Patent ID: 6612794
Filing Date: 2003-09-02
Classification: B23P,F16B,F16D

Abstract:
A fastening structure comprising:a bolt having a bolt head, a larger outer diameter portion extending in an axial direction of the bolt, a serration provided on an outer peripheral surface of the larger outer diameter portion, and a smaller outer diameter portion extending in the axial direction of the bolt and provided with a thread portion; and a mounting member having a flange portion in which a bolthole is formed and to which a brake disk is fixed by the bolt passing through the bolthole of the flange portion and a hole of the brake disk, a abutting surface of the bolt head abutting on a seat surface of the flange portion of the mounting member; and wherein the bolthole of the flange portion is comprised of a first enlarged part enlarged in a taper shape toward the seat surface of the flange portion, a center small diameter part engaged with the serration of the bolt, and a second enlarged part enlarged in a taper shape toward the brake disk side; and wherein the second enlarged part is longer in an axial direction of the bolthole than the first enlarged part.