| 摘要 |
PROBLEM TO BE SOLVED: To provide an axle spring seat for an axle box support device with a structure allowing manufacture by jointing of two aluminum members, and also to provide a method of manufacturing therefor. SOLUTION: This axle spring seat is provided with the pipe-like first aluminum member 1 and the plate-like aluminum member 2 guiding a coil spring elastically supporting a truck frame, and the fitting surface between the first aluminum member 1 and the second one 2 are jointed by friction stir jointing. The fitting section 7 of the first aluminum member 1 is shaped in a flange to a pipe, and in the second aluminum member 2, a fitting hole section 9 allowing the fitting section 7 to be just fitted is formed. Since the fitting section 7 and the fitting hole section 9 are shaped in a staircase with a large diameter on its upper side and a small diameter on its lower side, a load in an axial direction acting on the first aluminum member 1 can be received. Since the position of a stir section 5 is vertically off inside and outside in a radial direction, the influence of the friction stir jointing is displaced in the radial direction, and the jointing strength is improved. COPYRIGHT: (C)2010,JPO&INPIT |
