Plain bearings

During motion, shear friction is formed on the contact surface.

Advantages:
Simple structure
Small diameter (but large length!)
Simple assembly
Quiet operation (for high revolutions)
Withstanding impact loading

Disadvantages:
Precise manufacturing
Expensive (deficient) materials
Higher-quality lubrication (= higher maintenance requirements, more complicated operation)
High lubricant consumption

Calculation:
Same as for shaft pivots

Structural design

Basic components are a bearing housing and a casing.

A number of contradictory requirements are placed on the casing material:
Jamming aspect
Price
Friction intensity
Lubricant wettability
Good thermal conductivity

There are 2 standardised types of bearing casings: 

• Casing made completely of the bearing material
• Casing made of two materials – basic material and lining

Materials:

• Metallic materials 

Lead and tin composition
Tin, lead, and tin-lead bronze
Brass
Aluminium bronze
Aluminium compounds
sintered materials (18 280, 18 344), grey iron (42 24 15, 42 24 56).

• Non-metallic materials

PTFE materials
Polyvinyl acetate materials
Polycaprolactam materials
Harden-fabric materials (fabric + resin)
Hygroscopic-resistant rubber

There are numerous renowned manufacturers of plain bearings (casings) on the market. Each of them uses own marking of types and materials, while maintaining some established marking practices such as inner diameter, length or outer diameter.

We will be pleased to help you identify plain bearings used by you, or replace them with types supplied by our company.