Separation of Lubrication and Cooling in Oil-Jet Lubricated Gears


Results from tests on a high-speed back-to-back stand (vt = 70 m/sec = 13725 ft/min) show the influence of the separation of lubrication and cooling oil supply on gear temperatures (scuffing load capacity) and efficiency. The gear mesh is only given the minimum oil flow rate necessary for lubricating the working tooth flanks. Cooling is provided by spraying oil onto the inner surfaces of the rims. This leads to a reduction of up to 60% of the total oil flow rate compared to currently recommended flow rates. In spite of the reduced total oil flow rate the temperature level of the gears can be kept low while the efficiency slightly increases due to reduced hydraulic losses in the gear mesh.
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