Delivery device for delivering a reducing agent and motor vehicle having a delivery device

1. A delivery device for delivering a reducing agent from a reducing agent tank to an exhaust gas treatment device of an internal combustion engine, the delivery device comprising:

a rigid metal reducing agent line having a rigid metal wall;

a delivery pump which operates in a pulsed manner disposed in said reducing agent line, having a fixing and defining a delivery direction from the reducing agent tank to the exhaust gas treatment device; and

at least one vibration compensating device being an inflow compensating device disposed upstream of said delivery pump in said delivery direction, said inflow compensating device including an O-ring seal in said rigid metal reducing agent line, said O-ring seal interrupting said rigid metal reducing agent line for reducing a transmission of structure borne noise via said rigid metal wall of said rigid metal reducing agent line.

2. The delivery device according to claim 1 , which further comprises at least one element selected from the following group:

a metal base plate in which said rigid metal reducing agent line is at least partially formed and on which said delivery pump is fixed; and

a metal housing.

3. The delivery device according to claim 1 , further comprising:

a further inflow compensating device disposed upstream of said delivery pump in said delivery direction for reducing a transmission of structure borne noise via said rigid metal wall of said rigid metal reducing agent line, said further inflow compensating device including a bellows filled with reducing agent.

4. The delivery device according to claim 1 , wherein the reducing agent at least partially flows on an inside diameter surface of said O-ring seal.

5. The delivery device according to claim 1 , wherein said rigid metal reducing agent line has, in sections, an internal rubber-coated surface as an additional inflow compensator.

6. The delivery device according to claim 1 , wherein said O-ring seal divides said rigid metal reducing agent line into a first line section and a second line section of said rigid metal reducing agent line, said first line section and said second line section are separated from each other by said O-ring seal.

7. The delivery device according to claim 1 , wherein as an additional vibration compensator there is provided an outflow compensating device disposed downstream of said delivery pump in said delivery direction so as to reduce a transmission of structure borne noise via the rigid metal wall of the rigid metal reducing agent line, said outflow compensator includes a surface producing interference through which deflection and swirling flows in said reducing agent are created to reduce a pressure surge output by said delivery pump.

8. The delivery device according to claim 1 , wherein as an additional vibration compensating device there is provided a pump-internal compensator within said delivery pump, said pump-internal compensator includes a flexible stop which yields when a delivery piston of said delivery pump strikes against said flexible stop.

9. The delivery device according to claim 1 , wherein as an additional vibration compensator there is provided a structure borne noise compensator on said fixing of said delivery pump, said structure borne noise compensator includes a flexible fixing of said delivery pump.

10. The delivery device according to claim 6 , wherein said O-ring seal is in direct contact with said first line section and said second line section.

11. The delivery device according to claim 6 , wherein said O-ring seal is disposed between said first line section and said second line section in a direction of flow of reducing agent within said reducing agent line.

12. The delivery device according to claim 6 , wherein said O-ring seal defines an axial extent of said reducing agent line between said first line section and said second line section.

13. A motor vehicle, comprising:

an internal combustion engine;

an exhaust system having at least one exhaust gas treatment device associated with said internal combustion engine and configured for selective catalytic reduction; and

a delivery device according to claim 1 associated with said at least one exhaust gas treatment device.