US20040188995A1 - Safety belt winder comprising a power limitation system which can be actuated according to the strip of belt pulled out - Google Patents

Safety belt winder comprising a power limitation system which can be actuated according to the strip of belt pulled out Download PDF

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Publication number
US20040188995A1
US20040188995A1 US10/478,933 US47893303A US2004188995A1 US 20040188995 A1 US20040188995 A1 US 20040188995A1 US 47893303 A US47893303 A US 47893303A US 2004188995 A1 US2004188995 A1 US 2004188995A1
Authority
US
United States
Prior art keywords
belt
switching
switching device
contact pin
ratchet wheel
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US10/478,933
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English (en)
Inventor
Gunter Clute
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Autoliv Development AB
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
Assigned to AUTOLIV DEVELOPMENT AB reassignment AUTOLIV DEVELOPMENT AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CLUTE, GUNTER
Publication of US20040188995A1 publication Critical patent/US20040188995A1/en
Priority to US11/583,293 priority Critical patent/US7690688B2/en
Abandoned legal-status Critical Current

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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
    • 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
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
    • B60R21/01512—Passenger detection systems
    • B60R21/01516—Passenger detection systems using force or pressure sensing means
    • B60R21/0152—Passenger detection systems using force or pressure sensing means using strain gauges
    • 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
    • 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
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
    • B60R21/01512—Passenger detection systems
    • B60R21/01544—Passenger detection systems detecting seat belt parameters, e.g. length, tension or height-adjustment
    • B60R21/01548—Passenger detection systems detecting seat belt parameters, e.g. length, tension or height-adjustment sensing the amount of belt winded on retractor
    • 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
    • B60R22/36—Belt retractors, e.g. reels self-locking in an emergency
    • B60R22/415—Belt retractors, e.g. reels self-locking in an emergency with additional means allowing a permanent locking of the retractor during the wearing of the belt

Definitions

  • the invention relates to a safety belt roll-up mechanism having a belt shaft that is mounted in a housing and serves as a carrier for a belt strap that can be wound onto and unwound from the belt shaft, whereby the belt roll-up mechanism is provided with a force limitation device that operates in a multi-stage manner and has a torque rod and a switching device that couples the torque rod, in various clamping lengths, with the belt shaft, and whereby the extent of the belt strap unwound from the belt shaft is utilized for the actuation of the force limitation device.
  • a safety belt roll-up mechanism having the aforementioned features is known from DE 27 27 470 A1.
  • the known safety belt roll-up mechanism has a torque rod as a force limitation device that at its one end is fixedly connected to the shaft blocking mechanism, and at its other end is coupled to the belt shaft in such a way that even when the shaft blocking mechanism is triggered, the belt shaft, upon torsion of the torque rod, can still rotate further by a certain amount.
  • the known belt roll-up mechanism has a device for the continuous alteration of the clamping length of the torque rod, which clamping length, in one embodiment of the known belt roll-up mechanism, is to be controllable as a function of the length of the belt strap withdrawn by connecting a sliding sleeve, which fixes the clamping length, with the belt shaft via a gear mechanism.
  • the known safety belt roll-up mechanism has the drawback that the sliding sleeve does not represent an adequate reliability for the fixing of the clamping length of the torque rod, and in addition, the mechanics for a continuous adaptation of the clamping length of the torque rod to the rotational speed of the belt shaft, and hence to the respectively existing belt strap withdrawal, is complicated.
  • the invention provides for a two-stage torque rod having a pyrotechnically operating switching device, and a ratchet wheel that is connected to the belt shaft via a reduction gear mechanism, whereby the ratchet wheel is provided over a portion of its periphery with a toothing for engagement with the reduction gear mechanism, and over a further portion of its periphery is provided with a switching contour that rests against a contact pin of an electric switch that is connected to the switching device for the torque rod, and the switching device is formed with a profile that effects a connection or disconnection of the switching device for the torque rod.
  • the invention is, above all, advantageously characterized in that merely one two-stage torque rod is proposed as a force limitation device, because therewith the various body sizes of large occupants or of small women, teenagers and children are adequately taken into consideration in the respectively fixed response range.
  • one, known pyrotechnical switching device for the two applicable clamping lengths of the torque rod is also usable, by means of which, in a very operationally reliable manner, the respective clamping lengths of the torque rod can be fixed, whereby when an accident is sensed, the pyrotechnical switching device is triggered or not depending upon the extent of the belt strap that is unwound from the belt shaft.
  • the control of the triggering readiness of the pyrotechnical switching device is inventively effected in that the ratchet wheel, which is brought into a position in conformity with the prevailing belt strap withdrawal, acts via a switching contour formed thereon upon the contact pin of an electric switch, whereby the electric switch fixes the triggering readiness of the pyrotechnical switching device in the sense previously described. In so doing, a straightforward construction and a reliable operation of the inventively equipped belt roll-up mechanism is ensured.
  • one embodiment of the invention provides that, proceeding from the position of the ratchet wheel that is provided when the belt strap is fully wound up, the switching contour has a first portion for the contact of the contact pin, which in this position effects the deactivation of the triggering of the pyrotechnical switching device, and a second portion that adjoins the first portion and that, upon rotation of the belt shaft, is traveled over by the contact pin, whereby in the position of the contact pin where it rests against the second portion of the switching contour, the pyrotechnical switching device can be triggered, and has a third portion of the switching contour that adjoins the second portion for contacting the contact pin, and the contact pin, in its position where it rests against the third portion of the switching contour, deactivates the triggering of the pyrotechnical switching device.
  • the switching contour By dividing the switching contour into three portions, consideration is given to the circumstance that where the belt strap is entirely removed or withdrawn only slightly, no triggering of the pyrotechnical switching device is to be effected. If the belt strap is withdrawn to an extent that is customary for smaller vehicle occupants, then, via the appropriate position of the contact pin that rests against the switching contour, the triggering readiness of the pyrotechnical switching device is brought about, so that when an accident is sensed, the switching device becomes operative. If the belt strap is withdrawn further by large vehicle occupants, the contact pin moves along the third portion of the switching contour, and in this position the triggering readiness of the pyrotechnical switching device is again deactivated, so that the force limitation level, which is set high, becomes effective.
  • FIG. 1 shows in a side view the system side of a safety belt roll-up mechanism with control of the force limitation device
  • FIG. 2 in an enlarged view, shows the ratchet wheel as a component of the control.
  • a known belt winder or roll-up mechanism is provided with a U-shaped housing, in the lateral housing plates of which, of which one housing plate 10 can be seen in FIG. 1, there is mounted a belt shaft 11 .
  • the belt shaft 11 is provided with a shaft gear wheel 13 that is fixedly connected therewith.
  • a sensor 12 Disposed on the lateral housing plate 10 is a sensor 12 that reacts to the vehicle, and the function of which, for self-blocking belt roll-up mechanisms, is adequately known from the state of the art.
  • a gear mechanism 14 Connected to the externally toothed shaft gear wheel 13 is a gear mechanism 14 that is comprised of a plurality of gears and by means of which the ALR-ELR changeover of a belt roll-up mechanism can be controlled, whereby this function also is not of importance for the explanation of the present invention, and can be selectively realized or not on an inventively embodied, self-blocking, roll-up mechanism.
  • a reduction gear mechanism 15 that comprises two further gears, be connected to the shaft gear wheel 13 ; the reduction gear mechanism acts upon a ratchet wheel 16 that is rotatably mounted on the housing plate 10 .
  • the ratchet wheel 16 is provided with an external toothing 20 over a portion of its outer periphery.
  • an electric switch 17 Associated with the ratchet wheel 16 is an electric switch 17 , out of which projects a switching pin 25 that is illustrated in FIG.
  • the belt roll-up mechanism is furthermore provided with a connector 19 for an energy supply line coming from the vehicle.
  • the switching contour 21 which is formed over a portion of the periphery of the ratchet wheel 16 , has three zones, namely a first zone 22 , a second zone 23 and a third zone 24 , whereby when the ratchet wheel 16 is pivoted, the stationary switching or contact pin 25 that rests against the ratchet wheel travels over these zones 22 , 23 , 24 .
  • the arrangement of the ratchet wheel 16 is such that in the first zone 22 , a position of the switching pin 25 is effected in which the electric switch 17 establishes a deactivation of the pyrotechnical switching device, so that if an accident is sensed, the pyrotechnical switching device is not triggered.
  • This first zone 22 corresponds to a position of the belt shaft 11 where the belt strap is entirely or nearly entirely wound up, in other words, where the safety belt is not being worn or where the belt strap is withdrawn only slightly, and in this belt withdrawal position a triggering of the switching device is not required or not desired.
  • the switching pin If the belt strap is unwound from the belt shaft 11 to an extent that corresponds to the strapped-in length of belt strap for smaller persons, the switching pin, with a belt strap unwound in such a manner, rests against the second zone 23 of the switching contour 21 of the ratchet wheel 16 , and in this position the position of the switching pin 25 effects an activation of the triggering readiness or operation in such a manner that when an accident is sensed, the pyrotechnical switching device is now triggered and thereby the clamping situation of the torque rod is altered in such a way that a lower force limitation level results.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automotive Seat Belt Assembly (AREA)
  • Emergency Lowering Means (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
US10/478,933 2001-05-31 2002-05-25 Safety belt winder comprising a power limitation system which can be actuated according to the strip of belt pulled out Abandoned US20040188995A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/583,293 US7690688B2 (en) 2001-05-31 2006-09-01 Safety belt roll-up mechanism having a force limitation device actuatable as a function of the length of belt strap withdrawn

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE20109114U DE20109114U1 (de) 2001-05-31 2001-05-31 Sicherheitsgurtaufroller mit einer in Abhängigkeit vom Gurtbandauszug schaltbaren Kraftbegrenzungseinrichtung
DE20109114.3 2001-05-31
PCT/EP2002/005765 WO2002096724A1 (de) 2001-05-31 2002-05-25 Sicherheitsgurtaufroller mit einer in abhängigkeit vom gurtbandauszug schaltbaren kraftbegrenzungseinrichtung

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/583,293 Continuation-In-Part US7690688B2 (en) 2001-05-31 2006-09-01 Safety belt roll-up mechanism having a force limitation device actuatable as a function of the length of belt strap withdrawn

Publications (1)

Publication Number Publication Date
US20040188995A1 true US20040188995A1 (en) 2004-09-30

Family

ID=7957571

Family Applications (2)

Application Number Title Priority Date Filing Date
US10/478,933 Abandoned US20040188995A1 (en) 2001-05-31 2002-05-25 Safety belt winder comprising a power limitation system which can be actuated according to the strip of belt pulled out
US11/583,293 Expired - Fee Related US7690688B2 (en) 2001-05-31 2006-09-01 Safety belt roll-up mechanism having a force limitation device actuatable as a function of the length of belt strap withdrawn

Family Applications After (1)

Application Number Title Priority Date Filing Date
US11/583,293 Expired - Fee Related US7690688B2 (en) 2001-05-31 2006-09-01 Safety belt roll-up mechanism having a force limitation device actuatable as a function of the length of belt strap withdrawn

Country Status (6)

Country Link
US (2) US20040188995A1 (ja)
EP (1) EP1414681B1 (ja)
JP (1) JP4135174B2 (ja)
AT (1) ATE300450T1 (ja)
DE (2) DE20109114U1 (ja)
WO (1) WO2002096724A1 (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007007480A1 (ja) 2005-07-14 2007-01-18 Autoliv Development Ab シートベルト装置
US20080315025A1 (en) * 2005-12-19 2008-12-25 Klaus-Peter Singer Seat Belt Retractor with a Belt Extension Controlled Force Limiting
US20140042257A1 (en) * 2011-04-01 2014-02-13 Autoliv Development Ab Seat Belt Retractor Having an Inertia Sensor With a Pivotal Sensor Housing
US20230001882A1 (en) * 2019-11-26 2023-01-05 Autoliv Development Ab Seat-belt retractor

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007026128A1 (de) * 2006-11-02 2008-05-08 Trw Automotive Gmbh Gurtaufroller
US7946519B2 (en) * 2008-11-12 2011-05-24 Tk Holdings Inc. Pretensioned retractor
JP5420264B2 (ja) * 2009-02-12 2014-02-19 テイ・エス テック株式会社 車両用シート
US20100213302A1 (en) * 2009-02-26 2010-08-26 Tk Holdings Inc. Retractor assembly
DE102009011091B4 (de) * 2009-03-03 2017-02-23 Autoliv Development Ab Gurtaufroller mit einer Einrichtung zur Sensierung der Gurtbandauszugslänge
DE102012209355B4 (de) * 2012-06-04 2014-10-09 Autoliv Development Ab Gurtaufroller mit einer Kraftbegrenzungseinrichtung
US9150193B2 (en) 2012-06-14 2015-10-06 Autoliv Asp, Inc. Mode detection switch assembly for self-locking dual-mode seat belt retractor
DE112017001925B4 (de) * 2016-04-06 2020-12-17 Zf Automotive Germany Gmbh Stellantrieb zum Freigeben eines Kraftbegrenzers eines Gurtaufrollers für einen Fahrzeug-Sicherheitsgurt sowie Gurtaufroller mit einem solchen Stellantrieb
DE102016007375A1 (de) * 2016-06-16 2017-12-21 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Gurtautomat

Citations (9)

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US4456196A (en) * 1980-03-07 1984-06-26 Nissan Motor Co., Ltd. Seat belt retractor with a tension eliminator
US5294070A (en) * 1992-01-31 1994-03-15 Fuji Autolib Co., Ltd. Seat belt retractor
US5887814A (en) * 1996-10-17 1999-03-30 Nsk Ltd. Seat belt retractor and controlling method of the same
US6405959B1 (en) * 1999-02-24 2002-06-18 Takata (Europe) Vehicle Safety Technology Gmbh Safety belt with belt tautener
US6499554B1 (en) * 1999-08-06 2002-12-31 Hideaki Yano Seat belt retractor
US6641078B2 (en) * 2001-09-27 2003-11-04 Breed Automotive Technology, Inc. Seat belt retractor with automatic locking mechanism
US6641076B2 (en) * 1999-12-06 2003-11-04 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Webbing take-up device
US6702056B2 (en) * 1997-08-06 2004-03-09 Takata Corporation Seatbelt retractor
US6832782B2 (en) * 2001-11-19 2004-12-21 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Pretensioner device and seat belt device

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Publication number Priority date Publication date Assignee Title
DE2727470A1 (de) 1977-06-18 1979-01-04 Volkswagenwerk Ag Sicherheitsgurteinrichtung fuer fahrzeuge, insbesondere kraftfahrzeuge
BR9709962A (pt) * 1996-06-26 1999-08-10 Autoliv Dev Dispositivo enrolador de cinta com dispositivo de limitação de força ajustável
DE29820086U1 (de) * 1998-11-10 1999-04-01 Trw Repa Gmbh Gurtaufroller für einen Fahrzeug-Sicherheitsgurt
DE29821801U1 (de) * 1998-12-07 1999-04-08 Trw Repa Gmbh Gurtaufroller für einen Fahrzeug-Sicherheitsgurt

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4456196A (en) * 1980-03-07 1984-06-26 Nissan Motor Co., Ltd. Seat belt retractor with a tension eliminator
US5294070A (en) * 1992-01-31 1994-03-15 Fuji Autolib Co., Ltd. Seat belt retractor
US5887814A (en) * 1996-10-17 1999-03-30 Nsk Ltd. Seat belt retractor and controlling method of the same
US6702056B2 (en) * 1997-08-06 2004-03-09 Takata Corporation Seatbelt retractor
US6405959B1 (en) * 1999-02-24 2002-06-18 Takata (Europe) Vehicle Safety Technology Gmbh Safety belt with belt tautener
US6499554B1 (en) * 1999-08-06 2002-12-31 Hideaki Yano Seat belt retractor
US6641076B2 (en) * 1999-12-06 2003-11-04 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Webbing take-up device
US6641078B2 (en) * 2001-09-27 2003-11-04 Breed Automotive Technology, Inc. Seat belt retractor with automatic locking mechanism
US6832782B2 (en) * 2001-11-19 2004-12-21 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Pretensioner device and seat belt device

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007007480A1 (ja) 2005-07-14 2007-01-18 Autoliv Development Ab シートベルト装置
EP1908651A1 (en) * 2005-07-14 2008-04-09 Autoliv Development AB Seatbelt device
EP1908651A4 (en) * 2005-07-14 2012-10-31 Autoliv Dev SAFETY DEVICE
US20080315025A1 (en) * 2005-12-19 2008-12-25 Klaus-Peter Singer Seat Belt Retractor with a Belt Extension Controlled Force Limiting
US8123154B2 (en) * 2005-12-19 2012-02-28 Autoliv Development Ab Seat belt retractor with a belt extension controlled force limiting
US20140042257A1 (en) * 2011-04-01 2014-02-13 Autoliv Development Ab Seat Belt Retractor Having an Inertia Sensor With a Pivotal Sensor Housing
US9346434B2 (en) * 2011-04-01 2016-05-24 Autoliv Development Ab Seat belt retractor having an inertia sensor with a pivotal sensor housing
US20230001882A1 (en) * 2019-11-26 2023-01-05 Autoliv Development Ab Seat-belt retractor
US11866000B2 (en) * 2019-11-26 2024-01-09 Autoliv Development Ab Seat-belt retractor

Also Published As

Publication number Publication date
EP1414681A1 (de) 2004-05-06
DE50203776D1 (de) 2005-09-01
JP4135174B2 (ja) 2008-08-20
EP1414681B1 (de) 2005-07-27
DE20109114U1 (de) 2001-09-27
US20070145175A1 (en) 2007-06-28
ATE300450T1 (de) 2005-08-15
JP2004521016A (ja) 2004-07-15
WO2002096724A1 (de) 2002-12-05
US7690688B2 (en) 2010-04-06

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AS Assignment

Owner name: AUTOLIV DEVELOPMENT AB, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CLUTE, GUNTER;REEL/FRAME:015439/0654

Effective date: 20031204

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION