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Jul 15, 2018

what is the RUBURBAN effect in CVT

6 comments

 

Jul 15, 2018

CVTs have rubber band effect.

 

From Quora -

 

The CVT is a great concept, and has always worked very well on smaller engines. As the engines reached a certain torque, there was a tendency for the metal belts to slip. This, of course, not only gives you that sensation, but wears the steel belt and pulleys. The CVT system works by varying the diameter of the input and output pulleys (like a bicycle without cogs on the chains and continuously changing diameters instead of a few fixed ones). The CVT transmission, like all others, need oil to cool and lubricate their moving parts, but that oil also lubricates the belt/pulley assembly. CVT oils are formulated with traction additives that change the dynamic friction coefficient. The first generation of CVT oils were fine with small engines, but slipped with the medium ones. Second generation was able to take care of bigger engines, and the third generation is now quite capable of handling the 3.5-litre engines. I recently put third generation oil in my 2009 Outlander (designed with first generation oils) and the driving difference is substantial. There are different nomenclatures for these oils: In Nissan it was NS-1, NS-2, NS-3 (third generation) . In Mitsubishi the third generation is called J4. The fixed shift points someone referred to are not the fix for this. They are the way they allow people to feel shifts and play as if they had a manual transmission, or giving you downshift points. But jumping to these points also stresses the belt/pulley tension. The problem was exasperated by the original idea that the oil did not require changing. Experience has taught me that 30,000 to 40,000 miles is the most you should drive without changing this oil if you do any mountain or city driving. Highway cruises are not that hard on the oil. Stretching the oil changes beyond this causes varnish formation and slippage.

 

Jul 18, 2018

All CVTs are more or less the same as the mechanism on which they work are identical.

Jul 18, 2018

is it shift gears quickly than normal automatic

and which gear box is the best in automatic

 

Jul 19, 2018

Best gearbox in automatic is dual clutch.

Jul 21, 2018Edited: Jul 21, 2018

Is the lack of shifting gears by using paddle shifters in a CVT is due to the ruber band effect???

 

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