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On the Finding of Collinearity Circles for Force-Input Coupler-Driven Four-Bars

[+] Author Affiliations
Yin-ping Chang

Oakland University, Rochester, MI

Innchyn Her

National Sun Yat-Sen University, Kaohsiung, Taiwan

Paper No. DETC2012-70458, pp. 477-483; 7 pages
doi:10.1115/DETC2012-70458
From:
  • ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 4: 36th Mechanisms and Robotics Conference, Parts A and B
  • Chicago, Illinois, USA, August 12–15, 2012
  • Conference Sponsors: Design Engineering Division, Computers and Information in Engineering Division
  • ISBN: 978-0-7918-4503-5
  • Copyright © 2012 by ASME

abstract

While there have been ample amount of publication on traditional four-bar transmission characteristics, little is found in the field relating to the transmission of a singular type of four-bar, namely, the force-input, coupler-driven variety. In contrast to the conventional torque-input, crank-driven four-bars, the use of this new category of linkage is only gradually surfacing. In this paper, a novel performance indicator called the Collinearity Circle is proposed, which is used to monitor the effectiveness of the transmission in a force-input, coupler-driven four-bar. The salient feature of this Collinearity Circle lies not only in its convenient shape, but also in its simple derivation, which can be shown to be merely geometry-dependent. Like the well known instant center, which is also only geometry-dependent, the proposed Collinearity Circle will be proved to be a handy addition to the kinematics toolbox for its power to enable speedy construction and ballpark estimations on the transmission properties of force-input, coupler-driven mechanisms.

Copyright © 2012 by ASME

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