Patent ID: 9145958
Filing Date: 2015-09-29
Classification: F16H,Y10T

Abstract:
1. A ball screw capable of surveillance and control of preload, comprising: a screw rod having an external thread; two screw nuts, each of which has an internal thread and a circulatory passage, the circulatory passage having an entrance and an exit at two ends thereof, the two screw nuts being sleeved onto the screw rod, a spiral path being formed between the internal threads and the external thread and communicating with the circulatory passage, each of the two screw nuts having a keyway located on a toric surface of an opposite end of each screw nut, the two keyways facing each other; a link mounted inside the keyways and traversing the two screw nuts, wherein the link extends across the opposing ends of the two screw nuts; a force sensor mounted between opposite sides of the two screw nuts and squeezed by the opposite sides of the two screw nuts; and a plurality of balls located inside the spiral path or the circulatory passage and keeping rolling while moving.