Hydraulic system and vehicle

Patent metadata

Field	Value
Publication number	US-11359649-B2
Application number	US-202016835775-A
Country	US
Kind code	B2
Filing date	Mar 31, 2020
Priority date	Apr 10, 2019
Publication date	Jun 14, 2022
Grant date	Jun 14, 2022

Abstract

A hydraulic system of a vehicle includes a first pump for supplying at least one first hydraulic circuit and at least one second pump for supplying at least one second hydraulic circuit with hydraulic medium. The second pump supplies the first hydraulic circuit with hydraulic medium in an emergency mode or when an output pressure of the first pump fails.

First claim

The invention claimed is:

1. A hydraulic system of a vehicle, comprising:
a first pump for supplying at least one first hydraulic circuit; and
at least one second pump for supplying at least one second hydraulic circuit with hydraulic medium;
wherein the second pump supplies the first hydraulic circuit with hydraulic medium in an emergency mode;
wherein the second pump is driven by a main drive or an emergency drive; and
wherein the second pump is operatively connected to the main drive and to the emergency drive via a transmission.

2. The hydraulic system of claim 1 , wherein the first hydraulic circuit supplies a steering or braking system of the vehicle with hydraulic medium.

3. The hydraulic system of claim 1 , wherein the second hydraulic circuit supplies at least one functional assembly of the vehicle with hydraulic medium.

4. The hydraulic system of claim 1 , wherein the second pump supplies only the first hydraulic circuit or the second hydraulic circuit with hydraulic medium in the emergency mode.

5. The hydraulic system of claim 1 , wherein at least one of the pumps is designed as a pump with a variable delivery volume, wherein the delivery volume is controllable in accordance with an applied load pressure.

6. The hydraulic system of claim 1 , further comprising at least one changeover valve which is operably switched based on a pump output pressure.

7. The hydraulic system of claim 1 , wherein the emergency mode includes one or more of the following: a failure of the first pump, a failure of the main drive, a failure of the output pressure of the first pump, and no pressure in a control line.

8. The hydraulic system of claim 7 , wherein the main drive or the emergency drive is assigned a clutch.

9. The hydraulic system of claim 8 , wherein the clutch comprises a freewheel clutch or a hydraulic clutch.

10. The hydraulic system of claim 1 , wherein the first pump is operatively connected to the main drive and the emergency drive via a transmission.

11. The hydraulic system of claim 1 , further comprising a priority valve for directing excess hydraulic medium out of the first hydraulic circuit into the second hydraulic circuit in the emergency mode based on a pressure difference between the first hydraulic circuit and the second hydraulic circuit.

12. The hydraulic system of claim 1 , wherein a higher load pressure between the first hydraulic circuit and the second hydraulic circuit is signalled to the second pump by a changeover valve.

13. The hydraulic system of claim 12 , wherein the changeover valve comprises an integrated shuttle valve.

14. A vehicle, comprising:
a chassis;
a plurality of wheels for supporting the chassis;
a steering system and a braking system being actuated to control the vehicle;
a hydraulic system comprising:
a first pump for supplying at least one first hydraulic circuit;
a second pump for supplying at least one second hydraulic circuit with hydraulic medium;
wherein the second pump supplies the first hydraulic circuit with hydraulic medium in an emergency mode;
wherein the first hydraulic circuit supplies the steering or braking system of the vehicle with hydraulic medium; and
wherein the second pump is operatively connected to the main drive and the emergency drive via a transmission.

15. The vehicle of claim 14 , wherein the second pump supplies only the first hydraulic circuit or the second hydraulic circuit with hydraulic medium in the emergency mode.

16. The vehicle of claim 14 , further comprising at least one changeover valve which is operably switched based on a pump output pressure.

17. The vehicle of claim 14 , wherein the second pump is driven by a main drive or an emergency drive.

18. The vehicle of claim 17 , wherein the first pump is operatively connected to the main drive and the emergency drive via a transmission.

19. A hydraulic system of a vehicle, comprising:
a first pump for supplying at least one first hydraulic circuit;
at least one second pump for supplying at least one second hydraulic circuit with hydraulic medium;
a priority valve for directing excess hydraulic medium out of the first hydraulic circuit into the second hydraulic circuit in the emergency mode based on a pressure difference between the first hydraulic circuit and the second hydraulic circuit; and
a changeover valve including an integrated shuttle valve;
wherein the second pump supplies the first hydraulic circuit with hydraulic medium in an emergency mode;
wherein the changeover valve signals a higher load pressure between the first hydraulic circuit and the second hydraulic circuit to the second pump.

20. A hydraulic system of a vehicle, comprising:
a first pump for supplying at least one first hydraulic circuit;
at least one second pump for supplying at least one second hydraulic circuit with hydraulic medium; and
a priority valve for directing excess hydraulic medium out of the first hydraulic circuit into the second hydraulic circuit in the emergency mode based on a pressure difference between the first hydraulic circuit and the second hydraulic circuit;
wherein the second pump supplies the first hydraulic circuit with hydraulic medium in an emergency mode.

Assignees

• Deere & Co

Inventors

• Meid Michael
• Brueser Christian

Classifications

• F15B2211/8633

  Pressure source supply failure · CPC title

• F15B2211/20546

  variable capacity · CPC title

• F15B20/004 Primary

  Fluid pressure supply failure · CPC title

• B62D5/30

  Safety devices, e.g. alternate emergency power supply or transmission means to ensure steering upon failure of the primary steering means · CPC title

• F15B2211/20576

  with multiple pumps · CPC title