WO2011044997A1 - Dispositif tendeur pour un enrouleur de ceinture d'une ceinture de sécurité - Google Patents

Dispositif tendeur pour un enrouleur de ceinture d'une ceinture de sécurité Download PDF

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Publication number
WO2011044997A1
WO2011044997A1 PCT/EP2010/006080 EP2010006080W WO2011044997A1 WO 2011044997 A1 WO2011044997 A1 WO 2011044997A1 EP 2010006080 W EP2010006080 W EP 2010006080W WO 2011044997 A1 WO2011044997 A1 WO 2011044997A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
tube
sealing lip
pressure chamber
belt
Prior art date
Application number
PCT/EP2010/006080
Other languages
German (de)
English (en)
Inventor
Thomas Schmidt
Martin Schmidt
Christian Fischer
Michael Pech
Hans-Otto Kock
Simone Mesecke-Rischmann
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
Priority to CN201080046531.4A priority Critical patent/CN102574500B/zh
Publication of WO2011044997A1 publication Critical patent/WO2011044997A1/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
    • B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
    • 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

Definitions

  • the invention relates to a tightening device for a belt retractor of a safety belt, in particular in a motor vehicle, according to the preamble of claim 1.
  • a generic Straffervorraum which has a drive from guided in a tube mass bodies, which are driven by means of a pressure generated by a pyrotechnic gas generator.
  • a piston At the first mass body facing the gas generator is located on a piston which closes a pressure chamber which can be acted upon by the gas generator with a pressure.
  • the piston is formed as a hollow thin-walled cup-shaped deep-drawn part and is located with a concavity on the first mass body and closes the pressure chamber via a line-shaped sealing edge, which rests against the inside of the tube.
  • a disadvantage of this piston is the fact that it is made as a deep-drawn part made of steel, and the sealing edge is therefore relatively stiff and can lose contact with the inner wall of the tube in a curved pipe run. In the event that the sealing edge does not abut against the inner wall of the tube, a portion of the gas from the pressure chamber past the piston, whereby the tightening performance and the efficiency decrease.
  • an increased flexibility of the sealing edge can only be achieved to a limited extent with the proposed design, since the piston has a substantially constant wall thickness and the wall thickness can not be selected too low, since otherwise the piston would not have the necessary strength. having activity for transmitting the drive power.
  • Another disadvantage of this solution is that in case of damage to the piston there is a risk that the tightening movement can be disturbed or even blocked by the penetration of parts of the piston in the gap between the mass body and the tube inner wall.
  • the object of the invention is therefore to provide a tightening device with increased functional reliability and a high tensioning performance at a high level of efficiency.
  • the piston is formed from a dimensionally stable base body, -the base body is dimensioned such that between the main body and the inner wall of the tube, a gap is present, and
  • -an is provided on the base body a circumferential radially outwardly expanding in the direction of the pressure chamber directed on the inner wall of the tube fitting sealing lip.
  • the advantage of the improved piston according to the invention is to be seen in that the piston in its basic structure has two different sections in their function, which can be optimally designed independently of each other according to their function.
  • the dimensionally stable base body serves to transmit power to the first mass body and is accordingly provided with a required strength for power transmission.
  • the sealing function on the inner wall of the Pipe is realized by a sealing lip, which has the required flexibility, so that it rests sealingly against the inner wall in a curved pipe run.
  • the different properties of the base body and the sealing lip can be achieved by a different wall thickness. Since the dimensionally stable body itself has no sealing function, it is deliberately dimensioned so that there is a gap between it and the inner wall of the tube.
  • the existing gap ensures that the piston in the curved tube course is not clamped by abutment of the main body on the inner wall of the tube, such as in a misalignment of the piston, and reduces the tightening performance by increased friction. Due to the proposed orientation of the sealing lip, it is possible that the sealing lip is bent in the curved tube on one side radially inwardly, while it can spring radially outwardly on the opposite side and thereby rests in this position on all sides on the inner wall of the tube.
  • Fig. 1 belt retractor with a tensioner device with mass body drive
  • Fig. 2 piston in the system on the first mass body in
  • the belt retractor shown schematically in Fig. 1 comprises a housing 11 with side legs 13, a therein stored Gurtaufwickelwelle 12 for an unillustrated seat belt webbing and acting on the Gurtaufwickelwelle 12 triggering device 10.
  • the Straffervoriques 10 comprises a rotatably connected to the Gurtaufwickelwelle 12 drive wheel 14, which has, for example, an external toothing 15, a particular pyrotechnic gas generator 17 for generating a gas pressure, and a gas generator 17 with the Gurtauf ickelwelle 12 via the drive wheel 14 connecting pipe 16.
  • the tube 16 is formed by a tube wall 24, the part of Housing 11 or alternatively may be a separate component.
  • a number of particular metallic balls 19 for transmitting the gas pressure generated by the gas generator 17 is provided on the Gurtaufwickelwelle 12 via the drive wheel 14.
  • the belt retractor is not limited in terms of the configuration of the interaction region 18 between the ball row 19 and the drive wheel and any coupling devices between the drive wheel 14 and the Gurtaufwickelwelle 12.
  • the outer diameter of the balls 19 is expediently slightly smaller than the inner diameter of the tube sixteenth
  • piston 21 is further provided, which is advantageously arranged in a region 23 between the gas generator 17 and the ball row 19, that is, immediately before the first ball in the transmission direction 19a ball row 19.
  • the piston 21 closes a pressure chamber 20 which can be acted upon by the gas generator 17 with a gas pressure in the pipe 16, so that it can be driven to a tightening movement when the pressure chamber 20 is pressurized by the gas generator 17.
  • the tightening movement of the piston 21 is transmitted to the belt take-up shaft 12 by the power transmission means formed by the ball row 19 and the drive wheel 14, so that the webbing is tightened.
  • the piston 21 is shown enlarged in the system on the first mass body 19a in the tube 16.
  • the piston 21 is formed from a dimensionally stable base body 22 and a circumferential sealing lip 25 extending in the direction of the pressure chamber 20.
  • the mass body 19 a is formed by a ball with a radius R 1, which is slightly smaller than half the diameter B of the tube 16.
  • the piston 21 has an end face 28 with a concavity of the same radius, against which the mass body 19a rests without gaps with as large an area as possible.
  • the pressure chamber 20 facing the pressure side 27 of the piston 21 is partially spherical shaped with an i- dian radius R2, so that there is a constant distance D between the end face 28 and the pressure side 27, and the base body 22 accordingly has a constant wall thickness in this area ,
  • the outer diameter of the base body 22 is selected smaller than the inner diameter of the tube 16, so that between the inner wall 16 a of the tube 16 and the base body 22, a gap S is present. Overall, the entire base body 22 is within a circle K, which has a smaller diameter than the diameter B of the tube.
  • the piston 21 can be very easily pushed back into the tube 16 by the partially spherical shape of the pressure side 27 after exiting the tube 16 to the end of the tensioning movement by the onset reverse rotation of the drive wheel 14 during a subsequent force-limited Gurtbandauszugsterrorism. It is advantageous that the base body 22 in the basic structure is not beyond a ball K addition, which is equal to or smaller than the mass body 19. The only part of the piston 21 projecting beyond the ball K is the sealing lip 25, which, however, is so thin-walled that it breaks off when the piston 21 is pushed back or does not hinder the movement due to its flexibility.
  • the circumferential sealing lip 25 tapers towards its edge and protrudes from the base body 22 in the direction of the pressure chamber 20 radially outward, where it finally rests with its edge on the inner wall 16 a of the tube 16.
  • the outer diameter of the sealing lip 25 is slightly larger than the inner diameter B of the tube, so that the sealing lip 25 is slightly compressed during installation of the piston 21 and rests with an increased sealing force on the inner wall 16 a of the tube 16.
  • a recess 26 is provided in the form of an annular groove through which in addition to the tapered shape of the sealing lip 25, a radial compression movement of the sealing lip 25th is possible.
  • the piston 21 and the first mass body 19a can be seen in a curved section of the tube 16.
  • the piston 21 is due to the movement and the
  • sealing lip 25 springs in this area radially inwardly.
  • the compression movement of the sealing lip 25 is made possible by the sealing lip 25 itself made of an elastic material, such as. POM (also known as Delrin), is formed, and the wall thickness of the sealing lip 25 decreases toward its radially outer edge.
  • POM also known as Delrin
  • the compression movement is favored by the recess 26, since the sealing lip 25 can thereby be brought down under narrowing of the recess 26 to the base body 22.
  • the sealing lip 25 springs due to the spring bias to the outside, wherein the recess 26 is increased in this area.
  • the advantage of the proposed shaping of the sealing lip 25 is recognizable in that it does not lose contact with the inner wall 16a of the tube 16 even in the illustrated curved section of the tube 16 and thereby perceives its sealing effect. Furthermore, the piston 21 is sealingly guided in the tube 16, without the risk of clamping or Ver Kankantens of the piston 21 is. Furthermore, the resulting friction between the piston 21 and the tube 16 is reduced by the very small contact surface of the sealing lip 25 to a minimum.
  • the piston 21 can be seen with the different functional sections.
  • the main body 22 is further characterized in a contact portion 22a by the ge dashed line I and a central portion 22b characterized by the dashed line II divided.
  • the sealing portion formed by the sealing lip 25 is indicated by the dotted line III.
  • the contact portion 22a serves the largest possible contact with the first mass body 19a on the end face 28 and is formed radially outwardly as a cone 29. Due to the conical shape of the contact portion 22a prevents the piston 21 can pass between the first mass body 19a and the inner wall 16a of the tube 16 even at high load, and ensures that the piston can perform a backward movement during the force-limited Gurtbandauszugsdoch.
  • the central portion 22b is formed substantially cylindrical and provided to the pressure chamber 20 with a part-spherical pressure side 27. Task of the central portion 22b is to provide the necessary dimensional stability of the piston 21 in the transmission of compressive forces on the mass body 19a.
  • the central region 22b is designed to be as short as possible in the longitudinal direction of the piston 21 in the direction of the tensioning movement, so that as little contact friction as possible occurs between the central region 22b and the inner wall 16a of the tube 16, and the contact of the central region 22b also in a curved section of the tube 16 is avoided as possible.
  • the task of the sealing section, formed by the sealing lip 25, is to seal the piston 21 with respect to the pressure chamber 20 during the entire tightening movement. The resulting frictional forces should be as small as possible by the movement of the voltage applied to the inner wall 16a sealing lip 25.
  • the sealing lip 25 should hinder the pushing back of the end of the tensioning movement from the tube 16 leaked piston 21 at the onset of force-limited Gurtbandauszugsschi back into the tube 16 as little as possible.
  • a particular advantage resulting indirectly from the invention is that the piston 21 can be manufactured as a cost-effective and lightweight injection molded part.

Landscapes

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

Abstract

L'invention concerne un dispositif tendeur (10) pour un enrouleur de ceinture d'une ceinture de sécurité, en particulier dans des véhicules automobiles. Ledit dispositif tendeur comprenant : un boîtier (11) et un arbre d'enroulement de ceinture (12) monté rotatif dans le boîtier (11), un dispositif d'entraînement destiné à entraîner l'arbre d'enroulement de ceinture (12) dans la direction d'enroulement, une pluralité de corps de masse (19) guidés dans un tube (16), qui peuvent être mis en prise avec l'arbre d'enroulement de ceinture (12), de manière à transmettre des forces, par l'intermédiaire d'une roue d'entraînement (14). Le dispositif tendeur comprend également un piston (21) qui est guidé de façon mobile dans le tube (16) et ferme une chambre de pression (20) agencée dans le tube (16) qui peut être alimentée en pression par un générateur de gaz pyrotechnique (17), le piston (21) étant constitué d'un corps de base (22) indéformable, dimensionné de telle sorte qu'une fente (S) se trouve entre le corps de base (22) et la paroi intérieure (16a) du tube (16). En outre, une lèvre d'étanchéité circulaire (25) reposant sur la paroi intérieure (16a) du tube (16), s'étendant radialement vers l'extérieur et orientée en direction de la chambre de pression (20), est agencée sur le corps de base (22).
PCT/EP2010/006080 2009-10-15 2010-10-05 Dispositif tendeur pour un enrouleur de ceinture d'une ceinture de sécurité WO2011044997A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201080046531.4A CN102574500B (zh) 2009-10-15 2010-10-05 用于安全带的安全带自动伸缩器的张紧装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009049576.2A DE102009049576B4 (de) 2009-10-15 2009-10-15 Straffervorrichtung für einen Gurtaufroller eines Sicherheitsgurtes
DE102009049576.2 2009-10-15

Publications (1)

Publication Number Publication Date
WO2011044997A1 true WO2011044997A1 (fr) 2011-04-21

Family

ID=43430701

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/006080 WO2011044997A1 (fr) 2009-10-15 2010-10-05 Dispositif tendeur pour un enrouleur de ceinture d'une ceinture de sécurité

Country Status (3)

Country Link
CN (1) CN102574500B (fr)
DE (1) DE102009049576B4 (fr)
WO (1) WO2011044997A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10369963B2 (en) 2017-03-17 2019-08-06 Autoliv Asp, Inc. Seatbelt pretensioning retractor assembly including a gas release opening
US11059452B2 (en) 2017-03-17 2021-07-13 Autoliv Asp, Inc. Seatbelt pretensioning retractor assembly including a gas release opening

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017130631B4 (de) 2017-12-20 2020-07-02 Autoliv Development Ab Gurtstraffer mit einem relativ kleinen ersten Massekörper
DE102018100605B3 (de) * 2018-01-12 2019-03-07 Autoliv Development Ab Gurtstraffer mit gestuftem Rohrinnendurchmesser
TWI741910B (zh) * 2020-12-14 2021-10-01 全興創新科技股份有限公司 用於安全帶裝置的拉緊裝置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10066249B4 (de) * 1999-03-04 2007-07-12 Autoliv Development Ab Sicherheitsgurtsystem
WO2009000417A1 (fr) 2007-06-23 2008-12-31 Autoliv Development Ab Rétracteur de ceinture avec piston d'entraînement en forme de coupe
WO2009124664A1 (fr) * 2008-04-09 2009-10-15 Autoliv Development Ab Dispositif pré-tensionneur pour une ceinture de sécurité

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2931164A1 (de) * 1979-08-01 1981-02-19 Dynamit Nobel Ag Rotationskraftelement
DE3034258C2 (de) * 1980-09-11 1985-11-14 TRW Repa GmbH, 7071 Alfdorf Antriebsvorrichtung
DE19602549B4 (de) * 1995-02-01 2005-09-29 Autoliv Development Ab Massekörperantrieb für einen Rotationsstraffer
GB9609822D0 (en) * 1996-05-10 1996-07-17 Alliedsignal Ltd Pretensioner
JP4136181B2 (ja) * 1999-04-30 2008-08-20 株式会社東海理化電機製作所 ウエビング巻取装置用プリテンショナー
DE102008032371A1 (de) * 2008-03-06 2009-09-10 Trw Automotive Gmbh Gurtstraffer für ein Sicherheitsgurtsystem

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10066249B4 (de) * 1999-03-04 2007-07-12 Autoliv Development Ab Sicherheitsgurtsystem
WO2009000417A1 (fr) 2007-06-23 2008-12-31 Autoliv Development Ab Rétracteur de ceinture avec piston d'entraînement en forme de coupe
WO2009124664A1 (fr) * 2008-04-09 2009-10-15 Autoliv Development Ab Dispositif pré-tensionneur pour une ceinture de sécurité

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10369963B2 (en) 2017-03-17 2019-08-06 Autoliv Asp, Inc. Seatbelt pretensioning retractor assembly including a gas release opening
US11059452B2 (en) 2017-03-17 2021-07-13 Autoliv Asp, Inc. Seatbelt pretensioning retractor assembly including a gas release opening

Also Published As

Publication number Publication date
DE102009049576A1 (de) 2011-04-21
CN102574500A (zh) 2012-07-11
DE102009049576B4 (de) 2016-02-25
CN102574500B (zh) 2016-03-02

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