From the balance between the generated heat in a gear box andthe dissipated heat from the gear case surface the mean value forthe expected lubricant temperature can be evaluated. The maximumoil temperature in a splash lubricated enclosed gear drive hits thetransmittable power. High oil temperatures idluence wear, scuffing,micropitting and pitting load capacity of the gears as weil as thegear oils’ service life.
Experimental investigations of no-load and load dependent gearlosses in cylindrical and bevel gears as a function of lubricanttype and viscosity, load, speed and temperature are reported. Themean value for the coefficient of friction in a gear mesh isevaluated and compared to measurements in twin disk machines. Arating method for gear mesh power loss is derived.
Investigations, using model and actual gear boxes, show theinfluence of radiation, free and forced convection as weil asconduction to the foundation on the heat dissipation from the gearcase surface. The influence of design, size, airvelocity, surfacefinish of the housing, etc., is reported.
The results of such investigations together with accepted ratingmethods for bearing and seal power loss are introduced into acalculation method for the evaluation of the oil temperature in thesump of a gear box. in sample calculations the possibilities aswell as the limits of this thexmal rating method is shown.
- Edition:
- 96
- Published:
- 10/01/1996
- Number of Pages:
- 14
- File Size:
- 1 file , 910 KB
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