Method for eliminating return difference automatically by using double nuts for lead screw nut pair
A lead screw nut, double nut technology, applied in the direction of transmission, belt/chain/gear, mechanical equipment, etc., can solve the problems of poor axial rigidity of double nut structure, unable to meet the requirements of large load and high precision motion transmission, etc. , to achieve the effect of high reliability, high precision and simple manufacturing
Inactive Publication Date: 2012-01-04
HUBEI UNIV OF AUTOMOTIVE TECH
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Problems solved by technology
[0004] However, due to the use of artificial rubber high elastic washers in this patent, the axial stiffness of the double nut structure is poor, which cannot meet the requirements of large load and high precision motion transmission.
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[0013] like figure 1 Among them, the fixed nut 1 can be fixed on the active part for rotation, or installed on the driven part for translational movement, and the corresponding lead screw 3 can be installed on the driven part for translational movement, or installed on the active part for rotation. The non-fixed nut 2 and the fixed nut 1 cooperate with the screw thread pair of the lead screw 3 at the same time. The elastic torsion device is composed of the non-fixed nut spring stopper 5, the fixed nut spring stopper 7 and the spring 6, which are respectively fixed on the fixed nut 1 by screws 4. and non-retaining nut 2 on. The elastic force of the spring 6 forces the non-fixed nut 2 to rotate relative to the fixed nut 1. The right-handed thread rotates clockwise, and the left-handed thread rotates counterclockwise. The non-fixed nut 2 is pressed against the fixed nut 1, so that the conical fitting surface between them combine. In order to ensure that the elastic torsion devi...
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The invention provides a method for eliminating a return difference automatically by using double nuts for a lead screw nut pair. In the double nuts, one nut is arranged on a stressed part and is named a fixed nut, the other nut is a non-fixed nut, and the two nuts rotate in the opposite directions by using an elastic torsion device; the torque of the elastic torsion device is greater than static friction torque formed when axial force is not formed between a transmission lead screw and the nut pair, so that the double nuts can always rotate in the opposite directions and are compacted mutually; the double nuts contact two sides of lead screw threads to eliminate a return difference gap automatically; opposite matching surfaces of the double nuts are matched by conical surfaces; and when an equivalent friction coefficient of a conical surface contact pair is greater than that of a tooth-shaped angle of a transmission thread pair, the non-fixed nut in the double nuts does not rotate with the lead screw in spite of the size of transmission friction torsion between the lead screw and the nuts and the positive or negative rotation of the lead screw or the nuts, so the aim of eliminating the transmission gap between the lead screw and the nuts is fulfilled, and the phenomenon of locking or loosening the nuts is avoided.
Description
technical field [0001] The invention relates to a method for automatically eliminating hysteresis with double nuts for a lead screw nut pair. Background technique [0002] In mechanical transmission, thread transmission is widely used in occasions where rotary motion is changed to linear motion. Whether it is an ordinary threaded screw, ball screw or planetary roller screw, as a high-precision motion transmission, it is necessary to consider the problem of two-way transmission motion gap, which is called hysteresis. Eliminating hysteresis is generally called backlash elimination, elimination of backlash or elimination Difference. The hysteresis is often caused by the assembly clearance of the parts or the wear of the parts. In the process of reciprocating transmission, the existence of backlash gap will cause the loss of motion accuracy, that is, the driven part cannot follow the movement of the active part accurately in real time, which is mainly manifested in the time of...
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Inventor 张春
Owner HUBEI UNIV OF AUTOMOTIVE TECH