Abstract: The invention relates to an air-cooled exhaust gas heat exchanger, in particular exhaust gas cooler (1) for motor vehicles comprising channels (exhaust gas channels) which can be cross-flown by the exhaust gas of an internal combustion engine, between which ribs (4) for air cooling are arranged. According to the invention, the exhaust gas channels are embodied as tubes, in particular as flat tubes (3), which form the ribs (4) of a rib tube block (2) and the tube (3) has tube ends (3a) which are received in the collecting vessels (5) for the exhaust gas.

Abstract: Disclosed is a heat exchanger, particularly an exhaust gas heat exchanger for an internal combustion engine of a motor vehicle, comprising a housing jacket that is open at both ends, and a tube bundle which is inserted into said housing jacket and is penetrated by the hot exhaust gas. The aim of the invention is to produce said heat exchanger in an inexpensive and functionally safe manner. Said aim is achieved by the fact that only the tube bundle with the tube bottoms thereof, which are located on the front side, are made of metal while the housing jacket into which the tube bundle is inserted along with the tube bottoms is made of plastic.

Abstract: Disclosed is a heat exchanger, particularly an exhaust gas heat exchanger for an internal combustion engine of a motor vehicle, comprising a housing jacket (6) that is open at both ends, and a tube bundle which is inserted into said housing jacket and is penetrated by the hot exhaust gas. The aim of the invention is to produce said heat exchanger in an inexpensive and functionally safe manner. Said aim is achieved by the fact that only the tube bundle with the tube bottoms (2, 3) thereof, which are located on the front side, are made of metal while the housing jacket (6) into which the tube bundle is inserted along with the tube bottoms (23) is made of plastic.

Abstract: The invention relates to an assembly array for an air conditioner with a heating device, particularly for motor vehicles, comprising at least one housing in which air is guided in an at least partly predetermined flow path. The flow path also receives at least one heating device and at least one control device, wherein the heating device is arranged in a first flow path and the control device is partly arranged in a second flow path. The control device is arranged relative to the heating device in such a way that it provokes almost completely the through-flow of the heating device.

Abstract: A fluid friction clutch is provided having a disk and a housing concentrically surrounding the disk, with a working gap formed between the housing and the disk. The housing has a collecting channel for return of clutch fluid from the working gap to a storage chamber. Clutch fluid flows to the collecting channel due to the arrangement of grooves located in axially adjacent groove sections. The collecting channel is axially interposed between the groove sections, and the grooves are sloped so that the clutch fluid flows towards the collecting channel.