| 摘要 |
PROBLEM TO BE SOLVED: To provide a low cost bolt fixing construction which can prevent a projection of aluminum bur from a mounting hole, and a damage of periphery members or a degradation of sealing performance, furthermore, keep a bolt falling out force or the like of serration bolt when fixing the serration bolt to the mounting hole of tabular metallic ornament made of aluminum by press fitting. SOLUTION: The construction is characterized in that a serration bolt 31 is fixed in inserting and fitting by the press fitting to a mounting hole 26 arranged in a periphery 23 of outer metallic ornament 21 made of aluminum, in that the serration bolt 31 is equipped with a serration portion 33 in a periphery extending in an axial direction from a head portion 32 side with respect to a screw portion 34, and with a straight portion 35 with a periphery smooth without irregularities between the serration portion 33 and the screw portion 34, in that the serration portion 33 is shorter in length than a board thickness of the periphery 23 of the outer metallic ornament 21, and in that the outer diameter of the serration portion 33 is slightly bigger than the inner diameter of the mounting hole 26, and an interference being the difference is set to be 0.2-0.8 mm. COPYRIGHT: (C)2007,JPO&INPIT
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