Hydraulische Steueranordnung für eine mobile Arbeitsmaschine, insbesondere für einen Radlader, zur Dämpfung von Nickschwingungen

摘要

The invention relates to a hydraulic control mechanism for a mobile machine tool, especially a wheel loader, for damping longitudinal oscillations. The inventive hydraulic control mechanism comprises at least one hydraulic cylinder (12) which helps to move a working tool, a directional control valve (11) for controlling the paths of the hydraulic fluid between a pressure chamber (15) of the hydraulic cylinder (12), a source of hydraulic fluid and a tank (27), and a hydraulic accumulator (21) which can be connected to a source of hydraulic fluid by means of a filling valve (22; 71) located in a filling line (20), whose charge pressure can be increased to a maximum pressure by means of said filling valve (22; 71) and which can be connected to the pressure chamber (15) of the hydraulic cylinder (12) in order to dampen the longitudinal oscillations. The inventive mechanism also has a shut-off valve (22; 75) which can be moved into a through position in which hydraulic fluid can flow through from the hydraulic accumulator (21) to the pressure chamber (15) of the hydraulic cylinder (12) and vice versa, when a first condition is fulfilled. According to the invention, the shut-off valve (22; 75) can also be moved into its shut-off position when the first condition is fulfilled in the event that the charge pressure in the pressure chamber (15) of the hydraulic cylinder (12) or the accumulator pressure reaches a maximum pressure.