Mahle International Gmbh

Bernhard Schwalk

Hartmut Sauter

Andreas Grüner

Hans-Peter Drespling

Robert Sendor

Rudiger Knauss

Jörg Dittmann

Harald Rieger

Holger Peters

Rüdiger Knauss

The present invention relates to an exhaust gas cooler (), in particular for an exhaust gas recirculation system of an internal combustion engine, preferably of a motor vehicle, comprising an exhaust gas inlet () which is connected in a communicating manner with an inlet chamber (), an exhaust gas outlet () which is connected in a communicating manner with an outlet chamber (), a plurality of exhaust gas pipes () which are configured as flat pipes, extend parallel to each other through a coolant chamber () and are connected in a communicating manner on one side to the inlet chamber () and on the other side to the outlet chamber (), a coolant inlet () which is connected in a communicating manner to the coolant chamber (), and a coolant outlet () which is connected in a communicating manner to the coolant chamber (). The exhaust gas pipes () have on mutually opposite sides () a plurality of outwardly projecting protrusions () which are spaced apart from each other in the longitudinal direction () of the exhaust gas pipes (). A simplified cooling effect can be achieved if, with in each case two adjacent exhaust gas pipes (), the protrusions () of one exhaust gas pipe () bear in each case directly against the other exhaust gas pipe () at a distance in the longitudinal direction () of the exhaust gas pipes () from the nearest protrusion () of the other exhaust gas pipe ().

Exhaust gas cooler

The invention relates to a valve arrangement () for an exhaust gas recirculation device of an internal combustion engine, especially in a motor vehicle. Said valve arrangement () comprises a first valve () which is used to control a first gas path () and is mobile between an open position, a closed position, and at least one intermediate position. The inventive valve arrangement () also comprises a second valve () for controlling a second gas path () which is separate from the first gas path (), said second valve being mobile between an open position, a closed position and at least one intermediate position independently from the first valve (). The valve arrangement () also comprises a common housing () which contains both valves () and through which the two gas paths () are guided.

Valve arrangement for an exhaust gas recirculation device

The invention relates to an exhaust gas recirculation device () for an internal combustion engine (), especially in a motor vehicle, said device comprising an exhaust gas recirculation line () and an exhaust gas cooler () which is built into the exhaust gas recirculation line () and connected to a cooling circuit () operating by means of a liquid coolant. The exhaust gas recirculation cooler () comprises a cooler housing () which comprises at least one exhaust gas inlet (), an exhaust gas outlet (), a coolant inlet () and a coolant outlet (), and through which a coolant flows. In order to be able to improve the adjustment of the cooling power, the exhaust gas recirculation cooler () contains, in the cooler housing () thereof, a first cooling tube arrangement () and a second cooling tube arrangement () which enables a larger heating flow between the exhaust gas and the coolant than the first cooling tube arrangement ().

Exhaust gas recirculation device

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Stuttgart, Germany

Bernhard Schwalk