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<p>Continuously growing demands on user experience determine the gearbox NVH to be held at a&#xa0;minimum. Plastic gears show great potential to tackle the NVH challenges of modern gearboxes. Switching from a&#xa0;steel gear pair to a&#xa0;steel/plastic or plastic/plastic combination enables an easy and substantial reduction of noise and vibrations. Selecting a&#xa0;right material pairing can lead to great improvements. There are several open topics on the plastic gears NVH, which still need to be addressed and systematically studied. When considering plastics, different material pairings show different NVH performance. Selecting the right one for the application of interest is the key that leads to best possible results. It is well accepted by the professional public that the plastic gear NVH increases with the increasing wear on the gears. To the best of author’s knowledge there have not been any relevant studies published yet, where the wear’s effect on the NVH would be systematically studied and evaluated. A&#xa0;similar open topic is also the effect of the grease. It is generally accepted that introducing grease to the gearbox the noise and vibrations get reduced. It would however be valuable to have such effect more systematically quantified. Within the study, six different material combinations of a&#xa0;drive and driven gear were studied in terms of gear NVH, employing material combination steel/steel—as a&#xa0;reference, comparing to steel/plastic and plastic/plastic combinations. The second part of the study investigates how increasing wear and additional of grease affect the resulting NVH. Plastic gear pairs demonstrated up to 10 dB lower sound pressure levels compared to steel gears. The best NVH performance was achieved with the POM—PA66 + 30%GF combination. Wear increased sound pressure by 4–6 dB, and grease lubrication significantly reduced NVH, especially at higher speeds.</p>

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An investigation on the NVH performance of plastic gears

  • 期刊论文

  • 发表日期：

    2025年9月4日

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  • Damijan Zorko,
  • Rok Kalister,
  • Borut Černe

摘要

Continuously growing demands on user experience determine the gearbox NVH to be held at a minimum. Plastic gears show great potential to tackle the NVH challenges of modern gearboxes. Switching from a steel gear pair to a steel/plastic or plastic/plastic combination enables an easy and substantial reduction of noise and vibrations. Selecting a right material pairing can lead to great improvements. There are several open topics on the plastic gears NVH, which still need to be addressed and systematically studied. When considering plastics, different material pairings show different NVH performance. Selecting the right one for the application of interest is the key that leads to best possible results. It is well accepted by the professional public that the plastic gear NVH increases with the increasing wear on the gears. To the best of author’s knowledge there have not been any relevant studies published yet, where the wear’s effect on the NVH would be systematically studied and evaluated. A similar open topic is also the effect of the grease. It is generally accepted that introducing grease to the gearbox the noise and vibrations get reduced. It would however be valuable to have such effect more systematically quantified. Within the study, six different material combinations of a drive and driven gear were studied in terms of gear NVH, employing material combination steel/steel—as a reference, comparing to steel/plastic and plastic/plastic combinations. The second part of the study investigates how increasing wear and additional of grease affect the resulting NVH. Plastic gear pairs demonstrated up to 10 dB lower sound pressure levels compared to steel gears. The best NVH performance was achieved with the POM—PA66 + 30%GF combination. Wear increased sound pressure by 4–6 dB, and grease lubrication significantly reduced NVH, especially at higher speeds.