Abstract
A five-bar spatial mechanism named as a rotary clap mechanism is developed as a pumping device for positive displacement rotary pumps. The mechanism comprises a driving crank, a shaft link with two pins and two gears mounted on the middle and both ends, two rotors with jaws equally spaced along their circumferences, and two fixed internal gears. As the crank rotates, the gear pin-jointed to the crank rotates about the crank pin and at the same time rotates about the center of the fixed internal gears like a hypo-cyclic gear train. The gear-attached shaft link also rotates about the crank pin and about the fixed internal gears at the same time. This motion of the shaft link makes the pins rotate about the center of the fixed internal gears with a periodically varying radius. Therefore, two rotors driven by the pins rotate with different angular velocities. One rotor alternately leads and lags relative to the other rotor. These lead-lag motions between the two jaws of the rotors, which result in suction and discharge required for pumping, resemble hand clapping from which the mechanism was named. Construction and design parameters of the rotary clap mechanism are introduced, and kinematic analysis of this mechanism is performed. The relationships among design parameters, inherent constraints, and effects of design parameters on the displacement of mechanism are also presented.
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Sung Bo Shim holds a B.S. and an M.S. degrees in Biosystems Engineering from Seoul National University, Korea. He is currently a doctoral candidate in Biosystems Engineering at Seoul National University. He is interested in off-road vehicles and durability tests of machine components.
Young Jun Park has been working in Korea Institute of Machinery & Materials (KIMM) in Daejeon, Korea since 2006. He is interested in the design and analysis of gearboxes and bearings for wind turbines and construction equipment. He received a B.S., an M.S., and a Ph.D. degrees in Agricultural Machinery Engineering from Seoul National University, Korea.
Jong Mun Kim is currently the CEO of ClapMC Co. at Deajeon, Korea. He is interested in rotary machines (e.g., engine, expander, pump, etc). He has Korean patents for rotary clap mechanism. He holds a B.S. degrees in Agricultural Engineering from Seoul National University.
Kyeong Uk Kim has been a professor of Biosystems and Biomaterial Science and Engineering at Seoul National University, specializing in farm power and machinery, soil-machine systems, and life test of machine components. He has co-authored several books, including one that focuses on the principle of agricultural machines. He holds a B.S. and an M.S. degrees in Agricultural Engineering from Seoul National University and a Ph.D. in Agricultural Engineering from the University of Illinois at Urbana-Champaign, USA (1981).
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Shim, S.B., Park, Y.J., Kim, J.M. et al. Development of a rotary clap mechanism for positive-displacement rotary pumps: Kinematic analysis and working principle. J Mech Sci Technol 29, 759–767 (2015). https://doi.org/10.1007/s12206-015-0137-7
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DOI: https://doi.org/10.1007/s12206-015-0137-7