Patent ID: 8616528

Claim:
A hydraulic powered spool assembly comprising: a support unit; a spool rotatable about an axis relative to the support unit; a hydraulic motor responsive to receiving hydraulic fluid for rotating the spool relative to the support unit; and the hydraulic motor being integral with the spool; wherein said hydraulic motor is an internally generated rotor type gerotor motor having at least one power unit, said at least one power unit includes an inner rotor that is fixed against rotational movement relative to the support unit, an outer rotor that is rotatably disposed relative to said support unit to move about said inner rotor in response to fluid being received in variable displacement chambers located between said inner and outer rotors, said inner rotor and said outer rotor and said chambers being disposed substantially entirely within said spool, and said spool being rotatably disposed relative to said support unit for non-orbital rotation as a result of rotation of said outer rotor.