High Pressure Thrust Bearings: An Application

摘要

Successful operation of a 50 kb-1000C rock deformation shear press depends on frictionless operation of two thrust bearings; an upper bearing must transmit undiminished 30,000 inch-pounds of torque to a mineral test specimen, and the lower bearing must permit free rotation of a torque measuring arm under maximum torques of 7000 inch-pounds. Upper bearing friction coefficients as low as 0.01 result when colloidal bonded films containing 65 percent pure MoS2 in an alkyd resin are used with MoS2 greases. The torque arm bearing is lubricated with 0.01 inch thick Teflon sheet to obtain friction coefficients below 0.016. Bearing pressures occasionally exceed 100,000 psi in both bearings, however no evidence of galling, seizing or wear have developed on any thrust plate. Torque losses do not exceed 5 percent of the transmitted value in the upper bearing and 3.5 percent in the lower bearing. (Author)