Gear Systems

Question 1

What are gears ?

Answer 1

Wheels with teeth around the outside
Simplest form is a spur gear

If several wheels are interlocked they can transfer motion from one place to another

Question 2

What are gear trains ?

Answer 2

When two or more gears are joined together

The drive gear ( small gear) causes the driven gear ( large gear) to turn in the opposite direction

Question 3

How do you work out the gear ratio ?

Answer 3

Driven gear number of teeth ( larger gear)
Over
Drive gear number of teeth ( small gear)

Question 4

How would you work out the gear ratio for a drive gear of 50 and a driven gear of 25?

Answer 4

25 divided by 50

0.5

1:2

Question 5

If the drive gear and the driven gear are separated by another gear called…. They will move in the … direction ?

Answer 5

Idler

Same direction

Question 6

What is a rack and pinion ?

Answer 6

A gear system that changes rotary to linear motion

The pinion is fixed onto the shaft and when it rotates the rack moves

Question 7

What is a good example of rack and pinion ?

Answer 7

Electrical sliding garden gates