DE19909426B4 - airbag unit - Google Patents

Abstract

Airbag unit, in particular a sidebag or passenger airbag module, with an airbag and a gas generator for inflating the gas bag, the gas generator and the gas bag in one of two by locking elements together connected parts existing housing are arranged, thereby characterized that a Securing part (25) is provided with which the two parts (4, 5) the housing additionally are secured in their connected position, the securing part (25) one of the parts (4, 5) of the housing embraces.

Description

The The invention relates to an airbag unit according to the preamble of the claim 1.

It is known to protect occupants of a motor vehicle in a Airbag units arranged in an accident at suitable points on the vehicle. An airbag unit includes an inflatable gas bag in the event of a crash and a protective cushion a gas generator that generates the gas required for inflation and / or releases. To trigger The airbag unit is provided with sensors with which a crash occurs can be registered.

In As a rule, the gas bag consists of a fabric and is not in the inflated state folded up and in a protective Housing housed, in which the gas generator can also be integrated. For connecting the gas bag Various methods have become known for the gas generator. Usually the gas bag has an injection opening at one point, via which it is connected to the gas generator. For example, the Edge of the injection opening be clamped by means of a retaining ring, which is connected to the gas generator is screwed or riveted. It was also suggested that Sew the ring into the fabric. If the gas generator with the housing to protect the gas bag is connected or integrated therein, the gas bag with its inflation opening also on this housing instead of being attached to the gas generator.

The Assembly, d. H. the attachment of the airbag unit to the vehicle is greatly facilitated if all components of the airbag unit combined into a complete module, advantageously in one housing are. An airbag module can also be replaced or retrofitted simplified. A housing also offers additional protection for the components of the airbag unit.

It Various housing arrangements of this type have already become known.

In the EP 619 204 A2 describes an airbag unit for retrofitting in a glove box. For this purpose, the airbag unit is arranged in a housing which is formed by a carrier for its attachment in an open recess (the glove compartment) and a cover flap, the outer contour of which is adapted to the geometry of the recess. A disadvantage of this airbag module is the need to adapt the housing to different vehicle types.

The WO 91/03391 A1 describes a combined housing and heat shield arrangement. The housing is formed by a sheet bent into a cylinder, are introduced into the slots in such a way that after bending of the sheet rectangular sections wing-like from the cylinder circumference protrude. The gas generator is in the cylinder by screws held, and the gas bag is attached to the housing so that the gas generator lies within the gas bag. The wing-like sections protect it Airbag fabric in front of the hot gases released by the gas generator. The entire arrangement is inserted into a second outer housing for protection.

The DE 42 23 620 A1 describes a sidebag arrangement in which the gas flow generated by the gas generator is directed directly upwards into the gas bag, so that the gas bag is inflated upwards. In one embodiment, the gas generator is accommodated in a guide housing, which in turn is enclosed by the gas bag.

In the DE 195 16 255 A1 describes an airbag module with an airbag, at least one gas generator assigned to it and a cover, in which the cover can be connected at least partially in a form-fitting manner to an assembly carrying the gas generator. The gas generator is connected to the gas bag on the one hand and the assembly on the other by screws or rivets. The positive connection between the cover and the support of the assembly takes place via profiled sections on the cover, which engage in corresponding recesses in the assembly which supports the gas generator.

The Arrangements described have the disadvantage that they are expensive to assemble require, sometimes using special tools.

To overcome these disadvantages is in the GB 2 323 572 A proposed to fix the gas bag on a locking frame or ring, which has a plurality of hooks on which the edge of the gas bag is held. The hooks engage in openings on the housing and the edge of the gas bag is wrapped around the lower edge of the frame or ring.

Furthermore, the disclose DE 196 41 641 A1 and the DE 298 14 233 A1 each airbag units with a one-piece housing. in which a holding part for fixing the gas bag and for fixing the gas generator is locked. The gas bag is held on the holding part by the locking projections, which are threaded through corresponding openings in the gas bag.

This Airbag units do have easily mountable housings or a simple definition of the gas bag. However, will be sufficient for one secure connection of the housing parts or the holding part requires a large number of individual locking elements. hereby becomes an undesirable complicated manufacture of these parts.

The The invention has for its object a simple and Easy to assemble airbag unit to provide its individual parts do not require complex manufacturing facilities.

To The invention solves this problem in a generic airbag unit solved by the characterizing features of claim 1.

at an airbag unit with a gas bag and a gas generator for Inflating the gas bag, the gas generator with the gas bag in one housing is housed, which consists of two interconnected by locking elements Parts exists, it is provided that the two parts by one Securing part to be secured in their connected position. there is preferably the first part of the housing for receiving the gas bag and the second part is provided for receiving the gas generator. In this In particular, the first part of the housing preferably consists of glass fiber reinforced plastic, z. B. polyamide. Both parts, especially the second part, can also are made of die-cast aluminum.

The both parts are preferably, but not necessarily, formed in one piece.

The Airbag module according to the invention let yourself assemble without tools in a simple way by the first and the second part can be locked together.

It it is appropriate that the gas bag is fixed by placing it between the first and the second part of the housing is pinched. This will make the parts rattle at the same time prevented and a certain tolerance compensation achieved.

to The gas bag can also be fastened in the region of its injection opening Have slots through the protrusions on the first and or second Part led become. The gas bag is preferably also turned around in the region of its injection opening put the first part around.

In a preferred embodiment form the locking elements for connecting the first and second parts the projections mentioned.

It has been shown that a Attachment on two long sides of the gas bag is sufficient so that in this embodiment a particularly simple module structure can be realized from a few parts. Essentially Such an airbag unit according to the invention consists of only four Share, namely Gas bag, the gas generator and the first and second part of the housing.

In another preferred embodiment the gas bag is attached to a holding part, the in the housing is arranged, on the holding part fastening means (in particular in the form of hooks) for fixing it to the first and / or second Part of the housing are provided by plugging on. It is useful to form the fastening means at the same time the projections for fastening the gas bag.

Further the holding part has at least one angled section, which is positively received between the first and the second part of the housing and being pinched. This angled section can assigned a stop to the first and / or second part of the housing against which the angled section is due to when unfolding forces acting on the gas bag depressed becomes.

to Attachment of the gas bag to the holding part can also be provided be that the Gas bag in the area of its injection opening around the angled one End section is laid around.

This embodiment has the advantage that Absorption of forces a stable holding part made of sheet metal can be provided during the deployment can. This offers the further advantage, the fabric of the gas bag to protect against the hot gases emerging from the gas generator.

The The gas generator can either be simply inserted into the second housing part (which is preferably designed as a lower part) inserted or be snapped into this. With a cylindrical gas generator, such as he z. B. for Sidebags and passenger airbags is common can for this purpose, locking elements can be provided in the interior of the lower part. As Locking elements are suitable, for example, locking lugs that cover the circumference of the cylindrical gas generator. Furthermore, the diameter of the gas generator be reduced at one end and the gas generator with this end section of smaller diameter in a corresponding Recess of the lower part are inserted. Even the definition by screws and the like Lanyards are possible.

If necessary, the holding part of the gas bag can also be used to fix the gas generator. For this, the depth of the lower part at the through Adjusted the knife of the gas generator so that the holding part clamps the gas generator when the upper and lower parts of the housing are locked.

It is possible, too, no separate lower housing part to provide and the housing the gas generator itself with the locking elements for connection with to equip the top. However, this has the disadvantage that conventional Gas generators cannot be used without adaptation and exchange of the gas generator requires a complete removal of the airbag module. Furthermore, the gas outlet is often located at one end of the gas generator. It is therefore mostly advantageous if the gas generator is in a separate one Lower part is included. This as essentially gas-tight container executed The lower part then serves both as a collection and as a targeted introduction of the gas in the gas bag.

Preferably is the gas generated by the gas generator via a on the first housing part or the diffuser integrally molded into the gas bag. On in the middle of of the gas generator arranged chimney-like diffuser, which mainly the gas leads above, has proven to be particularly suitable for this. By this configuration allows the forces acting on the housing to be so far reduce that casing is made of plastic. According to the invention, the weight of the Airbag unit can be significantly reduced.

to Improvement in the inflation behavior can also be seen in the gas bag centrally arranged fabric diffuser can be provided. Preferably this is formed by a web of fabric on the long sides of the gas bag sewn to it is. This will make it stronger Side inflation of the airbag is achieved after this from the casing leaked. It is appropriate that the fabric diffuser also serves as flame protection. The tissue diffuser is reduced the danger for one not in the normal sitting position (out of position) Occupants to be shot by the gas bag considerably. to further reduction in the risk of shooting in the OOP case can in known the trigger threshold the airbag unit by appropriate sensors and / or module-integrated activities customized become.

ever after where the airbag module according to the invention is used, the upper housing part (first Part) at its top either open, through a fleece or Paper cover closed, or it shows one through the Airbag to open when inflating Lock on. The clasp will in a known manner in its surface structure to the environment adapted to the installation location of the airbag module. The design of the closure and the mechanism by which it opens when inflated known per se and shall not be described in more detail here.

at Sidebags that predominate into a vehicle door or armrest are installed, as well as for the subsequent Installation is an open top part of the housing or a fleece cover that is easily destroyed by the inflating airbag particularly suitable. With passenger airbags, one is in the environment adapted to the installation site Closure provided, which is opened by the gas bag when inflating along predetermined tear lines.

advantageously, becomes the airbag module according to the invention mounted so that the Airbag is attached to the first part or the holding part, if necessary the holding part is placed on the first or second part of the housing the gas generator is arranged in the second part and that first and second parts are locked together. The gas bag can be in the first part both before and after locking be folded.

at a folding of the gas bag before locking the housing possibly a thin one Plastic ring that over Bridges with the housing is connected as a placeholder for serve the diffuser. This can either be in the final assembly Airbag unit remain or removed after inserting the diffuser become.

By the two-part housing is also a particularly simple adaptation of the airbag unit according to the invention to the geometries of different vehicle types possible. Because the dimensions are more common Gas generators usually differ little from each other, that can second part of the housing be manufactured as a standard component, and only the first part will to the required ones Adjusted the gas bag and the installation space in the vehicle.

to Attachment of the airbag unit to a motor vehicle is used preferably the second part of the housing. Conveniently, this is designed as a load-bearing and force-absorbing module part and provided with appropriate means for attachment.

The securing part is preferably designed such that it can be pushed over the parts of the housing which are locked together. It is expedient that the securing part is fixed to the airbag unit when the airbag unit is fastened to the vehicle part. For this purpose, holes can be provided in the securing part, for example, which correspond to corresponding holes in a fastening element for fastening the airbag unit by means of screws or rivets on the vehicle part cover.

The In the following, the invention will be explained in more detail by the attached figures.

It demonstrate:

1 a cross section through an inventive sidebag module;

2a a longitudinal section through the sidebag module 1 ;

2 B a second longitudinal section through the sidebag module 1 ;

3a a gas bag for use in the sidebag module according to 1 and 2 ;

3b a section along AA in 3a ;

3c the gas bag placed around a holding plate 3a and 3b in cross section;

4 a perspective view of the sidebag module according to the invention before assembly;

5 a perspective view of the sidebag module according to the invention after assembly;

6a a section through a device for folding an airbag into an inventive sidebag module;

6b the cut out 6a after the first folding step;

6c the cut out 6a and 6b after folding;

7a a view of a passenger airbag module according to the invention from below;

7b a section along AA in 7a ;

7c a section along BB in 7a ;

7d a perspective view of the passenger airbag module according to the invention before assembly;

8th a section through a further passenger airbag module according to the invention;

9 a perspective view of another sidebag module according to the invention before assembly;

10 the sidebag module 9 after assembly.

1 shows a cross section through a sidebag module 1 with an airbag 2 and a substantially cylindrical gas generator 3 in a first part (upper part 4 ) and a second part (lower part 5 ) comprehensive housing, which consists of a glass fiber reinforced plastic. The top 4 is with the lower part 5 via locking elements not shown here 6 (Comp. 2 B ) connected.

The gas generator 3 is over latches 7 (see also 2 and 4 ) in the lower part 5 of the housing. The gas bag shown only partially 2 is in the top 4 accommodated. He is with a bracket 8th connected that by means of hooks 9 on the top 4 is fixed and with its angled lateral end sections 18 between the top 4 and the lower part 5 is jammed. The clamping effect also covers the edge of the gas bag 2 that is around the angled side end section 18 of the holding plate 8th is laid around and the slots 14 (Comp. 3a ) from the hook 9 be penetrated.

2a provides a longitudinal section through the in 1 shown sidebag module 1 represents, the gas bag 2 is not shown for the sake of clarity.

According to 2a are on the top 4 the housing fasteners 10 provided with which the airbag module 1 is attached to the vehicle. The gas generator 3 is in the lower part 5 of the housing in addition to the above-mentioned locking by locking lugs 7 through an end section with a smaller diameter 11 set in a recess 12 of the lower part 5 is inserted.

That for fastening the gas bag 2 serving bracket 8th has an opening 13 on through which the gas generator 3 released gas in the gas bag 2 arrives.

According to the longitudinal section 2 B through the side latches 7 to fix the gas generator 3 runs, are also the locking elements 6 recognizable by means of the upper part 4 and lower part 5 are connected.

3a shows an airbag 2 for the airbag module 1 according to 1 and 2 , At the edge of the airbag injection opening 2 are slits 14 provided by which to attach the gas bag 2 on the bracket 8th the hooks 9 of the holding plate 8th be performed.

In 3b is a cross section through the gas bag 2 out 3a shown. It is clear that the fabric of the gas bag in the area of the slots 14 is laid twice to tear out the gas bag 2 to prevent.

3c shows the on the bracket 8th attached and around the edge of the retaining plate 8th gas bag lying around 2 , being on the bracket 8th molded hook 9 through the slots 14 of the gas bag 2 were carried out in the area of the gas bag 2 are provided.

In the 4 and 5 the sidebag module is shown in a perspective view before and after the assembly of the module in order to illustrate the ease of assembly. The gas bag 2 is for reasons of clarity in the 4 and 5 not shown.

The gas generator is used for assembly 3 with the end section of smaller diameter 11 into the recess 12 of the lower part 5 inserted and by means of the locking lugs 7 locked. The other is the catch 9 of the holding plate 8th into the slots 14 of the gas bag 2 introduced and then the holding plate 8th together with the gas bag 2 until his in the 1 and 2 shown end position in the upper part 4 inserted, the hook 9 of the holding plate 8th on the top 4 be put. Furthermore, the gas bag 2 directly into the top 4 of the case folded.

Finally, the top 4 and the bottom 5 the housing via the locking elements provided for this purpose 6 locked. The holding plate 8th with their angled side end sections 18 together with the gas bag 2 between the top 4 and the lower part 5 pinched, see 1 , on the basis of which it also becomes clear that when the airbag unfolds 2 the clamping effect is increased due to the forces acting in the clamping areas. Because of these forces, the angled end sections 18 of the holding plate 8th against attacks 19 pressed that on the top 4 of the housing are provided.

The fully assembled airbag module 1 is in 5 shown.

In the 6a to 6c is the folding of an airbag 2 in the top 4 an airbag module according to the invention 1 schematically illustrated. The one on the holding part 8th attached gas bag 2 and the top 4 For this purpose, the housing is introduced into a suitable device, as is known in the prior art. This folds the fabric of the gas bag 2 by successively compressing the device walls in the direction of the arrow to a size that stows the gas bag 2 in the top 4 allows.

In the 7a is a view of a passenger airbag module according to the invention 1 shown from below. One can see an end of the gas generator 3 , a top 4 and a bottom 5 a housing and the locking elements 6 with which the parts 4 . 5 are connected. In this module is the gas bag 2 without holding part directly between the top part 4 and the lower part 5 trapped.

The 7b makes a section along the line AA in 7a Here it is clear that the gas generator 3 in the lower part 5 and the gas bag 2 in the top 4 of the housing 4 . 5 is arranged. Here is the gas bag 2 when locking the upper part 4 and lower part 5 fixed and pinched between them. As locking elements 6 are on the top 4 lugs inside and below and on the lower part 5 corresponding recesses are provided.

The bottom part 5 has an integrally molded chimney-like diffuser 20 on whose opening 13 is directed upwards. This will make the gas bag 2 inflated when inflated, which reduces the stress on the fabric and the housing. This means in particular that the top 4 is not burdened by the gas flow, so that it can be easily formed accordingly.

In addition, there is a fabric diffuser to improve the inflation behavior 21 provided that over the diffuser 20 in the middle of the gas bag 2 is arranged. The fabric diffuser 21 also serves as flame protection.

7c shows a section through the passenger airbag module 1 out 7a along the line BB. There are footbridges here 22 recognizable that the fireplace-like diffuser 20 stabilize. Furthermore, here is the definition of the gas generator 3 in the lower part 5 via a retaining ring 23 and a screw connection 24 shown. The retaining ring 23 also seals the lower part 5 against the environment and on the other hand also balances the manufacturing tolerances of the gas generator 3 out.

In 7d is the passenger airbag module according to the invention 1 shown in an exploded view.

At the very top in 7d is the gas bag 2 with the fabric diffuser 21 shown. In the lower area there is an airbag 2 slots 14 through which the locking elements 6 of the top 4 can be performed.

The top 4 shows in a taper the area inside lugs as locking elements 6 on. Additionally are at the bottom of the top 4 more noses 6 provided when inflating the gas bag 2 a bending up of the top 4 should prevent.

In the lower part 5 are as locking elements 6 Recesses for the noses of the upper part 4 educated. The opening 13 for introducing the gas into the gas bag 2 is through the chimney-like diffuser 20 in the folded gas bag 2 relocated. The gas generator 3 is over a retaining ring 23 and a screw connection 24 in the lower part 5 established. To do this, he is laterally in the lower part 5 with the pre-assembled retaining ring 23 inserted and by means of the screw connection 24 attached. This will make the lower part 5 sealed to a substantially gas-tight container.

In 8th is a further preferred embodiment in cross section for a passenger airbag module according to the invention 1 with a housing made of an upper part 5 and lower part 4 shown. The module 1 has a gas generator 3 on the one with a chimney-like diffuser 20 provided lower part 4 is arranged. The gas bag 2 is in the folded state around the diffuser 20 folded and between top 4 and lower part 5 clamped. The locking elements 6 on the top 4 are through slots 14 in the gas bag 2 guided and engage in corresponding recesses in the lower part 5 on. The present arrangement offers the advantage that for the fastening elements (not shown here) for fastening the module 1 on a motor vehicle a particularly variable arrangement on the lower part 5 is possible.

In the 9 and 10 Another sidebag module according to the invention is shown. This module 1 has a housing with an upper part 4 for receiving an airbag (not shown here) and a lower part 5 to accommodate a gas generator 3 on. To fix the gas bag 2 on the housing is analogous to the embodiment in the 1 to 5 a bracket 8th intended. To determine the gas generator 3 in the lower part 5 are also analogous to the module in the 1 to 5 locking elements 7 and a recess 12 in the lower part 5 arranged.

The 9 shows the module 1 without airbag before assembly and in 10 is the fully assembled module 1 shown.

A fuse part 25 is designed so that it locks after the upper part 4 and lower part 5 can be pushed from below over the housing. The safety part 25 has a fastener 26 with which it is used when attaching the assembled module 1 on a vehicle part by means of the on the upper part 4 existing fasteners 10 on the top 4 is set. While fixing on the top 4 through the fasteners 26 takes place, the lower part 5 of two brackets 27 encompassed. So the connection between the upper part 4 and lower part 5 through the locking elements 6 with the securing part 25 additionally secured. The fasteners 10 and 26 have equally spaced holes in this embodiment 28 on which the module 1 z. B. is attached to the vehicle part by means of screws.

The Airbag modules according to the invention are particularly easy to assemble and inexpensive to manufacture because the Number of required Parts was greatly reduced. About that leads out the use of plastic for the housing to a weight loss.

1

airbag module

2

airbag

3

inflator

4

top

5

lower part

6

locking elements

7

locking lugs

8th

Halteblech

9

hook

10

fastener

11

end with a smaller diameter

12

recess

13

opening

14

slots

18

angled end

19

attack

20

diffuser

21

fabric diffuser

22

web

23

retaining ring

24

screw

25

securing part

26

Befestigungslement

27

hanger

Claims (35)

Airbag unit, in particular a sidebag or passenger airbag module, with a gas bag and a gas generator for inflating the gas bag, the gas generator and the gas bag being arranged in a housing consisting of two parts connected by latching elements, characterized in that a securing part ( 25 ) is provided with which the two parts ( 4 . 5 ) of the housing are additionally secured in their connected position, the securing part ( 25 ) one of the parts ( 4 . 5 ) of the housing. Airbag unit according to claim 1, characterized ge indicates that the safety part ( 25 ) is designed so that it over the interlocked parts ( 4 . 5 ) the housing is slidable. Airbag unit according to claim 1 or 2, characterized in that the securing part ( 25 ) when attaching the airbag unit ( 1 ) on a vehicle part using fastening elements ( 26 ) on the airbag unit ( 1 ) can be determined. Airbag unit according to claim 3, characterized in that the securing part ( 25 ) Hanger ( 27 ) which the lower part ( 5 ) and the fasteners ( 26 ) the safety part ( 25 ) on the top ( 4 ) establish. Airbag unit according to one of the preceding claims, characterized in that the first part ( 4 ) of the housing for receiving the gas bag ( 2 ) and the second part ( 5 ) to accommodate the gas generator ( 3 ) is provided. Airbag unit according to one of the preceding claims, characterized in that the gas bag ( 2 ) between the first and the second part ( 4 . 5 ) is pinched. Airbag unit according to one of the preceding claims, characterized in that the gas bag ( 2 ) on the first part ( 4 ) and / or the second part ( 5 ) is attached. Airbag unit according to one of claims 1 to 6, characterized in that the gas bag ( 2 ) on a holding part ( 8th ) is attached, which is positively fixed in the housing. Airbag unit according to one of the preceding claims, characterized in that the gas bag ( 2 ) slots in the area of its injection opening ( 14 ) through which it is fastened in the housing. Airbag unit according to claim 6, characterized in that for fastening the gas bag ( 2 ) serve in the housing protrusions that the slots ( 14 ) reach through. Airbag unit according to one of the preceding claims, characterized in that the gas bag ( 2 ) in the area of its injection opening around the first part ( 4 ) is lying around. Airbag unit according to one of the preceding claims, characterized in that at least some of the latching elements ( 6 ) to connect the first and second part ( 4 . 5 ) the projections for attaching the gas bag ( 2 ) form. Airbag unit according to claims 8 and 12, characterized in that the projections on the holding part ( 8th ) are provided. Airbag unit according to one of claims 8 to 13, characterized in that on the holding part ( 8th ) Fasteners ( 9 ) to fix it on the first and / or second part ( 4 . 5 ) of the housing are provided by plugging on. Airbag unit according to claim 14, characterized in that the fastening means ( 9 ) Hooks are provided. Airbag unit according to one of claims 8 to 15, characterized in that the holding part ( 8th ) at least one angled section ( 18 ) which is between the first and the second part ( 4 . 5 ) of the housing is positively received. Airbag unit according to claim 16, characterized in that the angled section ( 18 ) between the first and the second part ( 4 . 5 ) is jammed. Airbag unit according to claim 16 or 17, characterized in that the angled section ( 18 ) an attack ( 19 ) on the first and / or second part ( 4 . 5 ) of the housing is assigned, against which the angled section due to the unfolding of the gas bag ( 2 ) acting forces is pressed. Airbag unit according to one of claims 11 to 16, characterized in that the gas bag ( 2 ) in the area of its injection opening around the angled section ( 18 ) is lying around. Airbag unit according to one of the preceding claims, characterized in that the gas via a diffuser ( 20 ) in the gas bag ( 2 ) is conducted. Airbag unit according to claim 20, characterized in that the diffuser ( 20 ) is designed like a chimney. Airbag unit according to claim 19 or 20, characterized in that the diffuser ( 20 ) in one piece in the second part ( 5 ) is integrated. Airbag unit according to one of claims 20 to 22, characterized in that in the gas bag ( 2 ) a fabric diffuser ( 21 ) is provided. Airbag unit according to claim 23, characterized in that the fabric diffuser ( 21 ) that from the diffuser ( 20 ) in the gas bag ( 2 ) deflects flowing gas transversely to the inflow direction. Airbag unit according to one of claims 23 or 24, characterized in that the fabric diffuser ( 21 ) by only on the long sides of the gas bag with the gas bag ( 2 ) stitched fabric sheet is formed. Airbag unit according to one of claims 23 to 25, characterized in that the Fabric diffuser also serves as flame protection. Airbag unit according to one of the preceding claims, characterized in that the second part ( 5 ) to accommodate the gas generator ( 3 ) represents an essentially gastight container. Airbag unit according to one of the preceding claims, characterized in that the gas generator ( 3 ) on the second part ( 5 ) can be determined. Airbag unit according to one of the preceding claims, characterized in that the gas generator ( 3 ) with locking elements ( 7 ) and / or screw connections ( 24 ) on the second part ( 5 ) can be determined. Airbag unit according to one of the preceding claims, characterized in that an end section of the gas generator ( 3 ) in a recess ( 12 ) of the second part ( 5 ) can be inserted. Airbag unit according to one of the preceding claims, characterized in that the gas generator is formed by a retaining ring ( 23 ) can be determined on the second part. Airbag unit according to one of the preceding claims, characterized in that the first part ( 4 ) is closed by a fleece cover. Airbag unit according to one of the preceding claims, characterized in that the first part ( 4 ) has a closure which is inflated by the inflating airbag ( 2 ) is opened. Airbag unit according to one of the preceding claims, characterized in that the first part ( 4 ) and / or the second part ( 5 ) is made of plastic. Airbag unit according to one of claims 33 or 34, characterized in that as Plastic a glass fiber reinforced Plastic, especially polyamide, is used.