![]() ![]() When this fluid undergoes high contact pressures under rolling contact between the two very hard elements, the spheres and the discs, the fluid undergoes a near-instantaneous phase transition to an elastic solid. A traction drive transmission operates utilizing a traction fluid that, under normal circumstances, provides lubrication for the drive. Transmissions that use EHL to transfer power are known as traction drives. The second factor is elastohydrodynamic lubrication (EHL).Contacting a rotating sphere at two different locations relative to the sphere’s rotational axis will provide a “gear ratio”, which can range from underdrive to overdrive depending on the location of the contact points for input and output torque and speed. The first is the geometric configuration of the drive, which is based on differing contact ratio of a sphere.Two factors allow the NuVinci CVT to provide a continuously variable ratio range in a compact package: The result is the ability to sweep the transmission through the entire ratio range smoothly, while in motion, under load, or stopped. This configuration allows input and output to be concentric and compact. The spheres are placed in a circular array around a central idler (sun) and contact separate input and output traction discs. The system has multiple "planets" to transfer torque through multiple fluid patches. The gear ratio is shifted by tilting the axes of the spheres in a continuous fashion, to provide different contact radii, which in turn drive input and output discs. As a result, the NuVinci CVT system offers seamless and continuous transition to any ratio within its range. Tilting the balls changes their contact diameters and varies the speed ratio. The NuVinci CVT gear system uses a set of rotating and tilting balls positioned between the input and output discs of a transmission. Various attempts have been made to implement them in vehicle transmissions, but commercial success has been elusive. Mechanical variators have existed since the 1800s, and they have been used successfully in machinery, particularly the Kopp tilting ball variator. 4 Comparison to conventional transmissions. ![]()
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