Helical Gear

Herringbone Gear a special type of double helical gear, there has no relief groove between the double helical gears.

Spur Gear

Internal gear is an annular gear having teeth on the inner surface of its rim, 

Bevel Gear

Spiral bevel gear is bevel gear with curved, 

Gear Shaft

Spiral bevel gear is bevel gear with curved, oblique teeth to provide gradual engagement and larger contact surface and less noise.