US 12,448,989 B2
Auxiliary hydraulic system for a work vehicle
Jeffrey L. Lubben, Hudson, IA (US); Craig A. Puetz, Waterloo, IA (US); and Nathanael K. Rehn, Waterloo, IA (US)
Assigned to DEERE & COMPANY, Moline, IL (US)
Filed by DEERE & COMPANY, Moline, IL (US)
Filed on Feb. 21, 2022, as Appl. No. 17/651,884.
Prior Publication US 2023/0265864 A1, Aug. 24, 2023
Int. Cl. F15B 1/04 (2006.01); B60D 1/62 (2006.01); B60T 13/14 (2006.01); B62D 5/30 (2006.01); F15B 13/02 (2006.01)
CPC F15B 1/04 (2013.01) [B60D 1/62 (2013.01); B60T 13/14 (2013.01); B62D 5/30 (2013.01); F15B 13/024 (2013.01); B60T 2270/402 (2013.01); F15B 2201/51 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An auxiliary hydraulic system, comprising:
an accumulator connected to a primary hydraulic system including a hydraulic pump, a brake circuit, and a steering circuit;
a control valve selectively allowing or preventing flow from the accumulator to the brake circuit and the steering circuit;
a first selective control valve (SCV) port selectively connecting an external source to the accumulator and the control valve;
a second selective control valve (SCV) port selectively connecting the external source to the accumulator and the control valve;
a pressure relief valve positioned between the accumulator and the second selective control valve (SCV) port, the pressure relief valve relieving the pressure to the second selective control valve (SCV) port, and the pressure relief valve limiting the pressure in the auxiliary hydraulic system and preventing the accumulator from an overcharge condition;
a first pressure sensor detecting a first pressure in the auxiliary hydraulic system;
a second pressure sensor detecting a second pressure in the accumulator;
a flow restrictor positioned between the hydraulic pump and the accumulator;
a first check valve allowing flow from the hydraulic pump through the flow restrictor to the accumulator by bypassing the control valve, the first check valve preventing flow from the accumulator to the flow restrictor; and
a second check valve allowing flow from the accumulator to the primary hydraulic system and preventing flow from the hydraulic pump to the control valve.