Lower Gears : Emit More Sound

In several machines like cars and automobiles gear ratio has to be altered for suiting a particular task. You will find different methods for achieving it. These could be manual transmission, automatic transmission, hub gears or derailleur gears. Hub gears are also known as sun and planet gears or epicyclic gearing.

Gear shifting provides many outcomes in automobiles. It has a good impact on the noise emissions in vehicles. If lower gears are used in the vehicle then the levels of sound emitted would be higher. The low ratio gears have shorter design life so cheap gears could be used like spur for reverse and first.

Due to it more noise is generated as overlap ratio is smaller and mesh stiffness is also lower. High ratios make use of helical gears and possess better properties. This concept has been used for observing the sound generated by vehicles since a long time and has led to the designing of noise barriers used in urban areas.

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