Abstract
The friction characteristics of a shock absorber are very complex because the reciprocating motion is not always identical. In this study a device was developed and used to analyze the dynamic friction characteristics under various reciprocating sliding conditions to determine the sliding materials and hydraulic oils that improve the shock absorber performance. This study describes the influence of hydraulic oil additive on the fine reciprocating friction characteristics of steel and copper alloy. Hydraulic oils were prepared by blending a paraffinic mineral oil with zinc dithiophosphate (ZnDTP) and polyhydric alcohol ester as additives. The results show that the dynamic frictional characteristics vary mainly depending on the additive concentration. A specific additive formulation induces a unique amplitude-dependent friction behavior. In addition, the influence of different additives on the lubrication mechanism is investigated based on the instrumental analysis of the friction surface.
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Shinji KATO He joined KYB Corporation from 1987. His current position is senior staff manager of Engineering Headquarters of Automotive Components Operations, after manager of Materials Engineering Section in Basic Technology R&D Center. He is responsible person in developing sliding elements in shock absorbers. He completed coursework of doctoral program at Tokyo University of Science without degree in 2018.
Shinya SASAKI He received his bachelor, M.S., and Ph.D. degrees from Tokyo University of Technology, Japan, in 1984, 1986, 1991, respectively. He joined Mechanical Engineering Laboratory of AIST, MITI, Japan from 1986. His current position is a professor of Tokyo University of Science, Japan. His research areas cover the surface modification, surface texturing, tribo-chemistry, nano-mechanical analysis, and additive manufacturing by metal 3D printing technology.
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Kato, S., Sasaki, S. Effects of hydraulic oil and lubricant additives on dynamic friction properties under various reciprocating sliding conditions. Friction 8, 471–480 (2020). https://doi.org/10.1007/s40544-019-0296-0
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DOI: https://doi.org/10.1007/s40544-019-0296-0