Patent ID: 9062634
Filing Date: 2015-06-23
Classification: F02M,F28D,F28F

Abstract:
1. An EGR cooler comprising: a core; a housing which houses the core; the housing comprising a wall which extends lengthwise of the housing and has a transverse cross section enclosing an interior which extends lengthwise through the housing from a first open end to a second open end; the core comprising multiple straight tubes which extend lengthwise through the interior and are spaced apart from each other; a header plate having a continuous perimeter margin disposed against the wall of the housing at the first open end and a central region which is bounded by the continuous perimeter margin and overlies the first open end; the central region comprising multiple through-openings each receiving an open end of a respective tube, each through-opening presenting a wall surface surrounding, and having dimensional clearance to, an outside surface of a respective tube along a lengthwise segment of the respective tube; joining material which extends continuously around the lengthwise segment of each tube to join the lengthwise segment of each tube with the surrounding wall surface of the respective through-opening and create a fluid-tight seal between the tube and the through-opening; the central region comprising a flat zone, of constant nominal thickness as measured lengthwise of the housing between opposite faces of the central region, the flat zone containing at least one endless groove which circumscribes the through-openings while reducing the constant nominal thickness of the flat zone along the groove without creating an opening through the flat zone between opposite faces of the central region.