A STUDY OF THE INFLUENCE OF LUBRICANTS ON HIGH-SPEED ROLLING-CONTACT BEARING PERFORMANCE. PART VI. RESEARCH ON ELASTOHYDRODYNAMIC LUBRICATION ON HIGH-SPEED ROLLING-CONTACTS.
Final rept. May 65-May 66,
BATTELLE MEMORIAL INST COLUMBUS OHIO
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Stress patterns in lubricated rolling-contact elements have been computed from surface pressures and temperatures between pairs of rolling disks, both cylindrical or both crowned, measured by means of evaporated surface transducers. The maximum mechanical shearing stresses computed for both cylindrical and crowned disks proved to be nearly equal to these that would have occurred under static contact, but the calculated depth of those stresses was reduced for cylindrical rollers in dynamic contact. The maximum shear reversals computed for rolling cylindrical disks were noticeably below the corresponding shear differences for the static cases. Local pressure anomalies such as the pressure spike in the one particular case chosen for investigation, did not seem to alter significantly the shear-stress patterns. Thermal shearing stresses do not appear to be a significant portion of the maximum stress, but do dominate over mechanical shearing stresses near the surface of the elements. Since the pressure distributions under lubricated contact seem to be dominated by the Hertz pattern, with only minor differences appearing with changes of lubricant, some reconsideration has been given to film thickness which is known to vary significantly with lubricant. Explanations have been sought for the unexpectedly thin films observed with polyphenyl ether at high rolling speeds. A new organization of non-Newtonian film thickness theory shows fair correlation with film measurements. An alternate theory considering thermal disturbances is being sought. Author
- Lubricants and Hydraulic Fluids
- Machinery and Tools