Electric actuator
AssigneeSMC Corporation
InventorsShigekazu Nagai, Shuuzou Sakurai
Life of this patent
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Abstract
An electric actuator comprises a main actuator body 12, a driving unit 16, a feed screw shaft 32 for transmitting rotary driving force of a rotary driving source 14, a displacement member 40 for externally fitting and surrounding the feed screw shaft 32 to make displacement along the axial direction in accordance with the engaging action between a male thread 36 and a female thread 42, sensor attachment long grooves 24a, 24b provided at side surface portions of the main actuator body 12, and sensors 25 installed at predetermined portions in the sensor attachment long grooves 24a, 24b.
Claims10
An electric actuator comprising:
- a cylindrical main actuator body;
- a rotary driving source which is arranged in a driving unit disposed beside said main actuator body;
- a rotary driving force-transmitting member which is coaxially coupled to a driving shaft of said rotary driving source, for transmitting a rotary driving force of said rotary driving source;
- a displacement member which surrounds said rotary driving force-transmitting member and which is displaceable along an axial direction of said main actuator body in accordance with an engaging action with said rotary driving force-transmitting member;
- a sensor which is used to detect a magnetic field of a permanent magnet displaceable integrally with said displacement member;
- and
- a fastening member which is disposed at a side surface portion of said main actuator body and which is used to fasten a lead wire of said sensor,
- wherein said rotary driving force-transmitting member is composed of a feed screw shaft, and said displacement member is displaceable along said axial direction in accordance with an engaging action effected by a male thread formed on an outer circumference of said feed screw shaft and a female thread formed on an inner circumferential surface of said displacement member.
Dependencies are inferred from the claim text.