DELIVERY DEVICE FOR DELIVERING A LIQUID ADDITIVE OUT OF A TANK, METHOD THEREFOR AND MOTOR VEHICLE HAVING A DELIVERY DEVICE

摘要

A delivery device for delivering a liquid additive out of a tank to an exhaust-gas treatment device includes a delivery duct with an overall volume and a pump disposed in the delivery duct. The delivery duct has a flexible wall portion, downstream of the pump in a delivery direction, with an outer side of the flexible wall portion situated opposite the delivery duct and bearing against a stop when a pressure in the delivery duct lies in a predefined operating pressure range. A spring element which is disposed on the outer side is constructed to deform the flexible wall portion in such a way that the overall volume is reduced in size when the pressure in the delivery duct is lower than a threshold pressure. A method for compensating a formation of ice in a delivery device and a motor vehicle having a delivery device are also provided.

主权项

1. A delivery device for delivering a liquid additive out of a tank to an exhaust-gas treatment device, the delivery device comprising:
a delivery duct having an overall volume; a flexible wall portion with an outer side disposed opposite said delivery duct; a stop against which said outer side bears when a pressure in said delivery duct lies in a predefined operating pressure range; a pump disposed in said delivery duct upstream of said flexible wall portion in a liquid additive delivery direction; and a spring element disposed on said outer side of said flexible wall portion and configured to deform said flexible wall portion to reduce a size of said overall volume of said delivery duct when a pressure in said delivery duct is lower than a threshold pressure.