EP2437352B1 - Solder joint - Google Patents

Description

The invention relates to a fuze base according to the preamble of claim 1.

There are known solder joints for attaching a thin pin to a surface substantially at right angles. In this case, the pin is provided with a substantially planar end face, which is butt soldered to the surface. The disadvantage of this is that the pens in question, due to the mass production, have no flat faces, and therefore a corresponding processing step is required before the solder joint can be made. Furthermore, such a solder joint tends to shear off the pins, and has the disadvantage of low vibration resistance. This is particularly disadvantageous when using correspondingly processed assemblies in vehicles disadvantage, since this can lead to increased failure rates. This has a particularly disadvantageous effect when used in safety-relevant devices, such as an igniter for an airbag, whose function must be ensured, in particular, at high accelerations occurring.

There are further known solder joints in which the production of a flat surface according to the preceding paragraph is dispensed with. According to a first such known solder joint is provided to blunt the rounded ends of a contact pin to a surface. Such designs also have very poor mechanical properties. According to a second such known solder joint is provided to guide a pin through a through hole and attach a conventional solder joint on both sides in the throat between the pin and the body. However, such solder joints are very inflexible in use.

From the US 2010/0199872 A1 a fuze base according to the preamble of claim 1 with an electrically conductive base body is known, wherein an electrically conductive connected to the main body first contact pin is guided through the body, and wherein a second contact pin, electrically insulated from the base body and gas-tight, is guided through the body ,

From the US 3 906 858 A is a miniature igniter with two separate electrically conductive parts, which by an ignition bridge with each other are known.

The object of the invention is therefore to provide a Zündersockel with a solder joint of the type mentioned, with which the mentioned disadvantages can be avoided, with which the preparatory work for the preparation of a semifinished product can be reduced to the solder joint, and the safety of the solder joint, especially against Shearing, can be increased, and which is flexible. This is achieved by the features of claim 1 according to the invention.

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Thereby, a solder joint can be formed, which has a high security against mechanical damage, especially against shearing, since due to the wetting of both the pin, and the lateral surface of the first recess any notch effects are avoided, and a lateral force transmission via the solder material on the lateral surface the first recess is made possible. As a result, furthermore, a pin can essentially be processed without further preparatory mechanical processing since no planar end face is required. This allows pins with rounded or sharpened ends to be securely soldered without further processing of such ends. According to today's conventional manufacturing method, corresponding pins, such as for the most preferred use in ignition base for gas generator igniter, after their production rounded ends. Such pins can now be processed without further post-processing. As a result, the production costs and the production costs can be reduced. A solder joint is also versatile and flexible.

The subclaims, which as well as the patent claim 1 simultaneously form part of the description, relate to further advantageous embodiments of the invention.

• Fig. 1 eine erste bevorzugte Ausführungsform eines erfindungsgemäßen Zündersockels für Gasgeneratoren mit einer Lötverbindung im Grundriss;
• Fig. 2 die Ausführungsform gemäß Fig. 1 in axonometrischer Ansicht;
• Fig. 3 Schnitt A-A gemäß Fig. 1;
• Fig. 4 ein Beispiel eines Zündersockels für Gasgeneratoren mit einer Lötverbindung im Grundriss;
• Fig. 5 das Beispiel gemäß Fig. 4 in axonometrischer Ansicht;
• Fig. 6 Schnitt B-B gemäß Fig. 4;
• Fig. 7 ein weiteres Beispiel eines Zündersockels für Gasgeneratoren mit einer Lötverbindung im Grundriss;
• Fig. 8 das Beispiel gemäß Fig. 7 in axonometrischer Ansicht;
• Fig. 9 Schnitt C-C gemäß Fig. 7;
• Fig. 10 ein weiteres Beispiel eines Zündersockels für Gasgeneratoren mit einer Lötverbindung im Grundriss;
• Fig. 11 Schnitt D-D gemäß Fig. 10; und
• Fig. 12 Detail G gemäß Fig. 11.

The invention will be described in more detail with reference to the accompanying drawings, in which only preferred embodiments are shown by way of example. Showing:

• Fig. 1 A first preferred embodiment of a Zündung socket according to the invention for gas generators with a solder joint in plan view;
• Fig. 2 the embodiment according to Fig. 1 in axonometric view;
• Fig. 3 Section AA according to Fig. 1 ;
• Fig. 4 an example of a fuze base for gas generators with a solder joint in plan view;
• Fig. 5 the example according to Fig. 4 in axonometric view;
• Fig. 6 Section BB according to Fig. 4 ;
• Fig. 7 another example of a fuze base for gas generators with a solder joint in plan view;
• Fig. 8 the example according to Fig. 7 in axonometric view;
• Fig. 9 Section CC according to Fig. 7 ;
• Fig. 10 another example of a fuze base for gas generators with a solder joint in plan view;
• Fig. 11 Section DD according to Fig. 10 ; and
• Fig. 12 Detail G according to Fig. 11 ,

The Fig. 1 to 12 each show arrangements or details of arrangements of an electrically conductive body 1 and a - connected by means of a solder connection to the body 1 - electrically conductive first pin 2, wherein in a first surface 3 of the body 1, a first recess 4 is arranged, wherein the first pin 2 is arranged in regions in the first recess 4, wherein in a gap 5 between a first lateral surface 6 of the first recess 4 and the first pin 2, a solder material 7 is arranged, and wherein the solder material 7 at least partially on both the first pin. 2 , as well as on the first lateral surface 6 is arranged.

Thereby, a solder joint can be formed, which has a high security against mechanical damage, especially against shearing, since due to the wetting of both the first pin 2, and the first lateral surface 6 of the first recess 4 any notch effects are avoided, and a lateral power transmission via the solder material 7 is made possible on the first lateral surface 6 of the first recess 4. As a result, furthermore, a first pin 2 can be processed essentially without further preparatory mechanical processing, since no plane end face is required. This allows pins with rounded or sharpened ends to be securely soldered without further processing of such ends. According to today's conventional manufacturing process, corresponding pins, for example for the particularly preferred use in detonator socket 13 for gas generator igniter, after the production of rounded ends on. Such pins can now be processed without further post-processing. As a result, the production costs and the production costs can be reduced. A solder joint is also versatile and flexible.

The term solder joint designates a connection of two or more metallic parts by means of a molten solder, which at least partially wets the surfaces of the at least two interconnected parts, in particular at least partially diffused into the respective surfaces. The term solder material preferably comprises any type of alloy and / or a pure metal which can be used for hard and / or soft soldering, in particular any type of solder or solder.

The invention relates to fuze base 13, as used for example in gas generators, airbags or belt tensioners for safety belts in vehicles use. A gas generator is a fire set, which is provided and designed so that its combustion gases fill a cavity, such as the interior of an airbag. The Fig. 1 to 12 show four different ignition socket 13. Subsequently, the solder joint is explained in detail. However, the use of solder joints is not limited to this application. This can also be provided for connecting other components or assemblies.

The subject invention relates to a Zündersockel with a solder joint in which is provided to connect a first pin 2, therefore a thin rod with a preferably round cross-section, with a body 1. The body 1 has - to form the solder joint - a first surface 3, in which a first recess 4 is arranged.

The first recess 4, which may be of different design, has a bottom region 8 and a first lateral surface 6. The bottom region 8 denotes a bottom of the first depression 4 and preferably the region surrounding this base normal to the first surface 3, in particular if the floor is not flat. The first lateral surface 6 denotes the surface which extends between the first surface 3 and the bottom region 8. It is preferably provided that the first lateral surface 6 is at least partially inclined and / or rounded relative to the first surface 3. It is preferably provided that the first recess 4 is frusto-conical or truncated pyramid shaped.

The first pin 2 is arranged at least partially in the first recess 4. It is preferably provided that a diameter or a diagonal of the first recess 4 is always larger than a diameter or a corresponding diagonal of the first pin 2 in the region of the first recess 4. Thereby, there is a gap 5 between the first lateral surface 6 of the first Well 4 and arranged in this first pin 2. In this space 5 at least partially a solder material 7 is arranged, wherein it is preferably provided that substantially the entire bottom portion 8 of the first recess 4 is covered with the solder material 7. According to the invention it is further provided that the solder material 7 is at least partially disposed both on the first pin 2, and on the lateral surface 6, therefore liable. The preferably provided frustoconical or truncated pyramidal design of the first recess 4, the wetting is improved by the solder material 7, and provided a large surface for contact with the solder material 7.

The Fig. 1 to 3 show a first preferred embodiment of a Zündersockels 13, with an electrically conductive base body 14, a first contact pin 15 and a second contact pin 16, wherein the first contact pin 15 is electrically conductively connected to the base body 14, and wherein the second contact pin 16, from the main body 14th electrically insulated and gas-tight, is guided by the main body 14. The first contact pin 15 is connected to the main body 14 by means of a solder connection according to the invention. The first contact pin 15 corresponds to the first pin 2, and the main body 14 to the body. 1

The first contact pin 15, which is conductively connected to the main body 14, is preferably provided for the mass connection of the ignition base 13, whereas the second contact pin 16, which is electrically insulated from the main body 14, is intended for Power supply is provided.

The main body 14 has a substantially cylindrical disc-shaped basic shape, and is preferably formed comprising steel. The second contact pin 16 is guided through a passage opening of the main body 14, and electrically insulated from the base body 14 by means of a glass body 19, wherein the relevant compound is further designed to be gas-tight. Such compounds are also referred to as "glass to metal seal" GTMS short. It is preferably provided that the base body 14 is fused to the second contact pin 16 by means of the glass mass 19.

In the base body 14, the first recess 4 is arranged, in which the first contact pin 15 is held by a solder connection according to the invention, wherein - as preferably provided - substantially in the entire space 5 in the bottom portion 8 of the first recess 4, the solder material 7 is arranged.

In the embodiment according to the Fig. 1 to 3 the first recess 4 is formed as a blind hole. The first pin 2 or the first contact pin 15 is arranged in the blind hole 4. In this case, the ignition means facing side 17 of the ignition base 13 is unaffected by the solder joint. In particular, voltage peaks due to impurities on the surface on the side facing the ignition means 17 of the fuse base 13 can be avoided.

As in particular in the sectional view according to Fig. 3 can be seen, the recess 4 may be formed substantially frusto-conical. This shape allows a particularly reliable and secure embedding of the first contact pin 15. The first recess 4 may also be formed in a pyramidal shape. In other embodiments, a cylindrical shape may also be provided.

One end of the first pin 2 or the first contact pin 15 is arranged in the first recess 4 and soldered to the base body 14. In this case, the arranged in the recess 4 end of the first pin 2 and the first contact pin 15 may be formed rounded or sharpened. In this case, the first pin 2 and the first contact pin 15 after its production without further Machining be soldered securely.

The first pin 2 or first contact pin 15 is arranged substantially normal to the first surface 3. It is provided in particular that the first pin 2 or first contact pin 15 is arranged at least in the region of the solder joint normal to the first surface 3. As a result, the soldering process is improved because the formation of the solder meniscus is improved.

The 4 to 6 show an example of a fuze base 13, wherein the basic structure of the first preferred embodiment according to the Fig. 1 to 3 equivalent.

The base body 14 of this example also has a frustoconical first recess 4, wherein subsequently to the bottom portion 8 of the first recess 4, a receiving opening 9 is arranged. This receiving opening 9 has a substantially opposite to the first contact pin 15 cross section, wherein it is preferably provided that the receiving opening 9 has dimensions which allow insertion of the first contact pin 15 with a small clearance.

It can be provided that the receiving opening 9 is formed as a blind hole. However, as shown, it is preferably provided that the receiving opening 9 is formed as a through-hole, whereby a particularly good connection between the first contact pin 15 and the main body 14 can be achieved. As in particular in Fig. 6 can be seen, the first pin 2 and the first pin in the receiving opening 9 is arranged. By way of example, it is provided that in a gap 10 between a pin skirt surface 11 of the first pin 2 and a second lateral surface of the receiving opening 9 at least partially the solder material 7 is arranged. This can be dispensed with a complex Vorbelöten the first pin 2 and the first contact pin 15, whereby a further processing step can be saved. It is preferably provided that the gap 10 is substantially completely filled with the solder material.

It is preferably provided that the gap 10 has a width and a height which, in interaction with a certain solder material 7 and a specific processing temperature, results in the penetration of the solder material 7 into the gap 10 due to the capillary action. As a result, both the processing can be further simplified, and the safety of the solder joint can be increased, since the effective area of the solder joint is very large. As a result, the load capacity of the solder joint and the entire ignition base 13 can be improved. As a result, the security against destruction of the Zündersockels 13 - about when igniting the gas generator - be improved. The first pin 2 arranged in the receiving opening 9 penetrates the main body 14. In this example, both the first and the second contact pin 15, 16 terminate flush with the first side 17 of the main body 14. The planar surface on the first side 17 is preferably achieved by grinding the base body 14 after the solder joint has been produced. The use of rounded end pins is therefore not limited in this example.

The Fig. 7 to 9 show a further example of a fuze base 13 for a gas generator, the basic structure of the example according to the 4 to 6 equivalent.

In addition to a solder joint having a first recess 4 on the first surface 3 of the body 1, a second recess is further provided on the first side 17, with the use of a second solder joint is realized. Furthermore, the gap 10 is filled with solder 7. The ends of the two contact pins 15, 16 are unprocessed and have the production-related curves.

In the region of the first side 17 of the main body 14, the second recess forms at the edge of an annular elevation, which has a sharp edge. This preferably serves as a reservoir for a solder material 7, wherein it is preferably provided to abrade the edge and optionally the protruding parts of the first and / or second pin 2, 18 on the first side 17 in order to form a planar surface on the first side 17 ,

The 10 to 12 show a further example of a fuze base 13, wherein the basic structure of the example according to the 4 to 6 corresponds, wherein the first surface 3 is arranged on the first side 17, and project the ends of the two contact pins on this first surface 3. The solder joint is therefore arranged only on the first side 17 of the base body 14.

In another example, it is intended to abrade the protruding portions of the first and / or second pin 2, 18 on the first side 17 to form a planar surface on the first side 17.

Further examples have only a part of the described features, wherein each feature combination can be provided.

Claims (6)

1. An igniter base (13), comprising an electrically conductive base body (14), a first contact pin (15) and a second contact pin (16), wherein the first contact pin (15) is connected in an electrically conductive manner to the base body (14), and wherein the second contact pin (16), which is electrically insulated from the base body (14) and gas-tight, is guided through the base body (14), wherein the first contact pin (15) is connected to the base body (14) by means of a solder connection, wherein a first depression (4) is arranged in a first surface (3) of the base body (14), wherein a solder material (7) is arranged in an intermediate space (5) between a first jacket surface (6) of the first depression (4) and the first pin (2), wherein the solder material (7) is arranged at least in some sections both on the first pin (2) and also on the first jacket surface (6), characterized in that a rounded or pointed end of the first pin (2) is arranged in the first depression (4).
2. An igniter base (13) according to claim 1, characterized in that the first depression (4) is formed in the manner of a truncated cone or a truncated pyramid.
3. An igniter base (13) according to claim 1 or 2, characterized in that the first depression (4) is formed as a pocket hole.
4. An igniter base (13) according to one of the claims 1 to 3, characterized in that the first pin (2), at least in the region of the solder connection, is arranged substantially normal to the first surface (3).
5. An igniter base (13) according to one of the claims 1 to 4, characterized in that the solder material (7) is arranged substantially in the entire intermediate space (5) in the base region (8) of the first depression (4).
6. An igniter base (13) according to one of the claims 1 to 5, characterized in that the solder connection is arranged on a first side (17) of the base body (14) provided for producing an ignition spark.

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