Hydraulic circuitry for skid steer loader valve

Patent metadata

Field	Value
Publication number	US-10024443-B2
Application number	US-201615176796-A
Country	US
Kind code	B2
Filing date	Jun 8, 2016
Priority date	Jun 9, 2015
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

Arrangements of a flow path to achieve a series circuit, a regeneration circuit and a float/passive regeneration circuit. For example, a valve body having a spool bore, a valve inlet, a plurality of cavities opening into the spool bore and a spool disposed in the spool bore. A first cavity fluidly connected to a tank passage, a second cavity fluidly connected to a first work port, a third cavity fluidly connected to an inlet of another valve, a fourth cavity fluidly connected to a second work port, a fifth cavity fluidly connected to the valve inlet, a sixth cavity fluidly connected to the first work port, a seventh cavity, an eighth cavity fluidly connected to the valve inlet, a ninth cavity fluidly connected to the inlet of the other valve and a tenth cavity fluidly connected to the valve inlet.

First claim

What is claimed is:

1. A hydraulic valve assembly comprising:
a valve body having a spool bore, a valve inlet, and a plurality of cavities opening into the spool bore; and
a spool disposed in the spool bore,
wherein the plurality of cavities includes:
a first cavity fluidly connected to a tank passage;
a second cavity adjacent the first cavity and fluidly connected to a first work port;
a third cavity adjacent the second cavity and fluidly connected to an inlet of another valve;
a fourth cavity adjacent the third cavity and fluidly connected to a second work port;
a fifth cavity adjacent the fourth cavity and fluidly connected to the valve inlet regardless of the spool's position;
a sixth cavity adjacent the fifth cavity and fluidly connected to the first work port regardless of the spool's position;
a seventh cavity adjacent the sixth cavity;
an eighth cavity adjacent the seventh cavity and fluidly connected to the valve inlet regardless of the spool's position;
a ninth cavity adjacent the eighth cavity and fluidly connected to the inlet of the other valve; and
a tenth cavity adjacent the ninth cavity and fluidly connected to the valve inlet.

2. The hydraulic valve assembly of claim 1 , wherein the fifth cavity is fluidly connected to the valve inlet via a check valve, the check valve allowing fluid flow from the valve inlet to the fifth cavity and preventing fluid flow from the fifth cavity to the valve inlet.

3. The hydraulic valve assembly of claim 1 , wherein the third cavity is fluidly connected to the inlet of the other valve via a check valve, the check valve preventing fluid flow from the inlet of the other valve to the third cavity and allowing fluid flow from the third cavity to the inlet of the other valve.

4. The hydraulic valve assembly of claim 1 , wherein the seventh cavity is fluidly connected to the inlet of the other valve.

5. The hydraulic valve assembly of claim 4 , wherein the seventh cavity is fluidly connected to the third cavity.

6. The hydraulic valve assembly of claim 4 , wherein the seventh cavity is fluidly connected to the inlet of the other valve via a check valve, the check valve allowing flow from the seventh cavity to the inlet of the other valve and preventing flow from the inlet of the other valve to the seventh cavity.

7. The hydraulic valve assembly of claim 1 , wherein the inlet is connected to a dedicated drain line via a pressure relief valve.

8. The hydraulic valve assembly of claim 1 , wherein the seventh cavity is fluidly connected to the valve inlet.

9. The hydraulic valve assembly of claim 8 , wherein the seventh cavity is fluidly connected to the fifth cavity.

10. The hydraulic valve assembly of claim 8 , wherein the seventh cavity is fluidly connected to the valve inlet via a check valve, the check valve allowing fluid flow from the valve inlet to the seventh cavity and preventing flow from the seventh cavity to the valve inlet.

11. The hydraulic valve assembly of claim 1 , wherein the fourth cavity is fluidly connected to the tank passage via a pressure relief valve, and the second cavity is fluidly connected to the tank passage via a pressure relief valve.

12. The hydraulic valve assembly of claim 1 , wherein the spool includes a flow path from the eighth cavity to the ninth cavity when the spool is in a neutral position, thereby fluidly connecting the valve inlet to the inlet of the other valve.

13. The hydraulic valve assembly of claim 1 , wherein the spool includes a flow path from the tenth cavity to the ninth cavity when the spool is in a neutral position, thereby fluidly connecting the valve inlet to the inlet of the other valve.

14. The hydraulic valve assembly of claim 1 , wherein the spool includes a flow path from the fifth cavity to the sixth cavity when the spool is in a first position displaced from neutral in a first direction, thereby fluidly connecting the valve inlet to the first work port.

15. The hydraulic valve assembly of claim 1 , wherein the spool includes a flow path from the third cavity to the fourth cavity when the spool is in a first position displaced from neutral in a first direction thereby fluidly connecting the second work port to the inlet of the other valve.

16. The hydraulic valve assembly of claim 1 , wherein the spool includes a flow path from the fourth cavity to the fifth cavity when the spool is in a second position displaced from neutral in a second direction, thereby fluidly connecting the valve inlet to the second work port.

17. The hydraulic valve assembly of claim 1 , wherein the spool includes a flow path from the sixth cavity to the seventh cavity when the spool is in a second position displaced from neutral in a second direction, thereby fluidly connecting the first work port to the inlet of the other valve.

18. The hydraulic valve assembly of claim 1 , wherein the spool includes a flow path from the first cavity to the second cavity when the spool is in a third position displaced from neutral in the second direction, thereby fluidly connecting the first work port to the tank passage.

19. The hydraulic valve assembly of claim 1 , wherein the spool includes a flow path from the first cavity to the fourth cavity when the spool is in a third position displaced from neutral in the second direction, thereby fluidly connecting the second work port to the tank passage.

20. The hydraulic valve assembly of claim 1 , wherein the spool includes a flow path from the second cavity to the fourth cavity when the spool is in a third position displaced from neutral in the second direction, thereby fluidly connecting the first work port to the second work port.

21. The hydraulic valve assembly of claim 1 , wherein the spool includes a flow path from the second cavity to the third cavity when the spool is in a second position displaced from neutral in a second direction thereby fluidly connecting the first work port to the inlet of the other valve.

22. The hydraulic valve assembly of claim 1 , wherein the spool includes a flow path from the seventh cavity to the sixth cavity when the spool is in a second position displaced from neutral in a second direction, thereby fluidly connecting the first work port to the second work port to provide extra flow to the second work port beyond that supplied via the valve inlet by a pump.

23. The hydraulic valve assembly of claim 1 , further comprising:
a second spool,
wherein the valve body further comprises a second spool bore that the second spool is disposed in, a second valve inlet, and a second plurality of cavities opening into the second spool bore, and
wherein the second plurality of cavities includes:
a second first cavity fluidly connected to the tank passage;
a second second cavity adjacent the second first cavity and fluidly connected to the first work port;
a second third cavity adjacent the second second cavity and fluidly connected to an inlet of a second other valve;
a second fourth cavity adjacent the second third cavity and fluidly connected to the second work port;
a second fifth cavity adjacent the second fourth cavity and fluidly connected to the second valve inlet regardless of the second spool's position;
a second sixth cavity adjacent the second fifth cavity and fluidly connected to the first work port regardless of the second spool's position;
a second seventh cavity adjacent the second sixth cavity, wherein the second seventh cavity is fluidly connected to the second valve inlet;
a second eight

Assignees

• Parker Hannifin Corp

Inventors

• Sensabaugh Chuck
• Reynolds Dennis
• Slattery Brian

Classifications

• Y10T137/87185

  Controlled by supply or exhaust valve · CPC title

• F15B13/021

  Valves for interconnecting the fluid chambers of an actuator · CPC title

• Y10T137/8671

  With annular passage [e.g., spool] · CPC title

• E02F3/3414 Primary

  the arms being pivoted at the rear of the vehicle chassis, e.g. skid steer loader · CPC title

• F15B2013/0412

  with three positions · CPC title