CN111989244A - Tensioner assembly for a belt tensioner and method of manufacturing a tensioner assembly - Google Patents
Tensioner assembly for a belt tensioner and method of manufacturing a tensioner assembly Download PDFInfo
- Publication number
- CN111989244A CN111989244A CN201980026516.4A CN201980026516A CN111989244A CN 111989244 A CN111989244 A CN 111989244A CN 201980026516 A CN201980026516 A CN 201980026516A CN 111989244 A CN111989244 A CN 111989244A
- Authority
- CN
- China
- Prior art keywords
- gas generator
- ignition unit
- tension tube
- micro gas
- tensioner assembly
- 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.)
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Classifications
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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
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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
- B60R22/18—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
- B60R2021/26029—Ignitors
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automotive Seat Belt Assembly (AREA)
- Air Bags (AREA)
Abstract
The application provides a tensioner assembly (10) for a belt tensioner, the tensioner assembly comprising a tension tube (12) and a micro gas generator (14) arranged at least partially in the tension tube (12), the micro gas generator having a holder (16), an ignition unit (18) and a deflagration charge container (20), the deflagration charge container being filled with deflagration charge (22), wherein the tension tube (12) has a support (30) against which the micro gas generator (14) rests, wherein the tension tube (12) has a radially inwardly crimped section (32) by which the micro gas generator (14) is held in the tension tube (12), and wherein the micro gas generator (14) is waisted, wherein the crimped section (32) of the tension tube (12) is arranged in a waisted region of the micro gas generator (14). Further, a method for manufacturing a tensioner assembly is also presented.
Description
Technical Field
The present invention relates to a tensioner assembly for a belt tensioner and a method for manufacturing a tensioner assembly.
Background
Belt tensioners are known in which a miniature gas generator mounted in a tension tube is activated and pressurized gas is generated when required. In this case, the pressurized gas is transmitted in the tensioning tube and drives, for example, a turbine coupled to the shaft of the belt retractor in order to tension the belt slack.
For the belt tensioner to function optimally, the micro gas generator must be fitted sufficiently pressure-tightly in the tensioning tube. For this purpose, the micro gas generator is generally welded to the tension tube. However, such tensioner assemblies are costly in their manufacturing process.
Disclosure of Invention
The object of the invention is to provide a tensioner assembly that is optimized with regard to overpressure stability and production costs.
According to the invention, this object is achieved by a tensioner assembly for a belt tensioner, comprising a tensioning tube and a micro gas generator arranged at least partially in the tensioning tube, the micro gas generator having a holder, an ignition unit and a deflagration charge container filled with deflagration charge, wherein the tensioning tube has a support against which the micro gas generator rests, and wherein the tensioning tube has a radially inwardly crimped section by means of which the micro gas generator is held in the tensioning tube, and wherein the micro gas generator is waisted, wherein the crimped section of the tensioning tube is arranged in the waisted region of the micro gas generator.
Such a tensioner assembly has the advantage that the miniature gas generator is reliably and sufficiently pressure-tightly held in the tension tube. Furthermore, the tensioner assembly is simple and cost-effective to manufacture. Furthermore, the tension tube can be used as a carrier member when triggering the micro gas generator. In this case, the effective diameter of the pressure in the tube is reduced when the micro gas generator is activated, which in turn has a favorable effect on the overpressure stability.
Since the crimped section of the tension tube is arranged in the waisted region of the micro gas generator, the micro gas generator is fixed to the tension tube in a form-fitting manner and cannot be detached from this tension tube without being destroyed. The crimped section of the tensioning tube is arranged, for example, between the ignition unit and the holder.
A further advantage is that the holder can be made of plastic, since no higher temperatures are generated when shaping the tension tube, as may be the case, for example, in a welding process.
The support against which the micro gas generator rests (in particular due to the narrowing of the pipe diameter) is at a distance from the free end of the tension tube. In particular, the end face of the micro gas generator located in the tension tube can abut against this support.
Preferably, one end of the tension tube is crimped radially inward. In principle, it is also possible to form the region of the tension tube spaced apart from the end inward, for example in the form of a radially inwardly projecting, in particular annular, punch. However, the crimped section can be produced more simply on the end of the tension tube.
The beam waist is formed, for example, by a conical section of the ignition unit. The crimped section of the tensioning tube can lie flush against the tapered section. This results in a good seal between the micro gas generator and the tension tube, wherein complex geometries at the connection points can be dispensed with.
The ignition unit is preferably connected to the holder. According to one embodiment, the micro gas generator may be preassembled as an assembly. Thereby, the operation in the manufacturing process becomes simple. Alternatively, the deflagration charge container and the ignition unit together with the retainer may be present as separate components or assemblies prior to assembly in the tension tube. According to a further embodiment, a connection can be established between the ignition unit and the holder during crimping of the tension tube. In this way, the advantage is achieved that the holder is reliably connected to the tensioner assembly, wherein fewer manufacturing steps are required.
According to one embodiment, the ignition unit and the holder are connected by a sleeve, which abuts against a conical section of the ignition unit.
In this case, the ignition unit and/or the holder can be connected to the sleeve in a force-fitting manner, a form-fitting manner or by means of an adhesive connection. For example, the sleeve is clamped on a conical section of the ignition unit.
The sleeve preferably forms a deflagration charge receptacle. Thereby, the number of required components can be kept low, whereby the tensioner assembly can be manufactured cost-effectively.
According to a preferred embodiment, the sleeve has a radially inwardly directed, circumferential stamped-out part which forms a support for the ignition unit. The assembly, in particular the positioning, of the ignition unit in the sleeve is thereby particularly simple. The ignition unit can simply be pushed into the sleeve until it touches the punch.
In order to achieve an improved seal between the sleeve and the ignition unit, an O-ring can bear against the punch on the inside of the sleeve. The O-ring is arranged in particular between the punch and the ignition unit.
In an alternative embodiment, a holding element can be provided on the holder to connect the ignition unit with the holder. The holding elements are, for example, latching elements which snap into, in particular engage around, the widened section of the ignition unit on the ignition unit and thereby fix the ignition unit to the holder in a form-fitting manner. The sleeve may be omitted in this embodiment.
Furthermore, according to the invention, this object is achieved by a method for manufacturing a tensioner assembly for a belt tensioner, the tensioner assembly comprising a tension tube and a micro gas generator, wherein the micro gas generator has a holder, an ignition unit and a deflagration charge container, the deflagration charge container being filled with deflagration charge, the method comprising the steps of:
a) connecting the ignition unit with the holder,
b) pushing the deflagration charge container, the ignition unit and the retainer into the tension tube,
c) shaping the tension tube such that the micro gas generator is securely held in the tension tube.
In this way, a pressure-tight connection of the microgenerator to the tensioning tube is achieved, wherein the production of the tensioner assembly is simple and cost-effective.
In order to further simplify the manufacturing process, in particular to reduce the number of required process steps, steps a) and c) can be carried out simultaneously, wherein the ignition unit is connected with the holder by shaping the tension tube.
Drawings
Further advantages and features of the invention emerge from the following description and the following drawings, and reference is made to these drawings. In the drawings:
Figure 1 shows a first embodiment of a tensioner assembly according to the invention, and
figures 2 to 5 show further embodiments of the tensioner assembly according to the present invention.
Detailed Description
Fig. 1 shows a tensioner assembly 10 for a belt tensioner in a cross-sectional view. The tensioner assembly 10 includes a tension tube 12 that directs gas in a triggered condition and a micro gas generator 14 mounted at least partially within the tension tube 12. The micro gas generator 14 has a holder 16, an ignition unit 18 and a deflagration charge holder 20 which is filled with deflagration charge 22 which, in the event of a triggering, produces gas under pressure. In the illustrated embodiment, the deflagration charge holder 20 is a sleeve 24 (in particular made of metal). An electrical contact 17 in the form of a pin is provided on the holder 16.
The sleeve 24 has a radially inwardly directed, circumferential (in particular annular) punch 26. The punch 26 forms a support for the ignition unit 18 and thus serves to locate the ignition unit 18 in the sleeve 24. For better sealing, the O-ring 28 bears against the punch 26 on the inside of the sleeve 24, in particular between the punch 26 and the ignition unit 18.
The tension tube 12 has a support 30 against which the micro gas generator 14 rests. The support 30 is formed by a narrowing in the diameter of the pipe, wherein the diameter of the tension tube 12 at the location of the narrowing is smaller than the diameter of the micro gas generator 14.
In order to fix the micro gas generator 14 in the tension tube 12, the tension tube 12 has a radially inwardly crimped section 32, in particular in the waisted region of the micro gas generator 14. In particular, the tension tube 12 is crimped radially inward at one end.
The waisted region of the micro gas generator 14 is located at the transition from the ignition unit 18 to the holder 16. The ignition unit 18 has a conical section 34 which narrows radially inward toward the holder 16 and thus forms a waisted region.
In the illustrated embodiment, the holder 16 bears in sections against the ignition unit 18, in particular against a conical section 34 of the ignition unit 18. For this purpose, the holder 16 has an at least partially circumferential collar 36 which widens in the longitudinal direction of the tension tube 12 at the same angle as the conical section 34.
The holder 16 and the ignition unit 18 are connected to one another both by the sleeve 24 and by a crimped section 32 of the tension tube 12.
When the tensioner assembly 10 is manufactured, for example, the deflagration charge holder 20, the ignition unit 18 and the retainer 16 are pushed into the tension tube 12. The tension tube 12 is then shaped at its end such that a crimped section 32 is formed, which bears against a conical section 34 of the ignition unit 18; and securely holds the micro gas generator 14 in the tension tube 12.
The sleeve 24 may also be formed simultaneously during the forming of the tension tube 12. Alternatively, however, it is also possible to form the sleeve 24 before the tension tube 12 is formed, in particular then to push the micro gas generator into the tension tube, so that the micro gas generator 14 forms a preassembled, easy-to-handle assembly.
Fig. 2 shows a further embodiment of a tensioner assembly 10 according to the present invention in a cross-sectional view.
For the same structures known from the above embodiments having the same function, the same reference numerals are used below and reference is made to the previous description for that matter, wherein the differences of the respective embodiments will be discussed below in order to avoid repetitions.
Unlike the embodiment shown in fig. 1, in the embodiment according to fig. 2 the sleeve 24 is elongate and extends beyond the ignition unit 18 up to the end of the holder 16, i.e. the sleeve 24 ends flush with the holder 16. The holder 16 can be fixed in the sleeve 24 in a non-positive, positive or adhesive-like manner and connected to the ignition unit 18 in this way.
Fig. 3 shows a further embodiment of a tensioner assembly 10 according to the present invention in a cross-sectional view.
Unlike the embodiment shown in fig. 2, in this embodiment, the sleeve 24 is open at both ends. Thus, the sleeve 24 may be pre-fabricated with an internal profile for receiving the ignition unit 18 and the retainer 16.
In order to produce the micro gas generator 14 according to fig. 3, the ignition unit 18 and the O-ring 28 are pushed into the sleeve 24 from the front, in particular via the end of the sleeve 24 which is arranged in the tension tube 12 after assembly. Subsequently, the sleeve 24 is shaped from the outside so that the ignition unit 18 is held in place and the micro gas generator 14 is sealed by means of the O-ring 28. The sleeve is then filled with deflagration packing 22.
At the end of the sleeve 24 oriented away from the holder 16, in particular at the end of the micro gas generator 14 arranged in the tension tube 12, the sleeve 24 is closed by a burst bottom 38. In the event of a trigger, this burst bottom may rupture and pressurized gas may flow through the tension tube 12.
Fig. 4 shows a further embodiment of a tensioner assembly 10 according to the present invention in cross-section.
Unlike the above described embodiment, the deflagration charge 22 is filled in a separate, closed deflagration charge container 20.
Before the ignition unit 18 is fitted on the tension tube 12, a deflagration charge holder 20 is inserted into the tension tube 12.
Here, the sleeve 24 serves only to connect the ignition unit 18 and the holder 16. Here, the contour of the sleeve 24 is adapted to the outer contour of the ignition unit 18 and the holder 16. The sleeve 24 surrounds the ignition unit 18 in such a way that it is connected to the sleeve 24 in a form-fitting manner. For this purpose, the end of the sleeve 24 surrounding the ignition unit 18 is shaped radially inwards.
The sleeve 24 can be prefabricated largely in an internal contour. After the ignition unit 18 is fitted in the sleeve 24, the free end of the sleeve 24 is shaped to secure the ignition unit 18.
Fig. 5 shows a further embodiment of a tensioner assembly 10 according to the present invention in cross-section.
According to this embodiment, the holder 16 has a holding element 40 to interconnect the ignition unit 18 and the holder 16. The holding elements 40 are in particular latching elements or clip elements which engage at least partially around the ignition unit 18 and thereby fix the ignition unit 18 to the holder 16 in a form-fitting manner. The sleeve may be omitted in this embodiment.
The holder 16 is, for example, a plastic injection-molded part, wherein the holding element 40 is formed integrally with the holder 16.
Claims (10)
1. A tensioner assembly (10) for a belt tensioner, the tensioner assembly comprising a tension tube (12) and a micro gas generator (14) arranged at least partially in the tension tube (12), the micro gas generator having a holder (16), an ignition unit (18) and a deflagration charge vessel (20), the deflagration charge vessel being filled with deflagration charge (22),
wherein the tension tube (12) has a support (30) against which the micro gas generator (14) rests,
wherein the tension tube (12) has a radially inwardly crimped section (32) by which the micro gas generator (14) is held in the tension tube (12), and wherein
The micro gas generator (14) is waisted, wherein the crimped section (32) of the tension tube (12) is arranged in the waisted region of the micro gas generator (14).
2. The tensioner assembly (10) of claim 1, wherein the waisted portion is formed by a tapered section (34) of the firing unit (18).
3. The tensioner assembly (10) of one of the preceding claims, wherein the ignition unit (18) is connected with the retainer (16).
4. The tensioner assembly (10) of claim 3, wherein the ignition unit (18) and the retainer (16) are connected by a sleeve (24) that abuts a tapered section of the ignition unit (18).
5. The tensioner assembly (10) of claim 4, characterized in that the ignition unit (18) and/or the retainer (16) are connected with the sleeve (24) in a force-fitting manner, a form-fitting manner or by means of an adhesive connection, respectively.
6. The tensioner assembly (10) of one of claims 4 to 5, characterized in that the sleeve (24) forms the deflagration charge receptacle (20).
7. The tensioner assembly (10) of one of claims 4 to 6, characterized in that the sleeve (24) has a radially inwardly directed, circumferential punch (26) which forms a support for the ignition unit (18).
8. The tensioner assembly (10) of claim 7, wherein an O-ring (28) abuts the punch on the inside of the sleeve (24).
9. A method for manufacturing a tensioner assembly (10) for a belt tensioner, the tensioner assembly comprising a tension tube (12) and a micro gas generator (14), wherein the micro gas generator (14) has a holder (16), an ignition unit (18) and a deflagration charge container (20), the deflagration charge container being filled with deflagration charge (22), the method comprising the steps of:
a) Connecting the ignition unit (18) with the holder (16),
b) -pushing the deflagration charge container (20), the ignition unit (18) and the holder (16) into the tension tube (12),
c) shaping the tension tube (12) such that the micro gas generator (14) is securely held in the tension tube (12).
10. Method according to claim 9, characterized in that step a) and step c) are performed simultaneously, wherein the ignition unit (18) is connected with the holder (16) by shaping the tension tube (12).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018108994.5A DE102018108994A1 (en) | 2018-04-16 | 2018-04-16 | A pretensioner assembly for a seatbelt pretensioner and method for manufacturing a pretensioner assembly |
| DE102018108994.5 | 2018-04-16 | ||
| PCT/EP2019/059223 WO2019201728A1 (en) | 2018-04-16 | 2019-04-11 | Pretensioner assembly for a seat belt pretensioner, and method for manufacturing a pretensioner assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111989244A true CN111989244A (en) | 2020-11-24 |
Family
ID=66597520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980026516.4A Pending CN111989244A (en) | 2018-04-16 | 2019-04-11 | Tensioner assembly for a belt tensioner and method of manufacturing a tensioner assembly |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN111989244A (en) |
| DE (1) | DE102018108994A1 (en) |
| WO (1) | WO2019201728A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4289685A1 (en) * | 2022-06-08 | 2023-12-13 | Autoliv Development AB | A safety device in a vehicle |
| EP4289682A1 (en) * | 2022-06-08 | 2023-12-13 | Autoliv Development AB | A safety device in a vehicle |
| EP4289684A1 (en) * | 2022-06-08 | 2023-12-13 | Autoliv Development AB | A safety device in a vehicle |
| EP4289681A1 (en) * | 2022-06-08 | 2023-12-13 | Autoliv Development AB | Safety device in a vehicle |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT5978U1 (en) * | 2002-03-08 | 2003-02-25 | Hirtenberger Automotive Safety | PYROTECHNICAL GAS GENERATOR |
| GB2399137A (en) * | 2003-03-06 | 2004-09-08 | Autoliv Dev | Releasable safety clip |
| KR101298856B1 (en) * | 2007-07-06 | 2013-08-21 | 마츠모토 쥬코교 가부시키가이샤 | Pretensioner and process for manufacturing the same |
| AT513494B1 (en) * | 2012-10-24 | 2014-05-15 | Hirtenberger Automotive Safety Gmbh & Co Kg | Tripping device for a belt tensioner |
| DE202013104757U1 (en) * | 2012-10-24 | 2013-11-21 | Hirtenberger Automotive Safety Gmbh & Co. Kg | Tripping device for a belt tensioner |
| DE102012023031B4 (en) * | 2012-11-26 | 2023-02-23 | Zf Automotive Germany Gmbh | Belt tensioner for a vehicle occupant restraint system |
-
2018
- 2018-04-16 DE DE102018108994.5A patent/DE102018108994A1/en active Pending
-
2019
- 2019-04-11 WO PCT/EP2019/059223 patent/WO2019201728A1/en active Application Filing
- 2019-04-11 CN CN201980026516.4A patent/CN111989244A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019201728A1 (en) | 2019-10-24 |
| DE102018108994A1 (en) | 2019-10-17 |
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