What is the difference between helical gear and screw?

Answer 1

Spur gears have straight teeth while helical gears have curved teeth. Generally, helical gears are usually quieter and smoother in operation, while spur gears are easier to make and much less expensive.
Helical gears are stronger than spur gears.

Answer 2

spur gears have straight teeths.

whereas helical gears have tooths crossed at an angle.

spur gears are very noisy and helical gears have greater load capacity than the spur gear of same size. This is because in spur gears take the entire load in the tooth whereas the helical gears distributes the same load on to the shaft hence the gear tooth itself takes less load than a spur gear of same size

Answer 3

Helical gear and screw pump are often interchangeable designations for a rotary positive displacement pump that moves fluids. In a single screw helical gear pump the gear looks like a screw and fits tightly into the casing in order to move the fluid axially along the screw. In a multiple screw helical gear pump two or more "gears" or screws intermesh with one another to pump a fluid axially or radially through the pump.

Answer 4

because the car moves fowards and backward

Answer 5

Helical gears are used because they run more smoothly and quietly than straight-cut gears.

Answer 6

Helical gears are stronger than spur gears.

Answer 7

A helical gear is stronger.

Answer 8

Because they are stronger than spur gears