Self-lubricating Bushings (Graphite Filled)

Self-lubricating bushings/sliding pads are provided with solid lubricant (graphite base) inserted in holes/grooves. The solid lubricant forms a continuous lubricating film between the contact sliding surfaces and prevents metallic contact between the moving parts.


Applications:

  • Mechanical and structural engineering
  • Automotive industry
  • Rolling mill and steel mill equipment
  • Bearings for industrial furnaces
  • Shipbuilding and offshore engineering
  • Cranes, elevators, and other conveyor equipment
  • Mining and quarrying industry
  • Chemical industry
  • Cargo handling equipment
  • Molding machines
  • Special machines construction

 

Advantages:

  • Free/low-maintenance operation with long maintenance intervals
  • No/limited lubrication requirements and no lubrication equipment requirement, and particularly suited for inaccessible places
  • Environment friendly as there is no contamination by oil or grease and no disposal costs
  • High load capacity
  • Less sensitive to impact, shock, dynamic and alternating load
  • Low coefficients of friction
  • High wear resistance
  • No stick-slip
  • Good heat conductivity
  • Elevated temperature resistance
  • High corrosion resistance
  • Flame resistance

 

Technology

The solid lubricant, accommodated in the holes/grooves, starts to build up a uniform, adherent lubricating film during the initial sliding movements of the running-in operation. It also fills the roughness valleys of the two surfaces sliding one on top of the other. By these means, the bearing surfaces are separated from each other and metallic contact is prevented. During operation, the lubricating film is constantly replenished by lubricant particles emerging from the source.

 

Also, in addition to its high load-carrying capacity, the solid lubricant acts as a reservoir by absorbing any embedded metallic rubbings, foreign particles and dirt into the lubricant holes/grooves. These embedded particles displace a similar amount of lubricant, which is then is available for the lubrication of the bearing surfaces. This absorption of unwanted particles and release of solid lubricant makes the operation reliable and maintenance-free.

 

Uniformly distributed holes are drilled into the bearing surfaces of the base material and are filled with graphite base solid lubricant compound. The surface area of the solid lubricant is maintained at about 25 to 30% to the total bearing surface and the holes are arranged in such a way that as to ensure that there is an overlap of the slide surface in the direction of movement.

 

Solid lubricated bushings in general require bigger clearances than oil/grease lubricated ones, for building-up the lubricating film.