The technical guidelines are primarily intended for industrial gear drives operating up to a pitch line velocity of 30 m/s. It accommodates diverse gear configurations, including: Cylindrical spur and helical gears Bevel and hypoid gears Worm gear drives Technical Breakdown: Power Loss vs. Heat Dissipation
Designing wind turbine gearboxes that face variable wind speeds and high thermal loads.
The PDF contains detailed annexes with correction factors for unusual conditions (e.g., dusty environments, high humidity).
) 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 iso tr 14179-2 pdf
and remains a current, confirmed technical report used globally in the gear industry. ISO - International Organization for Standardization calculation example from the report, or do you need help finding a place to purchase the full ISO/TR 14179-2 document
): Oil churning, splashing, and windage losses caused by components rotating through the lubricant and air mix. 2. Calculation of Heat Dissipation
Here is a story of how this document works in the real world. The Story: The Gearbox That Wouldn't Cool Down The PDF contains detailed annexes with correction factors
Gears - Thermal capacity - Part 2: Thermal load-carrying capacity, Published by ISO, 2001-08-01 Go to product viewer dialog for this item.
The PDF document outlines a precise energy balance equation where the heat generated must equal the heat dissipated at steady-state temperature. 1. Calculation of Power Losses (Heat Generation) The total power loss ( PVcap P sub cap V
[ Transmitted Power Input ] │ ▼ ┌──────────────────────┐ │ TOTAL POWER LOSS │ │ (Gear + Bearing + │ │ Seal Friction) │ └───────────┬──────────┘ │ (Generates Heat) ▼ ┌──────────────────────┐ Iterative Balancing │ OIL SUMP TEMPERATURE │ ◄─────────────────────────┐ └───────────┬──────────┘ │ │ (Requires Dissipation) │ ▼ │ ┌──────────────────────┐ │ │ HEAT DISSIPATION │ │ │ (Housing + Shaft + │ │ │ External Cooling) │ │ └───────────┬──────────┘ │ │ │ └─► Is Thermal Equilibrium Reached? ───┘ Individual Components of Power Loss ( PVcap P sub cap V Load-Dependent Gear Power Losses ( PVZPcap P sub
The American Gear Manufacturers Association has published (Effect of Lubrication on Gear Surface Distress), which addresses some aspects of thermal behaviour in gears, but there is no direct AGMA equivalent to ISO/TR 14179‑2. For projects requiring compliance with AGMA standards, engineers should refer to AGMA standards for gear rating (AGMA 2001, AGMA 2101) and consult AGMA 925 for lubrication effects, while using ISO/TR 14179‑2 for thermal capacity calculations.
The advantage of this approach is : it reflects the actual behaviour of the specific gear unit. However, it requires a test rig and a physical prototype.