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Evaluation Condition for Auxiliary Belt Tension Fluctuation in Engine Bench Test

Article of Honda R&D Technical Review Vol.24 No.1

Summary

In order to evaluate the reliability of an auxiliary belt system consisting of a Poly-V belt and the auxiliary equipment driven by that belt, it is necessary to measure belt tension fluctuation that becomes an input load to the auxiliary component parts. This study proposes an example of a measurement method, clarifies the conditions that increase belt tension fluctuation in the actual use condition, and describes the engine running condition when substituting the actual vehicle running condition with an engine bench. The proposed measurement method enables measurement with the engine in the actual vehicle condition, and does not require changes to the auxiliary belt layout. Strain gauges are adhered to the auxiliary part adjacent to the span where the maximum belt tension fluctuation occurs, and the strain due to the belt tension fluctuation at that position is measured. The measured strain is then converted to the belt tension fluctuation using the calibration equation of belt tension and strain. In order to substitute actual vehicle tests with evaluation by engine bench tests, it is necessary to apply the running condition that results in the maximum belt tension fluctuation as the measurement condition. This requires measurement in the engine starting and compressor on/off conditions, which are transient conditions unique to an actual vehicle, in addition to the condition in which the engine speed is increased at the engine full load plus auxiliary maximum load.

Reference

(1) Watari, A.: Forced vibration, Kikaishindou, Maruzen publishing CO., LTD., p. 103-107 (1966) (in Japanese)
(2) Sakata, M.: Vibration of degree-of-freedom, Forced vibration, Hadoutoshindounokougaku, Kyoritsu shuppan CO., LTD, p. 53-59 (1980) (in Japanese)
(3) Meirovitch, L.: Forced vibration of single-degree-of-freedom system, Elements of vibration analysis, Burein tosyo CO., LTD., p. 39-46 (1984)
(4) Sato, K., Mikuriya. I.: Compact Clutch Integrated Pulley for Alternator, NTN Technical Review, No. 75, p. 123-127 (2007) (in Japanese)

Author (organization or company)

Hiroki TAKAZAWA(Automobile R&D Center)

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