Page 3 of catalogue Rotary actuators of SKF Linearsysteme GmbH

Rotary actuators - CRAB series
The direct route to precise positioning

SKF rotary actuators are designed to provide partial rotary motion. Fast or slow. Heavy or light duty. Complex or simple arrangements. You can choose from a wide variety of application areas. And you will find a solution with both technical and economic advantages.

The design of the rotary actuator enables very high torque. Furthermore, the power requirements are modest. Since the gearing is produced in one stage, through the use of a ball screw, you can also rely on a high degree of efficiency. You can select

the zero-backlash versions for maximum precision. Our other models provide reliable operation at a lower cost. With SKF rotary actuators you have complete units which are virtually maintenance and lubrication-free. Moreover, they are not sensitive to either high or low temperatures.

SKF rotary actuators have few moving parts. At the heart of the design lies a ball screw supported in a ball bearing, a gear rack connected to the ball screw nut and a gear wheel/output shaft. When the ball screw rotates, the gear rack makes a linear movement.

This causes the gear wheel and output shaft to rotate. The special geometric design and the straightcut profile of the gear teeth enable smooth operation with extreme stiffness. The working range of the output shaft depends on the choice of model.

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