| 摘要 |
A reciprocating piston type internal combustion engine comprising a small gear rotatably mounted between one of crank arms and a connecting rod by means of a pivot provided on said one crank arm in the same phase as a crank-pin and projecting toward the connecting rod, an internal gear having a number of teeth twice that of said small gear and fixedly mounted on the inner wall of a crankcase in meshing engagement with said small gear, a rotating balance weight provided on said small gear in such a way that it is in its lower position when the crank-pin is in the top dead center, and a revolving balance weight provided on the crank arms on the side opposite to the crank-pin with respect to crank journals. |
