Variable compression ratio piston

Details Variable compression ratio piston Variable compression ratio piston

1976-07-19

1978-03-21

Myhre, Charles J.

Internal-combustion engines

Four-cycle

Variable clearance

92 605, 123 48B, F02B 7504

Patent

active

040797074

ABSTRACT:
A two part variable compression ratio (VCR) piston assembly for use in a two cycle internal combustion engine, the piston assembly including an outer member movable relative to an inner member to vary the compression ratio of the engine and a hydraulic system utilizing oil from the lubrication system of the engine to automatically control the relative movement of the members to maintain a predetermined maximum combustion chamber pressure. The hydraulic circuit includes an upper and a lower chamber which expands and contracts conversely upon relative movement of the piston members and further includes a pumping system for pumping oil to the upper chamber and to the lower chamber through the upper chamber to thereby vary the compression ratio of the piston. The lower chamber is disposed adjacent the piston ring area of the piston assembly and the hydraulic system includes a pressure responsive release valve to discharge oil from the upper chamber to the crankcase of the engine upon a predetermined pressure being produced in the upper chamber.

REFERENCES:
patent: 1825163 (1931-09-01), Schweter
patent: 2742027 (1956-04-01), Mansfield
patent: 3200798 (1965-08-01), Mansfield
patent: 3450113 (1969-06-01), Bachle
patent: 3527264 (1970-09-01), Bachle

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