Bottom-hole multistart screw motor

Details Bottom-hole multistart screw motor Bottom-hole multistart screw motor

1980-12-10

1986-02-04

Novosad, Stephen J.

Boring or penetrating the earth

With below-ground tool drive prime mover

Fluid rotary type

418 48, E21B 402

Patent

active

045679533

ABSTRACT:
A multistart helical planetary gear motor, comprising a stator 3 having an internal helical thread and a rotor 4 having an external helical thread and arranged eccentrically within the stator 3. The rotor 4 and stator 3 form a kinematic couple which is in permanent engagement similarly to an internal gearing, with the number of the stator teeth being greater than the number of rotor teeth by unity. The ratio of pitches of the helical threads of the stator 3 and the rotor 4 is directly proportional to the ratio of their respective numbers of teeth. The ratio of pitches of the helical surfaces of the stator 3 and the rotor 4 to their respective pitch diameters ranges substantially from 5.5 to 12.

REFERENCES:
patent: 3112801 (1963-12-01), Clark et al.
patent: 3982858 (1976-09-01), Tschirky
patent: 4187061 (1980-02-01), Jurgens
patent: 4397619 (1983-08-01), Alliquander et al.

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