DOWNHOLE MOTOR SPINDLE Russian patent published in 2011 - IPC E21B4/02 

FIELD: construction.

SUBSTANCE: spindle comprises a body (1), a hollow shaft (6) installed in it, a connecting coupling (7) with windows (8) to let working fluid through, circular seals at the inlet (11) and outlet, radial and axial supports (24), and also a row of adapters. Radial and axial supports are installed between circular seals (11). At the inlet to the spindle below the windows (8) for letting working fluid through there is an activator (10) to delay coarse abrasive particles. The circular seal (11) is made in the form of a hollow bushing opened at one side made of composite material, on the external and internal surfaces of which there are ridges arranged with the possibility of tension along the bore of the body (1) and the external surface of the hollow shaft (6). In the open slot of the bushing there is an elastic insert installed to form a cavity for lubricant material, which is joined by radial channels of the bushing with the external surface (20) of the shaft (6). At the same time along the end surfaces of the bushing and the insert there are safety rings installed with a radial gap Δ along the external and internal surfaces of coupling, and in one of the adapters (4) there is an inner collar (27).

EFFECT: increased resource and efficiency of the spindle by improvement of axial and radial supports tightness.

9 dwg