JPH05176560A - Manufacture of ultrasonic wave driving motor lining material and ultrasonic wave motor employing the lining material - Google Patents

Abstract

PURPOSE:To obtain a lining material which has excellent abrasion resistance and facilitates reduction of noises by a method wherein a plurality of plate- shaped elements are laminated and the laminated member is cut out with a required thickness along a direction other than the direction of the surface. CONSTITUTION:A plurality of plate-shaped elements 21 are laminated from a direction A. Then a block-shaped laminated member 20 is cut along a direction having an angle theta against the direction of lamination to cut out a board having a required thickness (t) and the board is processed into a disc-shaped lining material 9 having a hole at its center. Therefore, regions a', b' and c' are evenly exposed in a C-plane or a D-plane which is to be a contact plane with a stator part 1, so that the component elements of the lining material 9 can be uniformly arranged. Further, as the block-shaped laminated member 20 composed of a required number of the plate-shaped elements 21 is cut along the direction having an angle other than 90 degrees against the direction of lamination, abrasion resistance, vibration-proofness, impact resistance and heat resistance are improved and, further, creation of noises is suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lining material used for an ultrasonic drive motor or the like which causes an elastic body to resonate using ultrasonic vibration as a drive source and converts the resonant motion into rotational motion.

[0002]

2. Description of the Related Art Conventionally, a piezoelectric body drive motor, which is a so-called ultrasonic drive motor, which utilizes a vibration of a piezoelectric body as an exciting portion to cause resonance in a solid body and converts the vibration into a rotational movement, has a large simplicity. It is a feature and is expected to be widely applied to electronic devices, cameras, medical devices, etc.
However, since the ultrasonic drive motor uses ultrasonic vibration after converting it into rotational motion or the like, friction between two types of contacting media is inevitably generated in the conversion part from the vibrational motion to the rotational motion or the like. In order to prevent abrasion of the medium and noise due to friction, a lining material (Japanese Patent Laid-Open No. 62-23379) in which a felt of a heat-resistant organic material is impregnated with a thermosetting resin and cured on a sliding surface, or an aromatic polyamide is used as a rubber matrix. Lining material in which fibers and inorganic filler are dispersed (Japanese Patent Laid-Open No. 62-23538).
No. 5) has been proposed.

The material of the lining material is composed of a material having excellent wear resistance, a material having excellent vibration resistance, a material having excellent sliding resistance, a material having excellent heat resistance, etc. For example, in JP-A-1-26375, a lining material has been proposed which comprises meta-type wholly aromatic polyamide particles and meta-type wholly aromatic polyamide fibers as main components, and heat-compression-molds a compounded material. There is.

The shape of the lining material formed of the above materials is, for example, a disk shape as shown in FIG.

[0005]

However, the lining material formed as described above has, for example, three regions a, b, and c in the thickness direction as shown in FIG.
It is difficult to make each region into a material having uniform properties. When this lining material is processed to ensure the accuracy as a sliding surface, it is not possible to determine which area of a, b, or c is the surface that can be the contact surface with the stator portion, and the stator portion of the lining material cannot be determined. The performance of the material is influenced by the configuration state of the material that appears on the contact surface with, and there is a problem in that high torque and high speed ultrasonic drive motors are greatly worn and generate noise.

In view of the above problems of the prior art, the present invention provides a method of manufacturing a lining material which is excellent in wear resistance and significantly reduces noise generation in a high torque and high speed type ultrasonic drive motor. The purpose is to do.

[0007]

The present invention relates to a method of manufacturing a lining material used for an ultrasonic wave driving motor, in which a step of laminating a plurality of plate-like materials and the laminated member formed into a plate A method of manufacturing a lining material for an ultrasonic drive motor, comprising a step of cutting to a predetermined thickness in a direction other than the surface direction of the material.

[0008]

According to the present invention, a plurality of plate-shaped materials are laminated and the lining material for an ultrasonic wave driving motor is cut out from the laminated members in a direction other than the plane direction of the plate-shaped material to a predetermined thickness. As a result, it has excellent wear resistance and can significantly reduce noise generation.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing its embodiments.

FIG. 1 is a sectional view of an ultrasonic drive motor showing an embodiment according to the present invention. That is, the ultrasonic drive motor is generally composed of a stator portion 1 on the side fixed to a base and the like, and a rotor portion 2 on the side to which rotation is applied.

The stator portion 1 is a piezoelectric body 3 serving as an exciting portion supported by a stator support portion 6 provided on the inner and outer circumferences of the stator fixing base 7, and is bonded to the piezoelectric body 3 to form iron or iron. The driving body 4 is made of another metal material and has a protruding vibration amplification section 5.

On the other hand, the rotor portion 2 is constituted by a disk-shaped rotor body having a groove in a portion where the vibration amplification portion 5 acts, and a shaft 8 which is a rotary shaft integrated with the rotor body. A lining material 9 in which a plurality of materials are laminated in the surface direction as shown in FIG. 6A, which is in contact with the vibration amplification section 5, is fixed to the groove by an adhesive sheet or the like (see FIG. 4). .. The shaft 8 is held by the stator portion 1 via a bearing 10, and the end portion of the shaft 8 is formed by a bolt portion (see FIG. 4) so that the lining material 9 and the vibration amplification portion 5 are brought into contact with each other at a predetermined pressure. Further, the nut 11 is screwed into the bolt portion via the disc spring 12.

Next, the operation principle of the ultrasonic drive motor configured as described above will be described.

Now, the piezoelectric body 3 is polarized into N pieces in the circumferential direction and positive and negative electric fields are applied to adjacent electrodes, respectively, so that the piezoelectric body 3 and the driving body 4 are bonded to each other as shown in FIG. The ring-shaped maximum deforming portion located at a constant radius from the center of the partial disk is a protrusion provided on the maximum deforming portion of the driving body 4 because the entire ring vibrates and vibrates as shown in FIG. The vibration amplification section 5 is vibrated. The vibration of the vibration amplification unit 5 has vibration components in the axial direction and the circumferential direction.
The respective parts of generate vibrations that describe an elliptical locus. At this time, when the vibration amplification section 5 is brought into contact with the lining material 9 provided in the groove of the rotor section 2, the rotor section 2 absorbs the vibration of the axial component and is driven and rotated in one direction by the vibration of the circumferential component. .. An ultrasonic drive motor is realized by extracting the rotation of the rotor unit 2 to the outside.

The present invention has found that in such an ultrasonic drive motor, the configuration state of the surface where the vibration amplification portion 5 of the stator portion 1 contacts the lining material 9, that is, the sliding surface is important. The present invention provides a method for producing a lining material that is excellent in wear resistance, vibration resistance, sliding resistance, and heat resistance, and that suppresses unnecessary vibration and significantly reduces noise generation. Will be described with reference to the drawings showing an embodiment thereof.

FIG. 5 is a perspective view of a laminated member in a step of laminating plate-shaped materials in the method for manufacturing a lining material according to one embodiment of the present invention. That is, for example, a plurality of plate-shaped raw materials 21, which are mainly composed of meta-type wholly aromatic polyamide particles and meta-type wholly aromatic polyamide fibers and which are formed by heat compression molding of a compounding material, are laminated from, for example, the A direction, The laminated block-shaped laminated members 20 are cut at a predetermined thickness t at an angle θ (an angle that is not 90 degrees) with respect to the laminating direction to cut a board. Next, the cut board is finished into a disc-shaped lining material 9 having a hole in the center as shown in FIG. As shown in FIG. 7, the lining material 9 produced as described above is formed by stacking the materials in the surface direction, and the performance of the surface in contact with the vibration amplification section 5 is averaged.

In the conventional lining material (see FIG. 8), as described above, it is necessary to create a uniform material state in the thickness direction, for example, in the regions a, b, and c, because of the difference in weight between constituent materials. It was difficult due to differences in compounding method and manufacturing conditions.

However, according to this structure, as shown in FIG. 7, the regions a ', b', and c'appear uniformly on the C surface or D surface which can be the contact surface with the stator portion 1. The constituent material of the lining material 9 is made uniform, and the characteristics of the material can be fully exhibited.

As described above, according to this embodiment, the block-shaped laminated member 2 in which a predetermined number of plate-shaped materials 21 are laminated
By cutting so that the cutting direction is an angle other than 90 degrees with respect to 0 with respect to 0, wear resistance, vibration resistance, sliding resistance, heat resistance are improved, and at the same time, The generation of noise can be reduced.

In the above embodiment, the cutting direction of the laminated member 20 was the angle θ with respect to the laminating direction.
In the direction of the surface where the lining material 9 contacts the vibration amplification section 5,
It suffices that the materials are stacked and lined up, and therefore, the cutting may be performed at an angle in a direction that is not parallel to the direction of the surface.

Further, in the above-mentioned examples, the lining material was composed of a material obtained by heat-compressing the compounded material containing the meta-type wholly aromatic polyamide particles and the meta-type wholly aromatic polyamide fiber as a main component. It is not limited to this.

[0022]

As is apparent from the above description, the present invention provides the step of laminating a plurality of plate-shaped materials and the laminated laminated members in a direction other than the plane direction of the plate-shaped material.
Since it has a process of cutting to a predetermined thickness, it improves wear resistance, vibration resistance, sliding resistance, heat resistance, and for ultrasonic drive motors that greatly reduce noise generation. It has the advantage of being able to provide lining material.

[Brief description of drawings]

FIG. 1 is an ultrasonic drive motor showing an embodiment according to the present invention.
FIG.

FIG. 2 is a sectional view showing a stationary state of a stator portion of the embodiment.

FIG. 3 is a cross-sectional view showing a vibrating state of a stator portion of the embodiment.

FIG. 4 is a sectional view showing a rotor portion of the motor.

FIG. 5 is a perspective view of a laminated member in a step of laminating plate-shaped raw materials in a method for manufacturing a lining material according to an embodiment of the present invention.

6 (a) and 6 (b) are respectively a plan view and a cross-sectional view of a lining material manufactured by the same example.

FIG. 7 is an enlarged view of a cross section of the lining material in the same example of the above figure.

8A, 8B, and 8C are a plan view, a cross-sectional view, and an enlarged cross-sectional view of a conventional lining material, respectively.

[Explanation of symbols]

 1 stator part 2 rotor part 9 lining material 20 laminated member 21 plate-shaped material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryuji Uemura 3-4-1 Mihara, Ibaraki City, Osaka Prefecture Teijin Limited Osaka Research Center

Claims (2)

[Claims] 1. A method of manufacturing a lining material used for an ultrasonic wave driving motor, wherein a step of laminating a plurality of plate-shaped materials and the laminated members laminated in a direction other than a plane direction of the plate-shaped material. And a step of cutting the lining material for an ultrasonic wave driving motor into a predetermined thickness. 2. An ultrasonic drive motor using a lining material, wherein the lining material comprises a plurality of plate-shaped materials laminated, and the laminated members are laminated in a direction other than the plane direction of the plate-shaped material. The ultrasonic drive motor is characterized by being cut into a predetermined thickness.