# US 4,397,619 A · Hydraulic drilling motor with rotary internally and externally threaded members

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- Number: US 4,397,619 A
- Document ID: US4397619A
- Status: Granted
- Kind: A
- Application number: 06/130,563
- Filed: 1980-03-14
- Granted: 1983-08-09
- Earliest claimed: 1979-03-14
- Assignees: Orszagos Koolaj es Gazipari Troszt
- Inventors: Odon Alliquander; Lajos Natkai; Elek Ujfalusi
- Web page: https://patentgrep.com/patent/US4397619A

## CPC

- F04C 2/1071: {the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type}
- E21B 4/02: Fluid rotary type drives
- F04C 2/107: with helical teeth
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

There is disclosed an hydraulic drilling motor for well drilling. The motor is of the push-down axial flow type. It is of vibration-free rotary chamber-type construction functioning with high torque wherein the r.p.m. and capacity of the drilling tool are in proportion with the velocity and pressure of the flowing medium. The motor consists of an internally threaded chamber with an arch parallel with the flow direction of an externally threaded spindle of z.sub.o =z.sub.k (arch or thread)+1, or z.sub.o =z.sub.k -1 thread, of identical course with the chamber, arranged in the chamber. The cross section of the spindle or chamber is prolate, peaked or curate cycloid. When the spindle is cycloid cross sectional, the cross section of the chamber is in the same plane, and when the chamber is in cycloid cross sectional the cross section of the spindle is in the same plane. This is limited by the external or internal envelope curve of the surface touched by the cycloid during relative motion.

## Claims

### Claim 1

A hydraulic drilling motor with an external jacket and a driving shaft, for oil and water well drilling with axial flow, consisting of an internally threaded rotary chamber member seated on a thrust bearing of said motor, wherein
(a) the rotary axis of said chamber member is parallel to the direction of flow;
(b) a rotary externally double-threaded screw spindle having an elliptical cross-section is eccentrically arranged in said chamber member and is centrally arranged in relation to said external jacket and is rigidly fixed to said driving shaft; and
(c) the internal surface of said chamber member is a single arc epicycloid spiral surface.