Double-sided teaching aid

The utility model discloses a double-sided teaching aid. The double-sided teaching aid is characterized in that the double-sided teaching aid comprises a support plate and a motor; the support plate is vertically arranged; an engine demonstration teaching aid is arranged on one side of the support plate, and a shaper demonstration teaching aid is arranged on the other side; the motor drives a driven small gear to rotate through a drive large gear, so as to drive a crank connecting rod mechanism to convert rotation to the reciprocating linear motion of a piston in the engine demonstration teaching aid; and the motor drives a driven large gear to rotate through a drive gear and the driven small gear, so as to drive a ram in the shaper demonstration teaching aid to carry out reciprocating linear motion. According to the utility model, the crank connecting rod mechanism is applied in an engine on one side of the support plate; the crank connecting rod mechanism is applied in a shaper on the other side; and the double-sided teaching aid relates to many knowledge points, and has the advantages of high applicability, open structure, simple structure, multifunctional mode, simple manufacture, convenient maintenance, small volume, light weight, convenient carrying and low cost.