EP1692021A1 - Torsion bar for application in belt winders for safety belts - Google Patents

Torsion bar for application in belt winders for safety belts

Info

Publication number
EP1692021A1
EP1692021A1 EP04804682A EP04804682A EP1692021A1 EP 1692021 A1 EP1692021 A1 EP 1692021A1 EP 04804682 A EP04804682 A EP 04804682A EP 04804682 A EP04804682 A EP 04804682A EP 1692021 A1 EP1692021 A1 EP 1692021A1
Authority
EP
European Patent Office
Prior art keywords
torsion bar
drive
blocking elements
bar according
torsion
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP04804682A
Other languages
German (de)
French (fr)
Inventor
Siegfried Oesterle
Ernst Sieber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SFS Group International AG
Original Assignee
SFS Intec Holding AG
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 SFS Intec Holding AG filed Critical SFS Intec Holding AG
Publication of EP1692021A1 publication Critical patent/EP1692021A1/en
Withdrawn legal-status Critical Current

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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
    • 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
    • B60R22/28—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/14—Torsion springs consisting of bars or tubes
    • 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
    • B60R22/28—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices
    • B60R2022/286—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices using deformation of material
    • B60R2022/287—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices using deformation of material of torsion rods or tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2304/00—Optimising design; Manufacturing; Testing
    • B60Y2304/03—Reducing weight

Definitions

  • the invention relates to a torsion bar for use in belt retractors for seat belts, at the end regions of which there are provided training elements with drive and / or blocking elements for positive connection with corresponding devices.
  • torsion bars A number of design variants of torsion bars have become known, all of which are produced from steels and steel alloys in a cold forming process. Since the torsion bars between the drive and / or blocking elements have to be manufactured with different diameters in accordance with the requirements of the torsion behavior, but the degree of deformation during cold forming only allows certain diameter ratios between the torsion bar and the drive and / or blocking elements, it was generally inevitable In addition to the cold forming, a machining of the material has to be carried out so that, despite the constant diameter of the drive and / or blocking elements, a much smaller diameter of the torsion bar itself could be created.
  • the invention has therefore set itself the task of creating a torsion bar for use in belt retractors, which is made in one piece with drive and / or blocking elements formed at its end regions, which corresponds to the requirement for low-temperature behavior and can also be produced without machining.
  • the torsion bar including the drive and / or blocking elements formed at its ends are used to achieve different torques with the same size of the drive and / or blocking elements and variable diameters of the torsion bar in a cold forming process is made in one piece from a non-ferrous metal using the different extrusion pressures.
  • the pressing problems can be easily solved, since an adaptation of the diameters of drive and / or blocking elements and torsion bar is possible by using the different extrusion behavior of various materials. It has therefore again become possible to adapt to the extent that the end product can be produced without machining material.
  • the drive and / or blocking elements formed at the ends have the same or larger external dimensions than the torsion bar itself.
  • the material used according to the invention also makes it possible to have a very small diameter difference, so that cold-forming production can also be used optimally.
  • a particularly advantageous embodiment is when the torsion bar is made from aluminum in a cold forming process.
  • Aluminum has an extrusion behavior similar to that of an unannealed steel. However, a strength behavior with torsion is achieved here, which has only become possible with steel with very small diameters. Then however, the extrusion behavior for steel is an obstacle to using cold forming. Then subsequent machining is to be carried out. This can be avoided with aluminum, since the differences in diameter between the torsion bar and the drive and / or blocking elements can be kept small.
  • the best formability for the production of a torsion bar is given when up to 99.5 vol .-% pure aluminum is used.
  • the extrusion behavior of almost pure aluminum is particularly suitable for the production of a torsion bar using the cold forming process.
  • the torsion bar As a result of the good formability and the extrusion behavior of non-ferrous metals and here in particular of aluminum or copper for example, it has also become possible in a simple manner for the torsion bar to be cylindrical or prismatic.
  • the drive and / or blocking elements are designed as gear wheels or as driving elements provided with flats.
  • FIG. 1 shown is an example of a torsion bar with drive and / or blocking elements formed at its ends.
  • the torsion bar 1 shown is used for belt retractors for seat belts.
  • Drive and / or blocking elements 2 and 3 are provided at the end regions thereof, which in turn can be coupled to corresponding devices in order to ner special load on the seat belt to allow one or multiple torsion of the torsion bar and thereby act as a kind of shock absorber.
  • the torsion bar 1, including the drive and / or blocking elements 2 and 3 formed at its ends, is made in one piece from a non-ferrous metal using a different non-ferrous metal in order to achieve different torques with the same size of the drive and / or blocking elements and variable diameters of the torsion bar Extrusion manufactured.
  • the drive and / or blocking elements 2 and 3 formed at the ends have outer dimensions of the same size or larger than the torsion bar 1 itself.
  • non-ferrous metals essentially means light metals and non-ferrous metals.
  • copper is a suitable material from the non-ferrous metals sector.
  • aluminum is particularly advantageous for producing a torsion bar in a cold forming process. Up to 99.5% by volume of pure aluminum is expediently used.
  • the torsion bar 1 can e.g. be cylindrical or prismatic.
  • the drive and / or blocking elements 2 and 3 can be designed as gear wheels or as flanged driving elements. Between the drive and / or blocking elements 2 or 3 and the torsion bar 1, a transition 4 in the form of a conical section or a fillet can be formed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Automotive Seat Belt Assembly (AREA)
  • Springs (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

The invention relates to a torsion bar (1), for application in belt winders for safety belts, provided on the end sections thereof with embodiments of drive and/or locking elements (2, 3), for positive connection to the corresponding devices. The torsion bar (1) and the drive and /or locking elements (2, 3) embodied on the ends thereof is produced in one piece from a non-ferrous metal, using varying extrusions in order to achieve differing torques with constant dimensions for the drive and /or locking elements (2, 3) with variable diameters for the torsion bar (1).

Description

Beschreibung: Description:
Die Erfindung betrifft einen Torsionsstab zum Einsatz bei Gurtaufrollern für Sicherheitsgurte, an dessen Endbereichen Ausbildungen mit Antriebs- und/oder Blockierelementen zum formschlüssigen Verbinden mit entsprechenden Vorrichtungen vorgesehen sind.The invention relates to a torsion bar for use in belt retractors for seat belts, at the end regions of which there are provided training elements with drive and / or blocking elements for positive connection with corresponding devices.
Es sind eine Reihe von Ausführungsvarianten von Torsionsstäbe n bekannt geworden, welche alle aus Stählen und Stahllegierungen in einem Kaltumformverfahren hergestellt werden. Da die Torsionsstäbe zwischen den Antriebs- und/oder Blockierelementen entsprechend den Anforderungen an das Torsionsverhalten mit verschiedenem Durchmesser hergestellt werden müssen, der Umformgrad beim Kaltumformen jedoch nur bestimmte Durchmesserverhältnisse zwischen Torsionsstab und Antriebs- und/oder Blockierelementen zulässt, war es in der Regel unumgänglich, neben der Kaltumformung auch noch eine spanende Materialabarbeitung vorzunehmen, damit trotz gleichbleibendem Durchmesser der Antriebs- und/oder Blockierelemente ein wesentlich kleinerer Durchmesser des Torsionsstabes selbst geschaffen werden konnte.A number of design variants of torsion bars have become known, all of which are produced from steels and steel alloys in a cold forming process. Since the torsion bars between the drive and / or blocking elements have to be manufactured with different diameters in accordance with the requirements of the torsion behavior, but the degree of deformation during cold forming only allows certain diameter ratios between the torsion bar and the drive and / or blocking elements, it was generally inevitable In addition to the cold forming, a machining of the material has to be carried out so that, despite the constant diameter of the drive and / or blocking elements, a much smaller diameter of the torsion bar itself could be created.
Zudem gibt es bei Torsionsstäben kaum behebbare Probleme beim Tieftemperaturverhalten des Torsionsstabmateriales in üblichem Stahl, das heißt, die Torsionsstäbe brechen viel zu früh. Die Forderung der Automobilindustrie nach dem Tieftemperaturverhalten, nämlich mindestens 5,5 Umdrehungen bei -35°C, steht bereits. Hier ergeben sich zusätzliche Probleme bei im Kaltumformverfahren hergestellten Torsionsstäben aus Stahl.In addition, with torsion bars there are hardly any fixable problems with the low-temperature behavior of the torsion bar material in conventional steel, which means that the torsion bars break much too early. The automotive industry is already demanding low-temperature behavior, namely at least 5.5 revolutions at -35 ° C. This creates additional problems with steel torsion bars produced using the cold forming process.
Die Erfindung hat sich daher zur Aufgabe gestellt, einen Torsionsstab zum Einsatz bei Gurtaufrollern zu schaffen, der einstückig mit an dessen Endbereichen ausgebildeten Antriebs- und/oder Blockierelementen gefertigt ist, welcher der Forderung nach dem Tieftemperaturverhalten entspricht und außerdem ohne spanende Nachbearbeitung herstellbar ist.The invention has therefore set itself the task of creating a torsion bar for use in belt retractors, which is made in one piece with drive and / or blocking elements formed at its end regions, which corresponds to the requirement for low-temperature behavior and can also be produced without machining.
Dies wird erfindungsgemäß dadurch erreicht, dass der Torsionsstab einschließlich der an dessen Enden ausgebildeten Antriebs- und/oder Blockierelemente zur Erzielung unter- schiedlicher Drehmomente bei gleichbleibender Größe der Antriebs- und/oder Blockierelemente und variablen Durchmessern des Torsionsstabes in einem Kaltumformverfahren einstückig aus einem Nichteisenmetall unter Ausnützung der unterschiedlichen Fließpressung gefertigt ist.This is achieved according to the invention in that the torsion bar including the drive and / or blocking elements formed at its ends are used to achieve different torques with the same size of the drive and / or blocking elements and variable diameters of the torsion bar in a cold forming process is made in one piece from a non-ferrous metal using the different extrusion pressures.
Durch diese erfindungsgemäßen Maßnahmen können die presstechnischen Probleme einfach gelöst werden, da eine Anpassung der Durchmesser von Antriebs- und/oder Blockierelementen und Torsionsstab möglich ist unter Ausnutzung des unterschiedlichen Fliesspressverhaltens diverser Materialen. Es ist daher wieder eine Anpassung insoweit möglich geworden, als das Endprodukt ohne spanende Materialbearbeitung herstellbar ist.With these measures according to the invention, the pressing problems can be easily solved, since an adaptation of the diameters of drive and / or blocking elements and torsion bar is possible by using the different extrusion behavior of various materials. It has therefore again become possible to adapt to the extent that the end product can be produced without machining material.
Weitere Vorteile ergeben sich dadurch, dass unter Umständen eine wesentliche G e- wichtseinsparung gegeben ist. Ferner ist kein Korrosionsschutz notwendig. Je nach einzusetzendem Nichteisenmetall kann die Standzeit der Werkzeuge für die Kaltumformung bei der Torsionsstabfertigung wesentlich verbessert werden.Further advantages result from the fact that under certain circumstances there is a substantial weight saving. Furthermore, no corrosion protection is necessary. Depending on the non-ferrous metal to be used, the service life of the tools for cold forming in torsion bar production can be significantly improved.
Bezüglich der Antriebs- und/oder Blockierelemente sind festgelegte Dimensionen vorgegeben. Eine presstechnische Anpassung des Durchmessers des Torsionsstabes ist durch den Einsatz eines Nichteisenmetalls erzielt worden. Dabei ist es nicht einfach ein Materialaustausch, sondern es bedurfte dazu einer Reihe von erfinderischen Schritten, um die Möglichkeiten bei der Kaltumformung zu erreichen, um die Durchmesserverhältnisse aufeinander anpassbar zu machen und um überhaupt ein in diesen Dimensionen kaltum- formbares Material zu finden, welches außerdem noch die erforderlichen Drehmomente im Bereich des Torsionsstabes und auch im Bereich der Antriebs- und/oder Blockierelemente mit sich bringt.Fixed dimensions are specified with regard to the drive and / or blocking elements. A press-technical adjustment of the diameter of the torsion bar has been achieved by using a non-ferrous metal. It is not simply a matter of exchanging materials, but it took a number of inventive steps to achieve the possibilities in cold forming, to make the diameter ratios adaptable to one another and to find a material that could be cold formed in these dimensions, which also still brings the required torques in the area of the torsion bar and also in the area of the drive and / or blocking elements.
Weiter wird vorgeschlagen, dass die an den Enden ausgebildeten Antriebs- und/oder Blockierelemente gleich große oder größere Außenabmessungen aufweisen als der Torsionsstab selbst. Durch das erfindungsgemäß eingesetzte Material ist auch ein sehr geringer Durchmesserunterschied möglich, so dass auch die kaltumformende Fertigung optimal einsetzbar ist.It is further proposed that the drive and / or blocking elements formed at the ends have the same or larger external dimensions than the torsion bar itself. The material used according to the invention also makes it possible to have a very small diameter difference, so that cold-forming production can also be used optimally.
Eine besonders vorteilhafte Ausgestaltung liegt vor, wenn der Torsionsstab in einem Kaltumformverfahren aus Aluminium gefertigt ist. Aluminium hat etwa ein Fließpressverhalten wie ein ungeglühter Stahl. Es wird hier aber ein Festigkeitsverhalten bei der Torsion erreicht, welches bei Stahl erst bei sehr kleinen Durchmessern möglich geworden ist. Dann ist aber das Fließpressverhalten bei Stahl ein Hindernis, eine Kaltumformung anzuwenden. Dann ist nämlich eine nachträgliche spanende Bearbeitung durchzuführen. Dies kann bei Aluminium ganz klar unterbleiben, da die Durchmesserunterschiede zwischen Torsionsstab und Antriebs- und/oder Blockierelementen klein gehalten werden können.A particularly advantageous embodiment is when the torsion bar is made from aluminum in a cold forming process. Aluminum has an extrusion behavior similar to that of an unannealed steel. However, a strength behavior with torsion is achieved here, which has only become possible with steel with very small diameters. Then However, the extrusion behavior for steel is an obstacle to using cold forming. Then subsequent machining is to be carried out. This can be avoided with aluminum, since the differences in diameter between the torsion bar and the drive and / or blocking elements can be kept small.
Die optimalste Umformbarkeit für die Fertigung eines Torsionsstabes ist dann gegeben, wenn bis zu 99,5 Vol.-% reines Aluminium eingesetzt ist. Das Fließpressverhalten von nahezu reinem Aluminium ist gerade für die Fertigung eines Torsionsstabes im Kaltumformverfahren besonders geeignet.The best formability for the production of a torsion bar is given when up to 99.5 vol .-% pure aluminum is used. The extrusion behavior of almost pure aluminum is particularly suitable for the production of a torsion bar using the cold forming process.
Infolge des guten Umformbarkeit und des Fließpressverhaltens von Nichteisenmetallen und hier insbesondere von Aluminium oder beispielsweise von Kupfer ist es auch in einfacher Weise möglich geworden, dass der Torsionsstab zylindrisch oder prismatisch ausgebildet ist.As a result of the good formability and the extrusion behavior of non-ferrous metals and here in particular of aluminum or copper for example, it has also become possible in a simple manner for the torsion bar to be cylindrical or prismatic.
Durch die optimale Fertigungsmöglichkeit mit dem speziell angepassten Material ist es noch leichter, verschiedene konstruktive Varianten des Torsionsstabes und auch der Antriebs- und/oder Blockierelemente zu schaffen. Demnach kann vorgesehen werden, dass die Antriebs- und/oder Blockierelemente als Zahnräder oder als mit Abflachungen versehene Mitnahmeelemente ausgebildet sind.Due to the optimal production possibility with the specially adapted material, it is even easier to create different structural variants of the torsion bar and also of the drive and / or blocking elements. Accordingly, it can be provided that the drive and / or blocking elements are designed as gear wheels or as driving elements provided with flats.
In diesem Zusammenhang ist es aber auch möglich geworden, dass zwischen den Antriebs- und/oder Blockierelementen und dem Torsionsstab ein Übergang in Form eines Kegelabschnittes oder einer Hohlkehle ausgebildet ist. Es lassen sich also durch den Einsatz eines Nichteisenmetalles und insbesondere eines Leichtmetalls wie Aluminium ideale konstruktive Gestaltungen mit optimalem Torsionsverhalten und auch mit optimaler Kraftübertragung bei den Antriebs- und/oder Blockierelementen erzielen.In this context, it has also become possible for a transition in the form of a conical section or a groove to be formed between the drive and / or blocking elements and the torsion bar. The use of a non-ferrous metal and in particular a light metal such as aluminum can therefore achieve ideal structural designs with optimum torsional behavior and also with optimal power transmission in the drive and / or blocking elements.
Weitere erfindungsgemäße Merkmale und besondere Vorteile werden in der nachstehenden Beschreibung anhand der Zeichnung noch näher erläutert:Further features according to the invention and special advantages are explained in more detail in the following description with reference to the drawing:
Die dargestellte Figur 1 ist ein Beispiel eines Torsionsstabes mit an dessen Enden ausgebildeten Antriebs- und/oder Blockierelementen.FIG. 1 shown is an example of a torsion bar with drive and / or blocking elements formed at its ends.
Der dargestellte Torsionsstab 1 dient zum Einsatz bei Gurtaufrollern für Sicherheitsgurte. An dessen Endbereichen sind Antriebs- und/oder Blockierelemente 2 bzw. 3 vorgesehen, welche wiederum mit entsprechenden Vorrichtungen kuppelbar sind, um dadurch bei ei- ner besonderen Belastung des Sicherheitsgurtes eine ein- oder mehrfache Torsion des Torsionsstabes zu ermöglichen und dadurch als ein Art Stoßdämpfer zu wirken. Der Torsionsstab 1 einschließlich der an dessen Enden ausgebildeten Antriebs- und/oder Blockierelemente 2 bzw. 3 ist zur Erzielung unterschiedlicher Drehmomente bei gleichbleibender Größe der Antriebs- und/oder Blockierelemente und variablen Durchmessern des Torsionsstabes in einem Kaltumformverfahren einstückig aus einem Nichteisenmetall unter Ausnützung der unterschiedlichen Fließpressung gefertigt.The torsion bar 1 shown is used for belt retractors for seat belts. Drive and / or blocking elements 2 and 3 are provided at the end regions thereof, which in turn can be coupled to corresponding devices in order to ner special load on the seat belt to allow one or multiple torsion of the torsion bar and thereby act as a kind of shock absorber. The torsion bar 1, including the drive and / or blocking elements 2 and 3 formed at its ends, is made in one piece from a non-ferrous metal using a different non-ferrous metal in order to achieve different torques with the same size of the drive and / or blocking elements and variable diameters of the torsion bar Extrusion manufactured.
Die an den Enden ausgebildeten Antriebs- und/oder Blockierelemente 2 bzw. 3 weisen gleich große oder größere Außenabmessungen auf als der Torsionsstab 1 selbst.The drive and / or blocking elements 2 and 3 formed at the ends have outer dimensions of the same size or larger than the torsion bar 1 itself.
Unter dem Begriff Nichteisenmetalle werden für die vorliegende Erfindung im Wesentlichen Leichtmetalle und Buntmetalle verstanden. Aus dem Bereich Buntmetalle ist zum Beispiel Kupfer ein geeigneter Werkstoff. Bei den Leichtmetallen ist insbesondere Aluminium vorteilhaft, um einen Torsionsstab in einem Kaltumformverfahren zu fertigen. Zweckmäßig wird dabei ein bis zu 99,5 Vol.-% reines Aluminium eingesetzt ist.For the present invention, the term “non-ferrous metals” essentially means light metals and non-ferrous metals. For example, copper is a suitable material from the non-ferrous metals sector. In the case of the light metals, aluminum is particularly advantageous for producing a torsion bar in a cold forming process. Up to 99.5% by volume of pure aluminum is expediently used.
In konstruktiver Hinsicht sind durch die neu eingesetzten Werkstoffe wesentliche Verbesserungen möglich geworden. Der Torsionsstab 1 kann z.B. zylindrisch oder prismatisch ausgebildet sein. Die Antriebs- und/oder Blockierelemente 2 bzw. 3 können als Zahnräder oder als mit Abflachungen versehene Mitnahmeelemente ausgebildet sein. Zwischen den Antriebs- und/oder Blockierelementen 2 bzw. 3 und dem Torsionsstab 1 kann ein Übergang 4 in Form eines Kegelabschnittes oder einer Hohlkehle ausgebildet sein.In terms of design, the newly used materials have made significant improvements possible. The torsion bar 1 can e.g. be cylindrical or prismatic. The drive and / or blocking elements 2 and 3 can be designed as gear wheels or as flanged driving elements. Between the drive and / or blocking elements 2 or 3 and the torsion bar 1, a transition 4 in the form of a conical section or a fillet can be formed.
Im Rahmen der Erfindung sind natürlich noch weitere Ausgestaltungen möglich, die sich aus dem Einsatz von Nichteisenmetallen und hier insbesondere Aluminium bei der Herstellung von Torsionsstäben in einem Kaltumformverfahren ergeben. Es kann dadurch in optimaler Weise der Forderung aus dem Automobilbau nach dem Tieftemperaturverhalten des Torsionsstabmaterials entsprochen werden. Within the scope of the invention, further configurations are of course possible, which result from the use of non-ferrous metals and here in particular aluminum in the production of torsion bars in a cold forming process. It can thus optimally meet the requirement from automotive engineering for the low-temperature behavior of the torsion bar material.

Claims

Patentansprüche: claims:
1. Torsionsstab zum Einsatz bei Gurtaufrollern für Sicherheitsgurte, an dessen Endbereichen Ausbildungen mit Antriebs- und/oder Blockierelementen zum formschlüssigen Verbinden mit entsprechenden Vorrichtungen vorgesehen sind, dadurch gekennzeichnet, dass der Torsionsstab (1) einschließlich der an dessen Enden ausgebildeten Antriebsund/oder Blockierelemente (2, 3) zur Erzielung unterschiedlicher Drehmomente bei gleichbleibender Größe der Antriebs- und/oder Blockierelemente (2, 3) und variablen Durchmessern des Torsionsstabes (1) in einem Kaltumformverfahren einstückig aus einem Nichteisenmetall unter Ausnützung der unterschiedlichen Fliesspressung gefertigt ist.1.Torsion bar for use in belt retractors for seat belts, at the end regions of which are provided with drive and / or blocking elements for positive connection with corresponding devices, characterized in that the torsion bar (1) including the drive and / or blocking elements formed at its ends ( 2, 3) to achieve different torques with the same size of the drive and / or blocking elements (2, 3) and variable diameters of the torsion bar (1) in a cold forming process made in one piece from a non-ferrous metal using the different extrusion pressures.
2. Torsionsstab nach Anspruch 1 , dadurch gekennzeichnet, dass die an den Enden ausgebildeten Antriebs- und/oder Blockierelemente (2, 3) gleich große oder größere Außenabmessungen aufweisen als der Torsionsstab (1) selbst.2. Torsion bar according to claim 1, characterized in that the drive and / or blocking elements (2, 3) formed at the ends have the same or larger external dimensions than the torsion bar (1) itself.
3. Torsionsstab nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Torsionsstab (1) in einem Kaltumformverfahren aus Aluminium gefertigt ist.3. Torsion bar according to claim 1 or 2, characterized in that the torsion bar (1) is made of aluminum in a cold forming process.
4. Torsionsstab nach Anspruch 1, dadurch gekennzeichnet, dass bis zu 99,5 Vol.-% reines Aluminium eingesetzt ist.4. Torsion bar according to claim 1, characterized in that up to 99.5 vol .-% pure aluminum is used.
5. Torsionsstab nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Torsionsstab (1) zylindrisch oder prismatisch ausgebildet ist.5. Torsion bar according to one of claims 1 to 4, characterized in that the torsion bar (1) is cylindrical or prismatic.
6. Torsionsstab nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Antriebs- und/oder Blockierelemente (2, 3) als Zahnräder oder als mit Abflachungen versehene Mitnahmeelemente ausgebildet sind.6. Torsion bar according to one of claims 1 to 5, characterized in that the drive and / or blocking elements (2, 3) are designed as gear wheels or as flattened driving elements.
7. Torsionsstab nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass zwischen den Antriebs- und/oder Blockierelementen (2, 3) und dem Torsionsstab (1) ein Übergang (4) in Form eines Kegelabschnittes oder einer Hohlkehle ausgebildet ist. 7. Torsion bar according to one of claims 1 to 6, characterized in that between the drive and / or blocking elements (2, 3) and the torsion bar (1) a transition (4) is formed in the form of a conical section or a groove.
EP04804682A 2003-12-11 2004-12-06 Torsion bar for application in belt winders for safety belts Withdrawn EP1692021A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10357979A DE10357979B4 (en) 2003-12-11 2003-12-11 Torsion bar for use with belt retractors for safety belts
PCT/EP2004/053276 WO2005056349A1 (en) 2003-12-11 2004-12-06 Torsion bar for application in belt winders for safety belts

Publications (1)

Publication Number Publication Date
EP1692021A1 true EP1692021A1 (en) 2006-08-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP04804682A Withdrawn EP1692021A1 (en) 2003-12-11 2004-12-06 Torsion bar for application in belt winders for safety belts

Country Status (7)

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US (2) US20080246266A1 (en)
EP (1) EP1692021A1 (en)
JP (1) JP2007516128A (en)
KR (1) KR20060105744A (en)
CA (1) CA2543494C (en)
DE (1) DE10357979B4 (en)
WO (1) WO2005056349A1 (en)

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CN107120374B (en) * 2017-03-23 2019-02-15 南京工程学院 A kind of automobile-used torsion-bar spring and its manufacturing method

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Also Published As

Publication number Publication date
CA2543494A1 (en) 2005-06-23
WO2005056349A1 (en) 2005-06-23
CA2543494C (en) 2012-01-17
DE10357979A1 (en) 2005-07-21
US20080246266A1 (en) 2008-10-09
US20100320303A1 (en) 2010-12-23
KR20060105744A (en) 2006-10-11
DE10357979B4 (en) 2006-10-05
JP2007516128A (en) 2007-06-21

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