| 摘要 |
A pair of crankshafts is rotatively mounted in a crankcase and carries respectively at the ends thereof pairs of intermeshing gears for synchronizing the shafts. A reciprocating piston in a cylinder carries a main connecting rod. A pair of subconnecting rods is rotatively secured to each other and to the lower end of the main connecting rod, which subconnecting rods are respectively secured to the cranks and the crankshafts.
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