Abstract

An issue involving noise reduction due to an abnormal noise from the oil filter arose during the development of an overdriven compact oil pump. This issue was approached by focusing on the amplitude of the oil pressure fluctuation at the pump discharge side (hereafter oil pressure fluctuation amplitude) which was the excitation force. Noise reduction was implemented using technology to reduce the oil pressure fluctuation amplitude. This involved revising the number of teeth in the rotor and changing the characteristics of the opening of the relief valve.A small-diameter, multi-toothed compact rotor was developed to take full advantage of compactness and low friction for the 2003 Accord. The number of teeth in the inner rotor was increased from four to eight, thus reducing the oil pressure fluctuation force. The relief valve was also given additional pre-relief holes in order to improve the response at the valve opening timing, with the objective of improving the product’s marketability with respect to noise and vibration.

References

1. (1) Committee on Editing of Oil Pressure Technologies handbook: Pressure technology handbook, New edition, Nikkan Kogyo Shinbun, p. 267 (1976)
2. (2) Japan Society of Mechanical Engineers: Mechanical engineering handbook, Edition 6, Tokyo, Japan Society of Mechanical Engineers, pp. 9-86 (1977)

Author (organization or company)

• Koji HIRANO（Tochigi R&D Center）
• Hisayuki HASHIMOTO（Tochigi R&D Center）
• Masakazu KINOSHITA（Tochigi R&D Center）
• Yasunori ONO（Yamada Seisakusho Co., Ltd.）
• Yoshiaki SENGA（Yamada Seisakusho Co., Ltd.）

Publication Information

Article of Honda R&D Technical Review Vol.14 No.2 (203 - 210)

PDF

Citation Information