英语翻译The length-to-diameter ratio of a bushing is important.A

英语翻译
The length-to-diameter ratio of a bushing is important.Allowable bering pressure per square inch of projected ared .The projected area is defined as the product of the length
of the bearing and the nominal inside diameter.Figure 7.3 shows the L- and D-dimensions
of asimple bearing of this type.The L/D ratio is seldom less than 1.If it is too small,lubrication becomes a real problem.If the ratio is greater than 4,there may be alignment problems and additional lubrication problems.In general,the most practical values for L/D ratio fall between 1 ½ and 2.Many off-the-shelf bushangs are available in this range.

The length-to-diameter ratio of a bushing is important.
轴衬的长-径比很重要.
Allowable bearing pressure per square inch of projected ared .
投影面积上每平方英寸容许承载压力
The projected area is defined as the product of the length of the bearing and the nominal inside diameter.
投影面积的定义为：轴承的长度和标称内径的乘积.
Figure 7. 3 shows the L- and D-dimensions of a simple bearing of this type.
图7.3为这类轴承的L（长度）和D（标称内径）尺寸规格
The L/D ratio is seldom less than 1.
L/D比值很少小于1
If it is too small,lubrication becomes a real problem.
如果该比值太小,润滑就成为实际问题.
If the ratio is greater than 4,there may be alignment problems and additional lubrication problems.
如果该比值大于4,就可能存在对中找正的问题,以及额外的润滑问题.
In general,the most practical values for L/D ratio fall between 1 ½ and 2.
总之,实际上最常见的L/D的比值处于1.5和2之间.
Many off-the-shelf bushings are available in this range.
许多轴衬的产品都符合这个范围.

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