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Diaphragm Flexure for Alignment of Pairs of Circular Cylindrical, Coaxial Linear Bearings

IP.com Disclosure Number: IPCOM000045903D
Original Publication Date: 1983-May-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Engwall, MA: AUTHOR

Abstract

The figure illustrates a linear bearing arrangement for guiding a moving member 10 along a linear path in both directions. The arrangement is comprised of two circular cylindrical bearings 13 and 14, each consisting of an outer member A which is rigidly attached to the moving member 10, and an inner member B attached by means of a flat metal diaphragm flexure 30 to a stud 15 mounted to the stationary frame 20. The bearing surfaces may be separated from each other by fluid pressure, either externally provided or self-generated.

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Diaphragm Flexure for Alignment of Pairs of Circular Cylindrical, Coaxial Linear Bearings

The figure illustrates a linear bearing arrangement for guiding a moving member 10 along a linear path in both directions. The arrangement is comprised of two circular cylindrical bearings 13 and 14, each consisting of an outer member A which is rigidly attached to the moving member 10, and an inner member B attached by means of a flat metal diaphragm flexure 30 to a stud 15 mounted to the stationary frame 20. The bearing surfaces may be separated from each other by fluid pressure, either externally provided or self-generated.

In order to minimize the risk for bearing failure due to angular misalignment, the axes of the two members A and B of each bearing should be as nearly collinear as possible. If bearing clearances are very small in non-compliant systems of this kind, it is very difficult to insure the required degree of alignment, both due to limitations in machining accuracy and to distortion of the involved parts over time (originating from thermal strain and material aging). In the disclosed arrangement, the metal diaphragms 30 permit small alignment rotations of the inner bearing members B relative to the outer members A due to alignment torques stemming from the latter. Thus, the axes of the bearing members are brought close to alignment, insuring proper bearing function. The linear stiffness of the diaphragms in a direction perpendicular to the bearing axis is ver...