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Composite Dry Sliding Bearings

      The composite dry sliding sleeve is a dry sliding (journal) plain bearing for bearing with 

radial load, requiring only a small radial space. Such bushings allow reciporating or ratational 

movement. Suitable for maintenance-free applications or where lubricant deficiencies may occur.

      Introduction:

      There are two standard designs for composite bushings, except for the components of the sliding layer: composite B/E bushings and composite M-bushings.

       B material has a layer of copper-plated steel backing (bearing wall thickness of 2 mm 

(inclusive)), above the sintered 0.2 to 0.4 mm thick tin bronze porous layer. Bearing wall thicker

 bearings, the backing is not copper. The mixture of PTFE (polytetrafluoroethylene) and other 

additives capable of reducing the friction is filled into the pores on the sintered layer by a 

pressing process. This layer of sintered copper is covered with a 5 to 30 mm thick, abrasive layer

 made of the same mixture. The bearings made with B/E  material provide the best combination of 

the mechanical properties of sintered copper with the excellent sliding and lubricating 

properties of the PTFE mixture. This combination ensures good dimensional stabllity and thermal 

conductivity.

      M material also has steel backing (wall thickness of 2 mm (inclusive) bearing copper 

plating) and 0.2 to 0.4 mm thick sintered tin bronze layer. Tha main feature of this tyoe of 

bearing is that its acetal resin (POM) coating is relatively thick (0.3 mm), tightly fixed on the 

sintered copper layer. The cover layer has a roller groove for lubricating grease. As the cover

 is thick, even if there is a certain degree of misalignment and not related to the edge of the 

load, the bearing is not vulnerable.

     Design:

     The composite dry slide sleeve is rolled so that the butt joint extends beyond the width of 

the entire sleeve. The roller sleeve made of M material is designed with a roller groove for 

grease. All free surfaces of the backing plate are electrolytic tinned. 

     Made of M material composite dry sliding sleeve, where the diameter of 10 mm (inclusive), the

 width of not less than 12 mm standard products, are equipped with a lubrication hole. The hole

 is centrally located at 45.5 degrees from the butt joint.  

     Size:

    The dimensions of metric composite dry sliding sleeves with diameters ranging from 4 to 160 

mm are included in ISO 3547-1976 and 1983 DIN 1494 part 1, with a dew exceptions. The size of the 

imperial hsaft has not yet been standardized.

     Tolerance:

     The outer diameter tolerance of the metric composite dry sliding sleeveis in accordance with 

the provisions of DIN 1494 Part of 1983. When checking the values, the steps specified in the DIN 

version of DIN 1494, Part 2 should be used.

     Allowable operating temperature range:

     B/E composite bushings can be used at temperatures between -200 ℃ and +250 ℃. M composite 

bushings range from -40 degree centigrade to +110 degrees Celsius, although they can work briefly 

at +130 degrees Celsius.

     Running Characteristics:

    During the brief run-in period, some of the material on the cover (PTFE) of the B/E composite 

bushing will be transferred to the opposite sliding surface. After the transfer occurs, you can 

get low friction and wear characteristics.

    Electrical Characteristic:

    The sleeve made of M material has an insulating effect because it is an acetal resin. In

order to avoid static accumulation, there are dangerous parts of electrostatic accumulation 

should be grounded.