Electro-mechanical linear actuator

Electrical generator or motor structure – Dynamoelectric – Rotary

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Details

310 89, 310 75R, H02K 706, H02K 716

Patent

active

058923098

ABSTRACT:
An electro-mechanical linear actuator including a drive motor, a capacitor, a die-cast gear box, and a drive nut system. The die-cast gear box is capable of receiving multiple drive motor diameters, and the drive motor may be staked to the gear box. A coverless-capacitor is fixed to the gearbox without fasteners, and knock-out plugs are die cast into the gearbox. Integral cord strain reliefs are provided to eliminate the need for plastic bushings. The assembly includes a metal drive key that mates with the drive shaft and an output gear for transmitting torque to the drive shaft. A plastic flange bearing provides bearing surfaces for the drive key and the drive shaft. A high efficiency reinforced self-guided ACME nut travels linearly along the drive shaft. A tight diameter is used on the ACME nut thread form, and a bearing section is provided on its outboard to maximize screw-to-nut alignment. Snap-fit adjustable cams allow easy adjustment of the travel of the drive nut along the shaft via limit switches. A satellite dish actuator assembly provided about the drive shaft includes an outer tube, an inner tube, and a three axis mounting stud. The outer tube may be fastened to cylindrical dust cover wall in the die cast gear box, or secured using a dust cover adaptor. The inner tube is secured to the drive nut using a replaceable tube
ut connector guide that keys the nut to the inner tube while centering them both in the outer tube. The three-axis mounting stud is secured to the end of the inner tube and allows three axis of freedom at low cost.

REFERENCES:
patent: 4719379 (1988-01-01), Daniels et al.

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