Roller Cone Bits - Oil & Gas Products 2006-2007 - Varel International

J o u r n a l B e a r i n g F e a t u r e s
For sizes up to 13 ¾" (349.2 mm)
Ball Retention
The Challenger bearing features ball retention, designed
to retain the cone without carrying bit weight. This design
technique prevents ball race spalling failures and extends
bearing life.
Thermally Stable Extreme Pressure (EP) Lubricant
Challenger bearings utilize a thermally stable EP lubricant
formulated to work synergistically with the bearing materials.
The lubricant maintains high relative viscosity even when the
bearings are subject to extreme energy levels in demanding
applications.
Hardmetal Inlays
Hard metal inlays on critical bearing surfaces are precisionmachined
to provide superior bearing performance by reducing
friction and wear.
Precision, Silver-Plated Floating Elements
All bearing surfaces feature precision, silver-plated floating
elements between the cone and head-bearing surfaces. These
floating elements reduce bearing heat generation and prolong
bearing life at higher rotary speeds.
Image shown is a
journal bearing with
Steel Tooth cutting
structure. Also available
with TCI cutting
structure.
HSN High Aspect Ratio Seal
The Challenger seal design provides positive sealing against
contaminates with lower seal face contact stresses. This
reduces the seal operating temperature and extends seal life.
Shale Diverting Insert/Shale Groove
Challenger bits feature an innovative, stepped shale burn
insert. This stepped design is more effective in diverting
cuttings away from the seal, prolonging seal life.
Actual photo of the shale
diverting insert/shale groove.
Bearing Clearance
During assembly, components are selectively matched
so that final bearing clearances are within a narrow,
controlled range. This practice dramatically improves bearing
performance and bit consistency.
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