Slide 1

Two-Gear Gear Trains Driving gear is attached to motor Driven gear is attached to wheel Gears spurs (teeth) mesh together Gears rotate in opposite directions Using different size gear allows change in speed Gear ratio calculates this change Slide 2 Two-Gear Gear Trains Given the gear on the left is the driving gear: Calculate the gear ratio for these two gears Why might you want to do this? Gear Ratio = 8/24 = 1/3 Gear Ratio = 24/24 = 1 Gear Ratio = 40/8 = 5 Slide 3 Two-Gear Gear Trains A Gear Ratio 1 is called Gearing Up Will the speed of the wheel go up or down compared to the motor? Gearing Up = Speed goes Up But, power (torque) goes down Always some loss to friction Why might you want to do this? Slide 4 Two-Gear Gear Trains Tribot Gearing Need a structural support for the gears What Gear Ratio is shown? Construct this gear pair on a beam How would you use these gears to gear up/down this Tribot? What would the Gear Ratios be? What could you do with these gears?