Engineering teams building custom Excel calculators or proprietary design software need the exact formulas and empirical lookup tables embedded within the PDF to automate their workflows.
ISO/TR 14179-2 is the second part of a two-part document on gear thermal capacity. While provides calculation methods for thermal behavior of gear units (based on lubricant temperatures and heat balance), Part 2 gives supporting information, examples, and practical guidance on applying the thermal capacity calculations.
: Friction from rolling elements, cages, and inner/outer rings.
Examines the true, variable "quasi-stationary" sump temperature Strictly analytical heat-balance calculation iso tr 14179-2 pdf
Look for "ISO TR 14179-2:2001" (the current stable version as of this writing). Verify the publication date before purchasing.
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Unlike Part 1 of the standard (which is based on American AGMA proposals aimed at a fixed 95 °C equilibrium temperature), originating from theoretical and experimental research at the Technical University of Munich (FZG). It employs an iterative calculation method to establish thermal equilibrium based on the specific power losses and heat dissipation behaviors of individual components. Core Functionality : Friction from rolling elements, cages, and inner/outer
Includes both load-dependent losses (related to tooth friction) and no-load (churning) losses.
For original gear units operating under true field conditions, the document provides testing protocols to measure:
) generated inside a gearbox is calculated as the sum of individual component losses. These are broken down into (which change based on torque) and no-load losses (which occur simply because the parts are moving through fluids). Load-Dependent Gear Power Losses ( PVZPcap P sub cap V cap Z cap P end-sub forced fan cooling
Water-cooled pipes are submerged directly inside the oil sump to absorb heat directly from the source.
Evaluates how natural air movement, forced fan cooling, and housing surface finishes (using the Stefan-Boltzmann law) radiate heat into the ambient air.
Official copies of this 42-page document can be purchased from authorized standard distributors such as the ISO Store , Accuris , or European Standards . Technical Overview of ISO/TR 14179-2
The total power loss inside a gear unit is the sum of several distinct components: Gear Mesh Losses ( PVzcap P sub cap V z end-sub
PL=PLG+PLB+PLS+PLWcap P sub cap L equals cap P sub cap L cap G end-sub plus cap P sub cap L cap B end-sub plus cap P sub cap L cap S end-sub plus cap P sub cap L cap W end-sub PLGcap P sub cap L cap G end-sub