Child car seat, arrangement and airbag system

Abstract

The invention relates to a (2) for a motor vehicle, comprising a base part (3) on which the child seat (2) can be arranged on a seat system (4) of the motor vehicle, a backrest (5) and a side part (7), wherein at least one support element (12) projecting outwards from the side part (7) in the transverse direction (8) of the vehicle, by means of which the side part (7) can be supported outwards on an airbag (13) of the motor vehicle in the transverse direction (8).

Description

[0001] The invention relates to a child seat for a motor vehicle according to the preamble of claim 1. Furthermore, the invention relates to an arrangement according to claim 6 and an airbag device for a motor vehicle according to claim 7.

[0002] EP 3 337 689 B1 discloses a child seat safety device with at least one seat shell and at least one side impact module, which is arranged on one side of the seat shell and is at least designed to absorb impact energy acting laterally on the seat shell, wherein the side impact module has at least one absorption element which is at least designed to convert impact energy.

[0003] The object of the invention is to create a child seat for a motor vehicle, an arrangement of a child seat in the interior of a motor vehicle, and an airbag device for a motor vehicle, so that the safety of the motor vehicle can be particularly increased.

[0004] This problem is solved according to the invention by a child seat for a motor vehicle with the features of claim 1, by an arrangement of a child seat in the interior of a motor vehicle with the features of claim 6, and by an airbag device for a motor vehicle with the features of claim 7. Advantageous embodiments of the invention are the subject of the dependent claims and the description.

[0005] A first aspect of the invention relates to a child seat for a motor vehicle. The motor vehicle is, for example, a passenger vehicle. For example, the motor vehicle has the child seat.

[0006] In particular, the child seat is one that can be, or is, installed in the interior of the motor vehicle. The interior, which can be referred to as the vehicle interior, can be understood to mean, in particular, the passenger compartment. Specifically, the seating system is designed or intended for a child, for example, a toddler, to sit in the motor vehicle, especially in the interior. The child seat is, for example, designed as an infant carrier. The child sitting in the child seat faces, for example, the rearward direction of travel of the motor vehicle. In other words, the child seat is, for example, a rear-facing child seat, meaning it is rearward-facing with respect to the longitudinal direction or forward direction of travel of the motor vehicle.

[0007] The child seat has at least one base component, via which the child seat can be arranged, or is arranged, on a seating system of the motor vehicle, particularly one that is separate from the child seat, and in particular can be fastened or secured. The child seat can thus be fastened in the vehicle, i.e., in the motor vehicle, particularly via the base component. Fastening can be achieved, for example, using Isofix and / or by means of a seat belt.

[0008] The term "seating system" can refer in particular to a vehicle seat. Specifically, the seating system is located within the vehicle's interior. For example, the seating system may be designed as a rear seating system, meaning the rear row of seats. Thus, the seating system is located, for example, in the rear section of the vehicle. The rear section can be understood to refer in particular to the area of ​​the interior located at the rear of the vehicle in the longitudinal direction. Specifically, the seating system is designed or intended for seating at least one person, specifically someone other than a child. This person can also be referred to as a "vehicle occupant."

[0009] The base preferably has at least one seating surface designed or intended for the child to sit on, which, for example, points upwards in the vehicle's vertical direction. This means that the child sits or can sit on the seating surface of the base. For example, the base includes a footrest and / or a leg rest for supporting the legs and / or feet of the child using the child seat, and in particular, for supporting the child sitting in the child seat.

[0010] Furthermore, the child seat has at least one backrest, which can be referred to as the backrest section. The base and the backrest can be designed separately or as a single unit. The backrest is designed, in particular, to support the back of the child, especially when seated in the child seat. This means that the backrest has, for example, at least one support surface for supporting the child, especially when seated in the child seat. Thus, the backrest, and in particular the support surface, can support the back of the child sitting in the child seat. The base and the backrest preferably extend diagonally or perpendicularly to each other. In particular, the seat surface and the backrest surface extend diagonally or perpendicularly to each other.

[0011] Furthermore, the child seat has at least one side panel, in particular arranged on the base and / or the backrest. For example, the child sitting in the child seat, in particular the upper body of the child sitting in the child seat, can be supported or is supported outwards in the transverse direction of the vehicle, in particular directly, on the side panel, for example on at least one inner surface of the side panel. The side panel can be formed separately from the base and / or separately from the backrest. Alternatively, the side panel is, for example, formed integrally with the base and / or integrally with the backrest. The side panel is, for example, part of an outer shell of the child seat. Thus, the outer shell, for example, includes the side panel.

[0012] To significantly enhance the safety of the motor vehicle, particularly for the child seat, the child seat has at least one support element projecting outwards from the side panel, especially when the child seat is installed or positioned in the vehicle interior, in the transverse direction of the vehicle, for example, diagonally or vertically. In other words, the support element connects to the side panel, especially the outer shell, in the transverse direction of the vehicle, at least indirectly, for example, directly. The side panel, especially when the child seat is installed or positioned in the vehicle interior, can be supported or is supported by the support element against an airbag, particularly a deployed airbag, for example, against at least one airbag deployment area of ​​the motor vehicle.In other words, in an accident, preferably a side collision, the airbag of the motor vehicle can be deployed by the support element of the child seat, or is deployed when the airbag collides with the child seat. This means that when the child seat collides with the airbag, the deployment of the airbag by the support element of the child seat is simultaneous. Put another way, when the airbag deploys, it is pressed, particularly directly, against the support element of the child seat.

[0013] The airbag can be described as an airbag. Specifically, the airbag can be moved from a storage position into at least one protective position, preferably different from the storage position, for restraining the child seat and / or for restraining at least one vehicle occupant seated in the vehicle. This means that the airbag can be moved, or is moved, from the storage position into the at least one protective position to restrain the vehicle occupant seated in the vehicle and / or the child seat installed in the vehicle. In other words, the airbag can be moved, preferably automatically, from the storage position into the protective position. When the airbag is in the protective position, it is preferably deployed. This means that the airbag can be moved, or is moved, from the storage position into the protective position to deploy.Thus, the term "deployed airbag" can be understood to refer specifically to the airbag in its protective position. The airbag is designed, for example, as a head airbag, meaning it is specifically intended to protect the head of the vehicle occupant.

[0014] For example, in the stowed position, the airbag is arranged, in particular predominantly or completely, within at least one receiving space. This receiving space is separated or insulated from the interior, for example, by at least one of its trim elements. In the deployed position, the airbag is arranged, at least predominantly, in particular completely, outside the receiving space. This means that the airbag can be moved, or is moved, from the stowed position out of the receiving space into the deployed position to restrain the vehicle occupant and / or the child seat.

[0015] The storage position can be referred to as the stowed position. The protective position can be referred to as the restraint position or the catch position. Preferably, the airbag is designed to be deployable from the storage position to the protective position in the event of a vehicle accident, i.e., in the event of a vehicle accident, in order to restrain the vehicle occupant and / or the child seat. Preferably, the airbag occupies a significantly larger volume in the protective position compared to the storage position. This volume is preferably located within the vehicle's interior.This allows, for example, a vehicle occupant located in the interior or seated on the vehicle, especially if the occupant is shifted or moved due to an accident, to be caught and restrained by the airbag in its protective position. Alternatively or additionally, a child seat installed on the vehicle can also be caught and restrained by the airbag in its protective position, especially if the child seat is shifted or moved due to an accident.

[0016] To move the airbag from its stowed position to its deployed position, a fluid, in particular a gas, such as air, is introduced into the airbag, preferably explosively, by means of a gas injection. The gas is supplied, for example, by a gas generator, preferably explosively, which allows the airbag to be moved from its stowed position to its deployed position particularly quickly, i.e., in a very short time. The gas generator is thus, for example, a pyrotechnic actuator. In other words, at least one triggering device is provided by means of which the airbag can be moved from its stowed position to its deployed position, particularly in the event of an accident, to restrain the vehicle occupant and / or the child seat.

[0017] The invention is based in particular on the following findings and considerations: In order to provide the best possible protection for the child sitting in the child seat, there are, for example, load cases, which can also be referred to as crash tests. In such a load case, a child dummy, in particular a Q3 child dummy, is placed rear-facing in the child seat. This load case is, for example, a pole side impact. This load case could, for example, be the "China NCAP" crash test. In the crash test, the vehicle can collide laterally with an obstacle, such as a crash barrier. A side impact can cause the child dummy, along with the child seat, to be accelerated, which can force the child dummy and child seat laterally into the deployed airbag, for example, in the transverse direction of the vehicle.To ensure the airbag effectively restrains the child in the child seat, certain factors are crucial, such as chamber thickness and / or the pressure within the deployed airbag, particularly during the impact of the child seat. The chamber thickness, often simply referred to as thickness, is limited, as excessive thickness can significantly increase the risk of airbag damage. Similarly, the pressure can be limited by the gas generator, installation space constraints, or load limits in other scenarios.Conventional child seats do have small geometries such as brackets, but these are traditionally used primarily for support against a door panel of the vehicle in a crash and are therefore not suitable for supporting the child seat against the airbag, and in particular for reducing load values.

[0018] In contrast, the aforementioned disadvantages can be overcome by means of the child seat according to the invention. The core idea of ​​the invention is, in particular, that by modifying the child seat, i.e., by modifying the support element, for example, by modifying the child seat and the airbag, a system can be created which, especially in combination, can restrain the child dummy and the child seat particularly well, i.e., brake them, thereby keeping the stress values ​​acting on the child or the child dummy during the accident or crash test particularly low. These stress values ​​can, in particular, be kept below a limit value. This means that the acceleration of the child dummy can be significantly reduced, thereby keeping stress values, such as the head acceleration of the child dummy, particularly low and, in particular, below the limit value.By bracing the side panel with the support element, meaning the airbag is compressed by the support element, the pressure within the airbag can be significantly increased. This means that when the airbag impacts the child seat at the side panel, especially directly, i.e., when it collides with the side panel, the pressure within the airbag is higher than if the aforementioned bracing had not occurred. This allows the child seat to be restrained more effectively, thus minimizing the forces exerted on the child or child dummy during an accident. Overall, it is evident that a reduction in the forces exerted on child dummies in side-impact crash tests can be achieved.

[0019] To significantly enhance the safety of the vehicle, particularly for the child seated in the child seat, it is preferably provided that when the side panel is supported by the support element against the airbag, a pressure increase occurs within the airbag, preferably locally, caused by the support element. This means that as a result of the support element being supported against the airbag, i.e., as a result of the airbag being impacted by the support element, the pressure within the airbag can be increased or is actually increased. This pressure increase persists, in particular, at least until the airbag, especially once deployed, impacts the side panel, preferably bypassing or avoiding the support element, and in particular directly.This ensures that a particularly high, ideal, or optimal pressure is maintained within the airbag when restraining the child seat. One principle for achieving the aforementioned deceleration of the dummy or child seat, and especially the particularly low impact forces, is therefore an artificial, for example, temporary, increase in pressure within the airbag by another component in the form of the support element.

[0020] To further enhance vehicle safety, a further design provides that the airbag's impact on the support element, particularly directly, occurs before the airbag's impact on the side panel, particularly directly. This means that the airbag impacts the side panel, specifically bypassing or avoiding the support element, only after the airbag has impacted the support element. In other words, when the airbag deploys, the airbag is first impacted by the support element, and only then is the side panel impacted, particularly directly. Impact on the side panel by the airbag can be understood to mean impacting the side panel without using the support element, i.e., bypassing it.This ensures, for example, that the aforementioned pressure increase has already occurred when the airbag deploys against the side panel to restrain the child seat.

[0021] In a further embodiment, the support element is designed to be rib-shaped, particularly at least in certain areas. This means that the support element is shaped like a rib. In other words, the support element is designed as a support rib. This allows the child seat to be particularly well supported by the airbag via the support element, thus enabling the aforementioned pressure increase to be achieved particularly effectively.

[0022] In a further embodiment, the support element is, in particular at least partially, round, especially spherical and / or oval. This allows the aforementioned support element to be particularly well braced against the airbag, thereby enabling a particularly effective pressure increase.

[0023] A second aspect of the invention relates to an arrangement of at least one child seat according to the first aspect of the invention in the interior of a motor vehicle, in particular on a seat assembly of the motor vehicle. Advantages and advantageous embodiments of the first aspect of the invention are to be regarded as advantages and advantageous embodiments of the second aspect of the invention and vice versa.

[0024] A third aspect of the invention relates to an airbag device for a motor vehicle. Preferably, the motor vehicle, particularly in a fully manufactured state, includes the airbag device. Advantages and advantageous embodiments of the first and second aspects of the invention are to be regarded as advantages and advantageous embodiments of the third aspect of the invention, and vice versa.

[0025] The airbag device has at least one airbag which can be moved or is moved from a storage position into at least one protective position, in particular different from the storage position, for restraining a child seat according to the first aspect of the invention.

[0026] To significantly enhance the safety of the vehicle, particularly for the child seat, the airbag has at least one deployment area where, specifically in the stowed and protective positions, the child seat's support element can be directly or directly impacted. In other words, the airbag in the protective position can be directly or directly impacted by the child seat's support element. This can, for example, cause a local and / or temporary increase in pressure within the airbag.

[0027] To enable a particularly rapid and / or significant increase in pressure within the airbag, the airbag may, for example, have several chambers that can be filled with air or are already filled. When the airbag is moved from its storage position to its deployment position, the chambers are preferably filled with air. At least one of the chambers is at least partially confined to the impact area. In other words, at least one of the chambers is at least partially enclosed by the impact area. Preferably, at least one of the second chambers is not confined to the impact area. This means that at least one of the second chambers is not confined to the impact area, particularly not directly. In other words, at least one of the second chambers is spaced apart from the impact area.This means that the volume of the first chamber, especially when filled with air or already filled, is less than the total volume of the airbag, which can cause the pressure in the first chamber to increase particularly quickly and / or strongly, especially locally, when the impact area of ​​the child seat is acted upon.

[0028] In a further embodiment, the first and second chambers are fluidically separated from each other, particularly at least partially. In other words, no fluidic connection, especially a direct one, is provided between the first and second chambers. This allows the pressure increase in the airbag, relative to the first and second chambers, to occur exclusively in the first chamber when the impact area is acted upon by the support area, thus enabling a particularly rapid pressure increase in the first chamber.

[0029] In a further embodiment, the airbag device has at least one diffuser, in particular one through which air can flow or is flowing, through which the chambers, in particular for moving the airbag from the storage position to the protective position, can be filled with air. In other words, the chamber is filled with air via the diffuser. Thus, for example, air can be introduced into the chambers, in particular in a controlled manner, via the diffuser, especially to fill the chamber with air. The diffuser can be fluidically connected, in particular directly, to the first chamber via at least one filling channel, in particular one through which air can flow or is flowing, bypassing the second chamber.In other words, the diffuser is fluidically connected to the first chamber via the inflation channel, specifically with regard to the first and second chambers exclusively. In other words, air can be introduced from the diffuser into the first chamber via the inflation channel, specifically with regard to the first and second chambers exclusively, in order to inflate the first chamber. This allows a particularly rapid and / or large volume of air to be introduced into the first chamber via the inflation channel, resulting in a particularly strong pressure increase when the impact area of ​​the child seat is activated. This is because a particularly large volume of air is already present in the first chamber, and the air introduced into the airbag can be concentrated, particularly in the first chamber, with respect to both the first and second chambers.The second chamber is filled, for example, after the first chamber has been filled.

[0030] Further features of the invention will become apparent from the claims, the figures, and the description of the figures. The features or combinations of features mentioned above in the description, as well as the features or combinations of features mentioned below in the description of the figures and / or shown in the figures alone, are not only usable in the combinations specified, but also in other combinations or on their own.

[0031] The invention will now be explained in more detail with reference to a preferred embodiment and the drawings. These show: Fig. 1 a schematic side perspective view of an arrangement according to the invention; Fig. 2 a schematic side view of an arrangement according to the invention; Fig. 3 a schematic and perspective partial view of the interior of a motor vehicle with an deployed airbag of an airbag device according to the invention; Fig. 4 a schematic and perspective partial view of the interior of a motor vehicle with a deployed airbag of an airbag device according to a further embodiment of the invention; and Fig. 5 a schematic partial view of the interior of a motor vehicle to illustrate the deployment of an airbag of an airbag device according to the invention from a support element of a child seat according to the invention.

[0032] In the figures, identical or functionally equivalent elements are provided with the same reference symbols.

[0033] In Fig. Figure 1 shows a section of the interior 1 of a motor vehicle in a schematic perspective view. A child seat 2 is arranged in the interior 1. Thus, in Fig. 1 an arrangement of the child seat 2 in the interior 1 of the motor vehicle is shown. Fig. Figure 2 shows the arrangement or the interior space 1 in a schematic side view.

[0034] The child seat 2 has at least one base 3, via which the child seat 2 can be or is arranged on a seating system 4 of the motor vehicle. In this case, the seating system 4 is arranged in the interior 1. Furthermore, the child seat 2 has a backrest 5. The child seat 2 is designed or intended for seating a child 6. While the child 6 is sitting in the child seat 2, in particular on the base 3, the child 6 can, in this case, rest their back against the backrest 5.

[0035] How particularly good in Fig. As can be seen from 1, the child seat 2 has at least one side panel 7. The side panel 7, for example, extends outwards in the vehicle's transverse direction 8 to the backrest 5. The vehicle's transverse direction 8 is in Fig. Figure 1 illustrates this using a coordinate system 9, which also illustrates the longitudinal direction 10 and the vertical direction 11 of the vehicle. The side part 7 is, for example, formed by an outer shell of the child seat 2.

[0036] To enhance the safety of the motor vehicle, particularly for the child 6 seated in the child seat 2, the child seat has at least one support element 12 projecting outwards in the transverse direction 8 of the vehicle, specifically directly from the side panel 7, by means of which the side panel 7 can be supported or is supported outwards in the transverse direction 8 against an airbag 13 of the motor vehicle, specifically against an impact area 14 of the airbag 13, for example, directly. The airbag 13 is, for example, part of an airbag system 15. This means that the airbag system 15 includes at least the airbag 13. The airbag 13 can be moved from a storage position to a protective position 16 to restrain the child seat 2, specifically to restrain the child 6 seated in the child seat 2.The airbag 13 has the impact area 14, on which, in the protective position 16, at least one support element 12 of the child seat 2 can be supported or is supported. Fig. 2. The airbag 13 is in protective position 16. The impact area 14 is in Fig. Figure 3 illustrates how the interior space 1 is shown in a schematic partial view, that is, in section. It contains... Fig. 3 the airbag 13 also in the protective position 16. The impact area 14 is, for example, a meeting point at which the airbag 13, when unfolding, in particular in the protective position 16 or when moving into the protective position 16, impacts the at least one support element 12, in particular directly.

[0037] The child seat 2 is thus modified, for example, on its outer shell and receives at least one additional geometry in the form of at least one support element 12 in order to act upon the airbag 13 when it is deployed, in particular in a targeted manner.

[0038] When the at least one support element 12 is supported by the airbag 13, that is, when the side panel 7 is supported by the at least one support element 12 on the airbag 13, at least one pressure increase preferably occurs in the airbag 13, particularly caused by the at least one support element 12. Furthermore, the airbag 13 preferably acts, particularly directly, on the support element 12 before the airbag 13 acts, particularly directly, on the side panel, especially bypassing or avoiding the support element 12. The at least one additional geometry, particularly in the form of the at least one support element 12, can therefore, in a side crash, force air into an airbag, which is particularly part of the airbag designed as a head airbag, and thereby lead to the, in particular artificial, preferably temporary, pressure increase in the airbag.

[0039] For example, at least one support element 12 is rib-shaped and / or round, in particular spherical. Of course, it is possible for several such support elements 12 to be provided, wherein, for example, at least one first support element 12a is rib-shaped and, for example, at least one second support element 12b is round, in particular spherical. Thus, additional geometries such as ribs can act on the airbag 13, in particular in a targeted manner, to cause the aforementioned pressure increase in the airbag. For example, different variants are possible, such as, alternatively or additionally, a spherical shape.

[0040] In Fig. Figure 4 shows the interior space 1 in a schematic and perspective partial view, where in Fig. Figure 4 illustrates the airbag device 15 according to a further embodiment, in which the airbag 13 has several air-fillable chambers 17, 18. At least one first chamber 17 is at least partially, and in particular directly, limited by the impact area 14. In this embodiment, at least one second chamber 18, which is distinct from the first chamber 17, is not limited by the impact area 14. For example, the second chamber 18 is spaced apart from the first chamber 17 and / or from the impact area 14. The airbag 13 can thus be modified such that the first chamber, which is at least partially formed by the impact area 14, is located in the area of ​​a meeting point of the at least one support element 12 on the airbag 13 in the form of the impact area 14.The at least one support element 12, also referred to as additional geometry, thus applies, for example, to the first chamber 17 exclusively, particularly with regard to the first and second chambers 17, 18. In other words, the first chamber 17 applies to at least one support element 12.

[0041] For example, the airbag device 15 has at least one diffuser 19 through which the chambers, that is, in particular at least the first and the second chambers 17, 18, can be filled with air or are filled with air. In this case, the diffuser 19 can be fluidically connected to the first chamber 17 via at least one filling channel 20, bypassing the second chamber 18, and in particular directly. The first and the second chambers 17, 18 are, for example, fluidically separated from each other. A channel in the form of the filling channel 20 on the diffuser 19 thus allows for a particularly early filling of the first chamber 17 with air, that is, in particular, an earlier or faster filling of the first chamber 17 than of the second chamber 18, whereby, in particular, no fluidic connection to the second chamber 18, which is, for example, configured as a rear chamber, is provided.

[0042] The operating principles explained so far are in Fig. Figure 5 illustrates this again, showing the interior space 1 in a schematic and perspective partial view. In this figure, Fig. Figure 5 illustrates in particular how the at least one additional geometry in the form of the support element 12 is supported by the airbag 13, in particular directly, to induce the airbag 13. Also shown is a contour 21 of the child seat 2, formed, for example, by the side part 7, which differs from the at least one support element 12. This contour 21 has a later point of contact with the, in particular deployed, airbag 13 than the at least one support element 12. Additional geometries in the form of the support elements 12 can thus press into the airbag on the first chamber 17 during a side impact and thereby lead to an artificial, temporary increase in pressure in the airbag or in the airbag 13.

[0043] It is of course possible for the child seat 2 to have a second side panel 22 that differs from the first side panel 7, with the side panels 7 and 22 being arranged on different sides of the child seat 2 in the transverse direction 8 of the vehicle. For example, equivalent to the first side panel 7, at least one support element 12 is arranged on the outside of the second side panel 22 in the transverse direction 8 of the vehicle, projecting outwards from the second side panel 22 in the transverse direction 8 of the vehicle. The second side panel 22 can be supported, or is supported, by this support element 12, for example, against an airbag 13 of the vehicle in the transverse direction 8 of the vehicle. The child seat 2 can therefore be arranged on either the left or the right side of the vehicle with respect to the transverse direction 8 of the vehicle. Reference symbol list 1 Interior 2 child seats 3 Basic part 4-seat system 5 Backrest 6 children 7 Side panel 8 Vehicle transverse direction 9 Coordinate system 10 Vehicle longitudinal direction 11 Vehicle lifting direction 12 support elements 12a first support element 12b second support element 13 Airbag 14 Area of ​​application 15 Airbag system 16 Protective position 17 first chamber 18 second chamber 19 Diffuser 20 filling channel 21 contour 22 second side section QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] EP 3 337 689 B1

[0002]

Claims

[1] Child seat (2) for a motor vehicle, comprising a base (3) on which the child seat (2) can be arranged on a seat assembly (4) of the motor vehicle, comprising a backrest (5) and a side panel (7), characterized by at least one support element (12) projecting outwards from the side part (7) in the transverse direction (8) of the vehicle, by means of which the side part (7) can be supported outwards in the transverse direction (8) of the vehicle on an airbag (13) of the motor vehicle. [2] Child seat (2) according to claim 1, characterized by , that when the side panel (7) is supported by the support element (12) on the airbag (13) an increase in pressure occurs in the airbag (13). [3] Child seat (2) according to claim 1 or 2, characterized by , that the support element (12) is acted upon by the airbag (13) prior to the side part (7) being acted upon by the airbag (13). [4] Child seat (2) according to any one of the preceding claims, characterized by, that the support element (12) is rib-shaped. [5] Child seat (2) according to any one of the preceding claims, characterized by , that the support element (12) is round, in particular spherical. [6] Arrangement of a child seat (2) according to one of the preceding claims in an interior of a motor vehicle. [7] Airbag device (15) for a motor vehicle, comprising an airbag (13) which can be moved from a storage position into a protective position (16) for restraining a child seat (2) according to one of claims 1 to 5, wherein the airbag (13) has an impact area (14) on which, in the protective position, the support element (12) of the child seat (2) can be supported. [8] Airbag device (15) according to claim 7, characterized by, that the airbag (13) has several chambers (17, 18) that can be filled with air, wherein at least one first chamber (17) is at least partially limited by the impact area (14) and at least one second chamber (18) is not limited by the impact area (14). [9] Airbag device (15) according to claim 8, characterized by , that the first and second chambers (17, 18) are fluidically separated from each other. [10] Airbag device (15) according to claim 8 or 9, characterized by a diffuser (19) through which the chambers (17, 18) can be filled with air, wherein the diffuser (19) can be fluidically connected or connected to the first chamber (17) via a filling channel (20) bypassing the second chamber (18) for filling the first chamber (17).

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