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Fundamentals of Design and Technology of Rolling Element Bearings

Chinese Journal of Aeronautics 2010年第1期23卷 123-136页

作者： franz-josef ebert FAG Aerospace GmbH & Co.KG D-97421 SchweinfurtGermany

This article presents an overview of fundamentals of rolling element bearing designs and technologies. The aim is to outline the complex interrelation of all fundamentals with the rolling contact fatigue and the attainable bearing life. Such fundamentals include, amongst others, bearing stressing and life capability. The article shows the different types of rolling bearing stressing and the analysis of the stress distribution （principal stresses and equivalent stresses） in the material under the rolling contact area. It becomes obvious that the contamination of the bearing with foreign particles leads to a drastic reduction in bearing life. Furthermore, it demonstrates the impact of the bearing lubrication and coating as well as the effect of additives on the attainable life and wear. Further fundamentals of rolling element bearing de- sign are the materials, the material cleanliness and the heat treatment. The article reveals the importance of the clean- liness of bearing steels as well as different types of inclusions and their effect on rolling contact fatigue. Additionally the article describes how to optimize the material properties （strength, toughness and residual stress） by the heat treat- nlent processes. The outcome of these investigations is that endurance life of a rolling element bearing can be achieved if specific operating conditions, an adequate lubrication, good system cleanliness and specific bearing stressing are met. The article provides a guideline for bearing engineers on how designs and technologies can be applied to optimizing a bearing for a particular industry or aerospace application.

关键词： aerospace rolling contact fatigue endurance life materials heat treatment lubrication reliability

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An Overview of Performance Characteristics, Experiencesand Trends of Aerospace Engine Bearings Technologies

引用

Chinese Journal of Aeronautics 2007年第4期20卷 378-384页

作者： ebert franz-josef Sales and Product Development Aerospace FAG Aerospace GmbH & Co. KG Schweinfurt D-97421 Germany

In this paper, the operating conditions, technical requirements, performance characteristics, design ideas, application experiences and development trends of aerospace engine bearings, including material technology, integration design and reliability, are reviewed. The development history of aerospace engine bearing is recalled briefly at first. Then today＇s material technologies and the high bearing performances of the bearings obtained through the new materials are introduced, which play important roils in the aeroengine bearing developments. The integration design ideas and practices are explained to indicate its significant advantages and importance to the aerospace engine bearings. And the reliability of the shaft-bearing system is pointed out and treated as the key requirement with goals for both engine and bearing. Finally, as it is believed that the correct design comes from practice, the pre-qualification rig testing conducted by FAG Aerospace GmbH ＆ Co. KG is briefly illustrated as an example. All these lead to the development trends of aerospace engine bearings from different aspects.

关键词： aerospace engine bearing performance characteristic material technology integrated bearing design reliability system cost

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