Epitrochoidal crankshaft mechanism and method
OwnerThomas Mark Venettozziinventor
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Abstract
This invention relates to a mechanism and method for enhancing the performance of both two stroke and four stroke cycle reciprocating piston internal combustion engines, reciprocating piston pumps and compressors by generating an Epitrochoidal path of travel for the lower end of the connecting rod. The piston, attached to the upper end of the connecting rod, will be made to dwell at the lower part of its travel, enhancing the output of the engine, pump or compressor through better utilization of the available cylinder pressure.
Claims50
In a machine with at least one cylindrical housing with a central axis having at least one reciprocating piston traveling in the cylindrical housing along the central axis between a top dead center position and a bottom dead center position, a crankshaft rotatably mounted in a crankcase in said machine for rotation about a crank axis with at least one crankpin radially disposed on said crankshaft and having a crankpin axis parallel to the crank axis, and a connecting rod with an upper end pivotally attached to said piston at an upper end journal and a lower end pivotally attached to said crankpin at a lower end journal, said upper end pivoting about an upper end journal axis parallel to said crank axis and said lower end pivoting about a lower end journal axis parallel to said crank axis;
- a mechanism comprising an eccentric bearing with an axially eccentric journal having an eccentric journal axis parallel to the lower end journal axis and offset from the crankpin axis, said eccentric bearing interposed between the lower end and crankpin to generate a noncircular path for the lower end during rotation of the crankshaft in the crankcase.
A method of enhancing the performance of a machine with at least one cylindrical housing with a central axis having at least one reciprocating piston traveling in the cylindrical housing along the central axis between a top dead center position and a bottom dead center position, a crankshaft rotatably mounted in a crankcase in said machine for rotation about a crank axis with at least one crankpin radially disposed on said crankshaft and having a crankpin axis parallel to the crank axis. and a connecting rod with an upper end pivotally attached to said piston at an upper end journal and a lower end pivotally attached to said crankpin at a lower end journal said upper end pivoting about an upper end journal axis parallel to said crank axis and said lower end pivoting about a lower end journal axis parallel to said crank axis comprising the steps of
- providing an eccentric bearing with an axially eccentric journal and eccentric journal axis parallel to the lower end journal axis.
- placing said eccentric bearing in the lower end journal,
- placing the crankpin in the eccentric journal where the eccentric bearing journal axis is parallel to and offset from the crankpin axis,
- causing the lower end to follow a noncircular path during rotation of the crankshaft in the crankcase wherein said noncircular path is an epitrochoid and said epitrochoid path extends the time spent by the piston dwelling at bottom dead center position in the cylindrical housing during rotation of the crankshaft in the crankcase.
Dependencies are inferred from the claim text.