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KBC Bearings Available from Stock
KBC Bearings Available from Stock
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Rabe Golden Eagle Disk Harrow Bearing Units
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Metal-polymeric Plain Bearings. Materials

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Machine building and transport
Due to the use of the composite materials, the maintenance free bearings have good sliding performance and law friction coefficient, high life time and practically no wear of the sliding bearing surface, high chemical durability and appropriateness for the rotation as well as for the oscillation movement.

The maintenance free bearings are used in the hydraulic pumps and motors, hydraulic actuators and shock absorbers, electric motors and gears as well as in many other units of the different machines and mechanisms.


Metal-polytetrafluoroethylene composite (metal-fluoroplastic)

Microstructure

Structure Thickness, mm Material
0,010…0,030 Polytetrafluoroethylene (PTFE)
0,200…0,300 Sintered bronze
0,400…2,300 Low-Carbon steel padding
0,005…0,008 Protective coating (tin or copper)

Metal-polytetrafluoroethylene is the best material for the dry friction, though it can also be used with the additional lubrication.

Physical properties

Parameter Measurement unit Value
Sliding velocity V, max. m/s 2,50
Combined factor pV, max. N/mm²×m/s (MPa×m/s) 1,80
Friction coefficient f 0,02…0,25
Static load Ps, max N/mm² (MPа) 250
Dynamic load Pd, max. N/mm² (MPа) 140
Working temperature range T °C −200…+280
Shaft surface roughness Ra, max. mm 0,04
Shaft surface hardeness, min. HB 200


Metal-polyoxymethylene composite

Microstructure

Structure Thickness, mm Material
0,300…0,500 Polyoxymethylene (POM)
0,200…0,300 Sintered bronze
0,400…2,200 Low-Carbon steel padding
0,005…0,008 Protective coating (tin or copper)

In comparison with metal-polytetrafluoroethylene, metal-polyoxymethylene has lubrication pockets on the working surface, but it still shows good characteristics even with the minimum lubrication quantity. Due to the augmented polymer coat metal-polyoxymethylene is much less critical to the quality of the sliding bearing surface treatment.

Physical properties

Parameter Measurement unit Value
Sliding velocity V, max. m/s 2,50
Combined factor pV, max. N/mm²×m/s (MPa×m/s) 2,80
Friction coefficient f 0,06…0,12
Static load Ps, max N/mm² (MPа) 140
Dynamic load Pd, max. N/mm² (MPа) 70
Working temperature range T °C −40…+130
Shaft surface roughness Ra, max. mm 0,04
Shaft surface hardeness, min. HB 200


We offer a wide range of the maintenance free bearings from the mentioned above materials of the standard dimension types according to ГОСТ 28773-90 “Plain bearings. Wrapped bushes with anti-friction layer based on polytetrafluoroethylene-KU. Dimensions and tolerances” and ГОСТ 28774-90 “Plain bearings. Wrapped bushes with anti-friction layer based on polyacetal-KX. Types, dimensions and tolerances” as well as of the special dimension types produced according to the customer’s design.

 
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