| 摘要 |
<p>A plurality of insulator samples of different dimensions are subjected to multiple regression analysis to thereby induce an expression for estimating the amount of unevenness in wall thickness of an insulator(10); specifically, 0.01 × (0.141 × A - 0.140 × D - 0.285 × B - 6.124 × C + 1.105 × E + 17.527), where A is an overall length of the insulator (10), B is the outside diameter of a rear trunk portion (18) of the insulator (10), C is the diameter of a large-diameter portion (110) of the axial bore (12) of the insulator (10), D is the length of the large-diameter portion (110), and E is the diameter of a small-diameter portion (120) of the axial bore (12). The insulator (10) is designed such that the amount of unevenness in wall thickness thereof estimated through calculation by this expression is less than 0.07 mm.</p> |
