介紹 Introduction
現代溜溜球越來越講求高精度，且採用高等級CNC車床製作，無不是為了達到更穩定的空轉。以精密CNC車床來說，要製作到非常精準的單一溜溜球本體（圖一）是一件非常容易的事情。可是當兩個本體組合在一起時難免會因為一些誤差，導致兩條個別來自於兩個本體的軸心線無法對齊，當兩條軸心無法對其時因為重心偏移而使空轉會晃動。因此研究如何將兩條軸心線對齊是悠九系列開發計畫的重點之一。
Yo-yo keeps improving with the time. Most players need more stable long sleeper. As a consequence, yo-yo became more and more accurate. In this generation of technology, it is very easy to get a high class yo-yo (Fig. 1). Thanks to CNC lathe. However, it is hard to avoid the error of the assembling of two yo-yo bodies. This article is about Exclusive Axle System by Yonity's research.
Yo-yo keeps improving with the time. Most players need more stable long sleeper. As a consequence, yo-yo became more and more accurate. In this generation of technology, it is very easy to get a high class yo-yo (Fig. 1). Thanks to CNC lathe. However, it is hard to avoid the error of the assembling of two yo-yo bodies. This article is about Exclusive Axle System by Yonity's research.
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圖一 單一的溜溜球本體是用一整塊鋁經由CNC車床加工而成，完全一體成型。
Figure 1. The single body milling high class yo-yo by CNC lathe. |
傳統技術 Tradition
以我們一般常見的溜溜球來說，大部分都是利用溜溜球本體的尺寸（圖二）與滾珠軸承的內壁（圖三），使左右兩個本體分別對中間的滾珠軸承緊密的夾住，由於滾珠軸承是一個極精密的標準零件，所以他的內壁一定是完美的圓柱型，藉此達到讓兩個本體對齊的效果。像是Yoyofactory與YoyoJam都是採用此方法。
Most makers solve this problem by the bearing, like YYF or YYJ. The bearings are very accurate. Two yo-yo bodies aligned by the inner of the bearing. As Fig. 2 and 3, here is the principle.
Most makers solve this problem by the bearing, like YYF or YYJ. The bearings are very accurate. Two yo-yo bodies aligned by the inner of the bearing. As Fig. 2 and 3, here is the principle.
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| 圖三 綠色為滾珠軸承內壁 Figure 3. The green surface is the inner of bearing. |
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| 圖二 黃色為溜溜球本體與滾珠軸承接觸面 Figure 2. The yellow surface is where connect the bearing. |
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| 圖四 藍色為溜溜球本體的剖面，紅色為滾珠軸承的剖片，黃色線條為滾珠軸承與溜溜球本體緊密接觸的部分。 Figure 4. The blue area is the cross-section of yo-yo bodies. The red is the cross-section of bearing. The yellow lines are where yo-yo bodies attach bearing closely. |
可惜此技術有個美中不足的地方，當每次滾珠軸承卡異物需要拔下來清理的時候，由於滾珠軸承緊密的卡在溜溜球本體上，所以在清理時特別麻煩，需要拿工具拆下。除此之外，會因為溜溜球長期的拆裝導致本體與滾珠軸承接觸的地方磨損，最終導致失去這個功能。
However, every time you want disassemble the bearing to clean, you need a tool. In Yonity's opinion, there must are some where could improved.
However, every time you want disassemble the bearing to clean, you need a tool. In Yonity's opinion, there must are some where could improved.
悠九技術 New Design by Yonity
悠九參考了市面上所有溜溜球在處理對齊兩條軸心線的方法，發現市面上以Oxygène公司的方法最為特別，可惜他的設計零件過於複雜會增加售價，且溜溜球間隙並不固定會有解體危險，除此之外還有滾珠軸承不在溜溜球內部正中心也會有重心測移的問題。為了解決上述問題且一樣具有軸心線對齊的功能，悠九特別開發了軸心對正系統，一種全新的軸心設計（圖五）。
Yonity refer to all designs include Oxygène. And we made some improve, cost down and keep the bearing on the center (it means you can use the concave bearing.). Finally, we designed this new axle which made of stainless steel 316L(Fig.5).
Yonity refer to all designs include Oxygène. And we made some improve, cost down and keep the bearing on the center (it means you can use the concave bearing.). Finally, we designed this new axle which made of stainless steel 316L(Fig.5).
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| 圖五 使用316L不鏽鋼製作的特殊軸心 Figure 5 The new axle made of 316L. |
跟以往不同的是，它不再利用溜溜球於滾珠軸承的關係，而是利用溜溜球本體上的凹椎型面（圖六）與特製軸心上的錐形面（圖七），兩個互相在溜溜球鎖緊的時候緊密對齊，達到軸心線對齊的效果。由於椎型有尺寸漸縮的設計，加上尺寸的搭配，其實溜溜球本體上的錐形半徑是比較小的，所以當溜溜球鎖緊時所有的零件會彼此卡住不容易解體。除此之外，值得一提的是當兩邊溜溜球本體都鎖到底時，並沒有完全把滾珠軸承夾住，最後約有0.01公厘的空隙。
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| 圖六 黃色為溜溜球本體的凹錐形面 Figure 6. The yellow surface is the taper on the body. |
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| 圖七 綠色維特製軸心的錐形面 Figure 7. The green surface is the taper on the axle. |
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圖八 藍色為溜溜球本體剖面，紅色為滾珠軸承剖面，黃色線條為溜溜球本體與特製軸心接觸的部分。
Figure 8. The blue area is the cross-section of yo-yo bodies. The red is the cross-section of bearing. The yellow lines are where yo-yo bodies attach the axle closely.  |
