Patent ID: 7954596

Claim:
A multilayered acoustically and thermally effective insulation of an internal combustion engine of a motor vehicle comprising at least two layers having different flow resistance values and being connected with one another over the full area thereof, comprising: a first layer in contact therewith having an air flow resistance within a range of from 50 to 150 kNs/m 4 , a layer thickness of from 5 to 50 mm and a basis weight of from 0.04 to 2.5 kg/m 2 ; a second layer subsequent to the first layer and facing away from the engine having an air flow resistance within a range of from 200 to 600 kNs/m 4 , a layer thickness of from 0.5 to 8 mm and a basis weight of from 0.2 to 5 kg/m 2 ; an air gap of at least 1 mm between the engine and the first layer, and wherein the difference of the air flow resistance values of the second layer minus the first layer is at least 150 to 550 kNs/m 4 , the difference of the layer thickness values of the first layer minus the second layer is at least 4.5 to 49.5 mm, and the difference of the basis weights of the second layer minus the first layer is at least 0.16 to 4.96 kg/m 2 .