Get Bearin Desig In Machinery PDF

By Avraham Harnoy

ISBN-10: 0824707036

ISBN-13: 9780824707033

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Example text

But the viscosity of synthetic oils also decreases with increasing temperature. During bearing operation, the temperature of the lubricant increases due to the friction, in turn, the oil viscosity decreases. For hydrodynamic bearings, the most important property of the lubricant is its viscosity at the operating bearing temperature. One of the problems in bearing design is the difficulty of precisely predicting the final temperature distribution and lubricant viscosity in the fluid film of the bearing.

The resistance to the flow from the opposing recesses decreases and increases, respectively (the resistance is inversely proportional to h3o ). This results in unequal flow rates in the opposing recesses. The flow increases and decreases, respectively. An important characteristic of a flow restrictor, such as a capillary tube, is that its pressure drop increases with flow rate. In turn, this causes the pressures in the opposing recesses to decrease and increase, respectively. The bearing load capacity resulting from these pressure differences acts in the opposite direction to the radial load on the journal.

But at very high speeds, the fatigue life of rolling element bearings can be too short, so other bearing types should be selected. Bearing speed is an important consideration in the selection of a proper type of bearing. High-quality rolling-element bearings, which involve much higher cost, are available for critical high-speed applications, such as in aircraft turbines. Over the last few decades, a continuous improvement in materials and the methods of manufacturing of rolling-element bearings have resulted in a Classi¢cation and Selection of Bearings 15 significant improvement in fatigue life, specifically for aircraft applications.

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Bearin Desig In Machinery by Avraham Harnoy


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