The standard provides methods for calculating housing surface area contributions, accounting for factors like free versus forced convection, and evaluating the impact of thermal finning on heat rejection.
is the definitive international technical report governing how mechanical engineers calculate and measure the thermal load-carrying capacity of gear units . As modern industrial gearboxes pack higher power densities into shrinking footprints, managing heat dissipation has become just as critical as managing mechanical strength. Operating a gearbox beyond its thermal rating degrades lubricants, destroys seals, and triggers catastrophic gear failure.
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 14179-2 pdf
Synthetic oils (like polyalphaolefins or polyglycols) generally feature lower friction coefficients than mineral oils, directly reducing gear mesh losses ( PVzcap P sub cap V z end-sub
For splash-lubricated gear units—those where gears dip into an oil bath to distribute lubricant—the standard prescribes a method for determining the . This approach is particularly relevant for industrial gearboxes where oil temperature serves as a key indicator of thermal health. Operating a gearbox beyond its thermal rating degrades
While (ISO/TR 14179-1) is based on an American proposal (AGMA) focused on a fixed 95 °C sump temperature, Part 2 is based on a German proposal that utilizes a more flexible iterative heat balance model. Go to product viewer dialog for this item.
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: The physical displacement of oil out from between root spaces as the teeth mesh. Bearing Power Losses ( PVLcap P sub cap V cap L end-sub
ISO/TR 14179-2 is a , not a full international standard. It sits within the broader ISO 14179 series, which addresses the thermal capacity of gears. Part 2 specifically focuses on thermal load-carrying capacity —in other words, how much power a gear unit can safely transmit without exceeding its thermal limits under real-world operating conditions.
Calculate the maximum power a gearbox can safely transmit without exceeding its maximum allowable oil sump temperature.
| | Relationship | | :--- | :--- | | ISO/TR 14179-1:2001 | Part 1 focuses on rating gear drives with thermal equilibrium at a 95°C sump temperature. Part 2 complements this by providing more detailed measurement and calculation methods. | | AGMA 947-A23 | The American Gear Manufacturers Association standard on thermal capacity explicitly adopts the tooth friction calculation method from ISO 14179-2. | | ISO 10300-1 | For bevel gears, ISO 14179-2 references ISO 10300-1 methods for certain friction calculations. | | BS ISO/TR 14179-2:2001 | The identical British Standard version. | | DIN 3990 | The German standard on gear capacity, alongside ISO 14179, cited as a basis for thermal rating. |