| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent poor screw-thread fit of a screw, which is caused by corotation occurring when another screw is fastened.SOLUTION: An electronic control device 1 comprises: a housing 3 composed of a case 4 and a cover 5, for storing a printed wiring board 2 with an electronic component 6 being mounted; a plurality of screw holes 25a-25d formed in the case 4, for screwing lockscrews 34; and a plurality of screw insertion holes 35a-35d formed in the cover 5, for allowing shank parts of the lockscrews 34 to be inserted, in which the screw holes and the screw insertion holes are opposed one another and the lockscrews 34 are screwed with the screw holes and the case 4 and the cover 5 are fastened and fixed by the plurality of lockscrews. The screw insertion holes of the cover 5 other than one screw insertion hole of the cover 5, which allows the lockscrew to be inserted in order to be firstly screwed, are formed in shapes each having a larger clearance in a corotation direction with the cover than each clearance in each of other directions.</p> |
