What aspects should be considered when choosing a bearing clearance?

When choosing a bearing clearance, the following aspects should be considered:

      1, the working conditions of the bearing, such as load, temperature, speed, etc.;

      2. Requirements for bearing performance (rotational accuracy, friction torque, vibration, noise);

      3. When the bearing and the shaft and the housing hole are in an interference fit, the bearing clearance is reduced;

      4. When the bearing is working, the temperature difference of the inner jacket ring causes the bearing clearance to decrease;
     
      5. The bearing clearance is reduced or increased due to the different expansion coefficients of the shaft and the outer casing material.

      6, according to the experience of use, the most suitable working clearance of the ball bearing is close to zero; roller bearings should maintain a small amount of working clearance. In components requiring good bearing rigidity, the bearings allow a certain amount of preload. It is specifically pointed out here that the so-called working clearance refers to the clearance of the bearing under actual operating conditions. There is also a kind of play called the original play, which refers to the play before the bearing is not installed. The original clearance is larger than the installation clearance. Our choice of clearance is mainly to choose the right working clearance. Valve inlet pump

For more information and purchase please visit: https://www.supplyforever.com

Bearing raceway noise problem

The bearing noise of the bearing, the rolling sound is caused by the rolling of the rolling elements in the raceway when the bearing rotates to excite a smooth and continuous noise, which only attracts people's attention when its sound pressure level or tone is extremely large.

In fact, the sound energy stimulated by the rolling track is limited. For example, under normal conditions, the quality of the 6203 bearing raceway is 25 to 27 dB. This type of noise is the most typical of single row deep groove ball bearings that can withstand radial loads. It has the following characteristics:

a, noise, vibration is random;

b, the vibration frequency is above 1kHz;

c. Regardless of the change in the rotational speed, the main frequency of the noise is almost constant and the sound pressure level increases as the rotational speed increases;

d. When the radial clearance increases, the sound pressure level increases sharply;

e, the rigidity of the bearing seat increases, the lower the total sound pressure level, even if the rotation speed increases, the total sound pressure level does not increase much;

f. The higher the viscosity of the lubricant, the lower the sound pressure level, but for grease lubrication, the viscosity and the shape and size of the soap fiber can affect the noise value.

The source of the rolling sound is caused by the natural vibration of the ferrule after the load. Due to the elastic contact of the ferrule and the rolling body, a nonlinear vibration system is formed. When the lubrication or machining accuracy is not high, the natural vibration associated with this elastic characteristic is excited, and when it is transmitted to the air, it becomes noise.

Although the bearing raceway noise is unavoidable, it is possible to use high-precision machining of the working surface of the part, the correct selection of the bearing and the precise use of the bearing to reduce noise and vibration.

For more information and purchase please visit: https://www.supplyforever.com