Patent ID: 9206821
Filing Date: 2015-12-08
Classification: F15B,Y10T

Abstract:
1. A hydraulic switching mechanism for the mobile hydraulics of a mobile hydraulic machine, comprising: a valve block; electrohydraulically activatable valve units arranged in the valve block for controlling the movement of a working cylinder, the working cylinder having two oppositely acting cylinder chambers configured to connect via first and second cylinder chamber connections to the valve block, the first and second cylinder chamber connections being selectively connectable to a pump connection for hydraulic fluid, to a tank connection, or to one another, wherein the electrohydraulically activatable valve units comprise: a pilot valve system comprising a plurality of pilot valves configured to implement a directional control function to control a direction of the movement of the working cylinder, a lowering braking function to control a sequence of the movement of the working cylinder, and a pressure-limiting function, each via control of the first cone-seat valve, the second cone-seat valve, the third cone-seat valve, the fourth cone-seat valve, or a combination thereof, wherein the pressure-limiting function and the lowering braking function are pressure-dependent as a function of the pressure in the first and second cylinder chamber connections via control of the tank valve unit and the second tank valve unit.