World's first GEARED CVT is a game changer!

A company in Italy has engineered the world's first GEARED CVT transmission. If this passes the final stage of development and makes its way into vehicles, it could be a complete game changer! No more rubber band feel from belt driven CVT's

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#automotivenews #cvt #transmission

[dannybryant]

I really like the planetary gearset CVTs that many modern hybrids use to allow the gasoline assist engine to assist the electric drive.

Toyota and Ford come to mind. Hybrids like the Prius and Camry are electric cars with gasoline engine assist (especially below 45 mph).

When the electric drive needs help the gasoline engine provides assistance up through the planetary gearset.

Nice smooth torque to help the main traction motor.
A smaller motor running the sun gear sets the rpm of the gasoline engine.

YouTube has videos on how this works.

Above 45 mph the two electric motors manipulate the planetary gearset to make the gasoline engine do all the work (at the most efficient rpm)

[strmercl]

I emailed the guys at ratio zero to ask them about this cvt, and they responded:
My email to them:
I am very curious, and love your cvt and if I can find a car with it in when I am older, I will buy it. But I have a few questions. 1) In a car, how much faster could you accelerate with your cvt compared to a traditional gear system since it is not exactly torque limited (unlike other cvts). 2) Some high performance cars use clutches before the wheels to vector the movement of the car, would your CVT be better for this purpose, since it has a 'ratio zero' 3) Can this CVT be improved, made bigger ect to handle a the requited amount of torque for an application, or is there a mathematical limit? 4) Will this CVT be used in wind turbines? 5) How fast theoretically could your design of CVT switch between preset gear ratios? 6) Is it possible for there to be a cvt design which has both reverse and forward gears on it?

Their response:
we are positive that we will have a competitive edge over many transmission technologies (high torque + stepless, continuous shifting), but to give any figure we will have to perform measurements, and to perform measurements we need to finalize some automotive application, which will depend on discussions with customers.

As for 2), we feel that torque vectoring is achieved with more effective means that a CVT. For 3-4), no problems to scale up to a wind turbine size, for instance (depending on customer requests). For 5), it basically depends on the power of the motor actuating the shift. For 6), yes but with additional elements that we did not included in the e-bike design.

I was happy to recieve a reply from them, and their answers made sense, and hopefully we'll get more concrete figures when they have completed all of their testing...

[andresd]

I drive electric now, but recently I needed to buy a gas car overseas where EV's are not practical yet, after driving two cars with CVT, a Nissan and a Subaru I had enough of that POS, and decided to get a Mazda with a regular transmission. I will never ever buy a car with a CVT.

[limitedmark]

Obsolete already, that is not the answer. That is an expensive white elephant . Koenigsegg has already put this into the "redundant" bucket.