BS ISO/TR 14179-1:2001

Foreword
Introduction
1 Scope
2 Symbols and units, term and definition
3 Rating criteria
4 Service conditions
  4.1 Intermittent service
  4.2 Adverse conditions
  4.3 Favourable conditions
5 Methods for determining the thermal rating
6 Method A - Test
7 Method B - Calculations for determining the thermal
  power rating, P[T]
  7.1 Basis
  7.2 Heat generation
  7.3 Bearing power loss, P[B]
  7.4 Mesh power loss, P[M], spur and helical gears
  7.5 Mesh power loss, P[M], bevel gears
  7.6 Mesh power loss, P[M], cylindrical worm gears
  7.7 Mesh power loss, P[M], double enveloping worm gears
  7.8 Oil seal power loss, P[S]
  7.9 Gear windage and churning power loss, P[W]
  7.10 Bearing windage and churning power loss, P[WB]
  7.11 Oil pump power loss, P[P]
  7.12 Heat dissipation, P[Q]
8 Modifications for non-standard operating conditions
Annex A (informative) Bevel gear mesh and gear windage
        power losses
Annex B (informative) Worm gear mesh power losses
Bibliography

Gives an analytical heat balance model to provide a means of calculating the thermal transmittable power of a single- or multiple-stage gear drive lubricated with mineral oil.

This part of ISO/TR 14179 utilizes an analytical heat balance model to provide a means of calculating the thermal transmittable power of a single - or multiple-stage gear drive lubricated with mineral oil. The calculation is based on standard conditions of 25 °C maximum ambient temperature and 95 °C maximum oil sump temperature in a large indoor space, but provides modifiers for other conditions.