| 摘要 |
A wave-shaped portion 5 b, the profile of which is formed into a wave-shape, is provided on the core plate 5 , and tubes are brazed to the core plate 5 under the condition that the tubes are inserted into holes 5 c formed in bent portions 5 a. Due to the above structure, even when a pitch between the tubes is reduced, it is possible to ensure a sufficiently high mechanical strength of the core plate 5 . Accordingly, the occurrence of a big difference in the mechanical strength between the core plate 5 and the tubes can be suppressed. Therefore, stress concentration at a joint portion of the core plate 5 and the tubes can be prevented. As a result, the mechanical strength of a radiator and the reliability (durability) of the joint portion of the core plate 5 and the tubes can be enhanced.
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