JP2545135Y2 - Ultrasonic motor support structure - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to an ultrasonic motor support structure for using an ultrasonic motor that generates a rotational driving force, and reduces the rotational driving force without affecting the vibration characteristics of the ultrasonic motor. Also, the present invention relates to an ultrasonic motor support structure for stably storing an ultrasonic motor.

[0002]

2. Description of the Related Art An ultrasonic motor has a very high electro-mechanical conversion efficiency, and can generate a large driving torque at a constant voltage and at a low speed. Above all, complex oscillator type ultrasonic motors that generate stable rotational torque even at low speed and are easy to control are expected to be used in various fields. FIG. 2 shows a conventional example of an ultrasonic motor supporting structure for housing the composite transducer type ultrasonic motor. The cylindrical composite transducer type ultrasonic motor 12 includes a stator in which a stator bottom 14, a torsional vibration element 16, a hold block 18, a longitudinal displacement type piezoelectric element 20, and a stator head 22 are sequentially provided on a central axis 60. It is schematically composed of a head 22 and a rotor 24 that slides. The rotor 24 is also connected to the stator at the center axis 60. The torsional vibration element 16 is a laminated piezoelectric body made of a piezoelectric material such as lead zirconate titanate or the like, and generates a rotational driving force. The vertical displacement type piezoelectric element 20 acts as a clutch when activated. The rotor 24 is pressed against the stator by a spring 26 at a constant pressure. In the composite transducer type ultrasonic motor 12 having this configuration, the applied voltage of the resonance frequency of the torsional vibration element 16 is applied to the torsional vibration element 16 and the longitudinal displacement type piezoelectric element 20, respectively. Then, torsional vibration occurs in the torsional vibration element 16 and the longitudinal displacement type piezoelectric element 20 expands and contracts. The rotor 24 can be continuously rotated in one direction by a combination of these vibrations. The ultrasonic motor support structure shown in FIG. 2 is schematically constituted by a holder 34 and a pipe 30 in addition to the ultrasonic motor 12. Spokes 28 are provided between the rotor 24 of the ultrasonic motor 12 and the pipe 30.
4 is applied to the pipe 3 through the spokes 28, 28.
Informed to 0. Further, a flange 32 is provided at a node in the torsional mode of the ultrasonic motor 12. The flange 32 is fixed to a holder 34 and supports the ultrasonic motor 12. It is essential that the flange 32 supporting the ultrasonic motor 12 be provided at a node in the torsion mode.
By providing the joint at this node, the ultrasonic motor 12 can be supported without adversely affecting the mode of the torsional vibration of the torsional vibration element 16. The node in the torsional mode generally occurs at the edge of the hold block 18 on the torsional vibration element 16 side. In the ultrasonic motor support structure having the above configuration,
When the rotor 24 of the ultrasonic motor 12 rotates, the rotational driving force is transmitted to the pipe 30 via the spoke 28, and the pipe 30 rotates. Therefore, the rotational driving force of the ultrasonic motor 12 can be used by fixing the object to be supplied with power to the pipe 30. For example, when this ultrasonic motor support structure is provided at the upper end of a window frame and used as a blind winder, one end of the blind is connected to a pipe 30.
, The blinds can be wound up with the rotation of the pipe 30.

[0003]

In the ultrasonic motor supporting structure having the above-described structure, the ultrasonic motor 12 is supported by the flange 32. Therefore, the holder 34 is increased in size in the radial direction by the provision of the flange 32. Would. Further, since the flange 32 needs to be provided at the node of the ultrasonic motor 12, the holder 34 also becomes large in the length direction in order to store the torsional vibration element 16 and the stator bottom 14. . Such an increase in the size of the holder 34 not only has a poor appearance when the ultrasonic motor is mounted, but also requires a special installation place for the ultrasonic motor, and the mounting itself is difficult, which is very inconvenient. Especially,
When used as a blind hoist, there was a gap at the side end of the blind as compared to the window frame. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an ultrasonic motor is supported and stored inside a pipe by connecting an end of a center shaft on a rotor side to a support shaft of a holder.

[0004]

SUMMARY OF THE INVENTION An ultrasonic motor supporting structure according to the present invention has an ultrasonic motor, a pipe, and a holder in which a cylindrical stator and a rotor are connected to each other on a central axis, and the ultrasonic motor is connected to a pipe. An ultrasonic motor support structure in which the end of the pipe is rotatably mounted on the holder and is formed at the end of the center axis of the ultrasonic motor on the rotor side and at the center of the bottom surface of the holder. And a rotor fixed to the inner surface of the pipe.

[0005]

In the ultrasonic motor support structure of the present invention, the end of the center axis of the ultrasonic motor on the rotor side is connected to the support shaft of the holder, so that the ultrasonic motor is supported by the holder. In the method of supporting with the center axis, the influence on the torsional vibration of the ultrasonic motor is very small. Therefore, it is necessary to provide a flange for supporting the ultrasonic motor.
Since it is unnecessary, most of the ultrasonic motor can be stored in the pipe, and the holder can be downsized.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. The cylindrical composite transducer type ultrasonic motor 56 includes a stator in which the stator bottom 14 , the torsional vibrating element 16, the hold block 18, the vertical displacement type piezoelectric element 20, and the stator head 22 are sequentially connected on the central axis 48 , and a stator. It is schematically composed of a head 22 and a rotor 24 that slides. The rotor 24 is also connected to the stator so as to be rotatable about a center shaft 48 . At the tip of the center shaft 48 on the rotor side,
Bolted through a ring 26, the rotor 24
Are pressed against the stator at a constant pressure. The torsional vibration element 16 is a laminated piezoelectric body made of a piezoelectric material such as lead zirconate titanate or the like, and generates a rotational driving force. The vertical displacement type piezoelectric element 20 acts as a clutch when activated. In the composite transducer type ultrasonic motor 56 having this configuration, the applied voltage of the resonance frequency of the torsional vibration element 16 is applied to the torsional vibration element 16 and the longitudinal displacement type piezoelectric element 20, respectively. Then, torsional vibration occurs in the torsional vibration element 16 and the longitudinal displacement type piezoelectric element 20 expands and contracts. The rotor 24 can be continuously rotated in one direction by a combination of these vibrations. Further, as shown in FIG. 1, the ultrasonic motor support structure of this, in addition to the ultrasonic motor 56, it is schematically configured from the holder 58 and the pipe 30. The pipe 30 is cylindrical and has an ultrasonic motor 5 therein.
6 is stored, and the pipe 30 itself rotates by receiving the rotational force of the ultrasonic motor 56 . The holder 58 is provided at an end of the pipe 30, and the holder 58 is fixed to a building material or the like where the ultrasonic motor is installed. Also, pipe 3
The 0 and the holder 58 slide on the sliding portions 36, 36, which are made of OILES metal or the like. Ultrasonic motor 56
Spokes 28, 28 are provided between the rotor 24 and the pipe 30.
Is provided, and the rotational force of the rotor 24 is
28 to the pipe 30. In addition, spoke 2
Numerals 8 and 28 may be of an annular shape in addition to a radial shape with the rotor 24 at the center. further,
The end of the center shaft 48 on the rotor 24 side and the support shaft 44 are connected.
Have been. The support shaft 44 at the center of the bottom surface 42 of the holder 58, one that is protruding to the ultrasonic motor 56 side, which supports the ultrasonic motor 56 by connecting the central axis 48. As described above, in the configuration in which the center shaft 48 and the holder 58 are connected, the ultrasonic motor 56 is stably supported without adversely affecting the mode of the torsional vibration and without lowering the rotational driving force. be able to. Especially,
By making the support shaft 44 thinner, the influence on the vibration characteristics of the ultrasonic motor 56 can be further reduced. Special
And a spring 2 between the holder 58 and the ultrasonic motor 56.
6 is interposed, so that the spring 26
By operation, torque loss of the ultrasonic motor 56 is further reduced.
It is a thing. In this embodiment, the support shaft 44 is used as a holder.
The support shaft 44 and the central shaft 48 are connected to each other, but the central shaft 48 is extended and the central shaft 48 is directly connected to the holder 58.
Of course, it is within the scope of the present invention even if connected.

In the ultrasonic motor supporting structure of this embodiment, when the rotor 24 of the ultrasonic motor 56 rotates, the rotational driving force is transmitted to the pipe 30 via the spoke 28, and the pipe 30 rotates. Therefore, the rotational driving force of the ultrasonic motor can be used by fixing the object to be supplied with power to the pipe 30. For example, when this ultrasonic motor support structure is installed at the upper end of a window frame and is used as a blind winder, if one end of the blind is fixed to the pipe 30, the windup of the blind is performed with the rotation of the pipe 30. Can do it.

In the ultrasonic motor supporting structure of this embodiment, unlike the conventional ultrasonic motor supporting structure, no flange is provided at the node of the mode, so that the holder 58 is not unnecessarily enlarged. That is, most of the ultrasonic motor 56 can be stored inside the pipe 30 and the holder 5
8 can be reduced in size. Therefore, the ultrasonic motor support structure of the present embodiment is easy to mount, does not have a gap or the like due to the installation of the ultrasonic motor, and has an improved appearance.

[0009]

The ultrasonic motor support structure of the present invention connects the end of the ultrasonic motor on the rotor side with respect to the center axis of the ultrasonic motor to the support shaft formed on the holder, thereby connecting the ultrasonic motor to the pipe. What to store. As in the configuration of the present invention, in the method of supporting the ultrasonic motor on the center axis,
The ultrasonic motor can be stably supported without affecting the vibration characteristics of the ultrasonic motor. Furthermore, since it is not necessary to provide a support member such as a flange on the ultrasonic motor, and most of the ultrasonic motor can be stored in the pipe, the size of the ultrasonic motor support itself can be reduced. In addition, the installation place at the time of installation can be reduced. Furthermore, attachment itself becomes easy. Also, the appearance is significantly improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an ultrasonic motor support structure according to an embodiment.

FIG. 2 is a side sectional view of a conventional ultrasonic motor support structure.

[Explanation of symbols]

 12 Ultrasonic Motor 14 Stator Bottom 16 Torsional Vibration Element 18 Hold Block 20 Vertical Displacement Piezoelectric Element 22 Stator Head 24 Rotor 28 Spoke 30 Pipe 32 Flange 34 Holder 42 Bottom Surface 44 Support Shaft 48 Center Shaft 56 Ultrasonic Motor 58 Holder 60 Center axis

Claims (1)

(57) [Scope of request for utility model registration] 1. An ultrasonic motor comprising a cylindrical stator and a rotor connected to each other on a central axis, a pipe and a holder, wherein the ultrasonic motor is housed inside the pipe and an end of the pipe is rotated by the holder. An ultrasonic motor support structure that is freely mounted, wherein an end of the center shaft on the rotor side is connected to a support shaft formed at the center of the bottom surface of the holder, and the rotor is fixed to the inner surface of the pipe. An ultrasonic motor support structure, comprising: