Load-controlled hydraulic supply for an attachment attached to an agricultural tractor
AssigneeDeere & Company
InventorManuel Billich
Life of this patent
Estimating the term…
Abstract
A load-controlled hydraulic supply for an attachment attached to an agricultural tractor includes a hydraulic high-pressure source providing a volume flow in a supply line, a return line leading to a hydraulic reservoir, and a load-indicating line connected to a device for pressure limiting. The volume flow is adjusted based on pressure feedback prevailing at the load-indicating line.
Claims15
A load-controlled hydraulic supply for an attachment attached to an agricultural tractor, comprising:
- a variable displacement pump providing a volume flow in a supply line;
- a return line leading to a hydraulic reservoir;
- and
- a load-indicating line connected to a pressure-limiting valve;
- wherein the volume flow is adjusted based on pressure feedback prevailing at the load-indicating line;
- and
- wherein the valve arrangement comprises a first 2/2-way valve which is pilot-actuated via the externally prevailing load-indicating pressure, wherein the first 2/2-way valve is connected on the inlet side to the variable displacement pump and is prestressed into its open position via an actuating force of a spring element that assists the pilot actuation.
A load-controlled hydraulic supply for an attachment attached to an agricultural tractor, comprising:
- a variable displacement pump providing a volume flow in a supply line;
- a pressure-compensated control valve for adjusting the volume flow in the supply line;
- a return line leading to a hydraulic reservoir;
- a pressure-reducing valve located in a load-indicating line;
- and
- a valve arrangement for variably increasing a load-indicating pressure prevailing externally at the load-indicating line;
- wherein the volume flow is adjusted based on pressure feedback prevailing at the load-indicating line;
- and
- wherein the valve arrangement comprises a first 2/2-way valve which is pilot-actuated via the externally prevailing load-indicating pressure, wherein the first 2/2-way valve is connected on the inlet side to the variable displacement pump and is prestressed into its open position via an actuating force of a spring element that assists the pilot actuation.
A load-controlled hydraulic supply for an attachment attached to an agricultural tractor, comprising:
- a variable displacement pump providing a volume flow in a supply line;
- a return line leading to a hydraulic reservoir;
- and
- a load-indicating line connected to a pressure-reducing valve;
- wherein the volume flow is adjusted based on pressure feedback prevailing at the load-indicating line;
- and
- wherein the valve arrangement comprises a first 2/2-way valve which is pilot-actuated via the externally prevailing load-indicating pressure, wherein the first 2/2-way valve is connected on the inlet side to the variable displacement pump and is prestressed into its open position via an actuating force of a spring element that assists the pilot actuation.
Dependencies are inferred from the claim text.