Electric actuator for marine steering system
AssigneeMarine Canada Acquisition Inc.
InventorsNoam Dean Davidson, Ray Tat Lung Wong, Mark Isaac Dyck
Life of this patent
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Abstract
An electric actuator comprises a housing and an output shaft reciprocatingly received by the housing. There is a screw assembly disposed within the housing and coupled to the output shaft. The screw assembly includes a plurality of annular rollers and a central screw received by the annular rollers. The annular rollers are rotatable about the central screw. There is a motor which includes a stator and a rotor. The rotor has an inner bore which engages the annular rollers. Rotation of the rotor causes the central screw to translate axially relative to the rotor and the output shaft to reciprocate relative to the housing.
Claims9
An electric actuator for a marine steering system, the electric actuator comprising:
- a housing;
- an output shaft reciprocatingly received by the housing;
- a screw assembly disposed within the housing and coupled to the output shaft, the screw assembly including a nut and a central screw received by the nut, the nut being rotatable about the central screw;
- a motor including a stator and a rotor, the rotor having an inner bore which engages the nut, wherein rotation of the rotor causes the central screw to translate axially relative to the rotor and the output shaft to reciprocate relative to the housing;
- and
- an adjustable clutch coupled to the rotor which inhibits rotation of the rotor;
- the clutch including an electromagnet fixed to the housing and a clutch plate translatable axially relative to the housing, the clutch plate being preloaded to be spaced-apart from the electromagnet and abutting the rotor, wherein friction between the clutch plate and the rotor inhibits relative rotation of the rotor.
An electric actuator for a marine steering system, the electric actuator comprising:
- a housing;
- an output shaft reciprocatingly received by the housing;
- a screw assembly disposed within the housing and coupled to the output shaft, the screw assembly including a nut and a central screw received by the nut, the nut being rotatable about the central screw;
- a motor including a stator and a rotor, the rotor having an inner bore which engages the nut, wherein rotation of the rotor causes the central screw to translate axially relative to the rotor and the output shaft to reciprocate relative to the housing;
- and
- an adjustable clutch coupled to the rotor which inhibits rotation of the rotor,
- wherein a cogging torque of the electric actuator is tuned to slip at a predetermined back-driving force to function as a clutch.
Dependencies are inferred from the claim text.