WO2019072540A1 - Rétracteur de ceinture - Google Patents

Rétracteur de ceinture Download PDF

Info

Publication number
WO2019072540A1
WO2019072540A1 PCT/EP2018/075898 EP2018075898W WO2019072540A1 WO 2019072540 A1 WO2019072540 A1 WO 2019072540A1 EP 2018075898 W EP2018075898 W EP 2018075898W WO 2019072540 A1 WO2019072540 A1 WO 2019072540A1
Authority
WO
WIPO (PCT)
Prior art keywords
belt
belt retractor
spring
gurtspulenflansch
clutch disc
Prior art date
Application number
PCT/EP2018/075898
Other languages
German (de)
English (en)
Inventor
Kai-Ulrich Machens
Milos Cekic
Michal Kaskosz
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 WO2019072540A1 publication Critical patent/WO2019072540A1/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

Definitions

  • the invention relates to a belt retractor of a vehicle safety belt system.
  • belt webbing can be removed from its belt spool with only slight resistance.
  • the belt withdrawal is blocked in the blocked state of the belt retractor to prevent further Gurtbandausgabe.
  • the blocked state can be initiated in two ways, on the one hand vehicle-sensitive, if the forces acting on the vehicle acceleration forces exceed a certain threshold or belt-sensitive when the force acting on the webbing in Gurtabzugsplatz force exceeds a predetermined threshold.
  • the clutch disc For the vehicle-sensitive initiation of blocking the clutch disc is provided with a toothing, in which a blocking element of a vehicle-mounted acceleration sensor can engage to retain the clutch disc behind the rotation of the belt reel.
  • a blocking element of a vehicle-mounted acceleration sensor can engage to retain the clutch disc behind the rotation of the belt reel.
  • an inertia element is provided on the clutch disc, which retains the clutch disc due to the inertia behind the rotation of the belt reel.
  • the pawl rotates together with the belt reel.
  • the clutch disc is usually located between a belt spool flange supporting the pawl and a lid closing the belt retractor outwardly.
  • the object of the invention is to provide a belt retractor, which are reduced in a simple manner in normal operation rattling noises.
  • This object is achieved by a belt retractor having the features of claim 1.
  • a belt retractor of a vehicle seat belt system which has a frame, a locking toothing arranged on the frame and a belt reel mounted in the frame, wherein the belt reel has a locking pawl engageable in the locking toothing and having a belt spool flange and an axial direction at an axial end the belt reel is provided adjacent to the Gurtspulenflansch arranged clutch disc which is rotatable relative to Gurtspulenflansch by a predetermined amount, at least one spring element is provided which applies an axially acting force by which the clutch disc between the Gurtspulenflansch and a housing part of the belt retractor is biased in the axial direction , In this way, a play-free mounting of the clutch disc in the axial direction can be achieved without significant additional effort in the production, which contribute
  • the housing part is in particular a cover of the belt retractor, normally a so-called sensor cover, under which normally a vehicle-sensitive locking mechanism is also arranged.
  • the cover In the axial direction, the cover is normally the component closest to the clutch disc, so that the direct contact makes it possible to adjust the pretensioning effect.
  • a plurality of spring elements in particular three spring elements, are provided.
  • the spring elements are preferably arranged offset along the circumferential direction, which allows a distribution of the spring action over the circumference. It is possible that at least two of the spring elements have different spring stresses. By this measure, the asymmetric mass distribution of the clutch disc over the circumference can be compensated for and align the clutch disc parallel to Gurtspulenflansch. This reduces frictional forces between the clutch disc and the belt spool flange and achieves uniform preload of the clutch disc.
  • the spring tension is applied differently even in the unloaded state of the respective spring elements by the spring elements are given different spring constants.
  • the at least one spring element is preferably arranged on the clutch disc and may be integrally formed therewith in order not to increase the number of components of the belt retractor. This is advantageous for all provided spring elements.
  • the clutch disc has a ring extension located radially within the at least one spring element, and in particular within all spring elements, through which an axle extension connected to the belt spool flange extends, wherein a free axial end of the ring extension bears under pretension on the housing part ,
  • the bias voltage is generated in this case in the immediate vicinity of the rotational axis of the clutch disc, which minimizes frictional forces.
  • the at least one spring element is formed for example by an axially deflectable spring arm.
  • a spring arm Preferably, three spring arms are provided, which are distributed uniformly over the circumference. These three spring arms can form all existing spring elements and provide the entire axial preload between the clutch disc and the housing part.
  • the at least one spring element and in particular all the spring elements are formed integrally with the clutch disk, for example in an injection molding process.
  • the at least one spring element advantageously has a contact portion which slides on the Gurtspulenflansch.
  • the contact section is advantageously formed by a free end of the spring arm, wherein all available Fe- deretti can have such a contact portion at its free end.
  • the at least one spring element in particular the contact portions of all the spring elements are advantageously radially inwardly of the pawl and are arranged as close to the axis of rotation of the clutch disc to minimize the influence of the friction of the spring elements on the torque of the clutch disc.
  • the pawl is arranged on the belt spool flange, for example in a pocket on the belt spool flange, and the clutch disk and belt spool flange are coupled via a restoring spring which exerts a force on the clutch disk in the direction of its starting position in which the pawl engages an uncontrolled basic position is.
  • the axial forces acting on the clutch disc via this coupling which may vary over the circumference of the clutch disc, can also be compensated for by a suitable choice of the spring constants of the spring elements.
  • FIG. 1 shows a schematic exploded view of a belt retractor according to the invention
  • Figure 2 is a schematic perspective view of a clutch disc, mounted on a Gurtspulenflansch the belt retractor according to the invention;
  • Figure 3 is a schematic perspective sectional view of the assembly of Figure 2;
  • Figure 4 is a schematic sectional view of the locking side of the belt retractor according to the invention.
  • Figure 5 is a schematic plan view of the locking side of the inventive belt retractor without the cover of the belt retractor.
  • the figures show a belt retractor 10 of a vehicle seat belt system, not shown.
  • FIG. 1 shows the general structure of the belt retractor 10.
  • a belt spool 12 with webbing 14 wound thereon is mounted in a frame 16 which has a lateral opening with a locking toothing 18 formed on its inner edge.
  • a Gurtspulenflansch 20 is rotatably connected to the belt reel 12.
  • a pawl 22 is arranged, in this example received in a pocket of Gurtspulenflansches 20 which can engage in the locking teeth 18 on the frame 16 of the belt retractor 10 to lock the belt reel 12.
  • the pawl 22 is located in the pocket on Gurtspulenflansch 20 that it is not in contact with the ratchet teeth 18.
  • a clutch disc 24 is arranged, which rotates in the normal operation of the belt retractor 10 together with the Gurtspulenflansch 20 and the belt reel 12, but rotatably supported by a return spring 26 by a predetermined amount relative to the Gurtspulenflansch 20 is.
  • a cover 28 also referred to as a sensor cover, which closes the belt retractor 10 on the locking side to the outside.
  • the belt reel 12 is mounted on the locking side 20 via an axle extension 30 on Gurtspulenflansch.
  • the clutch disc 24 is biased in the axial direction A relative to a housing part of the belt retractor 10, here opposite the cover 28, and the Gurtspulenflansch 20 by at least one spring element 32.
  • a total of three spring elements 32 are provided, which are each formed by a spring arm extending in the circumferential direction U.
  • the three spring elements 32 are distributed in the circumferential direction U uniformly over the circumference of the clutch disk 24.
  • All three spring elements 32 are integrally formed in this example together with the clutch disc 24, for example by injection molding.
  • Each of the spring elements 32 integrally engages the clutch disc 24 at one of its ends and projects at its free end in the direction of the belt spool flange 20.
  • the free ends form contact sections 34 which rest on the surface of the belt spool flange 20 with only small contact surfaces and slide thereon when the clutch disc 24 is rotated relative to the Gurtspulenflansch 20.
  • the support of the clutch disc 24 on the Gurtspulenflansch 20 takes place here essentially by the contact portions 34 of the spring elements 32nd
  • the clutch disc 24 has an annular extension 36 which surrounds the axle extension 30 of the Gurtspulenflansches 20 circumferentially.
  • the bias applied by the spring elements 32 presses the free axial end 38 of the annular extension 36 against the inside of the cover 28.
  • the annular extension 36 is located in the radial direction r immediately adjacent to the axle extension 30.
  • the spring elements 32 are arranged in the radial direction r as close as possible to the annular extension 36, to minimize the frictional forces between the clutch plate 24 and the belt spool flange 20.
  • all the spring elements 32 lie radially inwardly of the pawl 22 in a plan view of the locking side of the belt retractor 10 (see, e.g., Fig. 5).
  • a single-cost guide is provided, which is formed here in a known manner by a guide pin 40 which engages in a slotted guide 42.
  • the guide pin 40 is arranged in the axial direction A projecting on the pawl 22, while the slide guide 42 formed in the clutch disc 24 is.
  • the return spring 26 is designed here as a bow spring and engages on the one hand on the clutch disc 24 and the other on Gurtspulenflansch 20.
  • the pawl 22 is pivoted into its stowed position in which it engages in the locking teeth 18. This can be done either via the vehicle-sensitive locking mechanism or via the belt-sensitive locking mechanism, both of which are designed as known and are not shown here.
  • the clutch disk 24 is returned to its starting position by the return spring 26, whereby the pawl 22 is also moved back into its basic position via the guiding-in guide.

Landscapes

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

Abstract

Rétracteur de ceinture d'un système de ceinture de sécurité de véhicule, présentant un cadre (16), une denture de blocage (18) disposée sur le cadre (16) et une bobine de ceinture (12) montée dans le cadre (16), la bobine de ceinture (12) présentant un cliquet (22) pouvant être commandé de manière à pénétrer dans la denture de blocage (18) et un flasque de bobine de ceinture (20) à une extrémité axiale, ainsi qu'un disque d'accouplement (24) qui est disposé dans le sens axial (A) de la bobine de ceinture (12) à côté du flasque de bobine de ceinture (20) et qui peut tourner d'une valeur prédéterminée par rapport au flasque de bobine de ceinture (20). Ce rétracteur de ceinture présente au moins un élément ressort (32) qui exerce une force axiale permettant de précontraindre le disque d'accouplement (24) entre le flasque de bobine de ceinture (20) et une partie boîtier du rétracteur de ceinture (10) dans le sens axial (A).
PCT/EP2018/075898 2017-10-13 2018-09-25 Rétracteur de ceinture WO2019072540A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017123841.7 2017-10-13
DE102017123841.7A DE102017123841A1 (de) 2017-10-13 2017-10-13 Gurtaufroller

Publications (1)

Publication Number Publication Date
WO2019072540A1 true WO2019072540A1 (fr) 2019-04-18

Family

ID=63787899

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/075898 WO2019072540A1 (fr) 2017-10-13 2018-09-25 Rétracteur de ceinture

Country Status (2)

Country Link
DE (1) DE102017123841A1 (fr)
WO (1) WO2019072540A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004038390A1 (de) * 2003-09-03 2005-03-31 Trw Automotive Gmbh Gurtaufroller für einen Fahrzeug-Sicherheitsgurt

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2722744A1 (de) * 1977-05-20 1978-11-23 Eckhard Dr Ing Hildebrandt Aufrollvorrichtung fuer sicherheitsgurte von kraftfahrzeugen
DE20109534U1 (de) * 2001-06-07 2001-10-18 TRW Occupant Restraint Systems GmbH & Co. KG, 73553 Alfdorf Gurtaufroller

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004038390A1 (de) * 2003-09-03 2005-03-31 Trw Automotive Gmbh Gurtaufroller für einen Fahrzeug-Sicherheitsgurt

Also Published As

Publication number Publication date
DE102017123841A1 (de) 2019-04-18

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