Effect Of Misalignment On Rod Lip
Seal Behaviour
Author(s)
B. Pinedo, M. Conte, J. Aguirrebeitia & A. Igartua
Abstract
The most common failure mechanism of pneumatic cylinders is related to wear
of head seals. It usually occurs due to excessive radial loads or vibrations
(dynamic run-out) or as consequence of an incorrect mounting (rod to bore
misalignment). Sealing behaviour has been the object of several analytical and
numerical studies orientated to reproduce actual working conditions but perfect
rod alignment has been often considered.
A tri-dimensional quasi-static numerical model of rod radial misalignment
and its effect on facing seal behaviour is herein presented as a first step of a
study concerning mounting effects on head seal performances. In the specific, a
thermoplastic polyurethane (TPU) rod lip seal has been considered. An analytical
model was also developed considering the characteristics of the rubber-like
material and stiffness variation of the lip seal versus deformation. A non-linear
dependence of stiffness on deformation of rubber-like material was found. A
cross validation between analytical and numerical models is provided.
Keywords: lip seal, rod misalignment, eccentricity, stiffness.
Keywords
lip seal, rod misalignment, eccentricity, stiffness
Related Book
Other papers in this volume
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