Gear Classification

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Gear Classification

Helical gears

The teeth of a helical gear are set at an angle (relative to axis of the gear) and take the shape of a helix.

Rolling mills

Port and power industries

Printing

The teeth causes sliding contact, which produces axial forces and heat, decreasing efficiency. And are more expensive.

They have less noise, especially at medium to high-speeds, less load on each individual tooth, a smoother transition of forces from one tooth to the next, so that vibrations, shock loads, and wear are reduced.

Spur gears

Are a type of cylindrical gear, with shafts that are parallel and coplanar, and teeth that are straight and oriented parallel to the shafts

Home appliances

Crushing equipment

Ball mills

The method of tooth meshing causes high stress on the gear teeth and high noise production, so they're typically used for lower speed applications

They are easy to manufacture and suitable for a wide range of applications and generally have high transmission efficiency

Special Gears

Hypoid gears

A hypoid is a type of spiral bevel gear whose axis does not intersect with the axis of the meshing gear

Bevel gears

Angle between the shafts (intersecting apices)

Rack and pinion

Diameter of the wheel infinite

Worm and worm gear

Worm has only one tooth matched with the worm gear

Herringbone gears:

Joining of two identical helical gears with opposite hand on the same shaft

Applications

Power Transmissions

Steam turbine

Disadvantages

Are more difficult to manufacture than equivalent spur or helical gears and more expensive and it cannot be cut by simple gear hobbing machines

Advantages

They have the advantage of transferring power smoothly and the side-thrust of one half is balanced by that of the other half