What are the commonly used sliding bearing materials?

- Mar 16, 2019-

What are the commonly used sliding bearing materials?

Commonly used sliding bearing materials are bearing alloy, wear-resistant cast iron, copper-based and aluminum-based alloys, powder metallurgy materials, plastics, rubber, hardwood and carbon-graphite, polytetrafluoroethylene (Teflon, PTFE), modified polyoxymethylene. (POM), etc.


What is a sliding bearing?

    Sliding bearing, bearing that works under sliding friction. The sliding bearing works smoothly, reliably and without noise. Under liquid lubrication conditions, the sliding surface is separated by the lubricating oil without direct contact, and the friction loss and surface wear can be greatly reduced, and the oil film also has a certain vibration absorbing capability. However, the starting friction resistance is large. The part of the shaft that is supported by the bearing is called the journal, and the part that matches the journal is called the bearing. The layer of friction reducing material cast on its inner surface in order to improve the frictional properties of the surface of the bearing pad is referred to as a bearing lining. The material of the bearing bush and bearing bushing is collectively referred to as a plain bearing material. Sliding bearing applications are generally used under low-speed and heavy-duty conditions, or where it is difficult to maintain and fill lubricants.

    The oil-free composite bearing is a three-layer composite bearing made of a steel plate with a steel plate as a base, a sintered spherical bronze powder in the middle, and a mixture of polytetrafluoroethylene (PTFE) and lead on the surface. It has the characteristics of small friction coefficient, good wear resistance and no oil lubrication. The use of this product can reduce costs, reduce mechanical volume, avoid the phenomenon of biting the shaft and reducing mechanical noise. It has been widely used in various mechanical sliding parts, such as printing machines, textile machines, fitness equipment, hydraulic pallet trucks, micro-motors, automobiles, motorcycles, and agricultural and forestry machinery.


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