Waste gas heat exchanger
AssigneeBehr GmbH & Co.
InventorsArndt Birkert, Hans Glockl, Knut Haarscheidt
Life of this patent
Estimating the term…
Abstract
The invention relates to a heat exchanger, especially a heat exchanger for motor vehicles, comprising a bank of tubes through which a gaseous medium flows and around which a liquid coolant flows. The ends of said tubes are received in tube plates and are connected to the same in a material fit. The inventive heat exchanger also comprises a housing jacket which surrounds the bank of tubes and is connected, at the end thereof, to the tube plates. A coolant flows through said housing jacket. The tubes, tube plates and housing jacket are produced from a heat-resistant and corrosion-resistant metallic alloy. According to the invention, the housing jacket comprises at least one surrounding expansion flange.
Claims13
A heat exchanger, in particular an exhaust gas heat exchanger for motor vehicles, having a bank of tubes through which a gaseous medium flows and around which a liquid coolant flows, and the tubes of which are held by their tube ends in tube plates and are connected thereto with a cohesive material joint, and having a housing jacket which surrounds the bank of tubes and is connected on the end side to the tube plates with a cohesive material joint and through which the coolant flows, tubes, tube plates and housing jacket being produced from a heat-resistant and corrosion-resistant metallic alloy, wherein the housing jacket has at least one encircling expansion bead.
A method for producing an expansion bead in a tubular housing jacket, in particular having a noncircular cross section, characterized by the following method steps:
- provision of a housing jacket which is cut to size,
- insertion of the housing jacket into an IHF mold and closing the mold,
- filling the mold and the housing jacket with a liquid pressure medium,
- deformation of the housing jacket by building up internal high pressure and producing a preliminary form of the bead (first deformation step),
- reduction of the internal high pressure and
- production of the final form of the expansion bead by axial compression of the housing jacket in a second deformation step.
Dependencies are inferred from the claim text.