Patent ID: 9127628
Filing Date: 2015-09-08
Classification: F02M

Abstract:
1. A flange fastening structure comprising: bolts; a first flange made of metal and provided on a first member; a second flange made of plastic and provided on a second member; stepped nuts provided in the second flange and each having a large-diameter portion in contact with the second flange and a small-diameter portion extending from the large-diameter portion; the second flange having a surface facing the large-diameter portion and facing away from the first flange, the second flange having openings through which the small-diameter portions extend, and the second flange having at least one raised portion protruding from the surface in a direction extending away from the first flange and at a location that is spaced apart from an edge of the openings, the at least one raised portion being made of plastic, a height of the at least one raised portion being set such that the at least one raised portion pressed with the large-diameter portion is deformed by a predetermined amount when the first flange and the second flange are fastened together with the bolts and the nuts; and the small-diameter portion of each of the nuts contacting the first flange to limit fastening positions of the nuts and the bolts corresponding to the nuts respectively when the first flange and the second flange are fastened together with the bolts and the nuts.