high speed! high precision! ball bearing and ball bearing sizes

high speed! high precision! ball bearing and ball bearing sizes

Ball bearings

Ball bearings are a kind of rolling bearings. The ball bearings are installed in the middle of the inner ring and the outer ring and can withstand large loads. Also called ball bearings.
Structure and composition(ball bearing sizes)
The ball bearing is mainly composed of four basic elements: ball, inner ring, outer ring and retainer also called cage (cage or retainer). General industry ball bearings meet AISI 52100 standards, balls and rings are usually made of high chrome steel. Rockwell hardness (Rockwell C-scale hardness) is approximately between 61-65. The hardness of the retainer is lower than that of the ball and the ring, and its material is metal (such as medium carbon steel, Aluminum alloy) or non-metal (eg Teflon, PTEF, polymer materials). Ball bearings are more than journal bearings
The dynamic frictional resistance is small, so at the same speed, the frictional temperature will be lower. ball bearing sizes

Applications(ball bearing sizes):
The purpose of a ball bearing is to determine the relative position of two parts (usually a shaft and a bearing housing) and to ensure that they rotate freely while transmitting the load between them. 
At speeds (for example, in gyro ball bearings), this use can be expanded to include free rotation with virtually no wear in the bearing. In order to achieve this state, a layer can be used
The adhesive fluid film, which is an elastic hydrodynamic lubricating film, separates the two parts of the bearing. Denhardt (1966) pointed out that not only when the bearing bears the load on the shaft,
In addition, the elastic hydrodynamic lubricating film can be maintained when the bearing is subjected to preload so that the positioning accuracy and stability of the shaft do not exceed 1 micro-inch or 1 nano-inch.
Ball bearings are used in various machines and equipment with rotating parts. Designers often decide whether ball bearings or fluid film shafts should be used in specific applications. The following features make ball bearings more desirable than fluid film bearings in many situations.
1. The starting friction is small and the working friction is suitable.
2. Can withstand radial and axial joint loads.
8. Not sensitive to interruption of lubrication.
4. No self-induced instability.
5. Cold start is easy.
Within a reasonable range, changing the load, speed, and operating temperature have only a small effect on the good performance of the ball bearings.
The following features make ball bearings less desirable than fluid film bearings.
1. Limited changes in fatigue life.
2. The required radial space is large.
3. Low damping capability.
I. The noise level is high.
6. The stricter requirement for the middle.
6. higher cost.ball bearing sizes
According to the above characteristics, a piston film engine generally employs a fluid film bearing, and a jet engine almost exclusively uses a ball bearing. Various types of bearings have their own unique advantages.
At a given point, the most suitable bearing type should be carefully selected for a given application. The British Engineering Scientific Data Organization (ESDU 1965, 1967) has been the selection axis
Adhering to this important issue provides useful guidelines.

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