Compression ratio-changing device for internal combustion engine

Details Compression ratio-changing device for internal combustion engine Compression ratio-changing device for internal combustion engine

1988-06-29

1989-09-12

Okonsky, David A.

Internal-combustion engines

Adjustable combustion chamber

Piston in head adjusted

123 78BA, F02D 1502

Patent

active

048649775

ABSTRACT:
A compression ratio-changing device for an internal combustion engine, includes an oil passageway formed through a connecting rod of the engine and connected to a hydraulic oil source. A combustion chamber volume-changing device is provided in the piston and operable by means of hydraulic pressure supplied from the hydraulic oil source through the oil passageway for changing the volume of the combustion chamber and hence changing the compression ratio of the engine. A hydraulic pressure control valve is arranged in the connecting rod for controlling the supply of the hydraulic pressure to the combustion chamber volume-changing device. A driving device is provided at a cylinder block of the engine for driving the hydraulic pressure control valve to cause the combustion chamber volume-changing device to change the volume of the combustion chamber.

REFERENCES:
patent: 4515114 (1985-05-01), Dang
patent: 4516537 (1985-05-01), Nakahara et al.
patent: 4602596 (1986-07-01), Kessler
patent: 4721073 (1988-01-01), Naruoka et al.

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