WO2018010712A1 - Base body for an ignition capsule for occupant restraint systems - Google Patents

Abstract

The invention relates to a base body for an ignition capsule for occupant restraint systems in a motor vehicle, in particular for the gas generator of an inflatable impact protection cushion (airbag), wherein measures are taken to prevent an axial and radial movement of the glass insulation by the dissimilar material pairing of glass/metal and a lack of binding, in particular in unfavorable climate conditions and during the ignition process.

Description

 Basic body for a detonator for occupant restraint systems

 description

The invention relates to the basic body for a primer for the gas generator of an occupant restraint system in a motor vehicle. The most commonly used occupant restraint systems include the inflatable impact cushion (airbag) and the pretensioner. Both restraint systems require a gas generator whose propellant charge is exploded by a squib in the event of a vehicle collision. The amount of gas released thereby inflates the airbag or sets the turbine wheel of the belt tensioner in rotation.

Igniter caps for airbag inflators are known in the art.

In one embodiment, both pins are insulated with glass embedded in the body. In a further embodiment, only a single contact pin is insulated with glass embedded in the passage opening of the base body, wherein the second contact pin is welded to the base body.

US Pat. No. 6,274,252 B1, US 2002/00 69 781 A1, EP 1 455 160 B1, US Pat.

DE 10 2006 056 077 A1, DE 10 2007 001 640 A1, AT 51 3505 B1 describe basic bodies for primers, wherein the passage opening for receiving the glass insulation is circular in all of them. Measures to avoid a radial movement of the glass insulation are not recognizable. To avoid axial movement of the glass insulation, the implementation of conical, discontinued with

Projections or an undercut be formed.

In DE 103 48 944 B4, US 6, 877, 431 B2, US 2004/00 79 545 A1, JP 37 884 54 B2 basic body for primers are described, wherein in all the passage opening for receiving the glass insulation is formed oval, a radial Movement of the glass insulation is not possible. Measures to avoid axial movement of the glass insulation are not recognizable. From AT 513505 B1 a fuse base is known wherein the passage opening in the base body for receiving the glass insulation is circular and cylindrical. An increase in the pull-out force of the glass plug from the base body is achieved by deformation-induced structural transformation. Alternatively arises when punching the through hole in the body without a die on both end faces one

Deepening.

AT 513 905 A1

 It is described a Zündsockel for an airbag detonator with a

Glass bushing opening 21 for receiving a glass insulation 22 and a first contact pin 3, wherein a second passage opening 52 receives a second contact pin 4 without glass insulation is electrically connected to the main body 11 by means of soldering. The glass feedthrough opening 21 is cylindrical and has a circular punched cross section. Measures to avoid axial or radial movement of the glass insulation are not provided.

EP 1 457 758 A1

 The invention relates to a pyroelectric igniter with measures are provided for an axial movement of the contact pins 3 and the glass insert 2 at

To avoid ignition.

 The contact pins are squeezed at the level of the glaze 2 9. To increase the pushing force of the glass insert 2 from the capsule 1, the inside is provided with grooves 10.

The institute GWP of "Prof. Nicki "has found that in airbag detonators as in the Fraunhofer Airbag 2000 disclosed under" failure analysis lighter ", the uneven material pairing glass / metal may cause a gap between insulation and pin because of lack of bonding. (Www.Airbaq2000plus.de)

In the connection between insulation and body also the uneven material pair glass / metal is present.

The invention has for its object the at least one through hole in the body in such a way to both an axial and radial movement of the

Glass insulation, especially in unfavorable climatic conditions or during To avoid ignition.

The object is solved by the features of claim 1.

The invention will be explained in more detail below with reference to exemplary embodiments.

Fig. 1 shows schematically a section through the base body 1 according to the invention with the top view. The passage opening 4 shows at the top 2 of the base body 1, a slot 5 which ends by a conical course towards the bottom 3 circular 6.

Fig. 2 shows schematically a section through the base body 1 according to the invention with the top view. The passage opening 4 shows on the upper side 2 of the basic body 1 a multiple polygon 7 which ends in the conical course towards the lower side 3 in the partial area A, the area being circular up to the lower side 3.

Fig. 3 shows schematically a section through the base body 1 according to the invention with the top view. The passage opening 4 is a single conical

Bulge 8, 8a formed.

Fig. 4 shows schematically a section through the base body 1 according to the invention with the top view. The passage opening 4 shows on the upper side 2 of the main body 1 an oval 9 which ends in a conical shape towards the bottom 3 6 circular.

Claims

Patent claims 1. Base body (1) for a detonator for occupant restraint systems consisting of a circular disc made of weldable material a top (2) and a bottom (3) and with at least one through opening (4), where • the at least one through opening (4) on the top (2) is designed as an elongated hole (5) and • following a conical course • Ends in a circular shape (6) or as an elongated hole on the underside (3). 2. Base body (1) according to claim 1, characterized in that the at least one through opening (4) on the top (2) is designed as a multiple polygon (7) and after a conical taper on the bottom (3) is circular (6) or as Multiple poiygon ends with the edges rounded. 3. Base body (1) according to claim 1, characterized in that the at least one through opening (4) on the top (2) is designed as an oval (9) and ends after a conical course on the underside (3) in a circular shape (6) or as an oval 4. Base body (1) according to one of the preceding claims, characterized in that the through opening (4) has at least a single conical or axially parallel bulge (8, 8a) is formed, which ends after a partial area (A), the area being circular up to the underside (3).