연료레일의 응력 저감을 위한 최적 설계
Optimal Design of Fuel Rail for Stress Reduction
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초록
This paper is one of basic studies for development of fuel rail to secure strength of GDI system. The fuel rail supports high pressure of 200~250bar and stores fuel while reducing pulsation during injection. Therefore, the structural characteristics of the conventional fuel rail was investigated with respect to stress and displacement. Then, the study focused on reducing stress concentration on fuel rail design to enhance the strength of each components. It was found that the maximum stress was not affected to the dimensions of taper lengths and angles of holes for fuel pipe. Also, it was found that the shape of holes for fuel pipe was key factor to reduce maximum stress, and the bridge between injector and mounting holder was effective structure to reduce the stress of injectors and displacement of the fuel rail system.
Abstract
This paper is one of basic studies for development of fuel rail to secure strength of GDI system. The fuel rail supports high pressure of 200~250bar and stores fuel while reducing pulsation during injection. Therefore, the structural characteristics of the conventional fuel rail was investigated with respect to stress and displacement. Then, the study focused on reducing stress concentration on fuel rail design to enhance the strength of each components. It was found that the maximum stress was not affected to the dimensions of taper lengths and angles of holes for fuel pipe. Also, it was found that the shape of holes for fuel pipe was key factor to reduce maximum stress, and the bridge between injector and mounting holder was effective structure to reduce the stress of injectors and displacement of the fuel rail system.
참고문헌 (8)
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- 이근종, "GDI 엔진의 인젝터 이상이 점화코일 2차 파형과 배출가스에 미치는 영향", 한국기계기술학회지, 19(5), pp.585~591 (2017), 한국기계기술학회[DOI]
- S. Y. Ahn, "An Analytical Study on Development of GDI Rail to Meet Next Generation GDI Fuel Pressure", Proc. of The Korean Soc. for Noise and Vibration Eng, pp.975~975 (2016)
- H. J. Park, "A Study on the Pulsation According to Fuel Rail Shape Using Numerical Analysis", Proc. of The Korean Soc. of Automotive Engineers, pp.35~35 (2018)
- S. C. Lee, "Optimization of intake manifold port injection fuel rail for reduction of pressure pulsation in fuel rail", Proc. of The Korean Soc. of Automotive Engineer, pp.44~51 (2014)
- J. Y. Shim, "Fluid-Structure Interaction Analysis for Pulsation Damping in Fuel Rail", Proc. of The Korean Soc. for Noise and Vibration Eng, pp.700~703 (2006)
- 송세암, "커먼레일 시스템 연료분사관의 피로수명 개선에 관한 연구", 대한기계학회논문집 A, 37(8), pp.991~998 (2013), 대한기계학회
- S. Y. Ahn, "FEM based Analytical Study for Securing the Stiffness of GDI Rail with Increased Fuel Injection Pressure of Vehicle with GDI System", Proc. of The Korean Soc. of Automotive Engineers, pp.53~53 (2017)