Rotork Controls Limited

David Leslie Adams

An actuator () comprising a motor () assembly, a drive coupling () assembly and an actuator shaft (). The motor () assembly comprising a motor housing (), having a cover () and a base (); an electric motor (), comprising an external stator () and an internal rotor (); and a hollow output shaft () that is connected co-axially with the internal rotor () such that rotation of the internal rotor () causes a corresponding rotation of the hollow output shaft (). The drive coupling () assembly comprises a drive coupling housing () containing a drive coupling (), wherein the drive coupling () engages the hollow output shaft () such that rotation of the hollow output shaft () causes a corresponding rotation of the drive coupling (). The actuator shaft () extends through the hollow output shaft () and the internal rotor (), and engages the drive coupling () such that rotation of the drive coupling (), by the hollow output shaft (), causes the actuator shaft () to move axially.

Actuator

An anti back-drive coupling () comprises an input () driveable about an axis A in a clockwise and anticlockwise direction in torque transmitting communication, via a mechanism, with an output () driveable about the axis by the input in either of the rotational directions, the mechanism including: a tube (), driveable by the input, carrying two cages () and () spaced along the axis A, each cage housing rollers () and () respectively; an output memberfor driving the output (), including two flattened formations () and () adjacent each cage in use, for engagement with the rollers () and () respectively; and a back-torque reaction freewheels () and () engageable with the rollers, for reacting back-torque transmitted through said output member () and into the rollers.

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Bath, United Kingdom

David Leslie Adams