Tri-dimensional eccentricity model of a rod lip seal

In this work, an analytical tri-dimensional eccentricity model of a rod lip seal is presented. In the specific, a thermoplastic polyurethane (TPU) rod lip seal was considered. The analytical model was completed and adjusted by means of numerical results. Experimental tests on selected seals were carried out on a suitable test rig designed to measure reaction forces on seals as a function of rod misalignment. A cross validation between the analytical model and experimental results is provided. The model is used to calculate the contact force distribution on a seal when it is subjected to an eccentric mounting. •A method to develop tri-dimensional eccentricity models of rod seals is presented.•The model is completed and adjusted by means of numerical 2D and 3D results.•The model is based on a geometrical interference model and contact equations.•Rod misalignment tests on commercial seals were carried out to validate the model.•The method could be a viable tool to calculate contact force distribution on seals.