A kind of backlash-free screw adjusting mechanism

Abstract

The invention discloses a gapless thread adjusting mechanism which comprises an adjusting screw, a guide nut, a pretightening nut and a pretightening screw cap. The adjusting screw is cylindrical, an external thread is processed on the outer surface of the adjusting screw, the guide nut is placed outside the adjusting screw in a sleeved manner, an internal thread matched with the external thread of the adjusting screw is processed on the inner surface of the guide nut, each of two ends of the guide nut is a conical face, a deformation groove is formed in each of two end faces of the guide nut, the pretightening nut is placed outside the guide nut in a sleeved manner, an internal thread is processed on the inner surface of one end of the pretightening nut, the other end of the pretightening nut is a conical face which is matched with one conical face of the guide nut, the pretightening screw cap is placed outside the guide nut in a sleeved manner, an internal thread is processed on the inner surface of one end of the pretightening screw cap, the other end of the pretightening screw cap is a conical face which is matched with the other conical face of the guide nut, and the internal thread of the pretightening nut and the external thread of the pretightening screw cap are in matched connection to enable the guide nut and the adjusting screw to be positioned in an inside cavity formed by the pretightening nut and the pretightening screw cap.

Description

technical field [0001] The invention relates to the technical field of mechanical parts, in particular to a backlash-free screw adjusting mechanism. Background technique [0002] At present, in many workbenches, tripods, theodolites, adjustable guide rails and other institutions in the laboratory, level or displacement adjustments are required, and these adjustment mechanisms basically use threads for height or stroke adjustment. There is inevitably a certain gap in the cooperation between the external threads. When the thread is used to adjust the mechanism, there will be a small idle stroke in this gap when the thread mechanism is used for precision adjustment. Install a special anti-backlash mechanism to eliminate the thread gap and improve the adjustment accuracy. The current anti-backlash mechanism in China mainly adopts the following two structural forms: [0003] One method is to adopt a backlash-free transmission nut structure. The transmission thread on the inner s...

AI Technical Summary

Problems solved by technology

The advantage of this kind of thread transmission is that power can be transmitted through the thread in forward and reverse directions. The disadvantage is that the whole mechanism has a long thread stroke, high cost, relatively complicated structure, and takes up a large space. The entire thread structure assembly requires special tooling, which is not suitable for small mechanism

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