| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an air passage structure of a reservoir tank, having a simple constitution, and highly preventing leakage of cooling water. <P>SOLUTION: The air passage P provided in a cap portion of the reservoir tank is constituted by communicating a first passage P1, a second passage P2 and a third passage P3 in series in this order. The first passage P1 is constituted of a first passage lower part 121 projected inside a filling port 12 and a seal plate 2, and extends in the horizontal direction. The second passage P2 is constituted of a second passage upper part 311 formed in a groove shape in a lid portion 31 of the cap, and the seal plate 2, and extends in the direction along the circumferential edge of the cap 3. The third passage P3 is formed in the filling port 12 portion and integrated with a tank body so as to have a passage extending in the vertical direction, and one end of the third passage P3 is communicated with an external space of the tank. Through-holes 22 for communicating these passages with each other are formed in the seal plate 2. A part at which the second passage P2 and the third passage P3 are communicated with each other is provided inside the circumferential edge of the filling port 12. <P>COPYRIGHT: (C)2012,JPO&INPIT |
