Inventors:
Gregory Wayne Peterson - Arlington TX, US
Anthony D. Podnieks - Plano TX, US
Tim Chu - Greenville SC, US
Elisabeth Smith - Kulpsville PA, US
Janice David - Plymouth MI, US
Assignee:
ATLAS COPCO SECOROC LLC - Grand Prairie TX
SKF USA, INC. - Kulpsville PA
International Classification:
E21B 10/22
E21B 10/00
B23P 11/00
E21B 10/20
E21B 10/62
Abstract:
An earth bit includes a cone rotatably mounted to a shaft with a hub unit and thrust roller bearings. The hub unit is moveable between mounted and unmounted positions on the shaft, as a single unit, in a repeatable manner. The hub unit includes a pair of roller bearings positioned between inner and outer races. The outer race includes a recess extending around its outer periphery. A sealing structure is slidingly engaged with the recess to provide a seal between the cone and shaft.