RESEARCH PAPERS: Mechanisms Papers

Design of Drag-Link Mechanisms With Minimax Transmission Angle Deviation

[+] Author and Article Information
L.-W. Tsai

Mechanical Research Department, General Motors Research Laboratories, Warren, Mich. 48090

J. Mech., Trans., and Automation 105(4), 686-690 (Dec 01, 1983) (5 pages) doi:10.1115/1.3258535 History: Received December 27, 1983; Online November 19, 2009


In this paper, the design equations are derived for the synthesis of a drag-link mechanism, with given output-link rotation and the corresponding input-link rotation. The design criterion used is based on the maximum capability of a drag-link mechanism to provide a given delay or advance in the output motion. The solutions are given as a single-valued parametric set of equations for the link lengths. The transmission-angle optimization is accomplished by the minimization of the maximum transmission-angle deviation from 90 deg. It is shown that the optimum design can be obtained by solving a cubic equation in a single parameter. Design charts for the optimum design of a drag-link mechanism were developed. It is also shown that there is a one-to-one correspondence between the design of a crank-and-rocker mechanism and the drag-link mechanism.

Copyright © 1983 by ASME
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