Abstract: An in-hole motor drill assembly has the rotor of the motor connected to the drill bit and a housing connected to the running string, and normally disengaged torque transmitting members between said housing and said drill bit provide for engaging said bit and running string for mutual rotation, by pulling on the running string. The torque transmitting members are locked in engagement, enabling the tension on the drill pipe string to be relieved, and the bit can be rotated by rotation of the drill pipe string in either direction. The usual pick-up bearing between the housing and the shaft provides an abutment for a releasable thrust transmitting member which normally holds the clutch disengaged.

Abstract: A bearing assembly, for a drive shaft connected to an in-hole motor rotor to drive a bit and a housing connected to the motor stator has sets of oppositely acting thrust bearings having corresponding members of bearings and parts at opposite sides of a thrust member on the shaft. Plural sets of thrust bearings are shown between spaced radial bearings to optimize load distribution.