Robert Bosch

Christoph Waletzek

Ralph Schmidt

Markus Ulrich

Peter Holek

The invention relates to a pumping device () for supplying an exhaust gas aftertreament system () of an internal combustion engine with a reductant (), in particular with a urea-water solution, in order to reduce nitrogen oxides (NOx) in the exhaust gas flow of the internal combustion engine, comprising a motor () for driving two pumps (). According to the invention, the first pump () is connected to the motor () by means of a first coupling, and the second pump () is connected to the motor by means of a second coupling. In a preferred embodiment, the couplings are designed as freewheel couplings () acting in opposite directions, so that a switch between a 'pumping state' and a 'suck-back state' can be made by simply reversing the direction of rotation of the motor ().

Pumping device for supplying an exhaust gas aftertreatment system of an internal combustion engine with a reductant, and method

A fluid delivery device, in particular for delivering exhaust gas posttreatment media, such as a urea-water solution, for an internal combustion engine, includes a movable work wall, in particular a work diaphragm. A work chamber is provided for a fluid that is to be delivered via at least one fluid connection. The work chamber is capable of being increased and decreased in size by means of the movable work wall, the at least one fluid connection, and at least one mechanism for moving the work wall upon an intake stroke and a compression stroke. The at least one mechanism is embodied such that the force for moving the work wall both in the intake stroke and in the compression stroke includes a Lorentz force.

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Stuttgart, Germany

Christoph Waletzek