Abstract

A 90-degree V-twin OHC vertical shaft engine for riding mowers has been developed. The V-twin cylinder layout and the aluminum sintered alloy connecting rod enabled the offset between cylinders to be decreased, the weight of the reciprocating parts to be reduced and the vibration level to be reduced by 50% compared to conventional single cylinder engines. The OHC construction with built-in timing belts, plastic cam pulleys and a turbo shaped cooling fan facilitated a noise level reduction of 4 dB compared to conventional single cylinder engines. Further, ease of assembly was improved with the application of uni-block cylinders, common parts for both cylinders and sub-assembly constructions. The engine size and cost are comparable to those of conventional single cylinder engines.

References

1. (1) Takashi SUZUKI, Hiroshi HOJO, Satoshi INOUE, Hiroshi MORIYAMA, Yoji FUJINAGA: “Development of a General Purpose OHC Engine with Built-in Timing Belt”, HONDA R&D Technical Review, vol.10, pp.122-127 (1998)
2. (2) Shoji KAWASE, Hideo URATA, Zenzo ISHIJIMA, Hideo SHIKATA: Development of a Powder Metal Forged Al-Si Alloy for Connecting Rods”, HONDA R&D Technical Review, vol.9, pp.197-205 (1997)

Author (organization or company)

• Akihisa SHINODA（Asaka Higashi R&D Center）
• Hiroshi MORIYAMA（Asaka Higashi R&D Center）
• Takashi SUZUKI（Asaka Higashi R&D Center）
• Yutaka TABATA（Asaka Higashi R&D Center）

Publication Information

Article of Honda R&D Technical Review Vol.12 No.2 (23 - 28)

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Citation Information