Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Design of Gerotor Using Cycloid and Circular-Arc Curves

사이클로이드 및 원호 곡선을 이용한 제로터 개발

  • Choi, Tae-Hoon (School of Mechanical Engineering, Pusan Nat'l Univ.) ;
  • Kim, Moon-Saeng (School of Mechanical Engineering, Pusan Nat'l Univ.) ;
  • Lee, Geun-Su (Research Institute, Samhan Co., Ltd) ;
  • Jung, Sung-Yuen (Research Institute of Mechanical Technology, Pusan Nat'l Univ.) ;
  • Kim, Chul (Research Institute of Mechanical Technology, Pusan Nat'l Univ.)
  • 최태훈 (부산대학교 기계공학부) ;
  • 김문생 (부산대학교 기계공학부) ;
  • 이근수 ((주)삼한 연구소) ;
  • 정성윤 (부산대학교 기계기술연구원) ;
  • 김철 (부산대학교 기계기술연구원)
  • Received : 2010.08.17
  • Accepted : 2010.12.24
  • Published : 2011.03.01
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Abstract

The new gerotor developed in this paper has an inner rotor in which a circular arc is inserted between the hypocycloid and epicycloid curves, whereas the outer rotor is designed using the simulation results for the rotor and a modification method. The new gerotor has no cusps and loops and no limit on the eccentricity. We increase the average flow rate by adding a new design parameter, $\gamma$, which is the inclined angle of the inner rotor at the intersection of the hypocycloid and the circular arc. A calculation method to calculate the chamber area is also developed. This method can also be used to calculate the flow rate and flow rate irregularity when the contact points are unknown. The control of eccentricity and $\gamma$ is expected to lead to an efficient rotor.

본 논문에서는 하이포 및 에피 사이클로이드 곡선 사이에 원호 곡선을 삽입하여 내부로터를 설계하고 로터 회전시뮬레이션 및 간섭회피를 위한 수정법을 통해 외부로터를 설계하는 방식의 제로터를 개발하였다. 또한 접촉점을 이용한 기존의 유량계산법을 사용할 수 없는 경우에 유량 및 유량맥동을 도출할 수 있는 챔버면적 계산법을 개발하였다. 이와 같은 방식의 제로터는 로터 설계시 첨점 및 루프가 발생하지 않으며, 내부로터의 하이포 사이클로이드 및 원호 곡선 연결점에서 새로운 설계변수인 경사각 $\gamma$가 추가되어 편심량 설정시 첨점 및 루프 발생 방지조건 또는 이끝폭의 설계 한계조건으로부터 제한을 받지 않는다. 따라서 설계자는 편심량 및 각도 $\gamma$를 조절함으로써 실제 산업현장에서 보다 효과적으로 로터 최적설계를 수행할 수 있다.

Keywords

References

  1. Sasaki, H., Inui, N., Shimada, Y. and Ogata, D., 2008,"Development of High Efficiency P/M Internal Gear Pump Rotor(Megafloid Rotor)," Automotive SEI Technical Review, No. 66, pp. 124-128.
  2. Colbourne, J. R., 1975, "Gear Shape and Theoretical Flow Rate in Internal Gear Pumps," Trans. of the CSME, Vol. 3, No. 4, pp. 215-223.
  3. Saegusa, Y., Urashima, K., Sugimoto, M., Onoda, M. and Koiso, T., 1984, "Development of Oil-Pump Rotors with a Trochoidal Tooth Shape," SAE paper, No. 840454.
  4. Beard, J. E., Hall, A. S. and Soedel, W., 1991, "Comparison of Hypotrochoidal and Epitrochoidal Gerotors," ASME Journal of Mechanical Design, Vol. 113, pp. 133-141. https://doi.org/10.1115/1.2912761
  5. Fabiani, M., Manco, S. Nervegna, N. and Rundo, M., 1999, "Modelling and Simulation of Gerotor Gearing in Lubricating Oil Pumps," SAE, No. 1999-01-0626.
  6. Mimmi, G. C. and Pennacchi, P. E., 2000, "Non-Undercutting Conditions in Internal Gears," Mech. Mach. Theory, Vol. 35, No. 4, pp. 477-490. https://doi.org/10.1016/S0094-114X(99)00028-2
  7. Demenego, A., Vecchiato, D., Litvin, F. L., Nervegna, N. and Manco, S., 2002, "Design and Simulation of Meshing of a Cycloidal Pump," Mech. Mach. Theory, Vol. 37, No. 3, pp. 311-332. https://doi.org/10.1016/S0094-114X(01)00074-X
  8. Lee, S. C., 2006, "Profile Design of the Inner Rotor of a Gerotor by the Composite Curve of Circular Arcs," Journal of the KSTLE, Vol. 22, No. 2, pp. 79-86.
  9. Chang, Y. J., Kim, J. H., Jeon, C. H., Kim, C. andJung, S. Y., 2007, "Development of an Integrated System for the Automated Design of a Gerotor Oil Pump," ASME Journal of Mechanical Design, Vol. 129, No. 10, pp. 1099-1105. https://doi.org/10.1115/1.2757629
  10. Hsieh, C. F. and Hwang, J. H., 2007, "Geometric Design for a Gerotor Pump with High Area Efficiency," ASME Journal of Mechanical Design, Vol. 129, No. 12, pp. 1269-1277. https://doi.org/10.1115/1.2779887
  11. Jung, S. Y., Kim, M. S., Cho, H. Y. and Kim, C., 2009, "Development of an Automated Design System for Oil Pumps with Multiple Profiles(Circle, Ellipse and Involute)," Journal of KSPE, Vol. 26, No. 3, pp. 103-112.
  12. Ye, Z., Zhang, W., Huang, Q. and Chen, C., 2006,"Simple Explicit Formulae for Calculating Limit Dimensions to Avoid Undercutting in the Rotor of a Cycloid Rotor Pump," Mech. Mach. Theory, Vol. 41, No. 4, pp. 405-414. https://doi.org/10.1016/j.mechmachtheory.2005.07.001
  13. Sumimoto Electric Sintered Allowy, LTD., 2006, "Internal Gear Pump and Inner Rotor of the Pump," KRpatent, 10-2006-0032634.

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