HYDRAULIC VALVE WITH A FILTER AND CHECK VALVE BAND

• US 20100243085A1
• Filed: 03/25/2009
• Published: 09/30/2010
• Est. Priority Date: 03/25/2009
• Status: Active Grant

• Current Assignee: Husco Automotive Holdings LLC (Husco International Incorporated)
• Original Assignee: Husco Automotive Holdings LLC (Husco International Incorporated)
• Inventors: Flynn, Edward A., Van Weelden, Curtis L.
• Granted Patent: US 8,127,790 B2
• Time in Patent Office: Days
• US Class Current: 137/544
• CPC Class Codes: F15B 13/0402 for linearly sliding valves, e.g. spool valves
• CPC Class Codes: F15B 21/041 Removal or measurement of solid or liquid contamination, e.g. filtering
• CPC Class Codes: F16K 11/0716 with fluid passages through the valve member F16K11/0704, F16K11/0708, F16K11/0712 take precedence
• CPC Class Codes: F16K 15/145 the closure elements being shaped as a solids of revolution, e.g. cylindrical or conical
• CPC Class Codes: F16K 31/0613 with cylindrical slides
• CPC Class Codes: Y10T 137/794 With means for separating solid material from the fluid
• CPC Class Codes: Y10T 137/8122 Planar strainer normal to flow path
• CPC Class Codes: Y10T 137/86622 Motor-operated
• CPC Class Codes: Y10T 137/86879 Reciprocating valve unit

Abstract

An hydraulic valve has a body with an exterior surface, a longitudinal bore, and first and second fluid ports in communication with the bore wherein the first fluid port opens through the exterior surface. A band is wrapped in first and second layers around the exterior surface which layers extend over the opening of the first fluid port. The first layer has a plurality of apertures there through and overlaying the opening to provide a filter. The second layer has a flap that flexes in response to pressure to open and close the plurality of apertures thereby acting as a check valve. An actuator slides a spool within the bore thereby selectively connecting and disconnecting the first and second fluid ports.

Claims

1. An hydraulic valve comprising:

a valve body with an exterior surface and a first fluid port and a second fluid port, wherein the first fluid port has an opening in the exterior surface; and

a band wrapped around the exterior surface forming a first layer and a second layer of the band extending over the opening of the first fluid port, wherein the first layer has at least one aperture there through and overlaying the opening and the second layer has a flap that in response to pressure flexes to open and close every aperture.

2. The hydraulic valve as recited in claim 1 wherein the first layer is proximate to the valve body and the second layer is on a remote side of the first layer from the valve body.

3. The hydraulic valve as recited in claim 1 wherein the second layer is proximate to the valve body and the first layer is on a remote side of the second layer from the valve body.

4. The hydraulic valve as recited in claim 1 wherein the flap is formed by a U-shaped slot extending through the band.

5. The hydraulic valve as recited in claim 1 wherein the flap flexes along a line transverse to a longitudinal axis of the band.

6. The hydraulic valve as recited in claim 1 wherein the band further comprises a first section which a tab is formed, and a second section that has an aperture into which the tab extends to secure the first and second sections together.

7. The hydraulic valve as recited in claim 6 wherein the tab extends through the aperture and is bent against an exterior surface of the second section.

8. The hydraulic valve as recited in claim 1 wherein the band is received in a recess that extends around the valve body.

9. The hydraulic valve as recited in claim 1 wherein the band has an element that engages a feature on the valve body to prevent the band from rotating around the valve body.

10. The hydraulic valve as recited in claim 1 wherein first layer has a plurality of apertures there through, overlaying the opening and forming a filter for fluid flowing through the opening, wherein flexing of the flap opens and closes the plurality of apertures.

11. The hydraulic valve as recited in claim 1 further comprising:

a spool slideable into different positions within a bore in the valve body, thereby selectively opening and closing a fluid path between the first and second fluid ports; and

an actuator operably coupled to move the spool into the different positions within the bore.

12. The hydraulic valve as recited in claim 11 wherein the actuator comprises a solenoid coil, an armature slideably received in the solenoid coil, and a push member projecting from the armature into engagement with the spool.

13. An hydraulic valve comprising:

a valve body with a cylindrical exterior surface and a longitudinal bore, the valve body having a plurality of first fluid ports and a second fluid port both in communication with the bore, wherein each first fluid port opens through the cylindrical exterior surface;

a band wrapped around the cylindrical exterior surface thereby forming first and second layers of the band extending over the plurality of first fluid ports, wherein the first layer has a plurality of groups of multiple apertures there through with each group overlaying one of the first fluid ports, and wherein the second layer has a plurality of flaps, each of which overlaying one of the first fluid ports and flexing in response to pressure to open and close one group of multiple apertures;

a valve element slideable into different positions within the bore of the valve body thereby selectively connecting and disconnecting the second fluid port with the plurality of first fluid ports; and

an actuator operably coupled to move the valve element into different positions within the bore.

14. The hydraulic valve as recited in claim 13 wherein the first layer is proximate to the valve body and the second layer is on a remote side of the first layer from the valve body.

15. The hydraulic valve as recited in claim 13 wherein the second layer is proximate to the valve body and the first layer is on a remote side of the second layer from the valve body.

16. The hydraulic valve as recited in claim 13 wherein the flap is formed by a U-shaped slot extending through the band.

17. The hydraulic valve as recited in claim 13 wherein the flap flexes along a line that is parallel to a longitudinal axis of the longitudinal bore.

18. The hydraulic valve as recited in claim 13 wherein the band further comprises a first section which a tab is formed, and a section which has an aperture into which the tab extends to secure the first and second end sections together.

19. The hydraulic valve as recited in claim 18 wherein the tab extends through the aperture and is bent against a surface of the second end section.

20. The hydraulic valve as recited in claim 13 wherein the valve body has an annular exterior recess and the band located in the annular exterior recess.

21. The hydraulic valve as recited in claim 13 wherein the band has an element that engages a feature on the valve body to prevent the band from sliding around the valve body.

22. The hydraulic valve as recited in claim 13 wherein the band has a length dimension that extends circumferentially around the valve body, and the plurality of flaps flex about lines that are transverse to the length dimension of the band.