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)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34672594

Family Applications (1)

Country Status (7)

Families Citing this family (3)

Family Cites Families (15)

• 2003
  • 2003-12-11 DE DE10357979A patent/DE10357979B4/de not_active Expired - Lifetime
• 2004
  • 2004-12-06 US US10/574,735 patent/US20080246266A1/en not_active Abandoned
  • 2004-12-06 WO PCT/EP2004/053276 patent/WO2005056349A1/de active Application Filing
  • 2004-12-06 EP EP04804682A patent/EP1692021A1/de not_active Withdrawn
  • 2004-12-06 CA CA2543494A patent/CA2543494C/en active Active
  • 2004-12-06 KR KR1020067006848A patent/KR20060105744A/ko not_active Application Discontinuation
  • 2004-12-06 JP JP2006543537A patent/JP2007516128A/ja active Pending
• 2010
  • 2010-08-31 US US12/872,662 patent/US20100320303A1/en not_active Abandoned

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events