Design and Calculation of High Speed Engine Bearings,
ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRANCE)
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New aspects in design and calculation of high speed ball and roller bearings are discussed in as much as they effect bearing performance in the speed range of DxN 3,000,000min and beyond. For roller bearings the guide flange to roller end configuration as well as roller excursion while the cage pocket are linked to the phenomena of skewing and skidding. The need for under-race-lubrication in small diameter engine bearings is derived from this and a special solution integral scoop is shown along with related performance data. The influence of incorporating state of the art rolling elements made of silicon nitride on the design and calculation of high speed ball and roller bearings is shown taking into account hardness, density, Youngs modulus and the Poisson ratio. Increased speeds coupled with additional design features being incorporated such as lubrication holes, grooves, slots require than inner rings of improved fracture toughness be developed with existing materials of known properties thus supplementing the material development activities already under way.