Abstract: An improvement of the pulley set structure connects the clutch assembly by a belt for the convey of the power, comprising a variator and a fan impeller. One side of the fan impeller is designed to form a setup of indentations and protrusions, which is to boost the transmission coefficient between the fan impeller and the belt; the variator is provided with a plurality of grooves allocated with rollers or weights, a skirt portion made of a rigid wall which is located near the rim of the variator, and a plurality of vents formed onto the grooves and the skirt portion, where the purpose is to improve the dissipation of the excessive heat generated by the rolling of the rollers or weights which in turn are activated by the engine, or to improve the skid and incomplete transmission subject to inefficient friction between the pulley set and the belt.

Abstract: An improvement of the clutch housing structure, comprising a housing that fits the clutch carrier of the clutch disk, where the housing is provided with a skirt portion that embraces the clutch carrier; and a washer in rigid wall, which is fixed onto the inner side of the skirt portion of the housing, where the washer and the clutch carrier press each other to form a obstruction that characterizes high coefficient of friction, which further drives the boss to move the wheels; the target is to improve the imperfections of the prior art which includes the deformation at high temperature, or the skid and incomplete transmission by lacking of enough friction.