Visco-Elastohydrodynamic (VEHD) Lubrication in Radial Lip Seals: Part 1—Steady-State Dynamic Viscoelastic Seal Behavior

[+] Author and Article Information
M. J. L. Stakenborg

SDRC, Druivenstraat 3, 4816 KB Breda, Netherlands

H. J. van Leeuwen

Eindhoven University of Technology, Department of Mechanical Engineering, 5600 MB Eindhoven, Netherlands

E. A. M. ten Hagen

Vredestein Research & Development, 7000 AA Doetinchem, Netherlands

J. Tribol 112(4), 578-583 (Oct 01, 1990) (6 pages) doi:10.1115/1.2920301 History: Received March 31, 1989; Revised July 07, 1989; Online June 05, 2008


In general, most analyses of radial lip seal behavior assume a static deformation state in the seal lip. Nevertheless, a dynamic excitation of the seal lip always occurs in practice, due to unroundness of the shaft or motions of the shaft center. In this first part of a two part paper the influence of dynamic excitation on the occurrence of clearances in a dry seal-shaft contact is studied, taking into account viscoelasticity and inertia of the seal material. The ultimate goal is to determine whether viscoelastic seal behavior can result in a continuous fluid film or not. First, attention is paid to the mechanical behavior of synthetic rubber under an oscillating load. The seal elastomer shows a glass transition, resulting in a strong increase in stiffness with frequency. Next, a FEM analysis of the seal-shaft contact under dynamic conditions is presented. The steady-state response of the seal is represented by a transfer function approach. It is shown that clearances develop due to viscous and inertial seal material behavior. In practice, these clearances are filled with fluid. Due to entrainment and squeeze effects a fluid film is generated. This phenomenon is designated visco-elastohydrodynamic (VEHD) lubrication, and is subject of Part 2.

Copyright © 1990 by The American Society of Mechanical Engineers
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