Hydraulic steering

Abstract

The invention concerns a hydraulic steering (1) with a steering unit (2) with feedback behaviour, a steering motor (8) connected to the steering unit (2) via working pipes (L, R), a steering member (6) and a feedback suppression device (9), which is located in at least one working pipe (L, R). It is endeavoured to change the feedback behaviour of such a steering in a simple manner. For this purpose, the feedback suppression device (9) has a valve arrangement (10) with hydraulic control inlet (C).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

In the following, the invention is described on the basis of preferred embodiments with reference to the drawings, showing:

FIG. 1 is a first embodiment of a hydraulic steering with feedback suppression device,

FIG. 2 is a modified embodiment of a feedback suppression device,

FIG. 3 is a third embodiment of the feedback suppression device,

FIG. 4 is a fourth embodiment of the feedback suppression device,

FIG. 5 is a fifth embodiment of the feedback suppression device,

FIG. 6 is a second embodiment of a steering,

FIG. 7 is a third embodiment of a steering,

FIG. 8 is a fourth embodiment of a steering,

FIG. 9 is a modification of the feedback suppression device according to FIG. 8,

FIG. 10 is a second modification of the feedback suppression device according to FIG. 8,

FIG. 11 is a fifth embodiment of a steering,

FIG. 12 is a sixth embodiment of a steering,

FIG. 13 is a seventh embodiment of a steering,

FIG. 14 is a schematic view explaining the S-signal, and

FIG. 15 is an eighth embodiment of a steering.

Claims

1. A hydraulic steering with a steering unit with feedback behaviour, a steering motor connected to the steering unit via working pipes, a steering member and a feedback suppression device, which is located in at least one working pipe, wherein the feedback suppression device has a valve arrangement with hydraulic control inlet.

2. The steering according to claim 1, wherein the valve arrangement can also be opened by a pressure from the steering unit.

3. The steering according to claim 1, wherein the control inlet is connected to an operation mode valve supplying the control inlet with a higher or a lower control pressure in dependence of its activation.

4. The steering according to claim 1, wherein the valve arrangement has a pretensioning device, which acts against the pressure at the control inlet.

5. The steering according to claim 1, wherein for each working pipe the valve arrangement has a valve that interrupts the working pipe in a predetermined state.

6. The steering according to claim 5, wherein a series connection of two two-way valves is located between the two working lines, the connecting point of said two-way valves being connected to the control inlet, each two-way valve having an outlet that is connected to the valve in the working pipe not connected to the two-way valve in question.

7. The steering according to claim 5, wherein a pressure relief valve is allocated to each valve that can be opened by both the pressure at the control inlet and the pressure in the respective other working pipe, and in the opened state connects a closing pressure side of the valve with the related working pipe.

8. The steering according to claim 1, wherein a power assisted steering valve is connected in parallel to the steering unit, the steering valve being connected to the working pipes in an area between the feedback suppression device and the steering motor.

9. The steering according to claim 1, wherein the operation mode valve is arranged in series with a pressure control valve.

10. The steering according to claim 1, wherein the steering unit has a load-sensing connection, whose pressure acts upon the valve arrangement against the pressure at the control inlet.

11. The steering according to claim 10, wherein the load-sensing connection is connected to an auxiliary valve that is located between a pilot control pipe and a connection with a higher pressure.

12. The steering according to claim 1, wherein the steering unit has a working pressure connection, relieved in the neutral position of the steering unit to a low-pressure connection and carrying at a predetermined deflection of the steering unit the pressure ruling in the deflected working pipe, a pressure at the working pressure connection acting upon the valve arrangement against the pressure at the control inlet.

13. The steering according to claim 1, wherein the steering unit exists in the form of an “open-center” steering unit and has a pressure connection, which is connected to a counter-control connection, whose pressure acts upon the valve arrangement against the pressure at the control inlet.