![]() Herringbone gears have the two helical gears joined side to side. However, they are smaller and have no space between the two helical faces. This set of quite similar to the double helical gear. Using a double helical gear ensures more significant tooth overlap, which results in smoother transmission. ![]() The faces are identical but have opposite helical angles. In double helical gears, there are two helical faces next to each other with a space between them. However, the double helix gears have teeth in both directions. Single helical gears have teeth in either the left-hand helix or right-hand helix. In addition, they experience less wear and tear conditions since there is less friction. Different helical gear types will be shown below. Also, they work with less noise and vibrations as loads are better distributed. As a result, helical mechanical gears can carry larger loads. They have multiple teeth in contact during transmission. Helical gears have their teeth positioned at an angle to the shaft in contrast to spur gears which are parallel. They are the commonest forms of gears that have applications in automotive, conveyor systems, gear pumps and motors, speed reducers, etc. Therefore, when it meshes with another spur gear, it transmits the power in a parallel shaft. The teeth of spur gears are parallel to the shaft axis. Spurs gears transmit power in the same plane when the two shafts (the driving and the driven) are parallel. Below are the most important kinds of gears. ![]() In mechanics, grouping gears into various classes depends on teeth configuration, use and direction of motion.
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