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Research and Development of Chain Saw Driven by Horizontally Opposed Twin Cylinder Two-stroke Gasoline Engine
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English
Abstract
The chain saw engines are single-cylinder, the vibration of the engines themselves are significant. To minimize the vibratory acceleration transmitted to the handles from this sources, an anti-vibration device is required to damp vibration suitably. This type of anti-vibration device, however, requires a rather soft spring constant and anti-vibration rubber bushings with high deformation, that is the size and bulkiness of which not only make forestry work difficult, but also dangerous.
To resolve these problems it is essential to reduce the vibration acceleration as far as possible by optimizing engine balance. The two stroke cycle horizontally-opposed 2-cylin-der simultaneous-ignition engine provides the best balance for chain saw applications, and research and development was advanced on this basis.
The results showed a reduction in vibration acceleration level at the engine itself to about 10% of conventional 1-cylinder chain saw engine, and reduction in the handles to about 20%.
The objectives of the development project for a low-vibration chainsaw have been almost completely reached, and user evaluations support the excellent test results concerning noise reduction.
Authors
Citation
Inaga, H., Ohno, S., Kamata, Y., Fukuoka, T. et al., "Research and Development of Chain Saw Driven by Horizontally Opposed Twin Cylinder Two-stroke Gasoline Engine," SAE Technical Paper 870992, 1987, https://doi.org/10.4271/870992.Also In
References
- Tomizuka Kiyoshi “Research for the Two-stroke Cycle Engine” Yokendo Tokyo 1966
- Kumagai Seiichiro “Story of the Engines” Iwanami Shoten Tokyo 1981
- Smith Philip H. “The High-speed Two-stroke Petrol Engine” T. Foulis & Co., Ltd. London 1965
- Thompson W. “Fundamentals of Automotive Engine Balance” Mechanical Engineering Publications Ltd. London 1978
- Inaga Hisashi “Research and Development of a Low-vibration and Low-noise Chain Saw” Journal of industrial Hygiene of Japan 22 1983
- Stokes Bryce J. “Opposed-cylinder and Single-cylinder Chain Saw Study” United States Department of Agriculture Forest Service, Report 4720 1984
- Hartsough Bruce R. Ashmore Colin Stokes Bryce J. “Modeling Vibration of a Two-cylinder Chain Saw” American Society of Agricultural Engineers”, Paper No. 84-1617 1984
- Takimoto Yoshihiko “The Vibration Characteristics of a Chain Saw fitted with a Two-cylinder Engine” Paper for the 8th Joint Ergonomics Symposium Silsoe, England 1985
- Takimoto Yoshihiko “The Vibration Characteristics of a Chain Saw fitted with a Two-cylinder Engine and the Measuring Method” The 18th IUFRO World Congress Ljubljana, Yugoslavia 1986
- Fushimi Tomomichi “Studies on the Operation Control of the Chain Saw during the Felling and Bucking Work of the Two-cylinder Chain Saw” Ehime University, Faculty of Agriculture 1986
- Takimoto Yoshihiko “Research for the Characteristics of Chain Saw Vibration” Kyoto University, Faculty of Agriculture 1987
- Rummer R. Smith T. Stokes B. “Two-cylinder Chain Saw Vibration and Noise Test” American Pulpwood Association Inc. Technical Release April 1985 U.S.A.
- Stokes Bryce J. “Twin-cylinder Chain Saw reduces Vibration Levels” Forest industries May 1986 U.S.A.