Radial lip type exclusion devices of various elastomers and configurations have been available to designers for decades. In recent years the steel-encased polyurethane rod scraper has become popular in the most difficult service environments of hydraulic cylinders on mobile equipment.
An adaptation of this proven cylinder component is now extending lubrication intervals and life of critical linkage pins and bushings at oscillating pivot points on off-road construction and materials handling equipment. Its purpose is to exclude foreign material such as dirt, water, stones while retaining lubricants at the pin and bushing interface.
The polyurethane material with its high tear strength and abrasion resistance extends seal life. Yet, its configuration allows for lubrication at longer maintenance intervals. Current information is that maintenance intervals have been reduced by ninety per cent.
Future adaptations of this technology might provide a sealed, lifetime-lubricated pin and bushing assembly.
