# US 10,308,280 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 10,308,280 B2 - Document ID: US10308280B2 - Status: Granted - Kind: B2 - Application number: 15/381,213 - Filed: 2016-12-16 - Published: 2017-10-19 - Granted: 2019-06-04 - Earliest claimed: 2016-04-13 - Assignees: Danfoss Power Solutions ApS - Applicants: Danfoss Power Solutions ApS - Inventors: Morten Hoeck Petersen; Thomas Træger Hansen; Thomas Bauer; Niels Bjarne Hansen; Jeroen Hinse - Web page: https://patentgrep.com/patent/US10308280B2 ## CPC - B62D 5/093: Telemotor driven by steering wheel movement (hydraulic steering gear B62D3/14) - B62D 1/22: Alternative steering-control elements, e.g. for teaching purposes - B62D 3/14: hydraulic - B62D 5/09: characterised by means for actuating valves - 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 Hydraulic steering (1) is disclosed comprising a high pressure port (P), a low pressure port (T), two working ports (CL, CR), a manual steering section (3), and a steering valve section having a steering valve 5 and a hydraulic driving arrangement (6) adjusting hydraulically a position of said steering valve. A change from automatic steering to manual steering should be reliably ensured when the manual steering section is directly influenced by a driver. To this end, a switching valve (11) is provided, which is actuatable between a first position in which said driving arrangement (6) is supplied with hydraulic fluid under pressure, and a second position in which a supply of hydraulic fluid to said driving arrangement (6) is interrupted, wherein said switching valve (11) is hydraulically actuated into said second position by a pressure generated upon actuating of said manual steering section (3). ## Claims ### Claim 1 A hydraulic steering comprising a high pressure port (P), a low pressure port (T), two working ports (CL, CR), a manual steering section and a steering valve section having a steering valve and a hydraulic driving arrangement adjusting hydraulically a position of said steering valve, wherein a switching valve is provided, which is actuatable between a first position in which said driving arrangement is supplied with hydraulic fluid under pressure, and a second position in which a supply of hydraulic fluid to said driving arrangement is interrupted, wherein said switching valve is hydraulically actuated into said second position by a pressure generated upon actuating of said manual steering section. ### Claim 2 (depends on 1) The hydraulic steering according to claim 1, wherein in said second position said switching valve connects a high pressure driving port (PE) of said hydraulic driving arrangement to said low pressure port. ### Claim 3 (depends on 1) The hydraulic steering according to claim 1, wherein in said second position said switching valve interrupts a connection between said steering valve and said working ports (CL, CR) when said pressure is generated. ### Claim 4 (depends on 1) The hydraulic steering according to claim 1, wherein said pressure acts on an auxiliary valve, said auxiliary valve establishes a connection between said manual steering section and said working ports (CL, CR) when said pressure is generated. ### Claim 5 (depends on 1) The hydraulic steering according to claim 1, wherein said steering valve comprises two driving ports, wherein each of said driving ports is connected to a return line via valve means opening in said second position of said switching valve. ### Claim 6 (depends on 5) The hydraulic steering according to claim 5, wherein said return line is connected to said low pressure port (T) by means of said switching valve when said pressure is generated. ### Claim 7 (depends on 6) The hydraulic steering according to claim 6, wherein said valve means comprise for each driving port a check valve opening away from said driving port towards said return line. ### Claim 8 (depends on 6) The hydraulic steering according to claim 6, wherein said return line opens into a supply line of said driving arrangement, said supply line being connected to said low pressure port in the second position of said switching valve. ### Claim 9 (depends on 1) The hydraulic steering according to claim 1, wherein said steering valve is connected to a position sensor, said position sensor being connected to control means, said control means comparing a given set-value and a position value detected by said position sensor. ### Claim 10 (depends on 1) The hydraulic steering according to claim 1, wherein said steering valve comprises means to return a steering valve element to a predetermined position range upon activation of said manual steering section. ### Claim 11 (depends on 2) The hydraulic steering according to claim 2, wherein in said second position said switching valve interrupts a connection between said steering valve and said working ports (CL, CR) when said pressure is generated. ### Claim 12 (depends on 2) The hydraulic steering according to claim 2, wherein said pressure acts on an auxiliary valve, said auxiliary valve establishes a connection between said manual steering section and said working ports (CL, CR) when said pressure is generated. ### Claim 13 (depends on 3) The hydraulic steering according to claim 3, wherein said pressure acts on an auxiliary valve, said auxiliary valve establishes a connection between said manual steering section and said working ports (CL, CR) when said pressure is generated. ### Claim 14 (depends on 2) The hydraulic steering according to claim 2, wherein said steering valve comprises two driving ports, wherein each of said driving ports is connected to a return line via valve means opening in said second position of said switching valve. ### Claim 15 (depends on 3) The hydraulic steering according to claim 3, wherein said steering valve comprises two driving ports, wherein each of said driving ports is connected to a return line via valve means opening in said second position of said switching valve. ### Claim 16 (depends on 4) The hydraulic steering according to claim 4, wherein said steering valve comprises two driving ports, wherein each of said driving ports is connected to a return line via valve means opening in said second position of said switching valve. ### Claim 17 (depends on 7) The hydraulic steering according to claim 7, wherein said return line opens into a supply line of said driving arrangement, said supply line being connected to said low pressure port in the second position of said switching valve. ### Claim 18 (depends on 2) The hydraulic steering according to claim 2, wherein said steering valve is connected to a position sensor, said position sensor being connected to control means, said control means comparing a given set-value and a position value detected by said position sensor. ### Claim 19 (depends on 3) The hydraulic steering according to claim 3, wherein said steering valve is connected to a position sensor, said position sensor being connected to control means, said control means comparing a given set-value and a position value detected by said position sensor. ### Claim 20 (depends on 4) The hydraulic steering according to claim 4, wherein said steering valve is connected to a position sensor, said position sensor being connected to control means, said control means comparing a given set-value and a position value detected by said position sensor. ### Claim 21 (depends on 1) The hydraulic steering according to claim 1, wherein the manual steering section comprises a load sensing port connected to the switching valve through an auxiliary valve, and wherein the pressure generated upon actuating of said manual steering section is generated at the load sensing port.