US 12,352,292 B2
Load-controlled hydraulic supply for an attachment attached to an agricultural tractor
Manuel Billich, Dischingen (DE)
Assigned to DEERE & COMPANY, Moline, IL (US)
Filed by DEERE & COMPANY, Moline, IL (US)
Filed on Jul. 7, 2023, as Appl. No. 18/348,618.
Claims priority of application No. 102022117880.3 (DE), filed on Jul. 18, 2022.
Prior Publication US 2024/0018979 A1, Jan. 18, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. F15B 13/02 (2006.01); A01B 63/00 (2006.01); F15B 1/26 (2006.01)
CPC F15B 1/265 (2013.01) [A01B 63/00 (2013.01); F15B 13/025 (2013.01); F15B 2211/522 (2013.01)] 15 Claims
OG exemplary drawing
 
1. 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.