The inner circulation of the ball screw adopts a reverser to realize the ball circulation. There are two types of reversers. Cylindrical convex key reverser, its cylindrical part is embedded in the nut, and the end is provided with a reverse groove 2. The reverse groove is positioned by the cylindrical outer surface and the round key 1 at the upper end to ensure the alignment of the thread raceway direction.
Oval insert reverser, the reverser is a general round head flat key insert, the insert is embedded in the slot of the nut, and the end is opened with a reverse groove 3, which is positioned by the outer contour of the insert. Comparing the two inverters, the latter has a smaller size, which reduces the radial size of the nut and shortens the axial size. However, the outer contour of this kind of reverser and the dimensional accuracy of the slot on the nut are required to be high.
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