As a key partner of bearings, housings play a central role in various mechanical systems. It is usually installed at both ends of the shaft and is mainly used to support the bearing, fix the shaft system position, and ensure a stable connection between the bearing and the external structure. The bearing housing is often equipped with a sealing device, which can effectively reduce the intrusion of pollution and extend the bearing life.

From the structural point of view, the bearing housing can be divided into split type, integral type, flange type, spherical type and other types, among which the integral structure is commonly used in rolling mills and other fields. Common materials used to manufacture bearing housings include cast steel, gray cast iron, ductile iron and stainless steel, etc., and rolling mill housings are mostly made of high-strength cast steel.

The selection of bearing housing is closely related to the material, structure, size, etc.: cast steel or solid castings are generally selected for smaller apertures, sand casting can be used for larger apertures, and cast steel castings are mostly chosen for mass production to take into account efficiency and cost control. As a key part of the coordination with the outer ring of the bearing, the dimensional accuracy, cylindricity, coaxiality, etc. directly affect the assembly and operation accuracy, and the surface roughness is generally controlled at Ra3.2~Ra1.6 to meet the requirements of support positioning function and wear resistance.

The demand for bearing housings in the industrial field is extensive, from heavy machinery to precision equipment, and it is inseparable from its reliable support. With the development of Industry 4.0 and intelligent manufacturing, bearing housings are gradually developing in the direction of lightweight structure, process precision, and appearance integration on the basis of meeting function and strength, and better adapt to high-end application scenarios such as high-precision direct drive systems.