Variable-ratio hydraulic steering system

Hydraulic steering device with translation ratio, which comprises cylinder connections, a control valve, and a metering pump, wherein the control valve includes a control piston, controllable by a steering wheel, and a control sleeve, mechanically connected to a rotor of the metering pump, and wherein the control piston and the control sleeve are furnished with channels cooperating and communicating with each other and with the metering pump, and wherein the metering pump has several displacement chambers, of which displacement chambers several are continuously connected to one of the cylinder connections, and the remaining displacement chambers are connected by a switching unit to either one of the cylinder connections or to a discharge connector,

• characterized in that a metering pump (10) is employed which has exclusively parallel-disposed displacement chambers with first and second lines (13, 13') of which first lines (13). one or several of the first lines (13), however at the most one less than the number of lines present, connect the metering pump (10) directly to one of the cylinder connections (7, 8), wherein the switching unit (16) is coordinated to the remaining second lines (13'), and wherein an adjustment unit of the switching unit (16), on the one hand, is subjected to the pressure present upstream of the metering pump (10), in the position connecting the metering pump (10) to one of the cylinder connections (7, 8) and, on the other hand, to the pressure present downstream of the metering pump (10), in the position connecting the metering pump (10) to the discharge connector (6) or to a feed connector (5).