Hardened R,S,F,K series reducer special for YE2/YE3 series three-phase asynchronous motor is my company in order to meet the need of design of reducer supporting door motor. In the fiange end structure and bearing to cover are made improve-ments and regulation in the same model and a variaty of fimnge and cap collocation, to mæt different installation requraments of the sizes of. Solaction of I-shaped flange end cop,a xle of quenching and tempering treatment, all the same time, increase the benring quality, can improve the bearing capacity, the safety factor is increased and the service life of the motor.