A rotary actuator comprising: an actuator body (10) having a first end (10a) and a second end (10b) defining an interior (15) of the actuator body therebetween, an axis X of the body being between the first and second ends, each end provided with a port (12a, 12b) arranged to receive hydraulic fluid; mounting parts (14a, 14b) extending from the ends into the interior of the actuator body a screw (20) mounted to the mounting parts within the actuator body between the first and second ends, the screw mounted to the mounting parts via splines (30) to allow linear axial translation of the screw relative to the mounting parts; the screw having one or two walls (70a, 70b) extending across an inner diameter d of the screw; the actuator body, the mounting parts and the wall or walls defining a first chamber (80a) in fluid communication with the port (12a) at the first end of the actuator body and a second chamber (80b) in fluid communication with the port at the second end of the actuator body; a first piston (800a) having a piston head (801a) located within the first chamber, a second piston (800b) with a piston head (801b) located within the second chamber; a nut (40) mounted within the actuator body around the screw, the nut having an inner diameter D; ball bearings (50) between the screw and the nut such that axial movement of the screw relative to the mounting parts causes rotational movement of the ball bearings which causes rotation of the nut relative to the screw and to the body; the splines (30) being provided radially between the nut and the screw and so within the inner diameter D of the nut; wherein the axial translation of the screw is caused by the force of hydraulic fluid in the first or second chamber, from the port, pushing against the piston, the piston head of which pushes against the wall or walls defining the chamber.
ROTARY ACTUATOR
DREHSTELLER
ACTIONNEUR ROTATIF
2024-11-27
Patent
Electronic Resource
English
NTIS | 1971
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