Variable compression ratio device of internal combustion engine

Details Variable compression ratio device of internal combustion engine Variable compression ratio device of internal combustion engine

2008-05-27

2008-05-27

Cronin, Stephen K. (Department: 3747)

Internal-combustion engines

Rotating cylinder

Parallel to shaft

C123S0480AA, C123S056400, C123S0780AA, C091S505000, C092S082000

Reexamination Certificate

active

11645493

ABSTRACT:
A variable compression ratio device of an internal combustion engine includes a piston inner part connected to a connecting rod and a piston outer part fitted on an outer periphery of the piston inner part. The piston outer part is only slidably in an axial direction, and is movable between a low compression ratio position near the piston inner part and a high compression ratio position near the combustion chamber. A skirt part is slidable and is guided by an inner peripheral surface of a cylinder bore of an engine. The skirt part is integrally formed on the piston inner part. A peripheral wall of the piston outer part is terminated directly above the skirt part. Thus, switching of the position between the low compression ratio position and the high compression ratio position by an inertia force of the piston outer part is performed smoothly with a reduction in weight of the piston.

REFERENCES:
patent: 2376214 (1945-05-01), Webster
patent: 3156162 (1964-11-01), Wallace et al.
patent: 5476074 (1995-12-01), Boggs et al.
patent: 7066118 (2006-06-01), Hirano
patent: 2004/0231619 (2004-11-01), Hirano
patent: 2004-44512 (2004-02-01), None

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