Ti-Ni 超弾性合金ワイヤを用いて作製したゼンマイばねのトルク特性

執筆者: 徳永仁夫1)，二渡寿樹2)，渡辺創1)
所属: 1)鹿児島工業高等専門学校 2)東京大学大学院新領域創成科学研究科
Author: Hitoo TOKUNAGA1), Toshiki FUTAWATARI2), So WATANABE1)
Belonging: 1)National Institute of Technology，Kagoshima College 2)Department of Human and Engineered Environmental Studies, The University of Tokyo

抄録

本研究では、Ti-Ni 超弾性合金線材を使用したゼンマイばねの作製法を提案する。さらに、Ti-Ni 超弾性合金ゼンマイばねを作製し、そのトルク特性を調べる。具体的には、トルク特性として、巻締・巻戻し過程でのトルク変化を調べた。また、巻締・巻戻しの繰返しがトルク特性に及ぼす影響を調べた。結果として、Ti-Ni 超弾性合金ゼンマイばねは巻締・巻戻しの過程においてトルクが一定となる領域が存在することがわかった。さらに、巻締・巻戻しを繰返すことで、トルク特性を示す曲線は低トルク側に推移することがわかった。

Summary

The objective of this study is to develop a new spiral spring that exhibits unique deformation behavior.The properties of the spiral spring make it suitable for use not only as an energy storage element but also as an actuator or similar device. In the present study, a process for manufacturing a spiral spring made of Ti–Ni superelastic alloy wires was proposed. In addition, torque characteristics of the manufactured spiral spring were investigated by torque measurement tests. Rotational torque during wind and rewind processes at a constant rotational speed was monitored. In addition, torque measurement tests were repeated to investigate the effect of the number of wind and rewind processes on the torque characteristics. Two main results were obtained. First, the torque characteristics of the spiral spring show
torque plateau behaviors, which are expected to produce a constant energy output. Second, the torque characteristic depends on the number of torque measurement tests. Torque values decrease with increasing number of repeated tests. These results for the spiral spring correspond to the superelastic behavior of the Ti–Ni alloy.

Keyword

Superelastic alloy, Ti-Ni, Spiral spring, Torque characteristics, Energy storage, Actuator