Shut-Off Body For A Valve And Valve Comprising Said Type Of Shut-Off Body

Abstract

The invention relates to a shut-off body (1) for a valve which comprises a support ring (2) and an elastic valve membrane (3) which is arranged inside the support ring and which closes the inside of the support ring, which valve membrane is essentially flat.

Claims

1. A shut-off body for a valve, which comprises a support ring and an elastic valve membrane arranged inside the support ring, which membrane closes the interior of the support ring, characterized in that the valve membrane is essentially flat.

2. The shut-off body according to claim 1, characterized in that the valve membrane has a thickness of less than 1 mm.

3. The shut-off body according to claim 1, characterized in that the support ring has a height, measured in the direction of the thickness of the valve membrane, which is at least two times thicker than the thickness of the valve membrane.

4. The shut-off body according to claim 1, characterized in that the support ring has a round cross section in a plane which contains the direction of thickness of the valve membrane and extends in a radial direction of the shut-off body.

5. The shut-off body according to claim 4, characterized in that the valve membrane is connected to the support ring at the location at which the support ring has its maximum extension in the radial direction.

6. The shut-off body according to claim 1, characterized in that the support ring and the valve membrane are one piece.

7. The shut-off body according to claim 6, characterized in that the shut-off body is manufactured by form pressing.

8. The shut-off body according to claim 1, characterized in that reinforcement elements are provided in the support ring and/or in the valve membrane.

9. The shut-off body according to claim 1, characterized in that the valve membrane is held pre-tensioned in the support ring.

10. The shut-off body according to claim 1, characterized in that the valve membrane at least partially includes an anti-adhesion coating.

11. Valve with a shut-off body according to claim 1.

12. The valve according to claim 11, characterized by a fluid opening which is closed by the valve membrane in a closed position of the valve, and which comprises a valve seat in the form of an edge against which the valve membrane is held in the closed position.

13. The valve according to claim 12, characterized in that in the closed position the circumferential line on which the valve membrane is connected to the support ring is arranged closer to the fluid opening than the part of the valve membrane which is held against the edge so that the valve membrane is expanded relative to the non-built-in form of the shut-off body.

14. The valve according to claim 13, characterized in that in an open position of the valve the valve membrane can be lifted off the edge by the fluid pressure of the fluid coming through the fluid opening onto the valve membrane while the support ring is held fast on an element of the valve housing.

15. The valve according to claim 11, characterized in that the shut-off body is a freely movable shut-off body.

16. The shut-off body according to claim 2, characterized in that the support ring has a height, measured in the direction of the thickness of the valve membrane, which is at least two times thicker than the thickness of the valve membrane, and the support ring has a round cross section in a plane which contains the direction of thickness of the valve membrane and extends in a radial direction of the shut-off body.

17. The shut-off body according to claim 2, characterized in that the support ring and the valve membrane are one piece.

18. The shut-off body according to claim 17, characterized in that reinforcement elements are provided in the support ring and/or in the valve membrane.

19. The shut-off body according to claim 18, characterized in that the valve membrane is held pre-tensioned in the support ring.

20. The shut-off body according to claim 19, characterized in that the valve membrane at least partially includes an anti-adhesion coating.

Description

[0033] The invention is explained in detail in the following using only exemplary embodiments of the invention. In the drawings:

[0034] FIG. 1 shows a cross section through a dewatering opening of a motor vehicle transmission with a shut-off body fastened to it in a first operating situation in a schematic, sectional side view;

[0035] FIG. 2 shows the opening of the motor vehicle transmission according to FIG. 1 in a second operating situation, also in a sectional side view;

[0036] FIG. 3 shows a perspective, schematic view of an outlet nozzle for windshield wiper liquid;

[0037] FIG. 4 shows a sectional, schematic view of the outlet nozzle according to FIG. 3 in a first operating situation;

[0038] FIG. 5 shows a sectional, schematic view of the outlet nozzle according to FIG. 3 in a second operating situation;

[0039] FIG. 6 shows a schematic view of a shut-off body according to the invention;

[0040] FIG. 7 shows a top view onto the shut-off body according to the invention and according to FIG. 6; and

[0041] FIG. 8 shows a sectional view of the shut-off body according to the invention and according to FIG. 6.

[0042] The shut-off body 1 shown in FIG. 6 comprises a support ring 2 constructed as an O-ring and an elastic valve membrane 3 arranged inside the support ring 2, which valve membrane closes the interior of the support ring 2. As is apparent from FIGS. 6, 7 and 8, The valve membrane is essentially flat in the completed state of the shut-off body 1.

[0043] As is apparent from FIG. 8, the support ring 2 has a round cross-sectional form in a plane which contains the direction of thickness of the valve membrane 3 and extends in the radial direction of the shut-off body 1. The FIGS. 6 to 8 show that the valve membrane 3 is connected to the support ring 2 at the location at which the support ring 2 has its maximum extension in the radial direction. FIGS. 4 and 5 show that during the inclusion of such a shut-off body in a valve, torsional forces on the shut-off body can result in that the support ring 2 rotates and the connection of the valve membrane to the support ring is moved into a position which no longer corresponds to the maximum extension of the support ring 2 in the radial direction in this inclusion position.

[0044] The FIGS. 6, 7 and 8 show that the support ring 2 and the valve membrane 3 are in one piece. This results from the fact that the shut-off body was manufactured by form pressing.

[0045] In the use of the shut-off body in a dewatering valve for the transmission housing of a motor vehicle shown in the FIGS. 1 and 2 the valve according to the invention is constructed as a valve with a freely movable shut-off body 1. FIG. 1 shows a first operating situation of the valve according to the invention. Here, the shut-off body 1 is held by its own weight in a first position in which it frees the dewatering opening 10 of the transmission housing 11 (shown only in section) of a motor vehicle. Fluid, especially liquid can exit from the dewatering opening 10 and exit via a slot 12 on the shut-off body 1 out of discharge openings 13.

[0046] In the operating situation shown in FIG. 2 the shut-off body 1 is moved by fluid entering via the outlet openings 13 in the direction of the dewatering opening 10. As a result, the valve membrane is bought in contact with a crown-shaped valve seat 14 arranged in the area of the dewatering opening 10. The valve membrane 3 seals the dewatering opening 10 by resting on the crown of the valve seat 14. When the fluid entering through the outlet openings 13 presses the support ring closer to the dewatering opening 10 than the part of the valve membrane 3, which is held against the edge, the valve membrane 3 is expanded in comparison to the non-built-in form of the shut-off body 1. This produces return forces which lead to an increase of the sealing forces and therefore to a better seal of the dewatering opening 10. In addition, it makes possible the expansion of the valve membrane 3, the compensation of rugosities or uneven areas of the crown-shaped valve seat and nevertheless results in a good sealing action.

[0047] The valve shown in FIGS. 1 and 2 comprises a valve cover 17 which is screwed onto a threading 15 of the transmission housing 11. The outlet openings 13 are provided in the valve cover 17. A recess 16 also provided in the valve cover 17 carries the shut-off body 1 in the embodiment shown in FIG. 1 and prevents the shut-off body 1 from (partially) closing the exit openings 13.

[0048] The outlet nozzle 20 shown in FIG. 3 for bringing out windshield wiper water comprises the nozzle outlet 21 from which the windshield wiper water exits. Furthermore, the outlet nozzle 20 comprises an inlet conduit 22 and an outlet conduit 23 by which the outlet nozzle 20 can be connected to a circuit for windshield wiper water. An insert element 24 is provided inside the outlet nozzle 20. The insert element 24 forms a conduit 25 through which windshield wiper water can flow to the outlet nozzle 21. Furthermore, the insert element 24 holds the support ring 2 of the shut-off body 1 firmly in the outlet nozzle 20. In the structural situation shown in FIG. 4 the valve membrane 3 is pressed against a crown-shaped valve seat 26 of a fluid opening 27. The valve membrane is slightly expanded here in contrast to the non-built-in form of the shut-off body 1. As a consequence, the valve membrane can compensate uneven areas, deviations of tolerance in the manufacture of the crown-shaped valve seat 26 and rough surfaces of the valve seat 26 and can seal the fluid opening 27 well. As a consequence, it prevents a backflow of the fluid present in the chamber 28. The inlet conduit 22 and the outlet conduit 23 border the chamber and therefore connect the chamber 28 to the windshield wiper water circuit.

[0049] If the fluid pressure is raised in the windshield wiper water circuit and therefore also inside the chamber 28, the valve membrane is lifted off from the crown-like valve seat 26 and pressed into a chamber 29 of the insert element 24. As a consequence, it makes it possible for the fluid to flow between the crown-shaped valve seat 26 and the valve membrane 3 and past the support ring 2 into the conduit 25.