Timing Gear – Timing gears, since the name implies, are used for various timing reasons. Also known as synchronous gears, they may be either spur or helical gears. They are generally used in automotive applications to control valve timing in engines.
Worm Gear – A worm gear contains a worm and a worm wheel working together. The worm resembles a screw and may also be called a worm screw, as the worm wheel appears comparable to a spur equipment or helical equipment with a slight 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 found in applications where space is limited.
Spur Equipment – Spur gears are the most common kind of gear. They are accustomed to transmit motion between two parallel shafts and so are known to be highly efficient and creating a lot of power. Spur gears are known by several other names including straight gears, straight-cut gears, spur wheels, and spur gearing. All of these have the same simple definition and can be used interchangeably.
Pump Equipment – A pump gear may be the name meant for a equipment used in equipment pumps. They contain both a driver and powered gear and can end up being either spur or helical gears. Not to be confused, the term gear pump refers to the entire pump, while pump gears identifies the gears just. Gear pumps are positive displacement pumps, meaning they pump a constant amount of fluid in each revolution. The quantity of liquid in a revolution depends on the geometry of the pump gears (i.e. number of teeth, diametrical pitch, etc.).
Spline – Splines are the Ground Helical Gear Racks ridges or tooth (exterior spline) on a drive shaft that mesh with an equal number of like ridges or the teeth (internal spline) in a mating piece with the goal of transferring torque in one member to the other. The most typical splines are parallel crucial splines, involute splines (carefully related to involute gears but with shorter the 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 in 
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 is the smaller of two meshed gears within an assembly. Pinions gears can be either spur or helical type gears, and become either the generating or driven gear, depending on the application form. Pinion gears are used in many different types of gearing systems such as band and pinion or rack and pinion systems.