![]() ![]() ![]() So what is the purpose for the model to use the compound gear? Using compound gear could change the output rotation speed, but one more important reason here is the distance mismatch. One example of compound gear is shown in the below diagram. The 24-tooth spur gear connects the output shaft to drive the wheels finally. The 8-tooth grey gear then meshes with a 24-tooth spur gear to further transfer the rotation power downward. The 12-tooth black gear spins and brings the 8-tooth grey gear to spin at a same speed. The 12-tooth black gear and the 8-tooth grey gear are fixed on the same shaft to form compound gears. Please pay attention to the compound gear structure here. It meshes with a 12-tooth black gear, which then transmits the rotation power alone the compound gear train. One 20-tooth black gear is just the one I mentioned in the above bevel gear structure. Two black gears are meshed together, which I indicate with red arrows. The below diagram shows the model in the bottom view. Compound Gears to Transmit Power to Wheels ![]()
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