| 摘要 |
PROBLEM TO BE SOLVED: To improve the pressure resistance of an oil side, in an oil cooler in which a first plate 3 and a second plate 4 are alternately arranged, an oil flow passage and a cooling water flow passage are alternately arranged between the plates, an inner fin 10 is placed at the oil flow passage 5, and an inner fin hole 10a is formed at the inner fin 10 in a position which coincides with an oil communication hole 1.SOLUTION: On an upper plate 8 arranged at the uppermost stage of a core 7, a protrusion 11 is formed at a position coinciding with the oil communication hole 1, and a diameter D1 thereof is made larger than a diameter D2 of the inner fin hole 10a of the inner fin 10. |
