Patent ID: 8469644

Claim:
A stem fastening structure, comprising: a cap, having a pillar corresponding to a top edge of a middle hole of a front fork, a ring shoulder abutting against a top end of a stem, and a head hole passing through the cap; a bolt, having a bolt head corresponding to the head hole so as to be located therein, and a bolt rod penetrating into the middle hole of the front fork; a packing member, received in the middle hole of the front fork, the packing member having a loop portion, the loop portion being formed with a through threaded hole for receiving the bolt rod therein, two wing portions horizontally extending outward from two peripheral sides of the loop portion, two bottom cone portions extending upward from distal ends of the wing portions, an interval between the two bottom cone portions being gradually enlarged from the loop portion, a top end of each bottom cone portion extending upward to form a positioning portion, an interval between the two positioning portions being constant, a top end of each positioning portion extending upward to form a top cone portion, an interval between the two top cone portions being gradually contracted from the two positioning portions, a top end of the two top cone portions defining an opening for the bolt rod passing therethrough, the top end of the two top cone portions abutting against a bottom of the cap.