| 摘要 |
A four-cycle internal combustion engine having a piston reciprocably movable within a cylinder, a crankshaft, a rod connecting the piston to the crankshaft and means arranged between the rod and the crankshaft to vary the stroke of the piston, said means for varying the stroke comprising an internal gear, an external gear and an eccentric member, characterized in that the eccentric distance of the crankpin, the radius of the pitch circle of the external gear and the radius of the pitch circle of the internal gear are in the ratio of one to two to three.
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