Hydraulic steering system
AssigneeSauer-Danfoss (Nordborg) A/S
InventorsPoul Henning Holm Pedersen, Jorgen Clausen, Bjarne Schmidt
Life of this patent
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Abstract
A hydraulic steering system (1) with a supply connection arrangement, having a high-pressure connection (P) and a low-pressure connection (T), and with a working connection arrangement (L, R), a directional valve (2) and a metering pump unit (3, 4) being arranged between the supply connection arrangement and the working connection arrangement, the metering pump arrangement having at least two hydraulically parallel-connected and mechanically parallel-operated metering pumps (3, 4) with a shut-off valve (6) in a hydraulic connection between the two metering pumps (3, 4), said shut-off valve (6) having a return spring (16) and a first control inlet (15) that is connected with the high-pressure connection (P).
Claims15
A hydraulic steering system with a supply connection arrangement, having a high-pressure connection and a low-pressure connection, and with a working connection arrangement, a directional valve and a metering pump unit being arranged between the supply connection arrangement and the working connection arrangement, the metering pump arrangement having at least two hydraulically parallel-connected and mechanically parallel-operated metering pumps with a shut-off valve in a hydraulic connection between the two metering pumps, said shut-off valve having a return spring and a first control inlet that is connected with the high-pressure connection, characterized in that the shut-off valve (6) has a second steering inlet (17), which can be acted upon by a pressure from a lowest-pressure connection (T0).
Dependencies are inferred from the claim text.