JPH11237192A5 - - Google Patents

Description

[0007]
[Means for solving the problem]
Therefore, the present invention provides an EGR gas cooler for an internal combustion engine comprising: a cylindrical body having a cooling water inlet and a cooling water outlet formed on a side surface thereof for allowing cooling water to flow therethrough; end plates closing both ends of the body; a plurality of heat exchange tubes disposed within the body, each having both ends connected to a mounting hole in the end plate, and through which exhaust gas flows; and inlet and outlet cap-shaped members connected to both ends of the body and constituting a gas inlet and a gas outlet, respectively; the body, the end plates, and the heat exchange tubes are integrated in advance by brazing to form a cooler element, and the cap-shaped members are fixed to both ends of the cooler element by welding,
The end plate has a first bent portion formed by bending its outer periphery into a cylindrical shape, and this first bent portion fits onto the outer periphery of the end of the body, and the further tip side of this first bent portion is bent toward the outer periphery as a second bent portion, and the cylindrical opening of the cap-shaped member fits onto the outer periphery surface of the first bent portion, and the tip edge of the opening is welded to the second bent portion.

According to the configuration of this embodiment, similar to the previously described embodiment, the cap-shaped member 3 is welded to the relatively thick end plate 6, not to the thin body 5, and moreover, the welding is performed at a position away from the outer periphery of the body 5, which makes the welding work easier without causing holes in the body 5. Moreover, the cap-shaped member 3 is maintained in a provisionally assembled state to the cooler element 2 by fitting its cylindrical portion 3g into the first bent portion 6a of the end plate 6, which makes the welding work even easier.