Despite the wide variety of bearing types, but you may […]
Despite the wide variety of bearing types, but you may still not be familiar with certain types, such as fluid bearings. It is not as good as many other common types. People rarely see it. But it is also an important type can be applied in many specific cases. For example, it can be used ordinary ball bearing high load or high noise and short life of high vibration, high speed or high accuracy applications frequently. It can support a load of the bearings in only a thin layer of liquid or gas.
It has many features. First, it requires little maintenance. At the same time, it has a long service life, while conventional bearings are usually short-lived, require regular maintenance. Second, unlike many other common types, it is cheaper, because it can be as simple as two smooth surface with a seal to maintain the working fluid. However, the conventional rolling bearing may require many complex shapes with high precision rollers.
Third, it generally has a lower friction. Hydrostatic gas bearing is one of the lowest coefficient of friction of the bearing. Fourth, it is harder than mechanical bearings. Like the maximum design load, stiffness seems to be a simple function of the average fluid pressure and the bearing surface area.
In addition to its advantage, the fluid bearing has many drawbacks. For example, the fluid remains more difficult in the bearing. In the case of impact, ball bearings may be destroyed, and the ball will gradually deteriorate and produce sound symptoms. In addition, it has a higher overall power consumption.
The fluid bearing can be divided into a hydrodynamic bearing or the hydrostatic bearing. The latter depends on the type of high-speed spindle, it can wedge between the end faces of the self-pressurizing fluid. Moreover, this type of bearing is also pressure from the outside, this should be done by using an external pump. Or external pump and the auxiliary bearing can be used to start off, to prevent damage to the fluid dynamic bearing.
How does it make fluid into the bearing? There are two main methods different from each other. A fluid through an orifice or porous material (if in hydrostatic pressure, and a plurality of gas hydrostatic bearing or air) is pumped. However, hydrodynamic bearing, the bearing fluid will be drawn into the rotating surface of the bearing.