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〈학술논문〉하이포 트로코이드 기어펌프의 접촉응력과 건마멸 특성에 관한 연구
권순만(Soon-Man Kwon),심무용(Muyong Sim),여뢰(Lei Lu),신중호(Joong-Ho Shin) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The contact stress in a hypotrochoidal pump is addressed in this paper because it cannot be adjusted for wear. The first part of this paper presents a simple and exact rotor profile equations of the hypotrochoidal pump. In the second part of this paper, an explicit formular to avoid undercut in the outer-rotor of the hypotrochoidal pump is proposed by examining the minimum radius of curvature of the inner-rotor tooth profile on the convex section. Next, the contact stresses without hydrodynamic effect between the inner and outer-rotors are evaluated through the calculation of the Hertzian contact stress between the rotors' teeth. Based on the above results, we finally present the wear characteristics of p<SUB>H</SUB>V<SUB>s</SUB>. factor, which is proportional to the wear rate, between the rotors of the hypotrochoidal pump under quasi-static and dry contact conditions.
권순만(Soon-Man Kwon),심무용(Muyong Sim),남형철(Hyoungchul Nam),신중호(Joong-Ho Shin) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.12
A disadvantage in the design of a hypotrochoidal gear pump as in a gerotor pump is a lack of parts that can be adjusted to compensate for wear in the rotor set, and as a consequence, it causes a sharp reduction of volumetric efficiency. In this paper, an attempt has been made to reduce the wear rate between the rotors of a hypotrochoidal gear pump. Using the knowledge of shape design on the rotors, the contact stresses without hydrodynamic effect between the rotors' teeth are evaluated through the calculation of the Hertzian contact stress. Based on the above result and the sliding velocity between the rotors, a genetic algorithm (GA) is used as an optimization technique for minimizing the wear rate proportional factor (WRPF). The result shows that the wear rate or the WRPF can be reduced considerably, e.g. approximately 12.8% in this paper, throughout the optimization using GA.