WO2019057693A1 - Limiteur d'effort pour véhicule automobile - Google Patents

Limiteur d'effort pour véhicule automobile Download PDF

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Publication number
WO2019057693A1
WO2019057693A1 PCT/EP2018/075162 EP2018075162W WO2019057693A1 WO 2019057693 A1 WO2019057693 A1 WO 2019057693A1 EP 2018075162 W EP2018075162 W EP 2018075162W WO 2019057693 A1 WO2019057693 A1 WO 2019057693A1
Authority
WO
WIPO (PCT)
Prior art keywords
oscillating
oscillating part
limiting device
force limiting
toothing
Prior art date
Application number
PCT/EP2018/075162
Other languages
German (de)
English (en)
Inventor
Ronald Jabusch
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 WO2019057693A1 publication Critical patent/WO2019057693A1/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

Definitions

  • the invention relates to a force limiting device for a motor vehicle having the features of the preamble of claim 1.
  • a generic force limiting device which comprises an arrangement of spring-biased oscillating masses.
  • the oscillating masses intervene during the oscillating movement alternately with different teeth in a counter-toothing of a force-limited feed movement exporting part, wherein the feed motion is controlled by the oscillatory movement of the masses. Due to the spring bias, the frequency of the oscillating masses and thus the feed motion and ultimately the force limiting level of the force limiting device can be changed.
  • the damping constants and the force limiting level dependent thereon are determined by the geometry of the teeth, the mass of the oscillating masses and by the spring preload of the masses, if such is provided.
  • the object of the invention is to provide a force limiting device of the type mentioned, in which the force-limited Gurtbandauszugsschi with structurally simple means as possible can be adapted to a desired force limiting characteristic.
  • the proposed solution makes it possible that the belt shaft rotates faster with the same oscillatory movement of the first oscillating part by the previously vehicle-fixed teeth, in which the first oscillating part alternately into and out of engagement, in turn is arranged on a second oscillating part, which additionally a relative movement to a vehicle-mounted gearing executes.
  • the second oscillating part practically forms a gear which translates the webbing pull-out speed into a higher webbing pull-out speed with a smaller restraining force for the occupant.
  • the force limiting device can be made smaller in reverse for a predetermined Gurtbandauszugs Bulgaria and a predetermined Kraftbegrenzungsclude.
  • the force limiting characteristic can also be changed by the design of the teeth of the second vibrating part, thus providing a further design parameter for the force limiting characteristic by which the force limiting characteristic can be improved with respect to a predetermined force limiting characteristic.
  • various kinematic motion sequences can be realized by the oscillating parts are alternately advanced or driven, for example, by alternately coupling to the power-limited motion exporting part.
  • the respective non-driven part can additionally be driven or indirectly driven by the driven part during the advancing movement.
  • different translations of Gurtbandauszugsterrorism and thus the force limiting levels can be realized.
  • a gear is practically realized by means of which the movements of the oscillating parts can be designed individually, independently of the webbing pull-out movement.
  • the teeth of the first oscillating member and the third toothing or the toothing of the second oscillating member into which the first oscillating member enters and disengages have different tooth spacings, so that the oscillatory behavior and the advancing movement of the two oscillating members designed to influence the force limiting characteristic deliberately different can be.
  • a stop be provided which limits the relative movement between the two oscillating parts and / or between one of the oscillating parts and a vehicle-fixed toothing and / or between one of the oscillating parts and a stationary tooth with respect to the force-limited movement part.
  • the toothing which is firmly connected to the force-limited movement exporting part, drives the first oscillating part and can thus also be referred to as driving toothing.
  • the Gurtbandauszugs Industries drops abruptly to a lower level and the force limiting level of the retention force increases abruptly to a higher level when the relative movement of the two parts is blocked by the stop to each other. If several attacks between different pairings of the relative Moving parts are provided moving parts, also a step-shaped course of Gurtbandauszugs Industries and the force limiting characteristic can be realized. If the power-limited movement exporting part is a belt shaft of a seat belt device, it would be in accordance with a gurtwellenfeste toothing in the driving gear.
  • the second oscillating part can preferably be fixed to the vehicle by means of a passively or actively releasable blocking device, so that the force limiting level can also be abruptly reduced by releasing the blocking device and the consequent release of the second oscillating part, and the webbing extension speed can suddenly be increased abruptly ,
  • the transmission according to the invention is thus activated or put into standby only by releasing the second oscillating part, while the force limiting device works with a blocked second oscillating part like a force limiting device described in the prior art.
  • the force limiting level can be lowered particularly quickly in a very short period of time by the blocking device can be solved by a pyrotechnically actuated switching device.
  • the second oscillating part can be decoupled from the first oscillating part, whereby the second oscillating part can be forcibly decoupled from the first oscillating part, or the second oscillating part can also be decoupled from the first oscillating part automatically by overcoming a spring force.
  • a structurally simple two-stage force limiting characteristic can be realized.
  • a positively controlled decoupling can be advantageous insofar as a decoupling of the two oscillating parts at a predetermined time or at a predetermined belt extension length can be realized automatically and reliably.
  • the decoupling can also be done automatically by overcoming a spring force.
  • the spring force in this case forms a further design parameter for realizing a predetermined force limiting characteristic.
  • the force limiting characteristic can be further varied by providing a releasable damping mass on the first and / or second oscillating part.
  • releasable damping mass By releasable damping mass, the vibration behavior of the first and / or the second vibrating part can be changed by the mass of the respective vibrating part is increased.
  • the vibration behavior in addition to the dimensioning of the mass of the damping mass can also be influenced by the time of release of the damping mass.
  • the damping mass and the first or second vibrating part preferably a variable game, so that the vibration behavior can also be changed within certain limits.
  • the variable clearance corresponds to a tighter o- and also looser coupling of the damping mass with the vibrating part and thus leads, depending on the degree of coupling directly to an increase or decrease of the vibrating part to be vibrated mass.
  • the game can thereby change automatically, whereby e.g. a declining linearly decreasing force limiting characteristic can be realized.
  • the game can also be actively reduced or increased, so that correspondingly linear progressive or degressive force limiting characteristics can be actively brought about.
  • FIG. 1 shows a belt shaft with a force limiting device according to the invention in an exploded view
  • FIG. 2 shows the belt shaft with the force limiting device of Figure 1 in the assembled state in a sectional view.
  • Fig. 7 is a force limiting device with a pyrotechnic switching device.
  • FIGS. 1 and 2 show a belt shaft 18 of a seat belt device for a motor vehicle with a force limiting device 1 according to the invention.
  • the belt shaft 18 is formed in two parts with a vehicle fixed blockable profile head 10 and a belt shaft body 28.
  • the profile head 10 and the belt shaft body 28 are interconnected via a force limiting device 1 according to the invention and a torsion bar 12, the profile head 10 is additionally carrier of a blocking device, not shown, in the form of a blocking pawl, which blocks the profile head 10 when driving vehicle-fixed.
  • a rotatably connected to the profile head 10 drive wheel 11 is provided, which is part of a pyrotechnic irreversible belt tensioning device.
  • the torsion bar 12 is rotatably connected at one end to the profile head 10 and rotatably connected to the other end with the force limiting device 1, which in turn is connected to the belt shaft body 28.
  • the torsion bar 12 and the force limiting device 1 are thus arranged in the power transmission path from the profile head 10 to the belt shaft body 28 in series. After the blocking of the profile head 10, a further rotation of the belt shaft body 28 is possible only under a plastic deformation of the torsion bar 12 and / or under an activation of the force limiting device 1.
  • the belt shaft body 28 has on the side remote from the profile head 10 side an externally toothed, annular shoulder 16 on which a housing part 22 of the force limiting device 1 via an axially directed ! Internal toothing 17 is held against rotation.
  • a rotatably connected to the free end of the torsion bar 12 bushing 15 is provided which is rotatably connected via an axially directed external toothing with a toothed disc 13.
  • a first vibrating part 2 and a second vibrating part 3 and a spring 14 are provided between the gear disc 13 and the housing part 22, a first vibrating part 2 and a second vibrating part 3 and a spring 14 are provided.
  • the spring 14 serves the spring preload of the second oscillating part 3 and thereby defines a starting torque to be overcome for activating the force limiting device 1. However, it is also conceivable to omit the spring 14, the force limiting device 1 would then be activated at a lower starting torque.
  • the housing part 22 and the toothed disc 13 each have on their axially mutually facing side surfaces annular toothings 7 and 9 with extending in the radial direction tooth flanks.
  • the two oscillating parts 2 and 3 are annular and also have annular toothings 4, 5, 6, 30 on their two side surfaces.
  • the first oscillating part 2 has an inner toothing 29 at its inner diameter and the outer vibrating part 3 has an outer toothing 8 at its outer diameter.
  • the two oscillating parts 2 and 3 are dimensioned such that the second oscillating part 3 is arranged in the opening of the first oscillating part 2 and engages with the external toothing 8 in the internal toothing 29 of the first oscillating part 2. Furthermore, the first oscillating part 2 has a radially projecting projection 19 and the housing part 22 has an axially protruding stop 31.
  • the force limiting device 1 is activated by the toothed disc 13 is blocked in a Gurtbandauszugsrich- direction by blocking the profile head 10 in a first step. If the webbing pull-out force subsequently increases, the belt shaft body 28 exerts an increasing torque via the housing part 22 onto the force-limiting device 1.
  • the first oscillating member 2 By the force exerted by the housing part 22 torque the first oscillating member 2 is driven in a known manner to a swinging motion during which it alternately into and out of engagement with the teeth 7 of the housing part 22 and the teeth 9 of the locked gear disc 13 and at the same time in the circumferential direction rotates.
  • the second oscillating part 3 engages with the external toothing 8 in the internal teeth. tion 29 of the first vibrating part 2 and is thereby driven by the first vibrating part 2 in the circumferential direction.
  • the second oscillating part 3 alternately engages with the toothings 4 and 30 in the toothings 7 and 9 of the housing part 22 and thereby executes an oscillating rotational movement.
  • the Oscillating part 3 thereby mutually drive each other and together form a gear which allows a higher speed of the belt shaft body 28 and a higher Gurtband- abstract speed than the peripheral speed or the rotational speed of the vibrating parts 2 and 3.
  • the advantage of the proposed solution lies in particular in that the first oscillating part 2 engages in a toothing (the external toothing 8) which is also part of a moving part (of the second vibrating part 3).
  • the movement of the first oscillating part 2 is translated into a faster movement of the belt shaft body 28.
  • the movement conditions of the transmission can be changed by the design of the two oscillating parts 2 and 3 and in particular by the interpretations of the teeth 7, 5, 6, 4, 30, 8, 29 and 9 in their tooth spacings.
  • the radially outwardly projecting projection 19 and on the housing part 22 of the axially projecting stop 31 are provided, which are arranged so that the first oscillating part 2 with the projection 19 after a predetermined rotation angle of a maximum of 360 degrees on the Stop 31 comes to the plant and blocks the further movement of the first oscillating part 2.
  • a stop of the force-limited belt extension movement can be realized. Since the belt shaft body 28 due to the transmission performs a greater rotational speed than the first oscillating part 2, the angle of rotation of the first oscillating part 2 is indeed limited to 360 degrees, but the belt shaft body 28 can quite a larger number of revolutions. e.g. two turns at a gear ratio of 2: 1.
  • FIG. 5 shows a further development of the invention, in which a releasable damping mass 21 is additionally provided on the second oscillating part 3.
  • the damping mass can be arranged with a variable clearance on the second vibrating part 3, whereby a variable oscillation behavior of the second oscillating part 3 and thus a changing movement behavior of the transmission and thus of the force-limited belt extension movement or of the force limitation level is possible.
  • the play of the damping mass 21 can initially be set or specifically designed, or be actively changed by a device.
  • the oscillating mass of the second oscillating part 3 can also be lowered very simply and abruptly, by releasing the damping mass 21 from the second oscillating part 3.
  • FIG. 6 shows a further development of the invention in which a third oscillating part 23 is provided in addition to the two oscillating parts 2 and 3, which likewise has two lateral toothings and engages with radially outer teeth in an internal toothing of the second oscillating part 3.
  • the third oscillating part 23 has a switching ramp 24 which, after a predetermined angle of rotation, comes into abutment against a form-corresponding switching ramp 25 of the toothed disc 13 and then axially displaces the third oscillating part 23 during the further movement.
  • the force limiting device 1 is thereby forcibly switched by the third oscillating member 23 is actively brought out of engagement with the internal toothing of the second oscillating member 3.
  • the circuit can also be done automatically by overcoming a spring force by the third vibrating member 23 is loaded with a spring whose force must be overcome to the circuit of the transmission.
  • FIG. 7 shows a further development of the invention, in which the transmission can be switched by a pyrotechnic switching device.
  • the pyrotechnic switching device 26 drives a ratchet wheel 27 of the transmission and thereby sets at least one of the oscillating parts 2, 3 or 23, or at least one of the oscillating parts 2, 3 or 23 releases it.
  • a stepped Gurtbandauszugsschi or force limiting characteristic can be realized.

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

Abstract

La présente invention concerne un limiteur d'effort (1) pour véhicule automobile, comportant un premier élément oscillant (2) auquel peut être imprimé un mouvement d'oscillation et qui est ou peut être raccordé à un élément (18) du véhicule automobile effectuant un mouvement de limitation d'effort. Le premier élément oscillant (2) est muni d'une première et d'une deuxième denture (5, 6) par lesquelles le premier élément oscillant (2) est mis alternativement en prise et hors prise avec une ou deux dentures (7, 8) pendant le mouvement d'oscillation lors de l'activation du limiteur d'effort (1), et effectue ainsi un mouvement d'avance oscillant dans la direction périphérique. Au moins une des dentures (7, 8) avec lesquelles le premier élément oscillant (2) est mis alternativement en prise ou hors prise est agencée sur un second élément oscillant (3) qui est mis alternativement en prise et hors prise par une troisième denture (4) avec une quatrième denture (9) solidaire du véhicule, la mise en prise du premier élément oscillant (2) avec la denture (7, 8) imprimant au moins temporairement un mouvement relatif du second élément oscillant (3) par rapport à la quatrième denture (9) solidaire du véhicule.
PCT/EP2018/075162 2017-09-19 2018-09-18 Limiteur d'effort pour véhicule automobile WO2019057693A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017216534.0A DE102017216534B4 (de) 2017-09-19 2017-09-19 Kraftbegrenzungseinrichtung für ein Kraftfahrzeug
DE102017216534.0 2017-09-19

Publications (1)

Publication Number Publication Date
WO2019057693A1 true WO2019057693A1 (fr) 2019-03-28

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ID=63685950

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Application Number Title Priority Date Filing Date
PCT/EP2018/075162 WO2019057693A1 (fr) 2017-09-19 2018-09-18 Limiteur d'effort pour véhicule automobile

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DE (1) DE102017216534B4 (fr)
WO (1) WO2019057693A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006108451A1 (fr) 2005-04-12 2006-10-19 Autoliv Development Ab Limiteur de force destine a un vehicule
DE102008049931A1 (de) 2008-10-02 2010-05-20 Autoliv Development Ab Kraftbegrenzungseinrichtung für ein Kraftfahrzeug
DE102011101515A1 (de) * 2011-05-13 2012-11-15 Autoliv Development Ab Kraftbegrenzungseinrichtung für ein Kraftfahrzeug und Gurtaufroller
DE102010050189B4 (de) 2010-11-04 2014-03-06 Autoliv Development Ab Kraftbegrenzungseinrichtung für ein Kraftfahrzeug
EP3156290A1 (fr) * 2014-06-10 2017-04-19 Takata Corporation Prétensionneur de ceinture de sécurité, et dispositif de ceinture de sécurité

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6266389B2 (ja) * 2014-03-12 2018-01-24 タカタ株式会社 エネルギー吸収装置、シートベルトリトラクタ及びシートベルト装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006108451A1 (fr) 2005-04-12 2006-10-19 Autoliv Development Ab Limiteur de force destine a un vehicule
DE102008049931A1 (de) 2008-10-02 2010-05-20 Autoliv Development Ab Kraftbegrenzungseinrichtung für ein Kraftfahrzeug
DE102010050189B4 (de) 2010-11-04 2014-03-06 Autoliv Development Ab Kraftbegrenzungseinrichtung für ein Kraftfahrzeug
DE102011101515A1 (de) * 2011-05-13 2012-11-15 Autoliv Development Ab Kraftbegrenzungseinrichtung für ein Kraftfahrzeug und Gurtaufroller
EP3156290A1 (fr) * 2014-06-10 2017-04-19 Takata Corporation Prétensionneur de ceinture de sécurité, et dispositif de ceinture de sécurité

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DE102017216534A1 (de) 2019-03-21
DE102017216534B4 (de) 2022-01-20

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