CN103174724B - Releasable nut in sandwich type cantilever beam bending vibration working pattern - Google Patents
Releasable nut in sandwich type cantilever beam bending vibration working pattern Download PDFInfo
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- CN103174724B CN103174724B CN201310078046.0A CN201310078046A CN103174724B CN 103174724 B CN103174724 B CN 103174724B CN 201310078046 A CN201310078046 A CN 201310078046A CN 103174724 B CN103174724 B CN 103174724B
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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
The invention belongs to the securing member and driving member field that utilize screw thread pair to connect.
Background technology
Very extensive based on applying in the securing member of screw thread pair form and the equipment of driving member in current every profession and trade, system, device and mechanism.For screw thread pair auxiliary connection, main exist two kinds of operating states, and be respectively screw thread self-locking state and non-self-lock-ing state, wherein the latter also can be described as released state.For the self-locking operating state of screw thread pair, the screw thread pair adopted generally should meet screw thread self-locking condition, namely lead angle is less than the equivalent friction angle between screw thread pair, and main application scenario is fastening, the aspect such as drive rail of sliding and the jack carrying out power transmission of parts; For the unblock operating state of screw thread pair, namely meet lead angle and be greater than equivalent friction angle between screw thread pair, mainly utilize the motion screwing transmission system between nut and screw rod and Power output, be embodied in following three aspects, one is the conversion realized between rotary motion and rectilinear motion, two be for parts each in adjustment System between mutual alignment, three is obtain larger thrust output etc. with less input torque.At present, for self-locking between screw thread pair and the switch and control unlocking two kinds of operating states, often need to adopt the self-locking nut with auto-lock function and corresponding release mechanism associated working to realize simultaneously, there is the problems such as complex structure, complex operation, cost of manufacture height in this kind of mechanism by adding self-locking and released state translation function that unlocking structure mode realizes screw thread pair, limits the application scenario of screw thread pair securing member and driving member.
Summary of the invention
Realize self-locking between screw thread pair and the switch and control unlocking two kinds of operating states conveniently, fast, neatly, what the present invention proposes a kind of sandwich type cantilever beam flexural vibrations mode of operation can Unlockable nut.
Described sandwich type cantilever beam flexural vibrations mode of operation can Unlockable nut, be made up of the basal body of nut of cantilever beam state, the piezoelectricity annulus that stretches;
The basal body of nut of cantilever beam state is cantilever beam the way of restraint, and the basal body of nut of cantilever beam state is T-shaped project organization, and its T-shaped larger diameter end adopts cantilever beam the way of restraint and is processed with several for installing fixing location hole; The piezoelectricity annulus that stretches is made up of multi-disc piezoelectricity stretchable sheet, and multi-disc piezoelectricity stretchable sheet superposes connection successively, and all piezoelectricity stretchable sheets are annulus pad shape; The stretch type of drive of annulus of described piezoelectricity is row wave excitation mode of operation or standing wave exciting mode of operation; In row wave excitation mode of operation, the driving phase difference of the piezoelectricity stretchable sheet of adjacent sets 90 degree; The driving electric signal waveform of piezoelectricity stretchable sheet can be sinusoidal waveform ac signal, square waveform ac signal, triangular waveform ac signal or zigzag ac signal; The periphery of the T-shaped minor diameter of the basal body of nut of cantilever beam state has one week annular groove, the piezoelectricity annulus that stretches is embedded in the annular groove of the basal body of nut of cantilever beam state, and the stretch both sides end face of annulus of piezoelectricity is connected with the both sides end face in annular groove respectively; The inner headed face of the basal body of nut of cantilever beam state is provided with internal thread, and be rotatably connected in the internal thread of the basal body of nut of cantilever beam state screw rod, and the lead angle of internal thread is less than the equivalent friction angle between internal thread and screw rod connecting thread pair; Piezoelectricity stretchable sheet be circumferentially provided with two fan-shaped polarized areas and two fan-shaped insulation isolated areas, two fan-shaped polarized areas and two spaced contiguous circumferential of fan-shaped insulation isolated area difference are arranged, the telescopic direction of two fan-shaped polarized areas of piezoelectricity stretchable sheet is identical with the thickness direction of piezoelectricity stretchable sheet, the driving phase difference of the adjacent fan-shaped polarized area on each piezoelectricity stretchable sheet 180 degree; Row wave excitation mode of operation is the described piezoelectricity multi-disc piezoelectricity stretchable sheet stretched in annulus is that two panels becomes one group, and often in group, the fan-shaped polarized area of two panels piezoelectricity stretchable sheet and fan-shaped polarized area face, and their driving phase place is identical; Fan-shaped polarized area between adjacent sets and fan-shaped insulation isolated area face; Standing wave exciting mode of operation is one group and drives separately, and often in group, the fan-shaped polarized area of two panels piezoelectricity stretchable sheet and fan-shaped polarized area face, and their driving phase place is identical; The resonance frequency of the driving frequency of described piezoelectricity stretchable sheet and the basal body of nut of cantilever beam state is close, excites the basal body of nut of cantilever beam state to be in ultrasonic vibration state with this.
The present invention can when piezoelectricity stretchable sheet input drive signal, and make the self-locking operating state of basal body of nut change into unblock operating state, the coefficient of friction namely between screw thread pair significantly reduces, and the self-locking operating state between basal body of nut and screw rod is disappeared.The present invention also has that structure is simple, cost of manufacture is low, the advantage of applied range, can be used for the aspects such as the break-make in machine driven system, location and speeds control, extends the application of screw thread pair securing member and driving member.
Accompanying drawing explanation
Fig. 1 is the structural representation after the screw rod 1-1 that can be rotatably connected in Unlockable nut of sandwich type cantilever beam flexural vibrations mode of operation of the present invention;
Fig. 2 be in Fig. 1 piezoelectricity stretch annulus 2 launch decompose after structural representation;
Fig. 3 is piezoelectricity stretchable sheet 2-1 structural representation in Fig. 2.
Embodiment
Embodiment one: be described see Fig. 1, Fig. 2, Fig. 3, this embodiment is made up of the basal body of nut 1 of cantilever beam state, the piezoelectricity annulus 2 that stretches;
The basal body of nut 1 of cantilever beam state is cantilever beam the way of restraint, and the basal body of nut 1 of cantilever beam state is T-shaped project organization, and its T-shaped larger diameter end adopts cantilever beam the way of restraint and is processed with several for installing fixing location hole 1-2; The periphery of its T-shaped minor diameter has one week annular groove 1-4, the inner headed face of the basal body of nut 1 of cantilever beam state is provided with internal thread 1-3, the lead angle of screw rod 1-1, internal thread 1-3 of being rotatably connected in the internal thread 1-3 of the basal body of nut 1 of cantilever beam state is less than the equivalent friction angle between internal thread 1-3 and screw rod 1-1 connecting thread pair; The piezoelectricity annulus 2 that stretches is made up of multi-disc piezoelectricity stretchable sheet 2-1; All piezoelectricity stretchable sheet 2-1 are annulus pad shape, piezoelectricity stretchable sheet 2-1 is circumferentially provided with two fan-shaped polarized area 2-2 and two fan-shaped insulation isolated area 2-3, two fan-shaped polarized area 2-2 and two the spaced contiguous circumferential of fan-shaped insulation isolated area 2-3 difference is arranged, the telescopic direction of two fan-shaped polarized area 2-2 of piezoelectricity stretchable sheet 2-1 is identical with the thickness direction of piezoelectricity stretchable sheet 2-1, and multi-disc piezoelectricity stretchable sheet 2-1 superposes connection successively; The driving phase difference 180 degree of the adjacent fan-shaped polarized area 2-2 on each piezoelectricity stretchable sheet 2-1; The piezoelectricity annulus 2 that stretches is embedded in the annular groove 1-4 of the basal body of nut 1 of cantilever beam state, and the stretch both sides end face of annulus 2 of piezoelectricity is connected with the both sides end face in annular groove 1-4 respectively; The stretch type of drive of annulus 2 of described piezoelectricity is row wave excitation mode of operation or standing wave exciting mode of operation; Row wave excitation mode of operation is the multi-disc piezoelectricity stretchable sheet 2-1 that described piezoelectricity stretches in annulus 2 is that two panels becomes one group, and often in group, the fan-shaped polarized area 2-2 of two panels piezoelectricity stretchable sheet 2-1 and fan-shaped polarized area 2-2 faces, and their driving phase place is identical; Fan-shaped polarized area 2-2 between adjacent sets and fan-shaped insulation isolated area 2-3 faces; The driving phase difference of adjacent sets 90 degree; Standing wave exciting mode of operation is one group and drives separately, and often in group, the fan-shaped polarized area 2-2 of two panels piezoelectricity stretchable sheet 2-1 and fan-shaped polarized area 2-2 faces, and their driving phase place is identical.
Embodiment two: be described see Fig. 1, Fig. 2, Fig. 3, the difference of present embodiment and embodiment one is that the resonance frequency of described its driving frequency of piezoelectricity stretchable sheet 2-1 and the basal body of nut 1 of cantilever beam state matches or close, excites the basal body of nut 1 of cantilever beam state to be in ultrasonic vibration state with this; The driving electric signal waveform of piezoelectricity stretchable sheet 2-1 can be sinusoidal waveform ac signal, square waveform ac signal, triangular waveform ac signal or zigzag ac signal.Other composition is identical with embodiment one with annexation.
Embodiment three: be described see Fig. 1, Fig. 2, Fig. 3, the difference of present embodiment and embodiment one is that the internal thread 1-3 of the basal body of nut 1 of described cantilever beam state and the external screw thread of screw rod 1-1 can be trapezoidal thread, triangle thread, rectangular thread, saw-tooth thread, gas thread or nonstandard screw thread.Other composition is identical with embodiment one with annexation.
Operation principle: Unlockable nut mainly can encouraging Unlockable nut can be in the micro breadth oscillation state of high-frequency (frequency is generally greater than 1000Hz) by piezoelectricity stretchable sheet 2-1 of sandwich type cantilever beam flexural vibrations mode of operation, the antifriction effect that utilizes dither to produce reduces can coefficient of friction between Unlockable nut and screw rod, destroy the condition of self-locking between screw thread pair, make Unlockable nut to be in unblock operating state.The ultrasonic antifriction effect caused by the micro breadth oscillation of (frequency is generally greater than 13kHz) in supersonic frequency is the one in the antifriction effect of dither, mainly refer to when two kinematic pairs are in Frotteurism, make wherein one or two contact surface be in ultrasonic vibration state by the applying of ultrasonic vibration and cause the phenomenon that between contact-making surface, coefficient of friction reduces, at present this phenomenon confirm by a large amount of experimental studies, this principle of antifriction effect that the present invention mainly utilizes dither to produce carries out work.Generation motion row ripple can superposed in screw thread pair surface between Unlockable nut with screw rod by the mode of vibration coupling simultaneously, this motion row ripple may further be Unlockable nut and screw rod can provide relative motion or movement tendency, and therefore can better realize can the self-locking of Unlockable nut and the switch and control unlocking two kinds of operating states.
Unlockable nut mainly can utilizing and the first rank flexural vibration mode in the axial direction of Unlockable nut can carry out work of sandwich type cantilever beam flexural vibrations mode of operation.Can Unlockable nut when being in the first rank flexural vibration mode, it shows as is the flexural vibrations distortion on the first rank in the axial direction.Described piezoelectricity stretchable sheet 2-1 replaceable one-tenth magnetostriction sheet, photo-induced telescopic sheet or thermic stretchable sheet.
Claims (2)
1. sandwich type cantilever beam flexural vibrations mode of operation can Unlockable nut, it is made up of the basal body of nut (1) of cantilever beam state, the piezoelectricity annulus (2) that stretches;
The basal body of nut (1) of cantilever beam state is cantilever beam the way of restraint, the basal body of nut (1) of cantilever beam state is T-shaped project organization, and its T-shaped larger diameter end adopts cantilever beam the way of restraint and is processed with several for installing fixing location hole (1-2); The piezoelectricity annulus (2) that stretches is made up of multi-disc piezoelectricity stretchable sheet (2-1), and multi-disc piezoelectricity stretchable sheet (2-1) superposes connection successively, and all piezoelectricity stretchable sheets (2-1) are annulus pad shape; The stretch type of drive of annulus (2) of described piezoelectricity is row wave excitation mode of operation or standing wave exciting mode of operation; In row wave excitation mode of operation, the driving phase difference 90 degree of the piezoelectricity stretchable sheet (2-1) of adjacent sets; The driving electric signal waveform of piezoelectricity stretchable sheet (2-1) can be sinusoidal waveform ac signal, square waveform ac signal, triangular waveform ac signal or zigzag ac signal; The periphery that it is characterized in that the T-shaped minor diameter of the basal body of nut (1) of cantilever beam state has one week annular groove (1-4), the piezoelectricity annulus (2) that stretches is embedded in the annular groove (1-4) of the basal body of nut (1) of cantilever beam state, and the stretch both sides end face of annulus (2) of piezoelectricity is connected with the both sides end face in annular groove (1-4) respectively; The inner headed face of the basal body of nut (1) of cantilever beam state is provided with internal thread (1-3), be rotatably connected in the internal thread (1-3) of the basal body of nut (1) of cantilever beam state screw rod (1-1), and the lead angle of internal thread (1-3) is less than the equivalent friction angle between internal thread (1-3) and screw rod (1-1) connecting thread pair; Piezoelectricity stretchable sheet (2-1) be circumferentially provided with two fan-shaped polarized areas (2-2) and two fan-shaped insulation isolated areas (2-3), two fan-shaped polarized areas (2-2) are arranged with two spaced contiguous circumferential of fan-shaped insulation isolated areas (2-3) difference, the telescopic direction of two fan-shaped polarized areas (2-2) of piezoelectricity stretchable sheet (2-1) is identical with the thickness direction of piezoelectricity stretchable sheet (2-1), the driving phase difference 180 degree of the adjacent fan-shaped polarized area (2-2) on each piezoelectricity stretchable sheet (2-1); Row wave excitation mode of operation is the multi-disc piezoelectricity stretchable sheet (2-1) that stretches in annulus (2) of described piezoelectricity for two panels becomes one group, often in group, the fan-shaped polarized area (2-2) of two panels piezoelectricity stretchable sheet (2-1) faces with fan-shaped polarized area (2-2), and their driving phase place is identical; Fan-shaped polarized area (2-2) between adjacent sets and fan-shaped insulation isolated area (2-3) face; Standing wave exciting mode of operation is one group and drives separately, and often in group, the fan-shaped polarized area (2-2) of two panels piezoelectricity stretchable sheet (2-1) faces with fan-shaped polarized area (2-2), and their driving phase place is identical; The resonance frequency of the driving frequency of described piezoelectricity stretchable sheet (2-1) and the basal body of nut (1) of cantilever beam state is close, excites the basal body of nut of cantilever beam state (1) to be in ultrasonic vibration state with this.
2. sandwich type cantilever beam flexural vibrations mode of operation according to claim 1 can Unlockable nut, it is characterized in that the internal thread (1-3) of the basal body of nut (1) of described cantilever beam state and the external screw thread of screw rod (1-1) can be trapezoidal thread, triangle thread, rectangular thread, saw-tooth thread, gas thread or nonstandard screw thread.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310078046.0A CN103174724B (en) | 2013-03-12 | 2013-03-12 | Releasable nut in sandwich type cantilever beam bending vibration working pattern |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310078046.0A CN103174724B (en) | 2013-03-12 | 2013-03-12 | Releasable nut in sandwich type cantilever beam bending vibration working pattern |
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| CN103174724A CN103174724A (en) | 2013-06-26 |
| CN103174724B true CN103174724B (en) | 2015-03-18 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105322825A (en) * | 2015-01-06 | 2016-02-10 | 长春工业大学 | Longitudinal vibration sandwich beam and plate complex excitation ultrasonic motor, driving platform and driving method thereof |
| CN105281598A (en) * | 2015-01-06 | 2016-01-27 | 长春工业大学 | Sandwich-type mode transition ultrasonic motor, drive platform and drive method thereof |
| CN107218368B (en) * | 2017-07-25 | 2023-04-25 | 顺德职业技术学院 | Porous ultrasonic transmission pair |
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| CN201518456U (en) * | 2009-09-14 | 2010-06-30 | 缪云灼 | Mini-size rod type thread ultrasonic motor |
| CN102185519A (en) * | 2011-05-11 | 2011-09-14 | 南京航空航天大学 | Mode conversion type piezoelectric thread transmission linear ultrasonic motor |
| CN102355157A (en) * | 2011-10-10 | 2012-02-15 | 哈尔滨工业大学 | Piezoelectric plate-sandwiched rotary linear ultrasonic motor stator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3280808B2 (en) * | 1994-10-27 | 2002-05-13 | 中村 健太郎 | Ultrasonic motor |
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|---|---|---|---|---|
| CN201518456U (en) * | 2009-09-14 | 2010-06-30 | 缪云灼 | Mini-size rod type thread ultrasonic motor |
| CN102185519A (en) * | 2011-05-11 | 2011-09-14 | 南京航空航天大学 | Mode conversion type piezoelectric thread transmission linear ultrasonic motor |
| CN102355157A (en) * | 2011-10-10 | 2012-02-15 | 哈尔滨工业大学 | Piezoelectric plate-sandwiched rotary linear ultrasonic motor stator |
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| 周铁英等.螺母型超声电机驱动的集成透镜调焦系统.《中国科学E辑:技术科学》.2009,第39卷(第10期), * |
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