technical understanding

name the types of gear

• spur gear

• helical gear

• bevel gear

• worm gears

• rack and pinion gear

• idler gear

• mitre gear

idler gear

a gear which is inserted between two other spur gear .

idler gear are sometimes used to increase the spacing between the input and output shafts without affecting the gear ratio.

spur gear

• have straight cut teeth

• most common

• used for simple motion transfer

adavantage and disadvantage for spur gear

advantage

• simple to design and manufacture

• efficient power transmission

disadvantage

• noisy at high speeds

• only used for parallel shafts

bevel gear

can be used to transfer the direction of the drive shaft in a mechnically system by 90 degrees

advantage and disadvantage of bevel gear

advantage:

• changes direction at 90 degrees

• compact for corner drives

disadvantages:

• complex to align

• teeth wear quickly if misaligned

mitre gear

a pair of identical bevel gear providing a 1:1 gear ratio

helical gear

have their teeth cut at an angle and this allows the teeth to mesh more gradually as the gear rotate

advantage and disadvantage of helical gear

advantage:

• quieter and smoother than spur

• handles more load

disadvantage:

• more friciton and heat

• harder to manufacture

rack and pinion

is a system to change between rotary and linear motion

advantage and disadvantage of rack and pinion

advantage:

• converts rotary to linear motion

• simple and precises

disadvantage:

• limited to straight-line applications

• exposes gear teeth wear easily

worm drives

is a system in which a worm screw enagages with a worm wheel to produce a very high gear ratio in a compact system. the drive direction also transferred through 90 degrees.