Here, such a connecting rod of my idea .. For a semi-rotary shaft, it can be such, because all forces act by pushing the connecting rod to the lever .. only incidentally it is possible to act detachment parts from each other, so its protection can be negligible .. During normal engine operation, piston it is only pressed against the lever all the time ..
However, the cooperating surfaces are relatively large, and the connecting rod weight is smaller .. Formy Feliks Commer ..
Andrew
