Internal combustion engine

Details Internal combustion engine Internal combustion engine

2006-12-12

2008-08-19

Cronin, Stephen K. (Department: 3747)

Internal-combustion engines

Frame construction

Horizontal cylinder

C123S1950HC, C123S0780AA, C123S0780AA, C123S0780AA, C123S0480AA, C123S0480AA

Reexamination Certificate

active

07412958

ABSTRACT:
A piston-crank mechanism links crankpins of a crankshaft with piston pins of pistons by using a plurality of links. The piston-crank mechanism allows an upward inertia force produced near a top dead center of each piston to be smaller than a downward inertia force produced near a bottom dead center of the piston in order to reduce secondary vibration occurring during operation. In a four-cycle inline four-cylinder internal combustion engine, a total force of inertia forces exerted from adjacent cylinders to each of second and fourth crankshaft bearings becomes a downward force, which reinforces a downward force produced in response to combustion pressure. These second and fourth crankshaft bearings have a rigidity higher than the remaining crankshaft bearings.

REFERENCES:
patent: 5441019 (1995-08-01), Sayer et al.
patent: 2005/0078895 (2005-04-01), Kanbe et al.
patent: 1154134 (2001-11-01), None
patent: 1361350 (2003-11-01), None
patent: 1431617 (2004-06-01), None
patent: 1533495 (2005-05-01), None
patent: 2002-61501 (2002-02-01), None

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