界限线

选用蜗杆副螺旋角β作为参数，推导了TI蜗杆副蜗轮齿面上啮合界限线存在的判定条件。

With helix angle β chosen as parameter , the criterion for existence of meshing boundary line on the surface of TI worm gearing is derived .

分析接触面间发生干涉的情况、二次接触现象、啮合界限线和根切界限线存在的情况。

Analyze interface condition of the two contact surfaces , secondary contact phenomenon , existence of meshing boundary line and undercut boundary line .

从接触线和啮合界限线的角度对二次包络TI蜗杆传动进行了接触性能分析。

From the point of view of the contact line and the meshing limit line , the contact performance of double enveloping TI ( Torioidal Involute ) worm gearing is analysed .

分析表明，只有当蜗轮齿面上的啮合界限线为一条或两条且这两条线不重合时，才能在二次包络TI蜗杆传动副的蜗轮齿面上得到二次接触线；

The results show that only when there is one meshing limit line on the worm tooth flank or two lines which are not coincide with each other can the second contact line be seen on the worm tooth flank of double enveloping TI worm gearing .

界限线图上的每条界限线都描述了不同的飞机性能要求下的翼载和推重比之间的关系。

In the sizing diagram , the boundaries of different performance requirements are plotted as functions of the wing loading and thrust-to-weight ratio .

采用使两条啮合界限线重合的螺旋角度，或略小于此值，均可获得较好的啮合质量。

If helix angle is equal to or slightly smaller than the angle which makes two meshing boundary lines coincide with each other , preferable meshing performance is obtained .

分析表明，蜗轮齿面上啮合界限线的分布情况有4种：不存在啮合界限线，有一条啮合界限线，有两条啮合界限线，以及两条啮合界限线完全重合。

Results show that there can be four situations for meshing boundary line on the tooth surface of wheel , namely , inexistence of boundary line , a unique line , two lines and two coincident lines .

在地毯图中，描述了飞机推重比和翼载与客机最大起飞重量之间的相互关系。同时依据界限线的绘制方法，也将客机各个设计性能要求绘制在同一张图上。

In the carpet plot module , the relation of the aircraft takeoff weight with the wing loading and thrust-to-weight ratio are displayed on the carpet plot , and various requirement boundaries are also plotted on the same plot .

并在理论基础上编制了相应的计算机程序，自动生成接触线族及啮合界限线，对不同参数条件下的啮合情况进行分析，可以使工艺条件达到最佳状态；

On the basis of the theory , the computer program is worked out to automatically produce the contact line and the boundary curves of mesh . Analysis of meshing circs under different parameters can be done so that we can gain the best process condition .

决定一个区域的界限的线。

A line determining the limits of an area .

国家间的界限不是一条线而是一个为创造新事物的空间。

Borders of the nations is not a line but a space to create new things .

林线是指森林分布的最高界限，高山林线是山地垂直带中的亚高山植被与高山植被的分界线，以及所生长的植被类型发生急剧变化的地段。

The tree-line refers to the highest boundary , forest distribution Timberline is the mountain Vertical band sub-alpine vegetation and alpine vegetation and the boundary , the growth of vegetation types changes took place in the area .