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A short description of the main characteristics of the CVT Warko.
Modularity , wide ratio range (= 9 ! ) and absence
of clutch are the most important characteristics of
Warko, the new CVT (Continuously Variable Transmission)
shown in preview presentation during the 6th International
CTI Symposium of Innovative Automotive Transmission, in
Berlin, 3-7 December 2007.
Adding high efficiency (95%), high torque capability (120
to 500Nm), and compactness ( length: less than 36 cm;
diameter: 31 cm; weight: max 60 kg), Warko has the right
numbers to become, in the near future, a MUST in Automotive.
 Clik here to download the pdf document
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Last Updated ( Friday, 07 March 2008 )
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Warko: Technical characteristics Without clutch |
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Here follows the study of a particular characteristic of Warko,
which allows to avoid the use of the clutch.
As we have already seen in another article, the clutch allows to gradually
connect the motion of two shafts that rotate at different speeds, in order, for
instance, to move a car with internal-combustion engine, without switching off
the engine, and employing the traction not instantaneously through a gear, but
progressively. |
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Last Updated ( Thursday, 24 January 2008 )
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Warko: Technical characteristics Traditional clutch |
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Considering a traditional motion transmission chain in the automobile field, one of the main components, apart from the ratio variation, is the clutch macro-component .
The clutch is a mechanical gear that connects two shafts in order to allow or to avoid the transmission of the rotatory motion.
In other words, the clutch allows to gradually connect the motion of two shafts that rotate at different speeds, in order to move, for instance, an internal combustion engine car without switching off the engine, nor employing the traction instantaneously by means of a gear, but progressively.
The clutch inserted in the transmission between the engine and the gearbox, allows the temporary break of the output torque caused by the engine, in order to allow the speed variation, and it disconnects the wheels from the engine when the car is staedy, keeping the unit switched on.
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Last Updated ( Saturday, 29 December 2007 )
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Warko: Technical characteristics Weight and overall dimentions |
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There are some other important factors regarding the practical application of a CVT: its weight and its overall dimensions.
If we examine the Warko CVT , both of these parameters are particularly interesting.
Weight
As regards the Warko CVT in its 8 cones configuration (maximum torque), its weight is about 60 Kg excluding the electronic station and the mechanisms for the actuators and the lubrication.
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Last Updated ( Friday, 28 December 2007 )
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Warko: Technical characteristics Efficiency |
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If we examine the Warko CVT from the functioning point of view, one of the parameters that better describe its working and its application is efficiency.
The total mechanical efficiency of the Warko CVT (included the actuation and lubrication mechanisms) ranges from 84% (least) to 94% (most).
Efficiency changes in relation to the variation of the transmission ratio; it depends on the coupling geometry and on the working pressure in the coupling cone/bell.
It is important to specify that the above results are achieved by means of a basic traction fluid (Findett' Santotrac 50). We will soon test different more efficient fluids that we exspect will increase the CVT's performance. |
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Last Updated ( Saturday, 29 December 2007 )
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Warko 