WO2015197172A1 - Enrouleur de ceinture équipé d'un dispositif de limitation de force - Google Patents

Enrouleur de ceinture équipé d'un dispositif de limitation de force Download PDF

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Publication number
WO2015197172A1
WO2015197172A1 PCT/EP2015/001222 EP2015001222W WO2015197172A1 WO 2015197172 A1 WO2015197172 A1 WO 2015197172A1 EP 2015001222 W EP2015001222 W EP 2015001222W WO 2015197172 A1 WO2015197172 A1 WO 2015197172A1
Authority
WO
WIPO (PCT)
Prior art keywords
belt
belt retractor
triggering
force
retractor according
Prior art date
Application number
PCT/EP2015/001222
Other languages
German (de)
English (en)
Inventor
Michael Stegmeier
Original Assignee
Trw Automotive Gmbh
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 Trw Automotive Gmbh filed Critical Trw Automotive Gmbh
Publication of WO2015197172A1 publication Critical patent/WO2015197172A1/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
    • B60R22/36—Belt retractors, e.g. reels self-locking in an emergency
    • B60R22/38—Belt retractors, e.g. reels self-locking in an emergency responsive only to belt movement

Definitions

  • the invention relates to a belt retractor with a force limiting device.
  • a belt retractor with a belt reel rotatably mounted in a frame, a frame rotatably lockable disk and a first, permanent and a second, switchable force limiting device is known.
  • the first permanent force limiting device comprises a torsion bar arranged in the hollow interior of the belt reel, which is non-rotatably coupled to the disk at one axial end and non-rotatably connected to the belt reel at the opposite end.
  • the second, switchable force limiting device comprises a cutting body, which is einberichtbar in a coupling position in which the cutting body couples the belt reel to the disc, that the cutting body machined material during a relative rotation between the disc and belt reel.
  • a Einberichtmechanismus ensures that the second, switchable force limiting device, here in the form of the cutting body, depending on accident-related data in the triggering position einclairt.
  • body data of the vehicle occupant, seat position data or data that is representative of the severity of the accident are considered as accident-related data.
  • This data can be z. B. by sensors or otherwise, such. B. by determining the length of the withdrawn webbing or the spin or speed of the belt reel before blocking can be determined.
  • the object of the invention is to provide a belt retractor with improved individual adjustment of the force limiting level in a case of restraint.
  • the belt retractor according to the invention for a motor vehicle comprises a belt spool and a switchable force limiting device with a Ein horrmechanismus that can trigger a force limit in the course of a case of restraint.
  • the Ein horrmechanismus at least one movable coupled to the belt reel triggering element, which is deflected in the case of restraint during rotation of the belt reel depending on the centrifugal force acting on the trigger element and independent of an angular acceleration of the belt reel in a triggering position to trigger the force limit.
  • the switchable force limiting device can be the sole
  • Be force limiting device or be provided in addition to a permanent force limiting device.
  • the triggering element need not be stored directly in the belt reel, but may also be included in a coupled to the belt reel component, as long as this rotates with the belt reel.
  • the entire force limiting device of the belt retractor in the case of restraint basically provides a first, constant level of force limitation (ground level), which is tuned to relatively light or small occupants (so-called 5% - and possibly 50% -Lnsassen) .
  • the switchable force limit which is triggered by the special Ein Kunststoffmechanismus, however, comes only in relatively heavy or large occupant used (so-called 95% - and possibly 50% -arteries), so that an additional level of force limitation is provided for these occupants added to the ground level.
  • the force limiting device of the belt retractor according to the invention should accordingly be set up to provide a force limitation independent of the control mechanism at a base level in a restraint case.
  • This independent force limitation can be achieved in particular by means of a torsion bar.
  • the triggering element in the release position cause two effects: either a final blockage of the rotation of the belt reel is effected, ie the rotation of the belt reel is completely prevented, which corresponds to an infinitely high level of force limiting, or the trigger element leaves in the release position, a further rotation of the Belt reel to, but only with the involvement of the switchable force limiting device, for example, under cutting material, by deformation of strip material or other known force limiting mechanisms.
  • the at least one triggering element can be designed as a centrifugal force pawl which activates in the tripping position into a frame-fixed toothing. This design is particularly recommended in the case of a complete blockage of the belt reel. "Frame-fixed” in this context means that the toothing is formed either in the context of the belt retractor itself or in a fixedly connected to the frame component.
  • the trigger element is preferably deflected against the restoring force of a restoring spring in the release position. This can be ensured in a simple manner that the triggering element is deflected into the triggering position only at a centrifugal force that exceeds the restoring force of the return spring.
  • the return spring is a tension spring which exerts a directed to the axis of rotation of the belt reel return force on the trigger element.
  • a tension spring is in particular a helical tension spring into consideration.
  • a detent mechanism is provided for retaining the trigger element, which biases the trigger element into an initial position. Only when the centrifugal force overcomes the preload, the trigger element is deflected.
  • the latching mechanism may comprise a return spring in the form of a compression spring which presses a latching element into a latching recess of the triggering element, preferably in the linear direction.
  • compression spring is then in particular a helical compression spring into consideration.
  • the locking element As a latching element of the latching mechanism, which is pressed into the latching recess of the triggering element, offers a ball or a roller.
  • the locking element may also be part of the spring itself. In this case, the locking element is therefore not a separate component.
  • the compression spring is supported on a base which is adjustable by an adjusting mechanism.
  • FIG. 1 shows a first embodiment of a belt retractor according to the invention with force limiting device in longitudinal section;
  • - Figure 2 is an end sectional view of the belt retractor of Figure 1;
  • - Figure 3 is an end sectional view of a belt retractor according to the invention according to a second embodiment;
  • FIG. 4 is an end sectional view of a belt retractor according to the invention according to a third embodiment.
  • the belt retractor shown schematically in Figure 1 comprises a belt 10 rotatably mounted in a frame belt 12.
  • a locking system for blocking the rotation of the belt reel 12 is provided at a first end face of the belt reel 12.
  • the locking system comprises a toothed disk 14, which is non-rotatably coupled by means of a connecting ring 16 to a first flange 18 of the belt reel 12.
  • the toothed disc 14 is z. B. by shear pins to a certain torque rotatably connected to the flange 18 of the belt reel 12.
  • a torsion bar 22 is arranged, which is non-rotatably coupled at a first axial end to the toothed disc 14 and at the opposite end to the belt reel 12.
  • the torsion bar 22 is part of a first, permanent force limiting device and serves in a case of restraint to provide a first force limiting level, as will be explained in more detail later.
  • a Einberichtmechanismus is provided, which is also part of the entire force limiting device of the belt retractor and is used for optional, switchable provision of a second Kraftbegrenzungscludes.
  • the Ein horrifugal pawls 24 are formed by two triggering elements in the form of two opposing centrifugal pawls 24.
  • the centrifugal pawls 24 are mounted by means of return springs 26 in a second flange 28 of the belt reel 12 so that they can be deflected against the return force of the return springs 26 in the radial direction.
  • the return springs 16 are here tension springs which exert a restoring force directed toward the axis of rotation on the centrifugal force pawls 24.
  • centrifugal pawls 24 cooperate with a toothing 30 formed either in the frame 10 or in a frame-fixed component. More accurate said centrifugal force pawls 24 can be deflected from an initial position to a release position in which the centrifugal pawls 24 in the toothing 30 einêtn.
  • the locking system is activated, i. H. the toothed wheel 14 is locked by the control of the pawl 20 on the frame 10 of the belt retractor rotatably.
  • the belt reel 12 is rotatably coupled via the torsion bar 22 with the frame 10, so that a further rotation of the belt reel 12 is prevented in Gurtbandabzugsraum.
  • the torsion bar 22 twists and allows a gurtkraftbeskybesky rotation of the belt reel 12 relative to the toothed disc 14.
  • the twisting of the torsion bar 22 corresponds to a first level of force limitation.
  • an additional force limitation can take place, which was possibly triggered by the input mechanism. Whether or not a second level of force limitation is provided depends on the centrifugal force acting on the tripping elements, in this case the centrifugal pawls 24.
  • a rotation of the belt reel 12 is caused, which is caused by the advancement of the occupant in an abrupt deceleration of the vehicle, the rotational speed depends in particular on the weight of the occupant and the severity of the accident.
  • the weight and the bearing of the trigger elements are designed so that they are deflected into the trigger positions when the rotational speed of the belt reel 12 exceeds a predetermined value. It should be noted that the deflection into the triggering positions is independent of the angular acceleration of the belt reel 12 or of the triggering elements.
  • the centrifugal force pawls 24 engage in the toothing 30, so that the rotation of the belt reel 12 is finally prevented.
  • the rotation of the belt reel 12 is not completely prevented, but the centrifugal pawls 24 itself or to the centrifugal pawls 24 coupled cutting body in a further rotation of the belt reel 12 relative to the toothed disc 14 material chipping, for example, material of the frame 10 or another frame-fixed component.
  • the second force limit level can thus either infinitely high (final blocking of the belt reel 12) or by certain parameters such as cutting width, depth of cut, hardness or deformability of the material to be machined or deformed, etc. be specified.
  • Figure 3 a second embodiment of the Ein tenumechanismus is shown.
  • centrifugal pawls 24 are provided, which can be deflected at a correspondingly fast rotation of the belt reel 12 due to the centrifugal force from its initial position in the radial direction in a release position, to then provide a second level of force limitation.
  • the centrifugal force claws 24 are in turn initially held in their initial position by return springs 26 and are deflected radially only upon overcoming a return force.
  • the return springs 26 are here but no tension springs, but compression springs.
  • the return springs 26 are supported at one end on a base 32, while the other end presses a locking element, here a ball 34, against the associated centrifugal force pawl 24. More precisely, the return spring 26 presses the ball 34 in a direction substantially perpendicular to the radial deflection of the centrifugal force pawl 24 in a recess 36 of the centrifugal pawl 24.
  • the centrifugal pawl 24 thanks to the special design of the recess the ball 34 against the restoring force ( Bias) of the return spring 26 so far in the direction of the base 32 press that the centrifugal force pawl 24 can move in the radial direction to trigger the second belt force limit.
  • the base 32 can be adjusted by an adjusting mechanism in the form of an adjusting screw 38 in the longitudinal direction of the return spring 26 to adjust the restoring force of the return spring 26 and adjust.
  • the base 32 itself may be part of the adjusting screw 38 or be formed by a separate, adjustable by means of the adjusting screw 38 component. Otherwise, the operation of the Einberichtmechanismus corresponds to that of the first embodiment.
  • the third embodiment of the insertion mechanism shown in Figure 4 largely corresponds to the second embodiment with the difference that the return spring 26 is here a leaf spring.
  • a first end of the leaf spring is firmly anchored in the belt reel 12, while the second end presses into the catch recess 36 of the centrifugal force pawl 24 so that it is initially held in its initial position. Only when a predetermined speed of the belt reel 12 is exceeded, the centrifugal force acting on the centrifugal force pawl 24 overcomes the restoring force (bias) of the leaf spring; the second end of the leaf spring is pushed away, and the centrifugal force pawl 24 moves in the radial direction in the release position.
  • the number of trigger elements may vary depending on the design of the Einberichtmechanismus. In principle, a triggering element is sufficient, but for symmetry and / or safety reasons, two or more triggering elements are usually provided. It is of course possible to vary certain parameters such as the restoring force of the return springs 26 within one embodiment and / or to combine features of the various embodiments in a suitable manner.
  • the return forces can be designed so that at a first rotational speed of the belt reel 12 only a first number of trigger elements (at least one) and at a higher second rotational speed a larger number are deflected into the triggering position.
  • the triggering elements can be selectively moved back out of the triggering position.
  • the triggering elements need not necessarily be mounted in a flange of the belt reel 12. You can also be stored in a separate, coupled to the belt reel 12 component.
  • the force limiting device with the special control mechanism is suitable both for standard belt retractors and for belt retractors with tensioning function (retractor tensioner).

Landscapes

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

Abstract

L'invention concerne un enrouleur de ceinture destiné à un véhicule automobile comprenant une bobine de ceinture (12) et un dispositif de limitation de force commutable équipé d'un mécanisme de commande qui peut déclencher une limitation de force au cours d'un cas de retenue. Le mécanisme de commande comprend au moins un élément de déclenchement (24) qui est accouplé de façon mobile à la bobine de ceinture (12) et qui est dévié dans une position de déclenchement, pour déclencher la limitation de force, en cas de retenue, lors de la rotation de la bobine de ceinture (12) en fonction la force centrifuge agissant sur l'élément de déclenchement (24) et indépendamment de l'accélération angulaire de la bobine de ceinture (12).
PCT/EP2015/001222 2014-06-25 2015-06-17 Enrouleur de ceinture équipé d'un dispositif de limitation de force WO2015197172A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014009267.4 2014-06-25
DE102014009267.4A DE102014009267A1 (de) 2014-06-25 2014-06-25 Gurtaufroller mit Kraftbegrenzungseinrichtung

Publications (1)

Publication Number Publication Date
WO2015197172A1 true WO2015197172A1 (fr) 2015-12-30

Family

ID=53496621

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/001222 WO2015197172A1 (fr) 2014-06-25 2015-06-17 Enrouleur de ceinture équipé d'un dispositif de limitation de force

Country Status (2)

Country Link
DE (1) DE102014009267A1 (fr)
WO (1) WO2015197172A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017118694A1 (de) * 2017-08-16 2019-02-21 Trw Automotive Gmbh Gurtaufroller
DE102020207535A1 (de) 2020-06-18 2021-12-23 Autoliv Development Ab Gurtaufroller

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1555614A1 (de) * 1965-11-15 1970-11-05 G E Y Patenter Automatische Gurteinziehvorrichtung fuer Sicherheitsgurte in Kraftwagen
DE102005028174A1 (de) 2004-06-23 2006-01-12 Trw Automotive Gmbh Gurtaufroller mit Kraftbegrenzungseinrichtung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1555614A1 (de) * 1965-11-15 1970-11-05 G E Y Patenter Automatische Gurteinziehvorrichtung fuer Sicherheitsgurte in Kraftwagen
DE102005028174A1 (de) 2004-06-23 2006-01-12 Trw Automotive Gmbh Gurtaufroller mit Kraftbegrenzungseinrichtung

Also Published As

Publication number Publication date
DE102014009267A1 (de) 2015-12-31

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