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Analysis of the Accessory Belt Running Off of the Pulley in Automotive Engines

Article of Honda R&D Technical Review Vol.12 No.1

Summary

Having established the measurement technology to measure accessory belt behavior using laser displacement measurement methods, we were able to clarify the mechanisms causing the belt to run off of the pulley by analyzing the correlation between the belt’s behavior and fluctuations in input to the belt and by performing belt behavior simulation. Based on our findings, we were able to create a design tool. We clarified the fact that the belt runs off of the pulley if a resonance occurs due to the accessory belt’s natural frequency equaling 1/2 of the frequency of belt length fluctuation in the belt tension direction caused by crankshaft torsional vibration and if the length fluctuation in the belt tension direction exceeds a threshold value. We also found that lateral vibration occurred due to the existence of a lateral movement natural vibrational mode in the belt itself. Based on our findings, we created a belt movement limit map and constructed a belt run off simulation enabling us to propose design tools to prevent the belt from running off of the pulley. In addition, we provided an example of a method used to investigate the prevention of the belt running off the pulley by presenting the effects of design parameters for crankshaft related parts.

Reference

(1) Osamu Taniguchi: Kaitei Shindou kougaku, Corona Publishing Co., Ltd., Tokyo, p.130-132(1985) (Written in Japanese)

Author (organization or company)

Atsuo FUJII(Tochigi R&D Center)、Shougo YONEMOTO(Tochigi R&D Center)、Kazuma OKUDA(Tochigi R&D Center)、Kiyoshi MIYAZAKI(Tochigi R&D Center)、Hiroshi MIYAZAWA(Tochigi R&D Center)、Seiji FURUMATA(Tochigi R&D Center)

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