ball index
... 钢球单向阀 ball check valve 钢球分度装置 ball index 钢球滚筒式磨煤机 ball-tube mills ...
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该装置通过八个钢球利用摩擦力将动力进行输入输出，用一对斜齿轮进行分度调速，从而使自行车在0.75～1.22之间进行无级调速。
They are used to input or output the power through the friction and a pair of helical gears is also used to adjust the speed, so the speed can change between 0.75 and 1.22.
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