CN213722578U - Motor positioning and stopping mechanism for electric double-head rolling toothbrush - Google Patents

Abstract

The motor positioning and stopping mechanism for the electric double-head rolling toothbrush comprises a braking component and an inertia component, wherein the braking component comprises a fixed part and a moving part connected with an output shaft of a motor, the fixed part and the moving part are provided with mutually matched stopping structures, the inertia component and the moving part are driven by the output shaft of the motor, and the inertia component can rotate relative to the output shaft of the motor under the action of self inertia when the rotating speed of the output shaft of the motor changes. When the motor is powered off, the rotating speed of the motor output shaft is gradually reduced, the inertia component and the motor output shaft rotate relatively, then the moving component is pushed or pulled, and the fixed component and the stop structure on the moving component abut against each other to prevent the motor output shaft from rotating. The motor positioning and stopping mechanism adopts a pure mechanical structure, does not have any electric element, has simple and compact integral structure and low cost, and is particularly suitable for electric appliances which have small internal space, high rotating speed and inconvenient control of a travel switch and a servo motor like an electric toothbrush.

Description

Motor positioning and stopping mechanism for electric double-head rolling toothbrush

Technical Field

The utility model relates to a motor position control technical field especially relates to a motor location stop gear who is used for electronic double-end to rolling toothbrush.

Background

Sometimes, it is necessary for the motor to be stopped at a certain position, for example, the electric two-head rolling toothbrush in chinese patent CN110840612A needs the motor to be stopped and then two brush head bodies are aligned together. If the two brush head bodies 10 are in the position shown in fig. 1 after the motor is stopped, the gap between the bristle bundles in the middle of the brush head is too large, and toothpaste is easily squeezed into the gap when the toothbrush is used next time, so that the user experience is reduced.

Closed loop control is a common way to implement motor position control, including motor stop position control. The closed-loop control carries out position correction according to the output feedback of a control object, and the PID algorithm is the simplest and most common one in the closed-loop control algorithm and is widely applied. For example, many servo motors employ brakes and PID control to achieve motor position stop. The way of achieving the motor position stop by PID control is not well suited in the electric toothbrush in view of cost.

As is well known, electrification of a mechanical part is a common means for reducing the volume of a conventional mechanical structure, and if an electrical part controlled by a conventional servo motor PID is changed into a pure mechanical structure, a very complicated control mechanism is required, and the volume of the control mechanism is inevitably increased, so that the control mechanism is difficult to be installed in a housing of an electric toothbrush, and the cost is also likely to be increased. For the above reasons, no device relying on a purely mechanical structure to achieve the positioning and stopping of the motor has been seen in the electric toothbrush.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a simple structure, compact pure mechanical type are used for motor positioning stop mechanism of electronic double-end to rolling toothbrush.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a motor positioning and stopping mechanism for an electric double-head rolling toothbrush is used for positioning and stopping a motor output shaft for transmitting torque at a set position and comprises a braking component and an inertia component, wherein the braking component comprises a fixed component which keeps still in the running process of a motor and a movable component which is connected with the motor output shaft, the fixed component and the movable component are provided with mutually matched stopping structures, the inertia component and the movable component are driven by the motor output shaft to rotate, the inertia component and the motor output shaft can generate relative rotation due to self inertia effect when the rotating speed of the motor output shaft changes, and the inertia component and the movable component are arranged in an inner cavity of a toothbrush outer shell;

after the motor is powered off, the rotating speed of the output shaft of the motor is gradually reduced, the inertia component and the output shaft of the motor rotate relatively under the action of self inertia, then the inertia component pushes or pulls the moving part, the stop structure of the moving part is promoted to be close to the stop structure of the immovable part, and the stop structure of the moving part abuts against the stop structure of the immovable part to prevent the output shaft of the motor from rotating.

In an embodiment of the present invention, the inertia component includes an inertia ring sleeved on the motor output shaft, the inertia ring is provided with a connection through hole, a spiral protrusion or depression structure is provided on a hole wall of the connection through hole and is connected to the motor output shaft passing through the connection through hole through the spiral protrusion or depression structure, the movable member includes a movable ring connected to the motor output shaft and constrained to move only along an axial direction of the motor output shaft, and the movable ring is provided with a stop structure;

after the motor is powered off, the rotating speed of the output shaft of the motor is gradually reduced, the inertia ring rotates relative to the output shaft of the motor under the action of self inertia and moves along the axial direction of the output shaft of the motor while rotating around the output shaft of the motor under the action of a spiral protruding or sunken structure, the movable ring is pushed by the inertia ring to be close to the immovable part along the axial direction of the output shaft of the motor, so that the stop structure on the movable ring is abutted against the stop structure on the immovable part, and the rotation of the output shaft of the motor is prevented.

The movable ring or the inertia ring is provided with magnetism or is provided with a hanging buckle, the movable ring is connected with the inertia ring in a magnetic attraction mode or is movably connected with the inertia ring through the hanging buckle, and the inertia ring can rotate 360 degrees relative to the movable ring.

Preferably, the stopping structure comprises convex teeth or friction plates arranged on the fixed member and the movable ring, and the convex teeth or friction plates on the fixed member and the convex teeth or friction plates on the movable ring abut together to form a braking force to prevent the motor output shaft from rotating.

Furthermore, the movable ring is provided with a key for connecting the output shaft of the motor, the movable ring is restrained by the key so as to move only along the axis direction of the output shaft of the motor, the convex teeth or the friction plates on the movable ring are arranged on the top end face of the movable ring, the convex teeth or the friction plates on the fixed member are positioned right above the movable ring, and the inertia ring pushes the movable ring to move upwards along the axial direction of the output shaft of the motor, so that the convex teeth or the friction plates on the top end of the movable ring abut against the convex teeth or the friction plates on the fixed member.

In another two embodiments of the present invention, the inertia component includes an inertia ring sleeved outside the motor output shaft, the moving part includes a rotating bracket and a braking pawl provided with a stopping structure, the rotating bracket is fixedly connected to the motor output shaft, the braking pawl is rotatably connected to one of the inertia ring and the rotating bracket, and the remaining one component is also connected to the braking pawl and leaves an allowance at the connection between the remaining one component and the braking pawl;

after the motor is powered off, the rotating speed of the output shaft of the motor is gradually reduced, the inertia ring and the output shaft of the motor rotate relatively under the action of self inertia and push or pull the brake pawl to drive the brake pawl to rotate, so that the stop structure on the brake pawl is close to and abutted against the stop structure on the fixed part, and the rotation of the output shaft of the motor is prevented.

In one embodiment, the inertia ring is positioned outside the rotating bracket, the rotating bracket is provided with an accommodating cavity, the stop structure on the fixed part is positioned in the accommodating cavity, the brake pawl is rotatably connected to the inertia ring through a pin shaft, the side wall of the rotating bracket is provided with a notch communicated with the accommodating cavity, the front section of the arm pawl of the brake pawl extends into the notch and is spaced from the side wall of the notch, the stop structure on the brake pawl is the front end of the arm pawl, and the stop structure on the fixed part is a bump or a groove;

after the motor is powered off, the rotating speed of the output shaft of the motor is gradually reduced, the inertia ring and the output shaft of the motor rotate relatively under the action of self inertia and pull the brake pawl to drive the brake pawl to rotate, so that the front end of the arm pawl of the brake pawl extends out of the notch and abuts against a lug or a groove on the fixed part, and the rotation of the output shaft of the motor is prevented.

Further, the fixed part comprises a static ring positioned in the accommodating cavity, and the convex block or the groove is arranged on the outer peripheral surface of the static ring.

In another embodiment, an accommodating cavity is formed in the rotating bracket, the inertia ring is arranged in the accommodating cavity, a stop structure on the fixed part is positioned outside the rotating bracket, the braking claw is rotatably connected to the rotating bracket through a pin shaft, a notch communicated with the accommodating cavity is formed in the side wall of the rotating bracket, a connecting groove is formed in the side wall of the inertia ring, the front arm claw section of the braking claw extends into the notch and leaves a gap with the side wall of the notch, the rear arm claw section of the braking claw is inserted into the connecting groove and leaves a gap with the side wall of the connecting groove, the stop structure on the braking claw is the front end of the arm claw, and the stop structure on the fixed part is a bump or a groove;

after the motor is powered off, the rotating speed of the output shaft of the motor is gradually reduced, the inertia ring and the output shaft of the motor generate relative rotation under the action of self inertia and push against the braking claw, so that the braking claw is driven to rotate, the front end of the arm claw of the braking claw extends out of the notch and abuts against a convex block or a groove on the fixed part, and the rotation of the output shaft of the motor is prevented.

Further, the fixed member includes a stationary ring surrounding the outside of the rotating bracket, and the protrusions or the grooves are provided on an inner circumferential surface of the stationary ring.

The utility model discloses a setting is by the drive of motor output shaft and can produce relative pivoted inertia part with motor output shaft when motor output shaft rotational speed changes, after the motor loses the electricity (motor output shaft rotational speed reduces gradually this moment) inertia part can produce relative rotation and push up or pull the moving part at self inertia effect and motor output shaft like this, make the detent structure who sets up on the moving part support and lean on the detent structure who sets up on living immobile piece (immobile piece is the part that does not receive motor output shaft drive and keep quiescent condition always in motor operation process), produce the braking force with this and prevent motor output shaft and rotate. The motor positioning and stopping mechanism for the electric double-head rolling toothbrush can position and stop the output shaft of the motor at a set position (namely the position of the output shaft of the motor when the stop structures on the movable part and the fixed part abut against each other), adopts a pure mechanical structure, does not have any electric element, has a very simple and compact integral structure and low cost, and is particularly suitable for electric appliances which have small internal space, high rotating speed and are inconvenient to control by a travel switch and a servo motor like the electric toothbrush.

Drawings

FIG. 1 is a schematic view of a prior art document powered two head-on-roll toothbrush with two head bodies in a staggered non-flush position;

FIG. 2 is a schematic external view showing a motor positioning stop mechanism for the electric two-head roll toothbrush according to embodiment 1;

FIG. 3 is a schematic view showing the internal structure of the motor positioning and stopping mechanism for the electric two-head rolling toothbrush shown in FIG. 2;

FIGS. 4-6 are schematic views showing the connection of the inertia ring and the movable ring to the output shaft of the motor in the motor positioning and stopping mechanism for the electric two-head rolling toothbrush shown in FIG. 3;

FIG. 7 is a partial enlarged view of portion A of FIG. 3;

FIG. 8 is an external view showing the structure of a motor position stop mechanism for the electric two-head roll toothbrush in embodiment 2;

FIG. 9 is a schematic view showing the internal structure of the motor positioning and stopping mechanism for the electric two-head rolling toothbrush shown in FIG. 8;

FIGS. 10-12 are schematic perspective views of the rotary bracket, the inertia ring, and the locking pawl, respectively, of the motor positioning and stopping mechanism for the electric two-head rolling toothbrush of FIG. 8;

FIG. 13 is an external view showing the structure of a motor position stop mechanism for the electric two-head roll toothbrush in embodiment 3;

FIG. 14 is a schematic view showing the internal structure of the motor positioning stop mechanism for the electric two-head rolling toothbrush shown in FIG. 13;

FIGS. 15-18 are schematic perspective views of the rotary bracket, stationary ring, inertia ring and locking pawl, respectively, of the motor positioning and stopping mechanism for the electric two-head rolling toothbrush of FIG. 14;

in the figure:

1-inertia part 2-immovable part 3-movable part

4-convex tooth 5-convex block 1 a-inertia ring

2 a-static ring 3 a-movable ring 3 b-rotary support

3 c-brake pawl 1a 1-connecting groove 3b 1-containing cavity

3b2 notch 10 brush head body.

Detailed Description

In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In order to facilitate a better understanding of the improvements of the present invention for those skilled in the art, the present invention will be further described with reference to the accompanying drawings and 3 embodiments.

It should be noted in advance that the following 3 embodiments are all based on the following technical ideas: referring to fig. 3, 9 and 14, the motor positioning and stopping mechanism for the electric double-head roll toothbrush in the figures is used for positioning and stopping a motor output shaft for transmitting torque at a set position, and includes a braking assembly and an inertia component 1, specifically, the braking assembly includes a stationary component 2 which remains stationary during the operation of the motor and a movable component 3 connected with the motor output shaft, the stationary component 2 and the movable component 3 are provided with mutually matched stopping structures, the inertia component 1 and the movable component 3 are both driven by the motor output shaft to rotate, and the inertia component 1 and the motor output shaft can generate relative rotation due to the self inertia effect when the rotation speed of the motor output shaft changes. For safety and durability reasons, in the following 3 embodiments, the inertial member 1 and the movable member 3 are both mounted in the inner cavity of the toothbrush housing. The working principle of the motor positioning and stopping mechanism for the electric double-head rolling toothbrush is as follows: when the motor is powered off, the rotating speed of the output shaft of the motor is gradually reduced, the inertia component 1 rotates relative to the output shaft of the motor under the action of self inertia, then pushes or pulls the moving part 3, and prompts the stop structure of the moving part 3 to be close to the stop structure of the fixed part 2, and the stop structure of the moving part 3 abuts against the stop structure of the fixed part 2 to prevent the output shaft of the motor from rotating.

Example 1:

as shown in fig. 1 to 6, in the motor positioning and stopping mechanism for an electric two-head rolling toothbrush of the present embodiment, the inertia component 1 includes an inertia ring 1a sleeved on the motor output shaft, the inertia ring 1a is provided with a connecting through hole, a spiral protrusion or recess structure is provided on a hole wall of the connecting through hole, and is connected with the motor output shaft passing through the connecting through hole through the spiral protrusion or recess structure, the movable member 3 includes a movable ring 3a connected to the motor output shaft and constrained to move only along an axial direction of the motor output shaft, and a stop structure is provided on the movable ring 3 a. After the motor is powered off, the rotating speed of the output shaft of the motor is gradually reduced, the inertia ring 1a rotates relative to the output shaft of the motor under the action of self inertia and moves along the axial direction of the output shaft of the motor to lean against the movable ring 3a while rotating around the output shaft of the motor under the action of a spiral protruding or sunken structure, the movable ring 3a is pushed by the inertia ring 1a to approach the stop structure of the fixed part 2 along the axial direction of the output shaft of the motor, and the stop structure on the movable ring 3a is abutted against the stop structure on the fixed part 2, so that the rotation of the output shaft of the motor is prevented.

In practical application, in order to avoid the movable ring 3a from shaking along the axis direction of the motor output shaft, the movable ring 3a or the inertia ring 1a is preferably provided with magnetism or provided with a hanging buckle, so that the movable ring 3a and the inertia ring 1a can be connected through magnetic attraction or movably connected through the hanging buckle, and meanwhile, the inertia ring 1a can rotate 360 degrees relative to the movable ring 3 a.

In addition, the stop structure can be the convex teeth 4 or friction plates arranged on the fixed member 2 and the movable ring 3a shown in fig. 7, and the convex teeth 4 or friction plates on the fixed member 2 and the convex teeth 4 or friction plates on the movable ring 3a are abutted together to form a braking force to prevent the motor output shaft from rotating.

In this embodiment, a key (for example, a flat key or a spline) for connecting the output shaft of the motor may be provided on the movable ring 3a, and the movable ring 3a is restrained by the key so as to move only in the axial direction of the output shaft of the motor, and the teeth 4 or the friction plates on the movable ring 3a are preferably provided on the top end surface of the movable ring 3a, and the teeth 4 or the friction plates on the stationary member are located directly above the movable ring 3a, so that the inertia ring 1a pushes the movable ring 3a to move upward in the axial direction of the output shaft of the motor, and the teeth 4 or the friction plates on the top end of the movable ring 3a and the teeth 4 or the friction plates on the stationary member 2 can abut against each other.

Compared with the embodiments 2 and 3 to be mentioned below, the motor positioning stop mechanism for the electric two-head rolling toothbrush in the present embodiment has a simpler structure and a more compact structure.

Example 2:

unlike embodiment 1, as shown in fig. 8-12, in this embodiment, the inertia member 1 includes an inertia ring 1a sleeved outside the output shaft of the motor, the movable element 3 includes a rotating bracket 3b and a detent 3c provided with a stopping structure, the rotating bracket 3b is fixedly connected with the output shaft of the motor, the detent 3c is rotatably connected with one of the two parts of the inertia ring 1a and the rotating bracket 3b, and the remaining part is also connected with the detent 3c and has an allowance at the connection part with the detent 3 c. When the motor is powered off, the rotating speed of the output shaft of the motor is gradually reduced, the inertia ring 1a rotates relative to the output shaft of the motor under the action of self inertia and pulls the braking claw 3c to drive the braking claw 3c to rotate, so that the stopping structure on the braking claw 3c is close to and abutted against the stopping structure on the fixed part 2, and the rotation of the output shaft of the motor is prevented.

Specifically, the inertia ring 1a in this embodiment is disposed at a position outside the rotating bracket 3b, the rotating bracket 3b is provided with an accommodating cavity 3b1, the stop structure on the stationary member 2 is located in the accommodating cavity 3b1, the detent 3c is rotatably connected to the inertia ring 1a through a pin, a notch 3b2 communicating with the accommodating cavity 3b1 is formed in a side wall of the rotating bracket 3b, a front arm-claw section of the detent 3c extends into the notch 3b2 and leaves a gap with a side wall of the notch 3b2, the stop structure on the detent 3c is a front arm-claw end thereof, and the stop structure on the stationary member 2 is a protrusion 5 (or a groove). After the motor is powered off, the pulling action of the inertia ring 1a on the braking claw 3c causes the braking claw 3c to rotate, so that the arm claw front end of the braking claw 3c extends out of the notch 3b2 and is abutted with the bump 5 or the groove on the fixed piece 2, and the rotation of the output shaft of the motor is prevented. In addition, as shown in fig. 9, the stationary member 2 includes a stationary ring 2a located in the accommodation chamber 3b1, and the projection 5 or the groove is provided on the outer circumferential surface of the stationary ring 2 a. It should be noted that the stationary ring 2a is not driven by the output shaft of the motor and remains stationary during operation of the motor, and in practical applications, it may be fixedly attached to the housing of the motor.

Example 3:

similar to embodiment 2, the inertia element 1 in this embodiment also includes an inertia ring 1a sleeved outside the motor output shaft, the movable element 3 also includes a rotating bracket 3b and a detent 3c provided with a detent structure, the rotating bracket 3b is also fixedly connected to the motor output shaft, and an accommodating cavity 3b1 is also provided in the rotating bracket 3b, a notch 3b2 communicating with the accommodating cavity 3b1 is also provided on the side wall of the rotating bracket 3b, the detent structure on the detent 3c is also the front end of the arm claw thereof, in addition, the stationary element 2 may also include a stationary ring 2a, and the detent structure on the stationary element 2 is also a protrusion 5 (of course, a groove) provided on the stationary ring 2 a. The present embodiment is different from embodiment 2 mainly in that: the inertia ring 1a is arranged in the accommodating cavity 3b1, the static ring 2a is arranged outside the rotating bracket 3b, correspondingly, the projection 5 is arranged on the inner circumferential surface of the static ring 2a, the braking claw 3c is rotatably connected on the rotating bracket 3b through a pin shaft, the connecting groove 1a1 is arranged on the side wall of the inertia ring 1a, the front arm claw section of the braking claw 3c extends into the notch 3b2 and has a gap with the side wall of the notch 3b2, and the rear arm claw section of the braking claw 3c is inserted into the connecting groove 1a1 and has a gap with the side wall of the connecting groove 1a 1. The working principle of the motor positioning and stopping mechanism for the electric double-head rolling toothbrush in the embodiment is as follows: after the motor is powered off, the rotating speed of the output shaft of the motor is gradually reduced, the inertia ring 1a rotates relative to the output shaft of the motor under the action of self inertia and pushes against the braking claw 3c, so that the braking claw 3c is driven to rotate, the front end of the arm claw of the braking claw 3c extends out of the notch 3b2 and is abutted against the bump 5 on the inner circumferential surface of the static ring 2a, and the rotation of the output shaft of the motor is prevented.

In the above embodiments 1 to 3, the inertia member 1 is driven by the output shaft of the motor and rotates relative to the output shaft of the motor when the rotation speed of the output shaft of the motor changes, so that after the motor loses power (at this time, the rotation speed of the output shaft of the motor gradually decreases), the inertia member 1 rotates relative to the output shaft of the motor under the action of its own inertia, thereby pushing or pulling the movable member 3, and causing the stop structure provided on the movable member 3 to abut against the stop structure provided on the stationary member 2, thereby generating the braking force to stop the rotation of the output shaft of the motor. The motor positioning and stopping mechanism in the above embodiment can position and stop the motor output shaft at a set position (i.e. the position of the motor output shaft when the movable part 3 abuts against the stop structure on the stationary part 2), and the whole structure adopts a pure mechanical structure, has no any electric element, has a very simple and compact structure and low cost, and is particularly suitable for electric appliances such as an electric toothbrush, which have small internal space, high rotating speed and are inconvenient to control by a travel switch and a servo motor.

The above-mentioned embodiment is the utility model discloses the implementation scheme of preferred, in addition, the utility model discloses can also realize by other modes, any obvious replacement is all within the protection scope of the utility model under the prerequisite that does not deviate from this technical scheme design.

In order to make it easier for those skilled in the art to understand the improvement of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and in order to clarify, some other elements have been omitted from this document, those skilled in the art should recognize that these omitted elements may also constitute the content of the present invention.

Claims (10)

1. A motor location stop gear for electronic double-end to roll toothbrush for stop the motor output shaft location in the position of settlement, its characterized in that: the toothbrush comprises a braking component and an inertia component (1), wherein the braking component comprises a fixed part (2) which keeps still in the running process of a motor and a movable part (3) connected with an output shaft of the motor, the fixed part (2) and the movable part (3) are provided with mutually matched stop structures, the inertia component (1) and the movable part (3) are driven by the output shaft of the motor to rotate, the inertia component (1) can generate relative rotation with the output shaft of the motor due to the self inertia effect when the rotating speed of the output shaft of the motor changes, and the inertia component (1) and the movable part (3) are arranged in an inner cavity of a toothbrush outer shell;

after the motor is powered off, the rotating speed of the output shaft of the motor is gradually reduced, the inertia component (1) rotates relative to the output shaft of the motor due to the self inertia effect, then the moving part (3) is pushed or pulled, the stop structure of the moving part (3) is promoted to be close to the stop structure of the fixed part (2), and the stop structure of the moving part (3) abuts against the stop structure of the fixed part (2) to prevent the output shaft of the motor from rotating.

2. The motor position stop mechanism for a power twin-head rolling toothbrush of claim 1, wherein: the inertia component (1) comprises an inertia ring (1 a) sleeved on the motor output shaft, a connecting through hole is formed in the inertia ring (1 a), a spiral protruding or recessed structure is arranged on the hole wall of the connecting through hole and is connected with the motor output shaft penetrating through the connecting through hole through the spiral protruding or recessed structure, the moving part (3) comprises a movable ring (3 a) connected to the motor output shaft and constrained to move only along the axis direction of the motor output shaft, and a stop structure is arranged on the movable ring (3 a);

after the motor is powered off, the rotating speed of the output shaft of the motor is gradually reduced, the inertia ring (1 a) rotates relative to the output shaft of the motor under the action of self inertia and moves along the axial direction of the output shaft of the motor while rotating around the output shaft of the motor under the action of a spiral protruding or sunken structure, the movable ring (3 a) is pushed by the inertia ring (1 a) to be close to the stop structure of the fixed part (2) along the axial direction of the output shaft of the motor, and the stop structure on the movable ring (3 a) is abutted against the stop structure on the fixed part (2) so as to prevent the output shaft of the motor from rotating.

3. The motor position stop mechanism for a power twin-head rolling toothbrush of claim 2, wherein: the movable ring (3 a) or the inertia ring (1 a) is provided with magnetism or is provided with a hanging buckle, the movable ring (3 a) is magnetically attracted with the inertia ring (1 a) or is movably connected with the inertia ring through the hanging buckle, and the inertia ring (1 a) can rotate 360 degrees relative to the movable ring (3 a).

4. A motor positioning stop mechanism for a power twin-head rolling toothbrush according to claim 2 or 3, characterized in that: the stopping structure comprises convex teeth (4) or friction plates arranged on a fixed part (2) and a movable ring (3 a), and the convex teeth (4) or the friction plates on the fixed part (2) and the convex teeth (4) or the friction plates on the movable ring (3 a) are abutted together to form braking force to prevent the rotation of the output shaft of the motor.

5. The motor position stop mechanism for a power twin-head rolling toothbrush of claim 4, wherein: the novel motor is characterized in that a key used for being connected with a motor output shaft is arranged on the movable ring (3 a), the movable ring (3 a) is restrained by the key to move only along the axis direction of the motor output shaft, the convex teeth (4) or the friction plates on the movable ring (3 a) are arranged on the top end face of the movable ring (3 a), the convex teeth (4) or the friction plates on the fixed part are located right above the movable ring (3 a), the inertia ring (1 a) pushes the movable ring (3 a) to move upwards along the axial direction of the motor output shaft, and therefore the convex teeth (4) or the friction plates on the top end of the movable ring (3 a) and the convex teeth (4) or the friction plates arranged on the fixed part (2) are abutted together.

6. The motor position stop mechanism for a power twin-head rolling toothbrush of claim 1, wherein: the inertia part (1) comprises an inertia ring (1 a) sleeved outside an output shaft of the motor, the movable part (3) comprises a rotating bracket (3 b) and a braking claw (3 c) provided with a stopping structure, the rotating bracket (3 b) is fixedly connected with the output shaft of the motor, the braking claw (3 c) is rotatably connected to one of the inertia ring (1 a) and the rotating bracket (3 b), and the rest part is also connected with the braking claw (3 c) and has an allowance at the connection part of the rest part and the braking claw (3 c);

after the motor is powered off, the rotating speed of the output shaft of the motor is gradually reduced, the inertia ring (1 a) and the output shaft of the motor generate relative rotation under the action of self inertia and push or pull the brake claw (3 c), so that the brake claw (3 c) is driven to rotate, the stop structure on the brake claw (3 c) is close to and abutted against the stop structure on the fixed part (2), and the rotation of the output shaft of the motor is prevented.

7. The motor position stop mechanism for a power twin-head rolling toothbrush of claim 6, wherein: the inertia ring (1 a) is located on the outer side of the rotating support (3 b), an accommodating cavity (3 b 1) is arranged in the rotating support (3 b), a stop structure on the immovable part (2) is located in the accommodating cavity (3 b 1), the braking claw (3 c) is rotatably connected to the inertia ring (1 a) through a pin shaft, a notch (3 b 2) communicated with the accommodating cavity (3 b 1) is formed in the side wall of the rotating support (3 b), the front section of the arm claw of the braking claw (3 c) extends into the notch (3 b 2) and is spaced from the side wall of the notch (3 b 2), the stop structure on the braking claw (3 c) is the front end of the arm claw, and the stop structure on the immovable part (2) is a bump (5) or a groove;

after the motor is powered off, the rotating speed of the output shaft of the motor is gradually reduced, the inertia ring (1 a) rotates relative to the output shaft of the motor due to the inertia effect of the inertia ring and pulls the brake claw (3 c), so that the brake claw (3 c) is driven to rotate, the front end of the arm claw of the brake claw (3 c) extends out of the notch (3 b 2) and abuts against the bump (5) or the groove on the fixed part (2), and the rotation of the output shaft of the motor is prevented.

8. The motor position stop mechanism for a power twin-head rolling toothbrush of claim 7, wherein: the fixed part (2) comprises a static ring (2 a) positioned in the accommodating cavity (3 b 1), and the convex block (5) or the groove is arranged on the outer peripheral surface of the static ring (2 a).

9. The motor position stop mechanism for a power twin-head rolling toothbrush of claim 6, wherein: the rotating bracket (3 b) is internally provided with an accommodating cavity (3 b 1), the inertia ring (1 a) is arranged in the accommodating cavity (3 b 1), the stop structure on the immovable part (2) is positioned on the outer side of the rotating bracket (3 b), the braking claw (3 c) is rotatably connected onto the rotating bracket (3 b) through a pin shaft, the side wall of the rotating bracket (3 b) is provided with a notch (3 b 2) communicated with the accommodating cavity (3 b 1), the side wall of the inertia ring (1 a) is provided with a connecting groove (1 a 1), the front arm claw section of the braking claw (3 c) extends into the notch (3 b 2) and leaves a gap with the side wall of the notch (3 b 2), the rear arm claw section of the braking claw (3 c) is inserted into the connecting groove (1 a 1) and leaves a gap with the side wall of the connecting groove (1 a 1), the stop structure on the braking claw (3 c) is the front arm end, the stop structure on the fixed part (2) is a convex block (5) or a groove;

after the motor is powered off, the rotating speed of the output shaft of the motor is gradually reduced, the inertia ring (1 a) rotates relative to the output shaft of the motor due to the inertia effect of the inertia ring and pushes against the braking claw (3 c), so that the braking claw (3 c) is driven to rotate, the front end of the arm claw of the braking claw (3 c) extends out of the notch (3 b 2) and abuts against the convex block (5) or the groove on the fixed part (2), and the rotation of the output shaft of the motor is prevented.

10. The motor position stop mechanism for a power twin-head rolling toothbrush of claim 9, wherein: the fixed part (2) comprises a static ring (2 a) surrounding the outer side of the rotating bracket (3 b), and the convex blocks (5) or the grooves are arranged on the inner circumferential surface of the static ring (2 a).

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