MINIMUM-OIL-FLOW REQUIREMENTS OF HIGH-SPEED BALL BEARINGS AT TEMPERATURES TO 800 ° F

摘要

A total of 58 minimum-oil-flow tests were run on eight pairs of 75-millimeter-bore 215-size M-2 tool-steel deep-groove ball bearings at DN val¬ues (product of bearing bore in mm and speed in rpm) ranging from 0.45X106 to 1.2X106 and thrust, loads of 1000, 2000, and 3000 pounds. The bearings were air-oil-mist lubricated with highly refined naphthenic mineral oil (ML0 7243). Tests were run under two general conditions:(1) with no external heat flow to the bearings and (2) with external heat added to maintain constant bearing tempera¬tures of 400°, 500°, 600°, 700°, and 800℉.nMinimum required oil flow for continuous bearing operation increased with increasing DN and load.