Variable compression ratio piston

Details Variable compression ratio piston Variable compression ratio piston

1976-02-20

1977-06-28

Husar, C. J.

Internal-combustion engines

Four-cycle

Variable clearance

123 48B, 92 82, 92216, F02B 7504

Patent

active

040318680

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 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 combustion chamber pressure after it has been achieved. The lower chamber is disposed adjacent the piston ring area and a sealing ring is utilized as a valve for regulating oil flow from the upper chamber to the lower chamber.

REFERENCES:
patent: 3417738 (1968-12-01), Basiletti et al.
patent: 3527264 (1970-09-01), Bachle
patent: 3667433 (1972-06-01), Isley

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