Internal combustion engine with variable compression ratio...

Details Internal combustion engine with variable compression ratio... Internal combustion engine with variable compression ratio...

2006-05-02

2006-05-02

Yuen, Henry C. (Department: 3747)

Internal-combustion engines

Four-cycle

Variable clearance

Reexamination Certificate

active

07036468

ABSTRACT:
A variable compression ratio engine has a compression ratio varying mechanism, which moves a cylinder block relative to a lower case. The rotational driving force of a servo motor is transmitted to vertical sliding movements of the cylinder block by means of cam shafts with eccentric cams. First and second rows of spring members and are arranged on both sides of the cylinder block. The resultant spring force of the first and second spring members is applied to the cylinder block and the lower case. The resultant spring force works to reduce the transmission torque of the rotational driving force of the servo motor and assist the compression ratio varying mechanism to vary a compression ratio of the engine. The technique simplifies the control procedure of varying the compression ratio of the engine and reduces the size of the mechanism required.

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Haraldsson et al. “HCCI Combustion Phasing in a Multi Cylinder Engine Using Variable Compression Ratio,” 2002-01-2858, Society of Automotive Engineers, Inc., 2002.
Schwaderlapp et al. “Variable Compression Ratio—A Design for Fuel Economy Concepts,” 2002-01-1103, Society of Automotive Engineers, Inc., 2002.
Moteki et al. “A Study of Variable Compression Ratio System With a Multi-Link Mechansim,” Society of Automotive Engineers International, 2003.

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