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WO1996034780A1 - Sac a gaz - Google Patents

Sac a gaz Download PDF

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Publication number
WO1996034780A1
WO1996034780A1 PCT/DE1996/000343 DE9600343W WO9634780A1 WO 1996034780 A1 WO1996034780 A1 WO 1996034780A1 DE 9600343 W DE9600343 W DE 9600343W WO 9634780 A1 WO9634780 A1 WO 9634780A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
airbag
outflow opening
gas bag
slot
Prior art date
Application number
PCT/DE1996/000343
Other languages
German (de)
English (en)
Inventor
Heinz-Dieter Adomeit
Thomas Marotzke
Original Assignee
Petri Ag
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Petri Ag filed Critical Petri Ag
Publication of WO1996034780A1 publication Critical patent/WO1996034780A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23—Inflatable members
    • B60R21/239—Inflatable members characterised by their venting means

Definitions

  • the invention relates to an airbag according to the preamble of claim 1.
  • gas-permeable fabric for the gas bag or to provide gas discharge openings when using gas-impermeable fabric.
  • These gas discharge openings generally have a circular cross section.
  • a gas outflow opening is formed by providing two or more, preferably four, circular openings of small diameter arranged crosswise at a distance from one another in the wall of the impact cushion, and these openings through narrow gaps separating the cushion wall in this way are connected to each other that flaps are formed in the cushion wall, which can swing freely. These flaps are folded outwards under the pressure in the gas bag and thus enlarge the outflow openings at higher pressure in the gas bag.
  • the invention is therefore based on the object of changing the damping characteristic of the gas bag in the event of a crash so that the "braking effect" of the gas bag occurs on a larger gas bag thickness and that the load on the occupant is reduced.
  • a straight slot is provided as the gas outflow opening, which preferably runs in the direction of the warp threads or the weft threads of the fabric. It has been shown that the outflow behavior of the gas bag can be controlled in a load-dependent manner with this simple gas outflow opening according to the invention.
  • the loading of the fabric threads running in the direction of the slot holds the two sides of the slot together, so that initially no gas or only a small amount of gas can flow out of the gas bag.
  • the slot is widened so that gas can now flow out of the airbag.
  • the damping characteristic is controlled in the event of an increased load on the gas bag in such a way that a delay without a remarkable peak value is caused.
  • the deceleration force over the deceleration path is approximated to a rectangular value, as a result of which the load on the occupant in the event of a crash is reduced.
  • the slit-shaped gas outflow opening runs between two warp threads. In this embodiment, therefore, none of the warp threads are cut, so that the strength of the fabric in the warp direction is not impaired.
  • the slot-shaped gas outflow opening has extensions at its ends, which are preferably circular. These serve to relieve tension and are intended to prevent the slot from tearing open.
  • the fabric can also have a reinforcement in the area of the gas outflow opening.
  • the gas outflow opening is overlapped by a fold of the gas bag which is fastened to the gas bag fabric with at least one tear seam.
  • the start of the gas outflow from the gas bag can be further delayed.
  • the fold initially completely covers the gas outflow opening until a predetermined value of the load is reached, at which the tear seams tear and the fold is smoothed due to the internal pressure in the gas bag.
  • the gas outflow opening is opened and, as already described, also opens increasingly as the load on the gas bag increases.
  • a cover attached to the gas bag fabric by means of tear threads is provided in the gas bag above the gas outflow opening. This cover is preferably arranged inside the gas bag.
  • the gas outflow opening is preferably circular and the cover preferably has a triangular shape.
  • the start of the gas outflow can be delayed.
  • the tears break.
  • the cover is first pressed against the gas bag fabric in sections that overlap the gas outflow opening.
  • the gas outflow opening is initially closed. Only after a certain pressure is exceeded the tears break and the friction mentioned is overcome. Then the cover is pushed outwards and the gas discharge opening is opened.
  • the gas bag has at least one outflow opening which is closed by at least one tear seam in the gas bag which is not inflated.
  • This tear seam is preferably designed as a zigzag seam. In this embodiment, the tear seam suddenly releases the outflow opening when the voltage rises, so that this also prevents excessive stress on the occupant when it comes into contact with the gas bag.
  • 1 shows an inflated gas bag with the slit-shaped gas outflow opening according to the invention
  • 2a shows the position of a gas outflow opening with a straight slot in the tissue
  • FIG. 3 shows a gas outflow opening according to FIG. 2 with reinforcement
  • Fig. 5 is a view of the embodiment of Fig. 4;
  • FIG. 6 shows a diagram with the course of the deceleration force over the deceleration path.
  • the diagram in FIG. 6 shows how the deceleration force runs over the deceleration path in a known gas bag with one outflow opening or several outflow openings of constant size and in an air bag according to the invention. From curve a, which relates to known versions of an airbag, it can be seen that the deceleration force only takes effect gradually and then rises steeply to a peak value. This peak value of the decelerating force greatly affects the occupant claimed.
  • the area under curve b corresponds to the kinetic energy of the occupant.
  • FIG. 1 shows an inflated gas bag 1 with a slit-shaped gas outflow opening 2.
  • FIG. 2a shows the preferred arrangement of the slot of the gas outflow opening in the fabric 3 of the gas bag. It can be seen that the slot runs in the direction of the warp threads 11 and has circular extensions 12 at its ends, which prevent the slot from tearing under load. Tearing out can additionally be prevented by providing a fabric reinforcement 4 (FIG. 3) in the area of the slot.
  • the gas outflow opening 2 runs between two warp threads, i.e. no warp thread is damaged by the slot. This eliminates the need for a hole-shaped widening or reinforcement at the ends of the slot.
  • the slot-shaped gas outflow opening 2 maintains the shape shown in FIG. 2a during the inflation of the gas bag and also after the inflation in the absence of an external load, or the sides of the slot even move towards one another during inflation and narrow the slot. This is particularly the case if the slot, as in FIG. 2a, runs in the direction of the warp threads.
  • the gas bag in the inflated state, in the absence of an external load, the gas bag has a gas discharge opening with a small cross section.
  • the gas outflow openings are initially closed.
  • the slot width increases with increasing load, the increase initially being small, so that the deceleration force on the occupant initially rises sharply until the outflow opening opens at point ⁇ , as can be seen from curve a in FIG. 6.
  • the airbag builds a load-bearing cushion earlier, even at a low relative speed of the occupant.
  • the increasingly widening slot causes an increasingly stronger gas flow through the slot, so that the decelerating force remains almost constant with increasing occupant deceleration distance, as can also be seen from curve a in FIG. 6.
  • the peak deceleration of curve b no longer occurs, but the deceleration curve approximates a rectangular shape.
  • the areas under curves a and b are the same and correspond to the motion energy of the occupant.
  • the gas bag has a fold 6 in the collapsed state in the area of the slot-shaped gas outflow opening 2, which fold covers the slot.
  • This fold 6 is attached to the opposite fabric of the gas bag by means of a tear seam 5.
  • the slit-shaped gas outflow opening 2 is thus closed.
  • the tear seam 5 only releases the gas outflow opening 2 at a predetermined internal pressure and thus a certain tissue tension. The start of the outflow of the gas from the inflating or inflated gas bag can thus be postponed further in time, so that an even closer approximation of the deceleration characteristic to the rectangular shape is achieved.
  • an outflow opening 10 is provided in the gas bag 7.
  • a cover 8 which is preferably arranged in the interior of the gas bag 7.
  • it is triangular and has rounded corners, to which it is attached to the gas bag 7 by means of tear threads 9.
  • the beginning of the outflow of the gas from the inflating or inflated airbag is also postponed further in this embodiment, so that the deceleration characteristic is more closely approximated to the rectangular shape.
  • the cover 8 is placed under the internal pressure when the gas bag is inflated, so that the hatched area in FIG. 7 is present as a sealing surface.
  • the tearing threads 9 only break at a predetermined internal pressure, so that the cover 8 is pressed outward through the outflow opening 10 and gas can escape to the outside through the outflow opening.
  • a slit-shaped outflow opening 14 is provided, which is initially closed by a tear seam 15.
  • the tear seam 15 can have the zigzag-shaped course shown in FIG. 8, but a different seam shape can also be selected. The tear seam suddenly releases the outflow opening 14 when the voltage rises.
  • an oval elongated outflow opening 16 is provided, which is closed in the non-inflated state of the gas bag by pulling the opening together in the direction of the arrow and then sewing it as in FIG. 8.
  • Such a tear seam tears open more easily, since the tensions in the area of the opening are only absorbed by the tear seam.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Bags (AREA)

Abstract

L'invention concerne un sac à gaz comportant au moins une ouverture d'échappement du gaz pour un module d'airbag. Conformément à l'invention, le sac à gaz présente une fente (2) comme ouverture d'échappement du gaz. L'avantage du dispositif selon l'invention réside dans le fait que les caractéristiques d'amortissement du sac à gaz, en cas de collision, sont modifiées de telle façon que l''effet de freinage' du sac à gaz s'exerce sur une plus grande épaisseur du sac et que la charge sur le passager est réduite.
PCT/DE1996/000343 1995-05-04 1996-02-22 Sac a gaz WO1996034780A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1995117315 DE19517315C2 (de) 1995-05-04 1995-05-04 Gassack
DE19517315.5 1995-05-04

Publications (1)

Publication Number Publication Date
WO1996034780A1 true WO1996034780A1 (fr) 1996-11-07

Family

ID=7761671

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1996/000343 WO1996034780A1 (fr) 1995-05-04 1996-02-22 Sac a gaz

Country Status (2)

Country Link
DE (1) DE19517315C2 (fr)
WO (1) WO1996034780A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6672597B1 (en) * 1999-09-17 2004-01-06 Illbruck Gmbh Sealing strip for sealing a joint
GB2400355A (en) * 2003-04-10 2004-10-13 Autoliv Dev Air-bag with vent hole

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1228740A (zh) * 1996-06-28 1999-09-15 精密结构集团有限公司 具有非圆形排气孔的气囊
FR2767100A1 (fr) * 1997-08-05 1999-02-12 Victor Raievski Dispositif pour ameliorer les performances d'un airbag a compartiments multiples communicants
DE19859767B4 (de) * 1998-12-23 2005-09-29 Autoliv Development Ab Gassack mit Abströmöffnung
DE102004049513A1 (de) * 2004-10-11 2006-04-20 Trw Automotive Gmbh Gassack mit Abströmöffnung
DE102004058438B3 (de) * 2004-12-03 2006-05-11 Trw Automotive Gmbh Gassack für ein Fahrzeuginsassen-Rückhaltesystem
DE102004063234A1 (de) * 2004-12-29 2006-07-20 Trw Automotive Gmbh Gassack mit Abströmöffnung
DE102006027371A1 (de) * 2006-06-13 2007-12-20 Trw Automotive Gmbh Aufblasbarer Gassack sowie Gassackmodul mit einem solchen Gassack
DE102008018857B3 (de) * 2008-04-15 2009-07-16 Autoliv Development Ab Gassack
DE102009018159A1 (de) * 2009-04-21 2010-11-04 Autoliv Development Ab Gassackmodul mit einem eine adaptive Ventilationsöffnung aufweisenden Gassack
BR112013016506A2 (pt) * 2011-01-20 2016-09-27 Honda Motor Co Ltd aparelho airbag
DE102012000289B4 (de) * 2012-01-10 2017-10-19 Autoliv Development Ab Airbag
US8882143B2 (en) 2013-02-08 2014-11-11 Autoliv Asp, Inc. Airbag with slit vent
US10093270B2 (en) 2016-01-13 2018-10-09 Autoliv Asp, Inc. Multi-flap vents for inflatable chambers
US11292423B2 (en) 2020-05-18 2022-04-05 Autoliv Asp, Inc. Vent flap for airbag assemblies

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3879057A (en) * 1972-02-28 1975-04-22 Toyoda Boshoku Kk Safety gas bag structure
DE2542764A1 (de) * 1975-09-25 1977-04-07 Volkswagenwerk Ag Sicherheitseinrichtung fuer fahrzeuge, insbesondere kraftfahrzeuge
US4181325A (en) * 1978-03-06 1980-01-01 General Motors Corporation Occupant restraint cushion
JPH06286569A (ja) * 1993-03-30 1994-10-11 Hino Motors Ltd 車両用のエアバッグシステム
JPH06286568A (ja) * 1993-03-30 1994-10-11 Hino Motors Ltd 車両用のエアバッグシステム

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3618060A1 (de) * 1986-05-28 1987-12-03 Bayerische Motoren Werke Ag Gaskissen zum schutz der insassen von fahrzeugen
JPH0644759Y2 (ja) * 1986-08-26 1994-11-16 タカタ株式会社 エアバッグの圧力調節装置
WO1991018763A1 (fr) * 1990-05-30 1991-12-12 Takata Kabushiki Kaisha Coussin pneumatique gonflable pour installation de securite anti-collision
DE4101287A1 (de) * 1991-01-17 1992-07-30 Trw Repa Gmbh Aufblasbarer gassack fuer ein rueckhaltesystem in fahrzeugen
DE4306615A1 (de) * 1993-03-03 1994-09-08 Joachim Dipl Ing Aigner Aufprallrückhaltesystem für Insassen von Kraftfahrzeugen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3879057A (en) * 1972-02-28 1975-04-22 Toyoda Boshoku Kk Safety gas bag structure
DE2542764A1 (de) * 1975-09-25 1977-04-07 Volkswagenwerk Ag Sicherheitseinrichtung fuer fahrzeuge, insbesondere kraftfahrzeuge
US4181325A (en) * 1978-03-06 1980-01-01 General Motors Corporation Occupant restraint cushion
JPH06286569A (ja) * 1993-03-30 1994-10-11 Hino Motors Ltd 車両用のエアバッグシステム
JPH06286568A (ja) * 1993-03-30 1994-10-11 Hino Motors Ltd 車両用のエアバッグシステム

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 94, no. 010 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6672597B1 (en) * 1999-09-17 2004-01-06 Illbruck Gmbh Sealing strip for sealing a joint
GB2400355A (en) * 2003-04-10 2004-10-13 Autoliv Dev Air-bag with vent hole
GB2400355B (en) * 2003-04-10 2006-05-24 Autoliv Dev Improvements in or relating to an air-bag
US7118127B2 (en) 2003-04-10 2006-10-10 Autoliv Development Ab Air-bags

Also Published As

Publication number Publication date
DE19517315A1 (de) 1996-11-07
DE19517315C2 (de) 2003-04-17

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