Electric linear actuator with planetary action

Details Electric linear actuator with planetary action Electric linear actuator with planetary action

Filed on

1993-09-22

Date issued

1996-02-13

Examiner

Wong, Peter S.

Patent Class

Electrical generator or motor structure

SubClass

Dynamoelectric

SubSubClass

Rotary

Other Related Categories

H02K 706, H02K 710

Type

Patent

Status

active

Patent number

054913721

Description

ABSTRACT:
The present invention provides an electrically powered linear actuator including an actuator assembly (having an actuator rod and a thread engaging portion), a motor assembly (having a stator) and a housing assembly. An elongated cylinder formed of a magnetic material is rotatably supported relative to the housing assembly. Magnets or other elements are mounted about an outer circumference of the cylinder to form an armature within the motor assembly. The elongated cylinder of the armature further includes an internally threaded bore. The thread engaging portion of the actuator assembly is moved along the threaded extent of the cylinder on rotation of the cylinder. Thus, the cylinder functions as an armature drive cylinder. The stator is selectively energized to rotate the armature drive cylinder clockwise or counterclockwise to reciprocally move the thread engaging portion of the actuator assembly and the output shaft. The threaded bore of the cylinder is significantly longer than the thread engaging portion of the actuator assembly such that the difference therebetween defines an actuation stroke for the device.

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Abstract for Patent No. 55-123382, Japan, dated Sep. 1980.

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