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Autori: Zidaru, I., Ripeanu, R.G., Tudor, I., Drumeanu, A.C.
Editorial: Ed. University of Belgrade, FME Transactions, 37, p.99-102, 2009.
Sliding bearings in three cone bits are lubricated in heavy conditions. To
improve tribological behavior, samples of bearings materials were made
with implants of antifriction materials with different rapport between
implant and free base material in the presence of different greases.
Antifriction material has a greater dilatation coefficient than base
material. If the implant dimension is too small, the solid lubricant
capability to cover the base material does not enssure a proper friction
coefficient. If the implant dimension is too great the external load could
not be supported. On Amsler A135 the proper implant rapport, measuring
friction coefficient and wear were established. The behavior of the greases
containing PTFE was also established. In a second phase of the tests a
device for testing three cone bits bearings at real axial loads was designed
and realized. With SPIDER 8 device and inductive traducers we
established the friction coefficients and the temperature on friction surface,
depending on implants dimensions and grease lubricant type.
Cuvinte cheie: three cone bits bearings, friction coefficient, temperature