Car wheel rim decoration cover fastening structure

A wheel rim assembly comprising:

• a wheel rim, a decoration cover, and a locking cap;
• wherein:
• the wheel rim has a rim body;
• the rim body has a center provided with a first central hole penetrating the rim body;
• the first central hole has an inside formed with a first flange protruding therefrom;
• the decoration cover has a cover body;
• the cover body has a center provided with a second central hole penetrating the cover body;
• the second central hole has an inside formed with a second flange protruding therefrom;
• the cover body is assembled on the rim body;
• the second central hole aligns with the first central hole;
• the locking cap includes a cap body and an elastic ring;
• the cap body has a face formed with multiple insertion shafts protruding therefrom;
• the insertion shafts are arranged annularly;
• a predetermined distance is defined between each of the insertion shafts and an edge of the cap body;
• each of the insertion shafts has an outer face formed with a locking hook;
• each of the insertion shafts has an inner face provided with at least one annular positioning groove;
• the elastic ring is mounted in the at least one positioning groove of each of the insertion shafts simultaneously;
• each of the insertion shafts passes through the second central hole and the first central hole simultaneously;
• the locking hook of each of the insertion shafts is locked on the first flange simultaneously;
• and
• the cap body rests on the second flange.