Hydraulic motor with variable speed

Details Hydraulic motor with variable speed Hydraulic motor with variable speed

1978-11-20

1980-09-09

Vrablik, John J.

Rotary expansible chamber devices

Unlike helical surfaces on relatively wobbling rotating...

418166, 175107, F03C 200, E21B 402

Patent

active

042215528

ABSTRACT:
A hydraulic motor is disclosed using the helical gear elements as taught by Moineau in his early patents, as for example, U.S. Pat. No. 1,892,217 of Dec. 27, 1932. In the present invention the internal element of the Moineau pair is held against gyration but is permitted to rotate freely. The outer member of the Moineau gear pair is caused to turn without gyration when fluid is pumped through the motor. Compared with conventional Moineau gear pair motors, the volume of liquid to be pumped through the motor is reduced by 50% and therefore the fluid may be pumped at a higher pressure than is available with current Moineau gear pair motors. If the pressure is doubled, then the torque put out by the motor is doubled. While the device is useful in various applications, it is of particular value in connection with well drilling down-hole motors.

REFERENCES:
patent: 3443482 (1969-05-01), Lummus et al.
patent: 3938915 (1976-02-01), Olofsson
patent: 4080115 (1978-03-01), Sims et al.

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