Power section and transmission of a downhole drilling motor

  • US 9,546,518 B2
  • Filed: 02/25/2015
  • Issued: 01/17/2017
  • Est. Priority Date: 02/25/2015
  • Status: Active Grant
First Claim
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1. A power section for use in a downhole drilling motor, comprising:

  • a stator;

    a rotor disposed in the stator, wherein the rotor is configured to rotate a drive shaft of the downhole drilling motor via a transmission coupling disposed between the rotor and the drive shaft, wherein the rotor comprises a central bore formed through the rotor;

    a flex-shaft extending through the central bore of the rotor and coupled to the rotor to enable a transfer of axial thrust forces from the rotor to the flex-shaft, wherein the central bore and the flex-shaft define an annulus between the flex-shaft and an internal surface of the rotor; and

    a thrust bearing assembly comprising a housing coupled to the stator and a plurality of bearing elements coupled between the flex-shaft and the housing of the thrust bearing assembly, wherein the flex-shaft is centralized in the thrust bearing assembly via the plurality of bearings to support the rotor and to reduce a transfer of axial thrust forces from the rotor to the transmission coupling.

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