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Technology for Applying Solid Lubricant to the Piston Skirt of Internal Combustion Engine and Its Effects

Article of Honda R&D Technical Review Vol.14 No.1

Summary

A molybdenum disulfide piston coating technique was developed using the Wonder Process Craft (WPC) processing method to apply high-purity molybdenum disulfide onto the sliding surface of the piston skirt for an internal combustion engine. This technique is a world first, and the pistons manufactured using this process gained the full effect of durability while also achieving significant reduction in sliding resistance at a low cost because the coating process does not require use of a binder. The technique is also noteworthy for making manufacturing easier, since it does not alter the dimensions, shape, or surface roughness of the base material. In addition, this piston manufacturing process uses compressed air and molybdenum disulfide powder. The molybdenum disulfide discharged from the process can also be recycled. Thus the process realizes zero waste and addresses the current need for environmentally friendlier technology.

Reference

(1) Ogihara, H.: “Technology to Reduce Engine Sliding Resistance Through Surface Improvement,” Research Conference on Fine-Grain Impact Surface Treatments, “The latest surface improvement technology — Application of technology for surface improvement by fine particle bombarding”, 2nd Technical Lecture, prepress edition, pp. 15–25, August 1999.
(2) Egami, N., Kagaya, T., et al: “Analysis of Particle Speed & Material Surface Temperature Distribution in Fine-Grain Peening,” Research Conference on Fine-Grain Impact Surface Treatments, “The latest surface improvement technology — Application of technology for surface improvement by fine particle bombarding”, 4th Technical Lecture, pre-press edition, pp. 18–24, October 2001.
(3) Takahashi, N., Kashiwaya, S.: High Resolution Transmission Wear 206, 8-14,1997
(4) Kashiwaya, S.: Junkatsu Keizai No. 385, 5-9, 1988.

Author (organization or company)

Hidemi OGIHARA(Tochigi R&D Center)

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