Sliding self-lubricating bearing structure:

The bearing shell is divided into a split type and a monolithic structure. In order to improve the friction properties of the bearing surface, one or two layers of antifriction material are often cast on the inner diameter surface, commonly referred to as a bearing lining, so that the bearing has a bimetallic bearing and a three metal bearing.

Bearing bush or bearing lining is an important part of sliding bearing, and the material of bearing bush and bearing lining is collectively referred to as bearing material. Since the bearing bush or bearing bushing is in direct contact with the journal, the journal portion is generally wear resistant, so the main failure mode of the bearing bush is wear.

The wear of the bearing bush is directly related to the material of the journal, the material of the bearing bush, the lubricant and the lubrication state. The selection of the bearing material should take these factors into consideration to improve the service life and working performance of the sliding bearing.

The materials of the bearing are:

1) Metal materials: bearing alloys such as bearing alloys, bronzes, aluminum-based alloys, and zinc-based alloys: bearing alloys, also known as white alloys, are mainly alloys of tin, lead, antimony or other metals, due to their good wear resistance and plasticity. High performance, good running performance, good thermal conductivity, good resistance to glue and good adhesion to oil, so it is suitable for heavy load and high speed. The strength of bearing alloy is small and the price is expensive. It must be cast when used. A thinner coating is formed on the bush of bronze, steel or cast iron.

2) Porous metal material (powder metallurgy material): Porous metal material: Porous metal is a powder material which has a porous structure. If it is immersed in a lubricating oil, the pores are filled with lubricating oil and become Oil-impregnated bearings with self-lubricating properties. The porous metal material has low toughness and is only suitable for smooth non-impact loads and medium and small speeds.

3) Non-metallic materials: bearing plastics: commonly used bearing plastics are phenolic plastic, nylon, PTFE, etc. Plastic bearings have large compressive strength and wear resistance, can be lubricated with oil and water, and also have self-lubricating properties. However, the thermal conductivity is poor.