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International Journal of Rotating Machinery
Volume 2013 (2013), Article ID 438127, 5 pages
Research Article

Effect of Mechanism Error on Input Torque of Scroll Compressor

College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, China

Received 29 July 2013; Accepted 13 October 2013

Academic Editor: Ryoichi Samuel Amano

Copyright © 2013 Man Zhao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Based on the fundamental principle of plane four-bar mechanism, the force on the equivalent parallel four-bar mechanism was analyzed for scroll compressor with mini-crank antirotation, and the formula of input torque was proposed. The change of input torque caused by the mechanism size error was analyzed and verified with an example. The calculation results show that the mechanism size error will cause large fluctuation in input torque at the drive rod and connecting rod collinear and the fluctuation extreme value increases with rotational speed. Decreasing of the crankshaft eccentricity errors is helpful for reducing the effects of dimension error on input torque but will increase the friction loss of orbiting and fixed scroll wrap. The influence of size error should be considered in design in order to select suitable machining accuracy and reduce the adverse effect caused by size error.