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Development of Evaluation Method for Waviness Property on Hypoid Gear Tooth Surface

Article of Honda R&D Technical Review Vol.30 No.2

Summary

Measuring and analysis methods have been discovered for quantitative evaluation of tooth surface waviness, which cause high-order sound radiation from hypoid gears. Tooth surface waviness was measured by an optical, non-contact 3D measuring device. Taking this measurement result, images were filtered by applying a 2D Fourier Transform and inverse Fourier Transform to extract the cyclical waviness components impacting gear noise frequencies. The method was used to evaluate tooth waviness of hypoid gear in an actual gearbox unit. The cyclical peak order of the waviness matched the peak order of frequencies of sound radiation from gears. In addition, upon evaluating multiple specimen gears, a quantitative correlation was found between the amplitude of peak order waviness and the pressure level of sound radiation from gears. This has newly made quantitative evaluation of hypoid gears in isolation possible.

Reference

(1) Kato, S.: Haipoidogiya Seido Sokuteigijutsu ni Kansuru Kenkyu, Kyoto University thesis for doctor, 205 p., (1996) (in Japanese)
(2) Shibata, Y., Maki, H., Mori, K.: Influence to Transmission Error Such as Tooth Flank Modifications and Pitch Deviation in Meshing of Gears, TOYOTA Technical Review, Vol. 52, No. 2, p. 40-47, (2002)
(3) Watanabe, T., Shiraki, K.: Fundamental Investigation of Hypoid Gear Noise and Vibration Using Gearbox Test Facility, Subaru Technical Review, No. 41, p. 138-144, (2014)
(4) Egami, R., Kondo, T., Ikuma, M.: Mechanism of Occurrence of Ghost Noise in Helical Gears Resulting from Thread-type Tool Machining, Honda R&D Technical Review, Vol. 20, No. 2, p. 108-115

Author (organization or company)

Takeshi HORI(Automobile R&D Center)、Naoto SHUKUSHIMA(Automobile R&D Center)

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