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Effect of silicon nitride balls and rollers on rolling bearing life
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Vlcek, Brian L. Hendricks, Robert C. Zaretsky, Erwin V. |
| Copyright Year | 2005 |
| Description | Three decades have passed since the introduction of silicon nitride rollers and balls into conventional rolling-element bearings. For a given applied load, the contact (Hertz) stress in a hybrid bearing will be higher than an all-steel rolling-element bearing. The silicon nitride rolling-element life as well as the lives of the steel races were used to determine the resultant bearing life of both hybrid and all-steel bearings. Life factors were determined and reported for hybrid bearings. Under nominal operating speeds, the resultant calculated lives of the deep-groove, angular-contact, and cylindrical roller hybrid bearings with races made of post-1960 bearing steel increased by factors of 3.7, 3.2, and 5.5, respectively, from those calculated using the Lundberg-Palmgren equations. An all-steel bearing under the same load will have a longer life than the equivalent hybrid bearing under the same conditions. Under these conditions, hybrid bearings are predicted to have a lower fatigue life than all-steel bearings by 58 percent for deep-groove bearings, 41 percent for angular-contact bearings, and 28 percent for cylindrical roller bearings. |
| File Size | 413166 |
| Page Count | 31 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20050175860 |
| Archival Resource Key | ark:/13960/t4sj6fj49 |
| Language | English |
| Publisher Date | 2005-04-01 |
| Access Restriction | Open |
| Subject Keyword | Structural Mechanics Stresses Service Life Fatigue Life Rollers Roller Bearings Predictions Silicon Nitrides Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
