Abstract
Motors of electric vehicles (EV) are required to rotate at higher speed to realize higher output per weight of motors. The higher rotation speed makes noises of gear drives. To address the noise problem, traction drive can be a useful method, which utilizes the shear resistance of oil membrane between two rollers. It is necessary for efficient power transmission to optimize the contact force between rollers. In this paper, a piezoelectric actuator is used to adjust the contact force between rollers. We propose a contact force adjusting method named "Pull-out method". In this method, the specific contact force is previously applied by bolts, and piezoelectric actuators reduce the force. It is a fail-safe method because it can keep power transmission between rollers even if actuators are broken out. Pull-out two-disk machine, which is equal-reduction-ratio traction drive roller device, is developed. An experiment with the two-disk machine has been conducted to measure slip ratio and efficiency in six loading conditions. The experiment has confirmed two insights: (1) the possibility of adjusting the contact force using piezoelectric actuator, and (2) the feasibility of "Pull-out method".
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