What is it about?
Experimental investigation results for a new high speed ball bearing dedicated to aircraft engines are presented. The ball bearing combines technologies such as ceramic balls, direct outer ring cooling, squeeze film damping, as well as surface-nitrided raceways. The fundamental experimental results including oil and bearing temperature distribution, power dissipation, and bearing efficiency are presented. In addition, experimental power loss and temperature results are compared with data for a conventional all-steel bearing.
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Why is it important?
For the first time, speed indices (DN values) above 4 Mio mm/min were demonstrated for an aircraft engine ball bearing. Furthermore, savings for oil flow quantity of more than 45% and for power loss of more than 15% were identified. Outer ring temperature reductions of more than 20 K were achieved due to the use of ceramic ball material and the direct outer ring cooling concept.
Perspectives
The all-new ball bearing combines technologies enabling very high rotational speeds as required by future gas turbine applications. Moreover, the new ball bearing enables lower oil system weight, reduced fuel consumption and emissions, higher bearing reliability and a reduction of total cost.
Dr. Peter Gloeckner
Schaeffler Aerospace Germany GmbH & Co.KG
Read the Original
This page is a summary of: Comparison of Power Losses and Temperatures between an All-Steel and a Direct Outer Ring–Cooled, Hybrid 133-mm-Bore Ball Bearing at Very High Speeds, Tribology Transactions, December 2016, Taylor & Francis,
DOI: 10.1080/10402004.2016.1262930.
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