这永远都是成立的，但只有纯滚动的条件下才会成立。
This is always true, but this is only true when it is pure roll.
它们将滚下来，纯滚动。
这就是纯滚动的条件。
我将会探讨着个情况，当这是个纯滚动的情况。
所以这里是滑移和滑动，而不是纯滚动的情况。
So then we have skidding and we have slipping and then we don't have the pure roll situation.
什么是纯滚动呢？
这点保持不变，但是纯滚动中，这不变。
如果是纯滚动，摩擦基本上，小于可能的，最大值。
If the object is in pure roll, the friction could be substantially less than the maximum friction possible.
本文讨论了物体在任意曲面上纯滚动的约束问题。
In this article, we have discussed the problem of restriction of a body's pure roll on arbitrary curved surface.
我还是想提醒你们，只有在纯滚动的条件下，这些才是成立的。
I want to remind you, though, that it is only true if we have a situation of pure roll.
分析了瞬心的加速度特性，建立了刚体平面纯滚动的轨迹方程。
The characteristics of the acceleration of the instantaneous velocity center (IVC) were presented, and the trajectory equation for pure rolling of rigid body (PRORB) was developed.
非平行的齿轮，非交叉传动的轴也有节点，但不存在纯滚动节圆的概念。
Gears on nonparallel, non-intersecting shafts also have pitch circles, but the rolling-pitch-circle concept is not valid.
本文引入平面瞬心副（纯滚动副），提出了平面机构结构公式的新含义。
This paper gives a new explanination to the structural formula of plane mechanisms with the help of introducing the rolling pair.
在纯滚动情况下，Q的速度，和圆周的速度，如果你们看得到-，是相同的。
When we have pure roll, the velocity of this point Q, and the velocity of the circumference, - if you can read that — are the same.
偏心渐开线齿轮传动设计的纯滚动模型、等转角模型和等分模型存在模型误差。
The pure rolling model, equal turning Angle model and bisection model for the design of eccentric involutes gears transmission have model error.
提出了一种纯滚动矫直的新方法，解决了高表面质量的不锈钢钢筋的无划伤矫直问题。
A new method of pure roll straitening is put forward in this article. The problem of straitening to reinforcing stainless steel bar with high surface quality is solved.
从滚刀节曲线与齿轮工件节曲线之间必须进行纯滚动出发，推导出联动关系为4个坐标的复杂联动。
According to the fundamentals that pure-rolling must take place between the pitch line of hob and the pitch curve of gear workpiece, the 4 axis complicated simultaneous-control relation was obtained.
滚动振动试验台的一个主要功能就是进行机车车辆运动稳定性试验，这也是纯滚动试验台所具有的唯一功能。
One of the main capabilities of roller rig is to test and study the stability of rail vehicles. This is also the only function for roller rigs (with pure rotation without excitement) have.
差速器是当汽车转弯行驶或在不平等路面上行驶时，使左右驱动车轮以不同的转速滚动即保证两侧驱动车轮作纯滚动运动。
Differential when the vehicle is moving or turning in inequality when the road to drive around to different speed wheels rolling on both sides of drive wheel that is for pure rolling motion.
差速器是当汽车转弯行驶或在不平等路面上行驶时，使左右驱动车轮以不同的转速滚动即保证两侧驱动车轮作纯滚动运动。
Differential when the vehicle is moving or turning in inequality when the road to drive around to different speed wheels rolling on both sides of drive wheel that is for pure rolling motion.
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