Read e-book online Bearin Desig In Machinery PDF

By Avraham Harnoy

ISBN-10: 0824707036

ISBN-13: 9780824707033

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The centrifugal force is proportional to the second power of the angular speed. Similarly, the bearing size increases the centrifugal force because of its larger rolling-element mass as well as its larger orbit radius. The DN value (rolling bearing bore, in millimeters, times shaft speed, in revolutions per minute, RPM) is used as a measure for limiting the undesired effect of the centrifugal forces in rolling bearings. Currently, the centrifugal force of the rolling elements is one important consideration for limiting aircraft turbine engines to 2 million DN.

For this reason, lubricants with less sensitive viscosity to temperature variations would have a distinct advantage. This has been the motivation for developing the multigrade oils, which are commonly used in engines today. An example of a multigrade oil that is widely used in motor vehicle engines is SAE 5W-30. The viscosity of SAE 5W-30 in a cold engine is about that of the low-viscosity oil SAE 5W, while its viscosity in the hot engine during operation is about that of the higher-viscosity oil SAE 30.

Rolling friction is lower than sliding friction; therefore, rolling bearings have lower friction energy losses as well as reduced wear in comparison to sliding bearings. Nevertheless, the designer must keep in mind that the life of a rollingelement bearing can be limited due to fatigue. Ball bearings involve a point contact between the balls and the races, resulting in high stresses at the contact, often named hertz stresses, after Hertz (1881), who analyzed for the first time the stress distribution in a point contact.

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Bearin Desig In Machinery by Avraham Harnoy

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