Rolling and sliding bearing omnidirectional performance comparison

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Let us first look at the structure of rolling bearings. Rolling bearings are rolling bearings developed on the basis of sliding bearings. Their working principle is to use rolling friction instead of sliding friction, which is generally composed of two rings, a set of rolling elements and a cage. Very strong, standardized, highly serialized mechanical basic parts. Due to the different working conditions of various machines, various requirements have been put forward for the rolling bearing in terms of load capacity, structure and serviceability. For this reason, rolling bearings need to have a variety of structures. However, the most basic structure consists of an inner ring, an outer ring, rolling elements, and a cage—commonly referred to as four major pieces. For sealed bearings, coupled with lubricants and seals (or dust cover) - also known as the six major pieces. The names of various bearing types are often named according to the names of the rolling elements. The role of various parts in the bearing is: For radial bearings, the inner ring is usually tightly fitted with the shaft and runs with the shaft. The outer ring is usually in transition with the bearing housing or the mechanical housing hole to provide support. However, in some cases, there is also the outer ring operation, the inner ring is fixed to support or the inner ring and the outer ring operate at the same time. For a thrust bearing, a sizing ring that fits tightly with the shaft and moves together, and a seating ring that is in a transitional fit with the bearing housing or the mechanical housing bore and acts as a support. Rolling elements (balls, rollers, or needles) are usually rolled in a bearing by means of a cage that is evenly arranged between the two rings. Its shape, size and number directly influence the bearing's load capacity and performance. In addition to the cage can evenly separate the rolling elements, but also can play a role in guiding the rolling element rotation and improve the bearing internal lubrication properties.

Then we look at the structure of the sliding bearing. Sliding bearings generally consist of a bearing shell and a bearing seat. Sliding bearing can be divided into radial sliding bearing (mainly bearing radial load) and thrust sliding bearing (mainly bearing axial load) according to the direction of the load it is subjected to. The commonly used radial bearings are constructed in integral and split type.

1. Integral sliding bearings are bolted to the frame. The bearing seat hole is pressed into a bearing bush made of a friction reducing material (or a bushing), and an oil cup is arranged on the top of the bearing seat. The bushing has an oil inlet hole, and the inner surface opens an axial oil groove to distribute the lubrication oil. . The biggest advantage of the integral type sliding bearing is that the structure is simple, but the bearing clearance cannot be adjusted when the bearing working surface wears too much; the journal can only be loaded from the end, which is inconvenient to install on the heavy shaft or the shaft with the intermediate journal, even Unable to install. To overcome these two disadvantages, split sliding bearings can be used.

2. Split sliding bearings are composed of bearing seats, bearing covers, split bearings (divided into upper and lower tiles) and connecting bolts.
The split surface of the bearing should be nearly perpendicular to the load direction. Most bearing split surfaces are horizontal and inclined. The split surface of the bearing cap and the bearing seat is often formed into a stepped shape in order to locate and prevent the misalignment during operation. The bearing clearance after the wear of the bearing bush can be adjusted by reducing the metal gasket at the cutting surface or scraping the metal of the bearing bush. Split spherical bearings are easily assembled and disassembled, and the gap between the bearing bush and the shaft can be adjusted and widely used.