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Transmissions and Transmission Fluids
Published in Leslie R. Rudnick, Synthetics, Mineral Oils, and Bio-Based Lubricants, 2020
Scott Halley, Timothy Newcomb, Richard Vickerman
The core of a CVT is similar to that of an ATF but with special emphasis on metal-to-metal friction characteristics for the belt and pulley (Figure 34.7). CVT fluids are designed to lubricate the metal-to-metal contact zone between the belt and pulleys while maintaining a high metal-to-metal friction coefficient for efficient torque transfer. In addition, the CVT fluid must protect the system from wear (12). The portion of the belt that rides on the variator is finely serrated and those serrations must be protected. If these serrations wear away, the surface area engaging the variator will increase, the effective coefficient of friction will decrease leading to belt slip and transmission failure.
A Review Analysis on Performance and Classification of Wind Turbine Gearbox Technologies
Published in IETE Journal of Research, 2022
A continuously variable planetary transmission design is owned by Fallbrook Technologies is named as a F-CVT. This is totally different from the traditional planetary gearbox of the wind turbine system. This new scalable transmission can improve the performance and efficiency of the wind turbine. On comparing with other transmission technologies of wind power generation, the installation cost and the device cost are too low for F-CVT. This consists of 3–20 balls, depending on the torque capacity of the wind turbine used. As the F-CVT diameter is kept constant and the number of balls provided can increase the torque capacity. The ball variator is placed between the input and output disk as shown in Figure 5(d). The transmission ratio is changed by varying the angle of the rotational axis of the balls. The variator transfers power between the input and output disk with an infinite number of gear ratios. By adjusting the gear ratio according to the wind speed variation, the output disk power is maintained within the required limit as shown in Table 6 [23]. This ball variator transmission component allows smooth and continuous power transmission even for any range of wind variations [86].