I am an undergraduate student in mechanical engineering. One of our professors project is to design a ski lift. A problem my team came across is how to connect the diesel and the electric engine into the pulley-rope system. We have 2 inputs and 1 output, but the inputs need to work separately (the electric engine will be the main engine, but in case something happens the diesel engine needs to start). I think about using a gear box or something similar, is there anything that can be used for this problem?

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    $\begingroup$ think of a differential from a rear wheel drive vehicle ... drive the two axles with the motors $\endgroup$
    – jsotola
    Commented Jul 23, 2023 at 21:35

1 Answer 1



  1. the motors drive hydraulic pumps as input, output is from a hydraulic motor - if swash plate ones are chosen then input and output can be controlled from zero to max.

  2. a differential can be used as 2 in one out.

Bendix or oneway clutches may help.

  1. epicyclic gearbox could also be used.

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