Holding device for an injection valve of an exhaust-gas burner, and exhaust-gas burner

1. A holding device for an injection valve of an exhaust-gas burner of a motor vehicle, said holding device comprising:

a receiving section that is shaped to receive a front end of the injection valve,

a cooling-water jacket that extends around the receiving section and that is shaped such that, after the holding device has been mounted on the exhaust-gas burner, said cooling-water jacket, together with a corresponding cooling-water jacket of the exhaust-gas burner, form a cooling-water chamber of the exhaust-gas burner, and

two connectors that are configured for connecting the cooling water jacket of the holding device to two burner-internal water lines of an ignition-plug cooling element of the exhaust-gas burner.

2. The holding device as claimed in claim 1 , wherein the cooling-water jacket of the holding device has two partitions which are formed such that the cooling-water jacket is divided by the two partitions into two spaces with flow transfer.

3. The holding device as claimed in claim 1 , wherein the holding device is a cast part.

4. The holding device as claimed in claim 1 , wherein the holding device has, in encircling fashion, a fully freestanding welding edge of thin-walled form.

5. The holding device as claimed in claim 1 , wherein, at an inner end of the receiving section, there is formed an annular shoulder which, together with an encircling wall adjoining said annular shoulder, forms a structural space reserve for receiving an outer acoustic or thermal shield for the injection valve.

6. The holding device as claimed in claim 1 , wherein the holding device has two cooling-water line connectors for the connection of two external cooling-water lines, wherein the cooling-water line connectors each comprise a sealing surface which is formed as an O-ring carrier.

7. An exhaust-gas burner for a motor vehicle, said exhaust-gas burner comprising:

a housing having an interior defining a combustion chamber,

an inlet line and an outlet line which are each fluidically connected to the combustion chamber, wherein, during operation of the exhaust-gas burner, the inlet line is configured to receive and transfer a fluid into the combustion chamber,

an injection valve which opens into the combustion chamber and by means of which a defined fuel quantity is injected with a defined injection frequency into the combustion chamber during operation of the exhaust-gas burner,

a holding device of claim 1 holding the injection valve, and

an ignition device which extends into the combustion chamber and which is configured to ignite and thus burn a fuel-process air mixture within the combustion chamber, wherein a gas formed during a combustion process flows through the outlet line and passes out of the exhaust-gas burner.

8. The exhaust-gas burner as claimed in claim 7 , wherein the holding device is, in a region of the front end of the injection valve, arranged with a sliding fit relative to a firmly fixed guide grille of the exhaust-gas burner.

9. A motor vehicle comprising the exhaust-gas burner as claimed in claim 7 .

10. A motor vehicle comprising the holding device as claimed in claim 7 .