Introduction of single and double ball bearings

wallpapers Industry 2020-07-20

Single ball bearing

Single ball bearings are an improvement over traditional oil-sealed bearings. In the form of a mixture of sliding friction and rolling friction, the cost of a double ball bearing is actually reduced by using a ball bearing and an oil-bearing.

The single ball bearing has low noise and long life. It overcomes the shortcomings of high noise, high cost, and great difficulty of the double ball. It inherits the advantages of a long life of double ball ~ It absorbs the advantages of low noise of oil seal bearing ~ It can be said to be a low price. The preferred bearing here is comparable to the hydraulic bearing. Its life is 40.000 to 50.000 hours. The advantage is that long-term use of noise will not increase, no need to add lubricants, single-ball bearings after long-term use of a slight increase in noise can be added to solve Problem ~ But hydraulic bearings are not used, so hydraulic bearings are difficult and expensive.

Double ball bearing

Double ball bearings are relatively high-grade bearings. There are several tiny steel balls around the shaft in the bearing. When the fan leaf or the shaft rotates, the steel balls will rotate accordingly. Because they are all spheres, the friction is small, and there is no problem of oil leakage.

The advantages of the double-ball fan are long life, about 50.000 ~ 100.000 hours; good anti-aging performance, suitable for fans with higher speed. Disadvantages of double ball bearings are high manufacturing costs and maximum noise at the same speed level (because the ball bearing friction point is increased by a factor of two).

The double ball bearing is completely embedded in the fan, and the rotating part has no direct contact with the outside world. In a sealed environment, the working environment of the bearing is relatively stable. As a result, almost all large-diameter fans at the 5.000-rpm level use double ball bearings. The hydraulic bearing has a unique return type oil circuit, so the possibility of lubricant leakage is slight.