JPH06295757A - Spigot strip for electronic controller of car - Google Patents

Abstract

PURPOSE: To reliably receive an insertion force on an inserted strip piece. CONSTITUTION: In this inserted piece for an electronic controller of an automobile, a connection part 26 of a wire distribution plate 22 comprises an additional support face 27 for a solder paste. Moreover, the connection part 26 comprises a hole 23 and the connection section 18 of a contact member 14 is brought into contact with the connection part 26 in a plane and extended through at least a fixed section 19 and the fixed section is inserted into the hole 23 to fix the support face 27 of the connection part in the hole by the solder paste in a form connection manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug-in strip for an electronic control unit of a motor vehicle, which is provided for SMD assembly and has a contact member arranged in an insulator. The connection section of the contact member is connected to the connection portion provided on the upper surface of the wiring plate.

[0002]

BACKGROUND OF THE INVENTION With the increasing functional range of electronic vehicle controls, the number and density of electronic components mounted on the wiring boards of the controller increases. In the past, components were plugged into the wiring plate through their assembly holes at their connection sections, and were electrically connected to the conductor tracks of the wiring plate and mechanically stable, usually by swell soldering (Schwalloetung) on the back side of the wiring plate. It is permanently fixed to the wiring plate, and therefore for reasons of cost, the mounting on the wiring plate is increasingly done by SMD technology.

SMD technology (surface mounted devices
(= Surface-contact assembled component), a wiring plate having no assembly hole is used. In SMD technology, the connection sections of the components are placed on a special connection surface of the wiring plate with the crimped solder paste, and the connection surface is formed by reflow soldering, which melts the solder paste. Is materially connected to.

Swell soldering technology (Schwalloettech
nik) is used to fix the connection section of the contact member to the wiring plate in a shape-connecting manner by the built-in hole of the wiring plate, the connection section is made by SMD / technique exclusively by soldering on the surface of the wiring plate for material connection. Held in.

Such a connection tends to disadvantageously lead to functional failure during mechanical loading, because of the mechanical loading forces caused by soldering due to defects in the form connections within the assembly holes of the wiring plate. This is because soldering does not have the necessary strength for such loads.

Furthermore, as the functional range of the electronic control unit increases, the number of plug-in connection parts in the plug-in strip increases, which makes it possible to connect the contact members with the connecting plate and the wiring plate based on a large plug-in force. This increases the mechanical load on the connection between the connection surface and the connection surface, and undesirably increases the tendency of the controller to fail.

[0007]

In order to satisfactorily avoid the disadvantages mentioned above, according to the invention, the contact elements of the plug-in strip are inserted into the holes of the wiring plate by means of fixed sections, where there are special support surfaces. Meltable solder paste (Lotp
It is fixed in a shape-connecting manner by means of aste), so that the insertion force acting on the insertion strip can be reliably received.

Advantageous configurations of the invention are described in the subclaims.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENT The plastic insulator 11 of the bayonet strip 12 has at its end face a receptacle 13 for receiving a counter socket (not shown).

A large number of contact members 14 configured as flat plugs are embedded in the insulator 11. The contact members 14 arranged in two rows are provided with a plug-in section 16 so that the insulator 1
It protrudes from 1 to the front in the receptor 13. Contact member 1
The other end of 4 projects rearwardly from the insulator 11 and forms a lead-in section 17, a connecting section 18 and a fixed section 19.

Starting from the rear side of the insulation 11, the lead-in section 17 is oriented in the first part in the same direction as the associated insert section 16. The lead-in section 17 is provided with the insulator 11 after the arc-shaped bent portion in the direction of the wiring plate 22.
Of the connecting section 18 extending in parallel to the back surface of the
The connection section is oriented in the same direction as the insertion section 16 and is in contact with the upper surface 21 of the wiring plate 22. The connecting section 18 is bent at a right angle in the range of the hole 23 and is transferred to the fixed section 19 which projects into the hole 23.
On the upper surface 21 of the wiring plate 22, the connection section 18 is in contact with the strip-shaped connection section 26, which is extended by a support surface 27 which is not covered by the connection section 18.
A conductor track 28, which is schematically shown, extends from the support surface 27,
The conductor tracks make electrical connections to components (not shown) incorporated on the wiring plate 22.

Wiring plate 22 is configured for SMD-assembly. For this purpose, the connecting portion 26 and the supporting surface 2
Before soldering, 7 is formed as a thick layer by screen printing (Sieb-druckverfahren) with solder existing as a solder paste 29 when it is mounted on the wiring plate 22. The connection section 18 is pressed into the solder paste 29, and the fixed section 19 inserted into the associated hole 23 of the wiring plate 22 is connected to the solder paste 29 on the support surface 27.

As a modified example, a holding section 31 is arranged behind the fixed section 19, and the holding section is the wiring plate 22.
The back surface 32 opposite to the connection portion 26 is in contact with it by bending, so that the contact member 14 incorporated on the wiring plate 22 is additionally secured.

The back surface 32 of the wiring plate 22 is covered with a base plate 33 for heat dissipation. In this case, the heat conductive insulating layer 34 disposed on the base plate 33 is made of rubber or another insulating member. Made of Such an insulating layer 34 is normally a closed plate, in a variant the insulating layer is interrupted in the region of a notch 36 formed in the base plate 33 facing the hole 23 of the wiring plate,
It is also provided in the bottom portion 37 of the notch 36. Cutout 36
Are defined such that they respectively surround the holding sections 31 at a radial distance.

The solder paste 29 provided on the connecting portion 26 and the supporting surface 27 is welded to the contact member 14 on the wiring plate 22 by the thermal action after the insertion strip 12 is assembled. As a result, on the one hand the connecting section 18 is materially connected with the associated connecting portion 26 and, on the other hand, the solder paste 29 reaches from the supporting surface 27 along the fixing section 19 into the associated hole 23 by capillary action. . The amount of solder paste 29 on the support surface 27 is such that the holes 23 are completely filled with solder and, after cooling of the solder, the walls of the holes 23 and the fixed sections 19 are fixed.
It is specified that a stable bond between and occurs.

After soldering, the bayonet strips 12 are held on the wiring plate 22 by screw connections (not shown), the contact members 14 being mechanically and electrically connected to the wiring plate 2.
Is bound to two.

Due to the construction of the pull-in section 17, the plug-in force transmitted to the wiring plate 22 when the plug-in section 16 is connected to the opposite socket is slightly different at the contact point between the connecting section 18 and the connecting section 26. It has been reduced to the extent that it only has an effect. For this reason, the pull-in section 17 has the characteristic of an expansion and contraction loop by the arcuate bent portions that are opposite to each other, and such arcuate bent portions reduce the insertion force by the inward deformation. The reduced plug-in forces are completely taken up by the wide area solder joints which produce a shear load in the area of the connecting section 18 and a compressive or tensile load in the area of the fixed section. Therefore, the respective connection between the connection 26 and the connection section 18 is also protected from the mechanical load caused by the expansion forces due to temperature changes. Therefore, with the plug-in strip according to the invention and the wiring plate adapted to it, the advantages of the SMD / assembly technique are also given.
4 and the connection of the wiring plate 22 with the advantages of mechanical stability.

[Brief description of drawings]

1 is a cross-sectional view of a portion of an insert strip and a wiring plate according to the present invention.

FIG. 2 is a partial plan view of the insertion strip and the wiring plate of FIG.

[Explanation of symbols]

11 Insulator, 12 Insert Strip, 13 Receptor, 14 Contact Member, 16 Insert Section, 1
7 pull-in section, 18 connection section, 19 fixed section, 21 upper surface, 22 wiring plate,
23 holes, 26 connection portion, 29 solder paste, 31 holding section, 32 back surface, 33
Base plate, 34 insulating layer, 36 notch,
37 bottom

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Reinhard Fasel Oberusbach Heberstraße Germany 9 (72) Inventor Herbert Klinger Germany Nuremberg Beimbacher Weg 16 Ar (72) Inventor Hartmut Zeble Germany Republic Furth Moststrasse 25

Claims (4)

[Claims] 1. A plug strip for an electronic control unit of a motor vehicle, which is provided for SMD assembly.
It has a contact member (14) arranged in an insulator (11), and a connection section (18) of the contact member is connected to a connection portion (26) provided on the upper surface (21) of the wiring plate (22). In the connected form, the connection part (26) is provided with an additional support surface (27) for the solder paste and has holes (23), and the connection section of the contact member (14). The (18) is in plane contact with the connection (26) and is extended by at least the fixed section (19), the fixed section being inserted into the hole (23) and the support surface (27) of the connection. Plug-in strip for an electronic control unit of a motor vehicle, characterized in that it is form-fitted in the hole (23) by means of the solder paste according to (4). 2. The hole (23) is configured as a through hole through the wiring plate (22), the fixed section (19) is transferred into the holding section (31), and the holding section is provided with the hole (2).
3) penetrating through the wiring plate (22) and connecting part (2
The back surface (32) opposite to the above (6) is applied.
Insert strips listed. 3. The solder paste (29) is adapted to be melted by heating, in which case the connection section (1)
8) is electrically coupled to the associated connection (26), and the fixing section (19) is fixedly fixed in the hole (23) by the inflow of solder paste (29) from the support surface 27. Insert strip according to claim 2. 4. Each contact member (14) has a connection section (18).
Has a pull-in section (17) between the same-oriented plug-in section (16) connectable to the opposite socket, the pull-in section having a connecting section (18) and a plug-in section (1).
6) extending substantially perpendicularly to 6) and transitioning into the plug-in section (16) on the one hand and into the connecting section (18) on the other hand via arcuate opposite curves. From 3
Insert strips according to any one of.