Axial stress detection device for servo motor of sweep vibration type electric toothbrush and electric toothbrush applying axial stress detection device

Abstract

The utility model provides a shaft stress detection device for a servo motor of a sweeping vibration type electric toothbrush and the electric toothbrush using the shaft stress detection device. The shaft stress detection device comprises a servo motor module; the steel sheet is used for transmitting stress of the motor shaft; and a strain sensor chip. After the motor shaft is stressed, the motor shaft and the servo motor module generate displacement, and the displacement is synchronously transmitted to the first conduction part, so that the second conduction part generates elastic deformation detected by the sensor chip. According to the utility model, the L-shaped steel sheet is configured as a force transmission structure, the force transmission path of motor shaft stress detection is optimized, and the force applied to the toothbrush in the tooth brushing process is transmitted to the micro-deformation strain sensor for intelligently controlling the tooth brushing force.

Description

TECHNICAL FIELD

[0001] The utility model relates to stress detection technical field especially application electric toothbrush's stress detection, specifically relates to a kind of for the shaft stress detection device of sweep vibration type electric toothbrush servo motor and the electric toothbrush of application thereof. BACKGROUND

[0002] Compared with traditional acoustic wave type and rotary type electric toothbrush, sweep vibration type electric toothbrush has unique design characteristics, the brush head will complete two movements simultaneously when working: on the one hand, it performs left-right reciprocating sweep, on the other hand, it drives the bristles to vibrate at high frequency. This composite motion mode accurately simulates the standard action of the Bass toothbrushing method, effectively expands the cleaning coverage and enhances the cleaning strength. In terms of technical implementation, a servo motor is used to drive the brush head movement, and a built-in linear Hall sensor is used to accurately monitor the speed and rotation angle of the motor at high frequency. The real-time collected data is transmitted to the control circuit. The control circuit calculates the pressure value and power consumption parameters that need to be overcome based on these data, and outputs corresponding control instructions to the motor, ensuring that the brush rod of the electric toothbrush always maintains at the preset angle, thereby forming a complete closed-loop control system.

[0003] In terms of pressure sensing technology, sweep vibration type electric toothbrush is equipped with an intelligent pressure feedback mechanism. When the user brushes too hard, the built-in pressure sensor will immediately capture the pressure change signal and transmit it to the control chip. The control chip automatically controls the motor to reduce the speed or adjust the sweep amplitude according to the preset algorithm program, so that the brush head continues to work at an appropriate force, ensuring the cleaning effect and avoiding damage to the teeth and gums due to excessive force.

[0004] In the existing design, sweep vibration type electric toothbrush uses a servo motor for driving, and a scheme of pasting a sensor to the motor shaft is used for stress detection. On the one hand, the assembly is difficult, and the motor shaft is always rotating when the servo motor is running, so the pressure sensing chip cannot be pasted on the motor shaft to detect the deformation of the motor shaft. On the other hand, the motor will tear the FPC during rotation, resulting in pressure sensing failure. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of for sweep vibration type electric toothbrush servo motor's shaft stress detection device and the electric toothbrush of application thereof, optimize the force transmission path of motor shaft stress detection, realize the effective detection of sweep vibration type electric toothbrush servo motor shaft stress, and have excellent mechanical transmission linearity and stress transmission linear characteristic.

[0006] According to the first aspect of the purpose of the utility model, a kind of for sweep vibration type electric toothbrush servo motor's shaft stress detection device is proposed, comprising:

[0007] The servo motor module is formed integrally by mounting the servo motor into the motor support, and is arranged in the outer cylinder of the electric toothbrush, and the servo motor has a motor shaft extending to the outside from the front end surface of the motor support;

[0008] The steel sheet for stress transmission of the motor shaft has a first conducting part and a second conducting part connected to the first conducting part at an angle, the first conducting part is fixed to the front end surface of the servo motor module, one end of the second conducting part is connected to the first conducting part, the other end of the second conducting part away from the first conducting part is arranged on the motor support, and is pressed by the inner wall of the outer cylinder;

[0009] The strain sensor chip is arranged on the surface of the second conducting part;

[0010] The motor shaft is displaced after being stressed, and the displacement is synchronously transmitted to the first conducting part of the steel sheet and causes the second conducting part to be elastically deformed, and the strain sensor chip is arranged to detect the elastic deformation of the second conducting part to detect the stress output of the motor shaft.

[0011] As an optional embodiment, the motor support and the connecting part thereof to the rear end structure are thin-walled structures.

[0012] As an optional embodiment, the side surface cross section of the steel sheet is L-shaped as a whole.

[0013] As an optional embodiment, the steel sheet is a Y-shaped steel sheet, the first conducting part of the steel sheet is a fork-shaped structure and is fixed to the front end surface of the motor support across the motor shaft, and the second conducting part of the steel sheet is a straight line-shaped structure.

[0014] As an optional embodiment, symmetric notches are arranged on both sides of the straight line-shaped structure in the direction away from the end of the second conducting part.

[0015] As an optional embodiment, the surface position of the second conducting part corresponding to the notches is arranged as a sensor mounting area for mounting the strain sensor chip.

[0016] As an optional embodiment, the first conducting part is arranged to be fixed to the front end surface of the motor support by a fastener to form a rigid connection and constraint.

[0017] As an optional embodiment, the second conducting part is arranged to be fixed to the motor support by a fastener to form a rigid connection and constraint at the end.

[0018] As an optional embodiment, the motor support is provided with a fulcrum on each side, and the inner wall of the outer cylinder is provided with a groove on each side, which is matched with the fulcrum.

[0019] According to the second aspect of the utility model purposes, an electric toothbrush is provided, which comprises the shaft stress detection device for the sweep vibration type electric toothbrush servo motor of any one of the preceding embodiments.

[0020] The shaft stress detection device for the sweep vibration type electric toothbrush servo motor of the utility model embodiment has the following advantages: the L-shaped steel sheet is used as a motor shaft stress transmission structure, and the force applied to the toothbrush during brushing is transmitted to the micro-deformation strain sensor, so that the brushing force can be intelligently controlled; in the design of the utility model, the vertical downward pressure applied by the toothbrush drives the motor (shaft) to produce a downward micro-displacement, the front end of the L-shaped elastic steel sheet is rigidly connected with the motor end face, and the displacement is synchronously transmitted to the front section of the steel sheet; further, the tail end of the steel sheet is fixed to the support structure through rigid constraint to form a displacement constraint boundary; therefore, the difference in kinematic constraint causes the middle section of the steel sheet (corresponding to the installation area of the strain sensor) to produce measurable elastic deformation, the deformation amount thereof changes synchronously with the applied pressure, and thus the detection of the motor shaft stress is realized.

[0021] The shaft stress detection device for the sweep vibration type electric toothbrush servo motor has a stable force transmission path formed by the front end / rear end double rigid constraint, the steel sheet directly converts the motor shaft displacement into its own elastic deformation, the stress transmission efficiency is improved, the Hook's law relationship is met, the matching of the material and structure enables the micro-deformation (strain ∈~10 -6 ) to be accurately detected; the second conducting part is rigidly compressed by the outer cylinder (displacement constraint u=0), and the first conducting part forms a difference in two-end constraint with the motor shaft displacement, the rigid constraint boundary makes the system dynamic response more stable, the middle section of the steel sheet produces pure bending deformation, the strain sensor can capture the maximum strain region, the sensitivity is improved, and excellent performance is shown in the mechanical transmission linearity and stress transmission linearity characteristics, so that the effective detection of the sweep vibration type electric toothbrush servo motor shaft stress is realized, and the problems of strain gauge (strain detection chip) installation, service life and easy tearing of FPC in the prior art are solved.

[0022] It should be understood that all combinations of the aforementioned concepts and additional concepts described in greater detail below can be seen as part of the utility model subject matter of the present disclosure, as long as such concepts are not mutually contradictory. In addition, all combinations of the claimed subject matter are considered part of the utility model subject matter of the present disclosure.

[0023] The foregoing and other aspects, embodiments and features of the present teachings can be better understood and appreciated from the following description of the embodiments of the present teachings taken together with the accompanying drawings. Other additional aspects, embodiments and features of the present teachings will be apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures can be represented by a like numeral. For purposes of clarity, not every component can be called out in every drawing. There is now being described by way of example various embodiments of aspects of the present application with reference to the accompanying drawings.

[0025] Figure 1 is a schematic diagram of the overall structure of a sweep-vibration type electric toothbrush according to an embodiment of the present application.

[0026] Figure 2 is a schematic diagram of the internal structure of a sweep-vibration type electric toothbrush according to an embodiment of the present application.

[0027] Figure 3 is a schematic diagram of the front head structure of a sweep-vibration type electric toothbrush according to an embodiment of the present application.

[0028] Figure 4 is an exploded schematic diagram of a servo motor shaft stress detection device of a sweep-vibration type electric toothbrush according to an embodiment of the present application.

[0029] Figure 5 is a schematic diagram of the structure of a stress transmission steel sheet of a sweep-vibration type electric toothbrush according to an embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to better understand the technical content of the present application, specific embodiments are described below in conjunction with the accompanying drawings.

[0031] Aspects of the present application are described in this disclosure by reference to the drawings, in which a number of illustrative embodiments are shown. The embodiments of this disclosure need not necessarily include all aspects of the present application. It should be understood that various concepts and embodiments introduced above and those described below in more detail can be implemented in any of numerous ways, as the disclosed concepts and embodiments are not limited to any particular manner of implementation. Additionally, some aspects of the present application can be utilized independently, or in any suitable combination with other aspects of the present application.

[0032] {Example 1}

[0033] The sweep-vibration type electric toothbrush according to an embodiment of the present application aims to optimize the force transmission path of the motor shaft stress detection of the servo motor, and to realize effective detection of the servo motor shaft stress of the sweep-vibration type electric toothbrush. The sweep-vibration type electric toothbrush 10 according to the present application configures an L-shaped steel sheet as a force transmission structure, and transmits the force applied to the toothbrush head during tooth brushing to a micro-deformation strain sensor, for intelligent control of the tooth brushing force.

[0034] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures can be represented by a like numeral. For purposes of clarity, not every component can be called out in every drawing. There is now being described by way of example various embodiments of aspects of the present application with reference to the accompanying drawings. Figures 1 to 5As shown, the sweep-type electric toothbrush comprises a servo motor module 100 arranged in the outer cylinder of the electric toothbrush, a steel sheet 200 for motor shaft stress transmission, and a strain sensor chip 300. The strain sensor chip 300 is used to sense the motor shaft stress of the servo motor module 100 and detect the output electrical signal, especially sent to the controller of the electric toothbrush via FPC or other electrical signal transmission path.

[0035] As shown in the accompanying drawings, the servo motor module 100 is formed integrally by mounting the servo motor 101 to the inside of the motor support 102, and the whole is located in the outer cylinder of the electric toothbrush. The servo motor 101 has a motor shaft 101A extending from the front end surface of the motor support 102 to the outside.

[0036] The steel sheet 200 for motor shaft stress transmission has a first conducting part 201 and a second conducting part 202 connected at an angle with the first conducting part 201. The first conducting part 201 is fixed to the front end surface of the servo motor module 100, and one end 202a of the second conducting part 202 is connected to the first conducting part 201, and the other end 202b is arranged on the motor support 102 and is pressed tightly by the inner wall of the outer cylinder of the electric toothbrush.

[0037] The strain sensor chip 300, especially a patch-type strain sensor chip (IC) of existing design, is fixed to the surface of the second conducting part 202.

[0038] The motor shaft 101A causes displacement of the motor shaft and the servo motor module after being stressed. Since the other end 202b of the second conducting part is pressed tightly by the outer cylinder of the toothbrush, the aforementioned displacement is synchronously transmitted to the first conducting part 201 of the steel sheet 200 and causes elastic deformation of the second conducting part 202, and the strain sensor chip 300 is arranged to detect the elastic deformation of the second conducting part 202 to detect the motor shaft stress output.

[0039] As an optional embodiment, the motor support 102 and the connecting part thereof with the rear end structure are thin-walled structures.

[0040] As an optional embodiment, in combination with Figure 4 , Figure 5 , the side surface cross section of the steel sheet is overall L-shaped; in a preferred embodiment, the steel sheet is overall Y-shaped, the first conducting part is fork-shaped structure and is fixed to the front end surface of the motor support across the motor shaft, and the second conducting part is a one-character structure.

[0041] As an optional embodiment, in the direction away from the end of the second conducting part 202, symmetric notches 202c are arranged on both sides of the one-character structure to facilitate stress transmission and deformation. The symmetric notch design concentrates the stress on the sensor mounting area and reduces external vibration interference.

[0042] As an optional implementation, the surface position of the second conducting part corresponding to the gap is arranged as a sensor mounting area for mounting the strain sensor chip 300.

[0043] As an optional implementation, the first conducting part 201 is arranged to be fixed with the front end surface of the motor support through fasteners, forming rigid connection and constraint.

[0044] As an optional implementation, the other end 202b of the second conducting part 202 is arranged to be fixed with the outer surface of the motor support through fasteners, forming end rigid connection and constraint.

[0045] As an optional implementation, the second conducting part is arranged to be pressed and fixed to the outer surface of the motor support through the toothbrush shell, forming rigid constraint to the end of the second conducting part.

[0046] According to the second aspect of the purpose of the utility model, an electric toothbrush is provided, which comprises the shaft stress detection device for the sweep vibration type electric toothbrush servo motor of any of the foregoing embodiments.

[0047] The shaft stress detection device for the sweep vibration type electric toothbrush servo motor of the utility model embodiment has the advantages that the L-shaped steel sheet is used as the motor shaft stress transmission structure, the force applied to the brush head in the tooth brushing process is transmitted to the micro-deformation strain sensor, and the tooth brushing force is controlled intelligently; in the design of the utility model, the pressure applied by the toothbrush drives the motor (shaft) to produce micro-displacement, the displacement is transmitted to the front section of the steel sheet synchronously because the front end of the L-shaped elastic steel sheet is rigidly connected with the motor end surface; further, the tail end of the steel sheet is fixed to the support structure through rigid constraint, forming a displacement constraint boundary, thus, the middle section of the steel sheet (corresponding to the mounting area of the strain sensor) produces measurable elastic deformation through the difference of the kinematic constraint, the deformation amount changes synchronously with the applied pressure, and thus the detection of the motor shaft stress is realized.

[0048] The shaft stress detection device for the sweep vibration type electric toothbrush servo motor has the advantages that the stable force transmission path is formed through the front end / rear end double rigid constraint, excellent performance is exhibited in the mechanical transmission linearity and stress transmission linearity, the effective detection of the sweep vibration type electric toothbrush servo motor shaft stress is realized, the problems of strain sheet (strain detection chip) installation, service life and easy tearing of FPC in the prior art are solved, high reliability is achieved, the L-shaped steel sheet is arranged along the motor shaft direction, the limited space inside the electric toothbrush can be adapted to avoid interference with the battery, PCB and other components.

[0049] Although the utility model has disclosed as above with preferable embodiments, it is not used to limit the utility model. Those skilled in the art to which the utility model belongs can make various changes and decorations without departing from the spirit and scope of the utility model. Therefore, the protection scope of the utility model is accurate according to the definition of the claims.

Claims

1. A device for detecting shaft stress in a sweeping vibration type electric toothbrush servo motor, characterized in that, include: A servo motor module, which is integrated by mounting a servo motor into a motor bracket, is installed inside the outer cylinder of an electric toothbrush, and the servo motor has a motor shaft extending from the front end face of the motor bracket to the outside. The steel sheet used for transmitting stress on the motor shaft has a first conductive part and a second conductive part connected at an angle to the first conductive part. The first conductive part is fixed to the front end face of the servo motor module. One end of the second conductive part is connected to the first conductive part. The other end of the second conductive part away from the first conductive part is disposed on the motor bracket and is pressed by the inner wall of the outer cylinder. A strain sensor chip is disposed on the surface of the second conductive part; When the motor shaft is subjected to force, the motor shaft and the servo motor module are displaced. The displacement is synchronously transmitted to the first conductive part of the steel sheet and causes the second conductive part to undergo elastic deformation. The strain sensor chip is configured to detect the elastic deformation of the second conductive part in order to detect the stress output of the motor shaft.

2. The shaft stress detection device for a sweeping vibration type electric toothbrush servo motor according to claim 1, characterized in that, The motor bracket and its connection to the rear structure are thin-walled structures.

3. The shaft stress detection device for a sweeping vibration type electric toothbrush servo motor according to claim 1, characterized in that, The side cross-section of the steel sheet is generally L-shaped.

4. The shaft stress detection device for a sweeping vibration type electric toothbrush servo motor according to claim 1, characterized in that, The steel sheet is Y-shaped, with its first conductive part being a fork-shaped structure that spans the motor shaft and is fixed to the front end of the motor bracket, and its second conductive part being a straight structure.

5. The shaft stress detection device for a sweeping vibration type electric toothbrush servo motor according to claim 1, characterized in that, In the direction away from the end of the second conductive part, there are symmetrical notches on both sides of the straight structure.

6. The shaft stress detection device for a sweeping vibration type electric toothbrush servo motor according to claim 5, characterized in that, The surface position of the second conductive part corresponding to the notch is set as the sensor mounting area for mounting the strain sensor chip.

7. The shaft stress detection device for a sweeping vibration type electric toothbrush servo motor according to claim 1, characterized in that, The first conductive part is fixed to the front end face of the motor bracket by fasteners, forming a rigid connection and constraint.

8. The shaft stress detection device for a sweeping vibration type electric toothbrush servo motor according to claim 1, characterized in that, The second conductive part is configured to be fixed to the surface of the motor bracket by fasteners, forming a rigid connection and constraint at the end.

9. The shaft stress detection device for a sweeping vibration type electric toothbrush servo motor according to claim 1, characterized in that, The motor bracket has fulcrums on both sides, and the inner wall of the outer cylinder has grooves on both sides to fit the fulcrums.

10. An electric toothbrush, characterized in that, The device includes the shaft stress detection device for a sweeping electric toothbrush servo motor as described in any one of claims 1-9.

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