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Journal of Engineering
Volume 2016 (2016), Article ID 1578342, 9 pages
Research Article

Analysis of the Single Toggle Jaw Crusher Force Transmission Characteristics

Department of Mechanical and Manufacturing Engineering, The University of Nairobi, P.O. Box 30197, Nairobi 00100, Kenya

Received 9 June 2016; Revised 6 November 2016; Accepted 14 November 2016

Academic Editor: Yuh-Shyan Hwang

Copyright © 2016 Moses Frank Oduori 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.


This paper sets out to perform a static force analysis of the single toggle jaw crusher mechanism and to obtain the force transmission characteristics of the mechanism. In order to obtain force transmission metrics that are characteristic of the structure of the mechanism, such influences as friction, dead weight, and inertia are considered to be extraneous and neglected. Equations are obtained by considering the balance of forces at the moving joints and appropriately relating these to the input torque and the output torque. A mechanical advantage, the corresponding transmitted torque, and the variations thereof, during the cycle of motion of the mechanism, are obtained. The mechanical advantage that characterizes the mechanism is calculated as the mean value over the active crushing stroke of the mechanism. The force transmission characteristics can be used as criteria for the comparison of different jaw crusher mechanism designs in order to select the most suitable design for a given application. The equations obtained can also be used in estimating the forces sustained by the components of the mechanism.