JP3764503B2 - Casing for housing at least one electrical printed wiring board of an electrical switching device or control device - Google Patents

Description

[0001]
[Industrial application fields]
The invention relates to a casing of the type described in the superordinate concept of claim 1, used for example in a switching device or control device for an internal combustion engine of a motor vehicle.
[0002]
[Prior art]
A casing of this type is known from German Utility Model No. 8306171. In this casing, a large number of preformed seals are required between its various components and a plug-and-joint member formed in the form of a plug board, so a relatively large-scale storage is required. It is disadvantageous. Of course, such a problem becomes more serious when manufacturing casings having different sizes or different shapes. Furthermore, conventionally, the structural height is relatively high in the direction perpendicular to the main planes of both casing members. This is because the insertion coupling member is almost covered by the casing member.
[0003]
In addition, in the casing known from EP-A-0082248, passages are provided between the surfaces of the components that are tightly coupled to one another, which are located one on top of the other. After the combination, the sealing material which is initially fluid and then hardens is filled. In this context, it is known from EP 0336138 to use sealing materials of different compositions that foam to form bubbles.
[0004]
[Problems to be solved by the invention]
The object of the present invention is therefore to improve the casing of the type mentioned at the outset, in terms of storage and construction space, without having to take into account the problems which arise from inserting pre-formed seals. It is to provide a casing having the same.
[0005]
[Means for Solving the Problems]
According to the invention, the object has been solved by the casing according to the invention as defined in the characterizing part of claim 1. Advantageous configurations of the invention are described in the other claims.
[0006]
【The invention's effect】
For example, it has become clear that a polyurethane / silicone mixture can be used as a sealing material to produce a sealing system having a plurality of paths branched from each other. The present invention takes advantage of this to fill all the required seals into the corresponding passage system with a seal that initially flows and then cures, despite the relatively complex extension of the seal system. Can be manufactured in a single work process.
[0007]
The shape of this relatively complex seal system is specified by giving the plug casing and the other casing member, which does not accept the printed wiring board, a shape compatible with each other chosen in consideration of the minimum dimensions of the casing. In other words, since the step is provided on the insertion coupling member, the insertion coupling member is defined by being shaped so that it is not covered by the other casing member. In other words, the other casing member has a notch on the end surface side, and accordingly ends on the end surface side in front of the insertion coupling member. The plug-in coupling member fills the notch and does not protrude beyond the plane of the other casing member, but forms the main component of the side wall of the casing at this end face.
[0008]
【Example】
In the following, embodiments of the invention will be described in detail with reference to the drawings.
[0009]
FIG. 1 shows an exploded view in which the casing according to the present invention is broken up and down. This exploded view includes a casing member 1 on the lower side as seen in the drawing, a plug-in coupling member 4 that forms an integrated unit 2 having an electric printed wiring board 3 integrated, a seal 5, and The other casing member 6 on the upper side as viewed is shown.
[0010]
The lower casing member 1 made of a thermally conductive material has a recess limited by a step 7 for receiving the printed wiring board 3. Furthermore, as can be seen from the drawings, the upward edge surface 8 of the casing member 1 is provided with a groove 9 extending over the entire circumference, which groove 9 preferably has a semicircular cross section. Yes. In the casing assembly state, the groove 9 forms a closed passage in the same manner as the corresponding groove provided in the U-shaped edge 10 in the front, rear and left side groove ranges as seen in the drawing. In the range of the edge surface 8 of the casing member 1 on the right side as viewed in the drawing, this passage is coupled with the corresponding groove 11 provided in the mounting surface 12 of the insertion coupling member 4 mounted in this range. A passage extending over the entire circumference is formed. This passage forms or incorporates a substantially rectangular sealing strand 13 in plan view after filling with sealing material.
[0011]
In order to closely receive the insertion coupling member 4, a cutout 14 is provided on the end surface of the upper casing member 6. This notch 14 is limited by slopes 15 and 16. In this case, the inclined surfaces 15, 16 are based on the fact that the end faces 17, 18 having the same inclination are provided on the plug-in coupling member 4. It is formed so that it can be moved to the end position in the upper casing member 6 (after being inserted into the lower casing member 1). In order to guide this movement and to prevent relative movement between the casing members 1 and 6 performed in parallel to the plane of the printed wiring board 3, the web-shaped protrusions 19 are respectively provided on the both inclined surfaces. And a groove 20 for receiving the projection 19, which form a rail-shaped guide for the plug-in coupling member 4.
[0012]
In order to receive the edge range 21 of the upper casing member 6, the insertion coupling member 4 has a stepped portion 22 that can be referred to as a recess, so that the edge range 21 entirely covers the insertion coupling member 4. Instead, it is supported by the recess of the insertion coupling member 4.
This structural principle results in a relatively complex seal whose final shape is denoted by 5. Another groove 23 diverges on the insertion coupling member side from a passage formed by the grooves 9 and 11 and the other groove (not shown in the drawings) and extending over the entire circumference for receiving the seal strand 13. ing. The groove 23 extends over the end surfaces 17 and 18 and the surface of the step portion 22, and forms another passage in combination with the corresponding groove 24 provided on the corresponding surface of the upper casing member 6. Accepts another sealing strand 25. That is, when the casing is disassembled again into individual members, a relatively complicated seal indicated by reference numeral 5 is obtained.
[0013]
As already explained, this seal 5 is not formed from a preformed material, but is obtained by filling a material that is initially fluid and then hardened (for example a polyurethane-silicone mixture). In order to fill the passage with this material, the lower casing member 1 and the upper casing member 6 are provided with recesses 26 and 27 communicating with the grooves, respectively. To form a filling opening. In addition, overflow openings 28, 28a are provided. These various openings are recognized in the seal 5 as protrusions 29 corresponding to the filling openings and as protrusions 30 corresponding to the overflow openings 28, 28a. The overflow openings 28 and 28a are arranged so as to be filled with the seal material only when the original production of the seal strands 13 and 25 is completed.
[0014]
The casing according to the invention has the advantage that a reliable seal against the outside is achieved in a structural form that does not require storage of pre-formed seals and does not take up space.
[Brief description of the drawings]
FIG. 1 is an exploded view of a casing according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Casing member 2 Configuration unit 3 Printed wiring board 4 Insertion connection member 5 Seal 6 Casing member 7 Step part 8 Edge surface 9 Groove 10 Edge part 11 Corresponding groove | channel 12 Mounting surface 13 Seal strand 14 Notch 15, 16 Slope 17, 18 End face 19 Protrusion 20 Groove 21 Edge range 22 Step 23, 24 Groove 25 Seal strand 26, 27 Recess 28, 28a Overflow opening 29, 30 Protrusion

Claims (3)

A casing for accommodating at least one electrical printed wiring board of an electrical switching device or control device, two cover-like casing members having edges positioned so as to overlap each other, and the printed wiring board And an insertion coupling member fastened between the edge areas of both casing members and a seal received in the groove between the facing edge surfaces of both casing members and the insertion coupling member. The printed wiring board (3) directly supports the plug-in coupling member (4) in one edge region and is provided on one casing member (1). The one casing member (1) is received in the recess (7) and faces the mounting edge surface of the other casing member (6) and the mounting edge surface of the insertion coupling member (4). Over the lap The groove (9) has a passage formed in combination with the corresponding groove (11) provided on the edge surface, and from the passage, a pair of pairs facing each other in the same manner. Another passage formed by the groove (23, 24) is branched, and the other passage is formed at both end faces (17, 18) of the insertion coupling member (4) and the both end faces (17, 18). Extending along the step (22) on the side of the insertion coupling member extending in between, the end face extending obliquely corresponding to a predetermined cone angle opened in the direction of one casing member (1). And the other casing member (6) is mounted on the slopes (15, 16) extending at the same inclination, and the step (22) is covered by the edge range (21) of the other casing member (6). In both the passages, both casing members (1, 6) and insertion coupling members (4) At least one electrical switch or control device, characterized in that it is filled with a sealing material that is initially fluid and then hardened to form an integral seal (5). A casing for accommodating printed wiring boards. Both passages are assigned at least one filling opening (26, 27) for sealing material and at least one overflow opening (28, 28a), the overflow opening (28, 28a) being a seal. 2. A casing according to claim 1, wherein the casing is arranged in such a position that the sealing material flows out of the overflow opening (28, 28a) for the first time after production. The end face (17, 18) of the insertion coupling member (4) and the slope (15, 16) of the other casing member (6) mounted on the end face are parallel to the plane of the printed wiring board (3). Are engaged with each other via rail-like guide portions (19, 20) that prevent relative movement between the casing portion and the insertion coupling member, and the other passage is connected to the guide portions (19, 20). The casing according to claim 1 or 2, wherein the casing is bypassed.

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