F - Mech Eng,Light,Heat,Weapons – 16 – J
Patent
F - Mech Eng,Light,Heat,Weapons
16
J
171/35, 121/90
F16J 1/06 (2006.01) F01L 11/02 (2006.01) F02B 75/04 (2006.01) F01M 1/08 (2006.01)
Patent
CA 1056733
VARIABLE COMPRESSION RATIO PISTON Abstract of the Disclosure 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 lubrica- tion 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 a lower chamber which expands and contracts 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 com- bustion chamber pressure after it has been achieved. The lower chamber is disposed adjacent the piston ring area of the piston assembly and the hydraulic system includes an uniquely formed pressure responsive relief valve to discharge oil from the upper chamber to the crankcase of the engine upon a predetermined pressure being produced in that chamber.
259548
Brouwers Alexander P.
Karaba Albert M.
Pearsall Thomas J.
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