| 摘要 |
PROBLEM TO BE SOLVED: To prevent loosening of a screw portion caused by loosening factors such as gas pressure, without increasing the dimension of the screw portion or increasing initial fastening torque. SOLUTION: A spring member 30 is disposed between a tank body 12 and a valve unit 13 screwed with each other. The spring member 30 is disposed in a state of being deformed larger than relative displacement between the tank body 12 and the valve unit 13 caused by the loosening factors including gas pressure in the tank body 12. Thus, a fastening force Fsp by the spring member 30 does not become 0 because of the loosening factors, and the loosening of each of the screw portions 17, 21 can be prevented. Further, the spring force may be smaller than a pressing force Fp by the gas pressure, the initial fastening torque can be reduced, the strength required to the screw portions 17, 21 is reduced, the dimensions of the screw portions 17, 21 can be reduced, and a large capacity of a tank can be secured. COPYRIGHT: (C)2007,JPO&INPIT
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