| 摘要 |
A heat exchanger for vehicles comprises firstly a heat-exchanger assembly (1) consisting of flat liquid-conveying tubes (2) and surface-enlarging means (3), secondly an inlet tank (4), and thirdly an outlet tank. The inlet tank and the outlet tank (4) have a connection plate (5) with a number of connection holes (7) for the tubes (2). At each hole (7), the plate (2) has a projecting connecting sleeve element (8). Each tube (2) has at its ends a widened main portion (9) which is accommodated on said connecting sleeve element (8). A rounded transitional area (14) is formed between the connection plate (5) and each connecting sleeve element (8), and the main portion (9) is inserted in the connecting sleeve element (8) and is applied with its outside against the inside of the connecting sleeve element (8). Each tube (2) has at its ends an end portion (13) which is widened in relation to the main portion (9), merges with the main portion (9) and is applied against the transitional area (14). In a method of producing such a heat exchanger, the widened end areas (9, 13) of the tubes (2) are inserted in the connecting sleeve elements (8) and are widened further in such a manner that each tube end (16) is applied against the transitional area (14) between the plate (5) and the respective connecting sleeve element (8). <IMAGE> |
