F - Mech Eng,Light,Heat,Weapons – 01 – L
Patent
F - Mech Eng,Light,Heat,Weapons
01
L
171/35, 121/95
F01L 11/02 (2006.01) F16J 1/00 (2006.01)
Patent
CA 1066625
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 lubrication system of the engine for automatically controlling the relative movement of the members to maintain a predetermined maximum combus- tion 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 up- per 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. 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 cham- ber to the crankcase of the engine upon a predetermined pressure being pro- duced in that chamber.
311842
Brouwers Alexander P.
Karaba Albert M.
Pearsall Thomas J.
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