Technical Brief

Synthesizing Constant Torque Compliant Mechanisms Using Precompressed Beams

[+] Author and Article Information
Ishit Gandhi

Department of Mechanical Engineering, Texas A&M University-Kingsville, Kingsville, TX 78363

Hong Zhou

Department of Mechanical Engineering, Texas A&M University-Kingsville, Kingsville, TX 78363

1Corresponding author.

ASME doi:10.1115/1.4041330 History: Received March 13, 2018; Revised August 15, 2018


A constant torque compliant mechanism generates an output torque that keeps invariant in a large range of input rotation. Because of the constant torque feature and the merits of compliant mechanisms, they are used in automobile, aerospace, medical, healthcare, timing, gardening and other devices. A common problem in the current constant torque compliant mechanisms is their preloading range that is a certain starting range of the input rotation. In the preloading range, the output torque of a constant torque compliant mechanism does not have the desired constant torque. It increases from zero to a value. The preloading range usually accounts for one third of the entire input rotation range, which severally weakens the performance of constant torque compliant mechanisms. In this paper, the preloading problem is eradicated by using precompressed beams as building blocks for constant torque compliant mechanisms. It is challenging to synthesize constant torque compliant mechanisms composed of precompressed beams because of the integrated force, torque and deflection characteristics. The synthesis of constant torque compliant mechanisms is systemized as parameter optimization of the composed precompressed beams. The presented synthesis method is demonstrated by synthesizing constant torque compliant mechanisms with different numbers of precompressed beams and validated by experimental results.

Copyright (c) 2018 by ASME
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