Drive shaft assembly for a downhole motor

Details Drive shaft assembly for a downhole motor Drive shaft assembly for a downhole motor

2008-12-16

2011-10-11

Binda, Gregory (Department: 3679)

Rotary shafts, gudgeons, housings, and flexible couplings for ro

Flexible coupling between fluid-conducting rotary shafts

C464S115000, C464S120000, C464S152000, C464S155000, C029S428000

Reexamination Certificate

active

08033917

ABSTRACT:
A drive shaft assembly for a downhole motor includes a drive shaft formed with convexly spherical bearing surfaces on each end, and end housings with concavely spherical bearing surfaces for mating contact with the spherical bearing surfaces of the drive shaft, thereby facilitating omni-directional articulation between the drive shaft and the end housings while transferring axial thrust loads between the drive shaft and end housings across the interface of the mating spherical bearing surfaces. Torque is transferred between the drive shaft and end housings through two or alternatively four swivelling drive keys mounted to each end of the drive shaft and engageable with complementary drive key slots in the end housings. Full and constant torque-transferring contact is thus provided between the swivelling drive keys and the end housings irrespective of any angular offset between the drive shaft and the end housings, resulting from omni-directional articulation of the drive shaft relative to the end housing. The omni-directional center of rotation at each end of the drive shaft coincides with the geometric centerpoint of the corresponding convexly spherical bearing surface, which corresponds to the intersection of the drive shaft's rotational axis, the end housing's rotational axis, and the drive key swivel axis.

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International Preliminary Report on Patentability, The International Bureau of WIPO, Athina Nickitas-Etienne (Authorized Officer), Application No. PCT/CA2008/002193, Nov. 11, 2010 (5 pp).

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