Linkage mechanism for double-wheel combination of vehicle

A linkage mechanism for double-wheel combination of vehicle comprising:

• a linking block for receiving a center axle;
• the center axle arranged to the linking block;
• a sway block being pivoted to the center axle;
• a connecting rod pivoted to the sway block of the center axle;
• a main frame;
• wherein the main frame is assembled by a front frame and a rear frame;
• the center axle is axially retained by through holes formed to the front frame and the rear frame respectively;
• the two sway rods are pivoted to at least one of the front frame and the rear frame;
• and
• two sway rods pivoted to two ends of the main frame;
• the sway rods being pivoted to two ends of the connecting rod respectively;
• and
• wherein the two sway rods will sway simultaneously and identically through the linking of the connecting rod;
• and
• wherein the sway rod is covered by a side shield;
• and
• wherein the sway rod includes a rod body having an upper section and lower section;
• the outer diameters of the upper section and lower section are smaller than that of the rod body;
• the side shield is approximately a cap body covering the sway rod;
• the side shield has two through holes on the top and the bottom thereof for receiving the upper section and the lower section of the sway rod respectively.