Electric linear actuator
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United States of America Patent
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Apr 25, 2017
Grant Date -
Aug 28, 2014
app pub date -
May 15, 2014
filing date -
Nov 16, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
An electric linear actuator has a housing with an electric motor, a speed reduction mechanism and a ball screw mechanism. The ball screw mechanism converts the rotational motion of the electric motor to an axial linear motion of a drive shaft. The ball screw mechanism has a nut and a screw shaft. The screw shaft is inserted into the nut, via a large number of balls. The screw shaft is axially movably supported on the housing but is non-rotatable with respect to the housing. An output gear, forming part of the speed reduction mechanism, is secured on the nut. The bearings are arranged at either side of the output gear. The bearings are mounted on the housing, via a ring-shaped washer, formed from an elastic member.
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