Abstract: The invention relates to a flat tube of a heat exchanger in heating installations or of a radiator of a motor vehicle which is folded from a flat sheet metal of aluminum or an aluminum alloy and across the respective flow of which spacers or the flat sides of the flat tube brazed or soldered to one another are distributed, which are designed as dents of the flat sides of the flat tube on one or both sides. According to the invention it is provided that in the same flow in addition to the spacers embossments freely projecting into the flow are distributed as turbulence-generating flow obstacles at least at one flat side of the flat tube.

Abstract: The invention relates to a tube connection between a collector (2) of a motor vehicle heat exchanger and a line (16) using a connecting sleeve (14) in which the free end (32) of the line (16) engages in a positive manner. An annular seal (28) is accommodated in the annular gap (22) between the inner surface (24) of the connecting sleeve (14) and the outer surface (26) of the line (16). An outer flange (38) is provided on the free end (40) of the connecting sleeve (14), and a buckled outer bead (36) is formed on the line (16). When the tube connection is completely assembled, said bead is tightened against the outer face (41) of the outer flange (38) by a clamping device (42). The seal (28) forms an insertion sleeve (44). A sealing element (48) is formed on the insertion sleeve in the peripheral area thereof situated close to the collector, and a sealing flange (46) projects from the peripheral area of the insertion sleeve situated away from the collector.

Abstract: The invention relates to a flat tube heat exchanger with two or more flows for motor vehicles with a deflecting (or reversing) bottom for deflecting (or reversing) adjacent flows of the flat tubes. According to the invention, it is provided that the deflecting bottom is resolved into deflecting bowls individually assigned to each flat tube, which bowls are connected to one another only via their connection to the respectively assigned flat tubes. The invention also relates to a process for manufacturing such a flat tube beat exchanger by pulling off, straightening and cutting into sections the flat tubes from a coil, mechanically pre-assembling the flat tube heat exchanger from its structural parts including the flat tubes and soldering or brazing. Here, it is provided that the deflecting bowls are mechanically pre-assembled with the flat tubes after they have been cut into sections and before pre-assembling the flat tube heat exchanger with the flat tubes.

Abstract: The invention relates to a distributing/collecting tank (distributor/header case) of aluminum or an aluminum alloy of an at least dual flow (double-flow) brazed evaporator of a motor vehicle air conditioning equipment, wherein the case comprises a tube bottom and a cap (28), which supplement each other at least in the direction of the narrow cross-section to the case, and in its longitudinal extension direction corresponding to the number of flows at least a longitudinal partition, wherein at least one case wall on the front side is formed by a separate end piece (62) being in close contact to each adjacent longitudinal partition and at least one case wall is provided with the refrigerant inlet (14).

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.

Abstract: The invention relates to a header of a heat exchanger for motor vehicles with an at least two-part design of the header of a tube bottom and a cap, which together form, optionally with at least one further component, the housing of the header. According to the invention, it is intended that the cap and/or the tube bottom together with the respective housing wall extending around is an integral diecast part.