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齿轮箱或蜗轮箱的外伸轴,通常使用唇状密封圈来防止润滑油泄漏。这种密封结构简单、占用空间小,价格低,但密封性能不很可靠。国外最近发明了一种提高密封可靠性的新方法,就是在轴表面磨出细小的斜槽。即使这种斜槽细小到肉眼难以辨清的程度,而在轴旋转时,就足能使密封圈和轴之间产生泵吸效应,将润滑油送回轴承。这种密封结构如图所示。1、9为唇状密封圈套环,2、8为唇状密封圈,3为轴,6、7为刻磨在轴表面的两组斜槽,10为控制螺钉,11为输油孔,12为法
Outer shaft of gearbox or worm gearboxes, lip seals are often used to prevent oil leakage. This seal structure is simple, small footprint, low price, but the sealing performance is not very reliable. Abroad recently invented a new method to improve the reliability of the seal, is grinding the shaft surface of a small chute. Even if such a chute is so small that it is difficult to discern with the naked eye, it is sufficient to cause a pumping effect between the seal ring and the shaft when the shaft is rotated to return the lubricating oil to the bearing. This seal structure as shown. 1,9 for the lip seal ring, 2,8 for the lip ring, 3 for the shaft, 6,7 for grinding in the shaft surface of the two groups of chutes, 10 for the control screw, 11 for the oil hole, 12 For the law