WO2018158361A1 - Enrouleur de ceinture comprenant un capteur d'accélération amortissant les bruits - Google Patents

Enrouleur de ceinture comprenant un capteur d'accélération amortissant les bruits Download PDF

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Publication number
WO2018158361A1
WO2018158361A1 PCT/EP2018/055034 EP2018055034W WO2018158361A1 WO 2018158361 A1 WO2018158361 A1 WO 2018158361A1 EP 2018055034 W EP2018055034 W EP 2018055034W WO 2018158361 A1 WO2018158361 A1 WO 2018158361A1
Authority
WO
WIPO (PCT)
Prior art keywords
belt retractor
core part
frame part
acceleration sensor
core
Prior art date
Application number
PCT/EP2018/055034
Other languages
German (de)
English (en)
Inventor
Arne Bargmann
Doris Kröger
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 WO2018158361A1 publication Critical patent/WO2018158361A1/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
    • B60R22/36—Belt retractors, e.g. reels self-locking in an emergency
    • B60R22/40—Belt retractors, e.g. reels self-locking in an emergency responsive only to vehicle movement

Definitions

  • the invention relates to a belt retractor with a noise-damped acceleration sensor having the features of the preamble of claim 1.
  • the acceleration sensor arranged in the belt retractor.
  • the acceleration sensor is composed of a plurality of mutually movable parts which generate the unwanted noise during Gurtbandaus- and -zugzugsschien and vibrations of the motor vehicle. These are, for example, an inertial mass present in the acceleration sensor, which is movably mounted in a frame, and a blocking lever, which is deflected when the predetermined vehicle deceleration is exceeded by the movement of the inertial mass.
  • the blocking lever then activates the blocking system of the belt retractor by engagement with a toothing of a toothed ring or a toothed disk, with the result that the belt retractor is then blocked in the belt webbing withdrawal direction.
  • the blocking lever and the toothed disc must be aligned very precisely in relation to one another, so that the blocking lever functions reliably in the toothing of the toothed ring during a deflection. controls.
  • a belt retractor with a noise-damped acceleration sensor is already known from US Pat. No. 6,082,655, in which a noise-absorbing layer of a polymer is provided between the acceleration sensor and a housing cap covering the acceleration sensor to the outside.
  • This type of noise attenuation is insufficient in that the attenuation of the noise is dependent on the arrangement and the thickness of the sound absorbing layer.
  • the thickness and the arrangement can not be chosen arbitrarily due to the available space, so that it is unavoidable in this type of noise attenuation that a residual noise remains.
  • the noise attenuation due to the arrangement of the layer is very direction-dependent.
  • the inertial mass 3 of the acceleration sensor 2 is designed here as a standing mushroom-shaped mass of die-cast zinc and coupled with a blocking lever 4.
  • the contact surface defining the tilting behavior of the inertial mass 3 is arranged in a support element 6, via which the acceleration sensor 2 is held directly in a receptacle 11 of a blocking mass 5.
  • the blocking compound 5 is clipped into the housing cap 10 and thereby at the same time forms the attachment of the acceleration sensor 2 relative to the housing cap 10. Except the connection via the blocking mass 5 is between the acceleration sensor 2 and the housing cap 10 and thus also to the belt retractor 1 total no physical connection , A propagation of structure-borne sound waves bypassing the barrier mass 5 is not possible.
  • the noise generated by the blocking lever 4 and the inertial mass 3 are attenuated by the phase shift in the transition from the support element 6 on the barrier mass 5 and the blocking mass 5 on the housing cap 10.
  • the invention has the object to provide a belt retractor with a noise-damped acceleration sensor, the noise attenuation should be further improved, designed to be effective and particularly directionally independent, without causing disadvantages in terms of the functioning of the belt retractor and In particular, the functionality of the acceleration sensor and the blocking system to be created.
  • the holding part is formed in two parts from a frame part and a core part fixed in the frame part, and the frame part has a greater elasticity than the core part, and the acceleration sensor is held on the core part, and the holding part with the frame part is held on the belt retractor.
  • the advantage of the proposed solution is that the acceleration sensor is held on the core part with the lower elasticity, ie with a higher strength and thus with the higher dimensional stability, while the acoustic decoupling is effected relative to the belt retractor by the more elastic frame part.
  • the core part according to the invention has the lower elasticity and serves the positionally accurate fixation of the acceleration sensor.
  • the core part offers a more dimensionally stable retention approach than would be possible on the frame part.
  • the frame part serves the acoustic decoupling of the holding part and has for this purpose the greater elasticity.
  • the acceleration sensor can be very accurately fixed to fulfill its function and simultaneously decoupled acoustically for noise reduction of the belt retractor.
  • the core part may additionally have a greater density than the frame part, so that in the structure-borne sound transmission from the core part to the frame part due to the different sound propagation velocities in the core part and in the frame part additionally a phase jump or a phase shift occurs, through which the sound transmission on is dampened.
  • the holding part may preferably be held with the frame part on a housing cap of the belt retractor, which serves in addition to the holder of the acceleration sensor to protect the acceleration sensor against external mechanical effects.
  • the housing cap may be formed as a closed cap, so that the acceleration sensor and the associated blocking mechanism are additionally encapsulated acoustically to the outside.
  • the frame part has an insertion compartment accessible on one side by an insertion opening, and the core part is arranged in the insertion compartment of the frame part.
  • the core member to which the acceleration sensor is attached is mounted through the insertion opening in the insertion compartment, so that the core member is then covered outwardly from the frame member except for the insertion opening to all sides outwardly and direct contact of the core member to the belt retractor and thus a structure-borne sound transmission, unless this is specifically desired, is prevented.
  • the frame part is preferably held on the belt retractor such that the insertion opening of the insertion compartment in the fastened position of the frame part is at least partially closed by a fixed surface of the belt retractor. Sen is and the core part is thereby secured against slipping out of the slot.
  • the solid surface may be both the surface to which the frame part is also attached, such as on the housing cap, or be another solid surface of the belt retractor.
  • a particularly easy to assemble and cost-effective connection can thereby be realized by the core part is clipped by a latching connection in the insertion compartment of the frame part.
  • the assembly can be made in particular without tools and automated or semi-automated.
  • the frame part and the core part have mutually aligned openings, and the acceleration sensor is fixed at least in the opening of the core part by means of a retaining pin.
  • the opening in the frame part serves to expose the opening in the core part for insertion of the retaining pin.
  • it can also be used in addition to additionally fix the core part in the region of the opening with respect to the frame part by the core part engages with a shoulder in the opening of the frame part, wherein the opening of the core part is preferably arranged in the paragraph in this case ,
  • At least one of the openings has a profiling on which the acceleration sensor is held in a rotationally fixed manner with respect to a rotation about the longitudinal axis of the retaining pin.
  • the profiling may be formed, for example, by a regularly formed positive locking design such that the acceleration sensor is in different angular positions with respect to the longitudinal axis of the retaining pin can be attached to the core part or on the holding part.
  • the frame part and the core part can preferably be fixed in position relative to one another by intermeshing positive locking configurations.
  • the core part is additionally aligned with respect to the frame part and fixed in the aligned position.
  • the form-locking configurations can be oriented in different directions, and it is not necessary that the core part is thereby aligned in all directions.
  • the core part is aligned so that the opening for attachment of the acceleration sensor has a predetermined position and orientation when the holding part is held on the vehicle-fixed part, so that the attached acceleration sensor with its blocking lever in a defined position and orientation to a toothed wheel of the blocking system is arranged, which in turn is crucial to the functioning of the acceleration sensor.
  • the core part have defined, outwardly projecting contact cams which form defined contact points of the core part on the belt retractor.
  • the contact cams serve to support the core part at predetermined contact surfaces or contact points of the belt retractor, which are selected so that the acceleration sensor is supported at a deflection of its inertial mass and the forced movement of the blocking lever in the predetermined position and orientation of the contact surfaces or contact points and thereby remains in the predetermined arrangement and orientation. Since the contact cams are part of the core part, and the core part according to the invention has a lower elasticity, provide the contact cam aware of dimensionally stable contact points and thereby prevent in particular a tilting the core part relative to the belt retractor or relative to the frame part.
  • the core part may preferably have a mass 7 times greater than the acceleration sensor, whereby the effect of the phase jump and the damping in the structure-borne sound transmission from the core part to the frame part due to the resulting different natural frequencies and
  • the frame part may preferably be formed of a plastic and the core part of a metal.
  • the core part serves the dimensionally stable attachment of the acceleration sensor and should have a high dimensional stability and low elasticity at a high mass at the same time. These requirements are met e.g. the proposed metal.
  • the frame part should be designed to be more elastic than the core part, to which plastic is offered, which also allows a very cost-effective mass production in an injection molding process.
  • FIG. 2 shows an inventive holding part for the acceleration sensor with a frame part and a core part.
  • the belt retractor 1 proposed according to the invention differs from the belt retractor 1 shown in FIG. 1 in that, instead of the blocking mass 5, a retaining part 7 is provided for mounting the acceleration sensor 2, which can be seen in more detail in FIG.
  • the noise damping of the belt retractor 1 is further improved, without this having an adverse effect on the function of the belt retractor 1 and in particular of the acceleration sensor 2 and the blocking system.
  • the holding part 7 is formed in two parts with a frame part 8 and a core part 9.
  • the frame part 8 has a one-sided open insertion compartment 19 with an insertion opening 20, which is formed by four boundary walls and an open in the lateral profile part-circular curved side.
  • the insertion opening 20 is thus limited by two part-circular edges and two perpendicular thereto and parallel to each other aligned edges, wherein the radius of the part-circular edges corresponds to the inner radius of the recognizable in the figure 1 housing cap 10.
  • the insertion opening 20 narrowing elastic locking projections 12 are provided in the insertion compartment 19 of the frame part 8 in the insertion compartment 19 of the frame part 8 are on the edge inwardly projecting. Further, a first circular opening 17 and a second opening 22 are provided on a side surface of the frame part 8.
  • the core part 9 has an outer shape adapted to the shape of the insertion compartment 19 of the frame part 8. Further, on the core part 9, an annular outwardly projecting shoulder 15th provided with a central opening 16 and a profiling 21 provided therein in the form of a regular toothing. In addition, a second outwardly projecting shoulder 14 is provided, which is arranged below the projecting annular shoulder 15.
  • the core part 9 further has a curved outer molding surface, which is arranged so that it faces the insertion opening 20 after the arrangement of the core part 9 in the frame part 8 and does not project beyond the edge sides of the insertion opening 20. On the curved hinderform- surface four outwardly projecting contact cam 13 are provided.
  • the core part 9 with the side on which the lugs 14 and 15 are arranged is first inserted through the insertion opening 20 into the insertion compartment 19 and latched there by means of the latching projections 12 in a latching connection.
  • the contact cam 13 are arranged and sized in height so that they are freely accessible in the mounted position of the core part 9 and the frame part 8 on the belt retractor 1 through the insertion opening 20 and on a corresponding counter surface of the belt retractor 1, ie in this Case on the housing cap 10, abut points.
  • the opening 17 in the frame part 8 and the shoulder 15 with the first opening 16 arranged therein are arranged concentrically or even in alignment with one another, the opening 17 in the frame part 8 engaging the core part 9 with the shoulder
  • the opening 16 serves, and the opening 16 for holding the acceleration Supply sensor 2 is used.
  • the opening 16 has a profiling 21 in the form of a regular toothing with axially directed teeth.
  • the acceleration sensor 2 is inserted for attachment to a retaining pin 18 in the first opening 16 of the core member 9 in a predetermined angular position with respect to its longitudinal axis and is then fixed due to the profiling 21 in this rotational position against further rotation about the longitudinal axis of the retaining pin 18.
  • the retaining pin 18 may have a corresponding counter profile.
  • the profiling 21 creates here a form-locking design, which can be further solidified by the counter-profiling of the retaining pin 18, and which defines the acceleration sensor 2 in the predetermined angular position.
  • the profiling 21 is formed by a regular toothing, the acceleration sensor 2 can be fastened to the core part 9 or the holding part 7 in a large number of angular positions with respect to the longitudinal axis of the retaining pin 18.
  • the core part 9 serves for the positionally accurate fastening of the acceleration sensor 2 in a predetermined arrangement and orientation in the housing cap 10 or to a toothed disk of the blocking system.
  • the core part 9 deliberately has a lower elasticity and dimensional stability than the frame part 8 and may be formed, for example, as a metal part.
  • the frame part 8, however, has a higher elasticity than the core part 9 and is used for acoustic decoupling of the holding part 7 of the housing cap 10. It is sufficient if the frame part 8 has a correspondingly thin wall thickness, since only small vibrations must be compensated, and It should only be prevented that the core part 9 reaches a large area and uncontrolled in contact with the housing cap 10.
  • the core part 9 has defined thereto arranged contact cam 13, via which the core part 9 is selectively supported on the housing cap 10, so that the acceleration sensor 2 is also held in the predetermined orientation and position when acting on the acceleration sensor 2 and its blocking lever forces, for example during the activation of the blocking system.
  • the core part 9 also has a greater density and mass than the frame part 8, so that the vibrations excited by the acceleration sensor 2 are due solely to the high mass of the core part 9 in the
  • the structure-borne sound vibrations are due to the different densities of the core part 9 and the frame part 8 and the consequent different sound propagation speeds in the transition from the core part 9 to the frame part 8 in a phase jump offset and thereby additionally damped.
  • the frame part 8 practically forms an elastic connection of the form-stable core part 9 to the belt retractor 1 while avoiding large-area contact.

Landscapes

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

Abstract

L'invention concerne un enrouleur de ceinture (1) comprenant un capteur d'accélération (2) amortissant les bruits. Le capteur d'accélération (2) est maintenu sur l'enrouleur de ceinture (1) par l'intermédiaire d'une partie de maintien (7) insonorisant les bruits de structure. La partie de maintien (7) est formée en deux parties à partir d'une partie de cadre (8) et d'une partie centrale (9) fixée dans la partie de cadre (8). La partie de cadre (8) présente une élasticité plus importante que la partie centrale (9). Le capteur d'accélération (2) est maintenu sur la partie centrale (9), et la partie de maintien (7) est maintenue sur l'enrouleur de ceinture (1) avec la partie de cadre (8).
PCT/EP2018/055034 2017-03-02 2018-03-01 Enrouleur de ceinture comprenant un capteur d'accélération amortissant les bruits WO2018158361A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017203417.3 2017-03-02
DE102017203417.3A DE102017203417B4 (de) 2017-03-02 2017-03-02 Gurtaufroller mit einem geräuschgedämpften Beschleunigungssensor

Publications (1)

Publication Number Publication Date
WO2018158361A1 true WO2018158361A1 (fr) 2018-09-07

Family

ID=61526819

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/055034 WO2018158361A1 (fr) 2017-03-02 2018-03-01 Enrouleur de ceinture comprenant un capteur d'accélération amortissant les bruits

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Country Link
DE (1) DE102017203417B4 (fr)
WO (1) WO2018158361A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10766452B2 (en) 2016-02-17 2020-09-08 Autoliv Development Ab Self-locking belt retractor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021118420A1 (de) 2021-07-16 2023-01-19 Zf Automotive Germany Gmbh Baugruppe für einen Gurtaufroller sowie Gurtaufroller

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6082655A (en) 1998-11-04 2000-07-04 Trw Vehicle Safety Systems Inc. Noise suppression cover for belt webbing retractor
DE102007049200A1 (de) * 2007-10-13 2009-04-16 Autoliv Development Ab Selbstsperrender Gurtaufroller
DE102009018177A1 (de) 2009-04-22 2010-11-04 Autoliv Development Ab Gurtaufroller mit einem geräuschgedämpften Beschleunigungssensor
US20100301153A1 (en) * 2007-01-24 2010-12-02 Samsong Industries, Ltd. Seatbelt retractor
EP2780201B1 (fr) * 2011-11-18 2016-01-13 Takata AG Capteur

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016202383B4 (de) * 2016-02-17 2018-05-24 Autoliv Development Ab Selbstsperrender Gurtaufroller

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6082655A (en) 1998-11-04 2000-07-04 Trw Vehicle Safety Systems Inc. Noise suppression cover for belt webbing retractor
US20100301153A1 (en) * 2007-01-24 2010-12-02 Samsong Industries, Ltd. Seatbelt retractor
DE102007049200A1 (de) * 2007-10-13 2009-04-16 Autoliv Development Ab Selbstsperrender Gurtaufroller
DE102009018177A1 (de) 2009-04-22 2010-11-04 Autoliv Development Ab Gurtaufroller mit einem geräuschgedämpften Beschleunigungssensor
EP2780201B1 (fr) * 2011-11-18 2016-01-13 Takata AG Capteur

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10766452B2 (en) 2016-02-17 2020-09-08 Autoliv Development Ab Self-locking belt retractor

Also Published As

Publication number Publication date
DE102017203417B4 (de) 2020-09-10
DE102017203417A1 (de) 2018-09-06

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