Improved rotary directional-control valve for power-assisted steering mechanisms

Abstract

Abstract Translated from French DISTRIBUTEUR ROTATIF POUR MECANISMES DE DIRECTION ASSISTEE DU TYPE COMPORTANT DES ELEMENTS CYLINDRIQUES COAXIAUX 32, 33 SUSCEPTIBLES D'UNE ROTATION RELATIVE LIMITEE AUTOUR DE LEUR AXE COMMUN, DONT L'ELEMENT INTERNE 32 EST MONTE TOURNANT DANS L'ALESAGE DE L'ELEMENT EXTERNE 33, CE DERNIER ETANT MONTE TOURNANT DANS UN BOITIER FIXE 30, DANS LEQUEL LE CIRCUIT DE DISTRIBUTION DEFINI NOTAMMENT PAR CES ELEMENTS 32, 33 EST CONSTITUE PAR DES OUVERTURES ET DES CAVITES DE FLUIDE CONNECTEES ENTRE UNE SOURCE DE FLUIDE 15 ET UN RESERVOIR 17 ET QUI COMPORTE DEUX PRISES DE PRESSION DE TRAVAIL 18, 19 POUR LA REALISATION DES PASSAGES DE FLUIDE A SECTION VARIABLE OPERANT PAR RECOUVREMENT LORS D'UNE ROTATION RELATIVE LIMITEE DESDITS ELEMENTS 32, 33 ET L'OBTENTION D'UNE ELEVATION DE PRESSION DANS L'UNE OU L'AUTRE DES PRISES DE PRESSION DE TRAVAIL 18, 19, CARACTERISE PAR LE FAIT QUE L'UN DES DEUX CANAUX DE FUITE 43, 44 QUI DEBOUCHENT DANS UNE CHAMBRE CYLINDRIQUE 40 AUXILIAIRE DU BOITIER 30 DANS LAQUELLE EST MONTE A DEPLACEMENT L'ELEMENT ACTIF 41 D'UNE VANNE DE PASSAGE 42 DE DERIVATION QUI MET EN COMMUNICATION LESDITS CANAUX DE FUITE 43, 44 NOTAMMENT EN REPONSE AU CHANGEMENT DE LA VITESSE DU VEHICULE, EST ALIMENTE EN SERIE PAR L'ORIFICE DE PRESSION 18 AU TRAVERS D'UN ORIFICE REDUCTEUR DE DEBIT REGLABLE 48. ROTARY DISTRIBUTOR FOR POWER-ASSISTED STEERING MECHANISMS OF THE TYPE INCLUDING COAXIAL CYLINDRICAL ELEMENTS 32, 33 SUBJECT TO A RELATIVE LIMITED ROTATION AROUND THEIR COMMON AXIS, OF WHICH THE INTERNAL ELEMENT 32 IS MOUNTED TO ROTATE IN THE ALLOY OF THE EXTERNAL ELEMENT 33, THE LATTER BEING MOUNTED TO ROTATING IN A FIXED BOX 30, IN WHICH THE DISTRIBUTION CIRCUIT DEFINED IN PARTICULAR BY THESE ELEMENTS 32, 33 IS CONSISTED BY OPENINGS AND FLUID CAVITIES CONNECTED BETWEEN A SOURCE OF FLUID 15 AND A TANK 17 AND WHICH INCLUDES TWO WORKING PRESSURE TAPS 18, 19 FOR THE REALIZATION OF FLUID PASSAGES WITH VARIABLE SECTION OPERATING BY OVERLAP DURING A LIMITED RELATIVE ROTATION OF THE SAID ELEMENTS 32, 33 AND OBTAINING A PRESSURE RISE IN ONE OR L ' OTHER FROM THE WORKING PRESSURE TAPS 18, 19, CHARACTERIZED BY THE FACT THAT ONE OF THE TWO LEAK CHANNELS 43, 44 WHICH OPEN INTO AN AUXILIARY CYLINDRICAL CHAMBER 40 OF THE BOX 30 IN WHICH IS MOUNTED BY MOVEMENT THE ACTIVE ELEMENT 41 OF A BYPASS VALVE 42 WHICH PUT INTO COMMUNICATION THE SAID LEAK CHANNELS 43, 44 ESPECIALLY IN RESPONSE TO CHANGING THE VEHICLE SPEED, IS SUPPLIED IN SERIES BY THE PRESSURE Orifice 18 THROUGH AN ADJUSTABLE FLOW REDUCING ORIFICE 48.

Inventors

• 👤 Raymond Grancher
• 👤 Guy Bost

Bibliographic Details