Logic valve for the management of a hydraulic actuator and corresponding hydraulic circuit

Patent metadata

Field	Value
Publication number	US-11215203-B2
Application number	US-202016863842-A
Country	US
Kind code	B2
Filing date	Apr 30, 2020
Priority date	May 3, 2019
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

A logic valve for management of a hydraulic actuator comprising: a valve body with a hollow seat which extends along a work direction and communicates with a first port adapted for receiving a pressurized working fluid, a second port adapted for fluidly coupling with an operating chamber of the hydraulic actuator, and a third port adapted for discharging the working fluid; a slider within the hollow seat movable along the work direction; and a spring between the valve body and the slider and oriented to act on the slider along the work direction in the direction away from said third port, wherein the slider is movable between a first operating configuration fluidly coupling the second and third ports and excluding fluid communication between them and the first port, and a second operating configuration fluidly coupling the first and second ports and excluding fluid communication between them and the third port.

First claim

The invention claimed is:

1. A logic valve for management of a hydraulic actuator comprising:
a valve body provided internally with a hollow seat which is extended along a work direction and communicates with a first port adapted to be placed in fluid communication with a pressurized working fluid, a second port adapted to be placed in fluid communication with an operating chamber of the hydraulic actuator, and a third port adapted for discharging the working fluid;
a slider accommodated within said hollow seat which can move with an alternating sliding motion along said work direction; and
a spring interposed between said valve body and said slider and oriented to act on said slider along said work direction in a direction away from said third port,
wherein said slider can move alternately between a first operating configuration fluidly coupling said second and third ports and excluding fluid communication between them and said first port, and a second operating configuration fluidly coupling said first and second ports and excluding fluid communication between them and said third port, and wherein said slider has a first circular active surface which faces said first port, a third circular active surface which faces said third port, and a second annular active surface which is interposed between the first and third active surfaces and faces said second or third port, the sum of the extensions of the second and third surfaces being substantially equal to the extension of the first surface, in the first operating configuration the second surface being arranged between the first and second ports along the work direction, and in the second operating configuration the second surface being arranged between the second and third ports along said work direction.

2. The valve according to claim 1 , wherein in a transition between said first and second operating configurations said slider is adapted to assume a transient configuration in which said first, second and third ports are mutually isolated.

3. The valve according to claim 1 , wherein said first and third ports are in fluid communication with said hollow seat at mutually opposite ends along said work direction and said second port is in fluid communication with said hollow seat in a position that is intermediate between the first and third ports.

4. The valve according to claim 1 , wherein said slider has a continuous external surface adapted so as not to be crossed by the working fluid.

5. The valve according to claim 1 , wherein said first port is in fluid communication with said hollow seat proximate to and at a first end along said work direction, said second port is in fluid communication with a second end of said hollow seat along said work direction arranged opposite the first end, and said third port is in fluid communication with said hollow seat in a position that is intermediate between the first end and the second end, the slider being provided with at least one internal through channel for establishing communication of the first and second ports in the second operating configuration and of the second and third ports in the first operating configuration.

6. The valve according to claim 5 , wherein the first circular surface and the second circular surface having substantially mutually identical extensions, and the first annular surface and the third annular surface having substantially mutually identical extensions.

7. The valve according to claim 1 , wherein it comprises a maximum pressure valve assembly associated with said first port.

8. A hydraulic management circuit, comprising:
a hydraulic actuator which has at least one operating chamber;
a supply element configured to supply a pressurized working fluid;
a drain configured to discharge said working fluid; and
at least one logic valve according to claim 1 , having said first port in fluid communication with a first operating line for connection with said supply element, said second port in fluid communication with a second operating line for connection with said operating chamber, and said third port in fluid communication with a third operating line for connection with said drain.

9. The circuit according to claim 8 , wherein said hydraulic actuator is of the double-acting type and comprises two of said operating chambers and two of said logic valves, each of which has the first port in fluid communication with said supply element by means of a respective first operating line for connection, the second port in fluid communication with a respective operating chamber by means of a corresponding second operating line for connection, and the third port in fluid communication with said drain by means of a respective third operating line for connection.

10. The circuit according to claim 8 , wherein said hydraulic actuator is of the linear type.

11. The circuit according to claim 8 , wherein said actuator is of the rotary type.

12. The circuit according to claim 9 , wherein said hydraulic actuator is of the linear type.

13. The circuit according to claim 9 , wherein said actuator is of the rotary type.

14. The valve according to claim 2 , wherein said first and third ports are in fluid communication with said hollow seat at mutually opposite ends along said work direction and said second port is in fluid communication with said hollow seat in a position that is intermediate between the first and third ports.

15. The valve according to claim 2 , wherein said first port is in fluid communication with said hollow seat proximate to and at a first end along said work direction, said second port is in fluid communication with a second end of said hollow seat along said work direction arranged opposite the first end, and said third port is in fluid communication with said hollow seat in a position that is intermediate between the first end and the second end, the slider being provided with at least one internal through channel for establishing communication of the first and second ports in the second operating configuration and of the second and third ports in the first operating configuration.

16. The valve according to claim 3 , wherein said slider has a continuous external surface adapted so as not to be crossed by the working fluid.

17. The valve according to claim 2 , wherein said slider has a continuous external surface adapted so as not to be crossed by the working fluid.

18. The valve according to claim 4 , wherein said slider has a first circular active surface which faces said first port, a third circular active surface which faces said third port, and a second annular active surface which is interposed between the first and third active surfaces and faces said second and/or third port, the sum of the extensions of the second and third surfaces being substantially equal to the extension of the first surface, in the first operating configuration the second surface being arranged between the first and second ports along the work direction, and in the second operating configuration the second surface being arranged between the second and third ports along said work direction.

19. The valve according to claim 3 , wherein said slider has a first circular active surface which faces said first port, a third circular active surface which faces said third port, and a second annular active surface which is interposed between the first and third active surfaces and faces said second and/or third port, the sum of the extensions of the second and third surfaces being substantially equal to the extension of the first surface, in the first opera

Assignees

• Dana Motion Sys Italia Srl

Inventors

• Trinchieri Piergiorgio

Classifications

• F15B13/0405

  for seat valves, i.e. poppet valves · CPC title

• F15B2211/7052

  Single-acting output members · CPC title

• F15B13/042 Primary

  operated by fluid pressure {(F15B13/0401, F15B13/0416 take precedence)} · CPC title

• F15B2211/31576

  having a single pressure source and a single output member · CPC title

• F15B13/0402 Primary

  for linearly sliding valves, e.g. spool valves · CPC title