Knee impact guard for motor vehicles
A knee impact guard for a motor vehicle includes an energy-absorbing foam section, a supporting element, and projections and recesses. The energy-absorbing foam section can be arranged substantially across a longitudinal axis of the motor vehicle. The supporting element is fastenable to the body structure of the motor vehicle, and the energy-absorbing foam section is held on the supporting element. The foam section and the supporting element are assembled with one another by the projections and the recesses complementary to and confronting one another.
1 . A knee impact guard for a motor vehicle having a body structure, comprising:
an energy-absorbing foam section which can be arranged substantially across a longitudinal axis of the motor vehicle;
a supporting element fastenable to the body structure of the motor vehicle, wherein the energy-absorbing foam section is held on the supporting element; and
projections and recesses, wherein the foam section and the supporting element are assembled with one another by the projections and the recesses complementary to and confronting one another.
2 . The knee impact guard according to claim 1 , wherein the supporting element has projections configured as ribs which engage in recesses formed in the foam section.
3 . The knee impact guard according to claim 2 , wherein the projections and recesses are of elongated shape.
4 . The knee impact guard according to claim 3 , wherein the projections and recesses can be arranged substantially transversely across the longitudinal axis of the motor vehicle.
5 . The knee impact guard according to claim 4 , wherein the supporting element is configured as a profile element.
6 . The knee impact guard according to claim 5 , wherein the supporting element is formed from one of aluminum and magnesium.
7 . The knee impact guard according to claim 6 , wherein the projections and/or the recesses are deformable.
8 . The knee impact guard according to claim 7 , wherein the supporting element and the foam section are assembled to one another through additional fixation devices.
9 . The knee impact guard according to claim 8 , wherein the fixation devices are formed by protrusions which penetrate locally into the foam section.
10 . The knee impact guard according to claim 9 , wherein the supporting element can be joined to a cross member of the motor vehicle.
11 . The knee impact guard according to claim 10 , further comprising a dish-shaped holder by which the supporting element can be joined to the body structure of the motor vehicle.
12 . The knee impact guard according to claim 11 , wherein the foam section has a cover on a side remote from the supporting element.
13 . A method for energy absorption in case of a collision of a knee of a motor vehicle occupant against a part of a motor vehicle which is in front of the knee, comprising:
in a first absorption phase, deforming a foam section which is arranged substantially across a long axis of the motor vehicle, and is mounted on a supporting element, the supporting element being joined to a body structure of the motor vehicle; and
in a second absorption phase, deforming projections and/or recesses complementary to and facing one another, through which the supporting element and the foam section are assembled together.
14 . The method according to claim 13 , further comprising: in an absorption phase deforming the supporting element.
15 . The method according to claim 14 , wherein in the absorption phase further deforming a holder, by which the supporting element is joined to the body structure of the motor vehicle.