EP3158279A1 - Compostant shunt et initiateur pyrotechnique associe - Google Patents
Compostant shunt et initiateur pyrotechnique associeInfo
- Publication number
- EP3158279A1 EP3158279A1 EP15729554.4A EP15729554A EP3158279A1 EP 3158279 A1 EP3158279 A1 EP 3158279A1 EP 15729554 A EP15729554 A EP 15729554A EP 3158279 A1 EP3158279 A1 EP 3158279A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shunt component
- conductive
- igniter
- shunt
- insulating body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B3/00—Blasting cartridges, i.e. case and explosive
- F42B3/10—Initiators therefor
- F42B3/18—Safety initiators resistant to premature firing by static electricity or stray currents
- F42B3/182—Safety initiators resistant to premature firing by static electricity or stray currents having shunting means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/70—Structural association with built-in electrical component with built-in switch
- H01R13/703—Structural association with built-in electrical component with built-in switch operated by engagement or disengagement of coupling parts, e.g. dual-continuity coupling part
- H01R13/7031—Shorting, shunting or bussing of different terminals interrupted or effected on engagement of coupling part, e.g. for ESD protection, line continuity
- H01R13/7032—Shorting, shunting or bussing of different terminals interrupted or effected on engagement of coupling part, e.g. for ESD protection, line continuity making use of a separate bridging element directly cooperating with the terminals
Definitions
- the technical field of the invention is that of the pyrotechnic initiators and 1 'invention more particularly relates to a shunt component and a pyrotechnic initiator comprising such a shunt component.
- the invention finds in particular an application for inflating devices of a vehicle safety cushion.
- Airbag Pyrotechnic devices, used in particular in inflators of air bags, commonly called “airbag” require to be accompanied, when installed on a vehicle, electrostatic protective devices.
- the seats when mounted on rails, the seats are more or less isolated from the frame by a layer of coating, paint, varnish and / or grease whose dielectric strength is of the order of a few hundreds of volts, which generates this risk of electrostatic discharge.
- a layer of coating, paint, varnish and / or grease whose dielectric strength is of the order of a few hundreds of volts, which generates this risk of electrostatic discharge.
- To limit the risk of electrostatic discharge shunt components have been provided to equip these pyrotechnic devices.
- a shunt component for a pyrotechnic initiator having a firing beam connector intended to be connected to a gas generator provided with a body and an igniter, particularly for an inflation device.
- cushioning device of a vehicle the shunt component comprising: - an insulating body having at least one opening, a side wall and a bottom defining together an interior space, the bottom being arranged to be traversed by two pins of the lighter in an assembled position; and a conductor element in the form of a conductive strip projecting towards the inside of the insulating body so that, in the assembled position, the conductive strip is in contact with the pins of the igniter.
- Such a shunt component is conventionally in the form of a ring having an insulating body of plastic material (s), the strip carried by the insulating body for shunting the pins of the igniter when Firing harness connector is in the disconnected position of the igniter. This is particularly the case when handling logistics and / or editing that requires such disconnection.
- Such a shunt component is for example disclosed in patent FR 2 807 155 B1.
- the conductive strip carried by the insulating body of the shunt ring and connected to it, is at a distance and positioned opposite the pins of the igniter.
- a disadvantage of such a device is that in this connected position, the conductive strip, forming a conductive element, is at a floating potential which promotes, especially in this type of application, a risk of electrostatic discharge.
- the object of the present invention is to enhance the immunity of pyrotechnic devices or initiators both in the disconnected and connected position of the pyrotechnic initiator.
- the device described below aims to remedy all or part of the disadvantages of the state of the art and in particular to achieve a simple and reliable shunt component removing any risk of unexpected electrostatic discharge and / or inadvertent.
- the subject of the invention is a shunt component for a pyrotechnic initiator comprising at least one gas generator provided with a body and an igniter, in particular for a device for inflating a safety cushion.
- the shunt component comprising: an insulating body having at least one opening, a side wall and a bottom defining together an interior space, the bottom being arranged to be traversed by at least two pins of the igniter in an assembled position; and a conductive member comprising a first conductive strip projecting inwardly of the insulative body so that, in the assembled position, the first conductive strip is in contact with the igniter pins;
- the shunt component being characterized in that it further comprises:
- a second conductive strip electrically connected to the first conductive strip, and protruding outwardly of its insulating body so that, in the assembled position, the second strip is in electrical contact with the body of the generator.
- shunt is understood to mean a resistance mounted in shunt on an apparatus for reducing the intensity of the current flowing therethrough.
- the conductive element has a predetermined resistance according to its intrinsic characteristics, in particular those (or) material (s) which constitutes it (s), which ensures the desired shunt.
- Such a shunt component intended to be inserted between the gas generator and a firing beam connector of the pyrotechnic initiator in a connected position of said pyrotechnic initiator, allows: first, to remove all risk of electrostatic discharge in a disconnected position, in particular during handling logistics and / or assembly, this thanks to the shunt performed, that is to say the branch connection of the first conductive strip; and on the other hand, to eliminate any risk of electrostatic discharge, particularly in the connected position since, by connecting the second conductive strip with the body of the gas generator, any floating potential is eliminated.
- the generator body is at least partly at least locally at the electrical contact, electrically conductive and generally metallic to provide the electrical connection to a mass of the vehicle.
- the first conductive strip in contact and in support against the pins of the igniter. This makes it possible to ensure improved electrical contact, in particular of bearing at any possible clearance, for example in case of wear of the parts or even in case of vibrations of the parts during the use of the vehicle.
- the conductive element is formed in one piece.
- first and second conductive lamellae together form a single piece which allows in particular to simplify the manufacture of the component and to improve the electrical conductivity between these two parts.
- the conductive element is housed substantially in a cavity of the side wall of the insulating body.
- the cavity is configured to maintain the conductive element fixed relative to the insulating body of the shunt component.
- the conductive element has substantially a shape of "Z".
- Such a shape "Z" allows on the one hand to facilitate assembly in the assembled position of the shunt component with the igniter and ensure a reliable connection. This is all the more advantageous when the conductive strips have a leaf spring elasticity so as to ensure electrical contact in abutment against the part to which it is in contact, in particular: against the pins with respect to the first conductive strip, in the assembled and disconnected position; and against the generator body with respect to the second conductive strip, in the assembled position of the shunt component, whether the igniter is in position connected or not with the firing beam connector.
- the invention also relates to a pyrotechnic initiator comprising at least one gas generator connected to a firing beam connector, in particular for a device for inflating a vehicle's safety cushion.
- the pyrotechnic initiator being characterized in that it comprises a shunt component as described above.
- Figure 1 is a perspective view of a shunt component according to an embodiment of the prior art
- Figure 2 is a longitudinal sectional view of a pyrotechnic initiator at its connection between a firing beam connector and a gas generator, in a connected position according to an embodiment of the prior art
- Figure 3 a simplified circuit diagram of the connection according to the embodiment of the prior art as shown in Figure 3;
- Figure 4 a detailed electrical diagram of the connection according to the embodiment of the prior art as illustrated in Figure 3;
- FIGS. 5A and 5B longitudinal sectional views of a pyrotechnic initiator at its connection between a firing beam connector and a gas generator, in a position respectively disconnected (FIG. 5A) and connected (FIG. 5B) according to one embodiment of the invention;
- FIGS. 6A and 6B transverse sectional views of the pyrotechnic initiator at its connection between the firing beam connector and the gas generator, in a position respectively disconnected (FIG. 6A) and connected (FIG. 6B); ) according to this same embodiment of the invention;
- FIG 7 a detailed electrical diagram of the connection according to the embodiment of the invention as illustrated in Figures 5A, 5B, 6A and 6B.
- FIGS. 1-4 illustrate a shunt component 1 and a portion of a pyrotechnic initiator 2 at its connection between a firing beam connector 23 and a gas generator 21 according to an embodiment of FIG. the prior art.
- FIG. 1 shows a perspective view of this shunt component 1 according to this embodiment of the prior art.
- This shunt component 1 is in the form of a ring and is intended to equip a pyrotechnic initiator 2 comprising a generator 21 of gas provided with a body 210 and an igniter 211, particularly as it is the case here for a device for inflating a vehicle's safety cushion, commonly called "airbag” in an Anglo-Saxon language.
- the shunt component 1 comprises in particular an insulating body 10 having an opening 101, a side wall 102 and a bottom 103 opposite the opening 101.
- the opening 101, the side wall 102 and the bottom 103 together define an interior space 104.
- the shunt component is adapted to be interposed between the gas generator 21 and a firing beam connector 23 of the pyrotechnic initiator 2 in a connected position of said pyrotechnic initiator.
- the body 210 of the gas generator 21 forms a "plug" type interface having a recess inside which pins 212 are erected.
- the connector 22 of the firing beam 23 presents it a "socket" type interface intended to cooperate with the "male” interface of the gas generator 21, the pins 212 being arranged to enter the beam 23 of the connector 22 (see Figure 2).
- the igniter 211 is a device (fuse) located in a flammable powder inside the gas generator 21 and connected to the pins 212.
- said firing beam 23 electrically connects a computer with the generator 21 of gas so that it can be controlled and thus be able to trigger the inflation of the security bag.
- the bottom 103 of the shunt component is arranged to be traversed by the pins. 212 of the igniter 211 in an assembled position, that is to say when said shunt component 1 is assembled with the generator 21 of gas, in particular forcibly placed in the recess of said gas generator 21.
- the opening 101 opposite the bottom 103, allows to receive the connector 22 of the beam 23 firing.
- the body 210 of the generator 21 thus forms a local support for the shunt component 1 at its connection interface.
- the shunt component 1 comprises a conductive element 11 formed here by two adjacent and protruding conductive lamellae 111 of the insulating body 10 so that, in the assembled position, said conductive lamellae 111 are each contact with the 212 pin of the igniter 211.
- the shunt component is overmoulded and thus isolated from the metal body of the igniter.
- each of the conductive strips is thus positioned opposite and at a distance from the pins 212 of the gas generator and the conductive element is at a distance of floating potential.
- FIG. 3 illustrates the equivalent electrical diagram in FIG. 3 (this FIG. illustrates the case where the slats are remote from the pins 212).
- the stray capacitance Co of the seat / driver assembly in a vehicle is of the order of 300 pF. This capacity is particularly responsible for friction at the seat / driver interface.
- the generator 21 of gas, mounted on the seat can be loaded at a relatively high potential compared to a mass m electric vehicle chassis.
- the conductive element of the shunt component is at a floating potential determined by the capacitive divider CI / C2 / C C PU, where:
- Ci and C2 are the parasitic capacitances of the conductive element 11 respectively with respect to the body 210 of the gas generator 21 (Ci) and with respect to the pin 212 (C 2 );
- C C pu is the protection capacity of a central unit of the controller (not shown in the figures) connected to the firing beam 23.
- an end of the conductive strip 111 forming a conductive element 11 disposed opposite the pin 212 represents a point of local reinforcement of the electric field.
- the capacitance Ci is substantially equal to the capacitance C2 and that these capacitances are negligible with respect to the capacitance C C, which is itself equal to approximately 200nF
- the difference of the potential between the pin 212 and the conductive strip 111 is about 1 ⁇ 2 Vo (see FIG. 4).
- the leakage current via a corona R D p between the end of the lamella 111 and conductive pin 212 is limited by the capacitance C 2 and therefore remains extremely low, ie of the order of 10 ⁇ 10 A.
- the letters "DP”, meaning "partial discharge”, here designate the zone where instead the electrostatic discharge.
- the present invention relates to a device limiting the voltage Vo and therefore limiting the energy required for the electrostatic discharge of the igniter.
- the shunt component 1 is provided according to the invention of a second conductive strip 112, in addition to the first conductive strip 111 described herein. -before.
- This second conductive strip 112 is electrically connected to the first conductive strip 211, and protruding outwardly from its insulating body 10 so that, in the assembled position, the second conductive strip 112 is placed in contact with the body 210 of the generator 21.
- a partial discharge DP whose current is no longer limited by the capacitance Ci now short-circuited is formed between the end of the first conductive strip 112 of the conductive element 11 and the pin 212.
- the appearance voltage of the partial discharge DP in the air depends only on the radius of the tip of the end of the first conductive strip 112 of the conductive element 11.
- the radius of curvature of the end of the first conductive strip 112 of the conductive element 1 at the point where the contact takes place with the pin 212 is of the order of 100 ms. Because of the local enhancement of the electric field, the ionizing activity around this end already begins at a relatively low voltage, of the order of a few hundred volts only.
- the resistance R D p is inversely proportional to the voltage Vo, thus the leakage current increases with the voltage taken at the electrostatic potential P e .
- the energy stored therein begins to drain via the partial discharge zone DP and the firing beam 23, without ever reaching the trigger threshold of the igniter, which is in this example of the order of 0.67mJ.
- FIGS. 5A and 5B illustrate such a pyrotechnic initiator 2 at its connection between the connector 22 of the firing beam 23 and the gas generator 21, in a respectively disconnected (FIG. 5A) and connected (FIG. 5B), in longitudinal sectional views of the pyrotechnic initiator 2, that is to say in the direction of the connection.
- FIGS. 6A and 6B illustrate transverse sectional views in a plane orthogonal to the longitudinal axis of the pyrotechnic initiator 2.
- the first conductive strip 111 is placed in electrical contact against the pin 212 passing through the bottom 103 of the shunt component 1 and penetrating into the interior space 104.
- the conductive element 11 is formed in one piece.
- the first and second conductive strips 111, 112 are here formed in the same metal part.
- Such a conductive element 11 is simple to manufacture, inexpensive and the electrical conduction between these two strips is of course optimal.
- the conductive element 11 is housed substantially in a cavity 1020 of the side wall 102 of the insulating body 10.
- This cavity 1020 has a central space 1021 extending longitudinally relative to the side wall, this central space 1021: opening on the one hand, via an inner opening 1022 to the inner space 104 of the shunt component 1 formed by its insulating body 10; and opening on the other hand, via an outer opening 1023, offset longitudinally with the inner opening 1022, outwards with respect to the insulating body 10.
- the conductive element 11 has substantially a shape of "Z" oriented opening 101 to the bottom 103 of the shunt component. Thanks to this configuration and from the material (s) constituting (s), the first and second conductive strips 111, 112 have a certain elasticity so that, when they are placed in an electrical contact position , with pin 212 or body 210 of the gas generator 21 according to the associated conductive strip, they can deform elastically and be subjected to a stress that allows them to exert a bearing force against said pin 212 or said body 210 still in said associated conductive strip.
- the inner opening 1022 is adjacent to the opening 101 of the insulating body 10 and the outer opening 1023, longitudinally offset is closer to the bottom 103 than is the inner opening 1022.
- longitudinally offset is closer to the bottom 103 than is the inner opening 1022.
- the cavity 1020 and the conductive element 11 are dimensioned so that said conductive element 11 is held without play in the cavity 1020 in the inserted position of the conductive element 11 in the insulating body 10.
- the first conductive strip 111 ensures its shunt function. electrical being positioned in contact and bearing against pin 212.
- the second conductive strip 112 is placed in contact and bearing against the body 210 metallic generator 210.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Air Bags (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1455670A FR3022620B1 (fr) | 2014-06-19 | 2014-06-19 | Composant shunt et initiateur pyrotechnique associe |
| PCT/FR2015/051462 WO2015193576A1 (fr) | 2014-06-19 | 2015-06-03 | Compostant shunt et initiateur pyrotechnique associe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3158279A1 true EP3158279A1 (fr) | 2017-04-26 |
| EP3158279B1 EP3158279B1 (fr) | 2018-01-24 |
Family
ID=51726641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP15729554.4A Not-in-force EP3158279B1 (fr) | 2014-06-19 | 2015-06-03 | Composant shunt et initiateur pyrotechnique associe |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3158279B1 (fr) |
| FR (1) | FR3022620B1 (fr) |
| MA (1) | MA39716A (fr) |
| WO (1) | WO2015193576A1 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3407438A1 (fr) * | 2017-05-22 | 2018-11-28 | MBDA Deutschland GmbH | Système de connecteur enfichable destiné au contact protégé contre l'allumage, protégé électriquement avec une perle d'allumage |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19935969C2 (de) * | 1999-07-30 | 2001-12-13 | Framatome Connectors Int | Kurzschluß-Kontaktträger für Zündersockel |
| FR2807155B1 (fr) * | 2000-03-30 | 2003-03-21 | Giat Ind Sa | Initiateur pyrotechnique pouvant etre equipe d'un composant electrique ou electronique et/ou d'un connecteur |
| JP3679322B2 (ja) * | 2000-08-31 | 2005-08-03 | 日本圧着端子製造株式会社 | スクイブのシャント |
| US20040043652A1 (en) * | 2002-08-30 | 2004-03-04 | Special Devices, Inc. | Initiator having integral features for orienting and holding an insertable electrical shunt |
| US20040112244A1 (en) * | 2002-12-11 | 2004-06-17 | Kent Barker | Initiator assembly with integrated shorting element |
-
2014
- 2014-06-19 FR FR1455670A patent/FR3022620B1/fr not_active Expired - Fee Related
-
2015
- 2015-06-02 MA MA039716A patent/MA39716A/fr unknown
- 2015-06-03 EP EP15729554.4A patent/EP3158279B1/fr not_active Not-in-force
- 2015-06-03 WO PCT/FR2015/051462 patent/WO2015193576A1/fr not_active Ceased
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3407438A1 (fr) * | 2017-05-22 | 2018-11-28 | MBDA Deutschland GmbH | Système de connecteur enfichable destiné au contact protégé contre l'allumage, protégé électriquement avec une perle d'allumage |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2015193576A1 (fr) | 2015-12-23 |
| EP3158279B1 (fr) | 2018-01-24 |
| MA39716A (fr) | 2018-01-23 |
| FR3022620A1 (fr) | 2015-12-25 |
| FR3022620B1 (fr) | 2016-06-03 |
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