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US 2009/0255248 A1Published application
Hydraulic Arrangement
AssigneeDeere & Company
InventorMarcus Bitter
Life of this patent
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AssigneeDeere & Company
InventorMarcus Bitter
Estimating the term…
A hydraulic arrangement for regulating a lifting mechanism (12) of an agricultural machine (10) is described. The hydraulic arrangement (16) comprises a hydraulic cylinder (24) having a chamber (50) capable of being acted upon by pressure, a proportionally adjustable inflow valve (22) which is connected on the outlet side via an inflow line (30) to the chamber (50) and which is connected on the inlet side to a hydraulic pump (18, 18′), a first outlet line (32) which makes a connection between the chamber (50) and a hydraulic tank (20), adjustment means (42, 44) for generating an adjustment signal for the hydraulic cylinder (24), and an electronic control unit (40). In order to provide a space-saving regulating system which is simple in structural terms, it is proposed that an electroproportional pressure relief valve (26) be arranged in the first outflow line (32) and a non-return valve (28) closing in the direction of the inflow valve (22) be arranged in the inflow line (30), and also one or more sensors (36, 38) connected to the hydraulic cylinder (24) and generating a sensor signal be provided, the pressure relief valve (26) being controllable or regulatable as a function of the one or more sensor signals and/or of the adjustment signal.
Hydraulic arrangement for regulating a lifting mechanism (12) of an agricultural machine (10), with at least one first hydraulic cylinder (24) having a chamber (50) capable of being acted upon by pressure, with at least one proportionally adjustable inflow valve (22) which is connected on the outlet side via a first inflow line (30) to the chamber (50) and which is connected on the inlet side to a hydraulic pump (18, 18′), with at least one first outflow line (32) which makes a connection between the chamber (50) and a hydraulic tank (20), with adjustment means (42, 44) for generating an adjustment signal for the hydraulic cylinder (24), and with an electronic control unit (40), characterized in that a first electroproportional pressure relief valve (26) is arranged in the first outflow line (32) and a first non-return valve (28) closing in the direction of the inflow valve (22) is arranged in the first inflow line (30), and also one or more sensors (36, 38) related to the at least first hydraulic cylinder (24) and generating a sensor signal are provided, the at least first pressure relief valve (26) being controllable or regulatable as a function of the one or more sensor signals and/or of the adjustment signal.
Hydraulic arrangement according to one of the preceding claims, characterized in that further sensors (72) are provided, preferably contact sensors which detect with respect to the ground surface a position of an attachment (14) or mounted implement fastened to a lifting mechanism (12) of an agricultural machine (10) and which are connected to the electronic control unit (40).
Dependencies are inferred from the claim text.