DE19909426A1 - Air bag module, especially for side- or passenger protection comprises casing made from two parts held together by snap-in catches, simplifying construction and mounting - Google Patents

Abstract

First and second parts (4, 5) of the casing are held together by snap-in catches (6). An Independent claim is also included for the method of mounting the unit.

Description

The invention relates to an airbag unit according to the Oberbe handle of claim 1 and a method for their assembly.

It is known to protect occupants of a motor vehicle in an accident at suitable locations on the vehicle to provide arranged airbag units. An airbag unit includes an inflatable in the event of a crash to a protective cushion Ren gas bag and a gas generator that inflates required gas is generated and / or released. To trigger the Airbag unit sensors are provided with which a Crash case can be registered.  

As a rule, the airbag consists of a woven fabric and is folded in the uninflated state and in housed in a protective housing in which the Gas generator can be integrated. For connecting the gas bag Various methods are known for the gas generator become. The airbag usually points at one point an injection opening through which he connects to the gas generator is connected. For example, the edge of the injection opening can be clamped by means of a painting ring, which with screwed or riveted to the gas generator. It was also suggested sewing the ring into the tissue. If the gas generator with the housing to protect the gas bag connected or integrated into it, the gas bag can also be used its injection opening on this housing instead of the Gas generator to be attached.

The assembly, d. H. the attachment of the airbag unit to the Vehicle is made much easier when all components the airbag unit to a complete module, more advantageous wisely in one housing. An exchange too or retrofitting are combined with an airbag module fold. A housing also offers additional protection for the Airbag unit components.

There are already various housing arrangements of this type known.

EP 619 204 A2 describes an airbag unit for subsequent use Chen assembly described in a Mandschuhablage. Is to the airbag unit is arranged in a housing by a bracket for fixing it in an open hollow (the mandrel holder) and a cover flap is formed,  whose outer contour is adapted to the geometry of the trough. The disadvantage of this airbag module is that it is required Adaptation of the housing to different vehicle types.

WO 91/03391 describes a combined housing and Heat shield arrangement. The housing turns from one to one Cylinder bent sheet metal formed in the slots are introduced in such a way that after bending the Sheet metal rectangular sections wing-like from the zylin the scope stand out. The gas generator is in the cylinder held by screws, and the gas bag is so on the Ge attached to the housing that the gas generator inside the gas sack lies. The wing-like sections protect the gas sack cloth in front of those released by the gas generator hot gases. The entire arrangement is still in protection a second outer housing is used.

DE 42 23 620 A1 describes a sidebag arrangement in the gas flow generated by the gas generator goes straight up is directed into the gas bag so that the gas bag is facing upwards is inflated. In one embodiment, the Gas generator housed in a guide housing, the is in turn enclosed by the gas bag.

DE 195 16 255 A1 describes an airbag module with a Airbag, at least one gas generator assigned to it and a cover described in which the cover to at least partially form-fitting with the gas generator load-bearing assembly is connectable. The connection of the gas generator with the gas bag on the one hand and the assembly on the other hand, by screws or rivets. The form conclusive connection between the cover and the wear  The assembly is made via profiled sections on the Cover that in corresponding recesses in the Intervene in the gas generator supporting assembly.

The arrangements described have the disadvantage that they require elaborate assembly, sometimes with use of special tools.

The invention has for its object a simple assembled and easy to assemble airbag unit ready for put.

According to the invention, this problem is in a genus Airbag unit by the characteristic features of the Claim 1 solved.

In an airbag unit with a gas bag and a gas gene rator for inflating the gas bag, the gas generator with the gas bag in a housing that is made of two connected parts, is before seen that the two parts by locking means together are connected. The first part of the Housing for receiving the gas bag and the second part for Recording the gas generator provided. In this case there is particularly preferred the first part of the housing made of glass fiber reinforced plastic, e.g. B. polyamide. Both Parts, especially the second part, can also be made from light Die-cast metal exist.

The two parts are preferred, but not mandatory, integrally formed.  

The airbag module according to the invention can be in without tools assemble easily by the first and the second Part can be locked together.

It is expedient that the gas bag is attached by between the first and the second part of the housing is pinched. This causes a rattling at the same time the parts prevented and a certain tolerance compensation reached.

The gas bag can be fastened in the area of its on Blow opening further have slots through the projections be performed on the first and / or second part. Preferential The gas bag also becomes wise in the area of its Injection opening placed around the first part.

In a preferred embodiment, the locking elements form te for connecting the first and second parts of the above Ledges.

It has been shown that attachment to two longitudinal cables ten of the gas bag is sufficient so that this Ausfü a particularly simple module structure made up of a few Realize sharing. There is essentially one airbag unit according to the invention of only four parts, namely the gas bag, the gas generator and the first and second part of the housing.

In another preferred embodiment of the invention the gas bag is attached to a painted part that is in the Ge Housing is arranged, with attachment to the holding part medium (especially in the form of hooks) to its Festle tion on the first and / or second part of the housing  Attaching are provided. It is useful to form the fasteners also the projections for fastening gas bag.

Furthermore, the holding part has at least one angled Section on that between the first and the second part of the housing positively received and turned on gets stuck. This angled section can be an knock on the first and / or second part of the housing be assigned, against which the angled section due to the forces acting when the airbag unfolds is pressed.

To attach the gas bag to the holding part can continue be provided that the gas bag in the area of its one blow opening around the angled end portion is.

This embodiment has the advantage that to accommodate the A stable holding part made of sheet metal can be provided. This offers the further advantage the fabric of the gas bag in front of that from the gas generator to protect escaping hot gases.

The gas generator can either simply be in the second housing seteil (which is preferably designed as a lower part) inserted or snapped into place. With a cylinder Rischen gas generator, as he z. B. for Sidebags and Beifah rerairbags can be used in the interior of the sub some locking elements may be provided. Suitable as locking elements For example, locking lugs that cover the circumference of the cylinder grasp the gas generator. Furthermore, the diam water of the gas generator be reduced at one end and the Gas generator with this end section of smaller diameter  sers inserted into a corresponding recess in the lower part be pushed. Also fixing by screws and Similar lanyards are possible.

If necessary, the holding part of the gas bag can also be used Determine the gas generator serve. This will be the depth of the lower part to the diameter of the gas generator fits that the holding part of the gas generator when locking The upper and lower part of the housing is jammed.

It is also possible not to have a separate lower housing part watch and the housing of the gas generator itself with the Equip locking elements for connection to the upper part. However, this has the disadvantage that conventional gas generators cannot be used without adaptation and the replacement of the Gas generator a complete removal of the airbag module demands. Furthermore, the gas outlet is often on one end of the gas generator. It is therefore usually an advantage if the gas generator is in a separate base is recorded. This as essentially gas-tight The lower part of the container then serves as the Collection and the targeted introduction of gas into the gas bag.

Preferably, the gas generated by the gas generator is over molded onto the first housing part or the holding part led diffuser into the gas bag. A middle regarding of the gas generator arranged chimney-like diffuser, the the gas mainly conducts upwards proven particularly suitable. Through this configuration the forces acting on the housing can be so far reduce that the housing is made of plastic. According to the invention, the weight of the airbag unit can thus be significantly reduced.  

To improve the inflation behavior can in the gas bag additionally, a fabric diffuser arranged in the middle hen. This is preferably from a fabric web formed on the long sides of the gas bag with this is sewn. This will increase the lateral inflation The gas bag is reached after it has been removed from the housing leaked. It is appropriate that the fabric diffuser also serves as flame protection. The fabric diffuser reduces the risk to you not in the normal Sitting position (out of position) occupants, from to be shot in the gas bag, considerably. For further The risk of shooting in the OOP case can be reduced the triggering threshold of the airbag in a manner known per se unit through appropriate sensors and / or module components be adjusted measures.

Depending on where the airbag module according to the invention is used the upper part of the housing (first part) is on it Top either open, through a fleece or paper cover closed, or it shows one through the Airbag to open the closure when inflated. The Closure is in a known manner in its surface structure to the area surrounding the installation of the Airbagmo adjusted duls. The design of the closure and the me mechanisms through which it opens when inflated are on are known and should not be described here in detail the.

For sidebags that are predominantly in a vehicle door or Armrest can be installed, as well as for the subsequent Installation is an open top housing or one easily destroyed by the inflating airbag Fleece cover particularly suitable. With passenger airbags  a closure adapted to the surroundings of the installation site provided that when inflating along predetermined tear lines through the gas bag is opened.

The airbag module according to the invention is advantageously so mounted that the gas bag on the first part or Holding part is attached, if necessary, the painting part the first or second part of the housing is inserted, the Gas generator is arranged in the second part and that first and second parts are locked together. The The gas bag can be used both before and after it is locked be folded into the first part.

When folding the gas bag before locking the Housing can optionally be a thin plastic ring that is connected to the housing via webs as a placeholder serve for the diffuser. This can be done during final assembly either remain in the airbag unit or after Insert the diffuser to be removed.

The two-part housing is still a special one simple adaptation of the airbag unit according to the invention the geometries of different vehicle types possible. Since the Dimensions of common gas generators usually may differ little from each other, the second part of the casing ses be manufactured as a standard component, and only the first Part is attached to the required gas bag and installation space adapted in the vehicle.

For fastening the airbag unit to a motor vehicle preferably serves the second part of the housing. This is expediently used as load-bearing and strength receiving module part trained and with appropriate Provide means for attachment.  

In a further preferred embodiment, the Airbag unit a securing part with which the two Parts of the housing when attached to a vehicle part additionally secured in its connected position become.

The securing part is preferably designed such that it over the interlocked parts of the housing is slidable. It is appropriate that the securing part when attaching the airbag unit to the vehicle part is fixed on the airbag unit. You can use ex holes may be provided in the securing part, with corresponding holes in a fastening element for fastening the airbag unit using a screw cover or rivets on the vehicle part.

The invention will hereinafter by the attached Figu ren are explained in more detail.

Show it:

Fig. 1 a cross section through an inventive Sidebagmodul;

Fig. 2a shows a longitudinal section through the Sidebagmodul of FIG. 1;

FIG. 2b shows a second longitudinal section through the Sidebagmodul of FIG. 1;

Figure 3a is an airbag for use in the Sidebagmodul according to Figures 1 and 2..;

FIG. 3b shows a section along AA in Fig. 3a;

FIG. 3c shows the set to a sheet Malte airbag of Figure 3a and 3b in cross-section.

Fig. 4 is a perspective view of Sidebagmoduls according to the invention prior to assembly:

Fig. 5 is a perspective view of Sidebagmoduls according to the invention after mounting;

Fig. Dul a section through a device for folding a gas bag in an inventive Sidebagmo 6a;

Fig. 6b crossed the section of Figure 6a after the first folding.

Fig. 6c the section of FIG 6a and b after folding.

Figure 7a is a view of a Beifahrerair invention bagmoduls from below.

FIG. 7b shows a section along AA in Fig. 7a;

Fig. 7c shows a section along BB in Fig. 7a;

Figure 7d is a perspective view of the passenger airbag module according to the invention before assembly.

Fig. 8 is a section through a further inventive passenger airbag module;

Fig. 9 is a perspective view of another OF INVENTION to the invention Sidebagmoduls prior to assembly;

Fig. 10, the Sidebagmodul of Fig. 9 after assembly.

Fig. 1 shows a suitable cross section through a sidebag module 1 with an airbag 2 and an essentially cylindrical gas generator 3 in a housing comprising a first part (upper part 4 ) and a second part (lower part 5 ), which consists of a glass fiber reinforced plastic. The upper part 4 is connected to the lower part 5 via not shown te locking elements 6 (see FIG. 2b).

The gas generator 3 is fixed in the lower part 5 of the housing by means of locking lugs 7 (see also FIGS . 2 and 4). The gas bag 2 , only partially shown, is accommodated in the upper part 4 . He is connected to a bracket 8 , which is fixed by means of hook 9 on the upper part 4 and th with its angled lateral Endabschnit 18 between the upper part 4 and the lower part 5 is clamped. The clamping effect also covers the edge of the airbag 2 , which is cut around the angled lateral Endab 18 of the holding plate 8 and the slots 14 (see FIG. 3a), which are penetrated by the hook 9 .

Fig. 2a shows a longitudinal section through that shown in Fig. 1 Sidebagmodul 1, wherein the airbag 2 sichtlichkeit of About is not shown for simplicity.

According to Fig. 2a of the housing Fixed To are attached to the upper part 4 supply elements 10 are 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 latching by locking lugs 7 still by an end portion with a smaller diameter 11 , which is inserted into a recess 12 from the lower part 5 .

The holding plate 8 used to fasten the gas bag 2 has an opening 13 through which the gas released by the gas generator 3 passes into the gas bag 2 .

In the longitudinal section according to FIG. 2b, which runs through the lateral latching lugs 7 for fixing the gas generator 3 , the latching elements 6 can also be seen, by means of which the upper part 4 . and lower part 5 are connected.

Fig. 3a shows an airbag 2 for the airbag module 1 according to FIGS. 1 and 2. At the rim of the inflation of the airbag 2 slots 14 are provided through which the fastening of the airbag 2 on the mounting plate 8, the hook 9 of the retaining plate 8 are guided .

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

Fig. 3c shows the airbag 2 attached to the holding plate 8 and wrapped around the edge of the holding sheet 8, wherein the integrally formed on the retaining plate 8 hooks have been passed through the slits 14 of the airbag 2 9 which are provided in the region of the inflation opening of the gas bag 2 .

In Figs. 4 and 5, the Sidebagmodul each show a perspective view of before and after the mounting of the module, chen to the easy mountability to verdeutli. The gas bag 2 is not shown in FIGS . 4 and 5 for reasons of clarity.

For assembly, the gas generator 3 with the Endab cut smaller diameter 11 is inserted into the recess 12 of the lower part 5 and thereby locked by means of the locking lugs 7 ver. On the other hand, the hooks 9 of the holding plate 8 are inserted into the slots 14 of the airbag 2 and then the holding plate 8 together with the airbag 2 is pushed into the upper part 4 up to its end position shown in FIGS . 1 and 2, the hooks 9 of the retaining plate 8 are placed on the upper part 4 . Furthermore, the gas bag 2 is folded directly into the upper part 4 of the housing.

Finally, the upper part 4 and the lower part 5 of the housing are locked by the latching elements 6 provided for this purpose. Here, the holding plate 8 with its angled lateral end portions 18 together with the gas bag 2 between the upper part 4 and the lower part 5 is clamped, see FIG. 1, on the basis of which it is also clear that when the gas bag 2 is unfolded, the clamping effect due to the forces acting in the clamping areas are increased. Because of these forces, the angled Endabschnit te 18 of the retaining plate 8 are pressed against stops 19 which are provided on the upper part 4 of the housing.

The fully assembled airbag module 1 is shown in FIG. 5.

The folding of an airbag 2 into the upper part 4 of an airbag module 1 according to the invention is schematically illustrated in FIGS . 6a to c. The BEFE on the holding part 8 Stigt gas bag 2 and the upper part 4 of the housing are 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 allows the gas bag 2 to be stowed in the upper part 4 .

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

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

The lower part 5 has an integrally formed kaminar term diffuser 20 , the opening 13 is directed upwards. This causes the gas bag 2 to be inflated when inflated, which reduces the load on the tissue and the housing. This means in particular that the upper part 4 is not burdened by the gas flow, so that it can be easily formed accordingly.

In addition, in order to improve the inflation behavior, a fabric diffuser 21 is provided, which is arranged centrally above the diffuser 20 in the gas bag 2 . The tissue diffuser 21 also serves as flame protection.

Fig. 7c shows a section through the passenger airbag module 1 from Fig. 7a along the line BB. Webs 22 can be seen here, which stably isolate the chimney-like diffuser 20 . Furthermore, the definition of the gas generator 3 is shown in the lower part 5 via a retaining ring 23 and a screw connection 24 . The retaining ring 23 also seals on the one hand the lower part 5 from the environment and on the other hand also compensates for manufacturing tolerances of the gas generator 3 .

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

At the top in Fig. 7d, the gas bag 2 with the tissue diffuser 21 is shown. In the lower area, the gas bag has 2 slots 14 through which the locking elements 6 of the upper part 4 can be guided.

The upper part 4 has lugs as locking elements 6 in a tapering area. In addition, 4 further lugs 6 are provided on the lower edge of the upper part, which are intended to prevent the upper part 4 from bending when the airbag 2 is inflated.

In the lower part 5 6 recesses for the lugs of the upper part 4 are formed as locking elements. The opening 13 for introducing the gas into the gas bag 2 is moved through the kaminar term diffuser 20 in the folded gas bag 2 . The gas generator 3 is festge via a retaining ring 23 and a screw connection 24 in the lower part 5 . For this purpose, it is inserted laterally into the lower part 5 with the preassembled retaining ring 23 and fastened by means of the screw connection 24 . As a result, the lower part 5 is closed to a substantially gas-tight container.

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

A further sidebag module according to the invention is shown in FIGS . 9 and 10. This module 1 has a housing with an upper part 4 for receiving an airbag not shown here and a lower part 5 for receiving a gas generator 3 . A holding plate 8 is provided for fixing the gas bag 2 to the housing, analogously to the embodiment in FIGS . 1 to 5. Laying down of the gas generator 3 in the lower part 5 are also arranged similar to the module illustrated in FIGS. 1 to 5 locking elements 7 and a recess 12 in the bottom part 5.

Fig. 9 shows the module 1 without an airbag before assembly and in Fig. 10 the fully assembled module 1 is Darge.

A securing part 25 is designed such that it can be pushed over the housing from below after the upper part 4 and lower part 5 have been locked. The securing member 25 has a fastener 26 by which it is fixed to the upper part 4 in the attachment of the assembled module 1 to a vehicle part by means of the present on the upper part 4 fasteners 10th While the attachment to the upper part 4 is carried out by the fastening elements 26 , the lower part 5 is gripped by two brackets 27 . Thus, the connection between the upper part 4 and lower part 5 is additionally secured by the locking elements 6 with the securing part 25 . The fasteners 10 and 26 in this embodiment have equally spaced holes 28 through 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 simple to assemble and inexpensive to manufacture because of the number of the required parts has been greatly reduced. Furthermore leads to the use of plastic for the housing a weight loss.  

Reference list

1

Airbag module

2nd

Gas bag

3rd

Gas generator

4th

Top

5

Lower part

6

Locking elements

7

Latches

8th

Bracket

9

hook

10th

Fastener

11

End section with a smaller diameter

12th

Recess

13

opening

14

Slits

18th

angled end section

19th

attack

20th

Diffuser

21

Fabric diffuser

22

web

23

Retaining ring

24th

Screw connection

25th

Safety part

26

Fastener

27

hanger

Claims (39)

1. Airbag unit, in particular sidebag or passenger air bag 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 interconnected parts, characterized in that the first part ( 4 ) and the second part ( 5 ) can be connected to one another by latching elements ( 6 ). 2. Airbag unit according to claim 1, characterized in that the first part ( 4 ) of the housing for receiving the gas bag ( 2 ) and the second part ( 5 ) is provided for receiving the gas generator ( 3 ). 3. Airbag unit according to claim 1 or 2, characterized in that the gas bag ( 2 ) between the first and the second part ( 4 , 5 ) is clamped. 4. Airbag unit according to one of claims 1 to 3, characterized in that the gas bag ( 2 ) on the first part ( 4 ) and / or the second part ( 5 ) is attached. 5. Airbag unit according to one of claims 1 to 3, characterized in that the gas bag ( 2 ) is attached to a holding part ( 8 ) which is positively fixed in the housing. 6. Airbag unit according to one of the preceding claims, characterized in that the gas bag ( 2 ) in the region of its injection opening has slots ( 14 ) through which it is fastened in the housing. 7. Airbag unit according to claim 6, characterized in that for fastening the gas bag ( 2 ) in the housing serve projections which pass through the slots ( 14 ). 8. Airbag unit according to one of the preceding claims, characterized in that the gas bag ( 2 ) is placed around the first part ( 4 ) in the region of its injection opening. 9. Airbag unit according to one of the preceding claims, characterized in that at least some of the Rastele elements ( 6 ) for connecting the first and second parts ( 4 , 5 ) form the projections for fastening the gas bag ( 2 ). 10. Airbag unit according to claim 5 and 7, characterized in that the projections on the holding part ( 8 ) are provided. 11. Airbag unit according to one of claims 5 to 10, characterized in that on the holding part ( 8 ) fastening means ( 9 ) for fixing it to the first and / or second part ( 4 , 5 ) of the housing are provided by on . 12. Airbag unit according to claim 11, characterized in that hooks are provided as fastening means ( 9 ). 13. Airbag unit according to one of claims 5 to 12, characterized in that the holding part ( 8 ) has at least one angled portion ( 18 ), the inter mediate between the first and the second part ( 4 , 5 ) of the housin ses is positively received . 14. Airbag unit according to claim 13, characterized in that the angled section ( 18 ) between the first and the second part ( 4 , 5 ) is clamped. 15. Airbag unit according to claim 13 or 14, characterized in that the angled portion ( 18 ) is associated with an impact ( 19 ) on the first and / or second part ( 4 , 5 ) of the housing, against which the angled portion due of the forces acting when the gas bag ( 2 ) is deployed. 16. Airbag unit according to one of claims 8 to 13, characterized in that the gas bag ( 2 ) in the region of its injection opening around the angled section ( 18 ) is laid around. 17. Airbag unit according to one of the preceding claims, characterized in that the gas is passed through a diffuser ( 20 ) in the gas bag ( 2 ). 18. Airbag unit according to claim 17, characterized in that the diffuser ( 20 ) is designed like a chimney. 19. Airbag unit according to claim 16 or 17, characterized in that the diffuser ( 20 ) is integrated in one piece in the second part ( 5 ). 20. Airbag unit according to one of claims 17 to 19, characterized in that a tissue diffuser ( 21 ) is provided in the gas bag ( 2 ). 21. Airbag unit according to claim 20, characterized in that the fabric diffuser ( 21 ) deflects the gas flowing from the diffuser ( 20 ) into the gas bag ( 2 ) transversely to the inflow direction. 22. Airbag unit according to one of claims 20 or 21, characterized in that the fabric diffuser ( 21 ) is formed by a fabric web sewn to the gas bag ( 2 ) only on the longitudinal sides of the gas bag. 23. Airbag unit according to one of claims 20 to 22, characterized in that the fabric diffuser is the same serves as flame protection. 24. Airbag unit according to one of the preceding claims, characterized in that the second part ( 5 ) for receiving the gas generator ( 3 ) represents a substantially gas-tight container. 25. Airbag unit according to one of the preceding claims, characterized in that the gas generator ( 3 ) on the second part ( 5 ) can be fixed. 26. Airbag unit according to one of the preceding claims, characterized in that the gas generator ( 3 ) by locking elements ( 7 ) and / or screw connections ( 24 ) on the second part ( 5 ) can be fixed. 27. Airbag unit according to one of the preceding claims, characterized in that an end portion of the gas generator ( 3 ) in a recess ( 12 ) of the second part ( 5 ) can be inserted. 28. Airbag unit according to one of the preceding claims, characterized in that the gas generator can be fixed on the second part by a retaining ring ( 23 ). 29. Airbag unit according to one of the preceding claims, characterized in that the first part ( 4 ) is closed by a fleece cover. 30. Airbag unit according to one of the preceding claims, characterized in that the first part ( 4 ) has a closure which is opened by the inflating gas bag ( 2 ). 31. 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. 32. Airbag unit according to one of claims 30 or 31, characterized in that as a plastic a glasfa server-reinforced plastic, especially polyamide, ver is applied. 33. Airbag unit according to one of the preceding claims, characterized in that a securing part ( 25 ), with which the two parts ( 4 , 5 ) of the housing are additionally secured in their connected position when fastening to a vehicle part, is provided. 34. Airbag unit according to claim 33, characterized in that the securing part ( 25 ) is designed such that it can be pushed over the mutually locked parts ( 4 , 5 ) of the housing. 35. Airbag unit according to claim 33 or 34, characterized in that the securing part ( 25 ) in the fastening supply of the airbag unit ( 1 ) to a vehicle part with means of fastening elements ( 26 ) on the airbag unit ( 1 ) can be fixed. 36. Airbag unit according to claim 35, characterized in that the securing part ( 25 ) has brackets ( 27 ) which engage around the lower part ( 5 ), and the fastening elements ( 26 ) fix the securing part ( 25 ) on the upper part ( 4 ). 37. Method of assembling an airbag unit 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 interconnected parts, characterized in that the first part ( 4 ) and the second Part ( 5 ) can be locked together. 38. The method according to claim 37, characterized in that

• a) the gas bag ( 2 ) is attached to the first part ( 4 ),
• b) the gas generator ( 3 ) in the second part ( 5 ) is net angeord and
• c) the first and second parts ( 4 , 5 ) are locked together.

39. The method according to claim 37, characterized in that

• a) the gas bag ( 2 ) is attached to a holding part ( 8 ),
• b) the holding part ( 8 ) is plugged onto the first or second part ( 4 , 5 ) of the housing,
• c) the gas generator ( 3 ) in the second part ( 5 ) is net angeord and
• d) the first and second parts ( 4 , 5 ) are locked together.