Electrically Driven Linear Actuator

摘要

An electric linear actuator has a screw shaft incapable of rotating with respect to the housing. The screw shaft provides axial movement. A steel sleeve is fit into a bag like housing hole of the housing. A recessed groove is formed on the inner circumference of the sleeve and extends in a shaft direction. A locking pin, applied with metal plating, is inserted into an end of the screw shaft. The locking pin engages the recessed groove. The end of the sleeve is externally fit with a cap. The cap is fit into a base portion of the bag like housing hole of the housing.

主权项

1. An electric linear actuator, comprising:
an aluminum alloy housing; an electric motor mounted on the housing; a speed reduction mechanism configured to transmit torque of the electric motor through a motor shaft; a ball screw mechanism configured to convert rotational motion of the electric motor into linear axial motion of a drive shaft through the speed reduction mechanism; the ball screw mechanism including: a nut rotatably supported through a support bearing mounted on the housing and supported against axial movement, the nut has a helical screw groove formed on its inner circumference, a screw shaft is inserted inside the nut with a plurality of balls between the nut and screw shaft, the screw shaft is coaxially integrated with the drive shaft, the screw shaft has a helical screw groove formed on an outer circumference that corresponds to the helical screw groove of the nut, the screw shaft is supported to be incapable of rotating with respect to the housing, the screw shaft moves axially, a steel sleeve prevents rotation of the screw shaft, the sleeve is fit into a bag like housing hole in the housing, the end of the sleeve is externally fit with a cap, the cap is fit into a base portion of the bag like housing hole of the housing.