Low thermal expansion for dimensional stability
PolyLube® HT is a high load, low RPM bearing designed for applications where self-lubrication is desired, but conventional composite bearings will not perform under high temperatures. This product has been designed to provide excellent performance at elevated temperatures. With a higher glass transition temperature than standard, this epoxy filament wound structure exhibits superb performance over extended exposure to elevated temperatures. The bearing material is focused on applications where the bearing will be exposed to temperatures up to 475°F (245°C).
But Snowmobiles are Cold!
PolyLube High Temperature applications are not just for elevated temperature environments but also for applications where the bearing may need to resist thermal expansion during operation. One example of this is in snowmobile clutch markets. In these applications, the clutch speed goes from 0 to very high RPM's in micro-seconds (and vice versa). During this cycling, friction is rising because speed is being dramatically increased. As the friction goes up so does the temperature of the associated components. A high temperature composite bearing material can resist these expansion phenomena and as a result offer better long term wear, improved bearing durability, and less seizure opportunity than conventional metal bearing materials.
No greasing needed
In addition to its high compressive properties (in both static and dynamic modes), the bearing material is inherently self-lubricating. The self-lubrication capability of Polygon’s new material means that the use of expensive high temperature external lubricants such as polyurea grease, lithium grease, some bentone greases, as well as advanced ester based oils and complex thickening systems may no longer be necessary.
The PolyLube HT bearing creates a high strength, self-lubricating journal bearing material that can offer performance enhancements over greased systems, as well as graphite loaded bronze structures, some iron-copper graphites, polysulfone, PEEK, and polymide bearing materials.
This bearing is based on the same filament wound structure as the PolyLube MRP bearing and has the same wear liner. The result is that the HT bearing has a high static and dynamic load capacity. The HT bearing is also inherently self-lubricating through the same film transfer process.
The result of a higher temperature resin matrix, the same high strength filament wound backing, and the same self-lubrication process combine to make the HT bearing an ideal solution for high temperature applications.
|Ultimate Compression Strength||70,000 psi||483 MPa|
|Unit Load Limit||30,000 psi**||206.8 MPa**|
|Temperature Range||-350 to 475 °F||-163 to 245°C|
|Water Absorption as % weight produced (2 hours)||0.12||0.12|
|Water Absorption as % weight produced (24 hours)||0.16||0.16|
|Maximum Velocity (w/ Glass Tape liner)||80 sfm||0.41 m/s|
* These are typical properties. Specific properties may vary, depending on the composite design for each application.
**Polygon's proprietary process of fiberglass filament winding results in exceptionally strong structures to support the PolyLube wear surface. Loading in excess of 30,000 PSI (307 MPa) can be tolerated in specific applications. A more general design approach for applications with oscillating pins and angular force vector change less than 45 degrees should be designed to an average working pressure of 8,000 psi (55 MPa). Polygon MRP bearings will allow pressure spikes as high as 12,000 PSI (83 MPa) during approximately 5% of the operational life.
Please consult with a Polygon Application Engineer for any questions regarding loading conditions and bearing performance.
Any ratings are typical for design purposes. Your design parameters may affect final ratings. Consult with a Polygon sales engineer for guidance. Final testing and approval is the customer's responsibility for their application. This information is derived from our testing and published data. There is no assurance of these properties, or warranty provided that these products are suitable for any particular purpose or operational situation.
Polygon certifies that their product will be free from material defect. Polygon will not accept any liability for loss, damages, or costs from use or misuse of our products.
Specifications are subject to change, and may be affected by our continual process of improvement. Changes may be made without prior announcement.