Mechanical design and energy storage efficiency research of a variable stiffness elastic actuator

Liu, Bo; Ge, Wenjie; Zhao, Donglai; Zou, Ziyu; Li, Bowei

doi:10.1177/1729881420930950

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…Therefore, the flexible joint based on a variable stiffness actuator is considered an important strategy, becoming the focus of the relevant research. The variable stiffness actuators include linear [7][8][9] and rotational [10,11]. Linear actuators are usually applied for the knee joint, legged robotics, and finger joints.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Design and Experiments of a New Rotational Variable Stiffness Actuator for Hybrid Passive–Active Stiffness Regulation

Wang,

Gao,

Wang

et al. 2023

Actuators

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To improve collision safety in robot–human collaborative applications, increasing attention has been paid to rotational variable stiffness actuators. A new rotational variable stiffness actuator, which works in two stages, is proposed for hybrid passive–active stiffness regulation. The passive stage is based on the motions of springs driven by the rack-and-pinion systems, elastically converting the shaft’s rotation into the inner shell rotation fixed to the internal gear of the active stage. The active stage is designed to achieve the movement of the pivot point located on the roller actuated by the adjustment motor, providing the output angle of the output shaft. The two pairs of rack-and-pinion systems of the passive stage and the two pairs of planetary gears of the active stage are designed for side-by-side placement, improving the stability and balance of the stiffness regulation process. Two symmetrical cam-slider mechanisms acting as leverage pivots ensure the synchronous movements of the two rollers. The variable stiffness actuator is designed and validated by simulations and experiments. Strength analysis and stiffness analysis are presented. The designed actuator can obtain the range of stiffness adjustment of 35–3286 N·mm/deg. The range of the angle difference between the input and output shafts is ±48°.

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