DE102017008379A1 - airbag module - Google Patents

Abstract

The invention relates to an airbag module comprising an airbag housing (7) having an airbag outlet opening (3), in which housing interior (39) a folded airbag (11) together with a gas generator (13) is arranged, the airbag housing (7) being a component composite made of a non-rigid flexible airbag Hüllelement (5), which limits the housing interior (39), and a compared to the Hüllelement (5) component-rigid structural part (1) which at least partially the airbag outlet opening (3) moves and to which the Hüllelement (5) is connected. According to the invention, the airbag module has at least one covering element (9) made of a flexible, flexible material, which covers the airbag outlet opening (3) at least partially, in particular completely and on the closed surface, and the gas bag (11) together with the gas generator (13) is secured in the housing interior (39). holds.

Description

The invention relates to an airbag module for a two-lane motor vehicle according to the preamble of claim 1.

Such an airbag module can be installed, for example, on the passenger side of a motor vehicle on the instrument panel. For this purpose, the airbag module has an airbag housing with an airbag outlet opening. In the housing interior a folded gas bag is arranged together with gas generator. The airbag housing is made in common practice from a deep-drawn and / or folded sheet material and / or plastic, resulting in a total high component weight of the airbag module. Such an airbag module is exemplified in DE 43 35 084 A1 or from the DE 101 10 654 A1 known.

In departure of it is from the DE 10 2014 016 746 B3 or from the DE 10 2014 016 745 B3 a generic airbag module is known in which the airbag housing a composite component of a pliable, flexible envelope element, which limits the housing interior, and a component part in comparison to the rigid component structural part (that is, for example, a steel board) formed, which moves the airbag exit opening frame-shaped and on the wrapping element is connected as a tissue loop. The steel board can be integrally formed, for example, by a pressing and / or bending operation and can perform the following functions, namely the module attachment to the instrument carrier, a generator receiving / attaching, a tissue wrapping / fastening as well a stabilization of the airbag against the vehicle-side loads during vehicle life (acceleration and deceleration in all directions). Furthermore, when the airbag is deployed, the board must absorb the forces coming from the inflator and from the airbag deployment.

In the above mentioned DE 10 2014 016 746 B3 has the steel board (that is, the frame-shaped structural component structural part) a generator-side frame strip to which the gas generator is connected, and a far generator frame strip, which is spaced with the interposition of the airbag outlet opening of the generator side frame strip and is arranged parallel thereto. The pliable, flexible sheath element (that is, the tissue loop) can be attached to the two frame strips and clamped between the two frame strips, to form the housing interior.

In the above DE 10 2014 016 746 B3 as well as in the DE 10 2014 016 745 B3 the folded airbag arranged in the pocket-shaped enveloping element is exposed upwards in the direction of the airbag. The folded airbag is to be positioned in the pocket-shaped enveloping element such that during normal driving operation during acceleration / deceleration in all axial directions, the airbag module, in particular its collapsed airbag, remains stably positioned to ensure proper functioning.

The object of the invention is to provide an airbag module in which such a stable, positionally secure positioning of the airbag module, in particular its folded airbag, is ensured in a simple manner.

The object is solved by the features of claim 1. Preferred embodiments of the invention are disclosed in the subclaims.

According to the characterizing part of claim 1, the gas bag folded up in the airbag housing is no longer completely exposed upwards, but rather has the airbag module at least one cover element which consists of a pliable, flexible material (such as a fabric, fabric and / or textile web or The like) is produced and the airbag outlet opening at least partially covered in order to keep the folded gas bag together with the gas generator positionally secure in the airbag module. Preferably, the cover is a large-scale and closed-area material blank that completely covers the airbag exit opening. In order to ensure the functionality of the airbag module, the cover may have a predetermined breaking point, which ruptures in an airbag deployment and thereby releases the airbag outlet opening.

In a technical implementation, the component-rigid structural part can be constructed frame-shaped, with a generator-side frame strip to which the gas generator is connected, and a far generator frame strip, which is spaced from the generator-side frame strip with the interposition of the airbag outlet opening and is arranged parallel thereto. In this case, the enveloping element can be attached to both frame strips and, while forming the housing interior, the two frame strips can be bridged together on the bottom side. In contrast, the cover spans the airbag outlet opening at a distance from the enveloping element on the deck side.

The cover element can preferably be connected to a generator-side connection point in the area of the generator-side frame strip and attached to a generator-remote connection point in the region of the frame strip remote from the generator. Especially at the generator remote Anbindungsstelle, the cover firmly, that is not destructively releasable, be directly connected to the enveloping element, and preferably be sewn so. In this way, a one-piece structural unit, consisting of the enveloping element and the cover. The far generator connection point is preferably positioned on an inside of the housing enclosing the housing interior and thereby protected from external mechanical influences.

In contrast to the above generator remote connection point, the cover can be connected to the generator-side connection point releasably connected to the generator side frame strip to ensure a simple airbag module assembly. The above releasable connection is realized in particular as follows: Thus, the cover member may have at least one opening or recess, with which the cover is hooked without tools in a corresponding hook contour on the generator side frame rail.

In a preferred embodiment, the folded airbag can, viewed in the direction of the airbag exit direction, project beyond the structural part of the airbag housing that is part of the component so as to project beyond an airbag overhang. When the cover element is loosened, the airbag projection can project beyond the structural part by a first height. In contrast, the folded airbag can be detachably connected to the cover element mounted on the generator frame in the case of end-mounted cover element under gas bag compression and with simultaneous construction of a pretensioning force. When endmontiertem cover, a reduced compared to the first height height of the airbag supernatant can be adjusted. In the above constellation, therefore, results in a biased with the biasing force on the airbag outlet opening cover.

In order to ensure a simple assembly of the cover, it is preferred if the cover at its generator-side connection point remote from the airbag outlet opening outer edge of the generator-side frame strip surrounds and in particular a frame bar bottom is releasably attached (that is mounted). In this way, results between the airbag supernatant and the generator-side frame strip a Inneneckbereich, which is covered by the cover. Preferably, a mounting element, for example a nut or the like, be arranged for attachment of the gas generator to the generator-side frame strip in the inner corner region and thus be shielded to the outside.

Preferably, the gas generator can be screwed via two screw connections on the underside of the generator-side frame strip of the structural part. For this purpose, the generator-side frame strip having a substantially closed-surface mounting portion having two spaced screw holes, via which the gas generator can be screwed to the frame strip bottom. Preferably, the mounting portion of the generator-side frame strip is formed with a recess which is positioned in alignment between the two screw holes. By means of the recess, the gas generator can be exposed viewed in the direction of the airbag exit direction. In this way, when the airbag module is activated, an outflow cross section of the gas generator in the direction of the airbag exit direction is increased, which is advantageous with regard to the airbag deployment.

With regard to an increased dimensional stability of the component-rigid structural part of the airbag housing, the generator-side frame strip and the frame strip remote from the generator can be connected to one another by forming a closed frame by means of lateral frame strips. These may preferably act as Modulanschraubflansche to attach the airbag housing with a corresponding terminal contour of an instrument panel. Preferably, the lateral frame strips (ie Modulanschraubflansche) have angled boundary tabs that limit the folded gas bag laterally to keep screw-on points on the side frame strips (ie Modulanschraubflansche). Alternatively and / or additionally, the lateral frame strips may have guide walls which protrude counter to the direction of the airbag exit. The guide walls may have bottom side guide edges, around which extends the spanned between the generator side and generator frame strip frame enveloping element, whereby a Hüllelement contour curve is fixed.

Hereinafter, embodiments of the invention are described with reference to the accompanying figures.

• 1 in einer perspektivischen Darstellung ein Airbagmodul im zusammengebauten Zustand;
• 2 eine Schnittdarstellung entlang der Schnittebene A-A aus der 1;
• 3 eine Ansicht entsprechend der 2 bei noch geöffnetem Abdeckelement;
• 4 in einer perspektivischen Darstellung das rahmenförmige bauteilsteife Strukturteil des Airbaggehäuses mit daran verschraubtem Gasgenerator, wobei die Gasgenerator-Bolzen, die Muttern sowie das Hüllelement und das Abdeckelement weggelassen sind;
• 5 und 6 jeweils unterschiedliche Profilierungen der generatorfernen Rahmenleiste des rahmenförmigen Strukturteils;
• 7 bis 9 jeweils unterschiedliche Ausführungsvarianten des rahmenförmigen, bauteilsteifen Strukturteils des Airbaggehäuses.

Show it:

• 1 in a perspective view of an airbag module in the assembled state;
• 2 a sectional view along the sectional plane AA from the 1 ;
• 3 a view corresponding to the 2 with the cover still open;
• 4 in a perspective view of the frame-shaped component-rigid structural part of the airbag housing with gas generator screwed thereto, wherein the gas generator bolts, the nuts and the enveloping element and the cover are omitted;
• 5 and 6 in each case different profiles of the generator-distant frame strip of the frame-shaped structural part;
• 7 to 9 respectively different embodiments of the frame-shaped, component-rigid structural part of the airbag housing.

In the 1 an airbag module is shown in the assembled state. The airbag module has a frame-shaped component-rigid structural part 1 on, that is an airbag outlet opening 3 ( 2 or 3 ) moves. On the frame-shaped structural part 1 is a bag-shaped wrapping element 5 made of a limp, flexible material connected, which together with the frame-shaped structural part 1 an airbag housing 7 forms. The top of the airbag housing 7 is in the 1 from an additional cover element 9 covered, which is also formed of a pliable, flexible material. In the pocket-shaped enveloping element 5 is according to the 2 a folded gas bag 11 together with gas generator 13 arranged.

The frame-shaped structural part 1 of the airbag housing 7 has a generator-side frame bar 15 as well as a generator frame bar 17 on, with the interposition of the airbag outlet opening 3 from the generator side frame bar 15 is spaced and parallel to this runs. The two frame strips 15 . 17 are connected via lateral frame strips (hereinafter also referred to as Modulanschraubflansche) 19 with each other. On the side frame rails 19 are in the 1 three screw holes 21 recognizable, via which the airbag module can be screwed to a corresponding connection contour of an instrument panel. Like from the 2 further, is the gas generator 13 on the underside of a mounting section 23 the gas generator side frame strip 15 tethered. For this purpose, the gas generator 13 two bolts 25 on through the corresponding screw holes 27 of the mounting section 23 are guided and the upper side of the generator-side frame strip 15 with a nut 29 are bolted. The gas generator 13 is in common practice within the folded airbag 11 positioned, with its bolt 25 through airbag openings 31 of the gas bag 11 are guided.

Like from the 2 shows, is the envelope element 5 double-layered, with an inner layer 33 , which is attached to a frame border around the housing 17 wrapped loop 34 in an outer layer 35 passes. The free ends of the inner and outer layer 33 . 35 are superimposed and have recesses which are in alignment with the gas bag side recess and through which also the bolt 25 is guided to the inner and outer layers 33 . 35 between the gas generator 13 and the generator-side frame bar 15 pinch. The double-layered wrapping element 5 limits a housing interior 39 which the folded gas bag 11 together with the gas generator 13 is arranged. The folded gas bag 11 projects beyond the frame-shaped structural part 1 with a gas bag overhang 41 ,

According to the 2 the cover element extends 9 between a non-generator connection point A1 and a generator-side connection point A2 , The cover element 9 is with a predetermined tear S formed in an airbag deployment with release of the airbag 11 tears. At the generator remote connection point A1 is the cover element 9 non-destructive non-detachable with the inner layer 33 of the double-layered wrapping element 5 sewed, at one of the housing interior 39 bounding inside of the Hüllelement-inner layer 33 , In contrast to generator remote connection point A1 is the cover element 9 at the generator-side connection point A2 not insoluble, but rather solvable with the generator-side frame strip 17 connected. For this purpose, the cover member 9 at its free end a total of three recesses 43 on (in the 3 is just one of the recesses 43 shown), by means of which the cover 9 in a down-projecting hook contour 45 the generator-side frame strip 15 can be hung. For this purpose, the cover surrounds 9 in the 2 one of the airbag exit opening 3 opposite outer edge 47 the generator-side frame strip 17 , which creates an inside corner area 49 between the gas bag supernatant 41 and the top of the generator-side frame strip 17 results from the cover 9 is overstretched. The nut 29 for fastening the gas generator 13 is in the 2 shielded from the outside in the inner corner area 49 positioned.

In the 3 is the airbag module with still solved cover 9 shown. In this partially assembled state, the gas bag protrusion protrudes 41 the frame-shaped structural part 1 around a first height h ₁ , which are even larger than the aforementioned second height h ₂ is. For final assembly, the cover is 9 with its end around the outer edge 47 the generator-side frame strip 15 guided and at the hook contour 45 hooked. This takes place under compression of the gas bag 11 , with simultaneous construction of a biasing force acting on the cover 9 acts, resulting in a comparison to the first height h ₂ reduced second height h _{2 of} the gas bag supernatant 41 results.

The following are based on the 4 to 9 relevant detail aspects of the frame-shaped structural part 1 described: So is in the 4 the mounting section 23 with a recess 51 trained to escape between the two screw holes 27 is arranged. By means of the recess 51 is a gas outflow area 53 of the gas generator 13 exposed in the airbag exit direction upwards, whereby a deployment process of the airbag 11 can be accelerated.

It should also be stressed that in the 4 the screw holes 27 for the gas generator 13 longitudinally aligned with the bolt holes 21 for the module connection to the instrument panel carrier to a short power / travel distance to the Modulanschraubpunkten 21 to realize. Like from the 2 in conjunction with the 4 further shows, are the gas generator bolts 25 ( 3 ) in the firing channel. To realize the largest possible airbag package, the gas generator 13 placed on the module side wall and the attachment up to the board.

Further, in the frame-shaped structural part 1 (Not shown in detail) profile designs and / or stampings provided to keep the expansion of the board to a minimum. By way of example, the inner edge may be circumferentially bent over (for greater rigidity at the radii).

In the 5 and 6 are different profiles of the generator frame strip 17 represented: so in the 5 the generator-distant frame bar 17 a closed rectangular hollow section on, while in the 6 the generator-distant frame bar 17 has a closed triangular hollow profile. In the 7 are in the area of the assembly section 23 the generator-side frame strip 15 at the inner edge upwardly angled shielding tabs 53 formed the gas bag fabric from the nuts 29 space the generator attachment. In addition, the side frame rails have 19 (ie the Modulanschraubflansche) at their inner edges in each case upwardly and downwardly angled boundary straps 55 on top of the folded gas bag 11 limit sideways to the screw holes 41 for connection to the instrument panel.

In the 9 have the two side frame strips 19 each angled guide walls 57 on. In the assembled state, the two inner and outer layers 33 . 35 of the enveloping element 5 around the bottom guide edges 59 the guide walls 57 guided to the contour of the envelope element 5 set.

As an alternative to the preceding figures, the component-rigid frame-shaped structural part 1 (With a view to a weight reduction) may also be formed of different materials, for example as an at least partially plastic-coated steel plate, the gas generator 13 for example stabilized / fixed on one side with at least one attachment point of the module to the instrument panel. The goal is always to create a stable gas generator / instrument panel connection (earthing). In a first variant, a narrow metal strip from the two-sided Modulanschraubpunkten 21 via the gas generator attachment points 27 walk. At the metal strip may be injection molded a plastic structural element. In a second variant, only one gas generator attachment point 27 with a Modulanschraubpunkt 21 be connected by a metal strip (for a gas generator grounding). The remaining parts of the frame-shaped structural part 1 can be injection molded from plastic.

In the 8th is a further embodiment of the component-rigid frame-shaped structural part 1 shown here in a mixed construction as a composite component of a sheet material 63 and a plastic material 61 , For example, a fiber composite plastic produced. Consequently, in the 8th the generator-side frame strip 15 with the outside plastic material 61 made in which a narrow sheet metal strip 63 is integrally integrated. In the narrow metal strip 63 are the two screw holes 27 educated. The side frame rails 19 as well as far generator frame border 17 are in the 8th In contrast, completely made of plastic material 61 manufactured. In contrast to 8th may possibly only a greatly shortened metal strip in the plastic material 61 be poured, the only one screw hole 27 for screwing the gas generator 13 having.

LIST OF REFERENCE NUMBERS

1

frame-shaped structural part

3

Airbag exit opening

5

sheath member

7

airbag housing

9

cover

11

airbag

13

inflator

15

Generator-side frame strip

17

generator frame border

19

side frame rails

21

screw

23

mounting portion

25

bolts

27

screw

29

nut

31

airbag opening

33

inner layer

34

loop

35

backsheet

39

Housing interior

41

Airbag supernatant

43

Recess (fixing opening for the cover element)

45

hook contour

47

outer edge

49

inner corner

51

recess

53

shield

55

mounting tab

57

guide walls

59

Leading edges (package boundary in side direction)

61

Plastic material

63

metal strip

A1

generator remote connection point

A2

Generator-side connection point

S

Predetermined tearing point

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 4335084 A1 [0002]
• DE 10110654 A1 [0002]
• DE 102014016746 B3 [0003, 0004, 0005]
• DE 102014016745 B3 [0003, 0005]

Claims (10)

Airbag module having an airbag housing (7) having an airbag outlet opening (3), in the interior of the housing (39) a folded airbag (11) together with a gas generator (13) is arranged, the airbag housing (7) being a composite component of a flexible flexible envelope element (5) , which delimits the housing interior (39), and a structural part (1) which is rigid relative to the envelope element (5) and which at least partially encloses the airbag outlet opening (3) and to which the envelope element (5) is connected, characterized in that Airbag module has at least one cover (9) made of a pliable, flexible material, the airbag outlet opening (3) at least partially, in particular completely and closed surface, covered and keeps the gas bag (11) together with the gas generator (13) in the housing interior (39). Airbag module after Claim 1 , characterized in that the cover (9) has a predetermined breaking point (S) which ruptures in an airbag deployment with release of the airbag outlet opening (3). Airbag module after Claim 1 or 2 , characterized in that the structural part (1) is constructed like a frame and a generator side frame strip (15) to which the gas generator (13) is connected, and a generator frame strip (17) remote generator, the interposition of the airbag outlet opening (3) of the generator-side frame strip (15) is spaced and is arranged parallel thereto, and that in particular the enveloping element (5) on both frame strips (15, 17) is connected and forming the housing interior (39) spans the two frame strips (15, 17) on the bottom side, while the cover (9) the cover exits the airbag outlet opening (3), and / or that the enveloping element (5) on the generator side frame strip (15) is screwed and the generator frame strip remote (17) from the enveloping element (5) is looped. Airbag module after Claim 3 Characterized in that the cover (9) to a generator-side connecting point (A2) is connected in the region of the generator-side frame strip (15), and that the cover (9) on a generator remote connection point (A1) in the region of the generator distant frame strip (17) is connected, and that in particular at the far generator connection point (A1), the cover (9) fixed, that is non-destructive non-releasably connected to the enveloping element (5), in particular sewn thereto, to form a one-piece unit consisting of the Enveloping element (5) and the cover (9). Airbag module after Claim 4 , characterized in that at the generator-side connection point (A2), the cover element (9) is detachably connectable to the generator-side frame strip (15), and in particular that the cover element (9) has at least one recess (43), with which the cover element (9 ) in a hook contour (45) on the generator-side frame strip (15) can be suspended. Airbag module after Claim 5 , characterized in that the folded gas bag (11) with dissolved cover (9) with a gas bag projection (41) the structural part (1) by a first height (h ₁ ) in the airbag exit direction (3) surmounted, and / or the folded gas bag (11) at the endmontiertem cover (9) under compression of the gas bag (11) and with simultaneous construction of a biasing force (F _v ) on the generator side frame strip (15) is detachably connected, with a comparison with the first height ( h ₁ ) reduced second height (h ₂ ) of the gas bag supernatant (41). Airbag module after Claim 5 or 6 , characterized in that the cover element (9) at its generator-side connection point (A2) facing away from the airbag outlet opening (3) outer edge (47) of the generator side frame strip (15) engages and in particular on a bottom of the frame strip (15) is releasably attached, namely, forming an inner corner region (49) between the gas bag projection (41) and the generator side frame strip (15), which is covered by the cover (9), and in particular a mounting element, such as a nut (29), for attachment of the gas generator (13) on the generator-side frame strip (15) in the inner corner region (49) is arranged. Airbag module according to one of Claims 3 to 7 , characterized in that the generator-side frame strip (15) has a mounting portion with two spaced screw holes (27) via which the gas generator (13) to the underside of the generator side frame strip (15) can be screwed, and that the mounting portion (23) a recess (51) in alignment between the two screw holes (27) is formed, by means of which the gas generator (13) is exposed in the airbag exit direction. Airbag module according to one of Claims 3 to 8th , characterized in that the generator-side frame strip (15) and the generator-distant frame strip (17) to form a closed frame side frame strips (19) which connect the generator-side frame strip (17) together, and in particular that the lateral frame strips (19) angled limiting tabs (55) which laterally delimit the folded gas bag (11) in order to keep connection points free on the lateral frame strips (19), and / or that screening tabs (53) are formed on the generator-side frame strip (15), which cover the gas bag fabric the generator attachment (29) spaced. Airbag module after Claim 9 , characterized in that for defining a contour of the Hüllelements (5), the lateral frame strips (19) guide walls (57) to which the between the generator side frame strip (15) and the far generator frame strip (17) spanned enveloping elements (5).

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