JPH06327272A - Ultrasonic motor and its assembly - Google Patents

Abstract

PURPOSE:To assemble a motor efficiently and at a low cost with a small number of man-hours by press-fitting a bearing member with a flange into the hole of an end plate through a stator center hole and at the same time performing the centering of the shaft of a rotor shaft, a rear lid, and a stator. CONSTITUTION:A center hole 6c is provided at a part 6b to be fixed of a stator 6 with a loose fitting dimensions for the diameter of a bearing 7. The center hole 6c is formed with a high degree of coaxial property for the body part of a vibrator 6a of the stator 6. A hole 8b provided at the fixed part of the stator 6 of a rear lid 8 is formed with a tight fitting dimension for the diameter of the bearing 7 to press-fit the bearing 7. A flange part 7b is provided at the bearing 7 and then the bearing 7 is inserted into the center hole 6c of the stator 6 without using screws and the is press-fit into the hole 8b of the rear lid 8, thus performing coaxial positioning and fixing of the stator 6. the rear lid 8, and the bearing 7. Hence, a motor can be assembled efficiently with a small number of man-hours and at a low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an ultrasonic motor and a method of assembling the motor.

[0002]

2. Description of the Related Art The structure of the main part of a conventional ultrasonic motor will be described with reference to FIGS.

In the figure, 1 is a stator of the motor, and the stator 1 is fixed to a rear lid (end plate) of a casing (not shown) of the motor. The stator 1 is composed of a vibrating body 1A (see FIG. 10) and a vibration generating element 1f, and the vibrating body 1A is concentric with the vibrator 1a formed in a tooth shape and arranged in an annular shape. A central hole 1d (a burnt hole, that is, a hole that does not contact the rotor shaft (not shown)) and a plurality of screw through holes (clearance holes) 1e arranged in a satellite shape with respect to the central hole 1d penetrate through. A thick fixed portion 1b provided, and a thin collar portion 1c connecting the vibrator 1a and the fixed portion 1b,
Have The vibration generating element 1f (piezoelectric element) is bonded to the lower surface of the vibrator 1a, and a flexible printed circuit board 4 for connecting the element 1f to a circuit (not shown) is bonded to the lower surface of the vibration generating element 1f. Has been done.

The rear lid 2 has an annular protrusion 2a (hereinafter referred to as a stator fixing portion) 2a for press-contacting the fixed portion 1b of the stator 1 in the center thereof, and the stator fixing portion A hole 2c for press-fitting the bearing 3 and a plurality of screw holes 2b for screwing in the stator mounting screws 5 are formed through the 2a.

The fixed portion 1b of the stator 1 is placed on the stator fixing portion 2a of the rear lid 2, the screw 5 is inserted into the screw hole 1e, and the screw 5 is screwed into the screw hole 2b of the rear lid hole 2.
It is fixed to the rear lid 2 by screwing into.

[0006]

The above-mentioned conventional ultrasonic motor has the following problems.

(I) Since the stator 1 is connected to the rear lid 2 with the screw 5, the screw 5 is easily loosened by the vibration of the stator 1.

(Ii) Since a plurality of screw holes 2b must be drilled in the stator fixing portion 2a of the rear lid 2, it takes a long processing time, and the manufacturing cost is high.

(Iii) The screw tightening work for fastening the stator to the rear lid takes time, and the manufacturing cost of the screw and the parts management cost of the screw are required. Therefore, the man-hours for manufacturing the motor are large and the manufacturing efficiency is high. Is bad and hinders manufacturing cost reduction.

(Iv) Since the vibrator body 1i (see FIG. 10) of the vibrator 1A and the lower surface of the fixed portion 1g require surface accuracy, they are generally polished on the same plane. In order to mount the vibration generating element 1f and the flexible printed circuit board 4 on the lower surface of the vibrating body main body 1i, the height (axial thickness) of the stator fixing portion 2a of the rear lid 2 is the same as that of the element 1f and the flexible printed circuit board. Is abbreviated as “flexible”) 4 or more. Therefore, conventionally, the rear lid 2 is manufactured by sawing or die casting in order to increase the thickness of the stator fixing portion 2a of the rear lid 2, so that the manufacturing cost of the rear lid is very high. .

Further, in the conventional structure, since the plurality of screw holes 2b are arranged in a satellite shape outside the bearing 3, the vibrating body 1A is formed.
The fixed portion 1g of the
Since g becomes large and the size of the collar portion 1h is restricted within the limited size, it is difficult to prevent the vibration from affecting the vibration body.

(V) Since the stator 1 is simply mounted on the hatched surface of the stator fixing portion 2a of the rear lid 2, the positioning of the coaxiality of the stator 1 with respect to the inner diameter of the bearing 3 is taken into consideration. Didn't.

The object of the present invention is to solve the above-mentioned problems existing in the prior art, to enable efficient manufacturing at a lower manufacturing cost than the conventional ultrasonic motor and at a lower manufacturing cost. It is an object of the present invention to provide an improved ultrasonic motor and an assembling method that can be made smaller than a conventional motor.

[0014]

In order to solve the above-mentioned problems inherent in the prior art, the present invention is designed based on the following basic principle.

As the connecting structure for the stator and the rear lid, a connecting structure that does not use screw connection is adopted.

When the stator and the rear cover are connected, the stator, the rear cover, and the shaft hole of the bearing can be aligned at the same time.

In the above-described conventional structure, coaxial accuracy between the vibrator body 1i of the stator 1 and the shaft hole of the bearing 3 is required. In the present invention, as shown later in FIG.
The center hole 6c and the hole 8b of the rear lid 8 are centered by the bearing 7.

In the assembling method of the present invention, the three operations of sizing the inner diameter of the bearing, press-fitting the bearing into the rear lid, and fixing the stator can be performed in a single working step.

The number of necessary parts is reduced as much as possible,
Moreover, the coupling structure is such that the coupling will never loosen due to the vibration of the stator.

The necessary parts are designed so that the processing cost is as low as possible and the number of processing steps is small.

Based on the above basic policy, the improved ultrasonic motor according to the present invention has the following configuration.

(I) A center hole is provided in the fixed portion of the stator with a loose fitting dimension relative to the diameter of the bearing. The center hole is formed with a high degree of concentricity with respect to the vibrator body of the stator.

The hole provided in the stator fixing portion of the rear lid press-fits the bearing, and therefore is formed to have a tight fitting dimension with respect to the bearing diameter. A flange is provided on the bearing member, and the bearing member is press-fitted into the hole of the rear lid through the center hole of the stator to position the stator, the rear lid, and the bearing coaxially, and fix the three members.

(II) Die-cast molding or precision press working is adopted for the stator and the rear lid with as little cutting as possible, and a working method with a small number of working steps and high dimensional accuracy is selected.

[0025]

Embodiments of the present invention will be described below with reference to FIGS.

<First Embodiment> A first embodiment of the present invention will be described with reference to FIGS.

1 and 2, 6 is a stator of an ultrasonic motor, 8 is a rear cover which is an end plate of the motor, 7 is a bearing member for connecting the stator 6 and the rear cover 8, and 9 is the stator. 6 is a flexible printed circuit board that is adhered to the substrate 6.

The stator 6 includes a vibrating body 6A and the vibrating body 6A.
The ring-shaped vibration generating element 6e adhered to the lower surface of the and the sliding member 6f adhered or applied to the upper surface of the comb teeth of the vibrating body 6A.
It consists of and. The vibrating body 6A is an annular vibrator 6
a, an annular fixed portion 6b having a bearing member insertion hole 6c which has a high degree of concentricity with the vibrator main body portion 6g and is loosely fitted to the bearing diameter, and the vibrator 6a. Thin-walled collar portion 6d connecting with the fixed portion 6b
An annular vibration generating element 6e is bonded to the back surface of the vibrator 6a. Also, the vibration generating element 6e
Flexible 9 is adhered to the back surface of the.

The rear lid 8 to which the stator 6 is fixed has a cylindrical stator fixing portion 8a at a highly accurate coaxial center position with respect to its own outer diameter, and the hole 8b of the stator fixing portion 8a is Due to the press-fitting of the bearing member, the diameter is a tight fitting dimension with respect to the bearing diameter.

The bearing member 7, which serves as a connecting member for connecting the stator 6 and the rear lid 8, has a cylindrical portion 7a (or a non-flange portion) to be press-fitted into the hole 8b through the hole 6c, and the cylindrical portion 7a. A flange portion 7b projecting from the outer periphery of the upper end of the ring-shaped portion 7a, and shaft holes 7c and 7d (the shaft hole 7d rotatably supporting the rotor shaft 11) penetrating the both parts. The axial length of the cylindrical portion 7a is designed to be equal to the sum of the axial length of the fixed portion 6b of the stator 6 and the axial length of the stator fixing portion 8a of the rear lid 8.

As shown in FIG. 3, the diameter of the hole 7c on the upper side of the bearing member 7 is designed to be sufficiently larger than the outer diameter of the rotor shaft 11, and the contact portion with the rotor shaft 11 is limited to the shaft hole 7d. This reduces the friction with the rotor shaft.
Further, the flange portion 7b has a shape suitable for fixing the fixed portion of the stator 6 (the shape may be circular or square). FIG. 1 is a vertical sectional view of the ultrasonic motor having the structure of this embodiment. Show. In the figure, 10 is a rotor which is pressed against the vibrator 6a of the stator 6 by a spring 12, and 13
Is a casing of the motor, and 14 is a bearing fixed to the casing 13 to rotatably support the rotor shaft 11. The stator 6 is fixed to the rear lid 8 by a bearing member 7 which is press-fitted into the central hole 8b of the rear lid 8 through the central hole 6c of the fixed portion 6b.

The operation of attaching the stator 6 to the rear lid 8 will be described with reference to FIG.

The bearing member 7, the stator 6 and the rear lid 8 are temporarily positioned by a jig (not shown) so as to be arranged concentrically. Next, the sizing rod 15 to be inserted into the hole 7d of the bearing member 7 is inserted into the bearing member 7, and the bearing member 7 is fitted to the rod 15 while correcting the roundness and diameter of the hole 7d. The bearing member 7 is press-fitted into the hole 8b of the rear lid 8 through the hole 6c of the stator 6 by the tubular press-fitting jig 16. At this time, the cylindrical portion 7a of the bearing member 7 is inserted into the holes 6c and 8b so that the hole 6c of the stator 6, the hole 8b of the rear lid 8 and the hole 7d of the bearing member 7 are centered at the same time. become.
At this time, the flange portion 7b of the bearing member 7 is pressed against the upper surface of the fixed portion 6b of the stator 6 so that the fixed portion 6b of the stator 6 is firmly pressed against the end surface of the stator fixing portion 8a of the rear lid 8. It

When the press-fitting and fixing are completed, the sizing rod 15 is removed from the bearing, and then the bearing press-fitting jig 16 is raised.

As described above, according to the assembling method of the present invention, the following operations can be simultaneously performed by one punching.

With the sizing rod 15, the bearing member 7
Sizing work to obtain the inner diameter dimension and roundness of the inner diameter.

Press-fitting work of press-fitting the bearing 7 into the rear lid 6 by the bearing press-fitting jig 16.

The end surface of the stator fixing portion 8a serves as a reference surface for positioning the stator 6 in the axial direction, and is a surface for supporting the stator 6 in the direction orthogonal to the axis, and therefore flatness and flatness are required. Therefore, it must be molded accurately.

<Second Embodiment> FIG. 4 shows a second embodiment of the present invention. It should be noted that the components shown in FIG. 4 with the same reference numerals as those in FIG. 1 are the components already described in the embodiment of FIG.

In this embodiment, the structure of the rear lid 8 for fixing the stator 6 is different from that of the first embodiment shown in FIG. The rear lid (end plate) 8 of the motor of this embodiment is a fixed portion 6b of the stator 6.
The portion to which is pressed is not the end surface of the cylinder but the annular surface 8c.

A hole 8 opened at the center of the annular surface 8c
d is a cup-shaped portion 8e protruding from the center of the outer surface of the rear lid 8.
It is connected to the inner hole 8d. That is, the hole is a blind hole. Therefore, as described above, the bearing member 7 is provided with the hole 6c of the fixed portion 6b of the stator 6 and the cup-shaped portion 8e of the rear lid 8.
When the stator 6 is inserted and fixed by the bearing member 7, the tip of the bearing member 7 is protected from being exposed at the cup-shaped portion. Therefore, in the configuration of the present embodiment, there is no risk of dust entering the contact surface between the rotor shaft 11 and the bearing member 7, and there is also no risk of dust entering the main structural portion of the motor inside the casing 13. This cup-shaped portion is used as a lubricating oil reservoir for the bearing. In the rear lid 8 of this embodiment, since the annular surface 8c serving as the stator fixing portion is wide and the surface 8c is formed of the plate surface of the material, it is possible to form a highly accurate flat surface by press working.

<Embodiment 3> FIG. 5 shows a third embodiment of the present invention. Note that, also in this embodiment, description of the same components as those shown in FIGS. 1 and 4 will be omitted.

In the ultrasonic motor of this embodiment, the stator 6
The other member for fixing the fixed portion 6b of the casing is the casing 1
7 is an annular surface 17c protruding from the inner surface of the end plate portion 17a, and the casing 17 has a cup-shaped or pot-shaped shape integrally formed with the end plate portion 17a. Further, the cylindrical portion 7 of the bearing member 7 is projected to the outer surface of the end plate portion 17a.
A cylindrical portion 17d surrounding the outer peripheral surface of a is formed,
The hole of the cylindrical portion 17d communicates with the hole at the center of the annular surface 17c. (That is, in the configuration of the present embodiment, the bearing member 7 has the cylindrical portion 7a extending to the outside of the casing end plate portion 17a.) The tubular portion 17d projects outside the casing end plate portion 17a. It also serves as a protection member for the bearing member and also prevents oil from leaking out. Also in this embodiment, since the annular surface 17c for receiving the fixed portion 6b of the stator 6 is formed of the plate surface of the casing material, the contact surface with the fixed portion 6b can be increased and the contact surface of the contact surface can be increased. The flatness can be increased. The casing 17 of this embodiment is manufactured by deep drawing press working or die casting. In this embodiment, an L-shaped pressure contact portion 18a is formed on the outer peripheral edge of the rotor 18, and the pressure contact portion 18a is pressed against the sliding member 6f on the upper surface of the comb teeth of the vibrator 6a of the stator 6. There is. Further, in the motor of this embodiment, the disc spring (or leaf spring) 19 is used to reduce the axial length. The disc spring has a large spring constant, and the dimension in the thickness direction of the motor needs accuracy in order to obtain a predetermined pressing force. Here, in order to use the spring whose spring displacement is suppressed and keep the spring constant low, and to prevent uneven pressure distribution due to the eccentricity of the disc spring, the structure in which the dug 18b is provided in the rotor portion where the disc spring hits is adopted. There is.

Also in this embodiment, the method of connecting the stator 6, the casing end plate portion 17a and the bearing member 7 is the same as that of the above embodiment, and the cylindrical portion 7a of the bearing member 7 is inserted through the hole 6c of the stator 6. Then, it is press-fitted into the center hole of the casing end plate portion 17a and the cylindrical portion 17d, and clamped and fixed by the flange portion 7b of the bearing member 7 and the annular surface 17c of the casing end plate portion 17a. Further, in this assembling step, the bearing member 7 is connected to the hole 6c of the stator 6 and the casing end plate 17a.
The function as a centering jig for centering the cylindrical portion 17d is also the same as in the above embodiment.

When the casing 17 of this embodiment is manufactured by press working, the cylindrical portion 17d protruding outward is drawn by inserting a punch of a press upper die. Since the inner peripheral surface of 17d is formed as an upwardly expanding tapered hole by the upwardly expanding punch draft, the bearing member 7 can be easily inserted.

<Embodiment 4> FIG. 6 shows a fourth embodiment of the present invention. In the present embodiment, the fixed portion 6b of the stator 6 is adapted to be in pressure contact with the end plate portion 20a of the casing 20 through the spacer 23, and the end plate portion 2 of the casing 20 is pressed.
The structure of 0a is simpler than that of the previous embodiment.

The casing 20 is a cup type or a pan type in which the end plate portion 20a and the body portion are integrally formed.
At the center of the outer surface of 0a, a cylindrical portion 20c is provided so as to project in the same manner as the casing of the above embodiment.

In the motor of this embodiment, the work of fixing the stator 6 to the casing end plate portion 20a is almost the same as that of the above embodiment. That is, the non-flange portion (cylindrical portion) 7a of the bearing member 7 is inserted through the center hole 6c of the fixed portion 6b of the stator 6 and the center hole 20b of the casing end plate portion 20a.
The spacer 6 and the flange portion 7b of the bearing member 7 pinch the fixed portion 6b of the stator 6 to fix the stator 6 to the end plate portion 20a via the spacer 23. The inner diameter of the tubular portion 20c protruding from the outer surface of the casing end plate portion 20a is also smaller than the outer diameter of the bearing member 7 in order to press-fit the bearing member 7.

The spacer 23 may be made of a high-rigidity material such as metal or a vibration-proof material. The spacer 23 is used to provide a gap so that the vibrating stator 6 does not contact the casing end plate portion 20a.
Further, by using rubber, urethane, or the like as the material of the spacer 23, it is possible to have a function of preventing vibration and squealing at the same time. In addition, it also functions as a relief for alleviating an abnormal pressurization state of the stator 6 such as uneven pressurization.

The casing 20 of this embodiment has a shape in which the tubular portion 20c is provided on the end plate portion 20a in the same manner as in the above-mentioned embodiment, and when the casing is manufactured by press deep drawing, Since the tubular portion 20c is formed by the punch of the press upper die, the hole 20b of the tubular portion 20c becomes an upwardly widening tapered hole due to the draft of the outer surface of the punch.
It is easy to insert the bearing member 7, and at that time, the self-centering action of the bearing member can be expected.

In the motor of this embodiment, the rotor 21 is of the type in which an L-shaped press contact portion is formed on the outer peripheral edge portion like the rotor 18 of the above embodiment.
A disc spring 22 or a diaphragm type spring is used as a spring for pressing 1 onto the stator 6. Pressurization of the rotor by the disc spring is a pressurizing method for thinning the ultrasonic motor, but the rotor 21 of FIG.
No digging is provided as in No. 8. In the configuration of FIG. 6, a disc spring having a spring constant that generates a large pressing force with a slight displacement is used as the disc spring. Therefore, variations in the dimension of the motor in the thickness direction, the rotor 21, the disc spring 22,
Since a large uneven pressure distribution is generated due to the eccentricity of the stator 6 and the like, it is necessary to assemble the parts with accuracy.

In that sense, the stator fixing structure of this embodiment is advantageous because the stator height accuracy and the coaxiality between the stator and the rotor can be assembled with high accuracy.

In the stator 6 of this embodiment, the corners of the inner peripheral edge of the vibrator 6a are chamfered to form a surface inclined inward in the radial direction. This reduces unnecessary weight on the inner circumference and improves efficiency. A bearing cap 24 is provided on the rear lid 25, which is an upper end plate, so that the rotor shaft 11 projects only downward in FIG.

<Embodiment 5> FIG. 7 shows a fifth embodiment of the present invention. In the present embodiment, the stator 6 is fixed to the casing 26 in which the end plate portion 26a and the body portion are integrally molded. A cylindrical portion 2 having a hole 26c for press-fitting the bearing member 7 in the center of the end plate portion 26a of the casing 26.
6b is provided so that the stator 6 is provided on the end surface of the cylindrical portion 26b.
The fixed portion 6b is pressed by the flange portion 7b of the bearing member 7. Therefore, this stator support structure is the same as that already described in the embodiment of FIG. This embodiment is different from the embodiment of FIG. 1 in that the hole 6c of the stator 6 is inserted to the hole 2 of the casing end plate 26a.
6c, the length of the bearing member 7, the thickness of the fixed portion 6b of the stator 6 and the height of the cylindrical portion 26b are adjusted so that the cylindrical portion 7a of the bearing member 7 press-fitted into the casing 6c projects to the outside of the casing end plate portion 26a. The dimensions are designed. The cylindrical portion 7a of the bearing member 7 that protrudes outward from the casing end plate portion 26a is, for example, as shown in FIG. 8, when the ultrasonic motor is attached to a structural member 27 such as an optical device, the protruding bearing member 7a is a motor. It can be used as a mounting reference member. That is, the protruding bearing member 7a is inserted into the hole 27a of the structural member 27 and fitted therein, and the structural member 27 is inserted.
A screw 28 is inserted into an arc-shaped hole 27b and a washer 29 formed in the end of the motor, and the screw 28 is inserted into the end plate portion 26a of the motor.
The motor is attached to the structural member 27 by screwing into the screw hole 26d formed in the structure.

[0055]

As described above, in the ultrasonic motor having the improved structure according to the present invention, when the stator is fixed to the casing end plate or the like, the flanged bearing member is used without using screws or the like. At the same time as press-fitting into the hole of the end plate through the stator center hole, centering of the bearing and rear lid of the rotor shaft and the stator is also performed, so there are fewer parts than the ultrasonic motor of the conventional structure that uses screws to fix the stator. , A significant reduction in manufacturing man-hours, a significant reduction in manufacturing time, a significant reduction in manufacturing costs, and elimination of loosening of the stator coupling portion due to accumulated use. Also,
According to the present invention, it is also possible to manufacture a small ultrasonic motor, which is impossible with the conventional structure.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an ultrasonic motor according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of a structural portion particularly related to the present invention in the ultrasonic motor of FIG.

3 is a sectional view of the structural element shown in FIG. 2 and a view for explaining a method of assembling the structural element.

FIG. 4 is a sectional view of an ultrasonic motor according to a second embodiment of the present invention.

FIG. 5 is a sectional view of an ultrasonic motor according to a third embodiment of the present invention.

FIG. 6 is a sectional view of an ultrasonic motor according to a fourth embodiment of the present invention.

FIG. 7 is a sectional view of an ultrasonic motor according to a fifth embodiment of the present invention.

FIG. 8 is a diagram for explaining the situation when the motor of FIG. 7 is attached to a structural member such as another device.

FIG. 9 is an exploded perspective view of main components of a conventional ultrasonic motor.

FIG. 10 is a diagram showing a cross section of the component shown in FIG. 9 and an assembling method.

[Explanation of symbols]

1, 6; Stator 1a, 6a; Transducer 1b, 6b; Fixed part 1e; Screw through hole (clearance hole) 2, 8, 25; Rear lid 2a; Stator fixing part 2b; Screw hole 3; Bearing 4,9 Flexible printed circuit board 6e; vibration generating element (piezoelectric element) 6f; sliding material 7; bearing member 7a; non-flange portion (cylindrical portion) 7b; flange portion 7d; rotor shaft support hole 11; rotor shaft 12, 19, 22 ; Springs 13,17,2
0,26; Casing 18,21; Rotor 23; Spacer

Claims (9)

[Claims] 1. A stator having a bearing member having a flange formed on an outer peripheral surface thereof, and a fixed portion having a bearing member insertion hole for loosely fitting with a non-flange portion of the bearing member; And a stator fixing member having a stator support portion provided with a bearing member insertion hole for press-fitting a non-flange portion of the bearing member, and having a stator support portion to which the fixed portion of the stator is pressed. The non-flange portion of the bearing member is press-fitted into the bearing member insertion hole of the stator fixing member through the member insertion hole, and the stator of the stator is provided between the flange of the bearing member and the stator support portion of the stator fixing member. An ultrasonic motor characterized in that the stator is fixed to the stator fixing member by pinching the fixed portion. 2. The stator fixing member is an end plate of an ultrasonic motor, and a cylindrical portion serving as the stator supporting portion is projectingly provided on a surface of the end plate facing the fixed portion of the stator, 2. The ultrasonic motor according to claim 1, wherein the hole of the cylindrical portion is formed as the bearing member insertion hole of the stator fixing member, and the end surface of the cylindrical portion serves as a stator support surface. 3. The stator fixing member is an end plate portion of a casing of an ultrasonic motor, and a cylindrical portion serving as the stator support portion projects from a surface of the end plate portion facing the fixed portion of the stator. The ultrasonic motor according to claim 1, wherein the hole of the cylindrical portion is formed as a bearing member insertion hole, and the end surface of the cylindrical portion serves as a stator support surface. 4. The stator fixing member is an end plate portion of a casing of an ultrasonic motor, and the end plate portion of the stator facing the fixed portion has an annular surface as the stator support portion. And a hole that is opened in the center of the annular surface is formed as the bearing member insertion hole, and a cylindrical portion into which the non-flange portion of the bearing member is inserted is formed on the outer surface of the end plate portion. The ultrasonic motor according to claim 1, wherein the ultrasonic motor is projected. 5. The stator fixing member is an end plate of an ultrasonic motor, and the end plate facing the fixed portion of the stator is provided with an annular surface as the stator support portion in a protruding manner.
A hole opened at the center of the annular surface is configured as the bearing member insertion hole, and the hole extends into a cup-shaped portion formed so as to project to the outer surface of the end plate to form a blind hole. The ultrasonic motor according to claim 1, wherein the bearing member is protected from being exposed by the cup-shaped portion, and the cup-shaped portion serves as an oil reservoir of bearing lubricating oil. 6. A stator having a bearing member having a flange formed on an outer peripheral surface thereof, and a fixed portion having a bearing member insertion hole for loosely fitting with a non-flange portion of the bearing member, A stator fixing member provided with a bearing member insertion hole for press-fitting a non-flange portion of the bearing member; and a spacer inserted between the fixed portion of the stator and the stator fixing member. A non-flange portion of the bearing member is press-fitted into the bearing member insertion hole of the stator fixing member through the bearing member insertion hole of the stator, and the fixed portion of the stator and the spacer are attached by the flange of the bearing member. An ultrasonic motor characterized in that the stator is fixed to the stator fixing member by being brought into pressure contact with the stator fixing member. 7. The stator according to claim 1, wherein a tip end portion of a non-flange portion of the bearing member press-fitted into the bearing member insertion hole of the stator fixing member is exposed to the outside from the stator fixing member. 6 ultrasonic motors. 8. The bearing member is a tubular body, and a rotor shaft support hole portion for axially supporting a rotor shaft of the ultrasonic motor is provided at a position of a bearing member insertion hole of the stator fixing member. The ultrasonic motor according to claim 1 or 6, characterized in that. 9. A stator having a bearing member having a flange formed on an outer peripheral surface thereof, and a fixed portion having a bearing member insertion hole for loosely fitting with a non-flange portion of the bearing member, A stator fixing member having a bearing member insertion hole for press-fitting a non-flange portion of the bearing member, and a method of assembling an ultrasonic motor, comprising: the bearing member insertion hole of the stator; After inserting the non-flange portion of the bearing member into the bearing member insertion hole of the stator fixing member to center the bearing member insertion holes of the stator and the stator fixing member, the non-flange portion of the bearing member A method of assembling an ultrasonic motor, comprising: press-fitting the stator into a bearing member insertion hole of the stator fixing member to fix the stator to the stator fixing member.