Due to increasingly stringent regulations on Internal Combustion Engine emissions, companies are heavily investing on new strategies regarding hybrid and electric vehicles. The goal of this thesis, indeed, is to investigate if an Off-road Hybrid P2 Power Unit can be realized with a one-way clutch, used as coupling device between ICE and electric motor. First of all, considering the working principle of one-way clutch, what are advantages and disadvantages of using this device instead of a friction clutch, more common in this kind of applications, have been evaluated. One-way clutch transmits torque from outer sleeve, engaged with the engine in this application, to inner sleeve, engaged with the electric motor, if sleeve speeds are equal.