Variable length crank arm for crank shaft - uses two web pieces between journals to form guideway for two roller slides connected by crank pin

摘要

The crank shaft uses two crank arms connected by a shaft journal, and each providing an internal passage for two slides connected by the crank pin. Rollers on the external slide faces assist its movement over the crank arm walls, and two cylindrical force rods project from each leading slide face. The rods enter appropriately contoured crank arm guides, serving to improve slide guidage and structural performance.