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WO2005066001A1 - Dispositif de pre-tension avec organes d'actionnement de type chaine et procede de pre-tension - Google Patents

Dispositif de pre-tension avec organes d'actionnement de type chaine et procede de pre-tension Download PDF

Info

Publication number
WO2005066001A1
WO2005066001A1 PCT/IB2003/006327 IB0306327W WO2005066001A1 WO 2005066001 A1 WO2005066001 A1 WO 2005066001A1 IB 0306327 W IB0306327 W IB 0306327W WO 2005066001 A1 WO2005066001 A1 WO 2005066001A1
Authority
WO
WIPO (PCT)
Prior art keywords
actuating
actuating bodies
bodies
chain
pretensioner
Prior art date
Application number
PCT/IB2003/006327
Other languages
English (en)
Inventor
Bijon Nag
Sudarsanam Rangarajan
Vijay Krishnappa Shetty
Original Assignee
Autoliv Ifb India Pvt Limited
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 Ifb India Pvt Limited filed Critical Autoliv Ifb India Pvt Limited
Priority to AU2003288685A priority Critical patent/AU2003288685A1/en
Priority to PCT/IB2003/006327 priority patent/WO2005066001A1/fr
Priority to CNA2003801110460A priority patent/CN1980823A/zh
Priority to MYPI20045345A priority patent/MY141100A/en
Priority to TW093140183A priority patent/TW200528321A/zh
Publication of WO2005066001A1 publication Critical patent/WO2005066001A1/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
    • B60R2022/4647—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 the driving means being a belt, a chain or the like

Definitions

  • the present invention relates to a pretensioner device for seat belts.
  • the present invention particularly relates to a pretensioner device with actuating bodies forming a chain on actuation, to provide a drive for the retraction of seat belt.
  • the present invention also provides a method of pretensioning by adopting chain-like actuating bodies.
  • Background and prior art Seat belt devices of automobiles having pretensioning devices are used to restrain the occupant to the seat in a vehicle in the event of a sudden impact or an accident.
  • a pretensioning device applies tension to the seat belt, on sudden deceleration of a vehicle, by rapidly rotating the shaft of the pretensioning device on which the web of the seat belt is wound, thereby restraining the occupant to the seat.
  • a pyrotechnical charge is detonated in the event of sudden impact of a vehicle, to provide energy for actuating the driving means that are generally selected from a series of balls, gears, chain etc. for rapid rotation of the webbing of a seat belt.
  • US Patent 4,444,010 disclose a pretensioner with bullet shaped actuating bodies to turn a drive member after activation. The spindle connected to the drive member is turned backwards and to retract the belt into the retractor. The transfer of the energy from the actuating body to the drive member occurs by friction. The efficiency of this system is not advantageous, because the jammed acceleration bodies have to be removed by the wedge shaped baffle after use.
  • US Patent 3,552,222 A special drive wheel for retracting the seat belt is shown in US Patent 3,552,222, which is complicated to produce and therefore expensive.
  • US Patent 5,590,295 discloses a drive member, combined out of two drive wheels having semi-spherical recesses.
  • a relatively good transfer of energy from actuating body to drive mechanism can be arranged with a chain, as shown in DE 3220498 and WO 97/13661(PCT/US96/16577).
  • This patent further discloses a flexible chain located within the drive housing including a plurality of interconnected chain links for driving the gear wheel. But in case of chain driven pretensioning device, the main disadvantage is that actuating bodies are fixed to each other to form a chain.
  • a chain thus formed cannot not be stored in a small container (reservoir) of a pretensioning device, as a single part after pretensioning of the seat belt, which is possible when balls are used as driving means. Therefore, there is a need for a big reservoir or a channel in a pretensioning device to store the chain subsequent to pretensioning of the seat belt. As a result, a compact design for a pretensioning device is not possible.
  • the main object of the present invention is to provide a compact pretensioning device with actuating bodies acting as chain only under pressure during activation.
  • An object of the present invention is to provide a wider surface contact area between the pinion (the receives drive from actuating bodies) and the actuating bodies for an effective transfer of energy from actuating bodies to pinion for rotating the shaft on which seat belt webbing is wound.
  • Another object of the present invention is to provide a compact pretensioning device with actuating bodies are positioned loosely adjacent to each other in the channel when the device is not in use.
  • Yet another object of the present invention is to provide a compact pretensioning device where the actuating bodies are cylindrical in shape.
  • a pretensioning device for a seat belt is connected to an emergency locking retractor (ELR) consisting of a frame and a spindle rotatably supported in the frame.
  • ELR emergency locking retractor
  • One end of the seat belt is connected to the spindle.
  • a pinion (driven member) is connected to the spindle.
  • a housing connected to the frame has a channel extending in the plane parallel to the radial plane of the pinion and extending at least partially about a circumference of the pinion.
  • actuating bodies having cylindrical shapes are positioned loosely adjacent to each other in the channel, to act as chain on activation to provide rotary drive to the pinion.
  • the rotary drive of the pinion turns the spindle in a backward rotation and pull in the webbing, so that the occupant of a seat is secured by a tightened seatbelt.
  • the present invention also provides a method of pretensioning by adopting chain-like actuating bodies.
  • Figure 1 depicts a sectional view of pretensioning device with loosely arranged actuating bodies prior to pretensioning.
  • Figure 2 is a sectional view of a pretensioner with actuating bodies moving like a chain during pretensioning and the detachment of actuating bodies after pretensioning.
  • Figure 3, 4 and 5 depict the cylindrical actuating bodies both as a single entity and in the form of chain.
  • Figure 6 depicts a view of meshing arrangement of actuating bodies with the pinion of the pretensioner to provide an effective transfer of drive from the actuating bodies.
  • Figure 7 shows the advantage of cylindrical shaped actuating bodies over the spherical actuating bodies.
  • a retractor 1 is mounted on a frame 12 of the vehicle body having a housing 8.
  • the housing 8 is made up of die casting metal.
  • a webbing of the seat belt 13 is wound on a spindle 3 of the retractor 1 (which is not shown in this figure), and is stretched towards webbing pull-out direction 14 whenever the user wears the belt while seated.
  • the spindle 3 is connected to the pinion 4 of the pretensioning device 2 by means of clutch (not shown in fig).
  • a channel 7 is provided which extends in the plane parallel to the radial plane of pinion 4.
  • a gas generator 17 is disposed at one end of the channel 7, to provide a pyrotechnical charge on sudden impact.
  • a gas inlet 18 is provided in the channel 7 to permit the gas to enter into channel 7.
  • a plurality of actuating bodies 10 positioned loosely adjacent to each other in the channel when the device is not in use.
  • the last actuating body 6 is disposed in the channel 7 in close proximity to the gas generator 17 to receive the pyrotechnical charge from the gas generator 17.
  • the seal (not shown in fig) of the last actuating body 6 prevents the products of combustion (pyrotechnical charge) from escaping the channel 7.
  • the channel 7 acts as a conduit to the actuating bodies 10 and further provides a rotary path to the chain of actuating bodies 10 when they are in rapid motion on receiving the drive as a result of the pyrotechnical charge generated by the gas generator 17 on sudden impact.
  • the actuating bodies 10 are positioned in the channel 7 by abutting to one another and are held in position with the help of stopper 11 when they are in idle condition.
  • the actuating bodies 10 that are disposed in the channel 7 are led around the pinion 4 to form an angle 5 so that always a pair of actuating bodies 10 is meshed with the teeth profile of the pinion 4 to ensure that transfer the energy generated by the moving chain of actuating bodies 10 is transferred onto the pinion 4 at a given point of time.
  • the actuating bodies 10 on receiving a charge from the ignition of the gas generator 17 form a chain of actuating bodies 10 while rapidly moving along the channel 7, which extends in the plane parallel to the radial plane of pinion 4.
  • the present Figure also demonstrates the formation of chain of actuating bodies 10.
  • the working section 23 is the outer diameter of the body, running in the channel 7 (Figs 1 &2).
  • a pair of spindle shaped protuberances 22, one each on either side of the working section 23 of the actuating bodies is formed.
  • Each of these spindle shaped protuberances 22 terminates with a rotator-cuff shaped head 19 on one side and as a stem 21 on the other side on the working section 23.
  • a semi-circular inner contact surface in the form of a recess 20 on the stem side is carved out of the opposite ends of each of the actuating bodies.
  • the rotator-cuff shaped heads 22 of one actuating body pivots into inner contact surfaces 20 of the next actuating body to form a consecutive chain of actuating bodies 10 on application of pressure generated by the pyrotechnical charge of gas generator 17.
  • This chain of actuating bodies 10 provide a rotary drive to the pinion 4 which in turn rotates the spindle 3 having a clutch means, to effect a rapid retraction of the seat belt.
  • the rotary drive of the pinion 4 is enabled by meshing the teeth profile of the pinion 4 with the intervening working areas 23 of two adjacent actuating bodies.
  • Figure 4 is a disclosure of an alternate actuating body 24 resembling a dumbbell, wherein the outer diameter 25 is carved with a concave recesses 20 that come in contact with the outer contact surface 19 of the neighboring actuating body 24.
  • the working section 23 has a smaller diameter than the outer diameter 25 to enable a good encompass of the teeth of the pinion 4.
  • the rotary drive of the pinion 4 is enabled by meshing with the teeth profile of the pinion 4 with the intervening working areas 23 of two adjacent actuating bodies.
  • an alternate actuating body 26 with an outer diameter in the shape of dumb-bell having contact surface 27 and the working section 23.
  • actuating bodies 24 and 26 as shown in Figure 4 and Figure 5 are alternate actuating bodies to the ones as disclosed in Figures 1-3.
  • the rotary drive of the pinion 4 is enabled by meshing with the teeth profile of the pinion 4 with the intervening working areas 23 of two adjacent actuating bodies.
  • Figure 6 depicts an embodiment, wherein the loosely connected actuating bodies 10 are meshed with the gear profile of the pinion 4 to provide a rotary drive to pinion 4 on pretensioning.
  • the force F applied from the chain-like actuating body to the tooth of the pinion 4 is more in the line of the movement direction and influence a lower resultant force R onto the wall of the channel, resulting in less friction when compared with the actuating bodies that are in spherical shapes.
  • the functional aspects of the pretensioning device of the present invention are described in the following embodiments Upon sensing an emergency condition, for instance in the case of sudden impact of the vehicle, the electric signal is sent to initiator of pyrotechnic charge to produce products of combustion (pyrotechnical charge), which propels the last actuating body 6, which in turn accelerate the other actuating bodies 10.
  • the seal of the last mass body prevents the products of combustion from escaping from the chamber.
  • the last actuating body 6 is propelled through the channel 7 and in doing so pushes the chain-like actuating bodies 10 thus formed as a result of drive generated through the channel 7.
  • the channel 7 guides the accelerated chain of actuating bodies 10.
  • Each of the actuating bodies 10 moves past the outer gear profile of the pinion 4 by engaging the gear profile of the pinion 4, for short period of time.
  • the engagement of working section 23 of the actuating bodies 10 with the gear profile of the pinion 4 provides a complimentary radial drive to the spindle 3.
  • the webbing 13 wound on the spindle 3 retracts a determinable amount of webbing back to tighten the seat belt securely to the occupant.
  • the present invention provides a pretensioner for retracting the seat belt, having a detachable chain-like actuating bodies, said pretensioner comprising a pretensioner housing, a rotatable pinion with an outer gear profile mounted on a rotatable spindle is disposed in the pretensioner housing, a webbing of the seat belt wound on the spindle, a channel disposed in said housing to provide a guiding path for the rapid movement of said chain-like actuating bodies, the actuating bodies consisting of a working area and a pair of projections mounted on either side of their lateral outer edges, each of said projections having a stem and a head, a pair of concave sockets are carved out on the bottom ends of the stems of actuating bodies to form a semi-circular recesses, a chain formed with plurality of actuating bodies by loosely pivoting the head of one actuating body to the semi-circular recesses of adjacent actuating body, intervening gaps formed in the
  • actuating bodies having an outer diameter in the form of a cylinder comes in contact with the gear profile of the pinion on application of pressure.
  • actuating bodies are positioned in an angle whereby two actuating members are simultaneously in contact with the outer teeth profile of the pinion even when the pretensioner is in idle position.
  • the intervening gap thus formed as a result of chain-like actuating bodies, is used to mesh with the outer gear profile of pinion.
  • optional actuating bodies are selected from cylindrical shaped bodies with circular outer diameter or an outer diameter with concave surfaces.
  • a method of pretensioning of seat belt is disclosed by using the pretensioner of the present invention said method comprising the steps of: powering the loosely connected actuating bodies to rapidly move and to form chain-like actuating bodies on pyrotechnical charge, driving the pinion mounted on the spindle by engaging the moving chain-like actuating bodies with the outer gear profile of the pinion, retracting the seat belt by rotating the spindle, detaching the actuating bodies automatically on pretensioning, and storing the detached actuating bodies in the reservoir.
  • a method wherein the chain of actuating bodies is detachable automatically on pretensioning. It is also an embodiment of the present invention, wherein the force applied by the actuating body to the tooth of the pinion is more in the line of movement of the actuating bodies and thereby resulting in lower resultant resistance force and friction.
  • the actuating bodies of the present invention act as a chain under pressure to provide the desired force to the teeth profile of the pinion resulting in rotary movement.
  • the actuating bodies of the present invention act as a chain under pressure reduce the resultant force acting on the channel while in use, therefore providing a less frictional movement of the actuating bodies as compared with balls.
  • the pretensioning device of the present invention provides a simple storage area for storing the actuating bodies after their use. As a result no increase in the shape of the retractor.
  • the actuating bodies adopted in the present invention have a secured distance (axis base) to each other and an advantageous shape (cylindrical) for driving a simple and inexpensive drive wheel like a pinion.

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

Abstract

La présente invention concerne un dispositif de pré-tension destiné à une ceinture de sécurité. Cette invention concerne aussi un dispositif de pré tension avec des organes d'actionnement formant une chaîne lors d'un actionnement de façon à produire un entraînement de la rétractation de la ceinture de sécurité, ces organes d'actionnement étant détachés sous forme d'unités individuelles lors de la pré-tension de cette ceinture de sécurité. Cette invention concerne aussi un procédé de pré tension utilisant ses organes d'actionnement de type chaîne.
PCT/IB2003/006327 2003-12-23 2003-12-23 Dispositif de pre-tension avec organes d'actionnement de type chaine et procede de pre-tension WO2005066001A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AU2003288685A AU2003288685A1 (en) 2003-12-23 2003-12-23 A pretensioner with chain-like actuating bodies and a method of pretensioning
PCT/IB2003/006327 WO2005066001A1 (fr) 2003-12-23 2003-12-23 Dispositif de pre-tension avec organes d'actionnement de type chaine et procede de pre-tension
CNA2003801110460A CN1980823A (zh) 2003-12-23 2003-12-23 具有链状致动体的预张紧器和预张紧方法
MYPI20045345A MY141100A (en) 2003-12-23 2004-12-23 A pretensioner with chain-like actuating bodies and a method of pretensioning.
TW093140183A TW200528321A (en) 2003-12-23 2004-12-23 A pretensioner with chain-like actuating bodies and a method of pretensioning

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2003/006327 WO2005066001A1 (fr) 2003-12-23 2003-12-23 Dispositif de pre-tension avec organes d'actionnement de type chaine et procede de pre-tension

Publications (1)

Publication Number Publication Date
WO2005066001A1 true WO2005066001A1 (fr) 2005-07-21

Family

ID=34746639

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2003/006327 WO2005066001A1 (fr) 2003-12-23 2003-12-23 Dispositif de pre-tension avec organes d'actionnement de type chaine et procede de pre-tension

Country Status (5)

Country Link
CN (1) CN1980823A (fr)
AU (1) AU2003288685A1 (fr)
MY (1) MY141100A (fr)
TW (1) TW200528321A (fr)
WO (1) WO2005066001A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007012103A1 (fr) * 2005-07-27 2007-02-01 Albert Kinzel Dispositif pour tendre des ceintures de securite
DE102007040254A1 (de) 2007-08-23 2009-02-26 Adomeit, Heinz-Dieter, Dr.-Ing. Antriebseinrichtung zur Erzeugung einer Gurtstraffbewegung in einer Sicherheitsgurtvorrichtung
WO2012143090A1 (fr) * 2011-04-05 2012-10-26 Trw Automotive Gmbh Enrouleur de ceinture
EP2463161A3 (fr) * 2010-12-13 2014-05-07 Takata Corporation Prétendeur, rétracteur de ceinture avec le prétendeur et appareil de ceinture avec le rétracteur de ceinture
JP2017218083A (ja) * 2016-06-09 2017-12-14 株式会社東海理化電機製作所 ウェビング巻取装置
WO2017213239A1 (fr) * 2016-06-09 2017-12-14 株式会社東海理化電機製作所 Dispositif enrouleur de sangle
JP2017218088A (ja) * 2016-06-09 2017-12-14 株式会社東海理化電機製作所 ウェビング巻取装置
US20180178752A1 (en) * 2016-12-28 2018-06-28 Takata Corporation Pretensioner, seatbelt retractor, seatbelt device, and method of manufacturing pretensioner

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101554754B (zh) * 2009-03-26 2011-09-07 山东大学 一种绳带均衡张紧装置
DE102010033184A1 (de) * 2010-08-03 2011-07-07 Takata-Petri Ag, 63743 Gurtaufroller mit Strafferantrieb
DE102010051419A1 (de) * 2010-11-17 2012-05-24 Trw Automotive Gmbh Antriebsrad für Gurtstraffer und Gurtstraffer für Sicherheitsgurtsystem
CN103832398B (zh) * 2014-02-27 2017-11-03 上海和励信息科技有限公司 用于预紧式安全装置的驱动链条及其组件、安装装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2359284A (en) * 1997-04-18 2001-08-22 Breed Automotive Technologies A chain pretensioner

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2359284A (en) * 1997-04-18 2001-08-22 Breed Automotive Technologies A chain pretensioner

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007012103A1 (fr) * 2005-07-27 2007-02-01 Albert Kinzel Dispositif pour tendre des ceintures de securite
DE102007040254A1 (de) 2007-08-23 2009-02-26 Adomeit, Heinz-Dieter, Dr.-Ing. Antriebseinrichtung zur Erzeugung einer Gurtstraffbewegung in einer Sicherheitsgurtvorrichtung
EP2463161A3 (fr) * 2010-12-13 2014-05-07 Takata Corporation Prétendeur, rétracteur de ceinture avec le prétendeur et appareil de ceinture avec le rétracteur de ceinture
WO2012143090A1 (fr) * 2011-04-05 2012-10-26 Trw Automotive Gmbh Enrouleur de ceinture
DE112012001607B4 (de) 2011-04-05 2018-08-16 Trw Automotive Gmbh Gurtaufroller
US9908503B2 (en) 2011-04-05 2018-03-06 Trw Automotive Gmbh Seatbelt retractor
JP2017218088A (ja) * 2016-06-09 2017-12-14 株式会社東海理化電機製作所 ウェビング巻取装置
WO2017213240A1 (fr) * 2016-06-09 2017-12-14 株式会社東海理化電機製作所 Dispositif d'enroulement de sangle
JP2017218087A (ja) * 2016-06-09 2017-12-14 株式会社東海理化電機製作所 ウェビング巻取装置
WO2017213238A1 (fr) * 2016-06-09 2017-12-14 株式会社東海理化電機製作所 Dispositif enrouleur de ceinture de sécurité
WO2017213239A1 (fr) * 2016-06-09 2017-12-14 株式会社東海理化電機製作所 Dispositif enrouleur de sangle
JP2017218083A (ja) * 2016-06-09 2017-12-14 株式会社東海理化電機製作所 ウェビング巻取装置
US20180178752A1 (en) * 2016-12-28 2018-06-28 Takata Corporation Pretensioner, seatbelt retractor, seatbelt device, and method of manufacturing pretensioner
US10549715B2 (en) * 2016-12-28 2020-02-04 Joyson Safety Systems Japan K.K. Pretensioner, seatbelt retractor, seatbelt device, and method of manufacturing pretensioner

Also Published As

Publication number Publication date
TW200528321A (en) 2005-09-01
CN1980823A (zh) 2007-06-13
MY141100A (en) 2010-03-15
AU2003288685A1 (en) 2005-08-12

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