| 摘要 |
A heat exchanger is provided for heat transfer between a first fluid, particularly charge air or an exhaust gas, and a second fluid, particularly a coolant, which has: a block for the separated and heat-exchanging guiding of the first and second fluid, the block which has a number of flow channels through which the first fluid can flow, at least one box which is assigned to the block and is flow-connected to the flow channels, and at least one base, which is provided with one or with more through openings for feeding through the flow channels between the block and the box, whereby at least one through opening is formed as a passage with a collar. The invention provides that the collar has a near-bottom section and an end-side section, whereby a wall cross section of the end-side section is smaller than a wall cross section of the near-bottom section and between the near-bottom and end-side section at least one shoulder is disposed, which has a shoulder contour running transverse to the contour of the near-bottom section and/or the end-side section and whereby the end-side section is inclined away from a passage axis. A use and manufacturing process are also provided.
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