Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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Performances of Plastic Pulley with High Mechanical Properties and Low Friction

  • Kim, Namil (Environmental Materials R&D Center, Korea Automotive Technology Institute) ;
  • Lee, Jung-Seok (Research and Development Center, ENA Industry) ;
  • Hwang, Byung-Kook (Technical Center, Gates Korea) ;
  • Bae, Seokhu (Environmental Materials R&D Center, Korea Automotive Technology Institute) ;
  • Yoon, Jeong-Hwan (Environmental Materials R&D Center, Korea Automotive Technology Institute) ;
  • Yun, Juho (Environmental Materials R&D Center, Korea Automotive Technology Institute)
  • Received : 2019.05.16
  • Accepted : 2019.06.04
  • Published : 2019.06.30
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Abstract

Polyphenylene sulfide (PPS) was filled with glass fiber (GF), aramid fiber (AF), and solid lubricants to improve the mechanical properties and wear resistance. The addition of GF effectively enhanced the tensile strength, flexural modulus, and impact strength of PPS, while solid lubricants such as polytetrafluoroethylene (PTFE), molybdenum disulfide ($MoS_2$), and tungsten disulfide ($WS_2$) lowered the friction coefficients of the composites to below 0.3. The ball nut and motor pulley of the electric power steering (EPS) were manufactured using the PPS composites, and feasibility was ascertained thereafter by conducting the durability test. The composites filled with GF and AF showed high mechanical strength, but slip occurred at the interface between the pulley and belt while testing above $50^{\circ}C$. When small amounts of lubricants were added, the slip was no longer detected because of the suppression of friction heat. It is realized that the low friction as well as high mechanical properties is important to ensure the reliability of plastic pulleys.

Keywords

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Figure 1. The equipment used for (a) friction test of composites and (b) durability test of the motor and ball nut pulley.

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Figure 2. The effect of glass fiber content on (a) tensile strength, (b) flexural modulus, and (c) izod impact strength of PPS.

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Figure 3. Effect of aramid fiber content on (a) tensile strength, (b) flexural modulus, (c) izod impact strength of PPS, and (d) tensile strength, (e) flexural modulus, (f) izod impact strength of PPS/20 wt% glass fiber composites.

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Figure 4. Comparison of (a) tensile strength, (b) flexural modulus, (c) izod impact strength of PPS composites containing 20 wt% glass fiber/5 wt% aramid fiber, and (d) tensile strength, (e) flexural modulus, (f) izod impact strength of PPS composites containing 30 wt% glass fiber/5 wt% aramid fiber by addition of 5 wt% and 10 wt% graphite, PTFE, MoS2, WS2.

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Figure 5. SEM images of the fractured surface of PPS/glass fiber/aramid fiber/solid lubricant composites.

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Figure 7. The comparative picture of motor and ball nut pulley after durability test. Each pulley was manufactured using the PPS composites containing different solid lubricant.

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Figure 6. (a) Representative friction evolution curve of PPS/glass fiber/aramid fiber/solid lubricant composites as a function of sliding time and (b) the comparative picture of each specimen before and after friction test.

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