Abstract: A sound generation assembly unit, for an exhaust system of an internal combustion engine, includes a sound generation module (16) with a sound generation module housing to be arranged at an exhaust gas guide element (12) of the exhaust system (14). At least one loudspeaker unit (20) is arranged in the sound generation module housing (18). A rear volume module (30) includes a rear volume module housing (32) and a rear volume (34) formed in the rear volume module housing (32). The rear volume module housing (32) is connected or can be connected to the sound generation module housing (18) for the acoustic coupling of the rear volume (34) to the at least one loudspeaker unit (20).

Abstract: An exhaust gas flap includes a flap tube (12), a flap diaphragm (16) carried in the interior of the flap tube (12) on a pivot shaft (14) rotatable about a pivot axis (A), a pivot drive (30) and a coupling device (36) coupling the pivot shaft (14) to a drive shaft (34) of the pivot drive (30). The coupling device (36) includes a first coupling area (42) that positive-lockingly meshes with the drive shaft (34) and a second coupling area (44) that positive-lockingly meshes with the pivot shaft (14). A biasing element (78) is supported in relation to the coupling device (36) and is supported in relation to one shaft of the drive shaft (34) and the pivot shaft (14). The coupling device (36) is axially biased by the biasing element (78) towards the other shaft and is prestressed about the pivot axis in relation to the one shaft.

Abstract: A process for the analysis of the acoustic characteristic of an exhaust gas flap (10) for an exhaust system of an internal combustion engine, wherein the exhaust gas flap (10) includes a flap diaphragm (14), which is adjustable in a flap body (12). A measurement noise is applied to the exhaust gas flap (10). A disturbing noises originating at the exhaust gas flap (10) is detected and a disturbing noise time course (50) is generated. A disturbing noise frequency course (56) is generated based on the disturbing noise time course (50). The disturbing noise frequency course (56) is compared with a reference disturbing noise frequency course (58). The acoustic quality of the exhaust gas flap (10) is evaluated based on the comparison.

Abstract: An exhaust gas flap includes a flap tube (12), a flap diaphragm (16) carried in the interior of the flap tube (12) on a pivot shaft (14) rotatable about a pivot axis (A), a pivot drive (30) and a coupling device (36) coupling the pivot shaft (14) to a drive shaft (34) of the pivot drive (30). The coupling device (36) includes a first coupling area (42) that positive-lockingly meshes with the drive shaft (34) and a second coupling area (44) that positive-lockingly meshes with the pivot shaft (14). A biasing element (78) is supported in relation to the coupling device (36) and is supported in relation to one shaft of the drive shaft (34) and the pivot shaft (14). The coupling device (36) is axially biased by the biasing element (78) towards the other shaft and is prestressed about the pivot axis in relation to the one shaft.

Abstract: A process for the analysis of the acoustic characteristic of an exhaust gas flap (10) for an exhaust system of an internal combustion engine, wherein the exhaust gas flap (10) includes a flap diaphragm (14), which is adjustable in a flap body (12). A measurement noise is applied to the exhaust gas flap (10). A disturbing noises originating at the exhaust gas flap (10) is detected and a disturbing noise time course (50) is generated. A disturbing noise frequency course (56) is generated based on the disturbing noise time course (50). The disturbing noise frequency course (56) is compared with a reference disturbing noise frequency course (58). The acoustic quality of the exhaust gas flap (10) is evaluated based on the comparison.

Abstract: A sound generation assembly unit, for an exhaust system of an internal combustion engine, includes a sound generation module (16) with a sound generation module housing to be arranged at an exhaust gas guide element (12) of the exhaust system (14). At least one loudspeaker unit (20) is arranged in the sound generation module housing (18). A rear volume module (30) includes a rear volume module housing (32) and a rear volume (34) formed in the rear volume module housing (32). The rear volume module housing (32) is connected or can be connected to the sound generation module housing (18) for the acoustic coupling of the rear volume (34) to the at least one loudspeaker unit (20).