Browse Prior Art Database

Ball Nut Actuator

IP.com Disclosure Number: IPCOM000078815D
Original Publication Date: 1973-Mar-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Johnson, LA: AUTHOR [+2]

Abstract

A ball nut actuator provides a positive drive with a built-in safety override, without relying on a friction drive. The safety override is adjustable and can be set at different values for each of the paths of bidirectional travel.

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Ball Nut Actuator

A ball nut actuator provides a positive drive with a built-in safety override, without relying on a friction drive. The safety override is adjustable and can be set at different values for each of the paths of bidirectional travel.

The ball nut actuator consists of a slider 1, collar 2, six balls 3, two springs 4, two adjustment nuts 5, two spring retainers 6, and a threaded shaft 7.

As the threaded shaft 7 is rotated, the balls 3 transfer the driving force from the shaft to the nut assembly. In this condition, the balls are positively locked in place by the collar 2, which in turn is attached to the object to be moved.

If the actuator motion is opposed by a force greater than the spring preload, the collar moves with respect to the slider 1, compressing a spring 4. In this condition the balls 3 detent out of the shaft thread, resulting in the mechanism being overridden (disengagement of the driving force from the object to be moved). To adjust the safety override force level, the spring preload is changed by turning the adjustment nuts 5.

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