DE9017107U1 - Electromagnetically operated valve - Google Patents

Description

R.24038
13.12.1990 Wd/Kc

ROBERT BOSCH GMBH, 7000 Stuttgart 10

Electromagnetically operated valve
State of the art

The invention is based on an electromagnetically actuated valve according to the type of the main claim. Such a valve is known from DE-GM 87 11 602. The residual air gap disc forms a special part that has to be very thin, ζ. β. only a few tenths of a millimeter, which makes assembly very difficult, since such a thin disc can easily be damaged.

Advantages of the invention

The electromagnetically actuated valve according to the invention with the characteristic features has the advantage that it is not only particularly simple, but also does not cause any difficulties in assembly. Further advantages of the invention emerge from the subclaims.

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drawing

An embodiment of the invention is explained in more detail in the following description and drawing. The latter shows in Figure 1 a longitudinal section through an electromagnetically actuated valve, in Figure 2 the valve together with a simplified illustration of an injection molding tool.

Description of the invention example

In Figure 1, 10 denotes the housing shell of the solenoid valve, which is designed in the shape of a sleeve and has several openings 11 on its circumference. The coil 12 is arranged inside the housing shell and sits on a central coil core 13. The coil core is penetrated by a central bore 14, which is connected to a container 16 at one end via a line 15. At that end, the housing is closed by a flow disk 18. The electrical connection parts 19 are also located there.

At the opposite end of the housing shell 10 or the coil there is a pole disk 20, followed by a flange part 21 on the same axis, the two parts being firmly connected to one another by a lower flanged edge 22 of the housing shell. In the flange part 21 there are two through holes 23, 24 running parallel to one another, which are connected to a consumer (not shown). Furthermore, in the middle of the flange part there is a blind hole 25 into which a cross hole 26 opens, which starts from the outside of the flange part and is connected to a pressure medium source 28 via a line 27. A disk armature 30 is arranged with axial and radial play in a cylindrical annular space 29, which is formed on the upper part of the flange part 21 and faces the coil core 13. This has a central bore 31 into which a spherical valve body 32 made of "glass is pressed. On both sides of the bore 31 there are continuous

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Slots 3OA, 3OB, which cannot be seen here, however, as they are offset by 90 degrees to the plane shown.

The valve body 32 interacts with two valve seats 33, 34, one of which is formed at the upper end of the bore 25 in the flange part 21, the other at the lower edge of the bore 14 of the coil core 13. A compression spring 36 acts on the disc armature 30, which is arranged in a cylindrical recess 37 on the outer circumference of the coil core 13 and loads the disc armature in such a way that the valve body 32 is pressed onto the valve seat 33 when the electromagnet is not excited.

The entire valve is overmolded with a plastic 38, for which an injection molding tool 40 (only partially shown) is used. On its upper side, i.e. facing the valve, a flat cylindrical recess 41 is formed, which is also injected with the plastic and forms the residual air gap disk 42, which lies between the pole disk 20 and the disk armature 30. This one-piece connection of the residual air gap disk with the plastic overmold 38 is particularly advantageous when assembling the valve. Before overmolding, the individual parts are inserted into the injection molding tool and then overmolded with the plastic. In this way, a compact valve unit is obtained that is inexpensive to manufacture.

When the electromagnet formed by the coil, coil core and disc armature is energized, the disc armature 30 is pulled upwards and a connection is established from the pump 28 via the valve body 32 to the holes 23 and 24 and thus to the consumer. The connection to the hole 14 in the coil body and thus from the consumer to the container 16 is blocked.

Claims (4)

R. 24038 13.12.1990 Wd/Kc ROBERT BOSCH GMBH, 7000 Stuttgart 10 Claims 1. Electromagnetically actuated valve with an approximately sleeve-shaped housing shell (10), in particular consisting of a deep-drawn sheet metal part, which accommodates a coil (12) and a coil core (13), to which a pole disk (20) and a flange part (21) provided with pressure medium channels (23 to 26) are fastened, and wherein a disk armature (30) is located between the pole disk (20) and the flange part in a cylindrical space (29) and a residual air gap disk (42) on the side of the pole disk facing it, and wherein the housing is further provided with a plastic overmold (38), characterized in that the residual air gap disk (42) is part of the plastic overmold (38). 2. Valve according to claim 1, characterized in that a flat cylindrical recess (41) forming the residual air gap disk is formed in the injection molding tool (40) for the plastic encapsulation. 3. Valve according to claim 1 and/or 2, characterized in that a central bore (31) is formed in the disc armature (30), in which a spherical valve body (32) is fixedly arranged. ~~ 4. Valve according to one of claims 1 to 3, characterized in that the valve body (32) consists of glass.