Hydraulic switching mechanism for mobile hydraulics, mobile...

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

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Details

F15B 13/04 (2006.01) F15B 13/02 (2006.01) F15B 13/042 (2006.01) F15B 13/043 (2006.01)

Patent

CA 2760497

The invention relates to a hydraulic switching mechanism (10) for the mobile hydraulics of, for example, hydraulic excavators, with a valve block, with electrohydraulically activatable valve units for controlling the movement of a working cylinder (6) whose cylinder chambers (ZA, ZB) can be selectively connected to a pump connection (P) for hydraulic fluid, to a tank connection (T) or to one another, and with pre-control valves for activating the valve units, wherein the hydraulic switching mechanism, by means of separate tank valve units (C2, C4) and pump valve units (C1, C3 ) according to the invention, and also a suitable pre-control system (7), makes it possible to achieve not only a directional control valve function but also to achieve a directly controlled and superimposed pre-controlled lowering braking function, a maximum pressure safeguarding of the cylinders and a proportional throttle valve function for the controlled displacement under negative load forces in the direction of movement and braking in an emergency. Furthermore, the invention also relates to mobile hydraulic machines having such a hydraulic switching mechanism and also to valve units therefor.

La présente invention concerne un mécanisme de commutation hydraulique (10) pour circuits hydrauliques mobiles, de pelles hydrauliques par exemple, comprenant : un bloc soupape ; des unités de soupapes activables électro-hydrauliquement pour commander le mouvement d'un vérin de travail (6) dont les chambres de vérin (ZA, ZB) peuvent être sélectivement raccordées à un raccord de pompe (P) pour fluide hydraulique, à un raccord de réservoir (T), ou autre ; et des soupapes de précommande pour activer les unités de soupapes. Le mécanisme de commutation hydraulique, au moyen d'unités de soupapes de réservoir séparées (C2, C4) et d'unités de soupapes de pompe (C1, C3 ) selon l'invention, et au moyen également d'un système de précommande approprié (7), permet la réalisation non seulement d'une fonction commande de soupape directionnelle, mais également d'une fonction freinage d'abaissement commandée directement et précommandée en superposition, d'une sauvegarde de pression maximale des vérins, et d'une fonction soupape de pression d'accélération proportionnelle pour le déplacement commandé en cas de forces de charges négatives dans le sens du mouvement et de freinage en urgence. En outre, l'invention concerne également des machines hydrauliques mobiles dotées d'un tel mécanisme de commutation, ainsi que leurs unités de soupapes.

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