| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a liquid leakage preventive structure which compatibly achieves both of atmospheric openness and leakage prevention of a coolant via a communication opening opened to an overflow passage at occurrence of a liquid shuddering phenomenon, and which can be manufactured easily. <P>SOLUTION: In a configuration which is composed of a water filling neck erected on a ceiling wall upper surface of a tank body and having an opened water filling port and a cap mounted to a tip of the water filling neck, and which is formed with an overflow passage in a groove shape in a vertical direction of the water filling neck with a part of an outer circumferential wall of the water filling neck recessed in an inner radial direction of the water filling port, the water filling neck is formed with a communication opening which is opened in a radial direction on an upper end of a passage forming wall forming the overflow passage, and connects the inside and outside of the water filling neck, the cap is formed with a cylindrical shield wall which is protruded from a ceiling wall lower surface thereof and is extended to a lower side than a lower end of the communication opening, and a flow passageway is formed as the shield wall and the passage forming wall are faced. <P>COPYRIGHT: (C)2013,JPO&INPIT |
