Hydraulic motor control system with rotating servo-valve

Details Hydraulic motor control system with rotating servo-valve Hydraulic motor control system with rotating servo-valve

1990-03-30

1990-12-18

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

91467, 13762523, 13762524, F15B 909, F15B 910

Patent

active

049778161

ABSTRACT:
A hydraulic control mechanism to control operating elements, such as a hydraulic motor, or hydraulic cylinder, employing presetting of a set point, for example via a stepping motor, and mechanical feedback of an actual value. Functional elements are provided in the form of rotary pistons that fit inside one another, rotating relative to one another, and serving for the sensitive regulation of the direction and quantity of a pressure medium stream that is supplied from a pressure medium source to the operting element and flows back therefrom to the tank. One rotary piston is positively connected with the presetting of the set point, and the other rotary piston is positively connected with the operating element for the mechanical actual value feedback. In this way, in contrast to known control mechanisms where a slide or seat valve is actuated by a longitudinal movement, the rotational movement of the set point and actual value are directly compared with one another. This results in a considerably greater precision both statically (positioning precision, concentricity) as well as dynamically (sequence trueness, path deviation). The control mechanism is a better overload safety device, has a simpler construction, and is more economical.

REFERENCES:
patent: 2349641 (1944-05-01), Tucker et al.
patent: 2395979 (1946-03-01), Tucker et al.
patent: 3185439 (1965-05-01), Inaba et al.
patent: 4779512 (1988-10-01), Leonard
patent: 4836249 (1989-06-01), LaPointe

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