US 2010/0162838 A1 · ELECTRIC ACTUATOR

Abstract

An object of the present invention is to provide an electric actuator having a structure capable of reducing an external force or impact acting on an screw shaft when a piston rod is at a stretched position. An electric actuator 1 includes a nut 5, a piston rod 4, recesses 6, keys 7, holes 8, an a tapered portion 9. Into the nut 5, a screw shaft 3 is screwed. The piston rod 4 moves linearly via the nut 5. The recesses 6 are formed on an outer circumferential surface of the nut 5. The keys 7 are each provided to a recess 6. The tapered portion 9 is formed on an inner wall of the cylinder body 2. The piston rod 4 advances to move the keys 7 outward to cause the keys 7 to fit to the tapered portion 9 to block retraction of the piston rod 4.

Claims5

Dependent claims

An electric actuator comprising:

a cylinder body;
a screw shaft which is provided in the cylinder body, and rotated by an electric motor;
a nut into which the screw shaft is screwed;
a piston rod which moves linearly in accordance with rotation of the screw shaft via the nut;
a recess formed on an outer circumferential surface of the nut;
a key provided to the recess;
a hole which is formed on an outer circumference of a piston part of the piston rod, and into which hole the key is fitted;
and
a tapered portion formed on an inner wall of the cylinder body and to which the key is fitted,
wherein the piston rod advances to move the key outward to cause the key to fit to the tapered portion to block retraction of the piston rod.

7 more elements

Dependencies are inferred from the claim text.

Electric actuator

Life of this patent

Electric actuator

Life of this patent

Abstract

Claims5