Heat exchanger

Abstract

A heat exchanger comprising: a plurality of tubes inside of which a fluid passes; fins which are joined to the outer surfaces of the tubes and promote heat exchange between a fluid passing around the tubes and the fluid passing through inside the tube; and tank sections comprising core plates having insertion holes formed for the tubes to be inserted therein and tank bodies having the core plates joined thereto for distributing or collecting the fluid to be passed through the tubes; the tube comprises a first and a second tube plates joined in opposition to each other and inner fins disposed between the first and second tube plates, and that the portion of the tube to be inserted into the insertion hole of the core plate has generally the same outer shape as the periphery of the insertion hole, and that the portions of the first and second tube plates not to be inserted into the insertion hole of the core plate have overlapping sections which overlap each other in laminating direction of the tubes.

Description

technical field [0001] The present invention relates to a heat exchanger, and more particularly, to a heat exchanger for a supercharger in an internal combustion engine. Background technique [0002] Conventionally, a heat exchanger for a supercharger in an internal combustion engine is used to cool thermally expanded intake air in order to increase the charging efficiency of the intake air, and such a heat exchanger is known, for example, based on Japanese Patent Laid-Open No. 2002-286394, Japanese Patent Publication No. 2002-286394 discloses a heat exchanger having a pair of tanks, a plurality of tubes through which pressurized air passes, and cooling fins for enhancing heat dissipation, the above parts being brazed together Soldered in one unit. In this heat exchanger, the tank includes a tank body and a core plate, and tubes are inserted through insertion holes formed in the core plate. [0003] In this heat exchanger, in order to further improve heat exchange efficien...

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that a gap may be formed at the fitting portion 201f, and a brazing failure may be caused in the brazing portion.

[0005] Also, there is a problem that, as shown in FIG. 16, a step 201g is generated due to the formation of the fitting portion 201f, and the step increases the distance between the tube 201 and the open edge of the tube insertion hole 202 through which the tube 201 is inserted. gaps, causing brazing failure

[0006] Also, when a heat exchanger of a larger size is used, it is difficult to obtain sufficient positioning accuracy of the individual parts, and therefore, it is necessary to use a jig or the like for adjustment, which leads to another problem of increasing the number of processing steps

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