SPOOL VALVE HAVING A CHANNEL

• US 20180180193A1
• Filed: 12/22/2017
• Published: 06/28/2018
• Est. Priority Date: 12/23/2016
• Status: Active Grant

• Current Assignee: SVM Schultz Verwaltungs-GmbH & Co. KG
• Original Assignee: SVM Schultz Verwaltungs-GmbH & Co. KG
• Inventors: Mang, Helmut, Schreiber, Florian
• Granted Patent: US 10,767,781 B2
• Time in Patent Office: Days
• CPC Class Codes: F16H 2061/0253 Details of electro hydraulic valves, e.g. lands, ports, spools or springs
• CPC Class Codes: F16H 61/0251 Elements specially adapted for electric control units, e.g. valves for converting electrical signals to fluid signals
• CPC Class Codes: F16K 11/07 with cylindrical slides
• CPC Class Codes: F16K 27/041 cylindrical slide valves
• CPC Class Codes: F16K 31/0613 with cylindrical slides

Abstract

A spool valve, in particular for an automatic transmission of a motor vehicle, having a valve housing, which houses a guide element, in which an axially movable valve spool is arranged, and the valve housing having at least one radial pressure connection and a radial tank connection being axially distanced therefrom, and a frontal working connection, wherein on the guide element at least one pressure connection opening connected to the pressure connection and one tank connection opening, axially distanced therefrom and connected to the tank connection and one working connection, which is axially positioned between the pressure connection opening and the tank connection opening and is connected to the working connection are provided, and wherein in the valve housing a partially axially extending connection duct is present, which connects the working connection opening to the working connection.

Claims

1. A spool valve, comprising:

a valve housing, which houses a guide element, in which an axially movable valve spool is arranged, and the valve housing having at least one radial pressure connection and a radial tank connection being axially distanced therefrom, and a working connection, wherein on the guide element at least one pressure connection opening connected to the pressure connection and one tank connection opening, axially distanced therefrom and connected to the tank connection and one working connection, which is axially positioned between the pressure connection opening and the tank connection opening and is connected to the working connection are provided, and wherein in the valve housing a partially axially extending connection channel is present, which connects the working connection opening to the working connection, and wherein the channel is delimited radially inwards by the outer wall of the guide element and radially outwards by an inner wall of the valve housing.

2. The spool valve of claim 1, wherein the guide element comprises a spool sleeve which is made of metal, in which the pressure connection opening, the tank connection opening and the working connection opening are formed.

3. The spool valve of claim 1, wherein the channel is delimited, at the height of the pressure connection opening, radially inwards by the outer wall of the guide element and radially outwards by an inner wall of the valve housing.

4. The spool valve of claim 1, wherein the guide element is a component which is separate from the valve housing.

5. The spool valve of claim 1, wherein the outer wall of the guide element comprise metal.

6. The spool valve of claim 1, wherein the valve housing, and an inner wall comprise plastic.

7. The spool valve of claim 1, wherein the valve housing is provided, at its axial end, with a filter cage, and wherein the working connection opens and the filter cage has a first passage opening for the working connection.

8. The spool valve of claim 7, wherein the filter cage has a radially positioned second passage opening for the pressure connection.

9. The spool valve of claim 7, wherein the end of the guide element which is facing the filter cage is freed from the plastic material of the valve housing, and wherein the end supports an abutment cap, against which the return spring acting on the valve spool abuts.

10. The spool valve of claim 1, wherein the valve spool is provided with a flow channel, which is delimited by the first and second control edge.

11. The spool valve of claim 1, wherein the channel comprises at least one axial partial channel, which, with respect to the pressure connection and/or the tank connection, is offset by 90°

in the circumferential direction.

12. The spool valve of claim 11, wherein the axial partial channel at least partially defines a cross-section which has approximately the shape of a circular segment or a crescent.

13. The spool valve of claim 1, further comprising an electromagnetic unit, having and armature that acts on the valve spool, against the force provided by the return spring.

14. The spool valve of claim 1, wherein the guide element has a flattening or cavity, and the flattening or cavity are part of the channel or of the at least one of axial partial channels.

15. The spool valve of claim 1, wherein the axial channel directly opens into the frontal working connection.

16. The spool valve of claim 1, further comprising a radial pressure connection on the valve housing.

17. The spool valve of claim 1, further comprising a radial tank connection on the valve housing.

18. The spool valve of claim 1, further comprising a frontal working connection on the valve housing.

19. The spool value of claim 1 wherein the valve is constructed and arranged to mount in an automatic transmission of a motor vehicle.

20. The spool valve of claim 6 wherein the valve housing, and the inner wall thereof, are made of an injection molded plastic material, which surrounds the guide element.