CN103068642A - Belt tensioner for a seat belt of a motor vehicle - Google Patents
Belt tensioner for a seat belt of a motor vehicle Download PDFInfo
- Publication number
- CN103068642A CN103068642A CN2011800384970A CN201180038497A CN103068642A CN 103068642 A CN103068642 A CN 103068642A CN 2011800384970 A CN2011800384970 A CN 2011800384970A CN 201180038497 A CN201180038497 A CN 201180038497A CN 103068642 A CN103068642 A CN 103068642A
- Authority
- CN
- China
- Prior art keywords
- piston
- holding element
- pipe
- belt tightener
- actuating device
- 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.)
- Granted
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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
- B60R22/46—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
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- 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
- B60R2022/4642—Reels with means to tension the belt in an emergency by forced winding up characterised by fluid actuators, e.g. pyrotechnic gas generators the gas directly propelling a flexible driving means, e.g. a plurality of successive masses, in a tubular chamber
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automotive Seat Belt Assembly (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Abstract
The invention relates to a belt tensioner for a seat belt of a motor vehicle, comprising: a piston-tube unit with a piston (2) which can be driven pyrotechnically in the tube (1), and a driving means (6) which can be driven by the piston (2) and transmits the driving movement of the piston (2) to a driving wheel (3) in order to tension the seat belt, wherein a retaining element is provided, the retaining element projecting into a section of the tube (1), which section is located upstream of the driving wheel (3) in the direction of movement of the piston (2), and being dimensioned in such a manner that the driving means (6) can pass unobstructed, and the piston (2) is stopped.
Description
The present invention relates to a kind of belt tightener that is used for car belt of feature of the preamble with claim 1.
The task that belt tightener has substantially is: the belt sag that will occur in the early stage moment that accident occurs is from described belt pull, so that be associated to as early as possible car retardation with restrained passenger by this in moving forward subsequently.
A suitable embodiment of belt tightener is: belt tightener has the piston-pipe unit as actuating device, and in piston-pipe unit, described piston can be driven by the pressure of pyrotechnic generator generation by one.For the strained movements with driven piston is delivered on the safety strap, for example, a string mass body that is directed against each other that unclamps is set in pipe, this mass body can pass through piston actuated.In addition, the tape spool of tape wrapping device is connected with drive wheel antitorquely, and this drive wheel has the domed recess suitable with the shape of mass body.Can in pipe, leave this pipe from a certain position of pipe by driven mass body, and by engaging in the recess and along tension direction promotion drive wheel and the tape spool of safety strap, thereby safety strap finally is tensioned.This belt tightener for example can be learnt from DE19512660A1.
If the tape wrapping device is provided with a force limiting device, in the passenger moved forward, when predetermined power limit levels was exceeded, after and then being with tensioning, safety strap was extracted out again.Therefore the direction of extracting out with the safety strap of strained movements and the restriction of the power in the power restriction stage is opposite.
Because temporal sequence and the very fast motion process with described rotation direction counter-rotating, what may occur is, the band of power restriction is extracted out and is disturbed by strained movements in the early time at least in short-term, thereby the power limit levels short time that moves forward that is used for the crack force restriction is higher than the power limit levels designed to force limiting device.This for example may or snap in drive wheel and cause by piston wedging, and thus, it is disturbed that the band of power restriction is drawn back the gyroscopic movement of the required drive wheel of motion and tape spool.
In addition, the strained movements of drive wheel also is stuck because of following: piston is out snapping in the drive wheel in managing afterwards, and hinders the further rotation of drive wheel.The strained movements of drive wheel is blocked suddenly in the case, and tensioning power has unnecessarily reduced thus.
The target of the present invention thus belt tightener of the feature by having claim 1 realizes.The embodiment of present invention further optimization provides by dependent claims and accompanying drawing and description thereof.
According to basic conception of the present invention, propose: holding element is set, this holding element stretches into the part that is arranged in the drive wheel upstream on the sense of motion of piston in the described pipe, and the size of this holding element is provided so that: actuating device can be unhinderedly by being blocked with piston.The holding element that passes through to propose, piston initiatively stopped, and stop piston to move further into drive wheel and be stuck in wherein in this.Therefore the present invention utilizes following situation: piston has substantially different tasks with actuating device, and therefore has different size.The task that piston has is, the pressure chamber in the sealed tube and the overall diameter that therefore has approximate internal diameter corresponding to pipe.Described actuating device only is against on the piston, and the shape of this actuating device be designed to so that: this actuating device is passed to drive wheel by engaging into drive wheel with strained movements.The shape of actuating device therefore and drive wheel be complementary, wherein for minimum frictional losses, the size of actuating device specially is designed to, so that by being bearing on the described inwall, and the as far as possible little friction of generation.Therefore actuating device has the outside dimension that substantially is different from piston.Because the different size of piston and actuating device, the size of holding element can be designed as, actuating device unhinderedly passes through, and piston is booked.
To explain in detail the present invention according to a plurality of embodiment subsequently.Wherein:.
Fig. 1 illustrates the belt tightener of the holding element of the form with ring;
Fig. 2 illustrates the belt tightener of the holding element of latch (Blockierzahn) form that has in the outlet of stretching into pipe;
Fig. 3 illustrates the belt tightener of the holding element of the elastic element form that has in the outlet of stretching into pipe.
Fig. 1 illustrates belt tightener constructed according to the invention, and this belt tightener comprises piston-pipe unit, and this piston-pipe unit has pipe 1 and piston 2, and this piston can be interior driven at described pipe 1 by pyrotechnic.This piston 2 is to be close to hermetically on pipe 1 the inwall and the pressure chamber in the closure tube, and this pressure chamber can be by the pyrotechnic generator (not shown) and the impact that is under pressure.In addition, the drive wheel 3 with internal tooth section 5 is shown also among the figure, this drive wheel can be connected to the tape spool that is not illustrated of Webbing retractor antitorquely, and seat belt winding is on described tape spool.Finally be delivered on the safety strap for the strained movements with piston 2 is delivered on the drive wheel 3 or reaches on the tape spool, be provided with actuating device 6, this actuating device has the form of a string mass body against each other that unclamps, described mass body is directed in pipe 1, and in order to transmit strained movements, described mass body after leaving described pipe 1 can with the overall diameter that is arranged on drive wheel 3 on 4 engagements of domed recess.For minimum surface pressure, so described domed recess 4 adapts to the shape of mass body.In the embodiment of giving, mass body is that sphere and recess 4 correspondingly are the essentially identical spherical crown with shape of part ball of radius.Just in this point, belt tightener is corresponding to belt tightener known among the DE19512660A1, and therefore this known belt tightener is added in the application's the disclosure clearly.
On described pipe 1, the part that the sense of motion in piston 2 in described pipe 1 is arranged in drive wheel 3 upstreams is provided with holding element, and this holding element is two arms are engaged in the clip 7 in pipe 1 the respective recess in both sides form.Clip 7 is guaranteed to remain on the wall of pipe 1 by described arm in the both sides engagement, and wherein, described arm can be constructed to have elasticity, so that described arm in confined state, applies elastic biasing at the wall of managing 1.The size of described arm is provided so that described arm has a distance to each other in confined state, and this distance can unhinderedly be passed through mass body.At this moment, piston 2 has the overall diameter that interior diameter larger and pipe 1 adapts, and piston 2 is stopped face to face by clip, and can not enter in the drive wheel 3 therefrom on being bearing in clip 7 time.Because the spherical end surface of mass body and holding element are suitable in this case, holding element is expanded, and has wherein utilized the elastic behavior of holding element, and mass body can unhinderedly pass through.Described piston 2 has substantially different profiles in contrast---because described piston is not to be set to engage in the domed recess 4 of drive wheel 3---and therefore the end face that correspondingly is shaped of described piston keeps being hung on the holding element wittingly.
By piston 2 being blocked in before the drive wheel 3, can avoid piston 2 to block drive wheel 3 because engaging into spherical recess 4, thereby make mass body strained movements can be passed to drive wheel 3 fully on the one hand, and on the other hand, the band of---this force limiting device for example has the form that is arranged at the torsion bar in the tape spool---power restriction after being right after strained movements is extracted out in the motion if be provided with force limiting device, and the gyroscopic movement of drive wheel 3 is not disturbed.
In Fig. 2, another embodiment of the present invention is shown, wherein, holding element is made of the braking moulding 8 of being fixed on the belt tightener in the outlet 11 of stretching into pipe 1.
In Fig. 3, another embodiment of the invention is shown, wherein, holding element consists of by elastic element 9, and these elastic element 9 free ends stretch in the outlet 11 of pipe 1.Described elastic element 9 can be fabricated to blanked part with arbitrary shape at low cost by metal sheet.
Can find out the advantage of Fig. 2 and 3: can need not for the structure of holding element and process extraly so that manage 1.
In all three embodiments, the different shaping of piston 2 and actuating device 6 also is used to, and makes holding element just stop respectively the motion of piston 2.This is for example by with the realization of getting off: actuating device 6 has substantially the overall diameter less than piston 2, actuating device 6 is expressed into outside the holding element by taper or spherical end face, and piston 2 keep being hung on the holding element by corresponding less end face taper or spherical.
Claims (9)
1. belt tightener that is used for car belt, it comprises:
Piston-pipe unit, it has piston (2), and this piston can be driven in described pipe (1) by pyrotechnic;
Actuating device (6), it can be driven by piston (2) and the actuation movement of piston (2) is passed to drive wheel (3), is used for the tensioning safety strap;
It is characterized in that:
Be provided with holding element, this holding element stretches into the part that is arranged in drive wheel (3) upstream on the sense of motion of piston (2) in the described pipe (1), and the size of this holding element is provided so that: actuating device (6) can be unhinderedly by being blocked with piston.
2. belt tightener according to claim 1 is characterized in that, holding element is maintained on the wall of pipe (1) in the mode of self-locking.
3. belt tightener according to claim 2 is characterized in that, holding element passes through at least clip (7) formation of supported on both sides on the wall of pipe (1).
4. according to claim 2 or 3 described belt tighteners, it is characterized in that holding element remains on the pipe (1) by one or more areal of supports antitorquely.
5. according to the described belt tightener of aforementioned arbitrary claim, it is characterized in that holding element is formed by elastic element (9).
6. according to the described belt tightener of aforementioned arbitrary claim, it is characterized in that holding element stretches in the outlet towards drive wheel (3) (11) of pipe (1).
7. actuating device (6) according to the described belt tightener of aforementioned arbitrary claim, it is characterized in that actuating device (6) comprises end face cylindrical-conical or that have the shape of at least part of ball, so that can pass through pipe (1) by extruding holding element.
8. belt tightener according to claim 7 is characterized in that, actuating device (6) is formed by a string mass body against each other that unclamps, and described mass body is spherical.
9. according to the described belt tightener of aforementioned arbitrary claim, it is characterized in that piston (2) comprises an end face, the end face of this piston is formed so that piston (2) is blocked on holding element by this end surface supporting.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102010034622.5 | 2010-08-17 | ||
| DE201010034622 DE102010034622B4 (en) | 2010-08-17 | 2010-08-17 | Belt tensioner for a safety belt of a motor vehicle |
| PCT/EP2011/003703 WO2012022419A1 (en) | 2010-08-17 | 2011-07-23 | Belt tensioner for a seat belt of a motor vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103068642A true CN103068642A (en) | 2013-04-24 |
| CN103068642B CN103068642B (en) | 2015-11-25 |
Family
ID=44544022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180038497.0A Active CN103068642B (en) | 2010-08-17 | 2011-07-23 | A kind of belt tightener for car belt |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN103068642B (en) |
| DE (1) | DE102010034622B4 (en) |
| WO (1) | WO2012022419A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107571835A (en) * | 2016-07-05 | 2018-01-12 | 奥托立夫开发公司 | The coiler of the belt with pre-load device of drive and the use drive |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014006499B4 (en) * | 2014-05-06 | 2019-01-10 | Trw Automotive Gmbh | Belt tensioner and method for assembling a belt tensioner |
| EP3501914B1 (en) * | 2017-12-21 | 2021-01-27 | SFS Intec Holding AG | Belt roller with drive element |
| DE102020206348A1 (en) | 2020-05-20 | 2021-11-25 | Joyson Safety Systems Germany Gmbh | BELT ROLLER WITH TENSIONER DRIVE |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5690295A (en) * | 1995-08-02 | 1997-11-25 | Autoliv Development Ab | Mass body drive for a rotational tensioning device |
| US5765774A (en) * | 1996-04-05 | 1998-06-16 | Takata Corporation | Seat belt retractor employing ultrasonic motor |
| CN1074368C (en) * | 1994-04-11 | 2001-11-07 | 奥托里夫发展有限公司 | Mass-body drive for a rotary tightening device |
| CN1371331A (en) * | 1999-06-28 | 2002-09-25 | 奥托里夫发展有限公司 | Rotation tensioner with inerita element |
| WO2005080150A1 (en) * | 2004-02-17 | 2005-09-01 | Autoliv Development Ab | Rotary tightener comprising a drive stop |
| CN1902068A (en) * | 2003-09-16 | 2007-01-24 | 奥特立夫Ifb印度有限公司 | A web spool tightener |
| CN101070061A (en) * | 2006-05-10 | 2007-11-14 | 高田株式会社 | Seat belt retractor |
| WO2009123318A1 (en) * | 2008-03-31 | 2009-10-08 | Ashimori Industry Co., Ltd. | Seatbelt retractor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3034258C2 (en) * | 1980-09-11 | 1985-11-14 | TRW Repa GmbH, 7071 Alfdorf | Drive device |
| DE19512660C2 (en) * | 1994-04-11 | 1999-11-18 | Autoliv Dev | Pyrotechnic rotary tensioner with mass body drive |
-
2010
- 2010-08-17 DE DE201010034622 patent/DE102010034622B4/en active Active
-
2011
- 2011-07-23 WO PCT/EP2011/003703 patent/WO2012022419A1/en active Application Filing
- 2011-07-23 CN CN201180038497.0A patent/CN103068642B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1074368C (en) * | 1994-04-11 | 2001-11-07 | 奥托里夫发展有限公司 | Mass-body drive for a rotary tightening device |
| US5690295A (en) * | 1995-08-02 | 1997-11-25 | Autoliv Development Ab | Mass body drive for a rotational tensioning device |
| US5765774A (en) * | 1996-04-05 | 1998-06-16 | Takata Corporation | Seat belt retractor employing ultrasonic motor |
| CN1371331A (en) * | 1999-06-28 | 2002-09-25 | 奥托里夫发展有限公司 | Rotation tensioner with inerita element |
| CN1902068A (en) * | 2003-09-16 | 2007-01-24 | 奥特立夫Ifb印度有限公司 | A web spool tightener |
| WO2005080150A1 (en) * | 2004-02-17 | 2005-09-01 | Autoliv Development Ab | Rotary tightener comprising a drive stop |
| CN101070061A (en) * | 2006-05-10 | 2007-11-14 | 高田株式会社 | Seat belt retractor |
| WO2009123318A1 (en) * | 2008-03-31 | 2009-10-08 | Ashimori Industry Co., Ltd. | Seatbelt retractor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107571835A (en) * | 2016-07-05 | 2018-01-12 | 奥托立夫开发公司 | The coiler of the belt with pre-load device of drive and the use drive |
| CN107571835B (en) * | 2016-07-05 | 2020-05-15 | 奥托立夫开发公司 | Transmission wheel and pre-tightening type safety belt retractor using same |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102010034622A1 (en) | 2012-02-23 |
| CN103068642B (en) | 2015-11-25 |
| WO2012022419A1 (en) | 2012-02-23 |
| DE102010034622B4 (en) | 2015-05-13 |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |