Fabrication and Output Characteristics of a Belt-Driven Type Heat-Engine Using Shape Memory Alloy Spiral Spring Actuators

• Morita T.

  Graduate student of Environmental Engineering, The University of Kitakyushu

• Nishimura Y.

  Graduate student of Environmental Engineering, The University of Kitakyushu

• Fujiki H.

  College student of Environmental Engineering, The University of Kitakyushu

• Kishimoto S.

  College student of Environmental Engineering, The University of Kitakyushu

• Takeda Y.

  Take R&D

• Cho H.

  Faculty of Environmental Engineering, The University of Kitakyushu

抄録

Shape memory alloys (SMAs) have been employed to apply to heat-engines using low temperature thermal energy (such as hot exhaust heat and hot spring water). However, since previous SMA heat-engines use wire- or coil-shape SMA elements, it is necessary to increase the applied strain of SMA elements for increasing engine power. Furthermore, a certain part of the SMA element is locally heated and cooled repeatedly in the mechanism adapted by previous engines, which leads to inhomogeneous temperature variation and deformation of the SMA element which causes the overload at that part of the SMA element. Accordingly, the product life of SMA heat engines decreases as engine power increases. Hence SMA heat-engines have not been put into practical use. Then, we produced the heat engine using spiral spring actuators joined by multistage gear (the gear-driven type) to improve product life. However, the output efficiency of this SMA heat-engine is 50 % lower than that of conventional SMA heat-engines. The decrease of efficiency is due to the mechanical loss of multistage gear. Therefore, we produced a new heat-engine using spiral spring actuator joined by a pulley belt (the belt-driven type), and investigate output characteristics of the engine. In consequence, the output efficiency of the new engine is 20 % higher than that of the gear-driven type heat-engine using a spiral spring actuator.

収録刊行物

• Transactions of the Materials Research Society of Japan

  Transactions of the Materials Research Society of Japan 40 (3), 301-304, 2015

  一般社団法人 日本MRS

キーワード

• shape memory alloy
• spiral spring actuator
• gear-driven type
• belt-driven type
• heat-engine

詳細情報

• CRID: 1390001205511832448
• NII論文ID: 130005096518
• DOI: 10.14723/tmrsj.40.301
• ISSN: 21881650
• ISSN: 13823469
• Web Site: https://www.jstage.jst.go.jp/article/tmrsj/40/3/40_301/_pdf
• 本文言語コード: en
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