Patent ID: 8261815

Claim:
A heat exchanger for an internal combustion engine of a motor vehicle, comprising: a first box, a second box arranged spaced apart from the first box, a plurality of pipes by which the first box and the second box are fluidically connected, a chamber through which a coolant can flow and which is arranged between the first and second boxes and through which two or more of the plurality of pipes run, and a base comprising one or more through-openings for receiving the pipes and a border comprising a groove base, a first step, and a second step, wherein the border is arranged essentially in an edge region of the base and the groove base, the first step, and the second step are continuous around the periphery of the base; wherein the first step of the border lies adjacent to the groove base, is radially farther from a center of the base than the groove base, and recedes in a first direction from the groove base such that an upper surface of the first step is positioned below an upper surface of the groove base, and the second step of the border lies adjacent to the first step, is radially farther from the center of the base than the first step, and recedes in the first direction from the first step; and wherein the first direction is towards a center of the heat exchanger.