Ultrasonic motor

Abstract

The utility model relates to the technical field of motors, in particular to an ultrasonic motor, which comprises a framework, a rotor assembly arranged on the framework, a stator assembly, a rotating shaft coaxially rotating with the rotor assembly and provided with one end protruding out of one end of a shell, and a limiting piece connected to the other end of an output shaft. A limiting groove is formed in the other end of the framework, the width of the limiting groove is smaller than the length of the limiting piece, and the limiting piece rotates in the limiting groove along with the rotating shaft at a limited rotating angle. The utility model aims to provide the ultrasonic motor, and the stability of the motor during operation is improved by using the framework as the integral structure of the motor.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, concretely relates to an ultrasonic motor. BACKGROUND

[0002] The use rate of the electric toothbrush is higher and higher, along with the market occupancy increase, how to reduce the production cost to meet the use demand of different consumers is the problem that the producer needs to consider, and the cost of the electric toothbrush mainly concentrates on the motor drive structure. The drive structure of the existing electric toothbrush is complex, and the vibration noise is big, the amplitude is obvious, which influences the comfort of the electric toothbrush when using. SUMMARY

[0003] In order to overcome the shortcomings and insufficient of prior art, the utility model discloses a kind of ultrasonic motors, the skeleton is used as the overall structure of motor, improve the stability when motor operates.

[0004] An ultrasonic motor, comprising a skeleton, a rotor assembly disposed on the skeleton, a stator assembly, a shaft coaxial with the rotor assembly and protruding from one end of the housing, and a limiting piece connected to the other end of the output shaft;The other end of the skeleton is provided with a limiting groove, the width of the limiting groove is less than the length of the limiting piece, and the limiting piece rotates in the limiting groove with a limited rotation angle.

[0005] The rotor assembly includes a rotor body and a plurality of magnets installed in the rotor body, and the shaft passes through the rotor body and is connected coaxially with the rotor body.

[0006] The limiting groove has two, and the two limiting grooves are symmetrically arranged on the other end of the skeleton about the shaft.

[0007] The two ends of the shaft and the skeleton are connected by bearings.

[0008] The shaft seat is a double outer ring tapered roller bearing.

[0009] The skeleton is an integral hollow structure.

[0010] The utility model has the advantages of:

[0011] The utility model relates to an ultrasonic motor, by canceling the shell and the back cover, other components in the motor are fixed on the skeleton, reduce the probability of collision and friction when the motor starts after the connection between the skeleton and the shell and the back cover, improve the stability when the shaft rotates, effectively reduce the sound when the motor operates, improve the comfort when the electric toothbrush is used. BRIEF DESCRIPTION OF DRAWINGS

[0012] The utility model is further illustrated by the drawings, but the embodiment in the drawings does not constitute any limitation to the utility model, and other drawings can be obtained according to the following drawings without creative labor for the ordinary skilled in the art.

[0013] Fig. 1 It is the three-dimensional structure schematic view of the utility model.

[0014] Fig. 2 It is the explosion drawing of the utility model.

[0015] Fig. 3 It is the sectional view of the utility model.

[0016] Reference signs

[0017] Skeleton - 100, rotor assembly - 101, stator assembly - 102, rotating shaft - 103, limiting sheet - 104, limiting groove - 105, rotor main body - 106, magnet - 107, bearing - 109. Specific implementation

[0018] In order to make the above purpose, features and advantages of the utility model more obvious and easy to understand, the specific implementation of the utility model is described in detail below combined with the drawings. In the following description, a lot of specific details are set forth in order to fully understand the utility model. But the utility model can be implemented in many other ways different from the description, and the skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the following disclosed specific examples.

[0019] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0020] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0021] With the increasing popularity of electric toothbrushes and their growing market share, manufacturers need to consider how to reduce production costs to meet the diverse needs of consumers. The main cost of electric toothbrushes lies in the motor drive structure. Existing electric toothbrushes have complex drive structures that produce significant noise and amplitude vibrations, affecting user comfort.

[0022] To address the aforementioned problems, this embodiment discloses an ultrasonic motor, the structure of which is as follows: Figs. 1-3 As shown, the motor includes a frame 100, a rotor assembly 101 disposed on the frame 100, a stator assembly 102, a rotating shaft 103 that rotates coaxially with the rotor assembly and protrudes from one end of the housing, and a limiting piece 104 connected to the other end of the output shaft; the other end of the frame 100 is provided with a limiting groove 105, the width of the limiting groove 105 is less than the length of the limiting piece, and the limiting piece rotates within the limiting groove 105 with the rotating shaft 103 with a limited rotation angle.

[0023] Specifically, in this embodiment of an ultrasonic motor, the outer shell and back cover are eliminated, and other components inside the motor are uniformly fixed on the frame 100. Preferably, the frame 100 is a one-piece molded hollow structure. This frame 100 structure reduces the probability of collisions and friction that occur when the motor starts after the frame 100 is connected to the outer shell and back cover, improves the stability of the rotating shaft 103 during rotation, effectively reduces the noise during motor operation, and enhances the comfort of using the electric toothbrush.

[0024] Specifically, the rotor assembly 101 includes a rotor body 106 and a plurality of magnets 107 installed within the rotor body 106; the rotating shaft 103 passes through the rotor body 106 and is rotatably connected to the rotor body 106 coaxially. In this embodiment, a bearing 109 is connected between the other end of the output shaft and the housing. This bearing 109 is preferably a double outer ring tapered roller bearing 109, which improves the strength and stability of the motor during vibration.

[0025] from Fig. 2 It can be seen that in this embodiment, there are two limiting grooves 105, which are symmetrically arranged about the rotation axis 103 at the other end of the frame 100. The limiting grooves 105 of the above structure allow both ends of the limiting piece 104 to reciprocate within the limiting grooves 105.

[0026] It should be explained finally that the above embodiment is only used to illustrate the technical scheme of the utility model, and is not the limit of the protection scope of the utility model, although the utility model is explained in detail with reference to the preferred embodiment, the ordinary skilled in the art should understand that the technical scheme of the utility model can be modified or replaced equivalently, and does not deviate from the essence and scope of the technical scheme of the utility model.

Claims

1. An ultrasonic motor characterized by comprising: The application relates to a motor, which comprises a frame, a rotor assembly arranged on the frame, a stator assembly, a rotating shaft coaxial with the rotor assembly and protruding from one end of the frame, and a limiting piece connected to the other end of the rotating shaft. The other end of the frame is provided with limiting grooves, the width of the limiting grooves is smaller than the length of the limiting piece, and the limiting piece rotates in the limiting grooves with a limited rotation angle. The rotor assembly comprises a rotor body and a plurality of magnets arranged in the rotor body, the rotating shaft passes through the rotor body and is coaxially connected with the rotor body.

2. The ultrasonic motor according to claim 1, wherein The number of the limiting grooves is two, and the two limiting grooves are symmetrically arranged on the other end of the frame with respect to the rotating shaft.

3. The ultrasonic motor according to claim 1, wherein Bearing is arranged between the two ends of the rotating shaft and the frame.

4. The ultrasonic motor of claim 1, wherein The bearing is a double-outer-ring tapered roller bearing.

5. An ultrasonic motor according to claim 4, wherein The frame is an integrally-formed hollow structure.

6. The ultrasonic motor of claim 1, wherein ​

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