Electric toothbrush with motor shaft stress detection function
This invention, which uses an inductive detection chip board to detect motor shaft stress in an electric toothbrush by squeezing the motor bearing housing, solves the wear problem of existing motor shaft stress detection functions and achieves highly reliable and stable motor shaft stress detection.
Patent Information
- Application Number
- CN202520245178.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-13
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2035-02-13
AI Technical Summary
The axial stress detection function of existing vibratory electric toothbrushes suffers from severe wear of the pressure-sensitive chip board due to the continuous rotation of the servo motor shaft, leading to failure after long-term use and resulting in unsatisfactory design reliability and stability.
The pressure-sensitive chip board is pressed by the bearing housing of the servo motor shaft. The deformation of the chip board is detected by the pressure-sensitive detection chip, thereby realizing the stress detection of the motor shaft and avoiding the inaccurate force measurement and reliability problems caused by direct chip mounting.
It achieves highly reliable and stable motor shaft stress detection, ensuring the motor shaft stress detection function of the servo motor and improving the accuracy of intelligent control of the electric toothbrush.
Smart Images
Figure CN223625708U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of stress detection technology, and more specifically to an electric toothbrush with motor shaft stress detection. Background Technology
[0002] Compared to traditional sonic and rotary designs, the sweeping-vibration electric toothbrush features a brush head that sweeps left and right during operation, while the brush bristles vibrate to simulate the Bass brushing technique, improving cleaning coverage and power. Currently, sweeping-vibration electric toothbrushes use servo motors to achieve the sweeping function. A built-in linear Hall effect sensor precisely monitors the motor's speed and angle at high frequency, transmitting the data to a control chip. The control chip calculates the pressure and power consumption required to overcome and outputs this information to the motor, causing the toothbrush handle to return to the preset angle, forming a complete control loop.
[0003] Vibrating electric toothbrushes incorporate pressure-sensing technology. When brushing force is too strong, the pressure sensor sends a signal to the control chip. The control chip then uses a preset program to automatically slow down the motor or adjust the vibration amplitude, ensuring the brush head continues to work at an appropriate pressure. For example, the design could include axial stress detection functionality in the electric toothbrush. Figure 1 As shown, a pressure-sensitive chip 300 is attached to the motor shaft 101. The chip detects the deformation of the motor shaft under stress to achieve the shaft stress detection function of "light pressure to start the brush head, heavy pressure to warn of brush head overload." The toothbrush head 200 is mounted on the motor shaft 101 for end-effector output. The pressure-sensitive chip 300 is connected to the control board 102 via an FPC cable. The control board 102 is mounted on the housing of the servo motor module 100. However, because the motor shaft rotates continuously during use, the pressure-sensitive chip cannot be attached to the motor shaft to detect its deformation.
[0004] In addition, existing technologies attempt to achieve shaft stress detection by squeezing the pressure-sensitive chip board with the shaft of a servo motor. However, since the motor shaft of the servo motor is constantly rotating and squeezing the pressure-sensitive chip during use, this design will greatly accelerate the wear of the pressure-sensitive chip board. After long-term use, the shaft stress will decay due to the wear of the pressure-sensitive chip board until it fails. The reliability and stability of the design are not ideal. Utility Model Content
[0005] The purpose of this invention is to provide an electric toothbrush with motor shaft stress detection, which is particularly applicable to the motor shaft stress detection of a vibrating electric toothbrush. It is used to sense the pressure state of the motor shaft during the operation of the electric toothbrush, and to provide sensing parameters for the intelligent control of the servo motor, so as to realize the precise and intelligent adjustment of the sweeping speed and sweeping amplitude in the vibrating working mode.
[0006] According to a first aspect of the present invention, an electric toothbrush with motor shaft stress detection is provided, comprising:
[0007] A servo motor having a motor body and a motor shaft extending from the motor body, the motor shaft being supported by a servo motor bearing housing coaxial with the motor body;
[0008] A servo motor bracket houses the servo motor, with the motor shaft of the servo motor serving as the output shaft, passing through a circular hole located on the front end face of the servo motor bracket.
[0009] The servo motor cover is adapted to and fastened to the servo motor bracket, so that the servo motor bracket, servo motor and servo motor cover form an integrated servo motor module.
[0010] A pair of chip board support pillars are set at the front end of the servo motor cover;
[0011] The pressure-sensitive chip board has its two ends fixed to the bottom of the pair of chip board support columns, and the pressure-sensitive chip board is located above the servo motor bearing seat;
[0012] A pressure-sensitive chip is mounted at the center of the pressure-sensitive chip board; and
[0013] A pair of fulcrum columns are provided on opposite sides of the servo motor bracket or on opposite sides of the servo motor cover.
[0014] The connection between the servo motor bracket and the rear structure is a thin-walled structure. When the motor shaft is subjected to force, it drives the servo motor module to deflect around the fulcrum column. The displacement of the servo motor bearing seat caused by the deflection is applied to the pressure-sensitive chip board. The pressure-sensitive chip is configured to detect the deformation of the pressure-sensitive chip board to detect the stress of the motor shaft.
[0015] As an optional embodiment, the pair of chip board support pillars are arranged symmetrically with respect to the pressure-sensitive chip.
[0016] As an optional embodiment, the direction of the line connecting the centers of the pair of chip board support pillars is defined as the x-direction, and the pressure-sensitive chip board forms a slot facing the pressure-sensitive chip along the y-direction perpendicular to the x-direction.
[0017] As an optional embodiment, the upper surfaces of the pair of chip board support pillars are configured as inclined slopes.
[0018] As an optional embodiment, the pressure-sensitive chip board and the pair of chip board support pillars are fixed together by fasteners to form a single unit.
[0019] As an optional embodiment, the pressure-sensitive chip board and the servo motor bearing housing may be in contact or not in contact in the initial state.
[0020] As an optional embodiment, the servo motor bracket and the servo motor housed therein are fixed together by fasteners.
[0021] As an optional embodiment, the servo motor cover and the servo motor bracket are fixed together as one unit via a snap-fit structure.
[0022] As an optional embodiment, the pair of fulcrum posts are disposed on opposite sides of the servo motor bracket, and an arc-shaped notch is provided on the servo motor cover at a position corresponding to the fulcrum posts to allow the fulcrum posts to extend.
[0023] As an optional embodiment, the electric toothbrush also includes an outer cylinder;
[0024] The integrated servo motor module is housed inside the outer cylinder, and the inclined surface of the upper surface of the pair of chip board support pillars abuts against the inner wall of the outer cylinder.
[0025] The electric toothbrush design with motor shaft stress detection according to the above embodiments of this utility model utilizes the bearing seat of the servo motor shaft to compress the pressure-sensitive chip board, thereby realizing the shaft stress detection function. The bearing seat of the servo motor shaft is the part closest to the brush head besides the motor shaft. When the user operates the electric toothbrush and presses the brush head (i.e., when the brush head and motor shaft are under force), the bearing seat is also the part that receives the most direct force besides the shaft, resulting in the most direct force and the least force attenuation. Therefore, in the design of this utility model, when the brush head is subjected to force, because the chip board support column on the servo motor cover is tightly fitted with the outer cylinder, the pressure-sensitive chip board above the support column cannot be displaced. The thin-walled structure of the servo motor cover deforms due to the lever effect. Based on this deformation, the servo motor module rotates around the fulcrum column, thereby causing the servo motor bearing seat to displace, further compressing the chip board, causing the chip board deformation to be detected by the chip, thus completing the shaft stress detection function. This avoids the inaccurate force measurement and reliability problems caused by directly mounting the sensing chip on the shaft.
[0026] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below may be considered part of the utility model subject matter of this disclosure, provided that such concepts do not contradict each other. Furthermore, all combinations of the claimed subject matter are considered part of the utility model subject matter of this disclosure.
[0027] The foregoing and other aspects, embodiments, and features of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description
[0028] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings.
[0029] Figure 1 This is a schematic diagram of the axial stress detection design for existing electric toothbrushes.
[0030] Figure 2 This is a schematic diagram of the design for detecting the shaft stress of an electric toothbrush motor according to an embodiment of the present invention.
[0031] Figure 3 Based on the foregoing Figure 2 A schematic diagram of the front-end cross-section of the embodiment.
[0032] Figure 4 Based on the foregoing Figure 2 A schematic diagram of a partial explosion structure in an embodiment.
[0033] Figure 5 , Figure 6 They are respectively based on the aforementioned Figure 2 Side view and top view of the embodiment.
[0034] Figure 7 Based on the foregoing Figure 2 A partial cross-sectional view of the electric toothbrush motor shaft stress detection design of the embodiment. Detailed Implementation
[0035] To better understand the technical content of this utility model, specific embodiments are provided below in conjunction with the accompanying drawings.
[0036] Various aspects of the present invention are described in this disclosure with reference to the accompanying drawings, which illustrate numerous illustrative embodiments. The embodiments disclosed herein are not necessarily intended to include all aspects of the present invention. It should be understood that the various concepts and embodiments described above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed herein are not limited to any particular implementation. Furthermore, some aspects of the present invention can be used alone or in any suitable combination with other aspects disclosed herein.
[0037] The electric toothbrush according to an embodiment of this utility model is designed to use the bearing seat of the servo motor shaft to press the pressure-sensitive chip board, and further detect the deformation of the pressure-sensitive chip board through a pressure-sensitive detection chip, thereby realizing the function of shaft stress detection. In the design of this utility model, the bearing seat of the servo motor shaft is the part closest to the brush head besides the shaft. When the brush head is pressed, the bearing seat is also the part that receives the most direct force besides the shaft. The force is the most direct and the force attenuation is the smallest. Therefore, through the electric toothbrush motor shaft stress detection proposed in this utility model, a highly reliable and stable motor shaft stress detection output is achieved.
[0038] Combination Figures 2-7 The electric toothbrush shown in the example includes a servo motor 110, a servo motor bracket 130, a servo motor cover 140, and a toothbrush head 200.
[0039] The servo motor 110 has a motor body and a motor shaft 101 extending from the motor body. For example... Figure 3 , Figure 4 As shown, the motor shaft 101 is supported by a servo motor bearing housing 124 that is coaxial with the motor body.
[0040] It should be understood that the servo motor 110 can be an existing commercial DC motor, including but not limited to brushless DC motors, coreless motors, etc.
[0041] A servo motor bracket 130 is used to house the servo motor 110. The motor shaft 101 of the servo motor 110 serves as the output shaft and passes through a circular hole 135 located on the front end face of the servo motor bracket. Figure 7 As shown, a toothbrush head 200 is detachably connected to the end of the motor shaft 101 to achieve end-effector execution.
[0042] The servo motor cover 140 is adapted to and fastened to the servo motor bracket 130, so that the servo motor bracket, servo motor and servo motor cover form an integrated servo motor module 100.
[0043] It should be understood that the servo motor bracket 130 and the servo motor cover 140 can be made of metal, metal alloy, or non-metallic materials through mold processing.
[0044] The servo motor bracket 130 and the servo motor cover 140 are both designed as roughly semi-cylindrical structures, so that when they are closed, they form a cylindrical structure that can press the servo motor.
[0045] Alternatively, the servo motor cover 140 and the servo motor bracket 130 can be fixed together as one piece via a snap-fit structure.
[0046] like Figure 2 , Figure 3 As shown, the servo motor bracket 130 and the servo motor 110 housed therein are fixed together by fasteners such as bolts.
[0047] Combination Figure 2 , Figure 3 , Figure 4 As shown, a pair of chip board support pillars 141 are also provided at the front end of the servo motor cover 140. Optionally, an L-shaped bend structure extends from opposite sides of the front end of the servo motor cover 140 toward the toothbrush head 200, and chip board support pillars 141 are symmetrically provided at the ends of the bend structure.
[0048] like Figure 2 , Figure 4 As shown, a pressure-sensitive chip board 120 is also provided at the front end of the servo motor cover 140. The two ends of the pressure-sensitive chip board 120 are respectively fixed to the bottom of a pair of chip board support columns 141, and the pressure-sensitive chip board 120 is located above the servo motor bearing seat 124.
[0049] Preferably, the pressure-sensitive chip board 120 is fixed from the bottom by fasteners such as bolts 121, thereby fixing the pressure-sensitive chip board 120 and a pair of chip board support columns 141 to form an integral unit.
[0050] Combination Figure 2 , Figure 3 As shown, the pressure-sensitive detection chip 300 is installed in the center of the pressure-sensitive chip board 120.
[0051] In this embodiment, a pair of pivot columns can be arranged on opposite sides of the servo motor bracket 130 or opposite sides of the servo motor cover 140 as rotation axes.
[0052] In this embodiment, a pair of pivot columns 131 are provided on opposite sides of the servo motor bracket 130 as rotation axes.
[0053] Combination Figures 2-7 As shown, the connection 135 between the servo motor bracket 130 and the rear structure is a thin-walled structure with a thickness of 0.5 to 1.5 mm. Therefore, when the motor shaft 101 is subjected to force, it drives the servo motor module 100 to deflect around the fulcrum column 131. The resulting displacement of the servo motor bearing seat is applied to the pressure-sensitive chip board 124. The pressure-sensitive detection chip 300 mounted on the pressure-sensitive chip board 124 is configured to detect the deformation of the pressure-sensitive chip board, thereby detecting the stress on the motor shaft.
[0054] As shown in the attached figures, the aforementioned pair of chip board support pillars 141 are arranged symmetrically around the pressure-sensitive chip.
[0055] like Figure 2 , Figure 3As shown, the direction of the line connecting the centers of the aforementioned pair of chip board support pillars is defined as the x-direction. The pressure-sensitive chip board forms a slot facing the pressure-sensitive chip along the y-direction, which is perpendicular to the x-direction. This slot can amplify the deformation of the chip board, enabling the pressure-sensitive chip to detect a stronger signal.
[0056] In a preferred embodiment, the upper surfaces of the aforementioned pair of chip board support pillars 141 are configured as inclined slopes, combined with the attached... Figure 7 As shown, the electric toothbrush also includes an outer tube 1000, an integrated servo motor module 100 housed within the outer tube 1000, and the inclined surface of the upper surface of the aforementioned pair of chip board support pillars is adapted to the shape of the inner wall surface of the outer tube and abuts against each other.
[0057] Therefore, combined with the appendix Figure 2 , Figure 4 as well as Figure 7 As shown, when a force F is applied to the toothbrush head, the chip board support column 141 on the servo motor cover is tightly fitted with the outer cylinder 1000, and the pressure-sensitive chip board 124 above the chip board support column 141 cannot be displaced. The thin-walled structure of the servo motor cover deforms due to the lever effect. This deformation drives the servo motor module to rotate around the fulcrum column as the axis. At this time, the displacement generated by the servo motor bearing seat will squeeze the pressure-sensitive chip board 124, causing the pressure-sensitive chip board 124 to deform and be detected by the pressure-sensitive detection chip 300, thereby completing the shaft stress detection function.
[0058] As an optional embodiment, the pressure-sensitive chip board and the servo motor bearing housing may be in contact or not in contact in the initial state, and only the initial state needs to be detected and calibrated.
[0059] As an optional embodiment, in conjunction with the appendix Figure 4 , Figure 5 , Figure 6 As shown, a pair of pivot posts are set on opposite sides of the servo motor bracket, and an arc-shaped notch is provided on the servo motor cover at the corresponding position of the pivot posts to allow the pivot posts to protrude.
[0060] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.
Claims
1. An electric toothbrush with motor shaft stress detection, comprising: A servo motor having a motor body and a motor shaft extending from the motor body, the motor shaft being supported by a servo motor bearing housing coaxial with the motor body; A servo motor bracket houses the servo motor, with the motor shaft of the servo motor serving as the output shaft, passing through a circular hole located on the front end face of the servo motor bracket. The servo motor cover is adapted to and fastened to the servo motor bracket, so that the servo motor bracket, servo motor and servo motor cover form an integrated servo motor module. Its characteristic is that it further includes: A pair of chip board support pillars are set at the front end of the servo motor cover; The pressure-sensitive chip board has its two ends fixed to the bottom of the pair of chip board support columns, and the pressure-sensitive chip board is located above the servo motor bearing seat; A pressure-sensitive chip is mounted at the center of the pressure-sensitive chip board; and A pair of fulcrum columns are provided on opposite sides of the servo motor bracket or on opposite sides of the servo motor cover. The connection between the servo motor bracket and the rear structure is a thin-walled structure. When the motor shaft is subjected to force, it drives the servo motor module to deflect around the fulcrum column. The displacement of the servo motor bearing seat caused by the deflection is applied to the pressure-sensitive chip board. The pressure-sensitive chip is configured to detect the deformation of the pressure-sensitive chip board to detect the stress of the motor shaft.
2. The electric toothbrush with motor shaft stress detection according to claim 1, characterized in that, The pair of chip board support pillars are arranged symmetrically with respect to the pressure-sensitive chip.
3. The electric toothbrush with motor shaft stress detection according to claim 1, characterized in that, The direction of the line connecting the centers of the pair of chip board support pillars is defined as the x-direction, and the pressure-sensitive chip board has a slot facing the pressure-sensitive chip along the y-direction perpendicular to the x-direction.
4. The electric toothbrush with motor shaft stress detection according to claim 1, characterized in that, The upper surfaces of the pair of chip board support pillars are set as inclined slopes.
5. The electric toothbrush with motor shaft stress detection according to claim 1, characterized in that, The pressure-sensitive chip board and the pair of chip board support pillars are fixed together by fasteners to form a whole.
6. The electric toothbrush with motor shaft stress detection according to claim 1, characterized in that, The pressure-sensitive chip board and the servo motor bearing housing are in contact or not in contact in the initial state.
7. The electric toothbrush with motor shaft stress detection according to claim 1, characterized in that, The servo motor bracket and the servo motor housed therein are fixed together by fasteners to form an integral unit.
8. The electric toothbrush with motor shaft stress detection according to claim 1, characterized in that, The servo motor cover and the servo motor bracket are fixed together by a snap-fit structure.
9. The electric toothbrush with motor shaft stress detection according to claim 1, characterized in that, The pair of fulcrum posts are located on opposite sides of the servo motor bracket, and an arc-shaped notch is provided on the servo motor cover at a position corresponding to the fulcrum posts to allow the fulcrum posts to extend.
10. The electric toothbrush with motor shaft stress detection according to any one of claims 1-9, characterized in that, The electric toothbrush also includes an outer tube; The integrated servo motor module is housed inside the outer cylinder, and the inclined surface of the upper surface of the pair of chip board support pillars abuts against the inner wall of the outer cylinder.