Gear Ratios and Gearing

Driver-A

Follower-B

Follower-C

Driver-A

Idler-B

Name the type of gear

Spur Gears

Name the type of gear

Differential

Name the type of gear

Bevel Gears

Name the type of gear

Rack & Pinion

Name the type of gear

Worm gear

Spur Gears Teeth

Worm Gears Function

Worm gears allow axles at right angles to transfer rotational motion

Bevel Gears Function

Bevel gears allow rotational motion to be transferred at right angles

Rack & Pinion Gear Function

Racks and Pinions are used to translate rotational motion into linear motion

Differential Gear Function

Differentials are devices that allow each of the axles to rotate at different speeds, while supplying equal torque to each of them

Sprockets & Chains

Sprockets inside the same chain rotate in the same direction.

Sprockets outside the chain rotate in the opposite direction.

Pulleys & Belts (Pulleys and belts are not available for VEX)

Sometimes tank treads can be used as belts

Gear Direction

Even Number of Gears:

Odd number of Gears:

Even number of gears: Driver & follower turn in opposite directions.

Odd number of gears: Drive & follower turn in same direction

Geared Up 3 Functions

\-Large driver turns small follower

\-Increases speed

\-Decreases torque (turning force)

Geared Down 3 Functions

\-Small driver turns large follower

\-Increases torque (turning force)

\-Decreases Speed

Gear Ratios(determining what a gear will do)- What is the gear ratio

What is the gear ratio?

Long Gear Trains

\-The gear attached to the motor is the driver

\-The gear doing the work is the follower

\-All in-between gears are idlers

Compound Gears (Multiple Gears on One Axle)

\-Pair up drivers and followers

\-Start a new driver/follower pair if an axle has a second gear attached

\-Multiply the gear ratios of all the driver/follower pairs.