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- Title
Speed Distribution Ratio of Double-Decker Rolling-Element Bearings.
- Authors
Yu Chengtao; Xu Longxiang; Jiang Peng; Jin Chaozvu; Zhu Yili
- Abstract
The speed distribution ratio formulas of double-decker ball bearings (DDBB) are respectively derived based on pure rolling theory and friction torque theory. And then the speed distribution ratio for different structures and lubricating methods are experimentally studied. The results show that the ratio calculated using friction torque theory is closer to the experimental results. The speed distribution ratio is mainly determined by the pitch diameter ratio of the inner and outer bearings. Better speed distribution ratio performance can be obtained from bigger pitch diameter ratio. When the rotor rotates at the speed of 10 000 r/min, the speed distribution ratio equals 0.038 for relatively smaller pitch diameter ratio 0.59, while the distribution ratio becomes 0.17 for larger pitch diameter ratio 0.75. The speed distribution is also influenced by lubricating methods and lubricant viscosity. Adopting oil to lubricate both inner and outer bearings is more stably than grease lubrication.
- Subjects
BEARINGS (Machinery); TORQUE; LUBRICATION &; lubricants; ROTORS; FRICTION
- Publication
Journal of Nanjing University of Aeronautics & Astronautics / Nanjing Hangkong Hangtian Daxue Xuebao, 2012, Vol 44, Issue 3, p285
- ISSN
1005-2615
- Publication type
Article