Gears are an integral component of most mechanical devices that
are in use today. Gears have wide ranging functions, but they
are used for transmitting motion between two shafts. Moreover,
they provide torque to a device that a fast spinning small motor
cannot provide. Another important feature of gears is that they
give direction to the process of rotation. This article provides
information about just these types of gears, specifically
reverse gears.

A pair of gears, one present on the counter shaft and the other
on the output shaft are used to implement the process of
'reverse'. As opposed to forward gears that are meshed together,
there is some amount of space between the reverse gears. Another
point of differentiation from forward gears is that reverse
gears are joined to their shafts. There is no free rotation
around the shaft. There might develop a scenario when a small
gear that is known as the reverse idler is slid between the two
gears. The function of this gear also called the idler gear is
to mesh the two gears together. This enables it to change the
direction of the rotation, but it does not hamper the gear
ration in any way.

The method of working of reverse gears is not as complex as it
seems. When the reverse gear is selected, the gear teeth of
these gears are meshed. There is absolutely no aid from the
mechanism that seeks to synchronize these gears. This is one of
the primary reasons why the output shaft must now move, once a
reverse is selected. That mean a car must be stopped when you
want to select the reverse gear. Many automobiles have a
mechanism wherein the input shaft also stops spinning when
reverse gears are selected. This decreases the grinding that
accompanies the selection of reverse when there is an inertial
spinning of the input shaft.

Car companies do not necessarily uses the same reverse
technologies across all makes. Advanced technologies make
possible the use of sophisticated reverse gears in modern cars.
Of course, these cars come with a hefty price tag. But, more
often than not a mechanism is used which stop the transmission
of the input shaft. If this is not done the vehicle produces a
whining sound. This is why all car manufacturers use the idler
that, as aforementioned, can be inserted between the two gears.
This procedure reduces the accompanying noise to a great extent
and in the service manual of many companies; you can find a
mention of this system as a "noise reduction system".

A new kind of reverse technology has entered the market in the
recent times, called 'spur reverse technology'. This technology
has made a few improvements to the one that have been listed
above. But, it has compromised on a few aspects like,
robustness, engagements, and noise. But it has found
acceptability because there is limited driving that takes place
in reverse.

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