WO2011066909A1 - Dispositif tendeur pour ceinture de sécurité - Google Patents

Dispositif tendeur pour ceinture de sécurité Download PDF

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Publication number
WO2011066909A1
WO2011066909A1 PCT/EP2010/007056 EP2010007056W WO2011066909A1 WO 2011066909 A1 WO2011066909 A1 WO 2011066909A1 EP 2010007056 W EP2010007056 W EP 2010007056W WO 2011066909 A1 WO2011066909 A1 WO 2011066909A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
opening
tensioner device
pressure
insert
Prior art date
Application number
PCT/EP2010/007056
Other languages
German (de)
English (en)
Inventor
Thomas Schmidt
Martin Schmidt
Christian Fischer
Michael Pech
Simone Mesecke-Rischmann
Matthias Steinberg
Tobias Voss
Original Assignee
Autoliv Development Ab
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 Autoliv Development Ab filed Critical Autoliv Development Ab
Publication of WO2011066909A1 publication Critical patent/WO2011066909A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
    • B60R22/4628—Reels with means to tension the belt in an emergency by forced winding up characterised by fluid actuators, e.g. pyrotechnic gas generators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
    • B60R22/4628—Reels with means to tension the belt in an emergency by forced winding up characterised by fluid actuators, e.g. pyrotechnic gas generators
    • B60R2022/4642—Reels with means to tension the belt in an emergency by forced winding up characterised by fluid actuators, e.g. pyrotechnic gas generators the gas directly propelling a flexible driving means, e.g. a plurality of successive masses, in a tubular chamber

Definitions

  • the invention relates to a pretensioner device for a safety belt, in particular in a motor vehicle, according to the preamble of claim 1.
  • a disadvantage of this solution is that the pressure is released to the outside out of the pipe, releasing a hot jet or even a jet of flame, which can damage adjacent parts.
  • the object of the invention is therefore to provide a Straffervortechnische with an overpressure protection, in which the risk of damage to adjacent parts of the tensioner device or the motor vehicle is avoided.
  • a Medfervoroplasty with the features of claim 1 is proposed. Further preferred embodiments of the invention can be found in the subclaims, the figures and the associated description.
  • the basic idea of the invention is to be seen in that the piston has on its side facing the pressure chamber a recess in which a piston penetrating opening is arranged, which is closed by an inserted into the recess insert, which at a predetermined pressure is exceeded in the pressure space in the region of the opening ruptures and the opening releases.
  • the advantage of the solution according to the invention is that the pressure relief valve is now arranged in the piston, so that the pressure is no longer released when opening the pressure relief valve in the environment, but through the piston into a region of the tube, which originally not through the Gas generator is pressurized, in which therefore a much lower pressure is present. A direct escape of the pressure, in particular a jet flame, in the environment with an associated risk of damage or a burn set adjacent parts is thereby avoided.
  • the pressure is released through the piston, so that at the same time the pressure on the other side of the piston is increased, and the driving pressure difference applied to the piston is reduced much faster. Due to the reduced driving pressure difference across the piston, the forces acting on the piston, the power transmission device and the belt shaft are also reduced faster than was possible with a pressure relief valve according to the prior art.
  • Fig.l To a belt retractor coupled Straffervorides with a piston guided in a tube;
  • Fig.2b piston with overpressure protection and one through a
  • the belt retractor shown schematically in FIG. 1 comprises a housing 11 with side legs 13, a belt winding shaft 12 mounted therein for a seatbelt, not shown, and a pretensioner 10 acting on the belt retracting shaft 12.
  • the pretensioner 10 includes a non-rotatable with the Gurtaufwickelwelle 12 connected drive wheel 14 having, for example, an external toothing 15, a particular pyrotechnic gas generator 17 for generating a gas pressure, and a gas generator 17 with the Gurtaufwickelwelle 12 via the drive wheel 14 connecting pipe 16.
  • the tube 16 is formed by a tube wall 24, the part of the housing 11 or alternatively may also be a separate component.
  • a number of particular metallic balls 19 for transmitting the gas pressure generated by the gas generator 17 is provided on the Gurtaufwickelwelle 12 via the drive wheel 14.
  • the belt retractor is in terms of the configuration of the interaction region 18 between the ball row 19 and the drive wheel 14 as well as any Kupplungssein- directions between the drive wheel 14 and the Gurtaufwickelwelle 12 not limited.
  • the outer diameter of the balls 19 is expediently slightly smaller than the inner diameter of the tube sixteenth
  • piston 21 is further provided, which is advantageously arranged in a region 23 between the gas generator 17 and the ball row 19, that is, immediately before the first ball in the transmission direction 19a ball row 19.
  • the piston 21 closes off a pressure chamber 20 which can be acted upon by the gas generator 17 with a gas pressure in the tube 16, so that the piston 21 can be driven to a tightening movement by the gas generator 17 when the pressure chamber 20 is pressurized.
  • the tightening movement of the piston 21 is transmitted to the belt take-up shaft 12 by the power transmission device constituted by the balls 19 and the drive wheel 14, so that the webbing is tightened.
  • the pretensioner device 10 has been described by way of example as applied to a belt retractor with a power transmission device comprising a series of mass bodies in the form of balls 19 and a drive wheel 14, but other types of power transmission devices are also conceivable. a rack or cable drive.
  • the invention is applicable in practice to all types of pretensioners whose drive comprises a piston-cylinder unit.
  • the pretensioner device can also be arranged on a belt lock or an end fitting.
  • the piston 21 can be seen in the tube 16 in an enlarged view.
  • the piston 21 delimits the pressure chamber 20 and rests against this with a corresponding to the shape of the first ball 19 a face 9.
  • the piston 21 is provided with a direction of the pressure chamber 20 directed sealing lip 22, which tapers towards its end and thus is flexible. Due to the flexibility of the sealing lip 22, the piston 21 can perform the tightening movement in a curved portion of the tube 16 without the piston 21 clamps.
  • the sealing lip 22 is thereby sealingly against even on deviations in shape or a changing cross-sectional shape of the tube 16 on the inside of the tube 16.
  • the sealing lip 22 expediently has a slightly larger outer diameter than the inner diameter of the tube 16, so that the sealing lip 22 rests after insertion of the piston 21 into the tube 16 with a spring bias on the inside of the tube 16.
  • an opening 1 is provided, which penetrates the piston 21 and in the subsequently explained in more detail open state connects the pressure chamber 20 with the in the direction S of the tensioning movement behind the piston 21 located space 25 in the tube 16.
  • the opening 1 is arranged in a cup-shaped recess 5 of the piston 21, in which a stiffening part 4 is inserted, which has a coaxial with the opening 1 in the piston 21 arranged opening 2.
  • the opening 2 in the stiffening part 4 has a smaller diameter D 2 than the diameter D 1 of the opening 1 in the piston 21.
  • the stiffening part 4 is also cup-shaped in the recess 8 in the engaging portion 8, wherein the recess 5 and the section 8 have an identical shape, so that the stiffening part 4 rests in the recess 5 on the circumference as possible on all sides.
  • an insert part 3 is provided, which closes the openings 1 and 2.
  • the insert 3 is likewise pot-shaped. forms and lies in the section 8 of the stiffening part 4 also on all sides.
  • the stiffening part 4 is provided with a collar 6, which engages in a recess 7 in the piston 21, and thereby additionally fixes the stiffening part 4 relative to the piston 21.
  • the stiffening part 4 additionally contributes in general to stiffening of the piston 21, in particular in the region of the sealing lip 22.
  • the insert 3 and the stiffening part 4 are preferably pressed together and in the recess 5, so that a total of a solid composite forms and the piston 21 can be arranged with the preassembled stiffening member 4 and the insert 3 in the tensioning device 10.
  • the insert 3 is deformed through the opening 2 and finally ruptures, so that the opening 1 is released and the pressure from the pressure chamber 20 in the region 25 of the tube 16 escape can.
  • the stiffening part 4 is preferably designed as a dimensionally stable metal part, so that the forces acting thereby are absorbed by the stiffening part 4 and do not lead to a deformation or destruction of the piston 21.
  • the stiffening member 4 causes the acting pressure forces on the insert 3 as possible lead exclusively to a deformation of the insert 3 in the region of the opening 2, and the tearing of the insert 3 is controlled as possible.
  • the diameter D2 of the opening 2 is smaller than the diameter Dl of the opening l, since the insert 3 is thereby deformed in the deformation around the edge of the opening 2 of the dimensionally stable stiffening member 4 and not around the edge of the Opening 1 of the piston 21.
  • the stiffening part 4 can be produced as a metal part in a stamping and bending process, which offers cost advantages, in particular for the production in large numbers.
  • the insert 3 can also be made as a metal part in a stamping and bending, preferably deep-drawing, or alternatively also in a die-cast aluminum or zinc. It is only important that the stiffening part 4 has a higher overall strength than the insert 3, which can be achieved either by a corresponding choice of material or by the design of the wall thickness or the shape.
  • the insert 3, in particular in the region arranged at the opening 2 weak points in the form of slits or thinner wall sections which promote the tearing in and also allow an accurate definition of the tear.
  • the advantage of the proposed solution is the fact that the overpressure is not discharged directly into the environment, but remains in the tube 16 at least in a first phase.
  • Another advantage of the invention lies in the fact that the overpressure protection created by the opening 1 is now realized directly on the piston 21, that is to say on the part which is decisive for the transmission of the tensioning movement.
  • the pressure applied to the overpressure protection is thus identical to the pressure which is the driving force of the tensioning movement, namely the pressure applied to the piston 21.
  • Another advantage of the invention lies in the fact that the pressure from the pressure chamber 20 is reduced by the escape of pressure to the other side of the piston 21, that is built on the opposite side of the piston 21, a back pressure is, and thereby the pressure applied to the piston 21 driving pressure difference is reduced very quickly. Due to the very quickly reduced driving pressure difference on the piston 21, the forces acting on the power transmission device and the subsequent parts are correspondingly reduced faster, and the risk of damage to these parts significantly reduced.
  • both parts form a very firm at least at the beginning of the opening process of the overpressure protection composite.
  • a recess 26 is provided in the end face 9 in the form of a channel extending radially outwardly from the opening 1. Through the recess 26, a flow connection is provided, through which the gas from the pressure chamber 20 can escape even in a voltage applied to the end face 9 first ball 19a in the tensioning direction behind the piston 21 located space 25.
  • a flow channel 28 which extends from the opening 1 through the piston 21 and opens at a location outside of the end face 9 exit point 27 into the space 25.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automotive Seat Belt Assembly (AREA)

Abstract

L'invention concerne un dispositif tendeur (10) pour une ceinture de sécurité, en particulier dans un véhicule automobile, ledit dispositif comprenant un générateur de gaz (17), un piston (21) guidé dans un tube (16) et fermant une chambre de pression (20) dans le tube (16) sollicité en pression par le générateur de gaz (17), ce qui permet au piston (21) d'être entraîné pour produire un mouvement de tension pouvant être transmis à la ceinture de sécurité au moyen d'un dispositif de transmission de force. Le piston (21) comprend sur son côté tourné vers la chambre de pression (20) un creux (5) dans lequel est ménagée une ouverture (11) traversant le piston (21) et fermée par une pièce d'insertion (3) insérée dans le creux (5), ladite pièce d'insertion s'ouvrant brusquement dans la zone de l'ouverture (1) et libérant cette dernière, lorsqu'une pression prédéfinie dans la chambre de pression (20) est dépassée.
PCT/EP2010/007056 2009-12-01 2010-11-22 Dispositif tendeur pour ceinture de sécurité WO2011066909A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009056244.3A DE102009056244B4 (de) 2009-12-01 2009-12-01 Straffervorrichtung für einen Sicherheitsgurt
DE102009056244.3 2009-12-01

Publications (1)

Publication Number Publication Date
WO2011066909A1 true WO2011066909A1 (fr) 2011-06-09

Family

ID=43608316

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/007056 WO2011066909A1 (fr) 2009-12-01 2010-11-22 Dispositif tendeur pour ceinture de sécurité

Country Status (2)

Country Link
DE (1) DE102009056244B4 (fr)
WO (1) WO2011066909A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111196243A (zh) * 2018-11-16 2020-05-26 延锋汽车智能安全系统有限责任公司 活塞、安全带卷收器和预紧式安全带

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3059127B1 (fr) * 2015-02-23 2018-10-03 Autoliv Development AB Tendeur de ceinture de sécurité
DE102015212317B4 (de) 2015-07-01 2019-10-10 Autoliv Development Ab Straffervorrichtung für einen Sicherheitsgurt

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19545795C1 (de) 1995-12-08 1997-03-20 Autoliv Dev Pyrotechnische Antriebsvorrichtung mit Überdrucksicherung
DE102008032371A1 (de) * 2008-03-06 2009-09-10 Trw Automotive Gmbh Gurtstraffer für ein Sicherheitsgurtsystem
WO2009124664A1 (fr) * 2008-04-09 2009-10-15 Autoliv Development Ab Dispositif pré-tensionneur pour une ceinture de sécurité

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10027212C2 (de) * 2000-05-31 2003-12-18 Breed Automotive Tech Vorrichtung zum Antrieb eines Sicherheitsgurtstraffers
DE20113773U1 (de) * 2001-08-20 2002-05-23 Trw Repa Gmbh Kolben für einen pyrotechnischen Gurtstraffer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19545795C1 (de) 1995-12-08 1997-03-20 Autoliv Dev Pyrotechnische Antriebsvorrichtung mit Überdrucksicherung
DE102008032371A1 (de) * 2008-03-06 2009-09-10 Trw Automotive Gmbh Gurtstraffer für ein Sicherheitsgurtsystem
WO2009124664A1 (fr) * 2008-04-09 2009-10-15 Autoliv Development Ab Dispositif pré-tensionneur pour une ceinture de sécurité

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111196243A (zh) * 2018-11-16 2020-05-26 延锋汽车智能安全系统有限责任公司 活塞、安全带卷收器和预紧式安全带

Also Published As

Publication number Publication date
DE102009056244A1 (de) 2011-06-09
DE102009056244B4 (de) 2015-10-29

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