Vehicle seat

Abstract

The present invention relates to a vehicle seat for a motor vehicle, comprising a seat back (10), a seat (11) and an airbag device, the airbag device comprising at least one airbag module (12) and at least one arrestor strap mechanism, the at least one airbag module (12) comprising at least one airbag, the at least one arrestor strap mechanism comprising at least one arrestor strap arrangement (2) and at least one tensioning device (3) for the arrestor strap arrangement (2), one end of the arrestor strap arrangement (2) being attached to the airbag, and the tensioning device (3) being arranged on the seat (11).

Description

[Technical field]

[0001] The present invention relates to a vehicle seat for a motor vehicle, comprising a seat back, a seat and an airbag arrangement, the airbag arrangement comprising at least one airbag module and at least one arrester strap mechanism, the at least one airbag module comprising at least one airbag, the arrester strap mechanism comprising at least one arrester strap arrangement and at least one tensioning device for the arrester strap arrangement, one end of the arrester strap arrangement being attached to the airbag. [Background technology]

[0002] For example, from US 2019 / 0248322 A1, such a vehicle seat is known with an arrestor strap mechanism. The airbag, which is arranged in the side region of the seat back in the initial state, unfolds next to and / or in front of the occupant on the vehicle seat after activation. It may be provided, for example, that the arrestor strap arrangement induces the deployment process at least temporarily during deployment of the airbag when the arrestor strap arrangement is in a tensioned state. It is also conceivable that the arrestor strap arrangement is unwound from a spool during deployment or tensioned from a wound or folded state by the deploying airbag.

[0003] According to US 2019 / 0248322(A1), a tensioning device arranged on the seat back is provided to retract the arrestor strap arrangement during deployment or at the end of the deployment process and thus to influence the deployment process or to bring the airbag to a final position after deployment. For example, a part of the airbag mounted in front of the occupant after deployment can be pulled towards the seat back by the tensioning device, so that the occupant is also pulled towards the seat back. From US 2019 / 0248322(A1), it is known to wind up the arrestor strap arrangement by the tensioning device, for example through a rotational movement. Summary of the Invention

[0004] It is an object of the present invention to provide an alternative method of tensioning an arrestor strap arrangement.

[0005] The solution for achieving the object is specified in the independent claim 1, further solutions and advantageous developments are specified in the dependent claims as well as in the preceding and subsequent description, the individual features of the advantageous developments being capable of being combined with one another in a technically rational manner.

[0006] The object is achieved in particular by a vehicle seat having the above mentioned characteristics, in which the tensioning device is arranged on the seat.

[0007] In other words, the basic idea of ​​the invention is that the tensioning device is not arranged on the backrest and thus adjacent to the airbag module, but instead the tensioning device for the arrestor strap arrangement is arranged on the seat of the vehicle seat, so that the centre of gravity of the seat is located lower. The arrestor strap arrangement, which can be tensioned by the tensioning device, can be guided to other parts of the vehicle seat via suitable guides.

[0008] A vehicle seat typically includes a solid base structure (eg, some type of frame) called a seat well, and trim material that covers at least the upper side of the seat well.

[0009] Here, it may be provided that the tensioning device is attached to the seat well of the seat. In the state installed in the vehicle, the tensioning device is therefore fixed directly above the seat well. In principle, the tensioning device can be arranged below the seat well and attached there. Alternatively, the tensioning device can be attached to one side of the seat well. However, it is preferred that the tensioning device is arranged above the seat well of the seat, in particular that it is directly connected to the seat well.

[0010] It may be provided that the tensioning device is arranged in the interior material of the seat, so that it is at least partially surrounded by the interior material of the seat, and for that purpose the interior material may have a recess for accommodating the tensioning device.

[0011] The tensioning device preferably comprises a tensioning element which can be linearly accelerated, in particular by means of a pyrotechnic drive.

[0012] The tensioning device may, for example, comprise a tensioner tube in which a piston is disposed. For example, an inflator may be used to introduce compressed gas into the tensioner tube, which drives the piston through the tensioner tube. The piston, particularly disposed within the tensioner tube, is connected to the tensioning element, for example via a piston rod, such that the tensioning element is driven directly by the acceleration of the piston.

[0013] The tensioning device is coupled to the arrestor strap arrangement in such a way that the tensioning element deflects the arrestor strap arrangement at least before and / or during the tensioning process, in particular via the tensioning element. The parts arranged in front and behind the tensioning element in the direction of the arrestor strap are thus arranged at an angle to each other. For example, the arrestor strap arrangement can be deflected by the tensioning element by more than 60°, preferably more than 90°, or approximately 180°. The degree of deflection can be constant during the tensioning process, but can also change during the tensioning process. In a preferred embodiment, a deflection of 180°, which does not change during the tensioning process, is performed by the tensioning element.

[0014] In particular, it may be provided in this context that the arrester strap arrangement is fixed on one side of the tensioning device and is guided on the opposite side of the tensioning device, for example for tensioning movement in a guide with an opening, the arrester strap arrangement preferably extending parallel to the linear movement direction of the tensioning element and offset laterally with respect to the tensioning device, in particular before and preferably during the tensioning process.

[0015] The linearly accelerated arrestor strap arrangement and tensioning element are in particular arranged in such a way that a type of pulley is formed, through which the tensioning element forms a movement deflection. The linearly accelerated arrestor strap arrangement and tensioning element are in particular arranged in such a way that the end of the arrestor strap arrangement attached to the airbag covers a longer distance during the tensioning process than the linearly accelerated tensioning element. For this purpose, the arrestor strap mechanism can comprise one or more deflectors for the arrestor strap arrangement.

[0016] In particular, the tensioning device is arranged in such a way that it is possible to accelerate the tensioning element in a transverse direction of the sheet, typically in the installed state in a vehicle, the linear acceleration direction of the tensioning element extending transversely, preferably perpendicularly, to the longitudinal direction of the vehicle.

[0017] Each arrester strap arrangement can be made from a single arrester strap or arrester rope, especially made from a tension fabric. The arrester strap arrangement can also be made from multiple arrester straps / arrester ropes connected together.

[0018] In a preferred embodiment, it may be provided that the piston rod of the tensioning device is formed of several parts, in particular two parts, which are arranged in a nested manner relative to one another. In comparison with a one-piece piston rod, a multi-piece nested piston rod has the advantage that the tensioning element connected to the piston rod can cover a longer path with the same length of tensioner tube. In the initial state, the nested parts of the piston rod are pressed against one another and are moved axially towards one another by applying pressure, thereby allowing a path of the tensioning element that is almost twice as long. Thus, all parts of the piston rod are driven by compressed gas.

[0019] It may be provided that the tensioning element is attached directly to the piston rod of the tensioning device. However, in one embodiment, a type of cage is provided for attachment to the piston rod, and the tensioning element, for example designed as a deflection roller, is arranged in the cage. In addition, a guide for the arrestor strap arrangement can be provided in the cage, whereby the arrestor strap arrangement is guided towards and away from the tensioning element along a predetermined path.

[0020] In a preferred embodiment, the vehicle seat comprises two airbag modules, in particular arranged on either side of the seat back, and at least one arrestor strap arrangement is attached to each airbag of the airbag modules.

[0021] In principle it is possible to tension several arrestor strap arrangements with only one tensioning device, however, each airbag module is preferably assigned a tensioning device which is arranged on the seat.

[0022] The present invention also relates to an arrestor strap arrangement and tensioning device for a vehicle seat, and the features described above with reference to the vehicle seat can be applied to the arrestor strap mechanism. [Brief description of the drawings]

[0023] The invention and the technical environment are explained below by way of example with reference to the figure, which shows, diagrammatically: [Figure 1] FIG. 1 shows a seat well of a vehicle seat having two tensioning devices. [Diagram 2] FIG. 2 is a perspective view of the tensioning device. [Diagram 3] FIG. 3 is an exploded view of the tensioning device. [Figure 4] FIG. 4 is a cross-sectional view of a tensioning device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] The tensioning device shown in Figures 2 to 4 comprises a tensioner tube 6 in which a piston rod 5 is arranged. The piston rod 5 can be linearly accelerated by compressed gas produced by an inflator 7. At the end of the piston rod 5 which in the initial state protrudes beyond the tensioner tube 6, a cage 8 is attached, on which a tensioning element 4 designed as a deflection roller is mounted.

[0025] The tensioning device 3 is also coupled to the arrestor strap arrangement 2, which is fixed to one side of the tensioner tube 6 and from there guided through a cage 8 and deflected by the tensioning element 4. The arrestor strap arrangement 2 is guided laterally through the cage 8 to the other side of the tensioner tube 6. The cage 8 is arranged in a housing 9 such that the cage 8 is protected by the housing 9 during the tensioning movement.

[0026] Figure 1 shows the basic frame of a vehicle seat, with a backrest 10 and a seat 11. From figure 1 it can be seen that two tensioning devices 3 are mounted directly in the seat well 1 of the seat 11 of the vehicle seat. The tensioning devices 3 are aligned such that the tensioning elements 4, when installed in the vehicle, are accelerated perpendicular to the longitudinal direction of the vehicle. The arrestor strap arrangements 2 are each guided by suitable guides of the airbag of an airbag module 12 mounted on either side of the backrest 10 of the vehicle seat.

[0027] Upon activation, the tensioning element 4 is linearly accelerated by the piston rod 5, which causes the free end of the arrester strap arrangement 2 attached to the airbag to retract. The tensioning device 3 forms a type of pulley for the arrester strap arrangement 2, whereby the tensioning path covered by the free end of the arrester strap arrangement 2 corresponds approximately to twice the path covered by the tensioning element 4. The airbag can be guided by the arrester strap arrangement 2 during deployment or can be brought to a desired position by the arrester strap arrangement after deployment. [Explanation of symbols]

[0028] 1 Seat Well 2 Arrester Strap Configuration 3 Tensioning device 4 Tensioning elements 5 Piston rod 6 Tensioner tube 7 Inflator 8 Cage 9. Housing 10 Backrest 11 sheets 12 Airbag Module

Claims

1. A vehicle seat for a motor vehicle, comprising: - a backrest (10), - a seat (11), an airbag device, said airbag device comprising at least one airbag module (12) and at least one arrester strap mechanism, the at least one airbag module (12) comprises at least one airbag; the at least one arrestor strap mechanism comprises at least one arrestor strap arrangement (2) and at least one tensioning device (3) for the arrestor strap arrangement (2), one end of the arrestor strap arrangement (2) being attached to the airbag; A vehicle seat, characterized in that the tensioning device (3) is arranged on the seat (11).

2. 2. The vehicle seat according to claim 1, wherein the tensioning device (3) is mounted in a seat well (1) of the seat (11).

3. 3. The vehicle seat according to claim 1 or 2, wherein the tensioning device (3) is arranged above a seat well (1) of the seat (11).

4. The vehicle seat according to any one of claims 1 to 3, wherein the tensioning device (3) is arranged in an upholstery material of the seat (11).

5. 5. The vehicle seat according to claim 1, wherein the tensioning device (3) comprises a tensioning element (4), the tensioning element (4) being capable of being linearly accelerated.

6. 6. The vehicle seat according to claim 5, wherein the tensioning device (3) is arranged such that the tensioning element (4) can be accelerated in a lateral direction of the seat (11).

7. 7. The vehicle seat according to claim 5 or 6, wherein the tensioning element (4) can be accelerated pyrotechnically.

8. 8. The vehicle seat according to claim 1, wherein the tensioning device (3) has a preferably multi-part drivable piston rod (5), the parts of which are nested relative to one another.

9. The vehicle seat according to any one of the preceding claims, wherein the tensioning device (3) comprises a tensioning element (4), the tensioning element (4) biasing the arrester strap arrangement (2).

10. 10. The vehicle seat according to claim 9, wherein the arrestor strap arrangement (2) is fixed on one side of the tensioning device (3) and is guided for tensioning movement on the opposite side of the tensioning device (3).

11. 11. The vehicle seat according to claim 9 or 10, wherein the arrestor strap arrangement (2) runs transversely to the tensioning device (3) and parallel to the linear movement direction of the tensioning element (4).

12. 12. The vehicle seat according to claim 1, wherein the airbag device comprises two airbag modules (12), the two airbag modules (12) being arranged on either side of the seat back (10), and an arrester strap arrangement (2) being associated with each airbag module.

13. 13. The vehicle seat according to claim 12, wherein a tensioning device (3) is associated with each airbag module (12), said tensioning devices (3) respectively being arranged on the seat (11).

14. An arrester strap mechanism for a vehicle seat, in particular a vehicle seat according to any one of claims 1 to 13, comprising: at least one arrestor strap arrangement (2), one end of which can be attached to said airbag; - a tensioning device (3) for said arrestor strap arrangement, Equipped with 1. An arrestor strap mechanism, comprising: a tensioning device (3) comprising a tensioning element (4), the tensioning element (4) biasing the arrestor strap arrangement (2).

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