METHOD FOR FASTENING SUBFRAME TO MOTOR VEHICLE BODY BY MEANS OF FASTENING BOLTS AND SUBFRAME RIGID COLLAR FOR MOTOR VEHICLE

摘要

The fastening is performed by using the fastening bolt of the conventional mass-produced car, the fastening method capable of obtaining "Resonance frequency" of the aimed body and the sub frame rigid collar for car used for the fastening method, are provided by the tightening work with the conventional specified torque, and only by simple work of interposing the sub frame rigid collar for car, without need the work of any special processing. Before the charging of fastening bolt 10 into the through-hole 5 of the sub frame 4, Fastening bolt 10 is charged from the treaded portion 11 sides through the fastening bolt through-hole 24 of the cylindrical portion 23 being as the collar body of the sub frame rigid collar for car 20, and then the fastening bolt 10 is set while screwing the tip side of the screw portion 11 into the screw hole 2 of the monocoque body 1, the fastening bolt 10 is fastened with the specified torque, the tapered outer peripheral portion 21 of the sub frame rigid collar for car 20 is charged into the introduction hole 3, the tapered outer peripheral portion 22 is charged into the through-hole 5, the tapered outer peripheral portion having the diameter larger than the inner diameter of the introduction hole 3 and the through-hole 5 of both tapered outer peripheral portions 21 and 22, is compressed and press-fitted so as to deform the outer peripheral portion by plasticity being as the property of the molding material of the sub frame rigid collar for car 20, and the deformed portions 21b and 22b of the tapered outer peripheral portion 21 and 22 are fastened by press-attaching and press-fitting the deformed portions between the inner periphery surfaces 3a and 5a of the introduction hole 3 and the through hole 5 and the outer peripheral surfaces 10a of the fastening bolt 10.