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How to change Gears? The Manual Transmission explained (PART 2)

How to change Gears? The Manual Transmission explained (PART 2)

do you ever wonder why we need to change
gears while we’re driving and what is the reason why we hear that horrible
grinding noise while we’re shifting gears in this video we will explain why
cars need transmissions and to do that we will see the working principle of the
clutch and manual transmission in the first part of this video we had the
chance to understand the entire car ignition system now we will see what we
need to do in order to drive our vehicle suppose that the drive stick is put in
neutral which is the stage where no gear is engaged before we change the gear
ratio we have to press the clutch pedal on the left all the way down the purpose
of this pedal is to control the speed of our vehicle by partially engaging the
clutch plate which is a mechanical device made of one or more friction
discs pressed tightly together this plate allows the flywheel and the
crankshaft to be gradually combined or disengaged with the gearbox when the
clutch pedal is pressed in fact the clutch diaphragm spring pulls the
pressure plate away from the flywheel thus disengaging the clutch from the
engine now with the clutch pedal pressed we
have to put the drive stick in this position as we can see in this animation
the shift sleeve is sliding from the hub (which is fixed to the shaft) to the
synchronizer cone of the first gear now that the first gear is selected we have
to release the clutch while slowly pressing down on the gas pedal in order
to reconnect the engine to the gearbox and thus to move the vehicle forward the
clutch pedal plays a fundamental role in shifting gears if we try to change gears
without using it the gear teeth can misalign with those of the shift sleeve and the car will produce that grinding noise but we will talk about this in a moment
let’s focus now on the manual transmission operation in internal
combustion engines the rpm bandwidth in which the engine produces its peak
torque is limited for this reason transmissions allow us to control the
speed and torque available to the drive wheels by selecting different shift
ratios for different driving conditions whether the car speeds up or slows down lower gears have higher torque in order
to achieve better acceleration but at the same time they have lower
transmission speed which is useful to start to drive from a standstill or
climb a hill on the other hand higher gears will have higher transmission
speeds and lower torque which results in a decrease of acceleration useful to
travel along a straight section of the road at a constant speed in order to
change gears when the engine is running the main shaft gears are equipped with a
synchronizer cone teeth arrangement a synchronizer ring helps to match the
speed of the gears with that of the shaft the synchronizer ring is capable
of rotating along with the hub but it is also free to slide axially as we
already said if we try to change gears without using the clutch the gear teeth
can miss align with those of the shift sleeve and suddenly we hear the grinding
noise without the clutch in fact the flywheel is still connected to the
transmission and it supplies a strong external force to it in this situation
the synchronizers don’t have enough time to match speed of the gears with the one
of the shaft furthermore when we perform clutchless shifting we are creating a
large amount of unneeded we’re on our synchronizers with that in mind we can
now shift into second gear third gear fourth gear and fifth gear the reverse gear instead
has a different configuration more than 10 years in industrial supplies have led
JAES to become a qualified partner for some of the most important automobile
manufacturing companies providing its technical support over a wide range of
industrial components necessary during the production process of many types of
vehicles here we can notice that the reverse gear uses a three gear
arrangement out of those one is the idle gear when the idle gear is pushed and
connected to the other two gears the output shaft will turn in the reverse
direction it is important to note that there is no synchronizer in the reverse
gear so we can only engage Reverse from a standstill the rotary motion of the
output shaft is now transmitted via differential to the wheels in the next
video we will explain how to drive on curves and how the steering system works if you found this video useful please
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