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What are the advantages of rolling bearings and plain bearings

Author:admin   Date:2022-02-19
Rolling bearings and sliding bearings are provided with raceways on the outer circumference of the inner ring and the inner circumference of the outer ring. When the inner and outer rings rotate relative to each other, the rolling elements roll on the raceways of the inner and outer rings, and they are separated by the cage to avoid mutual friction. Thrust bearing is divided into two parts: tight ring and moving ring. The tight ring is tight with the shaft sleeve, and the moving ring is supported on the bearing seat. Rings and rolling elements are usually made of rolling bearing steel with high strength and good wear resistance, and the surface hardness after quenching should reach HRC60-65. The cage is mostly made of mild steel stamping, and can also be made of copper alloy cloth bakelite or plastic, etc.

Rolling bearings are easy to use and maintain, work reliably, have good starting performance, and have high bearing capacity at moderate speeds. Compared with sliding bearings, rolling bearings have larger radial dimensions, poorer vibration damping ability, lower lifespan at high speeds, and louder noises. The radial bearing in rolling bearing (mainly bearing radial force) usually consists of four parts: inner ring, outer ring, rolling body and rolling body cage. The inner ring is tightly sleeved on the journal and rotates with the shaft, and the outer ring is installed in the bearing seat hole.

The difference between rolling bearings and sliding bearings is first of all in the structure. Rolling bearings rely on the rotation of rolling elements to support the rotating shaft, so the contact part is a point. The more rolling elements, the more contact points. Sliding bearings rely on smooth surfaces. to support the rotating shaft, so the contact part is a face. Secondly, the movement mode is different. The movement mode of the rolling bearing is rolling; the movement mode of the sliding bearing is sliding, so the friction situation is completely different.

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