NTN Exhibits at Electric Vehicle Development Technology Exhibition (EVEX) 2012
By-wire system concept (wire-frame model)
High Speed and Low Torque Deep Groove Ball Bearing for EV/HEV
Rotation torque with oil lubrication has been reduced to 50% or less at high rotational speeds of 30,000 min-1 (1.2 million DN*). A new cage has been used to limit distortion at high rotational speeds due to centrifugal forces, while also restricting the amount of grease flowing into the bearing to reduce stirring resistance. The internal design of the bearing has also been optimized to reduce rolling viscosity resistance.
*: DN = D (bearing internal diameter, mm) × N (rotational speed, min-1)
Linear Type Electric Actuator
The rotation output of drive motors can be converted to linear movement with a high level of response and thrust. It features a compact design using a high-efficiency ball screw shaft as at output axle. The unit incorporates an IC sensor that can directly detect the output axle stroke position.
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