Electric toothbrush angle limiting counterweight motor
By designing the counterweight ring and limit structure in the electric toothbrush motor, the problems of imbalance in front and rear weight and lack of mechanical limits are solved, and the front and rear stress balance and angle limitation of the toothbrush handle are achieved, which improves the stability and safety of the toothbrush usage.
Patent Information
- Application Number
- CN202422383566.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-09-27
AI Technical Summary
The existing electric toothbrush motors have unbalanced weights in front and rear, which are prone to shake and lack mechanical limit structures, which leads to collision between the toothbrush head and the teeth, posing safety hazards.
Two relatively spliced brackets are used, with sub-assembly set on the outer sleeve, rotor assembly on the inner sleeve, shaft is arranged in the center and counterweight ring is arranged in sleeve, limiting protrusions are arranged at the rear end of the counterweight ring, and limiting columns are arranged at the rear end of the bracket to limit the swing angle of the shaft through the gap to achieve front and rear stress balance and angle limit.
Improve the swing inertia of the toothbrush handle, reduce eccentric shaking, enhance driving ability, and avoid adverse effects caused by excessive swing of the toothbrush head.
Smart Images
Figure CN223246409U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an electric toothbrush, in particular to an angle-limiting counterweight motor for an electric toothbrush. Background Art
[0002] An electric toothbrush requires a motor to drive the toothbrush head to swing back and forth. Existing electric toothbrush motors generally only have a motor body and a shaft extending outward. Because the toothbrush handle is loaded at the front end of this motor, the front end is heavy and the weight is unbalanced between the front and back. When swinging at high speed, it is easy to produce large vibrations. Furthermore, the reciprocating swing of the motor is completely dependent on the PWM signal for control and lacks a mechanical limit structure. Once the motor swings beyond the preset trajectory, it is easy to cause the toothbrush head to collide with the teeth, which not only affects product performance but also poses a safety hazard. Utility Model Content
[0003] The technical problem to be solved by the present invention is to provide an electric toothbrush angle limiting counterweight motor which helps to balance front and rear stresses, improves swing inertia and has an angle limiting function, in view of the deficiencies in the prior art.
[0004] In order to solve the above technical problems, the present utility model adopts the following technical solutions.
[0005] An angle-limiting counterweight motor for an electric toothbrush comprises two relatively assembled brackets, a stator assembly being sleeved on the outer sides of the two brackets, a rotor assembly being provided on the inner sides of the two brackets, a shaft being passed through and fixed on the center of the rotor assembly, a counterweight ring being sleeved on and fixed on the rear end of the shaft, the counterweight ring comprising two symmetrically arranged limiting protrusions, two limiting columns being formed on the rear end of the brackets, the two limiting columns being respectively arranged on the same side of the two limiting protrusions, and a gap being provided between the limiting protrusions and the limiting columns.
[0006] Preferably, the edge of the counterweight ring has an arc-shaped protrusion, and two limiting protrusions are symmetrically arranged at both ends of the arc-shaped protrusion.
[0007] Preferably, the counterweight ring is a metal counterweight ring.
[0008] Preferably, a first cut portion is formed on the outer side of the rear end of the shaft, and a second cut portion is formed on the inner side of the counterweight ring, and the first cut portion is in abutment with the second cut portion.
[0009] Preferably, a shell is included, and the shell is sleeved on the outside of the two brackets.
[0010] In the angle-limited counterweight motor for an electric toothbrush disclosed in the present invention, two brackets can be assembled and fixed by screws or snaps after being relatively assembled. The rotor assembly, consisting of a coil and a coil frame, is sleeved on the outside of the two brackets. The stator assembly with a magnet is arranged between the two brackets. The shaft rod passing through the center of the rotor assembly can be rotated by means of a bearing. On this basis, the present invention sleeves a counterweight ring with a certain weight on the rear end of the shaft rod. The weight of the counterweight ring itself helps the shaft rod to be closer to front-to-back mechanical balance after being assembled with the toothbrush handle, reducing the occurrence of eccentric jitter of the toothbrush handle. At the same time, the added weight of the counterweight ring can increase the reciprocating swing inertia of the shaft rod, thereby enhancing the driving ability of the toothbrush handle. In addition, the counterweight ring has symmetrically arranged limit protrusions on the left and right sides. The two limit protrusions are respectively aligned with the two limit posts at the rear end of the bracket. By properly setting the gap, a structural limit effect can be exerted on the rotational swing angle of the shaft rod, avoiding adverse effects caused by excessive swing angle of the shaft rod. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 Angle limit counterweight motor for electric toothbrush Figure 1 ;
[0012] Figure 2 This is a bottom view of the electric toothbrush angle limit counterweight motor;
[0013] Figure 3 This is the exploded view of the electric toothbrush angle limit counterweight motor;
[0014] Figure 4 Angle limit counterweight motor for electric toothbrush Figure 2 . DETAILED DESCRIPTION
[0015] The present invention will be described in more detail below with reference to the accompanying drawings and embodiments.
[0016] The utility model discloses an electric toothbrush angle limiting counterweight motor, combined with Figures 1 to 4 As shown, it includes two relatively assembled brackets 1, the outer sides of the two brackets 1 are provided with a stator assembly 2, the inner sides of the two brackets 1 are provided with a rotor assembly 3, the center of the rotor assembly 3 is penetrated and fixed with a shaft rod 4, the rear end of the shaft rod 4 is provided with a counterweight ring 5, the counterweight ring 5 includes two symmetrically arranged limiting protrusions 50, and two limiting columns 6 are formed at the rear end of the bracket 1. The two limiting columns 6 are respectively provided on the same side of the two limiting protrusions 50, and there is a gap 7 between the limiting protrusion 50 and the limiting column 6.
[0017] In the above structure, the two brackets 1 can be assembled and fixed by screws or snaps after being relatively assembled. The rotor assembly 3 composed of a coil and a coil frame is sleeved on the outside of the two brackets 1, and the stator assembly 2 with a magnet is arranged between the two brackets 1. The shaft 4 passing through the center of the rotor assembly 3 can rely on the bearing 8 to achieve rotation. On this basis, the utility model sleeves the counterweight ring 5 with a certain weight on the rear end of the shaft 4. The weight of the counterweight ring 5 itself helps the shaft 4 to be closer to the front and rear mechanical position after the toothbrush handle is assembled. Balance, reduce the eccentric shaking of the toothbrush handle, at the same time, under the action of the increased weight of the counterweight ring 5, the reciprocating swing inertia of the shaft 4 can be improved, thereby enhancing the driving ability of the toothbrush handle. In addition, the left and right sides of the counterweight ring 5 have symmetrically arranged limit protrusions 50, and the two limit protrusions 50 are respectively aligned with the two limit columns 6 at the rear end of the bracket 1. By reasonably setting the gap 7, the rotation and swing angle of the shaft 4 can be structurally restricted to avoid adverse effects caused by excessive swing angles of the shaft 4.
[0018] Regarding the preferred structure of the limiting protrusion 50, in this embodiment, the edge of the counterweight ring 5 has an arc-shaped protrusion 51, and two limiting protrusions 50 are symmetrically arranged at both ends of the arc-shaped protrusion 51. Figure 2 and Figure 4 As shown, the counterweight ring 5 in this embodiment can form an arc-shaped notch on one side and an arc-shaped protrusion on the other side, and two step-shaped limiting protrusions 50 are formed at the junction of the arc-shaped notch and the arc-shaped protrusion. The counterweight ring 5 with this structure can be processed and formed in one time, which has the advantage of being easy to produce and manufacture.
[0019] As a preferred embodiment, the counterweight ring 5 is a metal counterweight ring. As an alternative, the counterweight ring 5 can also be a counterweight ring made of other materials with equal weight and mechanical strength.
[0020] Regarding the preferred fixing method of the counterweight ring 5 and the shaft rod 4, in this embodiment, a first cut portion 40 is formed on the outer side of the rear end of the shaft rod 4, and a second cut portion 52 is formed on the inner side of the counterweight ring 5, and the first cut portion 40 and the second cut portion 52 are in abutment with each other.
[0021] As a preferred method, see Figure 3 This embodiment includes a housing 7 , which is sleeved on the outside of the two brackets 1 .
[0022] Regarding the preferred width of the gap 7, in this embodiment, the gap 7 is used to control the reciprocating rotation angle of the shaft 4 within ±15°. Of course, this is only for explanation, and the present invention does not limit the specific value of the angle.
[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements or improvements made within the technical scope of the present invention should be included in the scope of protection of the present invention.
Claims
1. An electric toothbrush angle limiting counterweight motor, characterized in that: The invention comprises two relatively assembled brackets (1), wherein the outer sides of the two brackets (1) are provided with a stator assembly (2), and the inner sides of the two brackets (1) are provided with a rotor assembly (3), a shaft (4) is passed through and fixed at the center of the rotor assembly (3), a counterweight ring (5) is provided and fixed at the rear end of the shaft (4), and the counterweight ring (5) comprises two symmetrically arranged limiting protrusions (50), and two limiting columns (6) are formed at the rear end of the bracket (1), and the two limiting columns (6) are respectively provided on the same side of the two limiting protrusions (50), and a gap (7) is provided between the limiting protrusion (50) and the limiting column (6).
2. The electric toothbrush angle limiting counterweight motor according to claim 1, characterized in that: The edge of the counterweight ring (5) has an arc-shaped protrusion (51), and two limiting protrusions (50) are symmetrically arranged at both ends of the arc-shaped protrusion (51).
3. The electric toothbrush angle limiting counterweight motor according to claim 1, characterized in that: The counterweight ring (5) is a hardware counterweight ring.
4. The electric toothbrush angle limiting counterweight motor according to claim 1, characterized in that: A first cut-away portion (40) is formed on the outer side of the rear end of the shaft (4), and a second cut-away portion (52) is formed on the inner side of the counterweight ring (5), wherein the first cut-away portion (40) and the second cut-away portion (52) are in abutment with each other.
5. The electric toothbrush angle limiting counterweight motor according to claim 1, characterized in that: It comprises a shell, which is sleeved on the outside of the two brackets (1).