| 摘要 |
A single cylinder internal combustion engine has an inline counterbalance weight system which includes a counterbalance shaft rotatably mounted ot a crankcase and extending generally parallel to a crankshaft of the engine and transverse to and aligned with the rectilinear path of reciprocation of the piston pivotally connected to the crankshaft, and a counterbalance weight eccentrically mounted on the counterbalance shaft. The counterbalance shaft and weight are rotated in a direction opposite to the direction of rotation of the crankshaft. The crankshaft and the weights mounted thereon and the counterbalance weight are aligned with and disposed in symmetrical relationship to the rectilinear path of the piston. In such arrangement, vibration imbalance in the engine in the direction of the rectilinear path of the piston is substantially eliminated due to the force vector of the reciprocating piston being generally balanced by the force vectors of the rotating counterbalance weight and the crankshaft and weights thereon when the piston is at opposite end positions of its stroke. Also, the rocking imbalance in the engine is substantially eliminated due to the generally equal displacement of the force vector of the reciprocating piston, the counterbalance weight and the crankshaft and weights thereon from the mounting base defined on the crankcase and the generally balanced relationship of the force vector of the rotating crankshaft and weights thereon with the froce vector of the rotating counterbalance weight when the piston is at an intermediate position between opposite end positions of its stroke.
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