Abstract
This paper presents a novel adjustable constant-force mechanism (ACFM) based on spring and gear transmission. The mechanism is constructed by combining two gear-spring units and a Sarrus linkage. The significance of this design is that it can provide a constant force, which can be adjustable, over a large displacement. The adjustment of the output force is energy-free through a change in the spring position without spring preload. This work first explains the geometric constraints and desired parameters of the ACFM. Then, a numerical example is provided to illustrate the performance of the mechanism. Moreover, this paper also shows a prototype and experiments with an ACFM. It was found that the ACFM could provide a constant force of up to 20 N within a range of 140 mm, and the force error is less than 6%.
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Nguyen, V.L. (2023). A Novel Adjustable Constant-Force Mechanism Based on Spring and Gear Transmission. In: Laribi, M.A., Nelson, C.A., Ceccarelli, M., Zeghloul, S. (eds) New Advances in Mechanisms, Transmissions and Applications. MeTrApp 2023. Mechanisms and Machine Science, vol 124. Springer, Cham. https://doi.org/10.1007/978-3-031-29815-8_37
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DOI: https://doi.org/10.1007/978-3-031-29815-8_37
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