Gearbox assembly for deep oil well pumps

Abstract

Featured is a gearbox used to interconnect an electric motor to a deep oil well tube pump. The gearbox includes a drive shaft interconnected to the pump, a reduction gear assembly interconnected to the drive shaft and the electric motor, a bearing system that axially and radially supports rotating members of the reduction gear assembly, a lubrication system and a compensator that is fluidly coupled to the lubrication system. The compensator provides pressure compensation between the pressure external to the gearbox and the internal pressure of the lubrication system. The reduction gear assembly includes one or more stages of planetary gearing, wherein a final planet stage includes three or more planet wheels, a pinion cage and a pinion cage member. The bearing system includes a bearing sub-assembly for supporting the final planet stage, the bearing sub-assembly including a plurality of axial and radial bearings.

Dependencies are inferred from the claim text.