Self Contained Bearings for Special Applications – Three Case Studies

Abstract

This paper discusses some of the methods available for the circulation of oil in self-contained bearings and their cooling. Three specific designs are considered and used to illustrate how both standard and very special requirements can be satisfied. Previous and current standard range vertical thrust and guide bearings are described as well as recent innovatory design work concerning the use of heat pipes for oil cooling and the development of a unique self-pressurised low power loss bearing.

Introduction

The objective for designers of self contained bearings is to supply a product to a performance specification which is able to provide itself with a continuous supply of cool oil for the bearing surfaces. The bearing has to be able to carry out from within its own engineered resources the functions of circulating and cooling an amount of oil fixed within the confines of the bearing. There are a range of techniques available to assist in fulfilling these functions. Oil circulation is often achieved for example by fixed or loose rings dipping into the sump and conveying oil from these to the top of the bearing. In many cases water is available as a cooling medium and may be introduced into the bearing casing using suitably designed cooling tubes.

In this paper a number of methods useful in self-contained bearings are discussed with reference to three specific design case studies. These designs have been chosen to illustrate some of the range of ideas available to meet standard requirements and also how it is possible with new design thinking to accept very special duties.