Variable compression ratio system

Details Variable compression ratio system Variable compression ratio system

2008-02-19

2010-11-09

Cuff, Michael (Department: 3741)

Internal-combustion engines

Adjustable combustion chamber

Piston in head adjusted

C123S0780AA

Reexamination Certificate

active

07827943

ABSTRACT:
A variable compression ratio system for use in a reciprocating-piston engine. The system allows the compression ratio in a combustion cylinder of the engine to be varied by varying the distance from a combustion chamber facing surface of a piston to the center of pivotal connection of a connecting rod to a crankshaft. The distance is varied responsive to the supply and withdrawal of pressurized hydraulic fluid. The hydraulic fluid is supplied and discharged by a slave pump pivotally connected to the connecting rod at a first end and pivotally connected to a stationary point at a second end. The slave pump supplies and withdraws hydraulic fluid responsive to the rotation of the crankshaft and a hydraulic backpressure controlled using a pressure control valve.

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