Compression ratio changing device in internal combustion engine

Details Compression ratio changing device in internal combustion engine Compression ratio changing device in internal combustion engine

1995-06-07

1996-10-08

Macy, Marguerite

Internal-combustion engines

Adjustable combustion chamber

Piston in head adjusted

123 78E, 1231974, 123 78BA, F02D 1502, F02B 7504

Patent

active

055620680

ABSTRACT:
A compression ratio changing arrangement in an internal combustion engine. In order to change the compression ratio by utilizing, to the maximum, an eccentric amount between inner and outer peripheral surfaces of an eccentric ring interposed between a crank pin and a large end of a connecting rod in a compression ratio changing device, the eccentric ring is selectively connected to the crank pin or the large end of the connecting rod by a connecting pin with the thinnest portion or thickest portion of the connecting ring being turned toward the center of rotation of a crankshaft. The selective connection is performed when the piston is at botton dead center. When the eccentric ring has been connected to the crank pin, the stroke of the piston is increased or decreased by an amount corresponding to two times the eccentric amount of the eccentric ring without changing the position of the bottom dead center of the piston, as compared to the stroke with when the eccentric ring has been connected to the large end.

REFERENCES:
patent: 4254743 (1981-03-01), Reid et al.
patent: 4450797 (1984-05-01), Moser
patent: 4687348 (1987-08-01), Naruoka et al.

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