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Proceedings Paper

The study on leakage reappearance test of high pressure hose for power steering system
Author(s): Gi-Chun Lee; Hyoung-Eui Kim; Jong-Won Park; Won-Wook Jeong; Jong-Hwang Lee; Young-Han Lim; Kwon-Tae Hwang; Young-Shin Lee; Jae-Hoon Kim
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Paper Abstract

Generally, a leakage in a high pressure hose assembly can be determined if hydraulic fluid falls down through fitting which is swaged with a rubber hose. This study tried to visualize leakage, which is considered a failure occurring often in the hydraulic system. In the case of methods which verify leakage paths in the power steering hydraulic system equipped with a high pressure hose assembly, three types of leakage paths, which could be seen by cutting the swaging part, were generally found. However, it was difficult to find out leakage paths by using power steering oil. In this study, four methods, including the thermal burn image method, the hole drilling method of fitting metal, the white paint infiltration method, and the fluorescent infiltration method, were tried to introduce. The thermal burn image method failed to find out the leakage path between the fitting part and the rubber part. The hole drilling method is the way to check a leakage path on the fitting part, which doesn't need to cut a hose assembly. This method succeeds to visualize the leakage path partially but it could not check a sequential path of leakage, either, because it needs to drill more closely. The white paint infiltration method also could find the leakage path partially by using white paint mixed with thinner, which was pressurized by hand pump, instead of power steering oil. This method could check the leakage path by cutting the swaging part. The fluorescent infiltration method could verify the leakage path with naked eyes simply by holding the cutting swaging part closely to the ray of light. Reappearance test methods in the high pressure hose assembly, which include a hole drilling, a white paint infiltration, and a fluorescent infiltration method, can be applied to find the failure mode and to approve the test before the mass production of the high pressure hose.

Paper Details

Date Published: 20 October 2009
PDF: 8 pages
Proc. SPIE 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering, 74933H (20 October 2009); doi: 10.1117/12.843523
Show Author Affiliations
Gi-Chun Lee, Korea Institute of Machinery and Materials (Korea, Republic of)
Hyoung-Eui Kim, Korea Institute of Machinery and Materials (Korea, Republic of)
Jong-Won Park, Korea Institute of Machinery and Materials (Korea, Republic of)
Won-Wook Jeong, Hyundai and Kia Corporate Research and Development Div. (Korea, Republic of)
Jong-Hwang Lee, Hyundai and Kia Corporate Research and Development Div. (Korea, Republic of)
Young-Han Lim, Hwaseung R&A Co., Ltd. (Korea, Republic of)
Kwon-Tae Hwang, Chungnam National Univ. (Korea, Republic of)
Young-Shin Lee, Chungnam National Univ. (Korea, Republic of)
Jae-Hoon Kim, Chungnam National Univ. (Korea, Republic of)


Published in SPIE Proceedings Vol. 7493:
Second International Conference on Smart Materials and Nanotechnology in Engineering
Jinsong Leng; Anand K. Asundi; Wolfgang Ecke, Editor(s)

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