AS Gearing fundamentals

Brake pliers

To remove and install retracting springs

When lifting the drum, do not place hands behind the drum

This is a very serious safety hazard

Gears

Toothed wheel, cylinders or other machine elements

Purpose of gears

Transmits motion between shafts

Change the direction of motion

Increase or decrease speed

Increase or decrease torque

Provide a positive, non slip drive

Mesh

The engagement or disengagement of teeth of rotating gears.

Meshing gears

Must be identical but the number of teeth is irrelevant

Driving gear

The gear in which torque is applied

Driven gear

Reacts to the driving gear

Pinion gear

Smallest gear of the set

Will always mesh with a larger gear

May be driving or driven gear

Will always be externally toothed

Idler gear

Gear changes the direction of the motion and has no effect on ratio

Ring gear

Is the large gear within the set

What type of ratio is 6:1

Positive

The effect of speed and torque for a 6:1 ratio

Torque-increases

Speed-decreases

What type of ratio is 1:6

Negative

The effect of torque and speed for a 1:6 ratio

Torque-decreases

Speed-increases

If pinion gear is the drive gear what type of ratio is it

Negative

Classes of gears

Spur, bevel, and worm

Spur

Class of gears transmit motion between parallel shafts

Helical gears require

The use of a thrust bearing due to the tendency of travel

Bevel

Used to transmit motion between no parallel shafts

Hypoid

Type of gear is used for off Center meshing

Worm class of gear is used when

Maximum torque increase is desired