User:Aryanavnish/sandbox

Hybrid-electric drivetrain coupling mechanisms

 * Mechanical couplings are generally used to connect rotating shafts of a driver and a driven piece of equipment. For example, they are used to connect the shaft of an electric motor to a pump, or to connect an engine to a compressor.
 * There are two types of coupling in the HEV drive train, torque coupling and speed coupling.

Torque coupling:
In this coupling, torque characteristics of both the Internal combustion engine and battery powered traction motor are added. Consider the final torque characteristic of the output from the torque couple to be T3 and the individual torque characteristics of combustion engine and traction motor to be T1 and T2 respectively, then T3 = T1 + T2. Speed characteristic(W3) of this couple will be W3 = (k1*W1)+(k2*W2) where k1 and k2 are the ratio of number of teeth in the output shaft gearing(z3) to the respective gear systems of the shafts of combustion engine(z1) and traction motor(z2).

Speed coupling:
Speed characteristics of both the combustion engine and traction motor are summed. Consider the final speed characteristic of the output from the speed couple to be W3 and the individual torque characteristics of combustion engine and traction motor to be W1 and W2 respectively, then W3 = W1+ W2.