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	弾性流体潤滑	製造・組立配慮設計
分野	製造工学	製造工学
系統	Process / pipeline	Process / pipeline
提唱年	1977	1994
提唱者	Dowson, D., Higginson, G. R.	Boothroyd, G., Dewhurst, P.
種類	Mathematical model for lubricated contacts	Systematic approach to cost-effective product design
原典	Dowson, D., & Higginson, G. R. (1977). Elastohydrodynamic Lubrication: The Fundamentals of Roller and Gear Lubrication. Pergamon Press. ISBN: 0-08-021710-4	Boothroyd, G., Dewhurst, P., & Knight, W. A. (1994). Product Design for Manufacturing and Assembly (1st ed.). Marcel Dekker. ISBN: 0-8247-9157-6
別名	EHL, Elastohydrodynamic film, Hydrodynamic lubrication	DFMA, Design for manufacturability, DFA
関連	4	4
概要	Elastohydrodynamic lubrication (EHL) is the regime of fluid film lubrication in which elastic deformation of the surfaces plays a crucial role in maintaining a fluid layer between sliding or rolling surfaces. In applications like roller bearings and gears, the contact pressure is extremely high, causing the lubricant viscosity to increase dramatically and the surfaces to deform elastically. EHL theory, developed rigorously by Dowson and Higginson, predicts the film thickness, pressure distribution, and friction in these heavily loaded contacts.	Design for Manufacturing and Assembly (DFMA) is a systematic methodology for creating products that are inherently easier and less expensive to manufacture and assemble. Developed by Boothroyd, Dewhurst, and Knight, DFMA evaluates design choices based on their impact on production cost, quality, and speed, guiding designers toward solutions that balance performance, manufacturability, and economics.