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大家知道,目前使气阀保持闭合的方法是利用螺旋弹簧装在阀杆上,一端顶住气缸盖,另一端顶住上弹簧座。上弹簧座的形状象一顶倒置的帽子,由一对半圆锁圈紧固在阀杆的上端。两个半圆锁圈的剖面都是半圆形,合在一起形成的外表面是圆锥形,与上弹簧座中的圆锥孔正好相配合。每一半圆锁圈的内圆表面上,有一道锁肩,位于两端之间,可与阀杆上端的一道锁槽相嵌合。因此,当上弹簧座被弹簧推到锁圈上以后,锁圈上的锁肩嵌在阀杆上的锁槽中,同时,由于圆锥面的斜楔作用,使保持器的锥孔与锁圈上的锥体锁紧在一起。
As we all know, the current method of keeping the valve closed is to use a helical spring mounted on the valve stem, one end to withstand the cylinder head, the other end to withstand the spring seat. The upper spring seat is shaped like an inverted hat and is secured to the upper end of the valve stem by a pair of semi-circular locking rings. The two semi-circular locking rings are semicircular in cross-section, and the outer surfaces combined together form a conical shape that exactly matches the conical hole in the upper spring seat. On the inner circular surface of each semi-circular locking ring, there is a locking shoulder located between the two ends for engagement with a locking groove at the upper end of the valve stem. Therefore, after the upper spring seat is pushed onto the locking ring by the spring, the locking shoulder on the locking ring is embedded in the locking groove on the valve rod. At the same time, due to the wedging action of the conical surface, the tapered hole of the retainer and the locking ring The cone on the lock together.