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A valve flap device for an exhaust system of a motor vehicle, having at least one tubular valve housing with a flow cross section running perpendicular to a central axis and being formed by the inner geometry and a shaft which can turn about a valve axis with a valve flap mounted on the shaft, being

A valve flap device for an exhaust system of a motor vehicle, having at least one tubular valve housing with a flow cross section running perpendicular to a central axis and being formed by the inner geometry and a shaft which can turn about a valve axis with a valve flap mounted on the shaft, being mounted in the valve housing to close the flow cross section. The valve flap device can be made with low material input and at the same time with low fabrication expense at low costs. For this, the valve housing is made from a tubular blank of sheet metal with a tube diameter that is calibrated to the flow cross section at least partially by mechanical, plastic forming.

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1. A valve flap device for an exhaust system of a motor vehicle, comprising: a) at least one tubular valve housing with a flow cross section running perpendicular to a central axis and being formed by an inner geometry andb) a shaft which can turn about a valve axis with a valve flap mounted on the

1. A valve flap device for an exhaust system of a motor vehicle, comprising: a) at least one tubular valve housing with a flow cross section running perpendicular to a central axis and being formed by an inner geometry andb) a shaft which can turn about a valve axis with a valve flap mounted on the shaft, being mounted in the valve housing in the flow cross section to close the flow cross section,wherein the valve housing is made from a tubular pipe blank of sheet metal with a tube diameter that is calibrated to the flow cross section at least partially by mechanical, plastic forming, andwherein the shaft is biased via a first coupling disk and a spring relative to the valve housing in the direction of an open position and the shaft is coupled in form-fitting manner to a drive shaft by a second coupling disk disposed coaxially to the first coupling disk, wherein the two coupling disks have a play between 15° and 35° in a circumferential direction about the valve axis. 2. The valve flap device according to claim 1, wherein the calibrated inner geometry of the flow cross section has at least one basic inner diameter and in addition in the region of the valve flap a height of the flow cross section is reduced from the basic inner diameter in the direction of the valve axis, so that the pipe blank starting from the tube diameter is decreased and/or increased to the particular dimension of the inner geometry. 3. The valve flap device according to claim 1, wherein a) the shaft has a bearing surface for a mounting in a radial direction to the valve axis and a shaft shoulder for a mounting in an axial direction to the valve axis,b) a bearing housing is secured to the valve housing by form-fitting and/or bonding, in which the shaft is arranged,c) a bearing element is provided to mount the shaft in the bearing housing with a sliding bearing surface for the bearing surface and with an abutting surface for the shaft shoulder, the bearing element being able to move in both axial directions in the bearing housing, andd) a spring element is provided, by which the bearing element is biased in the axial direction against the shaft shoulder relative to the bearing housing. 4. The valve flap device according to claim 3, wherein the bearing housing is secured to the valve housing by resistance welding or by gluing or with rivets. 5. The valve flap device according to claim 4, wherein the valve flap is mounted in the valve housing in the axial and in the radial direction to the valve axis by a bearing pin, the bearing pin being arranged on the valve flap relative to the shaft. 6. The valve flap device according to claim 1, wherein an angular acceleration of the spring is greater than an angular acceleration of the drive shaft. 7. The valve flap device according to claim 1, wherein a) the valve flap has an essentially round or oval contour adapted to the inner cross section of the valve housing and is formed from a single or multiple-layered metal sheet, andb) the valve flap has at least one crimp and/or a curved zone in a marginal region that sticks out in at least one direction relative to a surface plane of the valve flap. 8. The valve flap device according to claim 7, wherein the curved zone has a bending edge running at least partly about the valve flap and the bending edge is fashioned as a sealing surface that can be placed against the valve housing. 9. The valve flap device according to claim 7, wherein the crimp and/or the curved zone is fashioned in mirror symmetry to the valve axis or in point symmetry to an intersection of the central axis and the valve flap. 10. The valve flap device according to claim 1, wherein the valve flap and/or the valve housing has a thickness between 0.6 mm and 3.0 mm. 11. The valve flap device according to claim 8, wherein the valve flap has a perforation and/or an opening or the valve flap has a base surface smaller than the flow cross section of the valve housing. 12. A system consisting of a valve flap device according to claim 1 and an exhaust system for an internal combustion engine or for a motor vehicle. 13. The valve flap device according to claim 2, wherein a) the shaft has a bearing surface for a mounting in a radial direction to the valve axis and a shaft shoulder for a mounting in an axial direction to the valve axis,b) a bearing housing is secured to the valve housing by form-fitting and/or material integrated bonding, in which the shaft is arranged,c) a bearing element is provided to mount the shaft in the bearing housing with a sliding bearing surface for the bearing surface and with an abutting surface for the shaft shoulder, the bearing element being able to move in both axial directions in the bearing housing, andd) a spring element is provided, by which the bearing element is biased in the axial direction against the shaft shoulder relative to the bearing housing. 14. A valve flap device for an exhaust system of a motor vehicle, comprising: a) at least one tubular valve housing with a flow cross section running perpendicular to a central axis and being formed by an inner geometry and b) a shaft which can turn about a valve axis with a valve flap mounted on the shaft, being mounted in the valve housing in the flow cross section to close the flow cross section, wherein the valve housing is made from a tubular pipe blank of sheet metal with a tube diameter that is calibrated to the flow cross section at least partially by mechanical, plastic forming,wherein the calibrated inner geometry of the flow cross section has at least one basic inner diameter and in addition in the region of the valve flap a height of the flow cross section is reduced from the basic inner diameter in the direction of the valve axis, so that the pipe blank starting from the tube diameter is decreased and/or increased to the particular dimension of the inner geometry,wherein a) the shaft has a bearing surface for a mounting in a radial direction to the valve axis and a shaft shoulder for a mounting in an axial direction to the valve axis, b) a bearing housing is secured to the valve housing by form-fitting and/or material integrated bonding, in which the shaft is arranged, c) a bearing element is provided to mount the shaft in the bearing housing with a sliding bearing surface for the bearing surface and with an abutting surface for the shaft shoulder, the bearing element being able to move in both axial directions in the bearing housing, and d) a spring element is provided, by which the bearing element is biased in the axial direction against the shaft shoulder relative to the bearing housing, andwherein the bearing housing is secured to the valve housing by resistance welding or by gluing or with rivets, wherein the valve flap is mounted in the valve housing in the axial and in the radial direction to the valve axis by a bearing pin, the bearing pin being arranged on the valve flap relative to the shaft, wherein the shaft is biased via a first coupling disk and a spring relative to the valve housing in the direction of an open position and the shaft is coupled in form-fitting manner to a drive shaft by a second coupling disk disposed coaxially to the first coupling disk, and wherein the two coupling disks have a play between 15° and 35° in a circumferential direction about the valve axis. 15. The valve flap device according to claim 14, wherein an angular acceleration of the spring is greater than an angular acceleration of the drive shaft, wherein a) the valve flap has an essentially round or oval contour adapted to the inner cross section of the valve housing and is formed from a single or multiple-layered metal sheet, and b) the valve flap has at least one crimp and/or a curved zone in a marginal region that sticks out in at least one direction relative to a surface plane of the valve flap, wherein the curved zone has a bending edge running at least partly about the valve flap and the bending edge is fashioned as a sealing surface that can be placed against the valve housing, and wherein the crimp and/or the curved zone is fashioned in mirror symmetry to the valve axis or in point symmetry to an intersection of the central axis and the valve flap. 16. The valve flap device according to claim 15, wherein the valve flap and/or the valve housing has a thickness between 0.6 mm and 3.0 mm, and wherein the valve flap has a perforation and/or an opening or the valve flap has a base surface smaller than the flow cross section of the valve housing.