Iso Tr 14179-2 Pdf (2025)
Pro tip: If you are just learning, consider purchasing the ISO TR 14179-2 pdf as a bundle with ISO 6336 (gear strength calculations) – it is often discounted.
The standard breaks down losses into:
Many beginners confuse this standard with others. Here is a quick comparison:
| Standard | Focus | What it Calculates | | :--- | :--- | :--- | | ISO 6336 (Parts 1-6) | Tooth bending and contact fatigue (pitting resistance) | Gear life in hours (mechanical strength) | | ISO TR 14179-1 | Scuffing (micro-welding) | Load limit before adhesive wear | | ISO TR 14179-2 | Thermal capacity | Maximum continuous power without overheating | | AGMA 925 A03 | Thermal rating (American standard) | Similar to ISO TR 14179-2 but with different constants | iso tr 14179-2 pdf
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.
The document utilizes methods to calculate the integral temperature of the gear tooth. This combines the bulk temperature of the gear body with the flash temperature rise. If this calculated temperature exceeds the "Scuffing Temperature" (which depends on the oil and material), the gear is deemed unsafe.
A common point of confusion is the difference between Part 1 and Part 2 of ISO TR 14179. Pro tip: If you are just learning, consider
| Aspect | ISO TR 14179-1 | ISO TR 14179-2 | | :--- | :--- | :--- | | Title | Thermal capacity based on oil temperature | Thermal load-carrying capacity | | Focus | Calculating the equilibrium oil temperature | Calculating the maximum power before thermal failure | | Primary output | ( T_oil ) (deg C) | ( P_th ) (kW) | | Use case | Predicting oil life and viscosity breakdown | Sizing a gearbox for a specific power level |
In practice: You need both parts. Part 1 tells you how hot the oil will get. Part 2 tells you how much power you can safely transfer given that heat.
Engineers search for the "ISO TR 14179-2 pdf" for several practical reasons: The standard breaks down losses into: Many beginners
Important Note: Because this is a Technical Report (not a full International Standard), it is less prescriptive but more explanatory. It offers calculation methods rather than pass/fail criteria, which is why engineers need the original PDF to interpret the nuances.
Manually calculating thermal capacity with the PDF is tedious. Most modern gear design software includes this standard:
If you are a freelance engineer, you can build your own Excel calculator using the equations from the ISO TR 14179-2 PDF, but verify your model against Annex A.
A: No. This report is for steel gear drives with continuous lubrication. Plastic gears have entirely different thermal properties.