Danfoss Power Solutions Aps

Rene Andersen

Niels Arbjerg

Abdul Karim Rahimzai

A hydraulic steering device is provided comprising a supply port arrangement having a pressure port (P) and a tank port (), a working port arrangement having two working ports (L, R), a main flow path () between the pressure port (P) and the working port arrangement, a return flow path () between the working port arrangement and the tank port (), flow meter means () being arranged in said main flow path (), an amplification flow path () being arranged in parallel to said main flow path (), said amplification flow path () being connected to said main flow path () downstream said flow meter means () in a direction from said pressure port (P) to said working port arrangement. A risk of dangerous situations in case of jamming of the flow meter should be reduced. To this end pressure increasing means are provided increasing a pressure over said flow meter means () in case a flow through said main flow path () is blocked by said flow meter ().

Hydraulic steering device

A hydraulic steering arrangement () is provided comprising a static steering unit () and an adjustable pressure source () connected to a pressure port () of said steering unit () and having a load sensing port (). Such a steering unit should enable a fast reaction of the steering unit. To this end said pressure source () is a dynamic pressure source having an orifice (Adyn) outputting hydraulic fluid to said load sensing port (), a load sensing line () connecting said load sensing port () and a low pressure port (), a control valve () being arranged in said load sensing line () between said load sensing port () and said low pressure port (), said control valve () being actuated by a control pressure within said steering unit () and throttling a flow through said load sensing line () depending on said control pressure.

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Soenderborg, Denmark

Rene Andersen