Iso Tr 14179-2 Pdf Jun 2026

When physical testing is not feasible, Clause 5 and Clause 6 detail mathematical models to predict individual loss and dissipation components. These equations compute total power loss ( PLcap P sub cap L

To offset internal power losses, heat is pushed out through multiple channels:

Not every engineer needs to perform the calculations manually. Many gear sizing software packages (like KISSsoft, MITCalc, or Romax) integrate ISO TR 14179-2. However, you still need to know the :

ISO/TR 14179 consists of two parts under the general title Gears — Thermal capacity .

From Table 3 in ISO TR 14179-2 (heat dissipation for a cast iron housing of 0.8 m² surface area): iso tr 14179-2 pdf

Determine the expected equilibrium oil sump temperature for a given transmitted power level.

Prefers experimental field measurements on original gear units Initial desktop sizing and nominal rating

: Determining power loss and heat dissipation on original gear units under real-world conditions.

In the engineering of industrial gearboxes, thermal rating is often the limiting factor rather than mechanical strength. When gears run at high speeds or under heavy loads, they generate significant heat due to friction and oil churning. If this heat isn't dissipated, the oil temperature can rise to levels that compromise the lubricant’s efficiency and the structural integrity of the gears. When physical testing is not feasible, Clause 5

The benefits of ISO/TR 14179-2 include:

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Instead of hunting for a free, illegal copy riddled with errors, invest in the official PDF from ISO or your national standards body. The cost is negligible compared to a single gearbox failure caused by thermal scoring.

The thermal capacity calculation in ISO/TR 14179-2 revolves around modifying a baseline thermal rating ( Pt0cap P sub t 0 end-sub ) to find the permissible thermal power ( Ptgcap P sub t g end-sub ) for a specific application. 1. Baseline Thermal Capacity ( Pt0cap P sub t 0 end-sub However, you still need to know the :

This article is provided for informational purposes only. For specific compliance and application advice, consult the full official standard text and seek guidance from qualified mechanical engineering professionals.

, titled "Gears — Thermal capacity — Part 2: Thermal load-carrying capacity," is a technical report published by the International Organization for Standardization.

Cast iron and aluminum have different thermal conductivities. Furthermore, adding cooling fins expands the effective surface area, boosting heat dissipation.