STRUCTURE AND FUNCTION FINAL DRIVE 3. REDUCTION GEARING Function This final drive motor is equipped with a one-stage epicycloidal reduction gear that converts the high rotation speed and low torque of the hydraulic motor into low speed and high torque at the swing pinion. Operating principle Therotarymovementof the output shaft of the motor is transmitted tothe gear(s1)and henceto the bevel gears(b1)whi- ch are integrated with the planetary gear (1). Sincethe gear(a1)isfixed with respecttothe output shaftof thehydraulicmotor,theplanetarygearisobligedtoturn, mo- ving with it the output shaft (2) of the reduction gearing (connected to the planetary gear by means of grooved toothing).
The reduction ratio of the rotation speed is described by the formula: R= Zs1/(Zs1+Za1) Zs1= number of sun gear teeth Za1= number of ring gear teeth b 1 1 2 a 1 s 1 RKS01080 10-11 SK714-5 SK815-5