日系鐵道列車所使用之熱軸箱感測器為溫度保險絲感測功能，是一種接觸式的溫度感測器，主要用於偵測列車軸箱內部的軸承是否因運轉異常而出現高溫現象，藉以傳遞告警訊號至駕駛室之車載監控螢幕，供駕駛員做出立即性處置。因此，熱軸箱感測器是否能精確地反饋軸箱溫度為主要關鍵。
本文分析日本500系鐵道列車現行使用之熱軸箱感測器材料為壓鑄式鋁合金ADC12材質，其熱傳導率佳，且具有良好之機械特性，雖符合熱軸箱感測器之運用，但為使感測器能更準確的反應軸承溫度，並有效地降低軸承過熱損壞之發生機率，本研究採用萃智理論運用創新思維模式，針對「熱傳導率改善」進行工程參數分析，尋求創新發明原則之特定解後，進行熱軸箱感測器功能創新研究。
經萃智理論研究結果顯示改變熱軸箱感測器鋁質外殼之材料屬性，可優化其熱傳導率。進行材料分析後，發現鋁合金A356其熱傳導率優於ADC12，故設定鋁合金A356外殼為研究目標。在透過風洞實驗與CAE模擬分析後，驗證其創新研究結果，確定鋁合金A356可取代ADC12運用於熱軸箱感測器之鋁質外殼。

This paper gives an overview on thermal conductivity improvement methods that applied to railway axle-box detector. It may cause a derailment accident, if breakdown of rolling stock axle-boxes could not be detected in due time. At present, a lot of advanced measurement and devices, which recognize Hot Axle Box failure when the train is in operation, have been implemented. The most often used measure of recognize Hot Axle-Box is a contact type of thermal fuse and is called Hot Axle-Box Detector in Japan 500 Series Shinkansen.

The Al-Si-Cu alloy ADC12 is a cast aluminum alloy widely used in frame case of Hot Axle-Box Detector in Japan, due to its excellent material properties and good thermal conductivity. However, in order to improve heat transfer coefficient accurately, the study implements the TRIZ method, an innovative design method developed by Ashuller.

According to the result by TRIZ analysis, the material properties of frame case of Hot Axle-Box detector should be changed. Therefore, the research target sets as changing the material from ADC12 to A356 aluminum alloy after material analysis. Finally, it is confirmed that thermal conductivity of A356 aluminum alloy is better than ADC12, after conducting wind tunnel experiment and CAE simulation.

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