Valve actuator differential worm planetary gear drive

Details Valve actuator differential worm planetary gear drive Valve actuator differential worm planetary gear drive

1989-08-07

1991-02-19

Herrmann, Allan D.

Planetary gear transmission systems or components

Input from independent power sources

Including manual input

74458, 25112903, 475 7, F16H 132, F16H 3706, F16H 5522

Patent

active

049940015

ABSTRACT:
A valve actuator differential worm planetary gear drive provides forward or reverse motion to a valve stem, from an input from either a motor-driven worm or a handwheel drive worm, by using a plurality of planet gears to send motion to the sun gear. If the preference is to have the motor drive the valve primarily, the manual worm stays locked and the motor worm acts as a planetary arm. When it is desired to move the valve by hand, the motor gear is fixed and rotation of the handwheel worm gear transmits the power through the ring gear and the planet gears to the drive sleeve.

REFERENCES:
patent: 1793228 (1931-02-01), Hackethal
patent: 2955486 (1960-10-01), Bacchi
patent: 3422704 (1969-01-01), Catlett
patent: 4261224 (1981-04-01), Sulzer
Gear Design, Article extracted from p. 53, Richard C. Bryant and Darle W. Dudley, prior 1970, "Self-Locking Characteristics".

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