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Development of Horizontally-opposed Six-cylinder Engine for 2018 Gold Wing

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

Summary

On the basis of the concept of new Gold Wing, the new horizontally-opposed six-cylinder power unit was developed with the theme “smooth yet aggressive at times, light weight and compact flat-six power unit.” To achieve weight reduction and compactness of the power unit, the materials and the shapes of the crankshaft and the connecting rods were redesigned. To realize lightweight and compact power unit, the Unicam valve train having finger follower rocker arms for the intake valves and the single throttle body were applied. To enhance combustion efficiency, the combustion chamber was changed from bathtub type for two valves, to the pent roof type for four valves. In addition, the compression ratio was increased and the intake ports were applied with a shape generating a strong tumbling of intake air. To enhance maneuvering qualities, which was derived from the set concept of the developed motorcycle, a throttle-by-wire system was adopted. To the drive system of the Integrated Starter Generator, a damper of revised configuration and a rubber coupling were implemented and the requirements for tranquil riding were fulfilled. A comfortable exhaust sound was also provided by reassessing the design of the exhaust system. With all the measures mentioned above, weight reduction, together with downsizing, was successfully achieved by 7.1 kg for the DCT equipped model and by 9.5 kg for the MT equipped model compared to the previous model. Furthermore, the peak output power was increased by 6 kW and, yet, the fuel economy was improved by 24% (in the case of the model sold in Japanese market) in the WMTC mode (class 3-2). As mentioned above, the enjoyably deep and pulsated exhaust sound was also achieved while offering the mild and high quality sounds of mechanical operations.

Reference

(1) Hirayama, T., Yokogawa, Y., Fujimoto, Y.: Development of 7-speed Dual Clutch Transmission for 2018 Gold Wing, Honda R&D Technical Review, Vol. 30, No. 2, p. 31-37
(2) Hoshi, N., Shimura, Y., Okuma, T., Nomura, A., Gogo, K.: Introduction of CRF450R Equipped with 4-Stroke Engine, Honda R&D Technical Review, Vol. 14, No. 1, p. 21-30
(3) Inui, H., Sato, E., Kaji, T., Shigezumi, S.: Development of Aluminum Powder Metal Composites Material for Cylinder Sleeves Suitable for Extrusion Process, Transactions of Society of Automotive Engineers of Japan, Vol. 46, No. 2, p. 545-550, (2015) (in Japanese)
(4) Aoki, M., Tosaka, T., Minami, H., Ishihara, H., Kano, K.: Introduction of Gold Wing GL1800, Honda R&D Technical Review, Vol. 13, No. 2, p. 13-26
(5) Ishihara, Y., Hamakawa, T., Satoh, K., Yamasaki, T., Shi, C., Hashimoto, H., Haneda, H., Takahashi, S.: Prediction of Fracture of Cylinder Block Main Bearing by Fretting Fatigue and Development of Verification Method, Honda R&D Technical Review, Vol. 28, No. 1, p. 191-196
(6) Tanaka, K., Sugita, H., Saito, H., Sekita, M.: “Design Method of Motorcycle Exhaust Sound Fitting to Vehicle Concept Regardless of Engine Configurations” SAE Technical Paper 2014-32-0121, 2014, doi:10.4271/2014-32-0121

Author (organization or company)

Hiroshi YOKOTA(Motorcycle R&D Center)、Satoru NOJIMA(Motorcycle R&D Center)、Yutaka SONODA(Motorcycle R&D Center)、Yusuke OSAKI(Motorcycle R&D Center)、Masahiro KONTANI(Motorcycle R&D Center)、Satoru YAMASAKI(Motorcycle R&D Center)

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