Bevel gears lubricating

For highly loaded spur, helical, worm and bevel gears, lubricants containing tribological additives such as sulphurized and phosphorus-containing additives are used. These provide excellent anti-wear and extreme pressure protection over a wide range of conditions. 

API GL-4. Lubricants intended for axles with spiral bevel gears operating under moderate to severe conditions of speed and load or axles with hypoid gears operating under moderate speeds and loads. These oils may be used in selected manual transmissions and transaxle applications, where API MT-1 lubricants are unsuitable. 

Common Materials. Gears may be made of a wide range of materials that may be ferrons, nonferrous, and nonmetallic. For indnstrial applications of spnr, helical, and bevel gears, steel is most commonly used, with iron and other metals occasionally nsed. Wormgear pairs generally are made up of bronze or iron for the wormwheel and steel for the worm. Use of plastics is generally limited to light applications, particnlarly those in which minimal lubrication is available. 

When selecting a lubricant, both the temperature at the contact area and the ambient temperature at important factors to be considered. Measuring the peak contact temperature is very difficult. The maximum rise in temperature of the oil leaving the gears and the maximum oil temperature are specified for various types of gears. For spur, bevel, helical and spiral level gears, the temperature rise should not normally exceed 30°C (86°F) with a maximum oil temperature of70°C (158°F). 

Table 52.5 Lubrication of industrial enclosed gear drives. AGMA Lubricant Number recommendations for helical, herringbone, straight bevel, spiral bevel and spur ...

---