How is it possible to drive big gears at low RPMs?
The invention
My choice was automatic gearbox and flywheels. I’m very interested in automatic gearboxes because I have one car with that kind of gearbox. But why flywheel? Because automatic gearbox isn’t new invention I thought that I will focus on more flywheels because for example VW uses new flywheels (dual mass) in their automatic gearboxes. So I’m interested in about those also and both of relates each other.
How the physics is involved this?
The main physical things are mechanical. Torque and rotation are important measurements of my inventions’ parts. The motions causes warming so heat energy.
My interpretation how those works
I know that there is moving parts (cogwheels) in the gearbox and also the flywheel is in some way like cogwheel. I know that the gearbox works with clutch and flywheel. The gearboxes cogwheels are called planets. They spin differently together in different gears. I know also that engine spins the flywheel and gearbox.
What is good of my interpretatio
I know in some way the functionality of the automatic gearbox and its parts and also at least something about the flywheels.
What is bad of my interpretation
The automatic gearbox is difficult to understand and also I think the flywheel because I don’t even know many people who know the deep functionality. But I will find out the deep secrets. I need more information about clutch, flywheel, dual mass flywheel and of course the automatic gearbox.
Automatic transmission
Gearboxes needs flywheel and clutch to work. The mechanical transmission's clutch and flywheel are like one packet.
In automatic transmission flywheel is between engine and torque converter. There isn't that kind of clutch than the mechanical transmission's clutch. The torque converter is like clutch and some of the automatic gearboxes' have clutches but those are totally different than the basic clutch. They consist of many friction plates.
Flywheels
What is flywheel and why it’s used?
Flywheel is needed because engine doesn’t run smoothly it’s like jerking, for example four cylinder engine’s crankshaft got sharp spin kick in every half turn intervals. The old way to even out that is to use heavy flywheel. Flywheels functionality basis on that the wheel gets kinetic energy which caused by engine. The flywheel’s motion keeps the crankshaft’s rotation smoothly. The heavier the flywheel is, it need more time to achieve big kinetic energy and it takes time to accelerate it but heavier flywheel keeps longer the rotation than lighter wheel. Because lighter flywheel accelerates quickly and easier the engine gets more quickly high RPMs.
When you start your car’s engine, the starter motor (electric motor) spins the flywheel which then spins the crankshaft so the pistons move up and down and then if there isn't any problems in ignition and the fuel-air mix input, the engine starts to run “itself”.
What is dual mass flywheel why it’s used?
Dual mass flywheel is used for example in VW’s DSG automatic gearboxes. It consist of two parts (two flywheels) which are connected together with a spring or springs. That two parts structure’s and the spring’s purpose is to smooth more effectively (than basic flywheel) the torsional vibrations which are caused by the crankshaft. The dual mass is flexible and the basic flywheel isn’t so the dual mass attenuate much better the vibrations.
Because of that dual mass enable the driving with big gears at low RPMs. It’s profitable when we look at the fuel consuming, but because the dual mass is very exposed to vibrations and they aren’t yet so advanced, they can’t stand many years the vibrations.The fixing of dual mass is very expensive.
Almost everyone know when you drive with basic manual car (with basic flywheel) with big gears at low RPMs the car starts to jerk. It’s due to that any parts of the car don’t yield in other words are not flexible like the dual mass flywheel.