| 摘要 |
A crankshaft assembly for a four-stroke internal combustion engine, the crankshaft assembly includes a crank shaft (10) with a crank (13) extending radially therefrom, and an eccentric support (16) mounting a piston rod (11) on the crank (13), with said support (16) being driven by a gear train (19, 20, 21, 23) so as to have half the rotational speed as the crankshaft (10), thereby providing a piston attached to the piston rod (11) with a greater stroke during the exhaust phase in comparison to the compression phase of the engine. |
