Abstract
The duty parameter diagram is a common tool to compare and analyse the lubrication and
friction condition of different radial shaft sealing systems. In addition, it also allows an
evaluation of the suitability of differently manufactured sealing counterfaces. This paper deals
with the influences of different shaft surface structures on the formation of a lubricating film
and a sealing gap. For this purpose, friction torque measurements were carried out, starting
from very low sliding speeds of about 0.0042 m/s (corresponds to 1 rpm at a shaft diameter of
80 mm) up to 10.5 m/s. The aim is to cover the mixed friction area in addition to the liquid
friction area and thus determine the position of the transition point between both friction states.
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