Wavy fin for EGR cooler

Not seen cooler wave pin according to the present invention, the vertical portion and the horizontal portion planar shape doedoe connected alternately formed in a curved shape to fulfill the wave pattern, not seen mounted in a gas tube of the cooler, the length direction of the vertical portion At least one notch is formed in the end. Not seen cooler wave pin according to the present invention, as well as may be the length expanding a certain level in a direction when heated to a high temperature as in the height direction also can be thermal expansion certain level nor be largely generated thermal stress, into the gas tube It has the advantage that the exhaust gas can flow in the width direction of the gas tube it is possible to maximize the exhaust gas cooling efficiency.