JPS60152273A - Vibration piece type supersonic motor - Google Patents

Abstract

PURPOSE:To facilitate rotation switching in normal and reverse directions by switching the vibration transmission of the first and second toothed vibrators of opposite inclinations and outer and inner rotors. CONSTITUTION:When an outer rotor 6 is contacted with the first toothed vibration piece 4a, the rotor 6 is applied with a unidirectional rotary force through the first piece 4a by the vibration of a supersonic vibrator 3. The rotary force of the rotor 6 is transmitted through an interlocking member 16, and arm 17 to an output shaft 18. In order to reversely rotate the output shaft 18, the yoke rod 5 and the yoke terminal board 15 are approached by the magnetic action of an electromagnetic coil 13, the rod 5 and the terminal board 15. In other words, the second toothed vibration piece 4b and an inner rotor 7 are contacted. Since the second piece 4b is mounted in reverse direction of the mounting angle from the first piece 4a, the rotor 7 is rotated reversely to the rotor 6, and the rotation is transmitted to the shaft 18.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a vibrating piece type ultrasonic motor suitable for small clutches and small motors.

[Prior art]

Vibrating element type ultrasonic motors, which convert the vibrations of an ultrasonic vibrator into rotational force via vibrating elements, have been known for a long time, and they are small, have high output and high rotational characteristics, and have a structure based on Dutch studies. , it has been desired to put it into practical use because of its low noise and easy rotation control advantages.

However, the conventional vibrating piece type ultrasonic motor has a problem in that it can only be driven in one direction due to its structure.

〔the purpose〕

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of conventional devices and provide a vibrating piece type ultrasonic motor capable of forward and reverse rotation.

〔composition〕

Hereinafter, the structure of the present invention will be explained based on two examples.

A vibrating body 4 having a first tooth-like vibrating piece 4a and a second tooth-like vibrating piece 4b is provided on the side of an ultrasonic vibrator 3 in which a piezoelectric vibrator 2 is sandwiched between elastic bodies 1a and lb. . This vibrating body 4
As shown in Figure 2 (a) and Figure 2 (bl), -
A group of first tooth-like vibrating pieces 4a and a group of second tooth-like vibrating pieces 4b are formed so as to be inclined oppositely to each other at substantially equal intervals on the sides, and a central recess is formed. A yoke rod 5 is provided in a protruding position. Furthermore, on the side of the vibrating body 4, an outer rotor 6 that can come into contact with the first tooth-shaped vibrating piece 4a and an inner rotor 7 that can come into contact with the second tooth-like vibrating piece 4b are arranged on the axis of each other. It is arranged so that it can slide in the direction and rotate as a unit. That is, the inner rotor 7 is rotatable and slidable relative to the yoke rod 5 via a bearing 8 and an electromagnetic coil body 9, which will be described later. A groove 10 is formed. Then, the plurality of protrusions 11 formed inside the outer rotor 6 are loosely fitted. The electromagnetic coil body 9 is fixed between the bearing 8 and the inner rotor 7, and has an electromagnetic coil 13 wound around a bobbin 12.
The slip rings 13a, 13b provided at the side ends of 2 are connected to the electromagnetic coil 13, and the slip rings 13a, 1
A pair of brushes 14 electrically connected to an external power source at 3 b.
By making contact with a, 14b, the electromagnetic coil 13 and an external power source are electrically connected. Further, a yoke end plate 15 is fixed inside the inner rotor 7 so as to face the end of the yoke rod 5.

Furthermore, the end portions of interlocking members 16 of both rotors 6.7 are fixed to the right end portions of the inner rotor 7 and outer rotor 6. This interlocking member 16 is made by bending a soft alloy rod 16a into an LJ shape and winding a coil spring 16b around it, and is fixed at several locations around both rotors 6.7.
17) to an output shaft 18, which will be described later. Therefore, when the inner rotor 7 moves to the right,
The outer rotor 6 is pressed by the connecting member 16 and moves to the left, and when the inner rotor 7 suddenly moves to the left, the outer rotor 6 is pulled by the connecting member 16 and moves to the right.

Further, the aforementioned output shaft 18 is rotatable in a cousing 19 via a bearing 20, and one end is slidably fitted into the inner rotor 7. Further, reference numeral 21 denotes a return spring that presses the inner rotor 7 leftward and returns the inner rotor 7, and its end portion is fixed to the output shaft 18.

Note that 22 is a power source connected to the electrodes 2a and 2b of the piezoelectric vibrator 2.

Therefore, the above-mentioned yoke rod 5. Electromagnetic devices such as the electromagnetic coil body 9° yoke end plate 15, and the connecting member 16 connect the two rotors 6. This serves as a switching means 23 that brings either of the second tooth-shaped vibrating pieces 4a, 4b into contact.

That is, in the state shown in FIG. 1, the outer rotor 6 and the first
The first toothed vibrating piece 4a contacts the first toothed vibrating piece 4a, and the vibration of the ultrasonic vibrator 3 applies a rotational force in one direction to the outer rotor 6 via the first toothed vibrating piece 4a. The rotational force of the outer rotor 6 is transmitted to the output shaft 7 via the interlocking member 16 and the arm 17.
18, and the rotational force in one direction is guided to the outside.

When the outer rotor 6 is rotating, the inner rotor 7 is also rotating at the same time.

Therefore, in order to rotate the output shaft 18 in the opposite direction to the above-mentioned rotation, the electromagnetic coil 13 is connected to the yoke rod 5. The yoke rod 5 and the yoke end plate 15 are brought close to each other by magnetic action with the yoke end plate 15.

That is, by applying a force to move the inner rotor 7 to the left, the second toothed vibrating piece 4b and the inner rotor 7
I will give you a portrait. Then, the outer rotor 6 is pulled by the interlocking member 16 and moves to the right, separating from the first tooth-shaped vibrating piece 4a. Since the second toothed vibrating piece 4b has a travel angle opposite to that of the first toothed vibrating piece 4a, the inner rotor 7 begins to rotate in the opposite direction to the outer rotor 6. Become. This 70 rotations of the inner lock is caused by the interlocking member 16. It is transmitted to the output shaft 18 via the arm i'y.

Furthermore, returning the actor rotor 6 to the rotational direction described above can be done by adding a long sword that separates the electromagnetic coil 13 from the yoke rod 5 and the yoke plate 15.
This can be easily achieved by bringing the inner rotor 7 and the second toothed vibrating piece 4b into contact with each other, and separating the inner rotor 7 and the second toothed vibrating piece 4b by means of the interlocking member 16.

Incidentally, both the rotors 6.7, the first toothed vibrating piece 4a and the second
Various types of switching with the toothed vibrating piece 4b can be considered, and are not limited to the embodiment of the switching means 23 described above.

〔effect〕

As explained above, in the present invention, the first
．． By switching vibration transmission between the second toothed vibrator, the outer rotor, and the inner rotor, it is possible to provide a vibrating piece type ultrasonic morph that can easily switch rotation between forward and reverse directions.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a sectional view, FIG. 2(a) is a front view of the vibrating body, and FIG. 2(b) is a partially enlarged side view of the vibrating body. FIG. 3 is a sectional view taken along the line A-A in FIG. 1 showing the relationship between the inner rotor and the outer rotor. 2... Piezoelectric vibrator, 4a... First tooth-like vibrating piece, 4b... Second tooth-like vibrating piece, 6...
...Outer rotor, 7...Inner rotor,
18...Output shaft, 23...Switching means. Figure 2 m3 diagram (b)

Claims (1)

[Claims] A piezoelectric vibrator that expands and contracts in the thickness direction when voltage is applied,
an actor rotor that can mutually slide in the axial direction and rotate together, an inner rotor, and the piezoelectric vibrator,
A first tooth-like vibrating piece and a second tooth-like vibrating piece, which are formed with opposite inclinations, transmit vibration to either the outer rotor or the inner rotor; A vibrating piece type ultrasonic motor comprising a toothed vibrating piece, a switching bending means for switching vibration transmission between the outer rotor and the inner rotor, and an output shaft provided on either the outer rotor or the inner rotor.