하역기용 선회감속기 피니언의 강도설계
Abstract
The external pinwheel gear set (e-PGS) has a simpler structure, lower costs, and is easier to process and overhaul than general gears. It is also suitable for use under low-speed, heavy-duty mechanical transmission, dusty, and poor lubrication conditions. In this study, the fatigue failure life of a slewing drive pinion used in ship unloaders was investigated. We analyzed an e-PGS, considering the center distance modification coefficient (CDMC) for the exact pinion tooth profile. Next, Hertz contact stresses and tooth root bending stresses were analyzed by varying the CDMC to determine the tooth fatigue characteristics. The variation in the contact force with an increase in the CDMC was insignificant, but the Hertz contact and tooth root bending stresses decreased significantly. In addition, the e-PGS pinion design adopted in this study was focused on preventing tooth surface wear and pitting instead of tooth root breakage.
Keywords:
e-PGS (external pinwheel gear set), Ship unloader, Center distance modification coefficient, Hertz contact stress, Tooth root bending stressAcknowledgments
본 연구는 2020년도 중소벤처기업부의 기술개발사업 지원에 의한 연구임[S2847715].
References
- Shin, H. C., 2017, A Study on Pitting Life Estimation of Girth Gear based on e-PGS, A Thesis for a Master, Changwon National University, Republic of Korea.
- Litvin, F. L., Fuentes, A., 2004, Gear Geometry and Applied Theory, 2nd ed., Cambridge University Press, London.
- Veja, A. D., 2012, Contributions Concerning the Roller Gearing Tooth Profile Generation, Balkan Journal of Mechanical Transmissions, 2:1 73-77.
-
Honda, H., Makino, H., 1994, Research on the Trochoidal Gears (1st Report), Journal of the Japan Society for Precision Engineering, 60:7 949-953.
[https://doi.org/10.2493/jjspe.60.949]
-
Honda, H., 1995, Research on the Trochoidal Gears (2nd Report), Journal of the Japan Society for Precision Engineering, 61:2 208-212.
[https://doi.org/10.2493/jjspe.61.208]
- Nam, H. C., 2013, A Study on Tooth Profile Design for Rotary Motion Gear System based on Roller Gear Mechanism, A Thesis for a Doctorate, Changwon National University, Republic of Korea.
-
Kwon, S.-M., 2015, Contact Stress of Slewing Bearing with External Pinwheel Gear Set, Journal of the Korean Society of Manufacturing Technology Engineers, 24:2 231-237.
[https://doi.org/10.7735/ksmte.2015.24.2.231]
-
Kwon, S.-M., Shin, H.C., 2016, Estimation of Contact Fatigue Life of a Girth Gear Based on Pinwheel, Journal of the Korean Society of Manufacturing Technology Engineers, 25:4 245-252.
[https://doi.org/10.7735/ksmte.2016.25.4.245]
-
Kwon, S.-M., 2018, Contact Fatigue Life of Yaw Drive Pinion using e-PGS, Transactions of the Korean Society of Mechanical Engineers - A, 42:6 557-563.
[https://doi.org/10.3795/KSME-A.2018.42.6.557]
- Budynas, R. G., Nisbett, J. K., 2015, Shigley’s Mechanical Engineering Design, 10th ed., McGraw-Hill, New York.
- Guideline DG03, 2009, Wind Turbine Design, Yaw & Pitch Rolling Bearing Life, NREL, Colorado, USA.
Full Professor in the School of Mechanical Engineering, Changwon National University.His research interests are pin gearing and speed reducer.
E-mail: smkwon@changwon.ac.kr
Graduate Student in the Department of Mechanical Design and Manufacturing Engineering, Changwon National University.Her research interest is pin gear drive unit.
E-mail: yun9855@naver.com