| 摘要 |
An in-hole fluid motor assembly has a clutch engageable between the bearing housing and the drive shaft which is rotatable in the bearing housing, to connect the housing to the shaft and enable rotation of the bit by the housing. The clutch is engaged without increasing the load imposed on the bit. Drilling fluid in or flowing through the assembly and into the drive shaft is employed to hold the clutch disengaged while the circulating pump is running, and a spring normally acts to engage the clutch when the circulation of fluid is diminished by stopping the pump. In one form, the clutch may be automatically engaged if circulation is blocked and the pump continues to apply pressure to the fluid.
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