Danfoss Power Solutions Aps

Sauer Danfoss Aps

Jens Vester

Tom Rudolph

Poul Ennemark

Tom Tychsen

Morten Hoeck Petersen

Soeren Liljenberg

Niels Bjarne Hansen

Thomas Traeger Hansen

Søren Pedersen

Henrik Hjorth

A hydraulic steering arrangement includes a supply port arrangement having at least a supply port, a return port arrangement having at least a return port, a working port arrangement having two working ports, a first valve arrangement having a first supply side connected to the supply port arrangement and a first output side connected to the working port arrangement, a second valve arrangement having a second supply side connected to the supply port arrangement and a second output side connected to the working port arrangement, and a steering command device. In a neutral steering angle, the second valve arrangement connects the first output side to the return port arrangement and the first valve arrangement connects the second output side to the return port arrangement.

Hydraulic steering arrangement

A hydraulic steering arrangement () comprising a supply port arrangement having a pressure port and a tank port, a working port arrangement having two working ports (L, R), a mechanical steering unit () connected to a steering wheel () and being arranged between the supply port arrangement and the working port arrangement (L, R), supply valve means () having a connection to the pressure port and to the working port arrangement (L, R) and being controlled by a controller (), and a steering wheel sensor () connected to the controller () is described. Such a steering arrangement could allow a comfortable feeling for the driver. To this end the steering wheel sensor () is mounted in a position of minimum play to steering wheel () and steering wheel sensor () and detects a beginning of a movement of the steering wheel (), wherein the controller () actuates the supply valve means () upon beginning of the movement, and the supply valve means () supply hydraulic fluid to the working port arrangement (L, R).

A hydraulic steering system () is provided having a steering device () and a symmetrically acting steering motor (), said steering device () comprising a supply port arrangement having a high pressure port (P) and a low pressure port (T), a working port arrangement having two working ports (L, R), a control valve (), two working lines () each connecting said control valve () with one of said working ports (L, R), and a measuring motor (). Such a hydraulic steering system should show a comfortable steering behavior. To this end said measuring motor () is arranged in one of said working lines ().

Hydraulic steering system

A hydraulic steering system () is described comprising a first steering circuit () and a second steering circuit (), each of said steering circuits () comprising a steering device () and a steering motor () connected to said steering device (), each of said steering devices () comprising a supply port arrangement having a high pressure port (Pa, Pb) and a low pressure port (Ta, Tb), a working port arrangement having two working ports (La, Ra; Lb, Rb) connected to said steering motor (), a control valve (), and a measuring motor (). Such a steering system should have a comfortable steering behavior. To this end in each of said steering devices () said measuring motor () is arranged in a working line () between said control valve () and one of said working ports (La, Ra; Lb, Rb).

The invention concerns a valve arrangement () with a high-pressure connection (P), a low-pressure connection (T), at least one control valve (to), which is accommodated in a control valve module and has at least one working connection (A, B) for a hydraulic consumer (to), and a safety valve (), which is accommodated in a safety valve module, and which releases or blocks a passage between the high-pressure connection (P) and the control valves (to), the control valve module (to) and the safety valve module () being connected to one component group. It is endeavoured to provide a valve arrangement with a high safety level. For this purpose, it is ensured that each control valve (to' to&#x2032;) has an error detection device (), that the safety valve module () has a safety switch device () and that the component group has a connection () between the safety switch device () and the error detection device ().

Valve arrangement

The invention concerns a valve arrangement () with at least two valve modules (), each having a valve element, whose position can be changed by means of an actuator (), and to which a position sensor () is allocated, a line arrangement () being connected with the valve modules (), through which control signals can be transmitted to the valve modules (). It is endeavoured to increase the safety of such valve modules. For this purpose, at each valve module (to) the actuator () is provided with a control device (), which is connected with the position sensor () and evaluates control signals for the valve module (to) concerned, that at least the control device () of a first valve module () additionally evaluates the control signals for another, second valve module (), and that this control device () receives signals from the position sensor () of the second valve module ().

Growing community of inventors

Soenderborg, Denmark

Jens Vester