If you only calculate mechanical strength (ISO 6336) but ignore thermal capacity, your gearbox may be mechanically sound but will burn up in the first hour of continuous use. We must discuss a critical point: Copyright and legality.
If you have been searching for the "ISO TR 14179-2 pdf," you are likely looking to understand how to calculate gearbox thermal ratings, or you need the official standard for a compliance project. This article provides a deep dive into what this standard contains, why it matters, how to access it legally, and how to apply its formulas to real-world machinery. ISO TR 14179-2 is a Technical Report (TR) published by the International Organization for Standardization (ISO). Its full title is: "Gears – Thermal capacity – Part 2: Thermal load-carrying capacity." iso tr 14179-2 pdf
Introduction In the world of mechanical power transmission, gears are the unsung heroes. However, one of the most common failure modes in high-speed or high-load gearboxes isn't broken teeth—it is thermal failure . When a gearbox runs too hot, lubricants break down, clearances close up, and scoring occurs. If you only calculate mechanical strength (ISO 6336)
The standard guides you to add a cooling fan (increasing k to 35 W/(m²·K)) or increase housing fins. This article provides a deep dive into what
Dissipation capacity = ( k \times A \times \Delta T ) = 12 × 2.5 × (80-30) = 1,500 W (1.5 kW).
Use the formulas in Clause 5 of the PDF. Assume mesh efficiency = 98% → Loss = 3 kW.
To prevent this, engineers rely on a critical technical document: .