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Transducer for Measuring Radial Bearing Loads

IP.com Disclosure Number: IPCOM000090062D
Original Publication Date: 1969-Jan-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Werner, JM: AUTHOR

Abstract

Transducer 10 has axial bore 11 and four legs 12. These are radially oriented with respect to the axis of bore 11 and are disposed mutually perpendicular to each adjoining leg. Leg surfaces 14 form portions of a common cylindrical surface. A series of strain gages 21...28 is mounted on legs 12. Each is centered with respect to the thickness of leg 12, to which it is adhered, to prevent transducer 10 from being sensitive to bending or axial loads exerted by a shaft received in bore 11.

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Transducer for Measuring Radial Bearing Loads

Transducer 10 has axial bore 11 and four legs 12. These are radially oriented with respect to the axis of bore 11 and are disposed mutually perpendicular to each adjoining leg. Leg surfaces 14 form portions of a common cylindrical surface. A series of strain gages 21...28 is mounted on legs 12. Each is centered with respect to the thickness of leg 12, to which it is adhered, to prevent transducer 10 from being sensitive to bending or axial loads exerted by a shaft received in bore 11.

To determine a specific bearing load, transducer 10 is formed with substantially the same interior and exterior dimensions as the bearing. The outer diameter defined by surfaces 14 is slightly larger than the bore housing the bearing. Transducer 10 is cooled and inserted into the bore to effect a force fit when such transducer is restored to the ambient temperature. Use of a transducer having a high coefficient of thermal expansion in a housing having a lower coefficient of thermal expansion permits insertion of the transducer into the cooperating bore with both parts at a common reduced temperature.

This is in contradistinction to attempting to maintain the transducer at a lower temperature than the associated housing material as would be necessary when using the same materials or materials with similar coefficients of thermal expansion. The preload established by the force fit must be maintained to prevent calibration change. To determ...