The Impact of Surface Condition and Lubricant on Gear Tooth Friction

The experimental effort is conducted on a high speed, power re-circulating (PC), gear test rig, which had been specially instrumented with a precision torque transducer to measure input torque to the four-square loop.  The torque required to drive the loop is measured under various speeds and tooth loads within the torque loop, with test gears with different surface conditions and with different lubricants.  Two operating torque levels within the four-square loop at speeds ranging from 4,000 rpm (pitch-line velocity of 19 m/sec) to 10,000 rpm (pitch-line velocity of 47 m/sec) are evaluated.

Input torque measurements, as measured by the precision torque transducer, on ground test gears operating in MIL-23699 lubricant are used as a base line.  The increase or decrease in the input torque to the four-square loop is a measure of the change in friction losses at the test gear mesh due to changing surface condition, tooth load and or lubricant.  Based on the collected data, a qualitative analysis of the effect of gear tooth surface condition on frictional losses is presented.  Further, the surface characteristics of the tooth flanks of the ground, superfinished and coated gears are also described.  Plans for future work, to obtain a quantitative measure of the effective coefficient of friction at the tooth surface, are also propose

Copyright © 2014

American Gear Manufacturers Association

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