Originally Posted by mof4000
I just have one simple and i mean simple question about a direct drive without using a clutch/flywheel etc.. What exactly are you keeping on the transmittion and how does it shift without the clutch etc...? please help.. thanks!
It depends on what you mean by direct drive.
By the way you worded your question, I think you might be referring to hooking the motor "directly" to the gearbox without a clutch. In this situation an adapter is normally made from an old clutch plate that hooks the motor shaft solidly to the gearbox input shaft with no way to dis-engage it. You remove the WHOLE clutch assembly. None of it is used. Not the flywheel , the peddle, nothing!! When you want to change gear it is made possible by the fact that an electric motor has virtually no mass(compared to an ICE motor). This allows the syncro's in the gearbox to match the internal gear speeds reasonably quickly which allows the gear to be selected. To change gear you just take your foot off the gas and slip the leaver into neutral. You then GENTLY & SLOWLY introduce the gear leaver to the gear you want to select. The syncro's will match the gear speeds and you will "FEEL" the gears mesh and the leaver will sort of "fall" into place. Then you put your foot back on the gas
This may sound complicated but it can be done easily with practice and it only takes only a few second longer than changing with a clutch. The important thing is to remember NOT TO RUSH IT!!
You can actually do it with SOME
normal ICE cars, but it takes a lot more concentration to use the gass peddle to balance the motor speed to the gearbox speed. It's harder because the the ICE motor has far too much mass for the syncro's to overcome and they can't match the speeds. The clutch helps out here by removing the motor mass from the equation so the syncro's can do their job with only the mass of the clutch plate to deal with.
An electric motor has more mass than a clutch plate thats why you can't shift as fast when you go clutchless in an EV.
Normally, "direct drive" means that the motor is attached directly to the tail shaft of a rear wheel drive car with no gear box at all. You need a large motor for this that is capable of supplying the torque necessary to drive you up hills and your speed is limited by the ratio in your differential and you motor redline. Reverse is attaned by reversing the direction of the motor through the controller.
Hope this helps