CN206141499U - Pretightening device of safety belt - Google Patents

Abstract

The utility model is suitable for a safety belt field provides a pretightening device of safety belt, including belt buckle, rope, gas generator, cylinder pipe, guide bracket, from locking -type piston and seal cover, the front end of cylinder pipe has the fender ring that is used for the backstop seal cover, and the rear end of seal cover is offered the rear end that makes this seal cover and is out forked ring channel, and two free ends of the jag form rear end of seal cover are respectively to holding cylinder guide pipe inner wall and rope. Rear end through with the seal cover sets up the ring channel, the rear end that makes the seal cover is the jag form, install the front end at the cylinder pipe when the seal cover, two free ends of the jag form rear end of seal cover support respectively holds cylinder guide pipe inner wall and rope, and set up the fender ring at the front end of cylinder pipe, when the gas of gas generator production gets into the cylinder pipe, under the gaseous promotion, can make the jag form rear end of seal cover open, it is sealed with better realization, even if the seal cover is not hard up, also can avoid appearing sealed not tight problem.

Description

Seat belt pretensioners

Technical field

This utility model belongs to seat belt field, more particularly to a kind of seat belt pretensioners.

Background technology

Car belt is a kind of protection device of protection driver and crew safety, when automobile occurs the moment of accident collision, Driver and passenger are leaned forward due to inertia, despite the protective effect of seat belt, because seat belt leaves active strokes, Collision is jolted middle necessarily by the injury threat of multiple directions.And the effect of seat belt pretensioners is occurred surprisingly in automobile The moment of collision, it can first tense seat belt when occupant not yet moves forward, and immediately tightly tie up occupant on the seat, so Afterwards locking seat belt prevents occupant from leaning forward, the safety of effective protection occupant.Current belt pre-tightening apparatus generally comprise use The rope that is connected with bracelet in the bracelet, one end that are connected with seat belt, gas generator, cylinder conduit, for supporting cylinder to lead Pipe simultaneously carries out the guiding trestle of break-in to rope, coordinates the self-locking piston being installed in cylinder conduit, the other end Jing of rope Guide becomes backward, is connected with the self-locking piston in cylinder conduit, and cylinder conduit installs sealing near one end of guide Set, the gas outlet of gas generator is located between sealing shroud and self-locking piston.Gas generator detonation, gas is led into cylinder Pipe, promotes self-locking piston to move in cylinder conduit, to tense rope；When air-inflated pressure is not enough to overcome suffered by rope Pulling force when, self-locking piston is locked in cylinder conduit, prevents rope to be pulled.

The front end of the cylinder conduit of current belt pre-tightening apparatus arranges taper necking, and the profile of corresponding sealing shroud is in cone Shape, when sealing shroud is arranged in cylinder conduit, with taper necking cone seal is formed；It is close but this structure is in vibration Easily loosen between big envelope and taper necking, cause poorly sealed.

Utility model content

The purpose of this utility model is to provide a kind of seat belt pretensioners, it is intended to solve existing seat belt pretensioners Sealing shroud easily loosen, cause poorly sealed problem.

This utility model is achieved in that a kind of seat belt pretensioners, including for be connected with seat belt bracelet, Rope, gas generator, cylinder conduit, for support the cylinder conduit and the rope is carried out break-in guiding trestle, Self-locking piston and be installed on sealing shroud in the front end of the cylinder conduit, the rope that cooperation is installed in the cylinder conduit One end of rope is connected with the bracelet, and guiding trestle described in the other end Jing of the rope becomes back into through the sealing shroud It is connected with the self-locking piston；The gas generator is fixed on the cylinder conduit, and the gas generator goes out QI KOU is located between the sealing shroud and the self-locking piston, and the front end of the cylinder conduit has for sealing described in backstop The baffle ring of set, the rear end of the sealing shroud offers makes cannelure of the rear end of the sealing shroud in jag shape, the sealing shroud Two free ends of jag shape rear end support respectively the cylinder conduit inwall and the rope.

Further, the sealing shroud is in Y types, X-type, U-shaped or V-type along the cross section of the sealing shroud axial direction.

Further, the blocking for the sealing shroud to be plugged in the front end of the cylinder conduit is also included, it is described stifled The first through hole passed through for the rope is offered in plug, the front end of the cylinder conduit is fixed in the blocking, and described stifled Plug is located at side of the sealing shroud away from the baffle ring.

Further, the blocking is provided with external screw thread, and the front end of the cylinder conduit is correspondingly provided with and the external screw thread The female thread of cooperation.

Further, the front end of the cylinder conduit is provided with sleeve pipe, and the gas generator is installed in described sleeve pipe.

Further, the guiding trestle is included for guiding the guide wheel of the rope break-in, connecting the guide wheel With the connecting rod of the cylinder conduit and it is respectively arranged at the backplate of the guide wheel both sides.

Further, corresponding position offers and stretches into fix two backplates for outside grab on each backplate Bayonet socket.

Further, the card convex for being respectively provided on two sides with the corresponding backplate of connection of the guide wheel, on each backplate Correspondence offers the hole clipping snapped in for the card convex.

Further, it is bent with for protecting the rope towards another backplate direction on backplate described at least one Guard, there is the passage passed through for the rope between the guard and the guide wheel.

Further, the self-locking piston includes the piston being slidably mounted in the cylinder conduit, the piston Front end offers the first endless groove, and the rear end of the piston offers the second endless groove, and first endless groove is near described The side wall of two endless groove sides is in conical surface-shaped, some steel balls is equipped with first endless groove, in first endless groove Cushion is also equipped with, the cushion is located at side of each steel ball away from second endless groove, second ring-type Sealing ring is set with groove.

This utility model arranges cannelure by the rear end by sealing shroud, makes the rear end of sealing shroud in jag shape, works as sealing Set supports respectively cylinder conduit inwall and rope installed in the front end of cylinder conduit, two free ends of the jag shape rear end of sealing shroud Rope, and baffle ring is set in the front end of cylinder conduit, when the gas that gas generator is produced enters cylinder conduit, the promotion of gas Under, the jag shape rear end that can make sealing shroud is opened, and realizes sealing with more preferable, even if sealing shroud loosens, is also avoided that appearance Poorly sealed problem.

Description of the drawings

Fig. 1 is a kind of broken section structural representation of seat belt pretensioners that this utility model embodiment one is provided；

Fig. 2 is the decomposed structural representation of the seat belt pretensioners of Fig. 1；

Fig. 3 be Fig. 1 seat belt pretensioners in sealing shroud cross section structure diagram；

Fig. 4 be Fig. 1 seat belt pretensioners in block mplifying structure schematic diagram；

Fig. 5 be Fig. 1 seat belt pretensioners in self-locking piston enlarged diagram；

Fig. 6 be Fig. 1 seat belt pretensioners in tail end locating part dimensional structure diagram.

Fig. 7 is that the sectional structure of sealing shroud in a kind of seat belt pretensioners that this utility model embodiment two is provided is illustrated Figure.

Specific embodiment

In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and enforcement Example, is further elaborated to this utility model.It should be appreciated that specific embodiment described herein is only to explain This utility model, is not used to limit this utility model.

Describe for convenience, defined in this utility model：Cylinder conduit and each part in cylinder conduit, it is close One end of guiding trestle is front end, and its other end is rear end.

Embodiment one：

Refer to Fig. 1 to Fig. 6, a kind of seat belt pretensioners 100, including bracelet 11, rope 12, gas generator 15, Cylinder conduit 60, guiding trestle 20, self-locking piston 50 and sealing shroud 41.Bracelet 11 is used to be connected with seat belt, rope 12 One end is connected with bracelet 11, and the other end Jing guiding trestles 20 of rope 12 become back into through sealing shroud 41 and self-locking piston 50 are connected.The cooperation of self-locking piston 50 is installed in cylinder conduit 60, and self-locking piston 50 can be in cylinder conduit 60 Slide.Guiding trestle 20 is connected with cylinder conduit 60, for supporting cylinder conduit 60, while rope 12 carries out break-in guiding.It is close Big envelope 41 is installed on the front end of cylinder conduit 60, prevents the gas that gas generator 15 is produced from letting out from the front end of cylinder conduit 60 Go out, and then preferably promote self-locking piston 50 to slide in cylinder conduit 60.Gas generator 15 is fixed on cylinder conduit 60 On, and the gas outlet of gas generator 15, positioned between sealing shroud 41 and self-locking piston 50, gas generator 15 is used for detonation Produce, gas enters cylinder conduit 60, promote self-locking piston 50 to move in cylinder conduit 60, to tense rope 12.Cylinder The front end of conduit 60 has baffle ring 621, when sealing shroud 41 is arranged on the front end of cylinder conduit 60, during gas push sealing shroud 41, Baffle ring 621 can prevent sealing shroud 41 from skidding off from the front end of cylinder conduit 60 with baffle seal set 41.The rear end of sealing shroud 41 opens up There is cannelure 411, the cannelure 411 is located at the medium position of the thickness direction of sealing shroud 41, so that the rear end of sealing shroud 41 is in Jag shape.Two free ends of the jag shape rear end of sealing shroud 41 support respectively the inwall of cylinder conduit 60 and rope 12, close to realize Envelope.The structure, because the rear end of sealing shroud 41 is in jag shape, two free end supports respectively the inwall and rope of cylinder conduit 60 Rope 12, even if sealing shroud 41 loosens, can also realize good sealing effectiveness.

Cannelure 411 is arranged by the rear end by sealing shroud 41, the rear end of sealing shroud 41 is made in jag shape, when sealing shroud 41 Installed in the front end of cylinder conduit 60, two free ends of the jag shape rear end of sealing shroud 41 support respectively the inwall of cylinder conduit 60 and Rope 12, and baffle ring 621 is set in the front end of cylinder conduit 60, when the gas that gas generator 15 is produced enters cylinder conduit 60 When, under the promotion of gas, the jag shape rear end that can make sealing shroud 41 is opened, and realizes sealing with more preferable, even if sealing shroud 41 Loosen, be also avoided that poorly sealed problem occur.

Specifically, rope 12 is wirerope, so that rope 12 has larger intensity.

Fig. 1 and Fig. 2 is referred to, the seat belt pretensioners 100 also include adapter sleeve 13, adapter sleeve 13 is used for rope 12 It is connected with bracelet 11.Adapter sleeve 13 is set, can be facilitated and rope 12 is connected with bracelet 11, while can be risen by adapter sleeve 13 To the effect of protection rope 12 end part.

Fig. 2 and Fig. 3 is referred to, in the present embodiment, sealing shroud 41 is in Y types along the cross section of the axial direction of sealing shroud 41.Will be close It is in Y types that the cross section of big envelope 41 is arranged, and only needs to open up cannelure 411 in the rear end of sealing shroud 41 when making, and makes sealing shroud 41 Rear end be in jag shape, while and can ensure that the front end of sealing shroud 41 has larger intensity so that sealing shroud 41 has While good sealing effectiveness, there can be longer service life.

Further, the seat belt pretensioners 100 also include blocking 42, and blocking 42 is fixed on before cylinder conduit 60 End, and 42 are blocked positioned at sealing shroud 41 away from the side of baffle ring 621,42 are blocked for sealing shroud 41 to be plugged in into cylinder conduit 60 Front end.The first through hole 421 passed through for rope 12 is offered in blocking 42, so that rope 12 can pass through first through hole 421 It is connected with self-locking piston 50.Blocking 42 is set, with preferably by the location and installation of sealing shroud 41 in the front end of cylinder conduit 60.Separately Outward, blocking 42 is set, sealing shroud 41 can be placed restrictions on and moved towards the direction of self-locking piston 50, while preventing sealing shroud 41 direct By high-temperature gas calcination.

Further, female thread (not marking in figure) is provided with the front end of cylinder conduit 60, blocking 42 is provided with and interior spiral shell The external screw thread 422 that stricture of vagina coordinates.Female thread is set, and external screw thread 422 is set in blocking 42, blocking 42 is arranged on into gas to facilitate The front end of conduit pipe 60.Further, blocking 42 can support self-locking piston 50 away from one end of external screw thread 422, with convenient Blocking 42 and self-locking piston 50 are installed.

Further, block in the middle part of 42 rear ends and be provided with inner polygon hole 423, so as to be inserted using spanner etc instrument Enter in the inner polygon hole 423, to screw the blocking 42.

Further, the front end of cylinder conduit 60 is provided with sleeve pipe 63, and gas generator 15 is installed in sleeve pipe 63.Set is set Pipe 63, installs fixed gas generator 15, while playing protective gas generator 15 to facilitate.Further, the court of sleeve pipe 63 Rear end to cylinder conduit 60 is obliquely installed.To reduce the interference to seat upper portion part.

Fig. 1 and Fig. 2 is referred to, further, guiding trestle 20 includes guide wheel 21, connecting rod 23 and two pieces of backplates 22, Guide wheel 21 is used to guide the break-in of rope 12, the connection guide wheel 21 of connecting rod 23 and cylinder conduit 60, and guide wheel 21 is supported On cylinder conduit 60, when rope 12 is through guide wheel 21, guide wheel 21 supports rope 12, so that the break-in of rope 12.Two Backplate 22 is respectively arranged at the both sides of guide wheel 21, to play a part of to protect rope 12.

Further, corresponding position offers and stretches into fix the card of two backplates 22 for outside grab on each backplate 22 Mouth 222.Bayonet socket 222 is respectively provided with each backplate 22, when two pieces of backplates 22 are clamped in the both sides of guide wheel 21, two backplates The position of bayonet socket 222 on 22 is identical, then can be stretched in two bayonet sockets 222 using outside grab, and two backplates 22 are fixed, And then fix the guiding trestle 20 and cylinder conduit 60.Two backplates 22 are passed through when a flange panel beating is arranged in seat base On bayonet socket 222, then two pieces of backplates 22 can be fixed, and then can place restrictions on this seat belt pretensioners 100 rotating.

Further, guide wheel 21 is respectively provided on two sides with the card convex 211 for connecting corresponding backplate 22, correspondence on each backplate 22 Offer the hole clipping 221 snapped in for card convex 211.Card convex 211 is set in the both sides of guide wheel 21, and card is set on each backplate 22 Hole 221, it is easy for installation to facilitate the side that backplate 22 is arranged on guide wheel 21.

Further, the bib for protecting rope 12 is bent with least one backplate 22 towards the direction of another backplate 22 Plate 223, has the passage (not marking in figure) passed through for rope 12 between guard 223 and guide wheel 21.Guard 223 is set, When passage of the rope 12 between guard 223 and guide wheel 21 passes through, can play a part of to protect rope 12.In other realities In applying example, guard 223 can be set on two backplates 22, guard 223 is made from corresponding backplate 22 to two backplates 22 Middle part bending formed.

Further, fluting 224 is offered on guard 223, corresponding another backplate 22 is provided with cooperation insertion should Location-plate 225 in fluting 224.Fluting 224 is set on guard 223, and location-plate 225 is set on another backplate 22, During so as to the both sides that two backplates 22 are arranged on guide wheel 21, location-plate 225 can be inserted the fluting 224 of guard 223 In, such that it is able to two pieces of backplates 22 are positioned.

Further, in the present embodiment, cylinder conduit 60 includes cylinder block 62 and guiding tube 61, and cylinder block 62 is arranged on draws The front end of conduit 61, guiding tube 61 is arranged on the rear end of cylinder block 62.The structure can facilitate sealing shroud 41 and self-locking piston 50 installation, such as sealing shroud 41 can be arranged on the front end of cylinder block 62 from the rear end of cylinder block 62, and above-mentioned baffle ring 621 sets Put in the front end of cylinder block 62.And self-locking piston 50 can be slidably mounted in guiding tube 61 from the front end of guiding tube 61.Enter One step ground, when blocking 42 is arranged, blocking 42 can be arranged in cylinder block 62 from the rear end of cylinder block 62.

Further, guide wheel 21, connecting rod 23 and cylinder block 62 can be integrally formed.The structure processing and fabricating letter Single, convenience, while can ensure that guide wheel 21, connecting rod 23 have higher bonding strength with cylinder block 62.Certainly, sleeve pipe 63 It is integrally formed with cylinder block 62.To increase the bonding strength of sleeve pipe 63 and cylinder block 62.

Fig. 1, Fig. 5 and Fig. 6 are referred to, further, in the present embodiment, self-locking piston 50 includes piston 51, Ruo Gangang Pearl 53 and sealing ring 52.Piston 51 is slidably mounted in cylinder conduit 60, so that gas can promote piston 51 in cylinder conduit Slide in 60.The front end of piston 51 offers the first endless groove 512, and the rear end of piston 51 offers the second endless groove 511, and first Side wall 513 of the endless groove 512 near the side of the second endless groove 511 is in conical surface-shaped, and some steel balls 53 are arranged on the first endless groove In 512, and some steel balls 53 are arranged in a ring in the first endless groove 512, to carry out rolling slip.52 sets of sealing ring In being mounted in the second endless groove 511, to play sealing function.The structure, when the blast of gas generator 15 produces gas, gas enters Enter cylinder conduit 60, promote piston 51 to slide to the rear end of cylinder conduit 60, to tense rope 12, and then tense seat belt；When To pull during seat belt, piston 51 can be moved the insufficient pressure of gas to the front end of cylinder conduit 60, due to the first endless groove 512 Side wall 513 near the side of the second endless groove 511 is in conical surface-shaped, and each steel ball 53 in the first endless groove 512 can be in inertia Under direction from effect to taper seat move, then now can each steel ball 53 of jack-up, make steel ball 53 support the inwall of cylinder conduit 60, prevent Only piston 51 is moved, and realizes auto-lock function.

Further, the self-locking piston 50 also includes cushion 54, and cushion 54 is sleeved in the first endless groove 512, And cushion 54 is located at side of each steel ball 53 away from the second endless groove 511.Cushion 54 is installed in the first endless groove 512, And make cushion 54 be located at side of each steel ball 53 away from the second endless groove 511, move to the rear end of cylinder conduit 60 in piston 51 When dynamic, cushion 54 can play a part of buffering, preferably to promote steel ball 53 to move, play a part of to protect steel ball 53. Certainly in some other embodiment, it is also possible to be not provided with cushion 54.Specifically, sealing ring 52 can be O-ring, to reduce Cost.

Further, the seat belt pretensioners 100 also include tail end locating part 43, and tail end locating part 43 is remote with rope 12 One end from bracelet 11 is fixedly linked.The perforation 514 passed through for rope 12 is offered in self-locking piston 50, rope 12 can be worn Cross the perforation 514 to be fixedly linked with tail end locating part 43.Tail end locating part 43 is set, is connected with rope 12 with facilitating, and then will Rope 12 is fixedly linked with self-locking piston 50.It is possible to further by tail end locating part 43 and the fixing phase of self-locking piston 50 Even.

Specifically, above-mentioned perforation 514 is opened in piston 51, and is threaded hole in the rear end of piston 51 (in figure not Mark), and stud 431 is set on tail end locating part 43, tail end locating part 43 is fixedly linked with piston 51 with facilitating.When So, in some other embodiment, it is also possible to taper hole is set in the rear end of piston 51, and is coordinated in the front end of tail end locating part 43 It is convex that cone is set, because tail end locating part 43 is connected with rope 12, when boring in convex insertion taper hole, in rope 12 and cylinder conduit 60 Air pressure can promote piston 51, so as to tail end locating part 43 be fixedly linked with piston 51, while playing a part of to be automatically positioned.

Further, limiting stand 432 is also convexly equipped with tail end locating part 43, stud 431 is located at limiting stand 432 near piston 51 side.Limiting stand 432 is set on tail end locating part 43, tail end locating part 43 can be limited with the rear end face of backstop piston 51 The stroke being installed in the perforation 514 of piston 51.

Embodiment two：

Refer to Fig. 7, the seat belt pretensioners of the present embodiment and being distinguished as the seat belt pretensioners of embodiment one：

Fig. 1 is seen also, in the present embodiment, sealing shroud 41b is in X-type along the cross section of sealing shroud 41b axial directions.The knot Structure can not differentiate between front end and rear end when sealing shroud 41b to be arranged on the front end of cylinder conduit 60, easy for installation.In other realities In applying example, sealing shroud 41b can also the shape such as U-shaped or V-type along the cross section of sealing shroud 41b axial directions.

Other knots of the other structures of the seat belt pretensioners of the present embodiment and the seat belt pretensioners of embodiment one Structure is identical, is repeating no more.

Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit this utility model Any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in this utility model Protection domain within.

Claims (10)

1. a kind of seat belt pretensioners, including for be connected with seat belt bracelet, rope, gas generator, cylinder conduit, It is installed in the cylinder conduit for supporting the cylinder conduit and the guiding trestle of break-in, cooperation being carried out to the rope Self-locking piston and sealing shroud in the front end of the cylinder conduit is installed on, one end of the rope is connected with the bracelet, institute State described in the other end Jing of rope guiding trestle to become back into being connected with the self-locking piston through the sealing shroud；It is described Gas generator is fixed on the cylinder conduit, and the gas outlet of the gas generator be located at the sealing shroud with it is described from Between locking-type piston, it is characterised in that the front end of the cylinder conduit has the baffle ring for sealing shroud described in backstop, described close The rear end of big envelope offers makes the cannelure of the rear end of the sealing shroud in jag shape, the jag shape rear end of the sealing shroud two from Support respectively the cylinder conduit inwall and the rope by holding.

2. seat belt pretensioners as claimed in claim 1, it is characterised in that horizontal stroke of the sealing shroud along sealing shroud axial direction Section is in Y types, X-type, U-shaped or V-type.

3. seat belt pretensioners as claimed in claim 1 or 2, it is characterised in that also include for by the sealing sleeve Block up and the first through hole passed through for the rope is offered in the blocking of the front end of the cylinder conduit, the blocking, it is described stifled Plug is fixed on the front end of the cylinder conduit, and the blocking is located at side of the sealing shroud away from the baffle ring.

4. seat belt pretensioners as claimed in claim 3, it is characterised in that the blocking is provided with external screw thread, the gas The front end of conduit pipe is correspondingly provided with the female thread coordinated with the external screw thread.

5. seat belt pretensioners as claimed in claim 1 or 2, it is characterised in that the front end of the cylinder conduit is provided with set Pipe, the gas generator is installed in described sleeve pipe.

6. seat belt pretensioners as claimed in claim 1 or 2, it is characterised in that the guiding trestle is included for guiding The guide wheel of the rope break-in, the connecting rod for connecting the guide wheel and the cylinder conduit and it is respectively arranged at the guiding The backplate of wheel both sides.

7. seat belt pretensioners as claimed in claim 6, it is characterised in that corresponding position offers on each backplate Stretch into fix the bayonet socket of two backplates for outside grab.

8. seat belt pretensioners as claimed in claim 6, it is characterised in that the guide wheel is respectively provided on two sides with connection The card convex of the corresponding backplate, correspondence offers the hole clipping snapped in for the card convex on each backplate.

9. seat belt pretensioners as claimed in claim 6, it is characterised in that towards another institute on backplate described at least one State backplate direction and be bent with guard for protecting the rope, have between the guard and the guide wheel and supply the rope The passage that rope passes through.

10. seat belt pretensioners as claimed in claim 1 or 2, it is characterised in that the self-locking piston includes peace of sliding Loaded on the piston in the cylinder conduit, the front end of the piston offers the first endless groove, and the rear end of the piston offers Second endless groove, first endless groove near the second endless groove side side wall be in conical surface-shaped, first ring-type Some steel balls are equipped with groove, cushion is also equipped with first endless groove, it is remote that the cushion is located at each steel ball From the side of second endless groove, in second endless groove sealing ring is set with.