Dual-nut ball screw assembly with controllable pre-tightening force

A ball screw pair and pre-tightening nut technology, applied in the direction of transmission, belt/chain/gear, transmission parts, etc., can solve the problem of not being able to accurately reflect and adjust the size of the pre-tightening force, so as to improve accuracy retention and The effect of reliability, high dynamics

Inactive Publication Date: 2015-04-29
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims at the deficiencies existing in the existing ball screw pair preloading technology, such as the inability to accurately reflect and adjust the size of the pr

Method used

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  • Dual-nut ball screw assembly with controllable pre-tightening force
  • Dual-nut ball screw assembly with controllable pre-tightening force
  • Dual-nut ball screw assembly with controllable pre-tightening force

Examples

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Embodiment Construction

[0020] The double-nut ball screw pair with controllable pretightening force of the present invention, such as figure 1 As shown, it includes a lead screw 1 and two lead screw nuts (A lead screw nut 2 and B lead screw nut 3), both of which are connected to the lead screw. Wherein the B lead screw nut 3 is provided with two circular pre-tightening nuts 5 . A giant magnetostrictive actuator 4 ( figure 1 There are three in the middle, uniformly distributed at intervals of 120 °), a force sensor 6 is set between one end of each giant magnetostrictive actuator 4 and the A lead screw nut 2. The number of giant magnetostrictive actuators 4 can be determined according to the outer diameter of the lead screw 1 and the load it receives. The force sensor 6 adopts a piezoelectric force sensor to obtain the magnitude of the pretightening force in time. The pre-tightening nut 5 is connected to the B screw nut 3 and is used to set the initial pre-tightening force of the double-nut ball scr...

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Abstract

A dual-nut ball screw assembly with controllable pre-tightening force comprises a screw and two screw nuts; the screw nuts are both connected to the screw; one screw nut is provided with a pre-tightening nut; super-magnetostrictive actuators evenly distributed in the peripheral direction are connected between the other screw nut and the pre-tightening nut; one end of each super-magnetostrictive actuator is provided with a force sensor; the pre-tightening nut is used for setting initial pre-tightening force of the assembly; the magnitude of the pre-tightening force is limited to one-third of a load. The pre-tightening force of the screw and the nuts is increased or decreased through expansion of super-magnetostrictive expansion rods, the screw is automatically tightened with safety and reliability ensured, and transmission precision retentivity and reliability of the assembly is improved.

Description

technical field [0001] The invention relates to a double-nut ball screw pair whose pretightening force can be adjusted, and belongs to the technical field of the ball screw pair. Background technique [0002] Manufacturing is the basis for enhancing national competitiveness. Ball screw pair is an important functional part of CNC machine tools, and its performance directly affects the overall level of CNC machine tools. With the high speed and high precision of CNC machine tools, higher and higher requirements are put forward for the precision performance index of the ball screw pair. In addition to the requirements for the transmission accuracy in a single direction, the ball screw pair also has strict requirements for its axial clearance to ensure the transmission accuracy in the reverse direction. The axial clearance of the ball screw pair is the sum of the displacement of the nut caused by the elastic deformation of the contact point between the ball and the raceway pro...

Claims

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Application Information

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IPC IPC(8): F16H25/22F16H57/12
CPCF16H25/2209F16H57/12F16H2057/123F16H2057/126
Inventor 林明星王庆东张胜鞠晓君
Owner SHANDONG UNIV
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