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No.1015E 2018Special Edition on Enviromental Technologies Development of Spacer Balls for Rack Parallel Type Electric Power Steering

Category TECHNICAL REPORT
Author M. ASAKURA　K. UCHIYAMA
Steering System Engineering Dept. 2, Steering Systems Business Headquarters
S. INOUE
Experiment & Analysis Dept. 2, Steering Systems Business Headquarters
Abstract We have developed rack parallel type electric power steering (RP-EPS) for large and premium class vehicles. Premium class vehicles require high quality in terms of the steering feeling. In order to provide smooth steering, spacer balls were adopted in the ball screw of RP-EPS. Torque variation is reduced signifi cantly as the spacer balls have the effect of reducing the slip between balls. In addition, in accordance with reduced slip, the durability of the ball screw was also improved.
Keyword electric power steering, torque variation, ball screw, spacer balls
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Summary:5,2023-4,2024