System for insulating a structural element

1. A system for insulating a structural element in a motor vehicle, the system comprising:

a structural element having a first constituent part and a second constituent part, the constituent parts being joined together at a first joining point and at a second joining point, and the structural element forming a cavity;

a device having a carrier and a first expandable adhesive, the carrier being arranged on the first constituent part of the structural element by way of a fastening element; and

a second expandable adhesive which is arranged on the second constituent part of the structural element,

wherein the first expandable adhesive and the second expandable adhesive are in a non-expanded state and are configured, and arranged, in such a way that, after the adhesives have been expanded, the device and the second adhesive substantially completely fill a cross section of the structural element.

2. The system as claimed in claim 1 , wherein the device has at least one of (i) a stackable form, and (ii) substantially a form of a cuboid, cylinder, truncated cone, cone, or cone of revolution.

3. The system as claimed in claim 1 , wherein the carrier and the first expandable adhesive together have a thickness of at least 3 mm on a total base area of the device.

4. The system as claimed in claim 1 , wherein the first expandable adhesive has an expansion rate of between 1000% and 3000%.

5. The system as claimed in claim 1 , wherein the device is produced by an injection-molding process.

6. The system as claimed in claim 1 , wherein the second expandable adhesive is a pumpable or extrudable material.

7. The system as claimed in claim 1 , wherein the second expandable adhesive has an expansion rate of at least 200%.

8. The system as claimed in claim 1 , wherein the second expandable adhesive is arranged in the form of a bead or a plurality of beads on the second constituent part.

9. The system as claimed in claim 8 , wherein the at least one bead has a diameter of 2 to 20 mm and/or wherein the at least one bead has a length of at least 10 mm.

10. The system as claimed in claim 1 , wherein the second expandable adhesive contacts the structural element at the first joining point and at the second joining point.

11. The system as claimed in claim 1 , wherein the second expandable adhesive has, in each case proceeding from the joining points, an extent along the second constituent part of the structural element of at least 10 mm.

12. The system as claimed in claim 1 , wherein the second expandable adhesive forms a continuous element between the joining points.

13. A method for insulating a structural element in a motor vehicle, the method comprising the steps of:

providing a device having a carrier and a first expandable adhesive;

arranging the device on a first constituent part of the structural element;

arranging a second expandable adhesive on a second constituent part of the structural element;

joining the first constituent part and the second constituent part the structural element in order to form the structural element, wherein the device and the second expandable adhesive are arranged in a cavity between the constituent parts of the structural element; and

expanding the first expandable adhesive and the second expandable adhesive, as a result of which a cross section of the structural element is substantially completely filled by the device and the second expandable adhesive.

14. The method as claimed in claim 13 , wherein the second expandable adhesive is pumped or extruded onto the second constituent part of the structural element.

15. The method as claimed in claim 13 , wherein the method is carried out using a system comprising:

the structural element having the first constituent part and the second constituent part, the constituent parts being joined together at a first joining point and at a second joining point, and the structural element forming the cavity;

the device having the carrier and the first expandable adhesive, the carrier being arranged on the first constituent part of the structural element by way of a fastening element; and

the second expandable adhesive which is arranged on the second constituent part of the structural element,

wherein the first expandable adhesive and the second expandable adhesive are in a non-expanded state and are configured, and arranged, in such a way that, after the adhesives have been expanded, the device and the second adhesive substantially completely fill the cross section of the structural element.