Advanced SearchSearch Tips
Stress Analysis of Epitrochoidal Gerotor for Hydraulic Motor
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Stress Analysis of Epitrochoidal Gerotor for Hydraulic Motor
Kim, Du-In; Choe, Dong-Hun; An, Hyo-Seok;
  PDF(new window)
Gerotor is a planar mechanism consisting of a rotor and lobes which form a closed space, namely a chamber. As active contact points between a rotor and lobes are subjected to very high contact stresses, wear in one or both of the rotor and lobe cannot be avoided. Therefore, in the design of Gerotor used in hydraulic motors a compromise between high torque output and contact stress is of great importance and a thorough analysis of design parameters should be conducted to achieve this compromise. In this study, a contact point is modelled as a linear spring in consideration of equivalent curvature to analyze the contact stress. As the contact stress calculation in this problem is a statically indeterminate type, a numerical iterative scheme has been adopted to obtain the solution. To fully understand the influence of design parameters on the contact stress, the relationship between pressure force, equivalent curvature, contact force and contact stress are analyzed. It is shown that the equivalent curvature of the contact point is a dominant factor that affects the maximum contact stress.
Gerotor;Hydraulic Motor;Mean Torque;Equivalent Curvature;Contact Stress;
 Cited by
Design of Port Plate in Gerotor Pump for Reduction of Pressure Pulsation,;;;

Journal of Mechanical Science and Technology, 2006. vol.20. 10, pp.1626-1637
김대은, 김영진, 1997, '구름계의 구름저항 및 표면파손현상의 실험적 고찰,' 대한기계학회 논문집, pp. 2019-2028

Colbourne, J. R., 1974, 'The Geometry of Trochoid Envelope and Their Application in Rotary Pumps,' Mechanisms and Machine Theory, Vol. 9, pp. 421-435 crossref(new window)

Saegusa, Y., Urashima, K., Sugimoto, M., Onoda, M. and Koiso, T., 'Development of Oil Pump Rotors with a Trochoidal Tooth Shape,' SAE paper No.8404542

Tsay, C. B., Yu, C. Y., 1989, 'Mathematical Model for the Profile of Gerotor Pumps,' J. of CSME, Vol. 10, No. 1, pp. 41-47

Beard, J. E., 1992, 'The Effects of The Generating Pin Size and Placement on the Curvature and Displacement of epitrochoidal Gerotors,' Mech. Mach. Theory, Vol. 27, No. 4, pp. 373-389 crossref(new window)

이성철, 이성남, 1995, '유압 모터에 사용되는 제로터의 설계 및 해석,' 한국윤활학회지, 제11권, 제2호, pp. 63-70

Mimmi, G. C., Pennacchi, P. E., 1997, 'Involute Gear Pumps Versus Lobe Pumps: A Comparison,' ASME J. of Mechanical Design, Vol. 119, pp. 458-465

Johnson, K. L., 1985, Contact mechanics, Cambridge University Press

Dudley, D. W., 1984, Handbook of Practical Gear Design, p. 2.19, McGraw-Hill