REDUCER-SPINDLE OF DRILL DOWNHOLE MOTOR Russian patent published in 1994 - IPC

FIELD: well drilling. SUBSTANCE: reducer-spindle has oil-filled body with nipples. Arranged inside body are drive shaft with bearing unit, reducing unit, driven shaft with bearing unit, radial support with nipple, system of lubrication and packings with piston compensator, and end-face seals. Device for filling lubricant is made in form of holes with plugs and check valve. Hole with plug and check valve are made in lower part of nipple. Oil-filled chamber is communicated with hole having check valve through channel. Channel outlet is located above lower end face seal. EFFECT: higher efficiency. 3 dwg