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The difference between rolling bearings and plain bearings
Author:admin Date:2022-02-22
Everyone is no stranger to bearings, so do you know the difference between rolling bearings and sliding bearings? Today, I will tell you the difference between the two types of bearings.
rolling bearing
A precision mechanical element that changes the sliding friction between the running shaft and the shaft seat into rolling friction, thereby reducing friction loss, is called rolling bearing. Rolling bearings generally consist of an outer ring, an inner ring, rolling elements and a cage. The function of the inner ring is to cooperate with the shaft and rotate with the shaft, the function of the outer ring is to cooperate with the bearing seat and play a supporting role, and the rolling elements are evenly distributed between the inner ring and the outer ring by means of the cage. , Its shape, size and quantity directly affect the performance and life of the rolling bearing. The cage can make the rolling elements evenly distributed, prevent the rolling elements from falling off, and guide the rolling elements to rotate for lubrication.
Plain bearing
Bearings that work under sliding friction. Sliding bearings work smoothly, reliably and without noise. In order to improve the friction properties of the bearing surface, the layer of anti-friction material cast on its inner surface is called a bearing lining. The materials of the bearing shell and bearing bush are collectively referred to as sliding bearing materials. Commonly used sliding bearing materials are bearing alloys (also known as babbitt or white alloys), wear-resistant cast iron, copper-based and aluminum-based alloys, powder metallurgy materials, plastics, rubber, hardwood and carbon-graphite, polytetrafluoroethylene (PTFE). ), modified polyoxymethylene (POM), etc. Sliding bearing applications are generally under low speed and heavy load conditions, or operating parts where maintenance and lubricating oil are difficult. Under liquid lubrication conditions, the sliding surfaces are separated by lubricating oil without direct contact, which can greatly reduce friction loss and surface wear, and the oil film also has a certain vibration-absorbing ability. But the starting friction resistance is large. The part of the shaft supported by the bearing is called the journal, and the part that matches the journal is called the bearing bush.
Well, the above is the introduction of the difference between rolling bearings and sliding bearings. I hope you can distinguish the two types of bearings.
