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Unlockable nut in sandwich cantilever longitrorse mode conversion working mode

A mode conversion and working mode technology, applied in the direction of nuts, screws, bolts, etc., can solve the problems of limited application occasions of threaded fasteners and transmission parts, high production cost, cumbersome operation, etc., and achieve simple structure and low production cost. Low, the effect of expanding the application field

Inactive Publication Date: 2015-03-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, for the conversion and control of the two working states of self-locking and unlocking between thread pairs, it is often necessary to use a self-locking nut with self-locking function and a corresponding unlocking mechanism to work together. The self-locking and unlocking state conversion mechanism has problems such as complex structure, cumbersome operation, and high production cost, which limits the application occasions of threaded fasteners and transmission parts

Method used

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  • Unlockable nut in sandwich cantilever longitrorse mode conversion working mode
  • Unlockable nut in sandwich cantilever longitrorse mode conversion working mode
  • Unlockable nut in sandwich cantilever longitrorse mode conversion working mode

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Experimental program
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specific Embodiment approach 1

[0012] Specific implementation mode one: see figure 1 , figure 2 , image 3 To illustrate, this specific embodiment is composed of a nut base 1 in a cantilever beam state and a piezoelectric telescopic ring 2;

[0013] The nut base 1 in the cantilever beam state adopts the cantilever beam restraint method, and the nut base 1 in the cantilever beam state has a T-shaped design structure, and its T-shaped large-diameter end adopts the cantilever beam restraint mode and is processed with several positioning holes for installation and fixing. 1-2; the T-shaped small-diameter outer surface is provided with a circumferential groove 1-4, the inner surface of the nut base 1 in the cantilever beam state is provided with internal threads 1-3, and the nut base 1 in the cantilever beam state The screw rod 1-1 is rotated in the internal thread 1-3 of the internal thread 1-3, and the thread rise angle of the internal thread 1-3 is smaller than the equivalent friction angle between the int...

specific Embodiment approach 2

[0014] Specific implementation mode two: see figure 1 , figure 2 , image 3 To illustrate, the difference between this embodiment and the first embodiment is that the driving frequency of the piezoelectric stretchable sheet 2-1 coincides with or is close to the resonance frequency of the nut base 1 in the cantilever state, so as to excite the cantilever state. The nut base 1 is in a state of ultrasonic vibration; the waveform of the driving electric signal of the piezoelectric expansion sheet 2-1 can be a sinusoidal alternating current signal, a square alternating electric signal, a triangular alternating current signal or a zigzag alternating electric signal. Other compositions and connections are the same as in the first embodiment.

specific Embodiment approach 3

[0015] Specific implementation mode three: see figure 1 , figure 2 , image 3 To illustrate, the difference between this embodiment and the first embodiment is that the internal thread of the nut base 1 and the external thread of the screw rod 1-1 in the state of the cantilever beam can be trapezoidal threads, triangular threads, rectangular threads, zigzag threads, Pipe thread or non-standard thread. Other compositions and connections are the same as in the first embodiment.

[0016] Working principle: The unlockable nut in the working mode of sandwich cantilever longitudinal torsion mode conversion mainly excites the unlockable nut to be in a high-frequency (generally greater than 1000Hz) micro-vibration state through the piezoelectric expansion sheet 2-1. The anti-friction effect generated by the vibration reduces the friction coefficient between the unlockable nut and the screw rod, and destroys the self-locking condition between the thread pairs, so that the unlockabl...

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Abstract

The invention relates to an unlockable nut in a sandwich cantilever longitrorse mode conversion working mode and belongs to the field of fasteners and driving media connected by screw thread pairs. The nut realizes convenient, quick and flexible conversion and control between a self-locking working state and an unlocking working state of the screw thread pairs. A piezoelectric telescopic ring of the nut consists of a plurality of piezoelectric telescopic sheets, and is embedded into a ring groove of a nut body in a cantilever state; the two side end faces of the piezoelectric telescopic ring are connected with the two side end faces in the ring groove respectively; a plurality of deep grooves and a plurality of columns of small holes are formed in the excircle surface of the nut body in the cantilever state in the circumferential direction; all the piezoelectric telescopic sheets can be driven independently or in a group manner; and driving phases of the piezoelectric telescopic sheets are the same during grouped driving. According to the nut, when the piezoelectric telescopic sheets input driving signals, the self-locking working state of the nut body is changed into the unlocking working state, that is the friction coefficient among the screw thread pairs is reduced greatly, and the self-locking working state between the nut body and a threaded rod disappears.

Description

technical field [0001] The invention belongs to the field of fasteners and transmission parts connected by thread pairs. Background technique [0002] Fasteners and transmission parts based on thread pairs are widely used in equipment, systems, devices and mechanisms in various industries today. For the thread pair connection pair, there are mainly two working states, which are the thread self-locking state and the non-self-locking state, and the latter can also be called the unlocking state. For the self-locking working state of the thread pair, the thread pair used should generally meet the thread self-locking conditions, that is, the thread lead angle is smaller than the equivalent friction angle between the thread pairs. The main application occasions are fastening of parts, sliding transmission guide rails and Jacks and other aspects of force transmission; for the unlocking working state of the thread pair, that is, satisfying that the thread lift angle is greater than...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16B37/00F16B39/02F16H25/24
Inventor 程廷海包钢唐晚静
Owner HARBIN INST OF TECH