JPH07263875A - Casing for housing at least one electric printed wiring board of electric switching device or control device - Google Patents

Abstract

PURPOSE: To manufacture all necessary seals by a single operating process by charging first fluidized and then cured sealing material in corresponding passage system, even in the case of a complicated extended shape of a sealing system. CONSTITUTION: This casing for containing at least one electric printed circuit board comprises a casing member 1, a plug-in coupling member 4 for forming a constituting unit 2 having coupled electric printed circuit board 3, a seal 5, and another casing member 6. The member 4 has a step 22 called recess for receiving an edge range 21 of the member 6. A relatively complicated seal 5 is generated by the structure. This seal 5 is not formed of a premolded material but obtained by charging first fluidized and then curing material such as, for example, a polyurethane silicone mixture.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casing of the type described in the preamble of claim 1 for use, for example, in switching devices or control devices for internal combustion engines of motor vehicles.

[0002]

A casing of this type is known from German Utility Model DE 8306171. This casing requires a large number of preformed seals between its various components and the plug-in connection formed in the form of a plug disc, which requires relatively large storage. It is a disadvantage. Of course, such a problem becomes more serious when manufacturing casings having different sizes or different shapes. Furthermore, in the prior art, the structural height becomes relatively high in the direction perpendicular to the main planes of both casing members.
This is because the plug-in coupling member is mostly covered by the casing member.

European Patent Publication No. 0082224
In the casing known from U.S. Pat. No. 8, there is provided a passage between the mutually overlapping surfaces of the components which are intimately connected to one another, which passage, after combining these components, A sealing material that is initially fluid and then hardens is filled. In this connection, it is known from EP 0 336 138 to use sealing materials of different composition which foam to form cells.

[0004]

SUMMARY OF THE INVENTION The object of the invention is therefore to improve the casing of the type mentioned at the outset and to improve the storage and construction space, such as the problems caused by the insertion of preformed seals. An object of the present invention is to provide a casing having a configuration that does not require consideration of points.

[0005]

According to the invention, the object is 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]

It has become clear that, for example, a polyurethane / silicone mixture can be used as a sealing material to produce a sealing system having a plurality of passages branched from one another.
The present invention takes advantage of this by providing all the necessary seals, despite the relatively complex extension of the seal system.
It can be manufactured in a single working process by filling the corresponding passage system with an initially fluid and then hardening sealant.

This relatively complex shape of the sealing system is achieved by providing, in particular, the plug-in coupling member and the other casing member, which does not receive the printed wiring board, with mutually matching shapes selected in view of the minimum dimensions of the casing. It is defined, i.e. by being shaped so that the plug-in connecting member is not covered by the other casing member because the plug-in connecting member is provided with a step. In other words, the other casing member has a cutout on the end face side and accordingly ends on this end face side before the plug-in coupling member. The plug-in coupling member fills the notch and does not project beyond the plane of the other casing member, but at this end face forms the main component of the side wall of the casing.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows an exploded view in which a casing according to the present invention is disassembled vertically. In this exploded view, one casing member 1 on the lower side as viewed in the drawing, a plug-in connecting member 4 forming a constituent unit 2 having an integrated electric printed wiring board 3, a seal 5, and The other casing member 6 on the upper side as viewed is shown.

A lower casing member 1 made of a heat conductive material, for receiving a printed wiring board 3,
It has a recess limited by the step 7. Furthermore, as can be seen from the drawings, the upwardly facing edge surface 8 of the casing member 1
A groove 9 is provided which extends over the entire circumference, which groove 9 preferably has a semicircular cross section. In the assembled state of the casing, the groove 9 forms a closed passage in the area of the front, rear and left sides as seen in the drawing, together with the corresponding groove provided on the U-shaped edge 10. This passage is formed by the edge surface 8 of the casing member 1 on the right side in the drawing.
In the range of, in combination with the corresponding groove 11 provided on the mounting surface 12 of the insertion coupling member 4 mounted in this range,
Form a passage that extends completely around the entire circumference. This passage forms or incorporates a substantially rectangular sealing strand 13 in plan view after filling with the sealing material.

In order to tightly receive the plug-in coupling member 4,
A notch 14 is provided on the end surface of the upper casing member 6. The notch 14 is limited by the slopes 15 and 16. In this case, the sloped surfaces 15, 16 are based on the fact that the insert coupling member 4 is provided with end surfaces 17, 18 with the same slope, and the insert coupling member 4 or, more precisely, the component unit 2 is seen from below in the drawing. It is formed so that it can be moved to the end position of the upper casing member 6 (after being inserted into the lower casing member 1). In order to guide during this movement and to prevent relative movement between the casing members 1 and 6 that is performed in parallel with the plane of the printed wiring board 3, web-shaped projections 19 are provided on both the inclined surfaces. And this protrusion 19
And a groove 20 for receiving is formed, which forms a rail-shaped guide for the bayonet coupling member 4.

The plug-in connecting member 4 has a step 22 which can be referred to as a recess in order to receive the edge region 21 of the upper casing member 6, so that the edge region 21 covers the plug-in connecting member 4 as a whole. Instead of overhanging, it is supported in the recess of the plug-in coupling member 4. This structural principle gives rise to a relatively complex seal, the final shape of which is designated by the reference numeral 5. Seal strand 13 formed by said grooves 9, 11 and said another groove (not visible in the drawing)
Another groove 23 is branched on the side of the insertion coupling member from a passage that extends over the entire circumference for receiving. This groove 23 is end face 1
7 and 18 and the surface of the step 22 form another passage with a corresponding groove 24 provided in a corresponding surface of the upper casing member 6, which passage forms another seal. Receive the strand 25. In other words, if the casing is disassembled again into its individual parts, a relatively complex seal, indicated by 5, is obtained.

As already mentioned, this seal 5 is not formed from a preformed material, but is obtained by filling it with a material which is initially fluid and then hardens (for example a polyurethane-silicone mixture). . In order to fill this 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. , Forming a filling opening. Furthermore,
Overflow openings 28, 28a are provided. These various openings are in the seal 5 as projections 29 corresponding to the filling openings and overflow openings 28, 28a.
Is recognized as a protrusion 30 corresponding to. The overflow openings 28, 28a are arranged to be filled with the sealing material only after the original production of the seal strands 13, 25 is completed.

The casing according to the invention has the advantage that a secure seal to the outside is achieved in a structural form that does not require the storage of preformed seals and is space-saving.

[Brief description of 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 Constituent unit 3 Printed wiring board 4 Plug-in connecting member 5 Seal 6 Casing member 7 Step part 8 Edge surface 9 Groove 10 Edge part 11 Corresponding groove 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

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Thomas Jesberger, Federal Republic of Germany Eberdingen im Kaiserfeld 5 (72) Inventor, Gerhard Klein, Federal Republic of Germany Gifhorn Tunkamp 34

Claims (3)

[Claims] 1. A casing for accommodating at least one electrical printed wiring board of an electrical switching device or a control device, the casing members having two cover-like shapes and having edges that overlap each other. And a plug-in connecting member, which is assigned to the printed wiring board and is fastened between the edge regions of both casing members, and is received in a groove between the mutually facing edge surfaces of both casing members and the plug-in connecting member. In the type having a seal, the printed wiring board (3) directly supports the plug-in coupling member (4) in the area of one edge of the printed wiring board (3) and one casing member (1). ), The casing member (1) of one of the casing member (1) and the mounting edge face of the other casing member (6) and the mounting edge face of the plug-in coupling member (4). All facing It has a groove (9) extending over the circumference, the groove (9) forming a passage together with a corresponding groove (11) provided on the edge surface, and from the passage,
Similarly, another passage is formed by a pair of grooves (23, 24) facing each other, and the other passage is connected to both end faces (17, 18) of the insertion coupling member (4) and the both ends. It extends along a step (22) on the side of the plug-in coupling member which extends between the faces (17, 18), said end face corresponding to a predetermined cone angle open in the direction of one casing member (1). And extends diagonally and is mounted on the slopes (15, 16) of the other casing member (6) extending at the same inclination, and the step (22) is the edge of the other casing member (6). It is covered by a partial area (21) and is filled with a sealing material which is initially fluid and then hardens after the two passages have been combined with the two casing members (1, 6) and the bayonet coupling member (4). One-piece seal (5)
A casing for housing at least one electrical printed wiring board of an electrical switching device or a control device, characterized in that a casing is formed. 2. At least one filling opening (26, 27) for sealing material in at least one of said passages and at least one
Two overflow openings (28, 28a) are assigned, and the overflow opening (28, 28a) is the overflow material (28, 28a) for the first time after the seal is manufactured.
A casing according to claim 1, arranged in a position such that it can be drained from a). 3. The end faces (17, 1) of the plug-in coupling member (4).
8) and the other casing member (6) mounted on the end face
And the slanted surfaces (15, 16) of the casing are parallel to the plane of the printed wiring board (3) via rail-shaped guide portions (19, 20) that prevent relative movement between the casing portion and the insertion coupling member. The internal passage or the external engagement, and the another passage bypasses the guide portion (19, 20).
The casing described.