Drive line for down hole mud motor

Details Drive line for down hole mud motor Drive line for down hole mud motor

2007-03-06

2007-03-06

Dunwoody, Aaron (Department: 3679)

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

Flexible coupling between fluid-conducting rotary shafts

Relative angular displacement of axes of shafts

C464S155000

Reexamination Certificate

active

11119198

ABSTRACT:
A drive line for a down hole mud motor has a plurality of elongate keys extending radially from an exterior surface of a central shaft for the purpose of transmitting torque. A plurality of circumferentially spaced axial keyways are provided in an interior surface of each end housing, which are adapted to receive the keys. Each of the keys has opposed sides, opposed ends and a front face. The front face is radiused both in a first direction between the opposed ends and in a second direction between the opposed sides, thereby accommodating the omni-directional pivotal movement of the shaft relative to the housing. The use of keys for torque transmission increases available contact area, with a corresponding increase in torque load capacity.

REFERENCES:
patent: 4772246 (1988-09-01), Wenzel
patent: 5267905 (1993-12-01), Wenzel et al.
patent: 5588818 (1996-12-01), Houmand et al.

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