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Reduction of Piston System Friction by Applying a Bore Circularity Machining Technique to the Cylinder Block
Technical Paper
2005-01-1656
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The bores of the cylinder block are usually machined prior to assembly with the cylinder head. In this case, bore distortion occurs when the cylinder block is assembled with the cylinder head due to the load applied by the head bolts and the surface pressure of the head gasket. This bore distortion influences sealing and operating characteristics of the pistons and piston rings, requiring an increase in bore thickness and addition of ribs to obtain higher cylinder block rigidity, which lead to an increase in weight.
In order to improve engine performance, it is necessary to control bore distortion more effectively. With the aim of reducing bore distortion when assembled with the cylinder head, the bores are machined with a dummy cylinder head installed on the block to provide an equivalent head bolt load and gasket surface pressure. By using this bore circulatory machining technology, bore distortion after cylinder head assembly can be reliably suppressed.
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Authors
- Kazunori Matsuo - NISSAN MOTOR CO., LTD.
- Shinichi Kiga - NISSAN MOTOR CO., LTD.
- Satoshi Murata - NISSAN MOTOR CO., LTD.
- Naoyuki Satou - NISSAN MOTOR CO., LTD.
- Hidenori Miyake - NISSAN MOTOR CO., LTD.
- Kiyohisa Suzuki - NISSAN MOTOR CO., LTD.
- Kiyokazu Sugiyama - NISSAN MOTOR CO., LTD.
- Takayuki Monchujo - NISSAN MOTOR CO., LTD.
Topic
Citation
Matsuo, K., Kiga, S., Murata, S., Satou, N. et al., "Reduction of Piston System Friction by Applying a Bore Circularity Machining Technique to the Cylinder Block," SAE Technical Paper 2005-01-1656, 2005, https://doi.org/10.4271/2005-01-1656.Also In
References
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