JPS60148388A - Supersonic vibrator of twisting mode - Google Patents

Abstract

PURPOSE:To efficiently generate a strong and stable twisting vibration by integrally coupling a piezoelectric thickness vibrator, a vertical resonator, a twisting coupler and a twisting mode resonator. CONSTITUTION:A vertical mode resonator 2 of cylindrical aluminum, a twisting coupler 3 having 8 twisting teeth on the peripheral surface near one opening of a cylindrical aluminum pipe, and a twisting resonator 4 of trapezoidal shape in the longitudinal section are superposed on thickness vibrators 11, 12. A stainless steel washer 5 is contacted with the other end face side of the vibrator 11, a hexagonal cap bolt 6 is passed through its central hole, engaged with threaded hole opened at the central hole of the upper surface of the resonator 4, and clamped by the bolt 6. A high frequency voltage is applied to lead wirings 7, 8 soldered to terminal boards 91, 92 to excite the vibrators 11, 12. Then, the vibration of twisting mode is generated at the outside end face of the resonator 4.

Description

[Detailed Description of the Invention] [Technical Field/Object of the Invention] The present invention comprises 1. : The purpose of the present invention is to provide an ultrasonic vibrator that can efficiently generate stable torsional vibrations using a straining force, in relation to the improvement of an ultrasonic vibrator in a strain mode.

[Background technology]

Ultrasonic vibration in conventional torsion mode! 1III has been used in ultrasonic machining technology, but unlike the vertical vibration, the torsional 4HP vibrator is not well known. Usually, a plurality of pieces are attached at right angles around the body to generate torsion σI. Therefore, the vibration system is complicated and cannot be assembled compactly, resulting in low efficiency and poor usability.

Therefore, the emergence of an ultrasonic vibrator that generates torsional mode vibration itself was expected, but recently piezoelectric motors have been proposed and their practical application has been tested. It is said to be a key device for practical use in motors. , [Summary of the Invention] This invention solves the above-mentioned drawbacks of the prior art.
The object is achieved by a torsional mode ultrasonic vibrator characterized by integrally connecting a piezoelectric thickness vibrator, a longitudinal mode resonator, a torsional coupler, and a torsional mode resonator. Embodiments of the present invention will be described below with reference to the drawings.

〔Example〕

Embodiment 1 FIG. 1 shows an embodiment of the torsional mode ultrasonic transducer of the present invention. 1. ．． 12 is Noah size 2, inner diameter 1
It is a doughnut-shaped thickness vibrator made of Pb(Zr'rt)03 piezoelectric ceramic having a diameter of 5 mm and an outer diameter of 35+ mm, and is coated with silver electrodes on both sides and polarized with 1-. 2
The polarized side electrodes of the vibrators 11 and 12 are opposed to each other, and a donut-shaped phosphor bronze plate 9 with a thickness of 0.2 mm and an inner diameter of 15 mm and an outer diameter of 35 mm is sandwiched between them.

For this thickness vibrator 11.12, the outer diameter is 35 mm and the inner diameter is 151 mm.
Il, cylindrical aluminum vertical mode resonator 2 with thickness 20 mm, outer diameter 35 * + x, , inner diameter 17 ml +
Twisted connector 3 with eight torsion teeth on the circumference near one opening of a cylindrical aluminum pipe with length 13
The longitudinal section is trapezoidal, the diameter of the upper mi is 35 mm, the diameter of the lower surface is 50 mm, the height is 55 mm, and the wall thickness is 7 yn+.
ll torsional resonators 4 are overlapped. And specific gravity thickness oscillator 1
A stainless steel washer 5 with an outer diameter of 35 mm and a height of 15 mm is brought into contact with the other end surface of 1, and a stainless steel washer 5 with a diameter of 10 FM and a length of 65 mm is inserted into the center hole of
+lIn hexagonal cap bolt 6 and torsion resonator 4.
Screw it into the threaded hole drilled in the center of the top of the
Then, by tightening the bolts 6 with a force of 1-l on the order of p, a torsional mode ultrasonic transducer in which all the above-mentioned parts were connected together was assembled.

To excite the vibrator 11, 12, use the phosphor bronze terminal plate 9.
．． ．． Applying a high frequency voltage around 30+<bg to the lead wires 7 and 8 soldered to 92, and guiding it to a resonant hearing while adjusting the frequency to 4::l, the twisting resonance outside Tatsuko 4 (U11) Torsional mode vibration occurs.
Off in the direction along the length of kma bolt 6! At the same time, an elliptical motion 10 is performed which is a combination of torsional vibrations with the bolt 6 as the rotation axis. Of course, the principal axis of this 411 yen is within a cylindrical plane that is concentric with the circumferential surface of the torsional resonator 40.

In addition, in this torsional mode ultrasonic vibrator, the torsion coupler that changes the thickness vibration into torsional vibration can be made by the method □ as shown in FIG.

At first, as shown in Figure 2 (α), two cylinders 12°14
are connected by eight plates 13 arranged radially.

Here, the cylinder 12.14 has an outside g 35 vnn and an inside diameter of 1
7 questions.

Length: 12 mm, Board 13: Width: 8 w, Length: 16.5 mm,
The thickness is between 2 and 3. Eight plates 13 are arranged radially as shown in FIG. 2(h), and the two cylinders 12, 14 and the plates 13 are integrated. Next, by twisting and deforming the cylinders 12 and 14 around their central axes, the shape shown in the figure (C) is obtained.Then, by cutting the cylinders 12 and 14 into two parts by cutting along the center plane, the shape shown in the figure (C) is obtained.
A torsion connector with radial teeth on the end face of the cylinder 12 shown in (d,') is completed.

A torsional connector is an element that generates torsional displacement around the axis when a compressive force is applied in the axial direction, converting vertical vibration into torsional vibration. The torsional resonator 4 receives the torsional torque of the torsional coupler 3, and
This is an element that resonates with the torsional vibration of the pipe and amplifies the torsional amplitude, and the resonant frequency is determined by the length of the pipe. Here, a pipe with a length of 65 mm was used, so it resonated at 31.5 Kl-Ly.

When these parts are combined to assemble a torsion mode ultrasonic transducer, it will have the shape shown in Figure 1, and the lead wire 7
and a sinusoidal voltage of 31.5 K1-1g between 1 and 8
When approximately 0 volts are applied, an inertial motion yb as shown by the arrow 10 occurs on the end face. Note that the same result can be obtained even if the vertical vibrator 2 and the torsional resonator 3 are integrally formed, or the torsional resonator 4 and the torsional ring 13 are integrally formed. Note that the number of plates in the twister 13 was 8 in the above embodiment, but
The number of chisels is not limited to eight, but the appropriate number of chisels fZ is selected depending on the thickness and length of the board from the balance of strength of torsional deformation and compressive deformation.

Example 2 The only difference is the height of the torsional resonator 4 from 55 in Example 1, which is 65.
When an ultrasonic transducer with the same torsion mode as in Example 1 was made using vrg and excited with a sinusoidal voltage of 2 G, 4 KN, and 9, the end face of the resonator 4 as shown in Fig. 3 was created. (=Bending vibration 4' with distorted third-order spreading mode occurred on the cylindrical surface near J. The vibration node 20 is located at C6 along the circumference of the cylinder.
Appears in six equal parts [σ] of 0°, and the vibrations have opposite phases in each division, and are considered to be standing waves with a wave number of 3. Since the positions of the nodes and antinodes of the vibration are constant, it is probably a standing wave, but perhaps because it is distorted, the antinodes move in an ellipse 30 near one of the nodes rather than between the %I and nodes.

For this reason, if the rotating shaft of a cylindrical rotor is twisted around the outer or inner periphery and pressed into contact with the axis of the resonator in 316 rows, it will rotate at a fairly high speed, but the position of the tangent line between the rotor and the resonator will be the same as the 1st circle. When moved along the circumference, it rotates in the opposite direction every 600 degrees.

As explained above, in the torsional mode ultrasonic vibrator of the present invention, elliptic motion can be caused at a fixed position of the torsional resonator. Note that since the wave number of this elliptical motion changes depending on the diameter of the resonator and the thickness of the resonator, it can be set i1 arbitrarily.

Example 3 In Examples 1 and 2, the torsion mode ultrasonic transducer of the present invention was explained by giving an example, but in order to generate the torsion mode, the resonator must have a vibration I circuit. No. Since the frequency of torsional resonance is determined by the length of the pipe, a pipe shorter than a predetermined length cannot be used to generate the necessary vibration. This is disadvantageous in reducing the size of the vibrator, and a more compact convex vibrator that solves this drawback is shown in FIG.

- The torsion resonator 24 is a cylinder with an outer diameter of 55 mm, an inner diameter of 41 mm, and a length of 75 mF, with one end open and the other end I'tiM connected for 7 hours.
'The bottom of the sky is on. #L Jrj inside this jab
! Torsion connector 23 integrated with 1tII element and pressure 11J
, ceramic vibrator 21゜22 and stainless steel washer 2
5 were tightly tightened to the inner surface of the resonator 24 through canog bolts 26. In addition, 27.2
8 is a lead wire. The torsional mode ultrasonic transducer thus produced performs the same function as the transducer shown in FIG. 1, but its length can be reduced to about half, making it useful for miniaturization.

The torsional mode ultrasonic transducer explained above is ■Jfhi
To make the end face of the mover undergo torsional vibration uniformly and coaxially with the axis of the resonator, ■ To parasitize vertical vibration to this torsion and cause the end face to move in an elliptical rather than a simple twist, however, the axis of rotation of the ellipse is not torsional. In the radial direction in the plane perpendicular to the axis, ■Create a standing wave with a wave number in the resonator, and interlock the 1'1st circle with the opposite phase of the adjacent comrades that divide the periphery of the cylinder into 2. However, the rotation axis of the circle is ]:3
It is possible to vibrate in three modes parallel to the axis. These are basic modes, but when they are combined, complex asymmetric imaging occurs, for example, the recess and the outer peripheral surface of the resonator form an ellipse whose axis of rotation is the tangent to the cylindrical surface within a plane obtained by slicing the cylinder. I'm happy to see exercise etc.

〔Effect of the invention〕

As explained above, since the 14L thickness vibrator, vertical mode resonator, torsional coupler, and torsional mode resonator are connected together, the ultrasonic wave has a new function that is compact, efficient, and generates strong torsional vibration. It is possible to realize a torsion oscillator, and since it is integrated, it is easy to use and has the effect of miniaturization.

In addition, when the ultrasonic four-axis rotor of the present invention in torsion mode is used in a pressure tortoise motor, the thickness and wear can be reduced because the friction surface can be made wider.

When the rotor contacts and slides around the outer periphery of the cylindrical vibrator, the contact position can be shifted by half a wavelength to form a motor capable of rotating. Or flat water.

There are effects such as being able to move the straight 4' in one direction by bringing a rod or the like into contact with it.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the torsional mode ultrasonic transducer of the present invention, and FIGS. 2(a), (h), (C1
, (d) is used for the torsional mode ultrasonic transducer of the present invention (・
Figure 3 is an explanatory diagram of the movement of the end face of the ultrasonic transducer in torsion mode of the present invention.
The figure is a sectional view showing another embodiment of the torsion mode ultrasonic four-axis rotor of the present invention.

Claims (1)

[Scope of Claims] 1. A torsional mode ultrasonic transducer characterized by integrally connecting a piezoelectric thickness vibrator, a longitudinal mode resonator, a torsional coupling element, and a torsional mode resonator. 2. In claim 1, one end surface of the vibrator is composed of a free vibration end of a cylindrical torsional mode resonator,
As a result of the longitudinal vibration along the axis as well as the vertical vibration around the axis of the cylinder, the locus of vibration at the point of failure of 9+la improvement is uniformly within the curved cylindrical surface having an axis concentric with the outer circumferential surface of the cylinder. An ultrasonic transducer characterized in that it is capable of exciting a mode of elliptical motion having a principal axis at . 3. In claim 1, one end surface of the vibrator consists of a free vibration end of a cylindrical torsional mode resonator,
By parasiticizing the torsional vibration fiJ11 with a radial vibration having a wave number of 2 or more on the circumference of the cylinder, the locus of vibration at a point on the end face becomes an elliptical motion with its principal axis in a plane perpendicular to the axis of the cylinder. An ultrasonic transducer υ which is capable of exciting a standing wave of the above-mentioned wave number.