Abstract
Radial lip seals are a common seal type for various industrial applications.
In retarder breaking systems for commercial vehicles, radial lip seals are
exposed to very fast changing oil sump temperatures. Due to increasing
demands, the elastomer seals are increasingly failing premature in such
applications. It is assumed that this is caused in particular by the very high
temperature gradients, that result from the fact that a lot of braking power
is dissipated within a short time. This is the case, for example, when braking
while driving downhill with heavy loads. Since the temperature gradient is
of minor importance in many applications, there are no publications
regarding the specific influence of high temperature gradients on the
function of radial shaft seals. Therefore, a test rig with advanced heating
and cooling capacities is developed.
A comprehensive test series is carried out, with the main focus on the
influence of high temperature gradients on the wear behavior of the seals.
Test results show, that different temperature levels lead to a significant
change of the wear behavior. Additionally, fast changing temperatures are
adding additional tribological stress to the sealing system.
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