| 摘要 |
PROBLEM TO BE SOLVED: To provide a resinous fuel tank capable of decreasing weight without increasing cost. SOLUTION: In the resinous fuel tank 100 molded by blow molding and having a hollow shape wherein an upper arm 51 and a lower arm 52 are assembled, an inner surface and an outer surface of at least a part of the upper arm 51 and the lower arm 52 are formed by superimposing a plurality of pyramidal parts 77 equipped with a plurality of pyramidal surfaces. At least one of the plurality of the pyramidal surfaces is an isosceles triangle. One of lines connecting each vertex on a bottom surface of the pyramidal part 77 and a top portion of the pyramid part 77 is formed in a first direction A along a cylindrical center portion 79 of the upper arm 51 and the lower arm 52 or a second direction B orthogonal to the first direction A. COPYRIGHT: (C)2011,JPO&INPIT |
