Calculating thermal limits where ambient engine room temperatures are exceptionally high. How to Access the Official ISO/TR 14179-2 PDF
Determining the heat generated by gears (churning, friction, seals).
The total power loss is the sum of losses from three main sources:
: It outlines how to measure power loss and heat dissipation on actual gear units under real-world conditions. iso tr 14179-2 pdf
ISO/TR 14179 consists of two parts under the general title Gears — Thermal capacity .
| Parameter | Description | Why it matters | | :--- | :--- | :--- | | | Temperature around gearbox | Lower ambient = more thermal capacity | | Altitude | Above sea level | Reduced air density reduces cooling | | Type of lubrication | Splash, forced, or oil-mist | Affects churning losses | | Housing design | Cast iron vs. aluminum | Aluminum dissipates heat better | | Service factor | Duty cycle (continuous vs. intermittent) | Intermittent duty allows peak overload |
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. ISO/TR 14179 consists of two parts under the
Ensuring large, continuous-duty drive systems do not overheat in dusty, stagnant underground environments.
Once you master the calculations in ISO TR 14179-2, you will never again specify an under-cooled gearbox. You will know precisely how many square meters of housing surface area (or cubic meters per hour of cooling air) your machine truly needs.
Determine thermal load-carrying capacity via measurement and calculation. intermittent) | Intermittent duty allows peak overload |
Friction within rolling-element or hydrodynamic bearings, heavily influenced by applied axial/radial forces, speed, and local oil distribution.
During the gearbox design phase, ISO/TR 14179-2 allows engineers to calculate thermal limits before a single prototype is built. By iteratively solving the thermal equilibrium between heat generated and heat dissipated, designers can optimize housing geometry, select appropriate cooling methods, and avoid costly redesigns.