Steering system
AssigneeDanfoss Power Solutions ApS
InventorOle Falck Sørensen
Life of this patent
Estimating the term…
Abstract
A steering system (1) is described including a supply port arrangement having a supply port (P) and a return port (T), a steering command arrangement having a steering sensor (5), a controller (9) connected to the steering sensor (5), an electro-hydraulic steering valve (8) con-trolled by the controller (9), and a working port arrangement having two working ports (L, R), wherein the working port arrangement is connected to the supply port arrangement by means of the steering valve (8). Such a steering system should have a good comfort. To this end the steering command arrangement includes a steering wheel (4) connected to a hydraulic pumping unit (7), wherein the pumping unit (7) is part of a hydraulic circuit (11) having means for creating a flow resistance.
Claims19
A steering system comprising a supply port arrangement having a supply port and a return port, a steering command arrangement having a steering sensor, a controller connected to the steering sensor, an electro-hydraulic steering valve controlled by the controller, and a working port arrangement having two working ports, wherein the working port arrangement is connected to the supply port arrangement by means of the steering valve, wherein the steering command arrangement comprises a steering wheel connected to a hydraulic pumping unit, wherein the pumping unit is part of a hydraulic circuit having means for creating a flow resistance, and wherein the means for creating the flow resistance have a variable orifice.
A steering system comprising a supply port arrangement having a supply port and a return port, a steering command arrangement having a steering sensor, a controller connected to the steering sensor, an electro-hydraulic steering valve controlled by the controller, and a working port arrangement having two working ports, wherein the working port arrangement is connected to the supply port arrangement by means of the steering valve, wherein the steering command arrangement comprises a steering wheel connected to a hydraulic pumping unit, wherein the pumping unit is part of a hydraulic circuit having means for creating a flow resistance, wherein the hydraulic circuit is connected to the steering valve by means of a safety valve establishing or interrupting a hydraulic flow path between the hydraulic circuit and the steering valve, and wherein the safety valve is connected to the working port arrangement via the steering valve.
A steering system comprising a supply port arrangement having a supply port and a return port, a steering command arrangement having a steering sensor, a controller connected to the steering sensor, an electro-hydraulic steering valve controlled by the controller, and a working port arrangement having two working ports, wherein the working port arrangement is connected to the supply port arrangement by means of the steering valve, wherein the steering command arrangement comprises a steering wheel connected to a hydraulic pumping unit, wherein the pumping unit is part of a hydraulic circuit having means for creating a flow resistance, and wherein steering valve comprises safety valve ports connected to the safety valve, wherein the steering valve comprises a main fluid path arrangement for each direction of steering and a check valve arrangement, the check valve arrangement allowing a flow of hydraulic fluid from the safety valve to one of the working ports and back from the other working port to the safety valve depending on the valve position of the steering valve.
Dependencies are inferred from the claim text.