Browse Prior Art Database

Bearing Testing System

IP.com Disclosure Number: IPCOM000044325D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 3 page(s) / 60K

Publishing Venue

IBM

Related People

Brue, BM: AUTHOR [+2]

Abstract

This article describes a bearing test system to test bearings in a similar environment for functioning in a disk file where two sensors are positioned at a perpendicular angle about the bearing in the tester for measurement of inner race radial motion and definition of non-repeatable runout. The bearing motion generates spectral data where autospectrum variable peaks of the two sensors are utilized to determine a bearing index. Bearing testers have measured bearing quality by prior-art methods, such as a device where a bearing without grease is spun by hand on a spindle and vibration is measured. Another method is an anderometer which spins the inner race of a preloaded ball bearing and a radial vibration of an outer race is measured in frequency bands.

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Bearing Testing System

This article describes a bearing test system to test bearings in a similar environment for functioning in a disk file where two sensors are positioned at a perpendicular angle about the bearing in the tester for measurement of inner race radial motion and definition of non-repeatable runout. The bearing motion generates spectral data where autospectrum variable peaks of the two sensors are utilized to determine a bearing index. Bearing testers have measured bearing quality by prior-art methods, such as a device where a bearing without grease is spun by hand on a spindle and vibration is measured. Another method is an anderometer which spins the inner race of a preloaded ball bearing and a radial vibration of an outer race is measured in frequency bands. A further method is to mount a non-contact sensor to measure radial motion of an outer race which is not rotating where the sensor signal is analyzed for frequency content. Maximum amplitude of the harmful frequencies is recognized by a bearing specification. The bearing test system 1 (Fig. 1) utilizes two sensors 2 and 3 placed at a perpendicular angle with respect to each other about a rotating sensor disk 12 of a bearing tester 11 of Fig. 2. The sensors connect to an amplifier 4 which is in series with notch filter 5, spectrum analyzer 6, and controller 7. The controller calculates a bearing index 8 which provides either a bearing accept signal 9 or a bearing reject signal 10. Spectral data generates from the sensors 2 and 3 the bearing index which is a single-value representation of the bearing quality. The non-repeatable signal components from the sensors are added algebraically to simulate a worst-case in-phase condition where the square root of the sum of the square is determined for simulating the worst run out in any direction. The bearing index has physical significance in that it represents the worst possible P- P nonrepeatable radial run out of the bearing under test. The bearing index is stated by the following equation:

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where An = O-P amplitude of all nonrepeatable autospectrum peaks from Sensor A with a peak value > 0.25 microinch. Bn = Same as A, but for sensor
B. Repeatable peaks are defined as autospectrum peaks at mx RPM...