BELT DRIVES AND GEAR TRAINS

A belt drive is a system of pulleys connected by belts. Each belt connects a apir of pulleys, so they turn together.

To calculate the ratio of transmission between the first Wheel and the last Wheel of a belt drive, we must multiply the ratios of transmission of the first pair or wheels and the second pair of wheels:

(N4/N1=(D1*D3/D2*D4))

N is the speed of rotation and D is the diameter of Wheel.

We can also find the radius ® or the circumference os each Wheel and use those measurements to calculate tje ratio of transmission. For gear trains, we make these calculations using the number  of cogs or teeth (Z)

CHANGES IN DIRECTION AND ROTATION

We can use various systems to change the direction of rotation of the axis of rotation in a belt drive. We can also vary the distance between the wheels.

With the belts, we can change the direction of rotation and the axis of rotation quite easily. However, gear drives require special parts to make these changes. We use different types of gears when two axes are parallel, perpendicular or crossed.

 In some gear mechanisms, several cogs or teeth interlock at the same time. These mechanisms are more precise and they transmit more rotary force, or torque.