Bag-in-bag safety restraint with secure inflation

Abstract

Airbag system for deployment from a structural element of a vehicle, comprising: a gas generator (55) that provides inflation gas in response to an activation signal, a main bag (65) in a folded state configured to be stored in an inner area behind a liner of the structural element, the main bag (65) having a distal end (66) configured to tear open a rip seam (53) in the liner, and a shielding bag (120) arranged above the gas generator (55) and having a projection body (121) extending away from the gas generator (55) to a remote edge within the main bag (65), wherein the projection body (121), Apart from at least one gas passage (122) at the remote edge for connecting inflation gas from the gas generator (55) to the main bag (65), is substantially continuous in the direction of the main bag (65), wherein the main bag (65) has a fold near the gas passage (122) so that the inflation of the main bag (65) begins with the fold being unfolded in such a way that the main bag (65) is displaced towards the tear seam (53), wherein the shielding bag (120) has a back fold (123) and a tab (124, 125) arranged on the projection body (121) and wherein the shielding bag (120) extends in a direction towards the tear seam (53) by inflating the tab (124, 125).

Description

[0001] The present invention relates generally to inflatable airbag safety restraint devices and specifically to a side airbag that can be deployed from a passenger seat.

[0002] Vehicle airbags protect vehicle occupants in a collision, such as when the vehicle rolls over or collides with a pole or another vehicle. Traditionally, airbags were initially located in the steering wheel and on the dashboard in front of the passenger for protection in frontal collisions. Later, side-impact airbags were developed, which deploy between an occupant and a side of the vehicle (e.g., a door, B-pillar, or side window). One type of airbag is mounted inside a passenger seat and configured to rapidly deploy from the seat into the space between the passenger and the side of the vehicle. With such a seat-mounted airbag, the expansion of the inflating airbag within the seat can be used to tear open a seam in a seat cover, allowing the airbag to protrude into the desired space.

[0003] Deploying a side airbag quickly enough into the gap between the passenger and the inner surface of the vehicle side (e.g., the door) is very difficult, 1) due to the smaller initial space between the passenger and the side of the vehicle, and 2) because there is less crushing space at the side of the vehicle, meaning that in a collision, the side structure impacts the gap sooner. The airbag must inflate forcefully enough to rupture the seam of the seat cover and quickly deploy the bag. For this reason, a relatively higher inflation pressure and gas flow rate are required. However, these higher forces make it more difficult to ensure that the airbag deployment is directed appropriately.For example, the natural tendency of an inflating airbag to expand in all directions can be undesirable in the case of a seat-mounted airbag because it is critical that a tear seam in the seat cover ruptures early during airbag deployment, allowing the airbag to expand to the desired area to protect the passenger (i.e., instead of extending into other areas of the seat or inflating the seat in an undesirable way). In known seat-mounted side airbags, various additional structures have been employed to direct the forces and direction of airbag expansion toward the tear seam, using a launch channel, a double-shell casing, force concentrator straps, seat foam reinforcements, and other supplementary structures. It would be desirable to ensure airbag expansion in the necessary direction without the additional cost of such supplementary structures.

[0004] For the state of the art, reference is made to EP 2 810 831 A1 and DE 201 06 598 U1.

[0005] Consequently, the present invention aims to provide an improved airbag system or passenger vehicle compared to the prior art.

[0006] This task is solved using the objects of independent claims. BRIEF SUMMARY OF THE INVENTION

[0007] To protect the fabric of the main airbag from hot gases and particles, it is typically shielded from the direct outflow of gas from the gas generator by a shield arranged around the gas generator's outlet holes. The shield can comprise plastic or metal shields, or alternatively, a cylindrical cover band made of heavy-duty fabric that is heat- and particle-resistant (often referred to as a calzone). A conventional calzone is designed as a fabric cylinder or tube with an open end that covers the gas generator. According to the present invention, the ends of a calzone are closed, creating a double-bag structure (bag within a bag). A projection body or...A wing is added, and one or more openings can be formed at the remote end of the protruding body to direct the gas flow so that it enters the outer main airbag at a remote inflation point located away from the gas generator. The opening location and configuration of the main airbag can be selected to ensure rapid inflation and pressurization of the calzone shielding bag, thus providing a rigid, stable structure for controlling the deployment of the main airbag. Thanks to the structure according to the invention, the main airbag can deploy from the front of a bag-pack instead of from the location of the gas generator, thereby ensuring better concentration of the bag's energy on the seat trim opening seam and a faster, more decisive opening of the seam.The expansion of the calzone shielding bag allows for controlled preloading of the seat side panel, resulting in a more stable bag deployment. In addition to cost reduction by eliminating the need for other countermeasures to control airbag inflation (e.g., a launch channel or a double shell), a slimmer airbag pack also allows for improved passenger seat design. The invention is compatible with many main airbag folding designs, including, but not limited to, inner or outer rolls, single or double rolls, compression folds, plus-one side or longitudinal folds, and Z-folds. Rolls can be offset to create a flatter / thinner bag pack or to achieve a favorable deployment sequence. Besides heavy-duty fabric, the calzone shielding bag can be made of molded plastic, stamped metals, or other materials.The calzone shield bag can be angled, tilted, folded, or secured in various ways to direct the deployment of the main airbag toward an opening seam or to improve out-of-position (OOP) performance. Specific vents can be provided at the far end of the calzone shield bag and configured to direct a stronger gas flow to certain vertical areas of the main airbag, resulting in faster deployment or locally higher bag pressure in specific areas such as the passenger's hips. Ties can be used within the calzone shield bag to help control its shape when pressurized.

[0008] The present invention can provide a method for improving gas flow for the next generation of "slim," flat-packed side airbags to increase deployment stability and protect the more densely packed "bag folds" used. It can provide the ability to specifically design an initial deployment vector and to "preload" the trim by aligning the side and longitudinal components of an "L-fold" or by positioning the calzone in an angled, oblique, or folded state within the main airbag pack to help deploy the bag outward toward the seat trim opening seam and / or improve out-of-probability (OOP) performance.

[0009] The calzone according to the invention can allow an airbag to be packed on one side or the other, thus providing a "double deployment front" that improves speed. In cases of expansion restrictions (e.g., due to a closing gap or out-of-probability considerations), the present disclosure allows for an equalization or exchange of bag pressure between two deploying bag sections, whereby 1) one bag section can better enter a shrinking space and then pull the second bag section into the gap, and / or 2) the stress on an out-of-probability occupant is reduced by providing a second bag deployment path.

[0010] In a primary aspect of the invention, an airbag system deploys from a structural element of a vehicle. A gas generator can provide inflation gas in response to an activation signal. A main bag can be configured to be stored in a folded state in an inner region behind a cover of the structural element, the main bag having a distal end configured to rupture a tear seam in the cover. A shielding bag can be arranged above the gas generator and have a projection extending from the gas generator to a remote edge within the main bag. The projection can be substantially continuous in the direction of the main bag, except for at least one gas passage at the remote edge for connecting inflation gas from the gas generator to the main bag.The main bag may have a fold near the gas passage, so that the inflation of the main bag begins by unfolding the fold in such a way that the main bag is shifted towards the tear seam.

[0011] The shielding bag may have a back pleat and a flap arranged on the projection body, such that, when the flap is inflated, the shielding bag expands in one direction towards the tear seam. The flap may be positioned over and near the gas passage before inflation. The shielding bag may further include an internal attachment within the projection body to limit the width of the shielding bag's expansion.

[0012] According to another aspect of the present invention, an airbag system is provided which deploys from a structural element of a vehicle and comprises: a gas generator which provides inflation gas in response to an activation signal; a main bag in a folded state which is configured to be stored in an inner area behind a liner of the structural element, wherein the main bag has a distal end which is configured to tear open a rip seam in the liner; and a shielding bag which is arranged above the gas generator and has a projection body which extends away from the gas generator, wherein the shielding bag has a backfold and a flap which are arranged on the projection body, wherein the projection body has at least one gas passage covered by the flap for connecting inflation gas from the gas generator to the main bag.wherein the main bag has a fold near the gas passage, so that the inflation of the main bag begins with the fold being unfolded in such a way that the main bag is shifted towards the tear seam.

[0013] The back fold can create an upper flap and a lower flap on opposite sides of the protrusion body. The shielding bag can further include an internal connection within the protrusion body to limit the expansion width of the shielding bag. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a horizontal cross-section of a seat-mounted side airbag from the prior art. Fig. 2 and Fig. 3 are cross-sections showing the airbag from Fig. 1 during the initial or intermediate stage of development. Fig. Figure 4 is a perspective view of a gas generator within a fabric shield from the prior art. Fig. Figure 5 is a perspective view of a gas generator inside a shielding bag according to the invention. Fig. Figure 6 is a horizontal cross-section of a side airbag mounted on a seat according to a first embodiment of the invention with a shielding bag having a single protruding body. Fig. Figures 7-9 are cross-sections showing the airbag. Fig. 6 in successive stages of development. Fig. Figure 10 is a horizontal cross-section of a seat-mounted, undeployed side airbag according to a second embodiment of the invention with a shielding bag having dual protrusion bodies. Fig. Figure 11 is a horizontal cross-section of the airbag made of Fig. 10 in an unfolded state. Fig. Figure 12 is a horizontal cross-section of a seat-mounted side airbag according to a third embodiment with a shielding bag having an L-fold. Fig. Figure 13 is a horizontal cross-section of a side airbag mounted on a seat according to a fourth embodiment of the invention with a shielding bag having back folds and an intermediate connection. Fig. Figure 14 is a cross-section with a more detailed representation of the shielding bag. Fig. 15 and Fig. 16 are cross-sections showing the airbag from Fig. 13 in successive stages of development. DETAILED DESCRIPTION OF PREFERRED EXECUTION FORMS

[0014] Fig. Figure 1 is a horizontal cross-section of a section of a passenger seat in which a conventional side airbag is used. A seat 10 has an inner foam body 11 with an outer cover 12. An inner cavity 13 formed in the foam 11 has a seat frame element 14 which supports an airbag device (or an airbag module) 15 via a bracket 16. A vertical tear seam 17 is preferably sewn through the cover 12 and an airbag deployment channel 18, which provides reinforcement around the airbag module 15 and helps to direct energy from airbag inflation to the tear seam 17. The deployment channel 18 is preferably made of nylon and has a closure 19 at one end and open flaps 20 and 21 that are sewn together in the tear seam 17. The airbag module 15 has a gas generator 22 for inflating a main bag 23.A shield 24 protects the main bag 23 from hot gases that flow through an outer cover 25 of the airbag module 15 during inflation to expand the main bag 23.

[0015] Fig. Figure 2 shows the initial stages of the inflation of the airbag 23, with a door 26 opening in the airbag module 15 and the airbag 23 pushing forward into the seam 17 to tear apart the sewn elements as the airbag 23 moves outwards. Fig. Figure 3 shows the final stages of inflation, with the airbag 23 assuming a desired position between a passenger and a vehicle door (not shown). In this prior art, special structures in the form of the firing channel and / or reinforcement of the airbag module are necessary to ensure sufficiently rigid reaction surfaces that prevent backward movement of the deploying airbag. Consequently, deployment energy is directed to the seat trim tear seam and beyond into the space where the airbag is inflated.

[0016] Fig. Figure 4 is a perspective view showing a gas generator 30 covered by a known shielding bag or calzone 31 with open ends 32 and 33. In the bag-in-bag system according to the invention, the shielding bag 31 protects an outer main bag (not shown) from hot gases and particles escaping from the radial surface of the gas generator 30. The inflation gases are connected to the main bag through the axial openings 32 and 33. In an application with a seat-mounted side airbag, it may be desirable to supply inflation gas from the longitudinal ends of the shielding bag 31 so that the hip and chest areas of the main bag can be inflated first.

[0017] Fig. Figure 5 shows a modified shielding bag 35 for holding the gas generator 30 according to the invention. The shielding bag 35 has a substantially cylindrical end 36 for receiving the gas generator 30 and a projection 37 extending from the section 36 to a remote edge 38, such that the projection 37 forms a wing arranged within a main bag (not shown). The shielding bag 35 has a closed upper edge 40 and a closed lower edge 41 to receive the inflation gas from the gas generator 30, preventing it from entering the main bag by flowing coaxially along the gas generator 30. Instead, one or more gas passages 42 and / or 43 are provided at the remote edge 38 to connect inflation gas from the gas generator 30 to the main airbag. The projection 37 is substantially continuous (i.e.,(sealed), when it enters the main bag, so that the inflation of the main bag occurs at a location remote from the gas generator 30. Specifically, the inflation is carried out such that the folded bag is essentially pulled away from the gas generator 30 and towards the tear seam, rather than simply pushed in as in the prior art. Gas passages or openings 42 and 43 are shown at the upper and lower intersections of the remote edge 38 with the upper and lower edges 40 and 41 to direct the expansion of the main bag, if desired, towards the chest and / or hip regions. If desired, additional gas passages can be added along the remote edge 38, as shown at 44 and 45.

[0018] Fig. Figure 6 is a horizontal cross-section through a section of a seat 50 containing an airbag system according to the invention. The seat 50 has an internal foam seat body 51 covered with a cover layer 52 that defines a tear seam 53. The foam body 51 has a cavity 54 in which a side airbag device is installed, comprising a gas generator 55 with a gas generator mounting boss 56 for attachment to a bracket or frame (not shown). The side airbag system can be enclosed in a soft packaging envelope or packing tape 57 using a conventional material such as Tyvek. Compared to the reinforced firing channel or other prior art structures, a soft packaging envelope or tape can be cost-effective. A shielding bag 60 is mounted over the gas generator 55 and has a projecting body 61 with a gas passage 62 at the remote edge.A main bag 65 is mounted over and contains the shielding bag 60. The main bag 65 can be continuous over the gas generator 55 and the shielding bag 60, as shown, or alternatively, it can be connected to the shielding bag 60 in such a way that it only fully contains the protruding body 61. The main bag 65 is configured in an uninflated, folded state for storage in the cavity 54, such that a distal end 66 of the main bag 65 tears open the rupture seam 53 when inflated.

[0019] The main bag is configured to have a fold near the gas passage 62 of the shielding bag 60, so that inflation of the main bag 65 begins with the fold unfolding in such a way that the main bag 65 is displaced towards the tear seam 53, as described in more detail below. The gas generator responds to an activation signal from a restraint control (not shown), which depends on an accelerometer or other impact sensor (not shown). As in Fig. As shown in Figure 6, the projecting body 61 has an upper planar surface 70. The main bag 65 has a first rolled section 71 arranged laterally on the planar surface 70. The projecting body 61 has a lower planar surface 72, and the main bag 65 has a second rolled section 73 arranged laterally on the planar surface 72. In this embodiment, the rolled sections 71 and 73 are shown as inner and outer rolls, which, when inflated at the gas passage 62, as shown in Figure 6, Fig. As shown in Figure 7, the main bag 65 begins to roll up in a direction away from the gas generator 55 and towards the seam 53. Thus, an inflation gas 75 begins to fill the protruding body 61 and exits from the gas passage 62 to enter the rolled sections 71 and 73, so that the inflation gas 75, pressing against the distal end 66 of the main bag 65, displaces the distal end 66 in a direction that coincides with the desired force vector for tearing open the seam 53. The main bag 65 gradually rolls up, as shown in Figure 7. Fig. 8 and Fig. Figure 9 shows the process until the distal end 66 tears open the suture 53 and rapidly moves into the desired area to protect the occupant in the event of a collision. Compared to the illustration, the rolling directions can also be reversed (which may be more desirable in some situations).

[0020] The embodiment of Fig. Figures 6-9 show a shielding bag with a single protruding body contained within a main bag with two differently folded sections. A second embodiment in Fig. 10 has a shielding bag with several protruding bodies and a main bag with a single folded section. More precisely, a seat 80 has a cover layer 81 with a tear seam 82 over a seat foam body (not shown) and contains a frame structure 83 to which a gas generator 84 of an airbag module 85 is attached. A shielding bag 86 is mounted over the gas generator 84 and has protruding bodies 87 and 88, which are contained within a main bag 89. Projecting bodies 87 and 88 each have gas passages 90 and 91 for connecting inflation gas to an inner chamber 92 of the main bag 89. The main bag 89 is folded with a Z-fold near the gas passages 90 and 91, such that when each Z-fold unfolds, the main bag 89 is displaced in the direction of the tear seam 82 until it tears the seam 82, as shown in Fig. 11 shown. The shielding bag 88 can also accommodate a significant expansion, as shown in Fig. Figure 11 shows that the expansion can be limited by attachments (not shown) to achieve favorable inflation behavior of the main bag 89, while the desired tension or loading of one side 93 of the seat 80 is maintained by the projecting body 88, which may contribute to the tearing of the seam 82. Furthermore, a section of the main bag 89 can be attached to a section of the seat frame 83 via a hook-and-loop fastener or a strap body 94 to further maintain the desired path of expansion of the main bag 89.

[0021] Fig. Figure 12 shows a further embodiment of a side airbag module of the present invention, which may be contained in a soft packaging envelope 100. A gas generator 101 has a mounting boss 102 for attachment to a seat frame (not shown). A calzone shield bag 103 is arranged over the gas generator 101 and has a projection body 104 configured as a Plus L fold. In the Plus L fold, the projection body 104 extends tangentially to the gas generator 101, such that a planar surface 105 of the projection body 104 tends to move laterally during inflation to exert additional force on the folded section of a main bag 106 (in the direction of a tear seam). More precisely, the main bag 106 can have an outer roller section 107 that receives inflation gas via a gas passage 108 in the projecting body 104. An inner rolling direction could also be used.Due to the injection of inflation gas at the gas passage 108, the upward movement of the planar surface 105 of the L-fold combines with the rolling process of the rolled section 107, whereby the main airbag 106 is displaced to a seam 110 of the soft packing 100 and follows a path indicated by arrow 111. Thus, the present invention achieves a rapid deployment of a main airbag in a desired direction through a tear seam in a passenger seat, without the need for reinforcement structures or double shells in the seat.

[0022] Fig. Figures 13-16 show a further embodiment of the invention in which the unfolding direction and the speed towards the gap can be further improved. In the Fig. In the embodiment shown in Figures 6-9, the length of the calzone shielding bag 60 is limited to the length of the bag pack itself. By introducing one or more back pleats into the shielding bag and optionally adding a connection to limit the expansion width of the shielding bag, its effective length during unfolding can be extended towards the tear seam, resulting in greater unfolding control and guidance of the main bag.

[0023] Fig. Figure 13 shows this alternative embodiment in a pre-deployment state. A shielding bag 120 is mounted above the gas generator 55 and has a projecting body 121 with a gas passage 122 at an intermediate location just behind a backfold 123, which creates a pair of upper and lower flaps 124 and 125. Although an upper and a lower flap are shown, alternatively a single flap (e.g., only an upper or only a lower flap) could be used. The main bag 65 is mounted above and contains the shielding bag 120. The main bag 65 has a first rolled section 71 arranged laterally at the flap 124 and a second rolled section 73 arranged laterally at the flap 125. As in the previous embodiment, the rolled sections 71 and 73 can each be inner or outer rolls which, when inflated at the gas passage 122, begin to roll up in one direction away from the gas generator 55 and towards the seam 53.In the present embodiment, however, the gas passage 122 preferably releases gas to the main bag 65 only when the calzone shielding bag 120 is fully or almost fully inflated. The folding of the flaps 124 / 125 over the gas passage 122 tends to keep the opening closed until the bag 120 has expanded. Any conventional active opening structures, such as tear-open mesh openings or silicone openings, can also be incorporated into the gas passage 122. Due to the way the flaps 124 and 125 function, the structure stiffens and elongates towards the seam 53 before the main bag 65 is rolled up. It is even possible for the seam 53 to at least partially open due to the inflation of the shielding bag 120 before significant amounts of gas flow into the main bag 65.

[0024] As more clearly shown Fig. As shown in Figure 14, the calzone shielding bag 120 preferably has an internal connection 126 between opposite sides of the bag 120 at a location between the gas passage 122 and the fold 123. By limiting the expansion width of the shielding bag 120, the connection 126 gives it a more elongated shape (with a smaller overall volume) and ensures better alignment of the expansion with the seam 53. As discussed below, additional openings can also be used upstream of the connection 126.

[0025] During an initial stage of unfolding, the tabs are, as in Fig. As shown in Figure 15, the shielding bag 120 is inflated, so that a distal end 130 extends towards the seam 53 and sometimes through it. As it unfolds, the gas passage 122 is exposed and any active opening structures present therein are opened, allowing inflation gas to enter the main bag 65, so that its distal end 66 protrudes through the seam 53 and into the gap between the seat and the door of the vehicle. Fig. At point 15, the connection 126 is not yet fully extended. Additional openings 131 are provided between the connection 126 and the distal end 130 to increase the degassing capacity into the main bag 65. A further opening or openings may also be formed at or near the distal end 130 to direct the filling of the main bag 65 towards the gap. The total opening area is designed to achieve a balance: the opening area is large enough to allow for rapid filling of the main bag and small enough to accommodate the local pressure increases necessary to provide a stiffening function.

[0026] In a Fig.In the later deployment stage shown in Figure 16, the shielding bag 120 is fully extended and has a shape controlled by the tether 126, which is now taut. The main bag 65 rolls up completely, and rapid and targeted deployment into the desired gap has been achieved.

Claims

[1] Airbag system for deployment from a structural element of a vehicle, comprising: a gas generator (55) that provides inflation gas in response to an activation signal, a main bag (65) in a folded state configured to be stored in an inner area behind a liner of the structural element, the main bag (65) having a distal end (66) configured to tear open a rip seam (53) in the liner, and a shielding bag (120) arranged above the gas generator (55) and having a projection body (121) extending away from the gas generator (55) to a remote edge within the main bag (65), wherein the projection body (121), Apart from at least one gas passage (122) at the remote edge for connecting inflation gas from the gas generator (55) to the main bag (65), is substantially continuous in the direction of the main bag (65), wherein the main bag (65) has a fold near the gas passage (122) so that the inflation of the main bag (65) begins with the fold being unfolded in such a way that the main bag (65) is displaced towards the tear seam (53), wherein the shielding bag (120) has a back fold (123) and a tab (124, 125) arranged on the projection body (121) and wherein the shielding bag (120) extends in a direction towards the tear seam (53) by inflating the tab (124, 125). [2] System according to claim 1, wherein the projection body (121) has a generally flat, planar shape before inflation with the inflation gas. [3] System according to claim 1, wherein the projection body (121) has an upper and a lower edge and wherein the gas passage (122) is substantially arranged at an intersection of the remote edge with one of the upper or lower edges. [4] System according to claim 3, wherein the remote edge has multiple gas passages and wherein each gas passage (122) is substantially located at an intersection of the remote edge with the upper and lower edges respectively. [5] System according to claim 1, wherein the main bag (65) has a first rolled section (71) arranged laterally on a first substantially planar surface of the projection body (121). [6] System according to claim 5, wherein the main bag (65) has a second rolled section (73) which is arranged laterally on a second, substantially planar surface of the projection body (121) opposite the first surface. [7] System according to claim 1, wherein the projection body (121) extends tangentially with respect to the gas generator (55) and wherein the main bag (65) has a folded section which is arranged laterally on a first substantially planar surface of the projection body (121) in close proximity to the gas generator (55). [8] System according to claim 7, wherein the folded section comprises an outer roll. [9] System according to claim 1, wherein the shielding bag (120) has a first and a second projection body extending tangentially to opposite sides of the gas generator (55), and wherein each projection body has at least one respective gas passage (122) at a remote edge thereof. [10] System according to claim 9, wherein the main bag (65) has a folded section arranged between the first and the second projection body. [11] System according to claim 10, wherein the folded section comprises a Z-fold. [12] System according to claim 1, wherein the tab (124, 125) is arranged over the gas passage (122) before inflation and closes it. [13] System according to claim 1, wherein the shielding bag (120) further comprises an internal connection in the projection body (121) to limit the extent width of the shielding bag (120). [14] Airbag system for deployment from a structural element of a vehicle, comprising a gas generator (55) that provides inflation gas in response to an activation signal, a main bag (65) in a folded state configured to be stored in an inner area behind a liner of the structural element, the main bag (65) having a distal end (66) configured to tear open a rip seam (53) in the liner, and a shielding bag (120) arranged above the gas generator (55) and having a projection body (121) extending away from the gas generator (55), the shielding bag (120) having a back fold (123) and a tab (124, 125) arranged on the projection body (121), the projection body (121) having at least one gas passage (122) covered by the tab (124, 125) for connecting inflation gas from the gas generator (55) to the main bag (65), the main bag (65) having a fold near the gas passage (122) such that the inflation of the main bag (65) begins with the fold unfolding in such a way that the main bag (65) is displaced towards the tear seam (53). [15] System according to claim 14, wherein the back fold (123) creates an upper flap (124) and a lower flap (125) on opposite sides of the projection body (121). [16] System according to claim 14, wherein the shielding bag (120) further comprises an internal connection in the projection body (121) to limit the extent width of the shielding bag (120). [17] Passenger vehicle, comprising: a passenger seat comprising a frame, seat foam and a cover, wherein the passenger seat has an internal cavity for receiving an airbag system for deployment through a tear seam (53) in the cover, the airbag system comprising: a gas generator (55) that provides inflation gas in response to an activation signal triggered by a collision, a main bag (65) in a folded state having a distal end (66) configured to tear open the tear seam (53) in relation to, and a shielding bag (120) arranged above the gas generator (55) and having a projection body (121) extending away from the gas generator (55) to a remote edge in the main bag (65), the projection body (121) being substantially continuous in the direction of the main bag (65), except for at least one gas passage (122) at the remote edge for connecting inflation gas from the gas generator (55) to the main bag (65), the main bag (65) having a fold near the gas passage (122) such that inflation of the main bag (65) begins with the fold unfolding in such a way that the main bag (65) is displaced towards the tear seam (53), the shielding bag (120) having a back fold (123) and a flap arranged on the projection body (121). (124, 125) and wherein the shielding bag (120) extends in a direction towards the tear seam (53) by inflating the flap (124, 125). [18] Vehicle according to claim 17, wherein the projection body (121) has a generally flat, planar shape before inflation with the inflation gas. [19] Vehicle according to claim 17, wherein the projection body (121) has an upper and a lower edge and wherein the gas passage (122) is substantially arranged at an intersection of the remote edge with one of the upper or lower edges. [20] Vehicle according to claim 19, wherein the remote edge has multiple gas passages and wherein each gas passage (122) is substantially located at an intersection of the remote edge with the upper and lower edges respectively. [21] Vehicle according to claim 17, wherein the main bag (65) has a first rolled section (71) which is arranged laterally on a first substantially planar surface of the projection body (121). [22] Vehicle according to claim 21, wherein the main bag (65) has a second rolled section (73) which is arranged laterally on a second, substantially planar surface of the projection body (121) opposite the first surface. [23] Vehicle according to claim 17, wherein the projection body (121) extends tangentially with respect to the gas generator (55) and wherein the main bag (65) has a folded section which is arranged laterally on a first substantially planar surface of the projection body (121) in close proximity to the gas generator (55). [24] Vehicle according to claim 23, wherein the folded section comprises an outer roller. [25] Vehicle according to claim 17, wherein the shielding bag (120) has a first and a second projection body extending tangentially to opposite sides of the gas generator (55), and wherein each projection body has at least one respective gas passage (122) at a remote edge thereof. [26] Vehicle according to claim 25, wherein the main bag (65) has a folded section arranged between the first and the second projection body. [27] Vehicle according to claim 26, wherein the folded section comprises a Z-fold. [28] Vehicle according to claim 17, wherein the tab (124, 125) is arranged over the gas passage (122) before inflation and closes it. [29] Vehicle according to claim 17, wherein the shielding bag (120) further comprises an internal connection in the projection body (121) to limit the extent width of the shielding bag (120).

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