THE ART OF COMPRESSION

Thick walled bimetallic sliding bearings


Bimetallic thick-walled bearing brass with sliding layer on basis of copper alloys.

Sliding bearings for the working conditions with the hydrodynamic lubrication, suitable for static and dynamic load.

The sliding material is deposited by the casting on the base steel. It has got a universal structure, it is characterised by good sliding characteristics also under the conditions of boundary friction. Normally it is being used with galvanically spread superficial layer of PbSn. The bearings with the lining BS 3332 are not being galvanised. A journal in sliding bedding does not require superficial friction. For the high loaded sliding  bedding, the sliding material CuPb22Sn with higher dynamic load is used. Because of its good sliding characteristics, they are applied as the main crank  bearings in combustion engines, as the bearings of tool machines etc.

The dimensions of bearings, which are produced by this method:

  • minimum diameter: 20 mm
  • maximum diameter: 500 mm
  • maximal width: 400 mm
Specifications MU B22 B30 Bs3332
Chemical composition of sliding layer   CuPb22Sn CuPb30 SnSb10Cu3Ni
Elasticity strength Mpa 200-250 100-150 80-100
Tensile strength Mpa 90000 73000 70000
Elongation % 2,2-3 2-3 2,2-3
Hardness HV50   45-80 30-45 28-30
Max. load at dynamic tension Mpa 42 32 30
Max. operating temperature oC 220 160 110
Tensile strength of steel Mpa 400-550 400-540 400-550
Yield limit of the base steel Mpa min. 280
Hardness of the base steel HB 150

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