虽然平面二次包络环面蜗轮副具有传动效率高、承载能力大、使用寿命长等优点，但它的应用却始终受到限制。
Although the planar double-enveloping worm gearing has advantages of high transmission efficiency, excellent load capacity, long life cycle and so on, it has been used in a limited way.
使用实践证明，在相同的使用条件下，平面二次包络环面蜗杆传动副的传动性能比普通蜗轮蜗杆传动副好。
It has been proved by practices that the double enveloping worm gearing transmission is superior to the ordinary worm gearing transmission under the same condition.
较详细地介绍了用普通车床改装成加工平面二包蜗轮副专用机床的设计方法。
This paper introduces the design method of redoing ordinary lathe to special machine tool for manufacture planar second-enveloping worm wheel in details.
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