compression ratio of the piston until a predetermined maximum combustion chamber pressure has been achieved and which tends to maintain the maximum combustion chamber pressure after it has been achieved. A valve assembly for supplying lubricant to the upper chamber and for discharging lubricant from the upper chamber into the engine crankcase upon a predetermined maximum pressure includes a housing which is insertable into a bore formed on the piston inner member and detachably locked into position.
REFERENCES:
patent: 2698054 (1954-12-01), Brown et al.
patent: 2742027 (1956-04-01), Mansfield
patent: 3304952 (1967-02-01), Krone
patent: 3405697 (1968-10-01), Marchand
patent: 4016841 (1977-04-01), Karaba et al.
patent: 4031868 (1977-06-01), Karaba et al.
Bowen Glen L.
Karaba Albert M.
Kauffman Brian C.
Cohen Irwin C.
Teledyne Industries Inc.
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