DU bearings combine the advantages of many conventionally lubricated, metallic plain bearings-particularly high load capacity and dimensional rigidity-with the design freedoms of self-lubricating materials, including the ability to operate successfully well beyond the scope of conventional lubricants.
Applications
Agricultural equipment
Off-highway, truck, and automotive
Aviation
Business machines
Garden, lawn, and outdoor equipment
Hydraulics and values
Home applicances and consumer goods
Materials handling
Medical and dental
Marine and outdoor equipment
Packaging
Recreational vehicles
Railway equipment
Textile equipment
Tools
Features
Steel backing gives DU its exceptionally high load carrying capacity; thin, compact design; excellent heat dissipation; and dimensional and structural rigidity.
Porous bronze innerstructure: This comprises a nominal 0.010" (0.25 mm) thick layer of carefully sized bearing quality bronze powder which is sintered onto the steel backing. This porous structure is impregnated with a homogeneous mixture of PTFE (polytetrafluoroethylene) and lead. In addition to providing maximum thermal conductivity away from the bearing surface, this unique bronze innerstructure also serves as a reservoir for the PTFE-lead mixture.
PTFE-lead overlay: This low friction overlay, approximately 0.001" (0.025 mm) thick, provides an excellent initial transfer film which effectively coats the mating surface of the bearing assembly, forming an oxide type solid lubricant film. As this film is depleted, the relative motion of the mating surface continues to draw material from the porous bronze layer.
When conditions are severe, the feed of lubrication is increased. The peaks of porous bronze coming in contact with the mating surface generate localized heat and, due to the high thermal expansion rate of the PTFE, force additional lubricant to the bearing surface. The relative motion of the mating parts wipes the lubricant over the interface, continuously restoring the low friction surface film.
Loads - P: dynamic pressures up to 20,000 psi (140 N/mm2) ensuring high load carrying capacity and excellent resistance to shock loading
Speeds – V: Speeds up to 1,000 ft/min (5m/s) without lubrication; 2,000 ft/min (10 m/s) with lubrication
PVs to 50,000 psi-ft/min (1.75 N/mm2 x m/s) for continuous operation, 100,000 psi-ft/min (3.50 N/mm2 x m/s) for short-term use. In actual operation, DU bearings have been successfully used at levels which approach 3,000,000 psi-ft/min (105 N/mm2 x m/s) lubricated.
Temperatures from -328 °F to 536 °F (-200 °C to 280 °C) making it suitable for use in applications well beyond the scope of most liquid lubricants
Ideal for all types of rotating, oscillating, sliding motion, and both radial and thrust loading
Can be used totally dry, fully lubricated, or with intermittent lubrication and can be used in the presence of many industrial liquids
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