| 摘要 |
The present invention relates to an electrohydraulic servovalve possessing at least one variable constriction controlled by a low-powered electric signal in a manner such as to control a flow-rate or a hydraulic pressure. The servovalve according to the invention possesses at least one nozzle which is fixed in a body and fed with hydraulic liquid, and it is essentially characterised in that it comprises a piezoelectric transducer (3) constituted by at least one elementary transducer (31) formed by a piezoelectric ceramic pellet clamped between two electrodes and held in the body (2) opposite the aperture of the nozzle (11 or 12), substantially perpendicular to the axis (13) of this nozzle, in a manner such that the deformation of the transducer (3) under the action of an electrical signal applied to the electrodes modifies the distance between the aperture of the said nozzle (11, 12) and the transducer (3). This servovalve constitutes a single or double hydraulic potentiometer or a variable choke. <IMAGE>
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