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research-article

Cam Profile Generation for Cam-Spring Mechanism with Desired Torque

[+] Author and Article Information
Fei Gao

ASME Student Member, Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Shatin, 999077, NT, Hong Kong
fgao2@mae.cuhk.edu.hk

Yannan Liu

Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Shatin, 999077, NT, Hong Kong
lyn2014hk@gmail.com

Wei-Hsin Liao

ASME Fellow, Professor, Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Shatin, 999077, NT, Hong Kong
whliao@cuhk.edu.hk

1Corresponding author.

ASME doi:10.1115/1.4040270 History: Received August 23, 2017; Revised April 18, 2018

Abstract

Commercial springs have linear characteristics. Nevertheless, in some cases, nonlinear behavior (e.g., nonlinear torque) is desired. To obtain desired nonlinear torque characteristics, the cam-spring mechanism with a specified cam profile is proposed. In this study, cam profile generation for the cam-spring mechanism with a specific torque behavior is investigated. First, the model of cam-spring mechanism considering the friction force is analyzed. Based on this model, the expression of spring torque is derived. When the friction coefficient is zero, the analytical solution of the equation (spring deformation) is derived. However, in practice, where the friction coefficient is not zero, an analytical solution is not available. Therefore, a numerical solution is sought. Finally, from the obtained spring deformation, the cam profile and pitch curve are generated. Results of an experiment conducted to verify the new method show that the cam profile generated by the method can precisely mimic the desired torque behavior. In addition, the hysteresis induced by the friction force in the cam-spring mechanism is also studied. By increasing spring stiffness, spring free length, and cam eccentricity, the hysteresis in the cam-spring mechanism can be decreased.

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