WO2009012860A2 - Prétendeur de ceinture - Google Patents

Prétendeur de ceinture Download PDF

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Publication number
WO2009012860A2
WO2009012860A2 PCT/EP2008/005179 EP2008005179W WO2009012860A2 WO 2009012860 A2 WO2009012860 A2 WO 2009012860A2 EP 2008005179 W EP2008005179 W EP 2008005179W WO 2009012860 A2 WO2009012860 A2 WO 2009012860A2
Authority
WO
WIPO (PCT)
Prior art keywords
piston
sealing sleeve
cylinder
belt tensioner
sleeve member
Prior art date
Application number
PCT/EP2008/005179
Other languages
German (de)
English (en)
Other versions
WO2009012860A3 (fr
Inventor
Walter Eberle
Till Heinrich
Original Assignee
Daimler 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 Daimler Ag filed Critical Daimler Ag
Publication of WO2009012860A2 publication Critical patent/WO2009012860A2/fr
Publication of WO2009012860A3 publication Critical patent/WO2009012860A3/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
    • B60R22/18—Anchoring devices
    • B60R22/195—Anchoring devices with means to tension the belt in an emergency, e.g. means of the through-anchor or splitted reel type
    • B60R22/1952—Transmission of tensioning power by cable; Return motion locking means therefor

Definitions

  • the present invention relates to a belt tensioner for a safety belt with a piston which is slidably disposed in a cylinder, according to the preamble of claim 1.
  • the invention also relates to a motor vehicle equipped with such a belt tensioner.
  • Belt tensioners are generally used to quickly retract a possibly existing belt slack when triggered, so that the seat belt can fully develop its protective effect for the occupant.
  • the seat belt device In order to minimize the burden on the vehicle occupant in the event of a crash, the seat belt device must be able to absorb as much of the kinetic energy of the vehicle occupant as possible. For this purpose, so-called. Gurtkraftbegrenzer be used, which convert the absorbed energy into plastic deformation.
  • a generic belt tensioner in which a piston is provided with a deformation element, which acts on a tensile transfer means.
  • the train transmission means is firmly connected on the one hand to a displacer and on the other hand on the seat belt.
  • the deformation element itself serves on the one hand the connection between the piston and displacer element, but on the other hand can be plastically deformed by a force acting on the tension transmission means, whereby it acts as a force limiting device.
  • This function can be the deformation element, which is designed for example as a deformation tube, regardless of the position meet the piston, so that the force limiting function is guaranteed even when not activated belt tensioner.
  • Modern belt tensioners usually work with a drive device designed as a gas generator, which generates a gas expanding in an expansion chamber and thus a gas pressure acting on the piston in the event of activation.
  • a drive device designed as a gas generator, which generates a gas expanding in an expansion chamber and thus a gas pressure acting on the piston in the event of activation.
  • this poses the problem that the expanding gas in the expansion chamber escape through the supply of Buchübertragungsffens and thus the initially built pressure can not be maintained.
  • the traction transfer medium can be encased and / or further sealing elements can be used.
  • the present invention is concerned with the problem of providing for a generic belt tensioner of the type mentioned an improved or at least another embodiment, with which in particular a long Straffweg and a sustained force impact are structurally easily accessible.
  • the invention is based on the general idea, between a piston of a belt tensioner and a piston coaxially penetrating the traction transfer means to provide a sealing sleeve member which is formed from a cylinder, the piston and the sealing sleeve member expansion chamber of a Gas generator seals in such a way that the gas pressure generated in the case of activation of the belt tensioner can not escape via the train transmission means to the outside.
  • the traction transfer means is on the one hand firmly connected to a displacer and on the other hand with the seat belt, wherein between the piston and the displacer a deformation tube is arranged, which extends coaxially outside the traction transfer means and penetrates the piston axially.
  • the gas generator can exert a driving force in the manner of a gas pressure in the activation case of the belt tensioner on the piston, whereby the seat belt is tightened.
  • the tension transmission means is guided, whereas the piston is mounted axially displaceably on the sealing sleeve member. This permeates with the traction transfer agent
  • Sealing sleeve member the piston axially and is fixedly connected at its first end to a cylinder end wall of the cylinder, while it protrudes with its second end coaxially into the cylinder.
  • the expansion chamber is sealed by the sealing sleeve member against the traction transfer means and thus to the outside, whereby the gas pressure is maintained for a long time.
  • an escape of the pressure built up in the expansion chamber gas pressure can be done only from a predefined Straffweg, in which the piston is no longer performed on the sealing sleeve member.
  • the sealing sleeve element expediently has a smaller axial length than the deformation tube.
  • the axial length of the sealing sleeve element determines the critical Straffweg, to which the piston is guided on the sealing sleeve member and thereby the combustion chamber is sealed to the outside.
  • this critical Straffweges is exceeded, the piston is guided only in the cylinder, but not more on the sealing sleeve member, whereby a gas outlet from the now not completely sealed to the outside expansion chamber can be done.
  • the piston is provided with a backstop, which prevents the piston can be moved back to its initial position after the tightening process. If the piston has reached the critical straining distance mentioned in the previous paragraph, the piston can be returned to its original position by the subsequent venting process, provided that it is not prevented by this backstop, as provided for by the invention.
  • the backstop thus causes the piston held in its reversal point and can not be moved back to its original position.
  • a backstop may comprise, for example, rolling elements which are clamped in a backward adjustment of the piston between the latter and the cylinder and thereby prevent the back adjustment of the piston.
  • the sealing sleeve member is formed compressible or foldable and / or has a predetermined breaking point in the region of the connection to the cylinder end wall or on the the displacer zugewanden page.
  • the sealing sleeve element is expanded or folded when pulling out the traction transfer means.
  • the connection between the sealing sleeve element and the cylinder end wall has a predetermined breaking point, which breaks when a predefined force is exceeded and thereby the sealing sleeve element, for example, also under a plastic deformation, can be pushed out of the cylinder end wall.
  • the sealing sleeve member can also be split or braced by means of a gap element, for example by means of a wedge, with material and energy consumption, which also an energy-absorbing exhaust behavior can be achieved.
  • Fig. 2 shows a possible Kraftwegdiagramm in the activation of the belt tensioner according to the invention.
  • an inventive belt tensioner 1 has a piston 2, which is arranged displaceably in a cylinder 3.
  • the piston 2 is connected to a deformation tube 4, which at the other end, i. with its end facing away from the piston 2, is connected to a displacer 5 and rests against this.
  • the displacement element 5 has a round, in particular an olive-like shape, although other cross-sectional or outer shapes are also conceivable.
  • the displacer 5 is fixedly connected to a train transmission means 6, which is connected at its end facing away from the displacer 5 with a seat belt, not shown.
  • the Switzerlandübertragüngsstoff 6 may be formed, for example, as mantellose steel cable.
  • the deformation tube 4 is arranged between the piston 2 and the displacement element 5. wherein the tension transmission means 6 extends coaxially within the deformation tube 4 and penetrates the piston 2 axially. Furthermore, a sealing sleeve member 7 is provided, in which the traction transfer means 6 is guided and on which the piston 2 is mounted axially displaceable. The piston 2 is preferably guided gas-tight on the sealing sleeve element 7. The sealing sleeve member 7 penetrates as well as the traction transfer means 6 the piston
  • the sealing sleeve member 7 serves to seal an expansion chamber 11, which is bounded by the rest of the cylinder end wall 9, the cylinder 3 and the piston 2.
  • a gas generator not shown, which can generate, for example by igniting a gas in the expansion chamber 11, a gas pressure in the same and thereby a driving force on the piston 2.
  • the sealing sleeve element 7 protrudes coaxially into the deformation tube 4 with its end 10 coaxial with the belt tensioner 1 not activated.
  • the sealing sleeve element 7 is made shorter than the deformation tube 4, whereby a predefined tensioning path to be described below can be set.
  • This so-called “critical” Straffweg marks the way in which the piston 2 is no longer gas-tight on the sealing sleeve element 7, but exclusively in the cylinder
  • a backstop which prevents the piston 2 after the tightening process back into its initial position, as shown in FIG. 1, can be moved back.
  • a backstop for example, a plurality of blocking elements, in particular rolling elements having, which are arranged between the piston 2 and a cylinder inner wall and clamp in a return movement of the piston 2 relative to the cylinder inner wall and thereby fix.
  • the sealing sleeve member 7 may be formed compressible, stretchable or foldable, and / or have a predetermined breaking point 12 in the region of the connection to the cylinder end wall 9 in the region of its first end 8.
  • a predetermined breaking point 12 causes the connection between the sealing sleeve element 7 and the cylinder end wall 9 to break when the pulling transmission means 6 is pulled out, provided that the displacement element 5 exerts a sufficiently high force on the second end 10 of the sealing sleeve element 7.
  • a predetermined breaking point is also the side facing the displacement element 5.
  • the belt tensioner 1 functions as follows:
  • the piston 2 is guided in a gas-tight manner on the sealing sleeve element 7 until such time as the piston 2 reaches the second end 10 of the sealing sleeve element 7. After the critical tensioning path has been exceeded, the piston 2 is no longer guided on the sealing sleeve element 7, but only in the cylinder 3, which causes the gas under pressure in the now enlarged expansion chamber 11 to move Such a drop in gas pressure and the force acting at the same time on the traction transfer means 6 would cause the piston 2 to shift back, provided that it would not be prevented from doing so by the backstop 12.
  • the backstop thus causes the piston 2 to move in the region of its Turning point can be maintained, for example, by rolling elements which jam between the piston 2 on the one hand and the cylinder 3, prevent retraction of the piston 2 to its original position For example, expands or otherwise deformed.
  • a force-displacement diagram is shown, wherein up to a distance Si a constant force Fi has to be expended for pulling out the traction transfer means 6 from the belt tensioner 1. Up to the withdrawal path s ⁇ only the deformation tube 4 is deformed, for example by the displacer 5 is pulled into this widening. After exceeding the deformation path Si, an increased force F 2 / F 3 is required to remove the traction transfer means 6 from the belt tensioner 1, wherein a level .DELTA.F depending on the design of the deformation sleeve 7 is individually adjustable. With the sealing sleeve member 7, a second Kraftbesky can thus be provided, which is determined solely by the length and the material of the sealing sleeve member 7.
  • the point of application of the second force limiter level depends on the retracted path which results from the slack and the elasticities in the belt and seat system. At a big recruited way an additional distance to the deformation sleeve 7 is generated, which leads to a path-dependent force limiter setting and allows such a setting. Thus, for example, the Kraftbeskyrweg can be kept lower when not activating the tightener.
  • the second level can be set high and early by selecting the sealing sleeve member 7 from a hard deformable material and a length slightly below the length of the deformation tube 4.
  • Such a second level F 2 / F 3 is also on the formation of the predetermined breaking point 12 and to be overcome after breaking the predetermined breaking point 12 static friction between the sealing sleeve member 7 on the one hand and the cylinder end wall 9 on the other.

Landscapes

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

Abstract

L'invention concerne un prétendeur (1) destiné à une ceinture de sécurité et comprenant un piston (2) monté à déplacement dans un cylindre (3). Le prétendeur (1) selon l'invention comprend en outre un moyen de transmission de traction (6) qui est relié de manière fixe, d'une part, à un élément déplaceur (5) et, d'autre part, à la ceinture de sécurité. Le prétendeur selon l'invention est caractérisé en ce qu'il comprend un élément douille d'étanchéité (7) dans lequel est guidé le moyen de transmission de traction (6) et sur lequel le piston (2) est logé à déplacement axial. L'élément douille d'étanchéité (2) pénètre axialement dans le piston (2), sa première extrémité (8) étant reliée de manière fixe à une paroi frontale (9) du cylindre (3) alors que sa deuxième extrémité (10) s'enfonce coaxialement dans le cylindre (3).
PCT/EP2008/005179 2007-07-24 2008-06-26 Prétendeur de ceinture WO2009012860A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710034401 DE102007034401B4 (de) 2007-07-24 2007-07-24 Gurtstraffer
DE102007034401.7 2007-07-24

Publications (2)

Publication Number Publication Date
WO2009012860A2 true WO2009012860A2 (fr) 2009-01-29
WO2009012860A3 WO2009012860A3 (fr) 2009-04-02

Family

ID=39773202

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/005179 WO2009012860A2 (fr) 2007-07-24 2008-06-26 Prétendeur de ceinture

Country Status (2)

Country Link
DE (1) DE102007034401B4 (fr)
WO (1) WO2009012860A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11173870B2 (en) * 2018-10-30 2021-11-16 Toyota Jidosha Kabushiki Kaisha Vehicle seat belt device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010052413B4 (de) * 2010-11-24 2016-12-22 Daimler Ag Gurtstraffer für eine Sicherheitsgurtvorrichtung eines Fahrzeuges und Verfahren zum Betrieb des Gurtstraffers
DE102017201016A1 (de) 2017-01-23 2018-07-26 Volkswagen Aktiengesellschaft Sicherheitsgurteinrichtung für ein Fahrzeug

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2258063A1 (de) * 1972-11-27 1974-06-20 Opel Adam Ag Hohlbauteil, insbesondere fuer kraftfahrzeuge
DE20102758U1 (de) * 2001-02-16 2001-06-28 Trw Repa Gmbh Gurtstraffer
DE20218869U1 (de) * 2002-12-05 2003-04-10 Trw Repa Gmbh Gurtstraffer
WO2008058580A1 (fr) * 2006-11-14 2008-05-22 Daimler Ag Tendeur de ceinture pour un système de ceinture de sécurité

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29708880U1 (de) * 1997-05-20 1997-09-18 Trw Repa Gmbh Gurtstraffer für ein Fahrzeuginsassen-Rückhaltesystem
DE20102751U1 (de) 2001-02-16 2001-05-03 Wilmers Walter Schalenstern-Anemometer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2258063A1 (de) * 1972-11-27 1974-06-20 Opel Adam Ag Hohlbauteil, insbesondere fuer kraftfahrzeuge
DE20102758U1 (de) * 2001-02-16 2001-06-28 Trw Repa Gmbh Gurtstraffer
DE20218869U1 (de) * 2002-12-05 2003-04-10 Trw Repa Gmbh Gurtstraffer
WO2008058580A1 (fr) * 2006-11-14 2008-05-22 Daimler Ag Tendeur de ceinture pour un système de ceinture de sécurité

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11173870B2 (en) * 2018-10-30 2021-11-16 Toyota Jidosha Kabushiki Kaisha Vehicle seat belt device

Also Published As

Publication number Publication date
DE102007034401A1 (de) 2009-01-29
DE102007034401B4 (de) 2011-02-03
WO2009012860A3 (fr) 2009-04-02

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