TURBODRILL REDUCTION GEAR Russian patent published in 1997 - IPC

FIELD: drilling equipment, in particular, reduction gears of downhole motors. SUBSTANCE: reduction gear consists of body accommodating transmission mechanism which includes driving shaft and driven shaft made in form of cylinder accommodating impellers made to fully close the clearance and alternating with impellers installed in driving shaft, also closing the clearance. Installed between driving and driven shafts are upper and lower supports. Installed above upper support is seal. Driving shaft is connected with shaft of turbine section, and driven shaft is connected with spindle shaft. EFFECT: higher efficiency of operation with its arrangement in relatively small in diameter and extended body of turbodrill. 2 dwg