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Self Adjusting Ball Bearing Nut for Use on Lead Screw

IP.com Disclosure Number: IPCOM000080414D
Original Publication Date: 1973-Dec-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Kiesewetter, JA: AUTHOR

Abstract

The self-adjusting ball bearing nut assembly is comprised of two ball bearing nuts 2 and 3 mounted on lead screw 1. Ring 5 is attached to ball bearing nut 2 and ring 6 is attached to ball bearing nut 3. Ball bearing nut 3 further has attached to it mounting ring 4. Mounting ring 4 attaches to the item to be moved by the lead screw mechanism.

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Self Adjusting Ball Bearing Nut for Use on Lead Screw

The self-adjusting ball bearing nut assembly is comprised of two ball bearing nuts 2 and 3 mounted on lead screw 1. Ring 5 is attached to ball bearing nut 2 and ring 6 is attached to ball bearing nut 3. Ball bearing nut 3 further has attached to it mounting ring 4. Mounting ring 4 attaches to the item to be moved by the lead screw mechanism.

A thrust bearing 8 is inserted between ball bearing nuts 2 and 3 for the purpose of providing friction-free rotation.

Rings 5 and 6 have extending arms which overlap on two sides of the ball bearing nuts 2 and 3. Ball plunger 7 is mounted through ring 6 so as to exert pressure on the extended arm from ring 5. There is another ball plunger connected in the same manner on the opposite side of the mechanism, not shown. The ball plungers allow the adjustment of the stiffness and torque characteristics of the entire assembly. The action of the ball plungers is such as to control the effective spacing between ball nuts 2 and 3, thereby providing a means for compensating for wear due to friction on the threads of the lead screw.

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