Valve, in particular a slide valve

Abstract

The invention relates to a valve, in particular a slide valve, which has a housing and a valve housing, wherein the housing accommodates an electromagnet and the valve housing accommodates a valve part, and the housing, facing the valve housing, has a magnetic core and the magnetic core in the electromagnet forms an armature compartment base which delimits the armature compartment and against which the armature movably mounted in the armature compartment bears in a first position of the electromagnet, and the magnetic core has a penetrating opening in the region of the armature compartment to accommodate an armature bar operatively connected to the armature and the valve housing accommodates a sliding sleeve which extends along a longitudinal axis.

Claims

1. A valve, in particular a slide valve, comprising a housing which accommodates an electromagnet and a valve housing which accommodates a valve part and the housing, facing the valve housing, has a magnetic core and the magnetic core in the electromagnet forms an armature compartment base which delimits the armature compartment and against which the armature movably mounted in the armature compartment bears in a first position of the electromagnet and the magnetic core has a penetrating bore in the region of the armature compartment to accommodate an armature bar operatively connected to the armature and the valve housing accommodates a sliding sleeve which extends along a longitudinal axis, wherein the housing has at least one support surface, against which the sliding sleeve bears, and the penetrating bore opens into the bearing surface and a control piston movable against the force of a restoring spring is arranged in the sliding sleeve, is operatively connected to the armature bar and bears against the bearing surface in a second position of the electromagnet.

2. The valve according to claim 1, characterized in that the magnetic core is formed in one piece.

3. The valve according to claim 1, characterized in that the magnetic core is machined from one single blank.

4. The valve according to claim 1, characterized in that the bearing surface is formed directly on the magnetic core.

5. The valve according to claim 1, characterized in that no spring and/or no distance piece is arranged between the control piston and the bearing surface.

6. The valve according to claim 1, characterized in that no spring and/or no distance piece is arranged between the sliding sleeve and the bearing surface.

7. The valve according to claim 1, characterized in that the armature compartment base is formed directly on the magnetic core.

8. The valve according to claim 1, characterized in that no spring is arranged between the armature compartment base and the armature.

9. The valve according to claim 1, characterized in that no distance piece is arranged between the armature compartment base and the armature.

10. The valve according to claim 1, characterized in that no adjusting device is provided for the location of the armature relative to the armature compartment base in the second position of the electromagnet.

11. The valve according to claim 1, characterized in that the armature is formed by an armature cylinder and an armature body, wherein the armature cylinder has a larger diameter than the armature body, and the armature body in the first position bears against the armature compartment base.

12. The valve according to claim 1, characterized in that the armature bar is formed integrally with the armature or the armature bar is arranged floating relative to the armature.

13. The valve according to claim 1, characterized in that the armature bar is formed integrally with the control piston.

14. The valve according to claim 1, characterized in that the armature bar is arranged floating relative to the control piston.

15. The valve according to claim 1, characterized in that the magnetic core is formed like a cup and the armature compartment base forms the base of this cup, which is adjoined by an armature compartment wall, and the armature compartment wall has, on the end facing away from the armature compartment base, a control cone which interacts with the armature, in particular the armature body.

16. The valve according to claim 1, characterized in that in the second position of the electromagnet the armature cylinder is located at the start of the control cone.

17. The valve according to claim 1, characterized in that the housing has a fixing recess for the sliding sleeve, wherein the bearing surface is arranged in the fixing recess.

18. The valve according to claim 1, characterized in that the armature compartment base and the bearing surface are oriented parallel to one another.

19. The valve according to claim 1, characterized in that the armature compartment base and/or the bearing surface are each designed as a cone.

20. A use of a valve according to claim 1 in an inlet-side pressure range from 1 bar to 40 bars, preferably in an inlet-side pressure range from 1.5 bar to 35 bars, in particular preferably in an inlet-side pressure range from 2 bars to 25 bars.

Description

BRIEF DESCRIPTION OF THE DIFFERENT VIEWS IN THE DRAWINGS

[0031] The invention is illustrated schematically, in particular, in one exemplary embodiment in the drawings. In the drawings:

[0032] FIG. 1 shows a sectional view of a valve according to the invention in a second position of the electromagnet thereof,

[0033] FIG. 2 shows a sectional view of a valve according to the invention in a second position of the electromagnet thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0034] In the drawings the same or corresponding elements are in each case designated by the same reference numerals and therefore are not described again unless this is expedient. The disclosures contained in the entire description can be transferred analogously to parts which are the same with the same reference numerals or the same component designations. Also the positional details selected in the description, such as for example top, bottom, side, etc., relate to the drawing immediately described and illustrated and may be transferred to the new position in the event of a change in position. Furthermore, individual features or combinations of features of the different illustrated and described exemplary embodiments may also constitute separate independent or inventive solutions or solutions according to the invention.

[0035] The valve 100 is shown in both figures in two different positions.

[0036] FIG. 1 shows the currentless state (position) of the electromagnet, wherein the armature 212 is shifted completely to the right by the unstressed restoring spring 460, and in this second position the control piston 500 bears against the bearing surface 235, as does the sliding sleeve 400. In FIG. 1 the control piston 500 closes the pressure connection opening 420, and the valve is shut off.

[0037] FIG. 2 shows the state (position) of the electromagnet in which it is supplied with current, wherein the armature 212 is shifted to the left towards the restoring spring 460 by the magnetic force generated by the coil, and in the first position of the electromagnet the armature 212 bears against the armature compartment base 218 (as a travel limitation). In FIG. 2 the control piston 500 clears the pressure connection opening 420, and the valve is opened.

[0038] The valve 100 extends along a longitudinal axis 105. The valve 100 is designed to be substantially rotationally symmetrical about the longitudinal axis 105, wherein deviations from the rotational symmetry do occur, for example at connections.

[0039] The valve 100 has a housing 200, which is illustrated from the exterior in FIG. 1.

[0040] An electromagnet 210 is located in the housing 200. This is only partially visible in the drawings, since it is for the most part covered by the housing 200.

[0041] The electromagnet 210 has an armature 212. An armature bar 214 is mounted on the armature. The armature 212 is movable linearly along the longitudinal axis 105 in an armature compartment 216.

[0042] In order to drive the armature 212 the electromagnet 210 has a coil which, in the drawings, is covered by the housing 200 and therefore cannot be seen.

[0043] The electromagnet 210 also has a magnetic core 220. As shown, this extends somewhat out of the housing 200 and closes the cup-like housing 200 in the direction of the valve housing 300.

[0044] A fixing recess 230 is formed in the magnetic core 220, facing the valve part 3. The function thereof will be described below. A bearing surface 235, which forms a base of the fixing recess 230, is formed in the fixing recess 230. On the side facing away from the valve part 3 (in the electromagnet 210 or housing 200) the magnetic core forms a cup-like structure which at least partially delimits the armature compartment 216. This cup-like structure includes the armature compartment base 218 which is adjoined at right angles, in the direction of the longitudinal axis 105, by the cylindrical armature compartment wall 280. This armature compartment wall 280 has, on its end facing away from the armature compartment base 218, a radially outwardly directed shoulder, which is adjoined by a control cone 270 formed as an outer cone. FIG. 1 shows that in this position the armature cylinder 290 is positioned on the tip or end of the control cone 270. The armature compartment base 218 defines the left end position of the armature 212, wherein the armature 212 in this case bears directly against the armature compartment base 218. No further components such as springs or distance pieces are located between the armature compartment base 218 and the armature 212.

[0045] Furthermore, in the magnetic core 220 a penetrating bore 225 is formed, which connects the armature compartment 216 to the fixing recess 230. The armature bar 214 extends from the armature 212 through the penetrating bore 225.

[0046] In this case the penetrating bore 225 connects the bearing surface 235 to the armature base 218. It can be readily seen that advantageously the bearing surface 235 and the armature base 218 are produced simultaneously or in the same clamping operation, in order to achieve very high precision here. On this very precisely created bearing surface 235, in addition to the control piston 500 (in the second positionsee main claimor according to FIG. 1) the sliding sleeve 400 is also supported, so that the two elements which have to co-operate for implementation of the valve function relate to the same surface, the bearing surface 235, and thus manufacturing tolerances are minimized.

[0047] In the present case the housing 200 is made of metal.

[0048] Furthermore, the valve 100 has a valve housing 300. This is made of plastic in the present case. The valve housing 300 is preferably produced as a plastic injection molded part.

[0049] Moreover, the valve 100 has a sliding sleeve 400. This is made of metal in the present case.

[0050] The valve housing 300 surrounds the sliding sleeve 400. In this case the sliding sleeve 400 is oriented so that it extends along the longitudinal axis 105.

[0051] The sliding sleeve 400 is accommodated in the aforementioned fixing recess 230 and is stabilized thereby in directions transversely with respect to the longitudinal axis 105. In this case the sliding sleeve 400 bears against the bearing surface 235 and is prevented by the bearing surface 235 from moving towards the right.

[0052] In the sliding sleeve 400 a circumferentially encircling groove 410 is formed on the outside. Complementary to this, a bead 310 which engages in the groove 410 is formed on the valve housing 300. Thus the sliding sleeve 400 and the valve housing 300 are connected to one another by form-fitting. In particular, the sliding sleeve 400 can no longer be displaced along the longitudinal axis 105 relative to the valve housing 300. This applies in both directions along the longitudinal axis 105, but in particular in the direction of the housing 200. Reference may also be made to the fact that the valve housing 300 is blocked against displacement on the sliding sleeve 400.

[0053] The valve 100 has a pressure connection 120, a working connection 130 and a tank connection 140.

[0054] The pressure connection 120 is formed radially at the side of the valve 100. It serves for delivering a pressurized fluid which should be controlled by means of the valve 100. The fluid may for example be a gas or a liquid.

[0055] The working connection 130 is formed on the end face. It is laterally delimited by a filter basket 110, which rests on the valve housing 300. The filter basket 110 carries a filter, by means of which fluid exiting from the working connection 130 can be filtered. A filter is also provided for the pressure connection 120.

[0056] The fluid exiting from the working connection 130 can be used, for example, for various control action or drive purposes, for example in an automatic transmission of a motor vehicle.

[0057] The tank connection 140 is also formed radially at the side of the valve 100. In particular a conduit leading to a tank can be connected to said tank connection, so that fluid can be delivered to the tank.

[0058] The working connection 130 is connected to a working connection opening 430 in the sliding sleeve 40. In this case the working connection opening 430 is partially concealed by the control piston 500. The connection between the working connection opening 430 and the working connection extends in the axial direction relative to the longitudinal axis 105 and is rotated by 90 relative to the view according to FIG. 1/FIG. 2.

[0059] Furthermore, a pressure connection opening 420 is formed in the sliding sleeve 400. This pressure connection opening 420 is connected to the pressure connection 120 and ensures that the fluid from the pressure connection 120 enters the interior of the sliding sleeve 400.

[0060] Moreover, a tank connection opening 440 which is connected to the tank connection 140 is formed in the sliding sleeve 400. The tank connection opening 440 ensures that fluid from the interior of the sliding sleeve 400 enters the tank connection 140.

[0061] The working connection opening 430 between the tank connection opening 440 and the pressure connection opening 420 is located in the sliding sleeve 400.

[0062] The sliding sleeve 400 bears directly against the bearing surface 235. Thus its location is defined by the machining of the magnetic core 220. No distance pieces, springs or other components are located between the sliding sleeve 400 and the bearing surface 235.

[0063] A control piston 500 is located in the interior of the sliding sleeve 400. As shown, this is structured so that it can selectively connect the connections 120, 130, 140 to one another. In the central region it has a taper in order to form a through-flow channel. The through-flow channel is delimited by control edges of the control piston 500.

[0064] In the position illustrated in FIG. 1 the working connection 130 is connected to the tank connection 140, whilst the pressure connection 120 is shut off. In this case the control piston 500 bears directly against the bearing surface 235, with no components such as a spring or a distance piece being located between them. If the control piston 500 is moved towards the left by means of the electromagnet 210, the working connection 130 is connected to the pressure connection 120, whilst the tank connection 140 is shut off. This corresponds to a conventional functionality of a valve. Thus, on the basis of the described configuration this is a slide valve. However, it should be pointed out that the configuration according to the invention can be applied not only in slide valves, but in all types of valves. The description in the context of a slide valve is given here merely by way of example.

[0065] A support cap 450 is mounted at the left-hand end of the sliding sleeve 400. This closes the sliding sleeve 400.

[0066] A restoring spring 460 is arranged between the support cap 450 and the control piston 500. This spring is supported on the support cap 450 and pushes the control piston 500 towards the right. Thus, without an application of force by the electromagnet 210 the control piston 500 remains in the position illustrated in FIG. 1. If, on the other hand, the aforementioned coil of the electromagnet 210 is supplied with current, the armature 212 is moved towards the left. This movement is transmitted by means of the armature bar 214 to the control piston 500, which likewise is moved towards the left against the force of the restoring spring 460. As a result the valve 100 can be actuated in the usual way.

[0067] Although the invention has been described with reference to precise exemplary embodiments, which are set out in the greatest detail, it is pointed out that this only serves for explanation and that the invention is not necessarily limited thereto, since alternative exemplary embodiments and procedures are clear to persons skilled in the art with reference to the publication. Accordingly, amendments may be considered which can be carried out without deviation from the content of the described invention.