Errichello, R., "Lubrication of
A Gears, Part I," Lubrication
Engineering, pp 11-13, Jan., 1990Errichello, R., "Lubrication of
Gears, Part 2," Lubrication
Engineering, pp 117-121, Feb. 1990. Fitzsimmons, B. and Clevenger, H. D.,
"Contaminated Lubri
适用范围
For gear systems and rolling element beatings, there are similar designations for the failures that are identifiedwithin
their respective contact surfaces. By concentrating on the contact tribo-system, it is possible to go beyond the
appearance and determine the mechanisms that promote or prevent contact fatigue damage.
It is also important to identify the lubricant regime withinthe contact. This can be donewith the modifiedlambda ratio.
This is a ratio of the central film thickness occurring within a contact divided by the composite roughness of the two
surfaces forming the contact, the roughness being modified to match the contact width occurring in the direction of
motion
The contact fatigue modes are identifiedover arange of modified lambda values. An attempt is made to describe the
failure modes and interpret the wear,fracture and/or fatiguemechanisms that lead to the failure initiation. Considering
the similarity in appearance of the gear and bearing failure modes and yet the considerablydifferent relative surface
motions and _aetions of the twocontacts, this comparison helpsprovide insight into thebasic causes of the failures and
perhaps suggests methods to avoid them.