NTN Corporation (hereinafter referred to as NTN) developed a thin, lightweight hollow ball screw units "is designed to electrification various vehicle actuator. The CVT (hereinafter referred to as CVT * 1) have been increasingly used in vehicle transmission, in recent years, and function of the driving mechanism of the hydraulic pump, which adjusts the width of the pulley. However, hydraulic CVT is mainly the energy loss during the operation, suffer from the problems when trying to use a more compact design. Electrically controlled continuously variable transmission to provide a more precise gear CVT than the oil hydraulic control and use of the sliding screw drive mechanism, but these slides screws consume a lot of electrical power conversion efficiency due to its low thrust. The hollow ball screw units "NTN developed using a ball screw having a low rolling resistance, to provide double the efficiency of the thrust conversion, while the hollow screw shaft means, they may be along the same axis of the CVT pulley mechanism. Cut out of the spiral groove and the ball circulation groove while in the hollow of the screw shaft, eliminating the separate "deflector" materials, including the installation of the need in the nut on the side of the S-shaped ball circulation groove. The nuts can design thinner, lighter deflector. As a result of these improvements, the use of "hollow" electrically controlled continuously variable drive mechanism, the ball screw portion helps to reduce the loss of energy and electronics pulley operation, and also allows by using arranged on the same axis, the CVT becomes more compact. It can also contribute to a lighter, more fuel-efficient operation of the vehicle. NTN will actively recommend the hollow ball screw and actuator unit electrification CVT transmission installed in the automobile and motorcycle use hollow ball screw is expected to grow to future. "CVT" Abbreviation of the CVT. [Features] (1) Thrust rotational force conversion efficiency of 70% or more (double sliding screw) (2 pulley width adjustment pulley transmission mechanism best gear ratio, improve the fuel efficiency of the transmission system.) Thin, light weight: through integration circulation tank with the screw shaft (20% by weight compared to deflector circulation method) [Application] electronic actuator, the pulleys used to drive the electronic control of the belt-driven CVT ball screw actuator of the vehicle and motorized a thinner design of the car