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research-article

Design and experimental validation of a novel type of large-displacement constant-force mechanism

[+] Author and Article Information
Ming Li

School of Aeronautic Science and Engineering, Beihang University, Xueyuan Road 37, Haidian District, Beijing, P R China
li_ming@buaa.edu.cn

Wei Cheng

School of Aeronautic Science and Engineering, Beihang University, Xueyuan Road 37, Haidian District, Beijing, P R China
cheng_wei@buaa.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4040437 History: Received December 08, 2017; Revised May 17, 2018

Abstract

This paper presents the design and experimental validation of a novel type of passive large-displacement constant-force mechanism (CFM). Unlike previous studies, without using extra stiffness-compensation components and active control devices, the CFMs designed in this paper utilize the interaction between the components of cam and sliders to directly achieve the constant-force characteristic over the entire flexible-designed large displacement once the cam is advisably designed with profile curve identification method (PCIM). Corresponding to the different requirements of conventional and extreme engineering environments, the basic and ultra large-displacement CFM models are proposed respectively. The basic model is directly based on the PCIM while the ultra-large-displacement model is proposed using the relay-action of the multi-stage sliders. Friction factor is considered in the design theory to improve the accuracy and engineering applicability of the CFMs. According to the theoretical design models, we design and fabricate two corresponding CFM prototypes. Validation experiments are then conducted and the results show that both of the prototypes can satisfy the design requirements and possess the large-displacement constant-force characteristics due to the consistency of experimental and design data. Therefore, the effectiveness of the design theory for large-displacement CFM design is validated and the designed CFMs will have extensive applications in the relevant fields for force regulation and overload protection.

Copyright (c) 2018 by ASME
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