SEW Eurodrive Servo Gear Units

SEW Eurodrive Servo Gear Units A servo gear unit reduces the speed of a motor. It transmits the flow of force in different ways depending on how its gearing and gear unit stages are arranged and operate. The gear ratio i is therefore one of the most important characteristic values of a servo gear unit: It specifies the ratio of the input speed (on the motor side) to the output speed (on the machine side). Low-backlash processing and optimized gearing ensure that the servo gear unit is capable of receiving higher overhung loads than standard gear units and transmitting high acceleration torques at high speeds. Types of Servo Gear Units: The primary servo gear units used in industrial drive technology are coaxial gear units/planetary gear units and right-angle gear units/helical-bevel gear units. • Planetary servo gear units always transmit the flow of force coaxially. In their center, there is a sun gear that turns in the direction of rotation and at the speed of the motor. Three or more planet gears that transmit the received force to the outer annulus gear on the output side rotate around this sun gear. Due to this design, the input shaft and output shaft move in the same direction. • In contrast, the gearing in a helical-bevel servo gear unit diverts the flow of force at a right angle. The input shaft and output shaft are therefore perpendicular to each other and they rotate in opposite directions.

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