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Compact and Long-Stroke Multiple-Link VCR Engine Mechanism
Technical Paper
2007-01-3991
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A multiple-link variable compression ratio (VCR) mechanism is suitable for a long-stroke engine by providing the following characteristics: (1) a nearly symmetric piston stroke and (2) an upper link that stays vertical around the time of the maximum combustion pressure. These two characteristics work to reduce force inputs to the piston. The maximum inertial force around top dead center is reduced by the effect of the first characteristic. The second characteristic is effective in reducing piston side thrust force and helps ease piston pin lubrication. Because of the combined effect of these characteristics, the piston skirt can be made smaller and the piston pin can be shortened. That makes it possible for the piston skirt and piston pin to move between the counterweights, resulting in a downward extension of the piston stroke. As a result, a longer-stroke engine mechanism can be achieved without making the cylinder block taller.
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Authors
Citation
Tomita, M., Aoyama, S., Ushijima, K., Tanaka, Y. et al., "Compact and Long-Stroke Multiple-Link VCR Engine Mechanism," SAE Technical Paper 2007-01-3991, 2007, https://doi.org/10.4271/2007-01-3991.Also In
References
- Moteki K. et al. “A Study of a Variable Compression Ratio System with a Multi-Link Mechanism” SAE Paper 2003-01-0921
- Takahashi N. et al. “A Study Concerning the Noise and Vibration Characteristics of an Engine with Multi-Link Variable Compression Ratio Mechanism” SAE Paper 2005-01-1134
- Hiyoshi R. Aoyama S. Takemura S. Ushijima K. Sugiyama T. “A Study of a Multiple-link Variable Compression Ratio System for Improving Engine Performance” SAE Paper 2006-01-0616
- Tanaka Y. et al. “A Study of a Multiple-Link Variable Compression Ratio Mechanism for a VCR Engine” APAC-14 2007-01-3547
- Sugiyama T. et al. “Technology for Improving Engine Performance using Variable Mechanisms” SAE Paper 2007-01-1290
- Takemura S. Aoyama S. Sugiyama T. Nohara T. Moteki K. Nakamura M. Hara S. “A Study of a Continuous Variable Valve Event and Lift (VEL) System” SAE Paper 2001-01-0243
- Nakamura M. Hara S. Yamada Y. Takeda K. Okamoto N. Hibi T. Takemura S. Aoyama S. “A Continuously Variable Valve Event and Lift Control Device (VEL) for Automotive Engines” SAE Paper 2001-01-0244
- Arinaga T. et al. “A Study of Friction Characteristics of Continuously Variable Valve Event & Lift (VEL) System” SAE Paper 2006-01-022
- Tsuchida H. et al. “The Effect of a Longer Stroke on Improving the Fuel Economy of a Multiple-Link VCR Engine” SAE Paper 2007-01-4004