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Bearing Knowledge Encyclopedia (6)
Source: Bearing network time: 2017-12-05
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The other extreme condition is exactly the opposite; that is, the high speed but the load is very small. If no preload is applied at this moment; the rolling body slides very much on the raceway; this will cause rapid overheating, damage to the lubricant, and permanent damage.
An important load that is often neglected in bearing selection is the radial and axial forces that occur in the device itself. The components of the gear and the tension of other components, and even the component of the shaft, are important forces that should participate in the total load. .
Determine the additional load capacity of the demand; the required service life, equivalent load, shaft speed and any improvement factor can be used together to calculate the required bearing load capacity.
In the meantime: C = additional dynamic load capacity required; N
L = L life expectancy of demand; h
N = shaft speed; r / min
P = equivalent load of the bearing; N
θ = dimensionless index of rollover touch type:
Point touch (ball bearing) or line touch (roller bearing). Pair ball bearing: θ = 3.00;
For roller bearings: θ = 3.33.
It is assumed that the force acting on the surface of the tumbler is uniform; then the C value can be calculated. However, in the power transmission equipment; different axial degrees are a common problem. In the selection of bearings; you need to compensate.
Although each type of bearing has a fundamental set of correction factors for different shaft degrees; however, the manufacturer's respective depiction characteristics also play an important role; you need to think about these characteristics. Generally; the manufacturer's sample lists their products. These coefficients.
Shape Constraint The additional load on the demand once the final value is determined; it is necessary to consider the dimensions of the bearing required for the bearing assembly; the device and the fixture that contains the bearing considered here, and the dimensions of the shaft that match the bearing with the required additional load. Size. These elements help to determine the bearing layout and dimensions; it is also possible to remove certain bearing types. In some cases; because of space constraints or even before the additional load is determined, the selected points are removed.
For example; if the bearing is very narrow; the ball bearing is the only type that can be used in this operation. Perhaps; if it is necessary to use a bearing housing with a very small diameter; you need to install two or more roller bearings on the same shaft. Talent arrives at the additional load that is satisfied.
When the dimensions of the shaft are very different from the measured additional load of the bearing; another common opposite is presented. If the shaft is large but the load is light; even if the additional load is required, the manganese å²¢é²†æ¡“éœ èŸ® modelæ¡“å¨ç–ƒã„” testicular silly thumb 笮 å²¢ å²¢ å²¢ å²¢ å²¢ å²¢ å²¢ å²¢ å²¢ å²¢ å²¢ å²¢ å²¢ å²¢ å²¢ å²¢ å²¢ å²¢ å²¢ å²¢ å²¢ å²¢
Example of the basic operating conditions. It is assumed that the bearing is applied to the reducer; the bearing is necessary to support one end of the shaft with a diameter of about 25 mm; and the shaft is equipped with a spur gear.
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