Ball bearing is a kind of rolling bearing. The ball is installed between the inner ring and the outer ring and can withstand larger loads. Also called ball bearings, such as Miniature Ball Bearings.
The purpose of the ball bearing is to determine the relative position of the two parts (usually the shaft and the bearing seat) and to ensure their free rotation, while transmitting the load between them. At high speeds (such as in gyro ball bearings), this use can be extended to include free rotation with almost no wear in the bearing. In order to achieve this state, an adhesive fluid film called an elastohydrodynamic lubricating film can be used to separate the two parts of the bearing. Denhard (1966) pointed out that the elasticity can be maintained not only when the bearing bears the load on the shaft, but also when the bearing is preloaded so that the positioning accuracy and stability of the shaft does not exceed 1 microinch or 1 nanoinch. Hydrodynamic lubrication film .
Ball bearings are used in various machines and equipment with rotating parts. Designers often have to decide whether to use a ball bearing or a fluid film bearing in a particular application. The following characteristics make ball bearings more desirable than fluid film bearings in many occasions,
1. The starting friction is small and the working friction is appropriate.
2. Can withstand combined radial and axial loads.
8. Not sensitive to interruption of lubrication.
4. There is no self-excited instability.
5. Easy to start at low temperature.
Within a reasonable range, changing the load, speed and working temperature has only a small effect on the good performance of the ball bearing.
The following characteristics make ball bearings less desirable than fluid film bearings.
1. The limited fatigue life varies greatly.
2. The required radial space is relatively large.
3. The damping capacity is low.
I. The noise level is high. ·
6. The alignment requirements are stricter.
6. higher cost.
According to the above characteristics, piston engines usually use fluid film bearings, while jet engines almost exclusively use ball bearings. Various types of bearings have their own unique advantages. In a given application, the most suitable type of bearing should be carefully selected. The British Engineering Scientific Data Organization (ESDU 1965, 1967) has provided useful guidelines for the important issue of bearing selection.
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