Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F42—AMMUNITION; BLASTING
  • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
  • F42B3/00—Blasting cartridges, i.e. case and explosive
  • F42B3/04—Blasting cartridges, i.e. case and explosive for producing gas under pressure
• • 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
  • B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
  • B60R22/4628—Reels with means to tension the belt in an emergency by forced winding up characterised by fluid actuators, e.g. pyrotechnic gas generators
• • 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
  • B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
  • B60R22/4628—Reels with means to tension the belt in an emergency by forced winding up characterised by fluid actuators, e.g. pyrotechnic gas generators
  • B60R2022/4657—Reels with means to tension the belt in an emergency by forced winding up characterised by fluid actuators, e.g. pyrotechnic gas generators comprising a plurality of charges

Definitions

• the invention relates to a pyrotechnic drive device for a belt tensioner, with a formed in a housing
• the pyrotechnic propellant charge is designed for vehicle occupants of average body weight.
• the belt is the same for both small and large occupants
• Body weight can be achieved with a smaller firming force than with
• the invention creates a pyrotechnic drive device for a belt tensioner, the drive energy in several
• At least two propellant charges arranged in separate receiving spaces of the housing and separately or simultaneously ignitable are provided, and both
• Recording spaces are connected to the work space, preferably by means of separate connecting channels converging near the work space.
• only one of the two propellant charges is activated in order to tighten the tension - -
• both propellant charges are activated in order to tighten the belt with particularly high force.
• a different dimensioning of the two propellant charges is particularly expedient, so that three different energy levels are possible with only two propellant charges. It is advisable to measure one propellant charge with 40% and the other with 60% of the maximum drive energy of 100%, which is then achieved by activating both propellant charges at the same time.
• the respective body weight can be detected by a seat occupancy sensor and the intensity of the accident can be measured with a conventional crash sensor. Both sensors are connected to an electronic trigger device that activates the
• the drive device is, in particular, a lamellar rotor rotary drive; in principle, however, the invention can also be used with different types of drive devices.
• Figure 1 is a plan view of a multi-disc rotor rotary drive with the cover removed.
• Fig. 2 is a side view of the completed with cover part
• Multi-disc rotor rotary drive according to Fig. 1;
• FIG. 3 shows an exploded view of the housing body and cover part of the lamella rotor rotary drive
• FIG. 4 shows a longitudinal section through a pyrotechnic gas generator in a receiving space of the cover part; 5 shows an embodiment variant of the gas generator;
• FIGS. 6 and 7 views analogous to FIGS. 4 and 5, but according to two further embodiment variants;
• FIG. 8 is a plan view of the bottom of the capsule of a gas generator
• Fig. 9 is a sectional view in the area of the gas generator floor after activation of the propellant charge.
• the pyrotechnic drive device shown as a preferred embodiment is a lamellar rotor rotary drive. Its housing consists of a main body 10 and a cover part attached to a stop surface 12 of the main body 10
• a chamber 16 is formed in the main body 10, in which a vane rotor 18 with radially displaceable fins 20 is rotatably received.
• a lateral shaft extension 22 has a serration for connection to a belt retractor (not shown).
• a working space 24 and two channels 26, 28, which are initially separate but then converging and merging into the working space 24, are left out of the stop surface 12 of the main body 10. In the rest position shown in Fig. 1 is one of the
• Slats 20, which closes the working space 24 at its end facing away from the channels 26, 28, are fixed to the main body 10 of the housing by means of a shear pin 30.
• the cover part 14 is provided with a lateral extension 14a, which has two cylindrical receiving spaces 32, 34. A cartridge-shaped gas generator 36 or 38 is inserted into each of these receiving spaces 32, 34.
• the cover part 14 is also provided on its side facing the stop surface 12 of the main body 10 with a molded strip 42 which starts from the receiving spaces 32, 34 and is designed to match the shape of the channels 26, 28 and the working space 24, so that they are at placed on the main body 10 - -
• Cover part 14 engages appropriately in the space formed by the channels 26, 28 and the working space 24.
• This strip 42 has a sealing function. It forms an axial boundary of the channels 26, 28 and the working space 24, so that their axial dimension results from the difference between their axial depth and the axial height of the bar 42.
• each cartridge-shaped gas generator consists of a capsule 44 and a propellant charge 46 enclosed therein.
• An electrical igniter 48 is also embedded in the propellant charge 46.
• the capsule 44 has at its one axial end an outwardly curved base 50 and at its opposite end a base 53 which is sealed off from the cylindrical part of the capsule 44 by means of ring seals 54.
• the curved bottom 50 is provided on the inside with predetermined breaking lines arranged in a star shape.
• the base 50a of the capsule 44a can also project outwards in a conical shape.
• both versions 50 or 50a of the capsule base it withstands a high gas pressure acting from the outside, which occurs when the other gas generator is ignited. Since the channels 26, 28 converge on the working space 24, when one gas generator is ignited, the other is exposed to the pressure and the heat of the gases generated. Since the capsule base 50 or 50a withstands these stresses, unintentional ignition of the other gas generator is reliably avoided. However, since the capsule base in both versions is concave with respect to the inside of the gas generator, it is opened slightly when the propellant charge 46 is activated and changes from the closed state shown in FIG. 8 to the open state shown in FIG. 9.
• a separate protective part 52 or 52 a is provided, which extends into a radial extension of the receiving space 32 or 34 between the bottom of the gas generator 36 or 38 and the channel 28 or 26 is used.
• the protective part 52 is curved in accordance with the embodiment according to FIG. 4, while the protective part 52a is conical in accordance with the embodiment of FIG. 5.
• the gas generators 36, 38, the propellant charges of which are of different sizes can be ignited separately individually or simultaneously.
• a seat occupancy sensor and a crash sensor are connected to this release device.
• the seat occupancy signal is representative of the body weight or size of the vehicle occupant, and the signal of the crash sensor is a measure of the intensity of the accident.
• the trigger device uses these signals to determine the gas generators to be ignited for an optimal tightening process in accordance with pre-programmed criteria.
• a further receiving space and connecting channel for a third gas generator are indicated by dashed lines in FIG. 1.
• three power levels can be provided, which ensure an optimal tightening process in almost all cases.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Automotive Seat Belt Assembly (AREA)
• Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=8024633

Family Applications (1)

Country Status (6)

Families Citing this family (9)

Family Cites Families (4)

• 1996
  • 1996-05-31 DE DE29609691U patent/DE29609691U1/de not_active Expired - Lifetime
• 1997
  • 1997-05-30 WO PCT/EP1997/002839 patent/WO1997045300A1/de not_active Ceased
  • 1997-05-30 CZ CZ98279A patent/CZ27998A3/cs unknown
  • 1997-05-30 KR KR1019980700665A patent/KR19990036001A/ko not_active Withdrawn
  • 1997-05-30 EP EP97927093A patent/EP0836565A1/de not_active Withdrawn
  • 1997-05-30 JP JP9541631A patent/JPH11510458A/ja active Pending

Non-Patent Citations (1)

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