Abstract: A thermoelectric module (13), for converting thermal energy into electric energy, includes a plurality of leg pairs (26), which have each a p-doped semiconductor leg (27) and an n-doped semiconductor leg (28), which are contacted with one another electrically via metal bridges (29). At least one electrically insulating ceramic plate (30), which is arranged on a hot side (18) of the thermoelectric module (13) or on a cold side (19) of the thermoelectric module (13) and is flatly in contact with metal bridges (29) associated with this side (18, 19) and is fastened thereto. The pressure stability of the thermoelectric module (13) can be improved if the respective ceramic plate (30) is segmented, so that a plurality of ceramic plate segments (31) are arranged next to each other, which are each flatly in contact with a plurality of metal bridges (29) and are fastened thereto.

Abstract: A heat exchanger, for an exhaust gas system (5) of an internal combustion engine (1), includes a thermoelectric module (13), converting thermal energy into electrical energy, having a hot side (17) and a cold side (18). A cooling pipe (15), for a cooling fluid, is arranged on the cold side (18) and a heating pipe (16) for a heating fluid, is arranged on the hot side (17). The cooling pipe (15) and the heating pipe (16) are stacked with the thermoelectric module (13) in a stacking direction (19) and form a stack (20). The heat transfer within the stack (20) is improved with at least one of the pipes (15, 16) being curved toward the thermoelectric module (13) at an outer pipe face (26) and with the thermoelectric module (13) curved toward the pipe (15, 16) at an outer module face (27) facing the particular pipe (15, 16).

Abstract: A heat exchanger, for an exhaust gas system (5) of an internal combustion engine (1), includes a thermoelectric module (13), converting thermal energy into electrical energy, having a hot side (17) and a cold side (18). A cooling pipe (15), for a cooling fluid, is arranged on the cold side (18) and a heating pipe (16) for a heating fluid, is arranged on the hot side (17). The cooling pipe (15) and the heating pipe (16) are stacked with the thermoelectric module (13) in a stacking direction (19) and form a stack (20). The heat transfer within the stack (20) is improved with at least one of the pipes (15, 16) being curved toward the thermoelectric module (13) at an outer pipe face (26) and with the thermoelectric module (13) curved toward the pipe (15, 16) at an outer module face (27) facing the particular pipe (15, 16).

Abstract: A device for exhaust-gas treatment near an engine includes an annular structure and a guide structure disposed in an exhaust line. An inner wall forms an inner flow passage and an outer flow passage in the annular structure. The inner wall and the guide structure form a gap in such a way that only a limited secondary flow of the exhaust gas is conducted through the inner flow passage. A motor vehicle having the device is also provided.

Abstract: A heat exchanger (9), of e.g. an exhaust gas system (5) for an internal combustion engine (1), includes a thermoelectric generator (12) having a hot side (13) and a cold side (14) and including a heating tube (15) on a hot side of a heating device (10), and a cooling tube (16) on a cold side of a cooling device (11). The heating tube and the cooling tube are stacked on one another and form a tube stack (18), with the heating tube and the cooling tube extending parallel to one another in a longitudinal direction (19) of the tube stack. For energy efficiency, a housing (21) of the heat exchanger has a jacket (23) with an integral re-tensioning section (25) that is resiliently adjustable between a relaxed state and a tensioned state. The pre-tensioning section generates a pre-tensioning force (26) pressing the tube stack in a stacking direction (17).

Abstract: A mixing and/or evaporating device (12) for an exhaust system (5) of a combustion engine (1), in particular of a motor vehicle, includes a support body (19), which encloses a flat cross section through which a flow can flow running transversely to the axial direction (20) of the device (12) in the circumferential direction (32). The support body (19) comprises two long side walls (21, 22) located opposite each other and two short side walls (23, 24) located opposite each other, wherein the short side walls (23, 24) each connect the two long side walls (21, 22) with each other. At least on one long side wall (21, 22) at least on one axial end (26, 27), a plurality of guide blades (25) is arranged. The guide blades (25) stand away in a direction of the other long side wall (21, 22) and are angled relative to the axial direction (20).

Abstract: A heat exchanger (9), of e.g. an exhaust gas system (5) for an internal combustion engine (1), includes a thermoelectric generator (12) having a hot side (13) and a cold side (14) and including a heating tube (15) on a hot side of a heating device (10), and a cooling tube (16) on a cold side of a cooling device (11). The heating tube and the cooling tube are stacked on one another and form a tube stack (18), with the heating tube and the cooling tube extending parallel to one another in a longitudinal direction (19) of the tube stack. For energy efficiency, a housing (21) of the heat exchanger has a jacket (23) with an integral re-tensioning section (25) that is resiliently adjustable between a relaxed state and a tensioned state. The pre-tensioning section generates a pre-tensioning force (26) pressing the tube stack in a stacking direction (17).

Abstract: A mixing and/or evaporating device (12) for an exhaust system (5) of a combustion engine (1), in particular of a motor vehicle, includes a support body which encloses a cross section of the device (12) through which a flow can flow and which runs transversely to the axial direction (20) of the device (12) in the circumferential direction. The support body (19) has at least one guide blade (25, 28) which extends away transversely to the axial direction (20). An improved efficiency is obtained with the guide blade (25) having a roof-shaped profile (29), including two guide surfaces (30, 31) that are interconnected via a ridge (32) or apex.

Abstract: A thermoelectric module (13), for converting thermal energy into electric energy, includes a plurality of leg pairs (26), which have each a p-doped semiconductor leg (27) and an n-doped semiconductor leg (28), which are contacted with one another electrically via metal bridges (29). At least one electrically insulating ceramic plate (30), which is arranged on a hot side (18) of the thermoelectric module (13) or on a cold side (19) of the thermoelectric module (13) and is flatly in contact with metal bridges (29) associated with this side (18, 19) and is fastened thereto. The pressure stability of the thermoelectric module (13) can be improved if the respective ceramic plate (30) is segmented, so that a plurality of ceramic plate segments (31) are arranged next to each other, which are each flatly in contact with a plurality of metal bridges (29) and are fastened thereto.