臺灣博碩士論文加值系統

在現今全球暖化的議題受到普遍重視，
提倡節能減碳的觀念已被大眾接受，
進而使得更多人選擇騎乘自行車來取代原本的排碳交通工具，
不但滿足環保的目的，也達到運動的效果。
市面上常見的自行車鏈輪皆是採用圓形鏈輪，
然而圓形鏈輪面臨著死點的問題，反之，
非圓形鏈輪有快速通過死點及降低肌肉使用率的優點達到省力的效果，
進而提升自行車騎乘效益，故探討及研究非圓形鏈輪具有潛在的市場價值。
由於人類左右腳的踩踏力量有所差異，且每個角度的踩踏力均不同，
為了獲得更佳的騎乘效率，
本研究提出特殊的非圓形鏈輪設計來改善左右腳施力不平均的問題。
然後針對非圓形鏈輪撰寫電腦輔助程式，
根據所需的參數條件及滿足節曲線可分割為鏈條節距的整數倍之弦長條件，
求得對應的非圓形鏈輪，
將數種不同設計考量的非圓形鏈輪及傳統圓形鏈輪進行實驗分析，
並且搭配數位影像以測量踏板角度之儀器，得到自行車騎乘時的踩踏力。
藉由踩踏力與自行車五連桿機構平衡方程式推算出各關節的受力情形，
進而分析不同鏈輪所帶來的優劣。本研究透過多位受測者的實驗，
藉由測量效率、扭力、轉速、及關節受力來找出本實驗設計中的最佳非圓形鏈輪。

In today's global warming issue, the concept of promoting energy conservation and carbon reduction has been valued by the public,
which has led more people to choose to ride bicycles instead of the original carbon-discharging vehicles,
not only to meet the purpose of environmental protection, but also to achieve the effect of sports.
The bicycle sprocket commonly used in the market applies the round sprocket which has the problem of dead point. Conversely,
the non-circular sprocket has the advantage of quickly passing the dead point and reducing the muscle utilization rate to achieve labor-saving effect.
In order to improve the riding efficiency of bicycles, it is of potential market value to explore and study non-circular sprocket.
Because the pedaling force of human’s left and right feet is different, and the pedaling force is different at each angle,
in order to obtain the better riding efficiency,
this study proposes the special non-circular sprocket designs to improve the uneven force of the left and right feet.
Then, the computer aided program is developed for the non-circular sprocket,
and the corresponding non-circular sprocket can be obtained according to the required parameter conditions and the pitch curve can be divided into integral multiples of the chain pitch.
The study investigates the non-circular sprocket and the traditional circular sprocket for experimental analysis,
and with the digital image to measure the pedal angle in the riding to get the pedaling force.
The force of each joint is calculated by the pedaling force and the balance equation of the simulated five-bar linkage mechanism,
and then the advantages and disadvantages of different sprocket wheels are analyzed. In this study,
the best non-circular sprocket in this experimental design was found by measuring the efficiency, torque, rotational speed,
and joint force through experiments of multiple subjects.

摘要...i
Abstract...ii
誌謝...iv
目錄...v
表目錄...vii
圖目錄...viii
第一章 緒論...1
1.1 前言...1
1.2 研究方法...2
1.3 文獻探討...4
第二章 非圓形鏈輪之設計...6
2.1 橢圓形節曲線...6
2.2 橢圓形鏈盤齒形之中心點...7
2.3 齒形設計...10
2.4 橢圓形鏈盤之齒間角...14
2.5 非圓形鏈輪設計理念...15
2.6 曲柄角度與齒盤搭配之探討...19
2.7 小結...23
第三章 自行車五連桿機構分析...24
3.1 角度分析...25
3.2 角速度分析...29
3.3 角加速度分析...30
3.4 自由體圖與動力平衡方程式...32
3.5 受測者腿部參數...36
3.6 小結...37
第四章 實驗分析...38
4.1 實驗機台介紹...38
4.2 實驗機台力量校正...40
4.3 關節受力之比較...42
4.4 左右腳扭力之比較...44
4.5 不同非圓形鏈輪之效率比較...53
第五章 結論與未來展望...61
5.1 結論...61
5.2 未來展望...62
參考文獻...63
Extended Abstract...65

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