Gear is a component in the vehicle body which is under constant load conditions. Sudden accelaration, braking etc put ample of torque and stress on the gear. Gear is subjected to very dynamic stress conditions. Hence, they are generally made of alloys or certain metals. A plastic gear cannot sustain all this.
Also, the gears are manufactured on milling machines where rack and pinion calculations and operations are required. Hence, manufacturing of plastic gears have not been yet developed. There are certain patents and technological developments in plastic manufacturing of gears but are not yet commercialized.
Note: Do not conpare the toy gears with actual gears.
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