Do you know what is radial bearing?

There are many types of sliding bearings, which can be divided into radial bearing (supporting radial loads) and thrust bearings (supporting axial loads) according to the way they bear loads.

Structure and composition of radial bearing:
The part of the shaft supported by the bearing is called the journal, the part that matches the journal is called the bearing bush, and the part of the bearing bush made into a full cylinder is called the bearing bush of the bushing. The half is called the bearing housing. The cover and the seat are connected by studs, and the joint surfaces of the two are positioned by a stop or a pin, and spacers of different thicknesses can be placed to adjust the bearing clearance. The joint surface of most bearings is horizontal, and some are inclined to meet the requirements that the load direction is close to perpendicular to the joint surface. In order to facilitate the entry of lubricating oil between the friction surfaces, the radial bearing cover is provided with an oil injection hole, and the radial bearing bush has an axial oil groove for distributing lubricating oil. Bearing caps and seats are mostly made of cast iron, and those with large loads are welded by cast steel or steel plates.

Main structural form:

(1) Integral radial bearing

The structural form of the integral radial bearing consists of a bearing seat and an integral shaft sleeve made of anti-friction material. The bearing seat is provided with a threaded hole for installing the lubricating oil cup. An oil hole is opened on the shaft sleeve, and an oil groove is opened on the inner surface of the shaft sleeve. The advantages of this kind of bearing are simple structure and low cost. Its disadvantage is that after the shaft sleeve is worn, the bearing clearance cannot be adjusted when the bearing clearance is too large; in addition, it can only be assembled and disassembled from the end of the journal, and it is inconvenient or impossible to install and disassemble the shaft of the heavy machine or the shaft with the intermediate journal. . Therefore, this kind of bearing is mostly used in low-speed, light-loaded or intermittent machines, such as some agricultural machinery, manual machinery, etc. The bearing seat used for this kind of bearing is called the overall lined radial bearing seat.

(2) Split radial bearing
The split radial bearing is composed of a bearing seat, a bearing cover, a split bearing shell and a double-ended stud. The split surfaces of the bearing cap and bearing seat are often stepped to facilitate alignment and prevent lateral misalignment. There are threaded holes on the upper part of the bearing cover to install oil cups or oil pipes. The split bearing is composed of upper and lower halves, usually the lower bearing bears the load, and the upper bearing does not bear the load. In order to save precious metals or for other needs, a layer of bearing lining is often attached to the inner surface of the bearing bush. An oil groove is provided on the surface of the inner wall of the bearing bush that does not bear the load, and the lubricating oil flows into the bearing through the oil hole and the oil groove. The bearing split surface is preferably close to the direction of the load, and the split plane of most bearings is horizontal (some are also inclined For example, it is inclined by 450 to adapt to the situation where the inclination of the radial load action line exceeds the left and right sides of the vertical centerline of the bearing by 35 degrees). This kind of bearing is easy to assemble and disassemble, and after the bearing pad is worn, the bearing clearance can be adjusted by reducing the thickness of the shim at the split surface (the inner hole of the bearing pad should be repaired after adjustment). The bearing seat used for this radial bearing is called a split two-stud positive radial bearing seat, and the four-stud positive radial bearing seat is shown.

In addition, the back of the bearing bush can be made into a convex spherical surface, and its supporting surface can be made into a concave spherical surface, so as to form a self-aligning bearing, which is used to support a long shaft with large deflection or multiple fulcrums.

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