拿甲、乙两个相同的硬币放在桌面上,并使它们靠在一起(如图1)。然后用手指将甲按住,使乙紧靠着甲作旋转运动。试问,当乙靠着甲旋转一周仍回到原来位置时,乙转了几圈?又,当甲、乙二币直径不等时,如何计算乙转的圈数?这个问题实质上是我们使用的行星减速器减速比计算原理。 Take A and B two identical coins on the table and put them together (Figure 1). Then press and hold the nail with your finger to make B close to A for rotation. Q: When B returns to its original position by rotating for a week, does B turn a few times? And when A and B have different diameters, how to calculate the number of turns? This problem is essentially what we use Planetary reducer reduction ratio calculation principle.