planar double-enveloping worm wheel tp-worm
...平面包络环面蜗杆 planar double enveloping worm, TP-worm 平面二次包络蜗轮 planar double-enveloping worm wheel TP-worm 锥面包络环面蜗杆 toroid enveloping worm with cone generatrix ..
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planar double-enveloping worm wheel tp-worm
平面双包络蜗轮顶蜗杆
以上为机器翻译结果，长、整句建议使用 人工翻译 。