Bottom-hole multistart screw motor
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United States of America Patent
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-
Feb 4, 1986
Grant Date -
N/A
app pub date -
Dec 10, 1980
filing date -
Dec 10, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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