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Vibration Reduction Technology with Mount Rubber for Outboard Motors BF4/5/6

Article of Honda R&D Technical Review Vol.30 No.1


When the BF5 outboard motor underwent a model change recently, a model was added with 20% more output, with faster engine speed and a higher compression ratio, even as it kept the same balancer-less engine and the same basic frame structure. The development discussed in this paper enhanced the customer appeal of the outboard motor by reducing handle vibration and yawing while idling. The mount rubber is a critical component for reducing vibration, as it transmits the thrust of the outboard motor and absorbs vibration. The specs of the mount rubber can also be changed. As such, the mount rubber became the focus of this study. Changing the characteristics of the mount rubber resulted in maintaining about the same level of handle vibration at the maximum speed, with only half as much yawing while idling, even though the new outboard motor had greater output.


(1) Shiomi, K., Okada, T., Ohkawa, M., Ikeno, T.: Reducing vibration of a 2-cylinder outboard motor by the pendulum motion mount method, SETC Technical Paper 2001-01-1870
(2) Okada, T., Shiomi, K., Ikeno, T., Tomatsu, T., Okuma, M.: Engine Mount Characteristics Identification of Large Outboard Motor Using Experimental Modal Analysis, SETC Technical Paper 2006-32-0083

Author (organization or company)

Yasukata KOHASHI(Power Products R&D Center)、Takeshi OKADA(Power Products R&D Center)、Yoshihiro HARADA(Power Products R&D Center)

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