Abstract
Calculated temperature flash and oil-film thickness give guidance on scuffing tendency and the need, or otherwise, of surface treatment for the initial protection of high-speed gear teeth. Appropriate quantities of lubricant must effectively wet gears to maintain their design working temperatures and efficiencies. In such conditions, lubricant jet velocities are important. Excessive churning of lubricant at high speed causes high temperatures. Drainage system designs must ensure that adequate clearance is maintained between sump liquid surface and gears. Noise and vibration can be minimized by controlling the accuracy of critical elements. Monitoring of vibration, and also lubricant temperature and pressure, is advisable. It is emphasized that maintenance is simple if the warning signs are recognized.
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