Internal-combustion engines – Four-cycle – Variable clearance
Reexamination Certificate
2006-03-07
2006-03-07
Yuen, Henry C. (Department: 3747)
Internal-combustion engines
Four-cycle
Variable clearance
C123S197400
Reexamination Certificate
active
07007640
ABSTRACT:
The engine is equipped with a crankshaft that is rotatably connected to pistons through connecting rods, and a driveshaft, which is used as the means for outputting the torque produced by the engine. The variable compression ratio mechanism of the preferred embodiment includes at least one crankshaft-driveshaft arm assembly, at least one crankshaft support assembly, and at least one jackscrew assembly. The crankshaft-driveshaft arm assembly ensures that the axis of the crankshaft when it is lifted will follow a circular arc with a fixed radius that centers the rotational axis of the driveshaft. The crankshaft-driveshaft arm assemblies and the crankshaft support plate assemblies are connected together by metal plates. A transmission assembly transmits the torque from the crankshaft to the driveshaft. The jackscrew assembly lifts up and down the crankshaft, and it does not require a locking mechanism.
REFERENCES:
patent: 4998511 (1991-03-01), Van Avermaete
patent: 5443043 (1995-08-01), Nilsson et al.
patent: 5908014 (1999-06-01), Leighthinger
patent: 6202623 (2001-03-01), Ehrlich
patent: 6247430 (2001-06-01), Yapici
patent: 6443107 (2002-09-01), Mendler
patent: 6450136 (2002-09-01), Klomp et al.
patent: 6588384 (2003-07-01), Yapici
Ali Hyder
Yuen Henry C.
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