# US 9,038,762 B2 · Hydraulic steering > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,038,762 B2 - Document ID: US9038762B2 - Status: Granted - Kind: B2 - Application number: 11/714,364 - Filed: 2007-03-06 - Published: 2007-09-27 - Granted: 2015-05-26 - Earliest claimed: 2006-03-08 - Assignees: Sauer-Danfoss ApS - Applicants: Jan Vernersen; Ove Pedersen; Niels Bjarne Hansen - Inventors: Jan Vernersen; Ove Pedersen; Niels Bjarne Hansen - Web page: https://patentgrep.com/patent/US9038762B2 ## CPC - B62D 5/093: Telemotor driven by steering wheel movement (hydraulic steering gear B62D3/14) - B62D 5/062: {Details, component parts} - B62D: MOTOR VEHICLES; TRAILERS (steering, or guiding on a desired track, of agricultural machines or implements A01B69/00; wheels, castors, axles, increasing wheel adhesion B60B; vehicle tyres, tyre inflation or tyre changing B60C; connections between vehicles of a train or the like B60D; vehicles for use on rail and road, amphibious or convertible vehicles B60F; suspension arrangements B60G; heating, cooling, ventilating or other air treating devices B60H; windows, windscreens, non-fixed roofs, doors or similar devices, protective coverings for vehicles not in use B60J; propulsion plant arrangements, auxiliary drives, transmissions, controls, instrumentation or dashboards B60K; electric equipment or propulsion of electrically-propelled vehicles B60L; power supply for electrically-propelled vehicles B60M; passenger accommodation not otherwise provided for B60N; adaptations for load transportation or to carry special loads or objects B60P; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; vehicles, vehicle fittings or vehicle parts not otherwise provided for B60R; servicing, cleaning, repairing, supporting, lifting, or manoeuvring, not otherwise provided for, B60S; brake arrangements, brake control systems or parts thereof B60T; air-cushion vehicles B60V; motor-cycles, accessories therefor B62J, B62K; testing of vehicles G01M) ## Abstract The invention concerns a hydraulic steering (1) with a steering motor (8), a steering unit (2) with feedback behavior, a steering member activating the steering unit (2) and a shock valve arrangement (50) between the steering motor (8) and the steering unit (2). It is endeavored to enable changes of the feedback behavior in a simple manner. For this purpose it is ensured that a switchable feedback suppression device (9) is located at the side of the shock valve arrangement (50) facing away from the steering motor (8). ## Claims ### Claim 1 A hydraulic steering with a steering motor, a steering unit with feedback behaviour, a steering member activating the steering unit and a shock valve arrangement between the steering motor and the steering unit, wherein a switchable feedback suppression device is located at the side of the shock valve arrangement facing away from the steering motor. ### Claim 2 (depends on 1) The steering according to claim 1, wherein the steering unit has a housing in which the feedback suppression device is located. ### Claim 3 (depends on 2) The steering according to claim 2, wherein the shock valve arrangement is located in the housing. ### Claim 4 (depends on 1) The steering according to claim 1, wherein the steering unit has a measuring motor with a set of teeth forming several pressure chambers, each being connected to a valve arrangement via a pipe, the feedback suppression device having a stop valve in at least one pipe. ### Claim 5 (depends on 1) The steering according to claim 1, wherein the shock valve arrangement and the feedback suppression device are located in a common valve housing. ### Claim 6 (depends on 5) The steering according to claim 5, wherein the valve housing is arranged at the steering motor. ### Claim 7 (depends on 1) The steering according to claim 1, wherein the steering unit is connected to the steering motor via two working pipes, and the shock valve arrangement has an interrupt valve connecting the two working pipes and being biased in the closed position, the valve being acted upon in the opening direction by the higher of the pressures in the working pipes and connecting the two working pipes with each other in the open state. ### Claim 8 (depends on 1) The steering according to claim 1, wherein the feedback suppression device acts upon both working pipes. ### Claim 9 (depends on 1) The steering according to claim 1, wherein the feedback suppression device has a valve arrangement with electrical control inlet. ### Claim 10 (depends on 1) The steering according to claim 1, wherein the feedback suppression device has a valve arrangement with hydraulic control inlet. ### Claim 11 (depends on 1) The steering according to claim 1, wherein the shock valve arrangement can also be opened by the pressure from the steering unit. ### Claim 12 (depends on 10) The steering according to claim 10 wherein the control inlet is connected to an operation mode valve that supplies the control inlet with a higher or a lower control pressure in dependence of its activation. ### Claim 13 (depends on 9) The steering according to claim 9, wherein the valve arrangement has a biasing device, which acts against the pressure at the control inlet. ### Claim 14 (depends on 10) The steering according to claim 10, wherein a series connection of two change-over valves is located between two working pipes a connecting point of the two change-over valves being connected to the control inlet, each change-over valve having an outlet that is connected to the valve in the working pipe not connected to the change-over valve. ### Claim 15 (depends on 1) The steering according to claim 1, wherein a power assisted steering valve is arranged in parallel with the steering unit, the steering valve being connected to the working pipes in an area between the feedback suppression device and the steering motor. ### Claim 16 (depends on 12) The steering according to claim 12, wherein the operation mode valve is arranged in series with a pressure control valve. ### Claim 17 (depends on 10) The steering according to claim 10, wherein the steering unit has a load-sensing connection, whose pressure acts upon the valve arrangement against the pressure at the control inlet. ### Claim 18 (depends on 17) The steering according to claim 17, wherein the load-sensing connection is connected to an auxiliary valve that is located between a hydraulic servo line and a connection with higher pressure. ### Claim 19 (depends on 10) The steering according to claim 10, wherein the steering unit has a working pressure connection relieved in the neutral position of the steering unit to a low-pressure connection and, at a predetermined deflection of the steering unit, carrying 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. ### Claim 20 (depends on 10) The steering according to claim 10, wherein the steering unit is an “open-center” steering unit having a pressure connection that is connected to a counter-control connection, whose pressure acts upon the valve arrangement against the pressure at the control inlet.