Motor vehicle flat tube heat exchanger with flat tubes retained on collars of a tube bottom

Abstract

The invention refers to a flat tube heat exchanger for motor vehicles in which the flat tubes leaving an internally projecting free end as an overhand are inserted in collars which extend to the inside and which are opened up in the form of a tulip of slits of a tube bottom of a header case for the internal heat exchange fluid and the header case comprises at least one partition dividing off various chambers of the header case and intersecting the flat tubes, the partition reaching at least down to the ground of the tube bottom adjacent to the flat tubes or to the collars extending to the inside and comprising in the region of the free ends of the flat tubes in the header case recesses overgripping the free ends, and the free ends of the first tubes in the header case being arranged with an undercut with respect to the collars opened up as a tulip which locks the flat tubes against being pulled out of the tubes bottom. According to the invention it is provided that the free ends of the flat tubes are pressed into the ground of the respectively allocated recess with compensation for tolerances such that the material displacement of the wall of the flat tube forms the undercut at its free end.

Dependencies are inferred from the claim text.