WO2024023007A1 - Enrouleur de ceinture pour un dispositif de ceinture de sécurité d'un véhicule automobile - Google Patents

Enrouleur de ceinture pour un dispositif de ceinture de sécurité d'un véhicule automobile Download PDF

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Publication number
WO2024023007A1
WO2024023007A1 PCT/EP2023/070427 EP2023070427W WO2024023007A1 WO 2024023007 A1 WO2024023007 A1 WO 2024023007A1 EP 2023070427 W EP2023070427 W EP 2023070427W WO 2024023007 A1 WO2024023007 A1 WO 2024023007A1
Authority
WO
WIPO (PCT)
Prior art keywords
belt
frame
belt retractor
shaft
belt shaft
Prior art date
Application number
PCT/EP2023/070427
Other languages
German (de)
English (en)
Inventor
Martin Schmidt
Markus Hueg
Frank Jacobs
Arne Bargmann
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 WO2024023007A1 publication Critical patent/WO2024023007A1/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
    • B60R22/341—Belt retractors, e.g. reels comprising energy-absorbing means
    • B60R22/3413—Belt retractors, e.g. reels comprising energy-absorbing means operating between belt reel and retractor frame
    • 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
    • B60R22/28—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices
    • B60R2022/286—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices using deformation of material
    • B60R2022/287—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices using deformation of material of torsion rods or tubes
    • 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
    • B60R22/28—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices
    • B60R2022/288—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices with means to adjust or regulate the amount of energy to be absorbed

Definitions

  • the present invention relates to a belt retractor for a seat belt device of a motor vehicle with the features of the preamble of claim 1.
  • Modern belt retractors in seat belt systems of motor vehicles have, in addition to various other functions, a force limiting device as a central function, which enables a force-limited belt pull-out if the belt shaft of the belt retractor is blocked.
  • the force-limited webbing extension enables the occupant to move forward in a force-limited manner in the event of an accident, which in turn can reduce the load on the occupants. It has proven useful in practice to design the force limiting device in the form of a plastically deformable torsion bar, which is arranged in a cavity in the belt shaft.
  • the torsion bar is fixed with one end in a rotationally fixed manner in an inner profile of the cavity of the belt shaft and with its other end in a rotationally fixed manner with a profile head that can be blocked in a vehicle-mounted manner via a blocking pawl in a frame of the belt retractor.
  • the force limiting device is then activated by blocking the profile head in the pull-out direction via the blocking pawl, and the pull-out force of the webbing exceeds a pull-out force defined by the plastic deformation limit of the torsion bar.
  • the belt shaft rotates in the pull-out direction relative to the blocked profile head, with a plastic deformation of the torsion bar about its longitudinal axis.
  • the belt retractor is, for example, attached to the B-pillar or another part of the vehicle structure that is designed to absorb the restraining forces during the force-limited belt extension.
  • the aim is to give the occupant additional freedom of movement so that they can use the freedom gained through autonomous driving, for example to rest, have more intensive conversations with the other occupants or even to work can.
  • the seats should be as variable as possible, which eliminates the fixed spatial assignment of the vehicle seat and the occupant sitting on it to the vehicle structure becomes. For this reason, it makes sense in this case to integrate the belt retractor of the seat belt device into the vehicle seat, so that the seat belt pulled out from it is always arranged in a fixed spatial relationship to the occupant sitting on the vehicle seat, regardless of the position and orientation of the vehicle seat.
  • the free space available in the vehicle seat for attaching the belt retractor is limited. This is particularly the case if the vehicle seat is to be designed with a backrest or seat that is as thin as possible for aesthetic reasons or for reasons of a smaller available installation space in the vehicle interior.
  • the belt retractor with the torsion bar arranged in the belt shaft can only be made smaller to a limited extent with regard to these requirements, since the belt shaft with the torsion bar arranged therein and the coil of the seat belt wound on it has a comparatively large outer diameter.
  • the invention is based on the object of creating a belt retractor with a force limiting device, which can also be arranged in a narrower installation space of a motor vehicle and in particular in a narrower backrest or seat of a vehicle seat.
  • the force limiting device is arranged outside the belt shaft and is supported on the frame of the belt retractor, and the blocking device blocks the belt shaft when activated against a toothed ring which is non-positively connected to the force limiting device.
  • the advantage of the invention can be seen in the fact that the force limiting device is no longer arranged within the belt shaft, so that the belt shaft has a significant smaller outside diameter can be carried out.
  • the belt shaft is the component which is crucial for the width or thickness of the belt retractor perpendicular to the axis of rotation of the belt shaft, since this is the largest component of the belt retractor in the frame.
  • the entire belt retractor can be made narrower or thinner overall due to the reduced belt shaft and can therefore also be fastened in an installation space of the vehicle with a smaller depth, such as in a narrower backrest of a vehicle seat.
  • the outer diameter of the belt shaft is then only increased by the coil of the seat belt wound on it.
  • the force limiting device is arranged outside the belt shaft and is supported on the frame of the belt retractor.
  • a toothed ring is provided, against which the blocking device blocks the belt shaft when activated.
  • the blocking device no longer blocks the belt shaft in relation to a toothing fixed to the frame, as was previously the case, but instead in the additionally provided toothing ring, which is non-positively connected to the force limiting device.
  • the blocking device therefore no longer blocks the belt shaft directly in relation to the frame, but instead in relation to the toothed ring, which is supported on the force limiting device, which in turn is supported directly or indirectly on the frame.
  • the belt retractor can be made particularly narrow by designing the belt shaft as a solid shaft.
  • the term solid shaft is to be understood to mean that there are no other components in the belt shaft.
  • the belt shaft can of course have additional weight-reducing recesses and cavities, provided that the rigidity of the belt shaft allows this in relation to the forces to be absorbed.
  • the frame is U-shaped with a base plate and two legs protruding parallel therefrom, and the belt shaft is rotatably mounted in the opposite legs of the frame.
  • the belt retractor can, for example, be attached to the vehicle seat or the vehicle structure via the base plate, while the legs serve to support the belt shaft.
  • the proposed structure enables a particularly lightweight embodiment of the belt retractor.
  • a recess is provided in the base plate of the frame in a section opposite the belt shaft. Due to the recess in the base plate, the belt shaft can be arranged in the frame closer to the base plate without the seat belt wound on the belt shaft coming into contact with the base plate.
  • the recess is preferably rectangular and wider than the belt wrap on the belt shaft, so that when the seat belt is wound up and the resulting increase in diameter, the belt wrap can enter the recess and does not hit the base plate.
  • the height of the recess can be larger or smaller, so that the belt wrap can only protrude through the recess in the base plate with a small portion of its circumference or with a much larger portion of its circumference.
  • the legs have a height starting from the base plate, which is smaller than the outer diameter of the belt shaft with the coil of the seat belt wound on it.
  • the belt retractor can therefore be made narrower in the extension of the legs and can therefore be specially designed for arrangement in narrower installation spaces.
  • the frame is stiffened by additional webs connecting the legs to one another. Due to the solution according to the invention, the frame not only serves to support the belt shaft and to attach the belt retractor to the vehicle or vehicle seat, but also to support the force limiting device. This puts a significantly higher load on the frame. So that the frame does not have to be thicker to absorb the forces, but at the same time has the necessary rigidity to absorb the additional forces and does not deform under the load, it is additionally stiffened by the webs.
  • the force limiting device has a first torsion bar, which has a first end in a non-positive manner with the toothed ring and with its second end is fixed opposite the frame.
  • Torsion bars have generally proven useful for implementing the force limiting device, since they can dissipate a comparatively large amount of energy through plastic deformation with a very small space requirement and thus enable a correspondingly high level of force limitation.
  • the torsion bar is then not arranged in the belt shaft, but instead on the frame outside the belt shaft, whereby its rod shape allows it to be arranged adjacent to the belt shaft in a space-saving manner.
  • the force limiting device has at least one second torsion bar, which is fixed with a first end in a non-positive manner with the toothed ring and with its second end in relation to the frame.
  • the force limitation level can be increased by the second torsion bar and its parallel arrangement to the first torsion bar, i.e. a high force limitation level can be achieved by a parallel action of two or more smaller torsion bars.
  • the second torsion bar can be activated or deactivated via a switching device.
  • the force limitation level can be actively changed by switching the switching device.
  • the second torsion bar has a higher or lower plastic deformation limit than the first torsion bar or that the second torsion bar has the same plastic deformation limit as the first torsion bar. Due to the higher, lower or equal deformation limit of the second torsion bar and its circuit, a preferably graduated force limiting course can be achieved, the force limiting course being able to be progressively or degressively stepped depending on the switching of the switching device.
  • the first torsion bar has a force limitation level of 2 kN and the second torsion bar has a force limitation level of 4 kN
  • the force limitation level in the initial phase of force limitation there is a force limitation level of 6 kN in that both torsion bars are deformed at the same time and the force limitation levels are adjusted. dieren.
  • the second torsion bar is switchable and is switched after a predetermined extension length by actuating the switching device, the force limitation level then drops from 6 kN to 2kN and the first torsion bar effects the force limitation alone.
  • the torsion bars be arranged between the legs with their longitudinal axes parallel to the axis of rotation of the belt shaft. This means that the torsion bars can be arranged in a particularly compact and space-saving manner parallel to the belt shaft, making use of the lateral free space next to the belt shaft. Furthermore, the rotational movement of the belt shaft does not have to be redirected in a different direction.
  • a transmission gear that translates the rotational movement of the belt shaft into a higher speed is provided between the toothed ring and the force limiting device. Due to the transmission gear, the torsion bars rotate faster than the belt shaft during deformation. This means that smaller and thinner torsion bars with a correspondingly high deformation stiffness can be selected, which dissipate more energy by increasing the speed. This means that a predetermined force limitation level can also be achieved using thinner torsion bars.
  • the transmission gear is formed by one or more gears, which have axes of rotation aligned parallel to the axis of rotation of the belt shaft, one of the gears being in a toothing engagement with the toothed ring.
  • the proposed solution allows the rotational movement of the toothed ring to be transmitted to the force limiting device in a very compact design of the transmission without a deflection. If the force limiting device is designed in the form of one or more torsion bars, the rotational movement can be particularly easily transferred into a rotational movement of the torsion bars.
  • the torsos can onsstabe for a particularly compact design with their longitudinal axes parallel to the axis of rotation of the belt shaft.
  • the gear or gears of the transmission gear is or are arranged in a plane with the toothed ring.
  • the transmission gear thus forms a flat, flat assembly, which can be arranged, for example, on the outside of one of the legs of the frame.
  • Fig. 3 and 4 the belt retractor with the force limiting device in different switching states.
  • the belt retractor 1 can be seen with a frame 2, a belt shaft 3 rotatably mounted therein and a force limiting device 4.
  • the seat belt that can be wound on the belt shaft 3 has been omitted in order to improve the visibility of the parts.
  • the frame 2 is U-shaped with a base plate 27 and two webs 23 and 24 protruding parallel to one another and is additionally stiffened by two webs 25 and 26 connecting the legs 23 and 24 to one another.
  • the belt shaft 3 is rotatably mounted in the legs 23 and 24.
  • the force limiting device 4 is supported on the frame 2 directly or indirectly, for example via the drive of a reversible belt tensioner (not shown) attached thereto.
  • the base plate 27 of the frame 2 has a recess 29, which is arranged so that it lies opposite the belt shaft 3. Furthermore, the legs 23 and 24 are dimensioned in the height H extending from the base plate 27 so that their height H is less than or equal to the diameter D of the belt shaft plus the coil of the seat belt completely wound on it. This means that the frame 2 can be made smaller in terms of the height of the legs 23 and 24. can be performed in that the coil of the fully wound seat belt can protrude slightly into the base plate 27 or protrude through it. The weakening of the frame 2 through the recess 29 can be compensated for by increasing the rigidity through the webs 25 and 26.
  • a blocking device 5 in the form of a pivotally mounted blocking pawl is provided on the belt shaft 3, the movement of which is controlled by a control disk (not shown) which is spring-loaded in the winding direction of the belt shaft 3.
  • the control disk is stopped relative to the belt shaft 3 when a predetermined pull-out acceleration of the seat belt is exceeded or a predetermined vehicle deceleration, which is detected via a corresponding WS sensor device and CS sensor device, is exceeded, and the blocking pawl then becomes a control movement relative to the belt shaft 3 forced.
  • the blocking pawl then swings out and moves into an internal toothing 11 of a toothing ring 8.
  • the toothed ring 8 engages with an external toothing 12 in a toothing 13 of a first gear 9, which in turn meshes with its toothing 13 with a toothing 14 of a second gear 10.
  • the first gear 9 is connected in a rotationally fixed manner to a first end 15 of a first torsion bar 6, and the second gear 10 is connected in a rotationally fixed manner to a first end 17 of a second torsion bar 7.
  • the first torsion bar 6 and the second torsion bar 7 are supported with their second ends 21 and 22 on the frame 2 of the belt retractor 1 via further gear wheels.
  • the second ends 21 and 22 of the torsion bars 6 and 7 are therefore to be regarded as fixed to the frame or fixed to the vehicle.
  • the sleeve 19 comprises the second torsion bar 7 and has, on its side facing the first end 17 of the second torsion bar 7, protruding axial fingers 18, with which it engages in corresponding recesses in the second gear 10 and the first end 17 of the second torsion bar 7 and thereby Non-rotatable connection between the first end 17 of the second torsion bar 7 and the second gear 10 forms.
  • the sleeve 19 When the switching device 20 is activated, the sleeve 19 is displaced axially in the direction of the second end 22 of the second torsion bar 7, as can be seen in FIG. This displacement movement of the sleeve 19 causes it to disengage from the recesses with the axial fingers 18, and the rotation-proof connection between the second gear 10 and the first end 17 of the second torsion bar 7 is canceled.
  • the occupant is initially restrained in an accident by blocking the belt shaft 3 relative to the toothed ring 8 when the predetermined pull-out acceleration of the seat belt is exceeded or the predetermined vehicle deceleration is exceeded by controlling the blocking pawl into the internal toothing 11. If the tensile force exerted on the belt shaft 3 via the seat belt subsequently exceeds a value defined by the dimensioning of the force limiting device 4, the belt shaft 3 begins to rotate with the toothed ring 8 in the extension direction of the seat belt while activating the force limiting device 4, with the occupant experiencing a force-limited forward displacement with a reduced occupant load.
  • the first torsion bar 6 and the second torsion bar 7 are arranged parallel to one another and are simultaneously plastically deformed in the initial phase of the force-limited forward displacement of the occupant by the first ends 15 and 17 of the two torsion bars 6 and 7 rotating relative to the second ends 21 and 22, which are blocked fixed to the frame .
  • the energies dissipated in the two torsion bars 6 and 7 add up to a higher force limitation level. If the torsion bars 6 and 7 are identical, the force limitation level is doubled.
  • the switching device 20 is actuated, the rotationally fixed connection between the second gear 10 and the first end 17 of the second torsion bar 7 is canceled, so that the second torsion bar 7 is then no longer plastically deformed.
  • the force limitation level is then reduced in accordance with the proportion of the force limitation level of the second torsion bar 7. This results in a stepped, degressive course of the force limitation level during the force-limited forward displacement of the occupant.
  • the torsion bars 6 and 7 are aligned so that their longitudinal axes are aligned parallel to the axis of rotation of the belt shaft 3.
  • the rotational movement of the belt shaft 3 can be achieved by a transmission gear, formed by the toothed ring 8 and the two gears 9 and 10 with axes of rotation aligned parallel to the longitudinal axes of the torsion bars 6 and 7 and the axis of rotation of the belt shaft 3, from a slower rotational movement of the belt shaft 3 a faster rotational movement of the first ends 15 and 17 of the two torsion bars 6 and 7 can be translated.
  • the toothed ring 8 and the two gears 9 and 10 are arranged in a compact design in one plane on the outside of the leg 24 of the frame 2.
  • the two gears 9 and 10 each have an inner profile 16 and 28, with the first end 15 of the first torsion bar 6 being fixed in a rotationally fixed manner directly in the inner profile 16 of the first gear 9, and the first end 17 of the second torsion bar 7 via the sleeve 19 is connected in a rotationally fixed manner to the second gear 10.
  • the sleeve 19 engages with the axial fingers 18 in the inner profile 28 of the second gear 10 and the outer profile of the first end 17 of the second torsion bar 7, and thus establishes the connection between the two parts.
  • the belt retractor 1 is additionally stiffened by the two webs 25 and 26.
  • the webs 25 and 26 are also aligned parallel to the axis of rotation of the belt shaft 3 and to the longitudinal axes of the torsion bars 6 and 7.
  • the webs 25 and 26 thus stiffen the belt retractor 1 and the frame 2, in particular against the compressive forces exerted by the torsion bars 6 and 7 during the plastic deformation.
  • the force limiting device 4 is deliberately moved out of the belt shaft 3 into a free space of the frame 2 adjacent to the belt shaft 3, so that the belt shaft 3 itself can be designed with a correspondingly smaller outside diameter.
  • the belt shaft 3 can even be designed as a solid shaft in which no further components are arranged.
  • the belt shaft 3 can have weight-reducing recesses or free spaces or a free space for holding a belt pin with an end of the seat belt attached to it

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

Abstract

L'invention concerne un enrouleur de ceinture (1) pour un dispositif de ceinture de sécurité d'un véhicule automobile, comprenant : -une tige de ceinture (3) qui est montée de manière rotative dans un cadre (2) et sur laquelle une ceinture de sécurité du dispositif de ceinture de sécurité peut être enroulée, -un dispositif de blocage (5) qui bloque la tige de ceinture (3) dans une direction d'extraction lorsqu'il est activé, et -un dispositif de limitation de force (4) qui permet une extraction limitée en force de la ceinture de sécurité lorsqu'il est activé et lorsque la tige de ceinture (3) est bloquée, le dispositif de limitation de force (4) étant disposé à l'extérieur de la tige de ceinture (3) et étant supporté sur le cadre (2) de l'enrouleur de ceinture (1) et, lorsqu'il est actionné, le dispositif de blocage (5) bloquant la tige de ceinture (3) par rapport à une bague dentée (8) qui est reliée à l'élément de limitation de force (4) par ajustement serré.
PCT/EP2023/070427 2022-07-27 2023-07-24 Enrouleur de ceinture pour un dispositif de ceinture de sécurité d'un véhicule automobile WO2024023007A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022118865.5A DE102022118865A1 (de) 2022-07-27 2022-07-27 Gurtaufroller für eine Sicherheitsgurteinrichtung eines Kraftfahrzeuges
DE102022118865.5 2022-07-27

Publications (1)

Publication Number Publication Date
WO2024023007A1 true WO2024023007A1 (fr) 2024-02-01

Family

ID=87473760

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2023/070427 WO2024023007A1 (fr) 2022-07-27 2023-07-24 Enrouleur de ceinture pour un dispositif de ceinture de sécurité d'un véhicule automobile

Country Status (2)

Country Link
DE (1) DE102022118865A1 (fr)
WO (1) WO2024023007A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10034759A1 (de) * 2000-07-18 2002-02-07 Autoliv Dev Sicherheitsgurt-Rückhaltevorrichtung mit Kraftbegrenzungseinrichtung
US20050284978A1 (en) * 2004-06-29 2005-12-29 Zolkower Jeffry N Dual level load limiting belt retractor with mechanical load switching
DE102014207590A1 (de) * 2014-04-22 2014-06-18 Takata AG Gurtaufroller

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19747461A1 (de) 1997-10-27 1999-04-29 Takata Europ Gmbh Gurtaufroller
CN107107865B (zh) 2014-08-15 2019-05-14 天合汽车安全系统股份有限公司 具有自适应负载限制的座椅安全带卷收器

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10034759A1 (de) * 2000-07-18 2002-02-07 Autoliv Dev Sicherheitsgurt-Rückhaltevorrichtung mit Kraftbegrenzungseinrichtung
US20050284978A1 (en) * 2004-06-29 2005-12-29 Zolkower Jeffry N Dual level load limiting belt retractor with mechanical load switching
DE102014207590A1 (de) * 2014-04-22 2014-06-18 Takata AG Gurtaufroller

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Publication number Publication date
DE102022118865A1 (de) 2024-02-01

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