does anyone here know the exact V angle of a CVT belt......i am building A CVT on my own.......and thinking of testing the system out in my bike........and if it works out.... i will try it out in a KART.....pls help!!!!
Don't you have anything better to do with your time? There's a lot of blacjk magic the design of these things. Anyway most sheaves are 15 degrees and the belts are 17 degrees.
BreezyRacer wrote:Don't you have anything better to do with your time? There's a lot of blacjk magic the design of these things. Anyway most sheaves are 15 degrees and the belts are 17 degrees.
yes u might think so.........but i do have time and i guess i am doin it from scratch.........which i think will need a lot of designing to do........anyway thnks for the reply!!!!!!!!!!!!
The metal belts in push belt CVT's are quite heavy, have low torque capacity, are speed limited due to their high inertias, and have poor efficiency. That is why they're not used in racing and have found only very limited use in production automotive transmissions. All of the push belts in production today are manufactured by, or under license to, Van Doorne (VDT):
i race with small scooters, 2 strokes till 80 cc. The transmission here is done by a cvt system. The systems are quite good developed, and i think not very easy to build by yourself. Picking the system of a big scooter engine will be more interesting i think. The angle of the belt and the poulies is particulary necesaary to make grip between those. I can garantue you having not enough gripp is the worst thing, a bit more grip and a little more resistance in the transmission will be a better thing. I can meassure my poullies tomorrow to give you an idea, though its i think very particular for the ammound of power, or even beter TORQUE what you want to transfer. What do you think is positife for you applications? Most of the profit we get is by having a very narrow powerband, so we only have to find peak horsepower while testing. For long circuit aplication that profit will partly fall away because when the belt is at the end of the poullies you are starting to overrev to a rpm range where is no horsepower anymore. So topspeed will be less i think when you take full advantage of the system. Though you can give your engine a wider powerband, a cvt system has quite a big loss in energie transferring, i think about 20 % ! When you look to scooter engines you will see the cvt first poullie will be directly @ the cranckshaft, the second pully is at an axle where the clutch is to, this axle will fit into a gearing before it drives the rear wheel ( because engines dont have enough torque etc, same as you find on a gearbox engine). Think twice before you try making this work.
