| DEVELOPMENT OF THE WEAR RESISTANT BALL NUT ASSEMBLY IN THE RACK-BASED ELECTRIC POWER STEERING |
| Soo Sik Chung1, Young Ze Lee2, Eun Seok Kim2 |
1Hyundai Kia R&D Center
2Sungkyunkwan University |
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| ABSTRACT |
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Electric Power Steering (EPS) is rapidly evolving in terms of performance. However, the abnormal noise from steering, which is experienced by the drivers, reduces the perfection of performance. In this study, the deterioration of Rackbased Electric Power Steering (R-EPS) samples by mileage was analyzed to investigate the cause of steering abnormal noise in the R-EPS applied to a large-sized luxury vehicle that is more sensitive to noise. The results from our analysis showed that the ball nut and screw in the ball nut assembly of R-EPS were in the mode of normal wear. However, the steel ball between the ball nut and screw showed irregular wear mode. It was found that the ball Φ5 has a larger contact area than the ball Φ4, which is advantageous for abrasion and irregular wear because stress is dispersed in the load. Moreover, the ball with Φ5 was superior to the ball with Φ4 in the results of abrasive and adhesive wear tests verified by the ball-on-disk test. Therefore, in the future R-EPS development, the ball with Φ5 compare to the ball with Φ4 should be proposed for the ball nut assembly. This is in order to eliminate the potential cause of steering abnormal noise. |
| Key Words:
Electric power steering (EPS), Rack-based electric power steering (R-EPS), Ball-on-disk, Ball nut assembly, Steering abnormal noise |
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Corresponding Author.
Young Ze Lee , Email. 
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