Patent ID: 8281763
Filing Date: 2012-10-09
Classification: F01B,F02B,Y10T

Abstract:
1. An internal combustion engine, comprising a piston capable of sliding within a cylinder bore and a crankshaft coupled operatively through a connecting member to the piston, and capable of converting reciprocating motion of the piston into rotational motion of the crankshaft to output rotational power from an output shaft supported by a case member, wherein; the crankshaft comprises a crankpin coupled to the connecting member, a pair of crank arms and a pair of counter weights, a pair of crank journals, and at least one crankshaft portion which extends coaxially from at least one crank journal; and said internal combustion engine, further comprises: at least one output member supporting the crankshaft rotatably around a rotary axial center off-centered from an axial center of the output shaft and being formed integrally with the output shaft and supported by a case member rotatably coaxially with the output shaft; at least one internal gear member having a plurality of internal gear teeth formed coaxially with the output member and being fixed to the case member; at least one pinion member having an outer diameter equal to ½ of an inner diameter of the internal gear member and engaging so as to be capable of rolling along an inner periphery of the internal gear member, said pinion member being fitted externally on the crank shaft portion rotatably integrally with the crankshaft portion in a position adjacent to the crank journal; and a pair of journal support members having respective bearings to support a pair of crank journals rotatably around an axial center off-centered from the axial center of the output shaft and being supported by the case member rotatably coaxially with the output member; and said internal combustion engine converting the reciprocating motion of the piston into rotation and revolution of the pinion member, and converting the revolution of the pinion member into rotation of the output member to be output as rotational power from the output shaft.