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Mechanism of Occurrence of Ghost Noise in Helical Gears Resulting from Thread-type Tool Machining

Article of Honda R&D Technical Review Vol.20 No.2

Summary

Specifying the origins of ghost noises produced at non-integral multiples of gear meshing order frequency from the order at which they occur represents a challenge, and determining countermeasures for these forms of noise has involved a process of trial and error. Today, with the widespread use of a method of continuous generation involving the use of a multiple-thread-type tool for high production efficiency in the process of grinding the flanks of the helical gears used in automotive transmissions, new ghost noises have appeared. The research discussed in this paper clarified the mechanism behind the production of the ghost noises that have become noticeable as a result of the use of the multiple-thread-type tool, and identified the relationship between the conditions used in the grinding process and the orders at which the noises occur. By verifying these findings in an actual transmission and studying countermeasures, the project demonstrated that ghost noises could be reduced by modifying the conditions used in the grinding process.

Reference

(1) Matson, G. A., Houser, D. R.: The Use of Ghost Noise as an Exciter for High Frequency Gear System Dynamics, International Conference on Gears, VDI, p. 739-750
(1996)
(2) Matsumura, S., Kitahara, A., Houjoh, H.: Prediction of Ghost Noise Occurrence on Ground Helical Gears with Detailed Surface Measurement (Gear Dynamics and Noise) , Proceedings of The JSME International Conference on Motion and Power Transmissions, p. 79-83 (2001)
(3) Ratanasumawong, C., Matsumura, S., Houjoh, H.: Inspection of Tooth Surface Geometry by Means of Vibration Measurement, JSME International Journal, Series C, Vol. 48, No. 4, p. 704-714 (2005)
(4) Mark, W. D.: Contribution to the vibratory excitation of gear systems from periodic undulations on tooth running surfaces, The Journal of the Acoustical Society of America, Vol. 91, Issue 1, p. 166-186 (1992)

Author (organization or company)

Ryo EGAMI(Automobile R&D Center)、Tadami KONDO(Automobile R&D Center)、Motoki IKUMA(Honda Motor Co., Ltd.)

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