The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 26, 2016
Filed:
Dec. 27, 2011
Markus Ulrich, Rudersberg, DE;
Christoph Waletzek, Stuttgart, DE;
Markus Ulrich, Rudersberg, DE;
Christoph Waletzek, Stuttgart, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
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 ().