Transmission system
The original PlusGo is equipped with a reduction gear box, and the gear ratio (reduction ratio) is approximately about 90:24; however, the output torque is still not big enough to propel this heavy giant to move up a steep slope. Besides, if we singly use a worm gear device, the car cannot accelerate under certain condition like jumping over a gap or racing with other cars. As a result, we decided to design a transmission system including a worm gear box and a spur gear box. The redesigned system is shown below. This picture was done with SolidWorks2013. |
The Acceleration and Deceleration Mode
In the Left picture, input torque is applied to the worm gear and transmits to the spur gear as well as the bevel gear. After a series of reduction process, the torque is transmitted to the big spur gear and output shaft. The purpose of introducing a pair of helical gears is to ensure the output shaft direction is the same as the input shaft’s no matter it is under a deceleration or acceleration mode. |
In the Right picture, The blue arrow denotes a servo motor used to move the DC motor under different transmission mode. The red arrow is used to denote the power transmission direction; the torque is transmitted directly from the input shaft to the output shaft with only a spur gear reduction ratio (90:24). Therefore, it produces faster speed for the car under this small reduction ratio.
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