FRICTION REDUCTION AND IMPROVEMENT OF THE SCUFFING RESISTANCE OF SPIRAL BEVEL GEARS BY A LOW-FRICTION COATING
Journal Title: Tribologia - Year 2014, Vol 254, Issue 2
Abstract
There are many problems in the operation of spiral bevel gears; for example difficult lubrication conditions and high friction between meshing teeth leads to excessively high oil temperature and the risk of scuffing. Thus, the aim of this work was to check whether by the deposition of a thin, hard, low-friction coating on the teeth flanks of spiral bevel gears it is possible to reduce friction and improve scuffing resistance. The tribological experiments were carried out using two tribotesters: T-02U Four-ball testing machine and T-30 Bevel gear test rig. Two types of thin, low-friction coatings were tested. The first one was a-C:H:W. The other one was MoS2/Ti. The coatings were deposited on one or more tested samples (test balls and bevel gears), so the four material combinations were obtained: steel-steel, coating-steel, steel-coating, and coating-coating. For lubrication a commercial, mineral automotive gear oil of the API GL-5 performance level and 80W-90 viscosity grade was used. The results of the four-ball tests show that the a-C:H:W coating deposited on the teeth flanks is much more effective in friction reduction than MoS2/Ti. The deposition of the a-C:H:W coating on the teeth of the spiral bevel gears proves to be very helpful in reducing friction between the meshing gears. The combination of the a-C:H:W-coated pinion meshing the uncoated wheel is the most efficient. Concerning the improvement of the scuffing resistance, two material combinations are the most effective: a-C:H:W-coated pinion meshing the uncoated wheel and the both gears coated.
Authors and Affiliations
Marek KALBARCZYK, Waldemar TUSZYŃSKI, Miguel Angel ESPARZA LASTRA, Jan WULCZYŃSKI, Jerzy MYDLARZ, Bartosz KISER
Keywords
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