EWS (Extended Wear Surface) bearings are built for the toughest jobs, lasting significantly longer in harsher conditions than our popular MRP standard bearing. The inspiration for the EWS bearing was a high frequency, low oscillation angle agricultural application that built total sliding distances quickly and resulted in wear failures. To solve this, Polygon utilized tribology research to create a new composite bearing liner system, custom engineered to improve the performance of wear surfaces. The EWS bearing has the same specifications as our flagship MRP bearing line but with increased wear resistance and reliability in contaminated joint locations with small design envelopes. Seals and their machining cost can sometimes be eliminated thanks to the increased contaminated environment performance.
CONSTRUCTION AND MINING
When large construction machinery is taken off-line, entire projects can be paused leading to costly delays. The PolyLube® EWS™ bearing allows for equipment to operate maintenance-free for longer periods of time. Beyond the normal demands for reliability and predictability, this can also reduce the number of scheduled maintenance visits and their attendant downtime. Extended wear can allow scheduled bearing replacement to be combined with other major component overhaul maintenance schedules on a single call.
Planting and harvesting seasons occur in narrow windows of time, requiring the equipment to be ready for use. The need for longer lasting bearings becomes increasingly important with today’s larger equipment. Not only does increased size bring more points of failure, but equipment is also moving through the fields faster as acres farmed per piece of equipment grows. EWS shows excellent wear properties in contaminated environments and can help move maintenance into off-season, preserving uptime in critical seasons.
MECHANICAL AND PHYSICAL PROPERTIES
|Ultimate Compression Strength (PSI)||70,000|
|Unit Load Limit (PSI)||30,000|
|Temperature Range (°F)||± 325|
|Coefficient of Thermal Expansion (in/in/°F)||4.8 x 10-6|
|Thermal Conductivity (BTU*in(hr*ft2*°F))||1.8-2.3|
|Water Absorption (2 Hours)||0.12%|
|Water Absorption (24 Hours)||0.16%|
|Specific Gravity||1.87 – 1.95|
|Maximum Velocity (SFM)||10|