Timing Equipment – Timing gears, because the name implies, are utilized for various timing reasons. Also known as synchronous gears, they may be either spur or helical gears. They are often used in automotive applications to control valve timing in engines.
Worm Gear – A 
worm gear consists of a worm and a worm wheel working collectively. The worm resembles a screw and may also be known as a worm screw, as the worm wheel looks similar to a spur gear or helical equipment with hook helix position. This set may also be also known as a worm drive. Worm gears will be the most compact kind of gear and are often used in applications where space is bound.
Spur Equipment – Spur gears are the most common type of gear. They are used to transmit motion between two parallel shafts and so are known to be highly efficient and generating a lot of power. Spur gears are known by quite a few other names including straight gears, straight-cut gears, spur tires, and spur gearing. All of these have the same fundamental definition and can be used interchangeably.
Pump Gear – A pump gear may be the name for a equipment used in gear pumps. They contain both a driver and driven gear and can become either spur or helical gears. Not to be confused, the word gear pump refers to the whole pump, while pump gears identifies the gears only. Gear pumps are positive displacement pumps, meaning they pump a continuous amount of fluid in each revolution. The volume of liquid in a revolution depends upon the geometry of the pump gears (i.e. Ground Helical Gear Racks number of tooth, diametrical pitch, etc.).
Spline – Splines are the ridges or the teeth (external spline) on a drive shaft that mesh with the same number of like ridges or tooth (internal spline) in a mating piece with the purpose of transferring torque from one member to the other. The most common splines are parallel crucial splines, involute splines (closely related to involute gears but with shorter teeth, root to suggestion), and serrations. Splines could be made by shaping, hobbing or broaching.
Sprocket – Sprockets, or sprocket wheels, are toothed wheels whose the teeth engage the links of chains or belts. Sprockets are distinguished from gears for the reason that sprockets should never be meshed together directly. There are several different types of sprockets, including silent chain, roller, and ladder sprockets.
Pinion Gear – A pinion may be the smaller of two meshed gears in an assembly. Pinions gears can be either spur or helical type gears, and be either the generating or driven gear, based on the application form. Pinion gears are found in many different types of gearing systems such as band and pinion or rack and pinion systems.