JPH062998U - Ultrasonic motor rotor pressure spring - Google Patents

Abstract

(57) [Abstract] [Object] The present invention relates to a device in which a spring is integrally formed with a rotor of an ultrasonic motor. [Structure] A disk-shaped spring 5 is integrally formed on the rotor 2, a boss 6 is provided at the center of the spring 5, and a shaft 11 is press-fitted therein.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of an ultrasonic motor.

[0002]

[Prior art]

 Conventionally, coil springs, disc springs, etc. have been used as means for pressurizing the rotor to the stator of the ultrasonic motor, but a large space is required due to the structure, and there is rattling to prevent rotation between the rotor and shaft. Was easy to come out.

[0003]

[Problems to be solved by the device]

 The present invention aims to develop an ultrasonic motor which can be installed in a minimum space and has its rotor and shaft firmly fixed, excluding its drawbacks.

[0004]

[Means for Solving the Problems]

 Now, the solution means will be described with reference to the drawings. (A) A disk-shaped spring 5 is formed integrally with the rotor 2 on the inner peripheral portion of the rotor 2, and (b) the central portion of the spring 5. Boss 6 is provided. (C) The shaft 11 is press-fitted into the boss 6, or the shaft 11 is knurled and press-fitted.

[0005]

[Action]

 Since the present invention has the above-described structure, when the rotor 2 is pressed against the stator 1, when the boss 6 is pressed through the bearing 9, the spring 5 is elastically deformed as shown by the dotted line in FIG. To do.

[0006]

【Example】

 In implementing the present invention, the following can be done. (B) The rotor 2 and the spring 5 are made of the same material and made of elastic age-hardening aluminum alloy or fiber reinforced plastic. (B) The shaft 11 is pressed into the boss 6 at the center of the spring 5.

[0007]

[Effect of device]

 Therefore, the ultrasonic motor is compact, low-cost, and highly accurate.

[Brief description of drawings]

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

FIG. 2 is a sectional view showing a deformed state of the spring 5 when the spring 5, the rotor 2 and the boss 6 of the present invention are integrally formed, and the dotted line presses the boss 6.

[Explanation of symbols]

 1 Stator 2 Rotor 3 Elastic body 4 Piezoelectric body 5 Spring 6 Boss 7 Sliding material 8, 9 Bearing 10 Base 11 Shaft 12 Case 13 Screw

Claims (5)

[Scope of utility model registration request] 1. An ultrasonic motor comprising a stator 1 in which a plurality of piezoelectric elements are fixedly arranged on an elastic body, and a rotor 2 in pressure contact with the elastic body surface of the stator 1, and a spring 5
Is a rotor pressure spring of the ultrasonic motor integrally formed with the rotor 2. 2. The rotor pressure spring for an ultrasonic motor according to claim 1, wherein the spring 5 has a disk shape, and the plate thickness increases from the outer circumference toward the inner circumference. 3. The rotor pressure spring for an ultrasonic motor according to claim 1, wherein the boss 6 is integrally formed at the center of the spring 5. 4. The rotor pressure spring for an ultrasonic motor according to claim 1, wherein the spring 5 is an age hardening aluminum alloy. 5. The rotor pressure spring for an ultrasonic motor according to claim 1, wherein the spring 5 is made of fiber reinforced plastic.