Frictional losses in gear boxes are of significant interest togear box designers as these losses transform into heat. The directresult is a reduction in the fuel efficiency of the vehicleinvolved. Further, in many instances, this heat has to be absorbedand dissipated so that lubricant properties and gear boxperformance are not significantly compromised. This effort is tomeasure and document the comparative friction losses in a gear meshdue to gear tooth surface condition and lubricant. Three distinctsurface conditions are considered. They are ground, IsotropicSuperfinished (REM ISF®) and tungsten-incorporated diamond-likecarbon coating (W-DLC). Two lubricants, MIL-PRF-23699 and Mobil SHC626 lubricants are considered. The experimental effort is conductedon a high speed, power re-circulating (PC), gear test rig, whichhad been specially instrumented with a precision torque transducerto measure input torque to the 4-square loop. The torque requiredto drive the loop is measured under various speeds and tooth loadswithin the torque loop, with test gears with different surfaceconditions and with different lubricants. Two operating torquelevels within the 4-square loop at speeds ranging from 4,000 rpm(pitch-line velocity of 19 m/sec) to 10,000 rpm (pitch-linevelocity of 47 m/sec) are evaluated. Based on the collected data aqualitative analysis of the effect of gear tooth surface conditionon frictional losses is presented. Further, the surfacecharacteristics of the tooth flanks of the ground, superfinishedand coated gears are also described.
- Edition:
- 14
- Published:
- 10/01/2014
- Number of Pages:
- 9
- File Size:
- 1 file , 750 KB
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