FEATURE SPONSOR
517. Part 3 of this standard defines the requirements for gear oils that are exposed to high loads. In addition to the usual tests on viscosity, pour point, foaming characteristics, steel and copper corrosion, the scuffing load characteristics of the oils are determined in the FZG (Gear Research Centre) scuffing load test.
DIN 51 517, Part 3, stipulates a
scuffing load stage greater than 12 for gear oils. Because gear oils should also be suitable for lubricating the rolling bearings in the gearbox, the standard DIN 51 517, Part 3, also contains the FE 8 rolling bearing test rig developed by the rolling bearing manufacturer FAG. The FAG FE 8 test rig can be used to assess the anti-wear properties of the oil and its effect on the rolling bearing service life. In this test, the wear of the rolling elements should not exceed 30 mg. The assessment of gear oil performance for wind turbines also includes tests that measure scuffing load resistance and micro-pitting resistance.
A test developed by FZG, measures anti-wear properties of the lubricant at low gear speeds, as the planetary gear stage is run at the lowest speed. In this test, better performing lubricants
OILS & LUBRICATION
fall within the low wear category. Gear efficiency is determined to a large extent by the friction characteristics of the lubricating oil.
REDUCING TEMPERATURES
The friction coefficients of different base oils can be seen in the result of the FZG test rig. Today’s gear oils can reduce
temperatures by as much as 68 degrees F (20 degrees C) and power losses by as much as 18 percent when compared to standard gear oils. Cutting power loss leads to more power being delivered to the rotor, and increasing profits simply by increased performance of the lubricant.
Klueber Lubrication
www.windenergynetwork.co.uk
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