2. Operation of a single-cylinder

The Powertrain Unit is subjected to two types of applied loadings, those from the gas combustion cycle and those related to inertia phenomena.

• Different forces

  The gases in a cylinder produce a variable pressure during the cycle which, at the moment of combustion, generate a so-called «  gas force  » on the piston, a force which is the cause of its displacement and that of the engine’s traction.

  Similarly, the moving parts (piston, rod, etc.), which are subjected, through the connecting rod/crank system, to accelerations, undergo so-called «  inertial forces  ».

  Generalised forces, which represent the results of forces and moments when they are applied to the powertrain, enable...