JPH09103083A - Piezoelectric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the speed of a piezoelectric motor by incorporating an air blower rotated together with a shaft into the piezoelectric motor, spraying air towards the central direction of the shaft from the outside of a body of revolution and bringing the inclined plane of a driving section into contact with the teeth of the body of revolution by the force of the air. SOLUTION: An air blower turned together with a shaft 4 sprays air towards the center of the shaft 4 from the outside of the air blower, the air pushes driving sections 11a, 11d, 11f, and the inclined planes of the driving sections work so as to be brought into contact with teeth. That is, a body of revolution 1 is revolved in the clockwise direction centering around the shaft 4. The air blower is also fixed onto the shaft 4 by a key 3, etc., and rotated together with the shaft 4 centering around the shaft 4. Accordingly, air is sprayed towards the center of the shaft 4 from the outside of the air blower with the revolution of the shaft 4, and force is applied to the driving sections so that the driving sections 11a, 11d, 11f are brought into contact with the teeth of the shaft 4. When rotation is started, torsion coil springs 12a, 12d, 12f are used jointly, and the driving sections are pushed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor to which a piezoelectric element is applied.

[0002]

2. Description of the Related Art Japanese Patent Application No. 7-20 is a conventional piezoelectric motor.
7269 Piezoelectric motor and its principle applied
There is a patent application, “Piezoelectric motor”, which is a patent application submitted on September 12, 2014.

[0003]

In the above-mentioned two conventional piezoelectric motors, in order to bring the slope of the drive unit into contact with the teeth of the rotating body, a force is applied to the drive unit by using a spring or a magnet.

When a spring is used, it is necessary to use a spring that moves sufficiently quickly to follow the movement of the rotating body. That is, the natural frequency of the spring must be a sufficiently large value. For example,
To design a piezoelectric motor with a rotation speed of 2000 rpm, the natural frequency of the spring needs to be about 500 Hz.

It is practically difficult to use a spring having a natural frequency of about 500 Hz because of the size of its shape, the allowable bending and the allowable stress.

[0006] Therefore, it is not easy to put a force on the drive portion by only the spring to put the 2000 rpm piezoelectric motor into practical use.

[0007]

In order to solve the above problems, the principle of rotating a rotating body is described in Japanese Patent Application No. 7-20.
7269 or Japanese Patent Application No. 7-207269, which is a patent application filed on September 12, 1995, which is the name of the invention, "piezoelectric motor", is used to apply a force to the drive unit and rotate with the rotating shaft of the rotating body. Incorporating a fan, the fan blows air or liquid to the drive unit and utilizes the force of the air or liquid.

That is, in the apparatus of claim 1, the fan rotating together with the rotary shaft blows air from the outside of the fan toward the center of the rotary shaft, and the air pushes the drive portion,
The beveled surface of the drive works to contact the teeth.

Further, in the apparatus according to the second aspect, the fan rotating together with the rotating shaft is like a pump utilizing centrifugal force,
Air or liquid is ejected from the center of the rotating shaft to the outside of the fan, the pressure of the air or liquid is increased near the outer periphery of the piezoelectric motor, and the pressure causes air or liquid to be ejected from the ejection hole of the inner wall toward the drive unit. Press the section.

As an example of claim 1, an internal front view is shown in FIG.
Shown in The side sectional view is shown in FIG. 1 is a sectional view taken along line BB in FIG. 2, and FIG. 2 is taken along line AA in FIG.
FIG.

In FIG. 1, the rotating body rotates clockwise around the rotation axis. The fan 50 is also fixed to the rotary shaft by a key or the like, and rotates together with the rotary shaft about the rotary shaft. Therefore, as the rotary shaft rotates, air is blown from the outside of the fan 50 toward the center of the rotary shaft, and a force is applied to the drive unit so that the drive unit comes into contact with the teeth of the rotating body.

In the example of FIG. 1, since there is no air force from the fan at the start of rotation, a torsion coil spring is also used to push the drive unit. An example of the torsion coil spring is shown in FIG.

As an example of claim 2, an internal front view is shown in FIG.
4 is a side sectional view and FIG. 5 is a front sectional view of the fan 20. 3 is a sectional view taken along the line DD of FIG. 4, FIG. 4 is a sectional view taken along the line CC of FIG.
FIG. 6 is a sectional view taken along line EE of FIG.

In FIG. 3, the rotating body rotates clockwise around the rotation axis. Further, the fan 20 is fixed to the rotating shaft by a key or the like and rotates together with the rotating shaft. Therefore, in FIG. 5, the rotating shaft rotates counterclockwise. By this rotation, the fan 20 pushes air outward from the center of the rotating shaft, the air collects in the groove 16 to increase the pressure, and is blown out toward the center of the rotating shaft from the discharge hole 17a formed in the inner wall 15 or the like. Press the drive.

The force of the blown air brings the drive unit into contact with the teeth of the rotating body.

In the example of FIG. 3, since there is no air force from the fan at the start of rotation, a torsion coil spring is also used to push the drive unit. An example of the torsion coil spring is the same as that shown in FIG.

In the second aspect, if a liquid such as lubricating oil is enclosed in the piezoelectric motor, the fan functions as a pump utilizing centrifugal force, and instead of air, the liquid is discharged from the discharge hole. A force can be applied to the drive unit by blowing out the liquid.

[0018]

[Function] The principle of rotating a rotating body is described in Japanese Patent Application No. 7-207.
269 or Heisei 7 applying Japanese Patent Application No. 7-207269
Based on the name of the invention, "Piezoelectric motor", which is a patent application submitted on September 12, 2012.

In order to bring the drive unit into contact with the teeth of the rotor,
The method of pushing the drive with air or liquid is a new function of the present invention.

At the initial stage of rotation, since the force of air or liquid by the fan is not sufficient, the force of the spring pushes the drive unit to bring the drive unit into contact with the teeth of the rotating body.

When the rotation speed increases and the force of air or liquid by the fan becomes sufficient, the force of the spring and the force of air or liquid are combined to push the drive unit, the load on the spring is reduced, and the characteristic of the spring is reduced. The frequency is increased, and it can be rotated at a higher rotation speed than when there is no fan.

[0022]

Embodiment An embodiment of claim 1 is shown in FIG. 1 and FIG.

The embodiment of claim 2 is shown in FIGS. 3, 4 and 5
Indicated by

[0024]

The present invention is a piezoelectric motor that rotates a rotating body by pushing the teeth of the rotating body with a drive unit having a piezoelectric element. The speed of the driving unit affects the speed of the piezoelectric motor.

If the conventional spring is the only method for applying the force to the drive unit, the speed of the piezoelectric motor cannot be increased because the natural frequency of the spring is limited.

By incorporating the fan of the present invention,
Air or liquid can increase the force applied to the drive to increase the speed of the piezoelectric motor.

[Brief description of the drawings]

FIG. 1 is a front view of the inside of a piezoelectric motor as an example of claim 1. FIG. The cross section is BB in FIG.

FIG. 2 is a side sectional view of the piezoelectric motor according to the first embodiment. The cross section is AA in FIG.

FIG. 3 is a front view of the inside of the piezoelectric motor as an example of claim 2; The cross section is DD of FIG.

FIG. 4 is a side sectional view of a piezoelectric motor as an example of claim 2; The cross section is CC of FIG.

FIG. 5 is a fan cross-sectional view of a piezoelectric motor as an example of claim 2; The cross section is EE in FIG.

FIG. 6 is an example of a torsion coil spring.

[Explanation of symbols]

1 Rotating Body 2 Outer Box 3 Key 4 Rotating Shafts 11a, 11d, 11f Drive Parts 12a, 12d, 12f Torsional Coil Springs 13a, 13f Coil Spring Stop Pins 14a, 14f Drive Unit Shafts 15 Inner Walls 16 Grooves 17a, 17b, 17c, 17d, 17e , 17f Blow-out hole 20 Fan 31 Rotating body 32 Outer box 33 Key 34 Rotating shaft 41a, 41d Drive part 42a, 42d Torsional coil spring 43a Coil spring stop pin 44a Drive part shaft 50 Fan

Claims (2)

[Claims] 1. A rotating body having teeth arranged at equal intervals on a circumference,
A plurality of driving parts using piezoelectric elements are the main parts, each driving part has an inclined surface, and the inclined surfaces are vibrated by the piezoelectric element, and the vibrating inclined surfaces are brought into contact with the teeth of the rotor to rotate the rotor. In a piezoelectric motor that rotates, a fan that rotates with the rotating shaft is built into the piezoelectric motor, and air is blown from the outside of the rotating body toward the center of the rotating shaft, and the inclined surface of the drive section is rotated by the force of the air. A piezoelectric motor device that contacts the teeth of a person. 2. A rotating body having teeth arranged at equal intervals on a circumference,
A plurality of driving parts using piezoelectric elements are the main parts, each driving part has an inclined surface, and the inclined surfaces are vibrated by the piezoelectric element, and the vibrating inclined surfaces are brought into contact with the teeth of the rotor to rotate the rotor. In a piezoelectric motor that rotates, a fan that rotates with the rotating shaft is built in the piezoelectric motor, and air is discharged from the center of the rotating shaft to the outside, or when liquid is enclosed in the piezoelectric motor, the liquid is discharged. Or, the liquid increases the pressure around the outer box, and the air or liquid blows out from the blowout hole provided in the inner wall toward the drive unit, and the force pushes the drive unit, and the slope of the drive unit becomes the teeth of the rotor. Piezoelectric motor device to contact.