A sealed bearing roller cone rock bit (10) is disclosed having precision roller bearings (44) with very close fits. The bearing package includes highly refined and hardened surface finishes, special roller bearing metal materials and lubricants with specific lube viscosities.
申请公布号
DE3875074(D1)
申请公布日期
1992.11.05
申请号
DE19883875074
申请日期
1988.10.21
申请人
SMITH INTERNATIONAL, INC., IRVINE, CALIF., US
发明人
CROCKETT, DAVID PRESTON, MISSION VIEJO CALIFORNIA 92691, US;HOOPER, MICHAEL E., MISSION VIEJO CALIFORNIA 92692, US;ERPENBECK, GERRARD PAUL, COSTA MESA CALIFORNIA 9269, US
