WO2009124664A1 - Dispositif pré-tensionneur pour une ceinture de sécurité - Google Patents

Dispositif pré-tensionneur pour une ceinture de sécurité Download PDF

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Publication number
WO2009124664A1
WO2009124664A1 PCT/EP2009/002258 EP2009002258W WO2009124664A1 WO 2009124664 A1 WO2009124664 A1 WO 2009124664A1 EP 2009002258 W EP2009002258 W EP 2009002258W WO 2009124664 A1 WO2009124664 A1 WO 2009124664A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
valve element
channel
pretensioner
valve
Prior art date
Application number
PCT/EP2009/002258
Other languages
German (de)
English (en)
Inventor
Ronald Jabusch
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 WO2009124664A1 publication Critical patent/WO2009124664A1/fr

Links

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
    • 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
    • B60R2022/4661—Reels with means to tension the belt in an emergency by forced winding up characterised by fluid actuators, e.g. pyrotechnic gas generators comprising venting means, e.g. for avoiding overpressure in case of fire or for allowing return motion with energy absorption

Definitions

  • the invention relates to a tightening device for a safety belt, in particular in a motor vehicle.
  • a tightening device according to the preamble of claim 1 is known from DE 195 12 660 C2.
  • US Pat. No. 6,345,504 B1 discloses a tightening device according to the preamble of claim 1, wherein between the gas generator and a row of metal balls forming the force transmission device a piston element in the form of a plastic ball sealing the channel sealingly is provided.
  • a blind hole and in the subsequent metal ball a through hole is made.
  • a rod of a material that is harder than the plastic ball extends through the blind hole and the through hole.
  • the rod causes the plastic ball to rupture to allow the gas to escape through the channel.
  • the bursting process can not be controlled exactly, so that the nominal bursting pressure can not be set exactly reproducible.
  • a ruptured plastic ball reliable pressure build-up is no longer possible and therefore ultimately endanger the reliability of the pretensioner device.
  • DE 10 2005 029 032 A1 discloses a non-generic pretensioner device with a piston which is coupled to a tensioning element, by means of which the seat belt is tightened during a displacement of the piston caused by the combustion of a propellant charge.
  • WO 2006 045727 A1 discloses a gas generator for inflating an airbag with a prestressed piston arranged displaceably in a diffusion chamber for opening or closing an opening between a combustion chamber and the diffusion chamber.
  • the object of the invention is to provide a compact and functionally reliable tightening device with sufficient tightening power, in which the escape of gases into the environment is avoided.
  • the invention solves this problem by the displaceable piston element in the channel forms a valve.
  • the piston element has a pretensioned valve element which releases a passage through the piston element when a certain gas pressure is exceeded.
  • the pressure level at which the valve opens can be set exactly.
  • the gas can flow through the channel to reduce the overpressure, without gas escaping into the environment. Therefore, due to the invention occur no more overpressures in the tightening device.
  • the valve element has an input-side, relative to the diameter of the valve element relatively small first piston surface. It is then a relatively high pressure required to open the valve without the bias generating element must be large dimensions.
  • a second larger piston surface is provided subsequently, ie downstream of the first active surface.
  • This stepped structure has the advantage that the valve opens substantially abruptly after opening the input-side valve stage, because the gas pressure on the larger second effective area generates a considerably greater force to overcome the bias voltage.
  • FIG. 1 shows a schematic cross-sectional view of a Gurtaufwi- ckelhim in the region of the tightening device
  • FIG. 2 is a cross-sectional view of a tightening device in FIG Area of the piston element
  • FIG. 3 a detail view of FIG. 2 with the valve element open;
  • FIG. 4 shows a detailed view of FIG. 2 with the valve element closed
  • FIG. 5 shows a cross-sectional view of a tightening device in the region of the piston element in another embodiment
  • FIG. 6 shows a detailed cross-sectional view of a piston element in another embodiment with the valve element open.
  • Fig. 7 is a detail cross-sectional view of FIG. 6 with the valve element closed.
  • 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, which has, 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 Denden channel 16.
  • the channel 16 is formed by a channel wall 24, the Part of the housing 11 or alternatively may 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 not limited in terms of the design of the interaction region 18 between the ball row 19 and the drive wheel and any coupling devices between the drive wheel 14 and the belt take-up shaft 12.
  • the outer diameter of the metal balls 19 is expediently somewhat smaller than the inner diameter of the channel 16, as can be seen from FIGS. 2 and 5.
  • piston element 21 is further arranged, which is at least partially elastic and has an excess with respect to the channel 16 to seal the channel 16.
  • the piston member 21 thus serves to prevent power loss due to gas flowing past the balls 19.
  • the piston element 21 is expediently arranged in a region 23 between the gas generator 17 and the balls 19, that is to say directly in front of the first ball 19a in the direction of transmission of force, but this is not necessarily the case.
  • FIG. 21 An embodiment of the piston element 21 is shown in FIG. It comprises an elongated, dimensionally stable body 25, for example made of metal or plastic, and an elastic sealing element 22 for sealing the channel 16.
  • Oblong means that the axial extent of the piston element 21 is greater than the inner diameter of the channel 16, preferably at least 1, 5 times.
  • the piston member 21 is substantially formed by two bulbous, separated by an annular constriction 28 segments 26, 27. This shaping of the piston member 21 provides a reduced friction the piston member 21 in curved portions of the channel 16th
  • the piston element 21 has a bore 29 with an inlet opening 33 in the flow direction in front of the sealing element 22 and an outlet opening 36 in the flow direction downstream of the sealing element 22.
  • An inlet opening facing away from the end of the bore 29 may be closed, for example by means of a screw 30.
  • the outlet opening 36 is here formed by a lateral channel, but it may also be embodied in other ways, for example as a bore through the screw 30.
  • a valve member 31 is arranged axially displaceable relative to the piston member 21.
  • the valve element 31 is biased by means of a biasing element 32, which is designed here as a spring, so that it closes the inlet opening 33 in the pressureless state.
  • the cone-shaped tip 34 of the valve element 31 is pressed against a corresponding sealing surface 35 of the piston element 21, so that a seal is formed here.
  • the biasing element 32 causes the closing of the valve, so that the gas pressure again acts on the piston element 21 substantially without loss.
  • the period of time in which the gas pressure is reduced by bypassing the sealing element 22 by the piston element 21 is thus limited to the presence of the overpressure.
  • the diameter dl of the input-side opening is small, preferably at most half as large, compared to the diameter of the valve element 31 and the inner diameter D 20 of the bore 29. It is therefore a relatively high pressure adjustable at which the valve should open, without that the biasing member 32 must be particularly large dimensions.
  • FIGS. 3, 25 and 4 A further advantageous embodiment is shown in FIGS. 3, 25 and 4.
  • the piston member 21 forms with the bore 29 with the valve closed a subsequent, that is, downstream of the first sealing surface 35 arranged second sealing surface 37, as shown in Fig. 4.
  • the piston element 21 in particular a cylindrical, 30 the inner diameter of the bore 29 corresponding piston portion 38.
  • the diameter d2 of the downstream piston surface is preferably larger, in particular at least by a factor of 1.5, more preferably at least by the factor tor 2, as the diameter dl of the input-side piston surface.
  • valve element 31 When the valve element 31 opens as a result of an overpressure, initially no passage through the piston element 21 is released, but the gas flows into a chamber 39 formed between the sealing surfaces 35 and 37, which is still sealed by the second sealing surface 37. Due to the significantly larger downstream piston surface, the gas pressure generates a significantly increased force on the valve element 31, which leads to a considerably accelerated displacement of the valve body 31, until finally the open state shown in FIG. 3 is reached, in which the passage through the valve body 31 is released.
  • the downstream larger sealing surface 37 therefore causes a substantially sudden opening of the valve, allowing a faster and defined reduction of the overpressure.
  • the valve element 31 is designed as a solid body with a head part 40 and an elongate shaft part 41 running inside the helical spring 32. Due to the high mass of the valve element 31, a sudden over-pressure on the gas generator side is required in a sudden stopping of the piston member 21 in the channel 16, in particular at the end of the tightening process, due to the inertia of the valve member 31 to open the valve. As a result, force peaks are reduced in particular when reversing the tensioning device 10. This is advantageous since, especially at the end of the tightening process, a rapid pressure reduction on the gas generator side is desired, in particular in order to facilitate the initiation of a countermovement.
  • valve element 31 does not have to be designed as an elongate plunger.
  • it is a simple ball as a valve element 31.
  • the sealing surface 35 is then expediently adapted to the spherical shape.
  • the valve element 31 has a pin-shaped portion 40 for forming the input-side seal, the diameter of which is matched to the input-side opening 33 with a precise fit.
  • the valve opens only when a predetermined pressure level is exceeded for a certain period of time, which is sufficiently long to push the cylindrical portion 40 completely out of the inlet opening 33. This ensures that the valve does not open even at short-term pressure peaks.

Landscapes

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

Abstract

L'invention concerne un dispositif pré-tensionneur (10) pour une ceinture de sécurité, notamment dans un véhicule motorisé, comportant un générateur de gaz (17), un canal (16) reliant le générateur de gaz (17) à un arbre d'enrouleur de ceinture (12), un dispositif de transmission de force (19) disposé coulissant dans le canal (16), et destiné à entraîner l'arbre d'enrouleur de ceinture (12) à la suite du déclenchement du générateur de gaz (17), et un élément piston (21) logé coulissant dans le canal (16). L'élément piston (21) comporte un élément soupape précontraint (31) libérant un passage (33, 29, 36) à travers l'élément de piston en cas de dépassement d'une pression de gaz définie.
PCT/EP2009/002258 2008-04-09 2009-03-27 Dispositif pré-tensionneur pour une ceinture de sécurité WO2009124664A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008018124.2 2008-04-09
DE200810018124 DE102008018124B4 (de) 2008-04-09 2008-04-09 Straffervorrichtung für einen Sicherheitsgurt

Publications (1)

Publication Number Publication Date
WO2009124664A1 true WO2009124664A1 (fr) 2009-10-15

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Family Applications (1)

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PCT/EP2009/002258 WO2009124664A1 (fr) 2008-04-09 2009-03-27 Dispositif pré-tensionneur pour une ceinture de sécurité

Country Status (2)

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DE (1) DE102008018124B4 (fr)
WO (1) WO2009124664A1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011044997A1 (fr) * 2009-10-15 2011-04-21 Autoliv Development Ab Dispositif tendeur pour un enrouleur de ceinture d'une ceinture de sécurité
WO2011050909A1 (fr) * 2009-10-30 2011-05-05 Autoliv Development Ab Enrouleur de ceinture de sécurité comprenant un dispositif de tension
WO2011066909A1 (fr) * 2009-12-01 2011-06-09 Autoliv Development Ab Dispositif tendeur pour ceinture de sécurité
EP2335985A1 (fr) * 2009-12-15 2011-06-22 Takata Corporation Rétracteur de ceinture de sécurité et son appareil de ceinture de sécurité
WO2011134574A1 (fr) * 2010-04-27 2011-11-03 Autoliv Development Ab Dispositif tendeur conçu pour une ceinture de sécurité
WO2016135034A1 (fr) * 2015-02-23 2016-09-01 Autoliv Development Ab Prétensionneur de ceinture de sécurité
DE102016105540A1 (de) * 2016-03-24 2017-09-28 Autoliv Development Ab Gurtstraffer mit zweiteiligem Kolben
CN107264467A (zh) * 2016-04-07 2017-10-20 上海和励信息科技有限公司 预紧式张紧装置、驱动单元和预紧式安全装置
DE102018121999A1 (de) * 2018-09-10 2020-03-12 Autoliv Development Ab Pyrotechnische Straffvorrichtung für einen Sicherheitsgurt einer Sicherheitsgurteinrichtung mit einer Kraftbegrenzungseinrichtung
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
WO2020119405A1 (fr) * 2018-12-12 2020-06-18 奥托立夫开发公司 Dispositif de serrage rotatif pour ceinture de sécurité, et piston associé
DE102015211446B4 (de) * 2015-06-22 2020-08-20 Joyson Safety Systems Germany Gmbh Strafferantrieb für eine Sicherheitsgurteinrichtung

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009030215B4 (de) * 2009-06-23 2013-03-07 Autoliv Development Ab Sicherheitsgurteinrichtung mit einem Gurtstraffer und einer Kraftbegrenzungseinrichtung
DE102014222160B4 (de) 2014-10-30 2024-05-02 Joyson Safety Systems Germany Gmbh Strafferantrieb für einen Gurtaufroller

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2408173A1 (de) * 1973-02-22 1974-09-26 Nissan Motor Sicherheitsgurtsystem mit servomotor
JP2001225723A (ja) * 2000-02-15 2001-08-21 Honda Motor Co Ltd シートベルト装置用プリテンショナー
US6345504B1 (en) * 1999-08-25 2002-02-12 Takata Corporation Pretensioner with gas escape mechanism
US20030122362A1 (en) * 2001-11-13 2003-07-03 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Pretensioner device
DE102004045977A1 (de) * 2004-09-22 2006-03-23 Trw Automotive Gmbh Pyrotechnischer Gurtstraffer-Antrieb

Family Cites Families (6)

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DE19512660C2 (de) * 1994-04-11 1999-11-18 Autoliv Dev Pyrotechnischer Rotationsstraffer mit Massekörperantrieb
DE19545795C1 (de) * 1995-12-08 1997-03-20 Autoliv Dev Pyrotechnische Antriebsvorrichtung mit Überdrucksicherung
US6532739B2 (en) * 1999-08-25 2003-03-18 Takata Corporation Pretensioner
JP3943295B2 (ja) * 1999-08-25 2007-07-11 タカタ株式会社 プリテンショナ及びそれを有するシートベルト装置
FR2876968B1 (fr) * 2004-10-26 2007-01-12 Livbag Soc Par Actions Simplif Generateur de gaz equipe de moyens de regulation de pression et dispositif de securite qui en est pourvu.
DE102005029032B4 (de) * 2005-06-21 2007-08-02 Autoliv Development Ab Vorrichtung zum Straffen eines Sicherheitsgurtes mit einem Gasgenerator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2408173A1 (de) * 1973-02-22 1974-09-26 Nissan Motor Sicherheitsgurtsystem mit servomotor
US6345504B1 (en) * 1999-08-25 2002-02-12 Takata Corporation Pretensioner with gas escape mechanism
JP2001225723A (ja) * 2000-02-15 2001-08-21 Honda Motor Co Ltd シートベルト装置用プリテンショナー
US20030122362A1 (en) * 2001-11-13 2003-07-03 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Pretensioner device
DE102004045977A1 (de) * 2004-09-22 2006-03-23 Trw Automotive Gmbh Pyrotechnischer Gurtstraffer-Antrieb

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011044997A1 (fr) * 2009-10-15 2011-04-21 Autoliv Development Ab Dispositif tendeur pour un enrouleur de ceinture d'une ceinture de sécurité
DE102009049576B4 (de) * 2009-10-15 2016-02-25 Autoliv Development Ab Straffervorrichtung für einen Gurtaufroller eines Sicherheitsgurtes
CN102596653A (zh) * 2009-10-30 2012-07-18 奥托立夫开发公司 具有张紧装置的安全带自动伸缩器
WO2011050909A1 (fr) * 2009-10-30 2011-05-05 Autoliv Development Ab Enrouleur de ceinture de sécurité comprenant un dispositif de tension
CN102596653B (zh) * 2009-10-30 2014-10-08 奥托立夫开发公司 具有张紧装置的安全带自动伸缩器
DE102009056244A1 (de) * 2009-12-01 2011-06-09 Autoliv Development Ab Straffervorrichtung für einen Sicherheitsgurt
DE102009056244B4 (de) * 2009-12-01 2015-10-29 Autoliv Development Ab Straffervorrichtung für einen Sicherheitsgurt
WO2011066909A1 (fr) * 2009-12-01 2011-06-09 Autoliv Development Ab Dispositif tendeur pour ceinture de sécurité
US8684294B2 (en) 2009-12-15 2014-04-01 Takata Corporation Seat belt retractor and seat belt apparatus including the same
EP2335985A1 (fr) * 2009-12-15 2011-06-22 Takata Corporation Rétracteur de ceinture de sécurité et son appareil de ceinture de sécurité
WO2011134574A1 (fr) * 2010-04-27 2011-11-03 Autoliv Development Ab Dispositif tendeur conçu pour une ceinture de sécurité
WO2016135034A1 (fr) * 2015-02-23 2016-09-01 Autoliv Development Ab Prétensionneur de ceinture de sécurité
DE102015211446B4 (de) * 2015-06-22 2020-08-20 Joyson Safety Systems Germany Gmbh Strafferantrieb für eine Sicherheitsgurteinrichtung
DE102016105540A1 (de) * 2016-03-24 2017-09-28 Autoliv Development Ab Gurtstraffer mit zweiteiligem Kolben
DE102016105540B4 (de) 2016-03-24 2019-01-24 Autoliv Development Ab Gurtstraffer mit zweiteiligem Kolben
CN107264467B (zh) * 2016-04-07 2019-06-25 和励科技有限公司 预紧式张紧装置、驱动单元和预紧式安全装置
CN107264467A (zh) * 2016-04-07 2017-10-20 上海和励信息科技有限公司 预紧式张紧装置、驱动单元和预紧式安全装置
DE102018121999A1 (de) * 2018-09-10 2020-03-12 Autoliv Development Ab Pyrotechnische Straffvorrichtung für einen Sicherheitsgurt einer Sicherheitsgurteinrichtung mit einer Kraftbegrenzungseinrichtung
DE102018121999B4 (de) 2018-09-10 2023-08-31 Autoliv Development Ab Pyrotechnische Straffvorrichtung für einen Sicherheitsgurt einer Sicherheitsgurteinrichtung mit einer Kraftbegrenzungseinrichtung
US11970132B2 (en) 2018-09-10 2024-04-30 Autoliv Development Ab Pyrotechnic tightening device for a safety belt of a safety belt unit having a force-limiting unit
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
CN111196243B (zh) * 2018-11-16 2024-06-04 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
WO2020119405A1 (fr) * 2018-12-12 2020-06-18 奥托立夫开发公司 Dispositif de serrage rotatif pour ceinture de sécurité, et piston associé
CN111301340A (zh) * 2018-12-12 2020-06-19 奥托立夫开发公司 用于安全带的旋转收紧装置及其活塞体

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Publication number Publication date
DE102008018124A1 (de) 2009-11-05
DE102008018124B4 (de) 2010-06-17

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