Patent ID: 9273766
Filing Date: 2016-03-01
CPC Classification: F16H,H02K,Y10T

Claim Text:
1. An electric actuator comprising: a housing; an electric motor mounted on the housing; and a speed reduction mechanism for transmitting the rotational power of the electric motor to a ball screw mechanism, via a motor shaft, the ball screw mechanism adapted to convert the rotational motion of the electric motor, transmitted via the speed reduction mechanism, into an axial linear motion of a drive shaft; the ball screw mechanism includes a nut connected to the speed reduction mechanism and supported so that it can be rotated relative to the housing via a rolling bearing mounted on the housing but cannot be axially moved, a threaded screw shaft, inserted in the nut via a large number of balls, is coaxially integrated with the drive shaft; the housing is formed with a cylindrical blind bore to contain the drive shaft in the cylindrical blind bore, a side-cover is detachably mounted to the housing; a guide member is mounted on the inner wall of the side-cover, the guide member has a substantially “C”-shaped cross-section and is formed with a recessed groove axially extending opposite to the drive shaft; and a rotation-preventing pin, mounted on the outer circumference of the threaded screw shaft is engaged, with the guide member so as to support the threaded screw shaft so that it can be axially moved relative to the housing but cannot be rotated.