Hydraulic system

F - Mech Eng,Light,Heat,Weapons – 15 – B

Patent

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Details

F15B 11/20 (2006.01) E02F 9/22 (2006.01) F15B 11/05 (2006.01)

Patent

CA 2214209

The invention concerns a hydraulic system (1) with a pressure source (2, 3) controllable via a load sensing signal, a pressure sink (4), at least two working sections (6, 7), each having a hydraulic consumer (8, 18) and a control valve (9, 9') with a load sensing signal connection (19, 20; 19', 20') and at least one back-pressure valve (17) arranged in a tank pipe between the control valve (9, 9'9 and the pressure sink (4). In such a system the pressure required from the pump in the neutral position must be as low as possible. On the other hand, however, oscillations should not occur, when an external force acts on another hydraulic consumer in the neutral position of a control valve. In the neutral position of the control valves (9, 9') the load sensing signal connection ( 19, 20; 19' 20') is therefore connected with the pressure sink (4) via an auxiliary tank pipe (23, 23', 23"; 29) by-passing the back-pressure valve (17).

Cette invention concerne un système hydraulique (1) qui comporte une source de pression (2, 3) réglable au moyen d'un signal provenant d'un détecteur de charge, un détendeur (4) et au moins deux sections de travail (6, 7), chacune équipée d'un organe hydraulique (8, 18) et d'un régulateur (9, 9') à prise de détection de charge (19, 20; 19', 20') et régulateur de contre-pression (17) montés dans un tuyau entre le régulateur (9, 9') et le détendeur (4). Dans un tel système, la pression appelée d'une pompe en position neutre doit être la plus faible possible. Par contre, il ne devrait pas s'y produire de battement lorsqu'une force extérieure agit sur un autre organe hydraulique alors que le régulateur est en position neutre. Les régulateurs (9, 9') étant en position neutre, la prise de détection de charge (19, 20) est connectée au détendeur (4) via un tuyau auxiliaire (23, 23', 23"; 29) contournant le régulateur de contre-pression (17).

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