Gear
oil is a very thick, rated at 80 to 100 weight density and is used in
the enclosed units containing gears. Some industrial gear oil contains
sofisticated high pressure ingredients and they are multigrade
lubricants. The thickness of the gear oil
should be high to protect the gear teeth. The density of the thickness
is based on the requirement of the application. The oil enables to
maintain a differential viscocity over the operating gearboxe. This
small viscocity differential provides a consistent lubricating film to
the gear and more predictable wear performance. It performs multiple
functions like prevents rust and corrosion, helps heat transfer,
minimize friction wear etc. It also contain components to decrease oil oxidation, inhibit foaming and separate water readily. There are different standardization's to define the quality of the gear oil. There is an established viscocity measuremnt which is certified globally. The viscocity is measured in centistokes at 40 degree C & 100 degree C temperatures.
Synthetic fatty oil is blended with base oil to provide high lubricity and it helps in sliding motion under high pressure. The open gears are protected by gear oil which also contains anti-wear component. The commonly used oils are 75W90, 80W90, and 85W140. Mineral based gear oils are being used in various industries, this helps in preventing the engine from start up wear tear. Gear oil should be kept carefully to prevent from contamination.