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  • Which is better? Manual or automatic transmission?

  • That's a pretty interesting question

  • This debate has been present for the last seven decades

  • Manual and automatic transmissions are completely different technologies

  • Which use different configurations and principles

  • one is based on a simple grear pair while the other is based on a

  • planetary gear set one uses a torque

  • converter while the other uses a clutch

  • pack we will do a logical comparison of

  • these technologies in this video but

  • first let's understand the basic science

  • of transmission an internal combustion

  • engine produces useful torque and power

  • only during a certain speed range

  • due to this inherent problem of IC

  • engines controlling the drive wheel

  • speed by directly connecting them to the

  • engine is not a clever idea such an

  • approach will give the engine of very

  • low efficiency

  • rather we need a transmission in between

  • so that the engines rpm can always be in

  • the maximum efficiency range the

  • transmission takes care of the speed

  • variation of the drive wheels first let

  • us see how the speed variation is

  • achieved in a manual transmission a

  • manual transmission is a collection of

  • gear pairs

  • it has three sections

  • input intermediate shaft and output

  • the input is connected to the

  • intermediate shaft so the intermediate

  • shaft always rotates at a constant speed

  • the intermediate shaft is then connected

  • to the output gear set you can see that

  • the output gears will turn at different

  • speeds due to different gear ratios

  • however the output gears are not fixed

  • with the output shaft and you can even

  • see a gap between the output gears and

  • shaft if we connect only one output gear

  • to the shaft the shaft will have the

  • speed of the connected gear

  • for this the main shafts gears have a

  • synchronizer cone teeth arrangement

  • a hub is connected to the shaft and a

  • sleeve slides over it

  • just by moving this sleeve you will be

  • able to connect the gear and shaft

  • it might seem like a simple mechanism

  • however during an actual operation the

  • hub and gear will be rotating at

  • different speeds and the sleeve gear

  • connection is not possible as they do so

  • first let's make their speed the same

  • for this we must discontinue the power

  • flow to the transmission the use of

  • clutch pack comes here

  • by disengaging the clutch pack the power flow to the gear

  • set is discontinued

  • now a synchronizer ring with a friction

  • cone can help to match the speed of gear

  • with the sleeve

  • when there is no power flow pushing the

  • synchronizer ring against the gear will

  • help match the speed of the gear to the

  • hub

  • now we can have a smooth connection

  • after the connection clutch pack is

  • engaged

  • so every time you need to change the

  • gear you must disengage the clutch this

  • also means power discontinuation and an

  • Associated speed drop during the gear

  • change this is why a manual transmission

  • drive is never a smooth experience now

  • let's see how an automatic transmission

  • is different from manual transmission

  • automatic transmission was developed to

  • overcome the power discontinuation

  • problem in manual transmission and it

  • uses a planetary gearset arrangement

  • rather than a simple gear pair

  • you can see that a planetary gearset has

  • two inputs and one output

  • the basic principle of automatic

  • transmission is simple just vary these

  • two input speeds and you will get

  • different output speeds

  • to achieve this objective let's

  • introduce one more planetary set

  • the output of the second

  • connected with one of the inputs of the

  • first set in simple words the carrier of

  • the second set and the ring gear of the

  • first set are a single unit this forms

  • an interesting mechanism and is the

  • simplest automatic transmission possible

  • to clutch packs are introduced to arrest

  • the motion of the ring grears

  • when the clutch pack is pressed the

  • corresponding ring gear will be

  • stationary and carrier will rotate

  • when the first clutch is pressed the

  • green ring gear is stationary and we

  • will get the first gear

  • if we can turn the green ring gear the

  • output speed will increase to achieve

  • this you must release the first clutch

  • and engage the second clutch the green

  • ring gear will rotate as it is connected

  • to the carrier of the second set

  • it is worth noting that the first clutch

  • is being released at the same time that

  • the second clutch is engaged so there is

  • no loss in power transmission

  • for different output speeds are possible

  • with two planetary set arrangement to

  • learn the details of it check out our

  • detailed video on automatic transmission

  • by using three planetary gear sets in

  • series we will be able to achieve six

  • different speeds and a reverse the

  • beauty of the automatic transmission is

  • that by engaging the proper two clutch

  • packs we can achieve different output

  • speeds

  • now let's compare these two technologies

  • directly as discussed in the automatic

  • transmission there is no abruption of

  • power flow so you will get a smooth

  • driving experience computer controlled

  • operation of the automatic transmission

  • makes the driving even simpler it is

  • clear that the manual transmission

  • technology is much simpler than the

  • automatic it has fewer components and is

  • easier to repair on the other hand

  • automatic transmission is a tightly

  • packed arrangement when it comes to

  • heavy duty operations manual

  • transmissions offer more durability due

  • to this reason almost eighty percent of

  • heavy duty trucks use manual

  • transmissions

  • the way automatic and manual

  • transmission handles the condition of

  • braking is quite different and

  • interesting

  • in manual transmission driving before

  • you press the brake pedal the clutch

  • pedal must be pressed completely this

  • way the engine rotation and wheel

  • rotation are separated completely and

  • the sudden cease of the wheel will not

  • be transmitted to the engine

  • however there is no clutch pedal in an

  • automatic transmission car so to

  • separate the engine rotation from the

  • transmission a torque converter is used

  • this is a fluid coupling which allows

  • slippage so a torque converter helps

  • automatic transmission handle the

  • braking scenario without the need of a

  • clutch pedal however a torque converter

  • is a good heat generator which in turn

  • reduces efficiency of the vehicle as a

  • result automatic transmission vehicles

  • tend to become less fuel-efficient than

  • manual vehicles however the modern

  • torque converters have overcome this

  • problem it is our hope that the next

  • time you plan to purchase a four-wheeler

  • you will be able to choose the proper

  • transmission technology according to

  • your needs to miss our video on DSG

  • transmission which has the best features

  • of automatic and manual transmissions

  • combined please consider helping us at

  • patreon.com so that we can sustain our

  • educational services thank you

Which is better? Manual or automatic transmission?

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Automatic vs Manual Transmission

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    OolongCha に公開 2021 年 02 月 24 日
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