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Hydrostatic transmission is widely used in construction machine. The research of one of its hard cores, low speed high torque radial piston motor, is very important. To directly estimate the life of this kind of motor, and to design a orbit curve with the longest life at same condition, this paper gives theoretic research of the equal contact stress inner curve of radial piston motor. The research is divided into four parts:1 Taken all forces the piston endured into consideration when radial piston motor working, the force between roller and orbit is deduced.

静压传动技术在各类工程机械中得到广泛的应用，对作为其核心部件的径向柱塞式低速大扭矩液压马达的研究显得十分重要，为了能直接对这种马达进行寿命估计，并能在相同工况下求得寿命最长的轨道曲线，本文从设计等接触应力内曲线的角度对这类马达作探讨性的研究，主要从以下四个方面进行：(1)综合考虑径向柱塞式液压马达工作时的各种主要受力状况，对柱塞组件进行受力分析，并通过仿真分析影响轨道和滚动体间正压力的各个因素，得到正压力的简化表达式。

Petiole usually more than 10 mm, longest up to 20 mm; leaf blade up to 13 cm, oblong, ovate, or nearly rounded

通常的叶柄超过10毫米，长可达20毫米；叶片可达13厘米，长圆形，卵形，或近圆形 24

He got the longest stand ovation I have ever seen.

他受到了我所见到的最长时间的起立鼓掌欢迎。

He got the longest standing ovation I had ever seen.

他受到了我所见到的最长时间的起立鼓掌欢迎。

Isn't it odd how we can overcompensate for a short trip but do nothing for our longest holiday?

我们在短途旅行上花大钱，可是对最长的假期却什么都不做，这不是很奇怪吗？

An overthrust rupture zone has formed which is hitherto the most complicated in 3D spatial distributions and the longest in horizontal extension.

这次大地震形成了迄今为止在三维空间分布最为复杂、在水平方向延伸最长的逆冲型破裂带。

The pilgrimage will be the longest in his papacy and a test of the 81-year-old's stamina .

这次的朝圣活动将会是他任期内历时最长的一次，同时也体现了他81岁高龄的毅力。

The pilgrimage will be the longest in his papacy and a test of the 81-year-old's stamina.

这次的朝圣之旅是他做教皇期间最长的一次，也是对他81岁年纪的一次体力考验。

Finally he opened his parachute. His jump remains the longest free fall in history.

最后他终于打开了他的降落伞，他这一跳至今仍保持着史上最长的自由降落。

Place the longest dimension of the object containing circles or arcs parallel to the projection plane.

应使物体的最长尺寸结构与轴测投影面平行。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。