Rotation limiting motor
By incorporating a Hall sensor, permanent magnet, and a limiting protrusion structure into the motor design, the problems of waterproofing the electric toothbrush motor and straining the sensor cable were solved, enabling small-angle rotation and high-precision detection, and improving the motor's waterproof performance and the sensor's stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-08
- Publication Date
- 2026-03-20
AI Technical Summary
Existing electric toothbrush motors have problems such as water easily getting into the connection between the waterproof ring and the output shaft, and the sensor cable being easily pulled. In addition, the sensor layout needs to be redesigned, which increases costs.
It employs a Hall sensor, permanent magnet, and limiting protrusion structure to restrict the motor's small-angle rotation. Combined with a pressure sensor, it detects the contact between the brush head assembly and the teeth. The waterproof sleeve is tightly fitted with the output shaft.
This allows for small-angle rotation of the motor, improves waterproof performance, avoids straining of the sensor cable, reduces costs, and improves detection accuracy.
Smart Images
Figure CN224021584U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to toothbrush motor assembly technical field, especially to a rotation limit motor. BACKGROUND
[0002] The existing electric toothbrush motor realizes reciprocating drive or vibration to the brush head assembly through the output shaft, the rear cover or the front cover of the motor is provided with two position sensors for detecting the rotating position of the output shaft, the motor itself is 360-degree rotating type, and the rotating position can be acquired through the position sensor to realize rotation within a given angle range, and the drive to the brush head assembly can be realized through 360-degree rotation or rotation within a given angle range.
[0003] For the 360-degree rotating type motor, the rotating angle of the output shaft is 360 degrees, and the waterproof ring sleeved with the output shaft cannot be tightly fitted, so as to avoid affecting the actual rotation of the motor, therefore, when the motor continuously rotates by 360 degrees, water slowly enters the connection between the waterproof ring and the output shaft.
[0004] In addition, the 360-degree rotating type motor cannot generally install a sensor on the output shaft, because the sensor wire cannot follow the 360-degree rotation, and the solution is to install a conductive slip ring, but the structure layout of the motor needs to be modified, and the cost is increased.
[0005] For the driving mode of the motor rotating within a given angle range, the motor itself is still 360-degree rotating type, and it is still difficult to avoid the pulling of the sensor wire beyond the range during the start and stop or working process of the motor, especially when the user shakes the electric toothbrush in the off state, which is more likely to cause uncontrollable pulling of the sensor wire.
[0006] Therefore, there is an urgent need for a rotation limit motor that can solve one or more of the above problems. INVENTION CONTENTS
[0007] To solve one or more problems in the prior art, the utility model provides a rotation limit motor. The utility model adopts the technical scheme that the motor includes a motor body, the two ends of the motor body are respectively provided with a front cover and a rear cover, the front cover forms an avoiding passage, the output shaft of the motor body is provided with a mounting surface, the mounting surface is provided with a pressure sensor, and the wire of the pressure sensor passes through the avoiding passage and is drawn out.
[0008] The rear cover is provided with two limiting protrusions, the rear cover is provided with a first support, the first support is provided with a Hall sensor, the rear end of the output shaft is fixedly provided with a second support, the second support is provided with a trigger flange extending outward, the second support is provided with a permanent magnet, the two limiting protrusions limit the rotation range of the trigger flange, and the trigger flange is used for triggering the Hall sensor.
[0009] When the output shaft drives the second support to rotate, the trigger flange follows to move close to or away from the Hall sensor, and the wire is rotated in the avoiding channel along with the output shaft.
[0010] In some embodiments, the connecting piece fixes the second support and the permanent magnet at the rear end of the output shaft.
[0011] In some embodiments, the first support is arranged above the second support and the permanent magnet, and the Hall sensor is arranged on one side of the first support facing the second support.
[0012] Further, the second support is provided with a master control board, and the master control board is electrically connected with the Hall sensor and the motor body.
[0013] In some embodiments, the second support is provided with a limiting flange, and the limiting flange is clamped with the permanent magnet.
[0014] In some embodiments, the outer wall of the output shaft is formed with a groove, and the mounting surface is the bottom surface of the groove.
[0015] In some embodiments, further comprising: a waterproof sleeve, the waterproof sleeve is sleeved on the front cover, the output shaft passes out of the waterproof sleeve, and the output shaft is tightly matched with the waterproof sleeve.
[0016] Further, the waterproof sleeve is formed with an annular butt joint portion extending towards the motor body, and the annular butt joint portion is tightly matched with the output shaft.
[0017] Further, a fastening elastic member is arranged on the outer side wall of the annular butt joint portion, and the fastening elastic member presses the annular butt joint portion on the outer side wall of the output shaft. The fastening elastic member can be a spring.
[0018] The technical effects achieved by the utility model are as follows: through the Hall sensor, the permanent magnet, the trigger flange and the two limiting protrusions, the rotation driving of the motor at a small angle is realized, and the rotation angle range of the motor is about 60 degrees; within the rotation range of the motor, the position detection of the motor output shaft is realized through a single Hall sensor, and the detection accuracy is ensured, and one position sensor can be saved compared with a traditional 360-degree rotation type motor.
[0019] The rotation angle of the trigger flange is limited by the two limiting protrusions, so that the reciprocating rotation of the motor is always within the preset angle range, and compared with the traditional 360-degree rotating motor, the wire of the pressure sensor can be effectively prevented from being excessively pulled;
[0020] The pressure sensor is used to detect the motor output shaft, so as to detect whether the brush head assembly connected with the motor output shaft is pressed against the teeth.
[0021] Since the motor only needs to rotate within a small angle range, the waterproof sleeve can be tightly fitted with the motor output shaft, so as to improve the waterproof performance. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 is a schematic view of the utility model;
[0023] Figure 2 is a sectional view of the utility model;
[0024] Figure 3 is a sectional view of the utility model;
[0025] Figure 4 is a sectional view of the utility model;
[0026] Figure 5 is an exploded view of the utility model;
[0027] Figure 6 is a schematic view of the rear cover of the utility model.
[0028] REFERENCE NUMERALS
[0029] 1, motor body 10, front cover 100, avoiding passage 11, rear cover 110, limiting protrusion 12, output shaft 120, mounting surface 2, pressure sensor 20, wire 3, waterproof sleeve 30, annular butt joint 31, fastening elastic member 4, first support 40, Hall sensor 41, second support 410, limiting flange 411, trigger flange 42, permanent magnet 43, connecting piece 44, main control board. DETAILED DESCRIPTION
[0030] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious, the specific embodiments of the utility model are described in detail below in combination with the drawings. In the following description, a lot of specific details are set forth in order to fully understand the utility model. However, the utility model can be implemented in many other ways different from the description, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, so the utility model is not limited by the following disclosed specific embodiments.
[0031] This utility model discloses a rotation limit motor, such as Figures 1-3 As shown, the motor includes a motor body 1, with a front cover 10 and a rear cover 11 installed at both ends of the motor body 1, the front cover 10 forming a clearance channel 100, the output shaft 12 of the motor body 1 having a mounting surface 120, a pressure sensor 2 installed at the mounting surface 120, and the ribbon cable 20 of the pressure sensor 2 passing through the clearance channel 100.
[0032] like Figures 4-6 As shown, the rear cover 11 is provided with two limiting protrusions 110, the rear cover 11 is equipped with a first bracket 4, the first bracket 4 is equipped with a Hall sensor 40, the rear end of the output shaft 12 is fixedly equipped with a second bracket 41, the second bracket 41 is provided with an outwardly extending trigger flange 411, the second bracket 41 is equipped with a permanent magnet 42, the two limiting protrusions 110 limit the rotation range of the trigger flange 411, and the trigger flange 411 is used to trigger the Hall sensor 40;
[0033] When the output shaft 12 drives the second bracket 41 to rotate, the trigger flange 411 will move closer to or further away from the Hall sensor 40, and the ribbon cable 20 will rotate with the output shaft 12 within the clearance channel 100.
[0034] It should be noted that the limiting angle of the two limiting protrusions 110 relative to the trigger flange 411 can be 60 degrees, 50 degrees, 40 degrees, 30 degrees, etc. The clearance channel 100 is funnel-shaped, and the range of rotation it provides to the ribbon cable 20 is approximately the same as the limiting angle provided by the two limiting protrusions 110. Figure 3 As shown, the outer wall of the output shaft 12 has a groove, and the mounting surface 120 is the bottom surface of the groove. The pressure sensor 2 detects whether the brush head assembly connected to the output shaft 12 is pressing against the teeth by detecting the deformation of the output shaft 12.
[0035] Furthermore, combining Figure 4 , Figure 5 As shown, the second bracket 41 and the permanent magnet 42 are fixed to the rear end of the output shaft 12 by a connector 43, which is a screw. The first bracket 4 is suspended above the second bracket 41 and the permanent magnet 42 and is fixedly connected by screws. The Hall sensor 40 is installed on the side of the first bracket 4 facing the second bracket 41. The second bracket 41 is equipped with a main control board 44, which is electrically connected to the Hall sensor 40 and the motor body 1.
[0036] Combination Figure 5 , Figure 6As shown, the second support 41 is provided with a limiting flange 410, the limiting flange 410 is clamped with the permanent magnet 42, and the second support 41 can be magnetized by the permanent magnet 42.
[0037] Specifically, as Figures 1-3 As shown, the motor body 1 is also provided with a waterproof sleeve 3, the waterproof sleeve 3 is sleeved on the front cover 10, the output shaft 12 penetrates through the waterproof sleeve 3, and the output shaft 12 is tightly fitted with the waterproof sleeve 3.
[0038] In order to improve the waterproof performance of the motor, the waterproof sleeve 3 can be improved as follows: the waterproof sleeve 3 is formed with an annular butt joint portion 30 extending towards the motor body 1, the annular butt joint portion 30 is tightly fitted with the output shaft 12; a fastening elastic element 31 is installed on the outer side wall of the annular butt joint portion 30, the fastening elastic element 31 presses the annular butt joint portion 30 on the outer side wall of the output shaft 12, and the fastening elastic element 31 can be a spring.
[0039] In summary, through the above-mentioned Hall sensor, permanent magnet, trigger flange and two limiting protrusions, the small angle rotation driving of the motor is realized, and the rotation angle range of the motor is about 60 degrees; within the rotation range of the motor, the position detection of the motor output shaft is realized through a single Hall sensor and the detection accuracy is ensured, and one position sensor can be saved compared with the traditional 360-degree rotation motor.
[0040] The rotation angle of the trigger flange is limited by the two limiting protrusions, so that the reciprocating rotation of the motor is always within the preset angle range, and the wire of the pressure sensor can be effectively prevented from being excessively pulled compared with the traditional 360-degree rotation motor.
[0041] The added pressure sensor is used to detect the motor output shaft, and then it is detected whether the brush head assembly connected with the motor output shaft is pressed against the teeth.
[0042] Since the motor only needs to rotate within a small angle range, the waterproof sleeve can be tightly fitted with the motor output shaft, thereby improving the waterproof performance.
[0043] The above-described embodiments only express one or more embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.
Claims
1. A rotation limit motor, characterized in that, The motor includes a motor body, with a front cover and a rear cover installed at both ends of the motor body, the front cover forming a clearance channel, the output shaft of the motor body having a mounting surface, a pressure sensor being installed at the mounting surface, and the pressure sensor's cable passing through the clearance channel. The rear cover is provided with two limiting protrusions, and a first bracket is installed on the rear cover. A Hall sensor is installed on the first bracket. A second bracket is fixedly installed at the rear end of the output shaft. The second bracket is provided with an outwardly extending trigger flange. A permanent magnet is installed on the second bracket. The two limiting protrusions limit the rotation range of the trigger flange. The trigger flange is used to trigger the Hall sensor. When the output shaft drives the second bracket to rotate, the trigger flange will move closer to or further away from the Hall sensor, and the ribbon cable will rotate with the output shaft within the clearance channel.
2. The rotation limit motor according to claim 1, characterized in that, Also includes: A connector that secures the second bracket and the permanent magnet to the rear end of the output shaft.
3. The rotation limit motor according to claim 1, characterized in that, The first bracket is suspended above the second bracket and the permanent magnet, and the Hall sensor is installed on the side of the first bracket facing the second bracket.
4. The rotation limit motor according to claim 3, characterized in that, The second bracket is equipped with a main control board, which is electrically connected to the Hall sensor and the motor body.
5. The rotation limit motor according to claim 1, characterized in that, The second bracket is provided with a limiting flange, which is engaged with the permanent magnet.
6. The rotation limit motor according to claim 1, characterized in that, The outer wall of the output shaft has a groove, and the mounting surface is the bottom surface of the groove.
7. The rotation limit motor according to claim 1, characterized in that, Also includes: A waterproof sleeve is fitted onto the front cover, and the output shaft extends through the waterproof sleeve and is tightly fitted with the waterproof sleeve.
8. The rotation limit motor according to claim 7, characterized in that, The waterproof sleeve has an annular mating portion extending toward the motor body, and the annular mating portion is tightly fitted with the output shaft.
9. The rotation limit motor according to claim 8, characterized in that, A fastening elastic element is installed on the outer wall of the annular docking part, and the fastening elastic element presses the annular docking part against the outer wall of the output shaft.
10. The rotation limit motor according to claim 9, characterized in that, The fastening elastic element is a spring.