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Review of the Lubrication, Sealing, and Pumping Mechanisms in Oil- and Grease-lubricated Radial Lip Seals by P Baart; P M Lugt; B Prakash is a Engineering article available to read on EtoBox.

What is Review of the Lubrication, Sealing, and Pumping Mechanisms in Oil- and Grease-lubricated Radial Lip Seals about?

Radial lip seals are successfully used since the 1940s to seal lubricated systems. Despite extensive experimental and theoretical research in the field, it is still not fully clear how these seals function. Experimental studies, found in the public literature, show that the relatively high surface roughness of the seal lip is very important for good and reliable performance. In addition, the pressure distribution under the lip seems to be a critical factor. Six fundamental hypotheses are presented on the lubrication, pumping, and sealing mechanisms to explain the working principles of these seals. It is generally accepted that lubrication results from micro-elastohydrodynamic film build up between the rough seal surface and the shaft. Non-symmetrical tangential deformations of the lip surface are observed during experiments and assumed to act like spiral groove bearings that generate a pumping action and lubricant film. Another hypothesis suggests that the lubricant will behave non-Newtonian under the very high shear rates experienced in operating conditions. This will reduce friction because of shear-thinning and enhances sealing. Macroscopic aids, like hydrodynamic pumping aids a

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Author

P Baart; P M Lugt; B Prakash

Publisher

SAGE Publications

Published

2009

Language

EN

Field

Engineering (Physical Sciences)