Ball joint with dynamic preload adjustment

Details Ball joint with dynamic preload adjustment Ball joint with dynamic preload adjustment

1990-04-30

1991-10-01

Kundrat, Andrew V.

Joints and connections

With indicator or inspection means

403142, 403141, B25G 300

Patent

active

050528440

ABSTRACT:
A ball joint can dynamically alter the preload between the cones and the ball of the ball joint to desired levels. When the stage or other device is in motion, the preload can be reduced to provide low friction and wear. When the stage or other device is not in motion, then the preload can be increased to provide zero backlash and high stiffness. The ball-type pivot joint with dynamic preload adjustment includes a ball and a pair of cones which are dynamically preloaded by servo (feedback) control of a preload actuator. Alternate designs are limited by manufacturing and assembly tolerances as well as wear of bearing surfaces or are subject to change due to thermal fluctuations. A flexible member provides flexure of the bearing members in response to the preload actuator.

REFERENCES:
patent: 852872 (1907-05-01), Collins
patent: 2242215 (1941-05-01), Johnson

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