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A Study on Lubricating Oil Flow into the Combustion Chamber for the Top Ring with a Special Joint
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English
Abstract
The authors have utilized a modified engine with a transparent glass cylinder for motoring equipment. The effect of the top ring which has a special joint (triangle step joint) on the lubricating oil flow was examined.
The results indicate that the lubricating oil flow is considerably reduced by utilizing the top ring with a special joint (triangle step joint) as compared to a standard joint (straight joint). We have also found that if the modified engine is operated with attention to the pressure difference between intake manifold and crankcase, or the positions of the piston ring gaps, the lubricating oil flow is reduced by utilizing a two piston ring set (where a top ring and an oil ring are set on a piston) with the top ring having a special joint and without the second ring as compared to a three piston ring set (where a top ring, a second ring and an oil ring are set on a piston) with the top ring having a standard joint and with the second ring.
Authors
Citation
Nakashima, K., lshihara, S., Urano, K., and Murata, K., "A Study on Lubricating Oil Flow into the Combustion Chamber for the Top Ring with a Special Joint," SAE Technical Paper 982441, 1998, https://doi.org/10.4271/982441.Also In
References
- Nakashima, K. Ishihara, S. Urano, K. Observation of Lubricating Oil Flow from the Sump to the Combustion Chamber through the Piston Ring Belt in an Automobile Gasoline Engine Transactions of the Japan Society of Mechanical Engineers 60 578 1994 3583
- Nakashima, K. Ishihara, S. Urano, K. Experimental Development of Piston with Reduced Lubricating Oil Flow in Automobile Gasoline Engine Transactions of the Japan Society of Mechanical Engineers 61 587 1995 2738
- Nakashima, K. Ishihara, S. Urano, K. Influence of Piston Ring Gaps on Lubricating Oil Flow into the Combustion Chamber SAE Paper 952546
- Nakashima, K. Ishihara, S. Urano, K. Murata, K. Lubricating Oil Flow into the Combustion Chamber and its Reduction Method in an Automobile Gasoline Engine SAE Paper 962034
- Yoshida, H. Sugihara, H. Kusama, K. Practical Use of Two Piston Ring Set for Gasoline Engine SAE Paper 9508 17