WO1997028994A1 - Energy absorbing force limiter device - Google Patents
Energy absorbing force limiter device Download PDFInfo
- Publication number
- WO1997028994A1 WO1997028994A1 PCT/FR1997/000264 FR9700264W WO9728994A1 WO 1997028994 A1 WO1997028994 A1 WO 1997028994A1 FR 9700264 W FR9700264 W FR 9700264W WO 9728994 A1 WO9728994 A1 WO 9728994A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- linked
- piston
- fuse
- reel
- composite
- Prior art date
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
- B60R22/28—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices
-
- 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
- B60R22/18—Anchoring devices
- B60R22/195—Anchoring devices with means to tension the belt in an emergency, e.g. means of the through-anchor or splitted reel type
- B60R22/1954—Anchoring devices with means to tension the belt in an emergency, e.g. means of the through-anchor or splitted reel type characterised by fluid actuators, e.g. pyrotechnic gas generators
- B60R22/1955—Linear actuators
-
- 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
- B60R22/4676—Reels with means to tension the belt in an emergency by forced winding up comprising energy-absorbing means operating between belt reel and retractor frame
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
- C06C9/00—Chemical contact igniters; Chemical lighters
Definitions
- the objective of the energy-absorbing composite seat belt limiting system is to remedy all or some of these major drawbacks.
- the basic SYLEC system can be schematized as follows (fig. 1).
- a fuse (1) made of preferably woven composite materials is placed in a mechanical assembly (2) between a crushing piston (3) and a support base (4).
- this fuse will preferably begin to destroy at its end in contact with the piston if, and only if the tension force of the belt on the piston is greater than a determined limit value. This value is related to the resistance of the thorax.
- the SYLEC system is placed between the rigid connection point of the seat structure or of the vehicle and the belt or its retractor, or its retractor.
- the seat belt has the following characteristics thanks to the invention: Let Fa (t) be the bearing force between the chest and the seat belt if the latter was locked. As soon as Fa (t) is equal to the limit value tolerated by the thorax Fe, the composite material fuse begins to crush, presenting a force of resistance to compression Fc which induces, at the level of the thorax - belt connection, a chosen force Fd, less than or equal to Fe.
- this force Fc is constant, precise and reproducible.
- this crushing of the fuse under controlled effort allows the extension of the belt by limiting the effort on the thorax to a force less than or equal to the limit value and by retaining the advance of the upper body with this same strength.
- the upper body is sufficiently restrained not to strike the steering wheel, the dashboard, the windshield or the front seat backrests for rear passengers.
- destruction of the composite fuse is also sequential and allows optimization of the upper body retention.
- the present invention can equip either belts with or without pyrotechnic retractor or retractor with pyrotechnic pretensioner.
- the present invention may be in the form of a complete mechanical assembly which is placed either between the belt possibly fitted with its pretensioning equipment, and the attachment to the structure of the vehicle (boards, uprights, seats, etc.), either within the pretensioning or blocking system.
- the present invention can also be integrated into the pretensioning or blocking equipment of the belt.
- Fig. 2 SYLEC independent base, placed between the vehicle structure and the belt or one of its pretensioning or blocking equipment.
- Fig. 3 SYLEC integrated in a pyrotechnic belt retractor.
- Fig. 4 and 4 bis - SYLEC integrated axially in a mechanical reel or pyrotechnic pretensioner and connected by cable to the winding system.
- Fig. 6 and 7 - SYLEC integrated axially in a mechanical reel or pyrotechnic pretensioner and whose piston is connected by a screw to the winding system (internal screw and external screw of the composite fuse).
- Fig. 8 and 9 SYLEC with composite fuse in toroidal portion integrated in a mechanical reel or with pyrotechnic pretensioner (connection by central axis or by external cylinder).
- Fig. 10 - 11 and 12 Geometric shapes of the initiators of destruction with controlled effort of the composite fuses.
- the basic SYLEC independent and placed between the vehicle structure and the belt or one of its pretensioning or blocking equipment (fig. 2) consists mainly of a body (2) fixed to the structure of the vehicle by a fastener (5) and in which a piston (3) slides under the effect of the force applied to the fastener (6) for connection with the belt or one of its equipment.
- the piston (3) crushes the composite fuse (1).
- the composite fuse (1) is placed in a heel (7) holding having a double crown (8) for embedding and interposed between the piston
- the heel (7) bears on the closure (4) of the body, the orifice of which serves as a guide for the piston rod (3).
- the heel (7) can be integrated into the closure support (4) and the shoe (9) can be integrated into the piston (3).
- the SYLEC integrated in a pyrotechnic belt retractor fig.3 consists mainly a body (2) fixed to the structure of the vehicle.
- the piston (3) has a central orifice in which the driving piston (13) of the pyrotechnic retractor slides.
- the belt tensioner gas generator is fixed to the body using the thread (11). Before the operation of this generator, the engine piston is in position (12) and it is equipped with its non-return locking system (14) which is free to move.
- the motor core moves to its position (13), it tightens the belt via the cable (18).
- the seal is ensured by a seal (17).
- the motor core (13) is locked on the piston (3) using its non-return system (15).
- this construction makes the crushing stroke of the fuse (1) independent of the pretensioning stroke of the motor core linked to the relative conditions of tension and length of the belt, at the time of the accident.
- the SYLEC can be integrated into a reel whether or not equipped with a pyrotechnic pretensioner by being placed along the axis of the reel (23) - FIG. 4 and 4 bis.
- the composite fuse (1) is placed between the bearing heel (7) linked to the structure of the vehicle and the shoe (9) of the mobile piston (3) linked to the mobile part in rotation (11).
- the piston (3) comprises a guide cylinder (19) because the connection with the belt retractor is ensured by a cable (18), preferably made of steel or aramid fiber.
- This connecting cable (18) is fixed at (22) to the drum of the belt reel (21).
- the cable (18) passes through two guide eyelets (20) (20bis).
- the SYLEC can be integrated into a reel (23) with or without a pyrotechnic pretensioner, by being placed tangentially to the reel.
- the composite fuse (1) is placed between the bearing heel (7) and the shoe (9).
- the piston (3) comprises a guide cylinder (19) because the connection with a mobile drum of the reel (21) is made using a cable (18) preferably made of steel or aramid. This cable (18) is fixed at (22) to the movable drum
- the SYLEC can be integrated into a reel and placed along the axis of rotation of this reel, the piston being connected to the winding system by a screw.
- the composite fuse (1) is placed between the heel (7) and the shoe (9) which may or may not have a positioning lug (27) which slides in a groove (28) made in the body (2) linked to the part fixed reel; the bottom of the body (2) serving as a support bottom; this prevents rotation of the shoe (9), which would cause a disturbing torque on the fuse (1).
- the crushing piston (3) is equipped with a portion of screws (30) and a lug (29).
- the screw-type axis (24) (30) is linked to the winding system of the rotating mobile belt.
- the force applied by the thorax to the belt creates a torque on the axis of the reel which transmits this torque to the axis (24). This transmits this torque to the piston (3) via the screw connection (30).
- the piston (3) moving axially due to the presence of its lug (29) in the groove (28). It induces an axial force applied to the fuse (1).
- the SYLEC with rotary action is preferably integrated in a belt reel whether or not equipped with a pyrotechnic pretensioner.
- the connection between the SYLEC and the reel is preferably made by the central axis (fig.8) or by an outer ring (fig.9).
- the composite fuse (1) preferably has a toric shape, it is held internally by a metallic axis (33) of the same toric shape.
- the composite fuse (1) is placed between a bearing heel (7) and a shoe (9).
- the piston (3) is linked to the reel (31) by the axis (32).
- the composite fuse (1) is preferably toroidal, but without departing from the invention, it can be cylindrical and be placed along a cord of the reel ( 31).
- the piston (3) is linked to the reel (31) by the crown (34).
- the composite fuse (1) is preferably produced by winding a fabric prepreg of a thermosetting resin such as polyester, vinyl ester, epoxide.
- the fabric is preferably made of fiberglass or carbon fiber.
- the composite fuse is also preferably produced by winding fabric pre-impregnated with thermoplastic resin.
- the composite fuse is also produced by simultaneously winding a dry fabric and a thermoplastic wire, then heated and compressed.
- the composite fuse can be produced by injection of thermosetting resin on woven or braided cylindrical shapes.
- the composite fuse can be produced by shaping, on a cylindrical mandrel, cylindrical woven or braided shapes pre-impregnated with thermosetting resin.
- the composite fuse can be produced by filament winding preferably with glass or carbon wire impregnated or prepreg with thermosetting or thermoplastic resin.
- these composite fuses can be produced by other industrial means.
- the priming end of the composite fuse has been defined to control the destruction priming effort at a determined level, relative to the destruction force along the composite fuse.
- the priming end of the rupture of the composite fuse is preferably placed on the side of the shoe.
- this end preferably has a cylindrical part (35) of thickness el, a conical part (36), and the beginning of the body (37) which is cylindrical of thickness e2, when l 'we want a constant crushing force.
- this end (FIG. 11) preferably has a cylindrical part (35) of thickness el, then a cylindrical part (37) of thickness e2.
- this end preferably has a frustoconical part (36) whose starting thickness is equal to el and a cylindrical part (37) of thickness e2.
- these geometries of the priming end are preferably produced by lapping pre-cut fabric, the geometry of which is flat before winding is adapted to the geometry of priming. After winding, these cuts lead to local under-thicknesses of the end of the rupture initiator.
- the geometry of the priming can be machined.
- the composite fuse (1) can be cylindrical and the initiation of the rupture carried out by a local decrease in the density of fibers in warp or weft or in warp and weft of the fabric to be wound.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR9707437-3A BR9707437A (en) | 1996-02-12 | 1997-02-11 | Force limiting device for energy absorption. |
EP97905189A EP0894058A1 (en) | 1996-02-12 | 1997-02-11 | Energy absorbing force limiter device |
CA 2246436 CA2246436A1 (en) | 1996-02-12 | 1997-02-11 | Energy absorbing force limiter device |
JP9528241A JP2000505758A (en) | 1996-02-12 | 1997-02-11 | Force limiting device by energy absorption |
AU18833/97A AU1883397A (en) | 1996-02-12 | 1997-02-11 | Energy absorbing force limiter device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9601782A FR2744779B1 (en) | 1996-02-12 | 1996-02-12 | ENERGY ABSORPTION COMPOSITE EFFORT LIMITER SYSTEM |
FR96/01782 | 1996-02-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997028994A1 true WO1997028994A1 (en) | 1997-08-14 |
Family
ID=9489162
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1997/000264 WO1997028994A1 (en) | 1996-02-12 | 1997-02-11 | Energy absorbing force limiter device |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0894058A1 (en) |
JP (1) | JP2000505758A (en) |
KR (1) | KR19990082431A (en) |
AU (1) | AU1883397A (en) |
BR (1) | BR9707437A (en) |
FR (1) | FR2744779B1 (en) |
WO (1) | WO1997028994A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10035148B4 (en) * | 2000-07-19 | 2012-12-06 | Volkswagen Ag | Restraint |
DE102017201016A1 (en) * | 2017-01-23 | 2018-07-26 | Volkswagen Aktiengesellschaft | Seat belt device for a vehicle |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2258063A1 (en) * | 1972-11-27 | 1974-06-20 | Opel Adam Ag | HOLLOW COMPONENT, IN PARTICULAR FOR VEHICLES |
DE2517572A1 (en) * | 1974-04-25 | 1975-11-13 | Poudres & Explosifs Ste Nale | WINDING DEVICE, ESPECIALLY FOR TENSIONING SAFETY BELTS |
FR2268993A1 (en) * | 1974-04-23 | 1975-11-21 | Poudres & Explosifs Ste Nale | |
US4170940A (en) * | 1976-09-27 | 1979-10-16 | Societe D'etudes, De Realisations Et D'applications Techniques | Projectile charges |
US4258934A (en) * | 1978-05-23 | 1981-03-31 | Nippon Soken, Inc. | Seat belt tensioning device |
EP0540921A1 (en) * | 1991-11-07 | 1993-05-12 | Trw Repa Gmbh | Belt tensioner for vehicle seat belt systems |
EP0595668A1 (en) * | 1992-10-27 | 1994-05-04 | Atlantic Research Corporation | Two-part igniter for gas generating compositions |
DE4422980A1 (en) * | 1994-06-30 | 1996-01-04 | Hs Tech & Design | Vehicle seat belt tensioner device |
-
1996
- 1996-02-12 FR FR9601782A patent/FR2744779B1/en not_active Expired - Fee Related
-
1997
- 1997-02-11 WO PCT/FR1997/000264 patent/WO1997028994A1/en not_active Application Discontinuation
- 1997-02-11 JP JP9528241A patent/JP2000505758A/en active Pending
- 1997-02-11 BR BR9707437-3A patent/BR9707437A/en not_active Application Discontinuation
- 1997-02-11 EP EP97905189A patent/EP0894058A1/en not_active Withdrawn
- 1997-02-11 KR KR1019980706164A patent/KR19990082431A/en not_active Application Discontinuation
- 1997-02-11 AU AU18833/97A patent/AU1883397A/en not_active Abandoned
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2258063A1 (en) * | 1972-11-27 | 1974-06-20 | Opel Adam Ag | HOLLOW COMPONENT, IN PARTICULAR FOR VEHICLES |
FR2268993A1 (en) * | 1974-04-23 | 1975-11-21 | Poudres & Explosifs Ste Nale | |
DE2517572A1 (en) * | 1974-04-25 | 1975-11-13 | Poudres & Explosifs Ste Nale | WINDING DEVICE, ESPECIALLY FOR TENSIONING SAFETY BELTS |
US4170940A (en) * | 1976-09-27 | 1979-10-16 | Societe D'etudes, De Realisations Et D'applications Techniques | Projectile charges |
US4258934A (en) * | 1978-05-23 | 1981-03-31 | Nippon Soken, Inc. | Seat belt tensioning device |
EP0540921A1 (en) * | 1991-11-07 | 1993-05-12 | Trw Repa Gmbh | Belt tensioner for vehicle seat belt systems |
EP0595668A1 (en) * | 1992-10-27 | 1994-05-04 | Atlantic Research Corporation | Two-part igniter for gas generating compositions |
DE4422980A1 (en) * | 1994-06-30 | 1996-01-04 | Hs Tech & Design | Vehicle seat belt tensioner device |
Also Published As
Publication number | Publication date |
---|---|
FR2744779B1 (en) | 1998-03-27 |
AU1883397A (en) | 1997-08-28 |
EP0894058A1 (en) | 1999-02-03 |
KR19990082431A (en) | 1999-11-25 |
BR9707437A (en) | 2000-01-04 |
JP2000505758A (en) | 2000-05-16 |
FR2744779A1 (en) | 1997-08-14 |
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