Motor-contained electric actuator
AssigneeIgarashi Electric Works Ltd.
InventorsNaoto Seshita, Yoshinori Yamauchi
Life of this patent
Estimating the term…
Abstract
A small motor in a casing has a motor shaft, which has a worm outside the casing. A worm wheel is rotatably mounted to a housing for a reduction mechanism and meshes with the worm. The motor shaft is supported by radial bearings in the housing, and is supported at the bottom by a thrust bearing thereby simplifying the structure. Furthermore, a rotary disc is fixed to the motor shaft to rotate together with the motor shaft. An angle of rotation of the motor shaft is detected by a rotation detector via the rotary disc and converted to a digital signal by an electronic circuit.
Claims15
An electric actuator comprising:
- a bottom-contained casing;
- a motor in said casing;
- a motor shaft for the motor, extending through an opening of the casing;
- a housing fixed to the opening of the casing;
- a worm on a portion of the motor shaft in the housing;
- a worm wheel rotatably mounted to the housing to mesh with the worm;
- a first radial bearing which supports the motor shaft between an axial end and the worm of the motor shaft;
- a second radial bearing which supports the motor shaft opposite the axial end near the worm;
- and
- a thrust bearing at the bottom of the casing to support the motor shaft.
An electric actuator comprising:
- a bottom-contained casing;
- a motor in said casing;
- a motor shaft for the motor and which extends through an opening of the casing;
- a housing fixed to the opening of the casing;
- a worm on a portion of the motor shaft in the housing;
- a worm wheel rotatably mounted to the housing to mesh with the worm;
- a first radial bearing which supports the motor shaft between an axial end and the worm of the motor shaft;
- a second radial bearing which supports the motor shaft opposite the axial end near the worm;
- a thrust bearing at the bottom of the casing to support the motor shaft;
- a rotary disc which is fixed to the motor shaft to rotate together with the motor shaft;
- a rotation detector for detecting an angle of rotation electrically;
- and
- encoding means for converting the angle of rotation into a digital signal.
Dependencies are inferred from the claim text.