Coupler buffer device mounting structure with small-fastening-torque pushing under compact space

A coupler buffer device mounting structure, comprising:

• a double-headed stud passing through an installation fabrication hole of a vehicle body structure from a coupler side toward a vehicle body side, wherein the vehicle body side defines a cavity and wherein fastening operations cannot be performed on the vehicle body side;
• a nut screwed on a first end of the double-headed stud;
• a push nut screwed on a second end of the double-headed stud and provided with a plurality of axial screw holes in a circumferential direction;
• and
• a plurality of push screws screwed into the plurality of axial screw holes of the push nut, wherein a coupler buffer device is clamped and fixed to the vehicle body structure by heads of the plurality of push screws abutting against the coupler buffer device via a hard washer, and wherein tightening the plurality of push screws from the coupler side generates a plurality of jacking forces that act directly on the hard washer to clamp and fix the coupler buffer device to the vehicle body structure.