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Development of Aluminum Alloy Rear-wheel Hub with Lightweight and High Strength for Off Road Motorcycles

Article of Honda R&D Technical Review Vol.17 No.1


A rear-wheel hub with lightweight and high strength that satisfies the needs for motocross riding and contributes considerably to the vehicle mass reduction has been developed. To reduce material, a hollow structure is used in the thick section of the flange on the sprocket side of the wheel hub, which transmits driving force. The thin-wall design is employed in the straight, cylindrical section of the hub. To maintain necessary strength of the structural part, the die-casting method, which is most suitable for a thin-wall product, is applied. With regard to the casting, the inner structure quality is ensured by applying a molten metal treatment, reducing the amount of gas by evacuating the cavity and providing a squeezing function after plunger ejection. As for the material, an Al-Si-Mg alloy is employed and T5 heat treatment is applied. Thus, the yield strength is improved by 27% and the tensile strength is increased by 30% compared to the conventional material.


(1) Watanabe, S.: Jidousya Buhin you Kou Ensei Daikasuto Goukin no Kaihatsu, Al-aru, Dec, p. 13-17 (2002) (In Japanese)
(2) Handbook of Advanced Aluminum Technology, Light Metal Publishing Co., Ltd
(3) Kenkyu Houkoku 74 Daikasuto no Tyuzou Kekkan to Taisaku, Japan Foundry Engineering Society (1996) (In Japanese)

Author (organization or company)

Masaki AGATA(Asaka R&D Center)、Mikio UCHIYAMA(Asaka R&D Center)、Yasuki ITO(Asaka R&D Center)、Kyo TAKAHASHI(Asaka R&D Center)

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