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Releasable nut in sandwich type cantilever beam bending vibration working pattern

A working mode, bending vibration technology, applied in the direction of generator/motor, piezoelectric effect/electrostrictive or magnetostrictive motor, electrical components, etc. The problems of high production cost and complicated operation can achieve the effect of simple structure, low production cost and extended application field.

Inactive Publication Date: 2015-03-18
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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  • Releasable nut in sandwich type cantilever beam bending vibration working pattern
  • Releasable nut in sandwich type cantilever beam bending vibration working pattern
  • Releasable nut in sandwich type cantilever beam bending vibration working pattern

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Experimental program
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Effect test

specific Embodiment approach 1

[0010] 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;

[0011] 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 internal thread 1-3 is rotatably connected with a screw 1-1, and the thread rise angle of the internal thread 1-3 is smaller than the equivalent friction angle between the internal thread 1-3 an...

specific Embodiment approach 2

[0012] 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

[0013] 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 1-3 of the nut base 1 and the external thread of the screw 1-1 in the state of the cantilever beam can be trapezoidal threads, triangular threads, rectangular threads, serrations thread, pipe thread or non-standard thread. Other compositions and connections are the same as in the first embodiment.

[0014] Working principle: The unlockable nut in the sandwich-type cantilever beam bending vibration working mode 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, and uses the high-frequency vibration to generate The anti-friction effect reduces the friction coefficient between the unlockable nut and the screw, destroys the self-locking condition between the thread pairs, and makes the u...

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Abstract

The invention provides a nut allowing unlocking in a sandwich type cantilever beam bending vibration working pattern, and belongs to the field of fasteners and transmission parts by utilizing connection of a thread pair. The nut allowing unlocking in the sandwich type cantilever beam bending vibration working pattern aims at conveniently, quickly and flexibly achieving conversion and control of two working states of self-locking and unlocking between the thread pair. A circle of circular grooves is formed in a small-diameter outer circle surface of a nut body in a cantilever beam state, piezoelectric flexible circular rings are composed of a plurality of piezoelectric flexible pieces, the piezoelectric flexible circular rings are embedded in the circular grooves of the nut body in the cantilever beam state, the end faces of the piezoelectric flexible circular rings on the two sides are respectively connected with the end faces inside the circular grooves on the two sides, and a driving method of the piezoelectric flexible circular rings is a traveling wave shock excitation working pattern or a standing wave shock excitation working pattern. When driving signals are input in the piezoelectric flexible pieces, the nut allowing unlocking in the sandwich type cantilever beam bending vibration working pattern ensures that the self-locking working state is converted into the unlocking working state, and therefore friction coefficient between the thread pair is greatly reduced, and the self-locking working state between the nut body and a screw vanishes.

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): H02N2/00
Inventor 程廷海包钢刘士明孟丽霞
Owner HARBIN INST OF TECH