Electrohydraulic servovalve for the control of a hydraulic actuator, in particular in servomechanisms controlling the flight of aircraft
US4858650A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1988 |
| Grant date | Aug 22, 1989 |
| Priority date | — |
| Expiry date | Apr 29, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86646
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The servovalve has in combination: PA0 (a) a rotary torque motor (1) having a limited angular movement; PA0 (b) a hydraulic distributor (2) capable of supplying fluid to the actuator and comprising a rotary shaft (10) coaxially connected to the torque motor (1); PA0 (c) a detector (3) of the angular position of the shaft (10) coaxial with said shaft, so that the motor (1), the distributor (2) and the detector (3) have their rotating parts (7, 10, 3a) coaxial and connected to rotate together; and PA0 (d) an adder (4) associated with an electronic amplifier (5) connected to the torque motor (1) and capable of receiving a given control voltage (E), the output of the detector (3) being connected to the input of the adder (4). This arrangement permits giving the same rotating movement to all the moving parts of the servovalve and consequently has the advantage of eliminating the play and friction which have an adverse effect on the precision and reliability of prior mechanisms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.