A three-axis rotary transmission mechanism and an electric toothbrush

Abstract

The utility model discloses a three -axis rotary transmission mechanism and electric toothbrush, including power shaft, swing piece, transmission shaft and elastic part, and transmission shaft passes through transmission subassembly power shaft transmission connection. The utility model discloses through power shaft and transmits power to left swing piece and right swing piece respectively through transmission subassembly, makes transmission shaft on left swing piece with transmission shaft on right swing piece synchronous reverse movement, simultaneously, rely on the elastic part of connection between left swing piece and right swing piece, to make left swing piece and right swing piece can carry out relative movement to adjust transmission shaft interval on it, to realize three axle synchronous rotation can still carry out interval adjustment, effectively improve its applicability, and effectively improve the comfort of electric toothbrush of using this transmission mechanism. In addition, through this transmission mechanism can make two transmission shafts on swing piece bring to brush head and carry out directional rotation, can realize the unidirectional complex brushing of the bristle of brush head from gum to the direction of tooth tip, do not reverse, do not hurt gum.

Description

Technical Field

[0001] This utility model relates to the field of electric toothbrush technology, specifically a three-axis rotary transmission mechanism. Background Technology

[0002] The focus of oral hygiene is tooth care and maintenance. Improper tooth care not only causes pain but also unnecessary financial losses (the cost of a single tooth repair is around 600, while the cost of a complete dental implant procedure is approximately 300,000). Traditional toothbrushes require several minutes of manual brushing, repeatedly brushing from the root to the crown, about 30 times per tooth to achieve a clean effect, which is time-consuming and laborious. Because teeth are often not thoroughly cleaned, many adults require more than one tooth repair or implantation. Furthermore, incorrect brushing techniques can damage the gums, leading to gum recession and exposed tooth roots. Therefore, current technology addresses these problems with electric toothbrushes featuring a multi-brush structure.

[0003] For example, a three-axis electric toothbrush with publication number CN220404184U includes a shell and brush head structure. The brush head structure includes a brush holder fixed to the upper end of the shell, and three brush bodies are provided on the brush holder. The upper ends of each brush body are rotatably connected to the upper end of the brush holder, and the lower ends of each brush body are fixedly connected to the upper end of a brush shaft. The lower end of the brush shaft passes through a through hole in the shell and extends into the interior of the shell. The shell contains a drive motor, a control board, and a battery. The drive motor is connected to the brush shaft via a transmission mechanism, and both the drive motor and the battery are connected to the control board. The control board is connected to a control switch, which is located on the shell. In this invention, the three brush bodies are each connected to a transmission mechanism via a brush shaft, and a drive motor is connected to the transmission mechanism. When the drive motor rotates, it can simultaneously drive the three brush bodies to rotate, thus enabling simultaneous cleaning of all five surfaces of the teeth during use, resulting in fast, efficient, and scientifically sound teeth cleaning.

[0004] The aforementioned three-axis electric toothbrush can effectively clean multiple surfaces of teeth. However, the exposed brush shaft used to drive the brush body rotation causes it to be in prolonged contact with the lips during use. Since the brush shaft is constantly rotating during use and in constant contact with the lips, it can cause significant discomfort to the user. Therefore, this application proposes a three-axis rotary transmission mechanism and electric toothbrush that provides greater comfort and effectively avoids the exposure of the brush shaft. Utility Model Content

[0005] The purpose of this invention is to propose a three-axis rotary transmission mechanism and an electric toothbrush to solve the problem of the exposed brush shaft of the aforementioned three-axis electric toothbrush affecting user comfort.

[0006] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a three-axis rotary transmission mechanism, comprising: A power shaft has an input end that connects to a power source and an output end for power transmission. The swing element is arranged on both sides of the power shaft along the axial direction of the power shaft and rotates around the axis of the power shaft; The drive shaft is rotatably mounted on the swinging member and is connected to the power shaft through a transmission assembly, so that the two drive shafts rotate synchronously in opposite directions on the swinging member. An elastic element is disposed between the oscillating elements along the axial direction of the power shaft so that the oscillating elements can oscillate elastically on the power shaft.

[0007] Preferably, the swing member includes a left swing member and a right swing member, the transmission assembly includes a left transmission assembly and a right transmission assembly, and the transmission shaft includes a left transmission shaft and a right transmission shaft. The left transmission shaft and the left transmission assembly are disposed inside the left swing member, and the right transmission shaft and the right transmission assembly are disposed inside the right swing member. The left transmission shaft is connected to the power shaft through the left transmission assembly, and the right transmission shaft is connected to the power shaft through the right transmission assembly.

[0008] Preferably, the left transmission assembly includes a left drive gear, a left timing belt, and a left transmission gear. The left drive gear is coaxially connected to the power shaft, and the left transmission gear is rotatably disposed within the left swing member. The left timing belt is sleeved on the left drive gear and the left transmission gear. The left transmission shaft is provided with a driven gear that meshes with the left transmission gear.

[0009] Preferably, the right drive assembly includes a right drive gear, a right timing belt, and a right transmission gear. The right drive gear is coaxially connected to the power shaft and located below the left drive gear. The right transmission gear is coaxially connected to the end of the right transmission shaft. The right timing belt is sleeved on the right drive gear and the right transmission gear.

[0010] Preferably, the left drive gear includes two coaxially connected ring gear one and ring gear two. The left synchronous belt is sleeved on ring gear one, and ring gear two meshes with the driven gear for transmission. Several guide bushings for guiding the left and right synchronous belts are rotatably arranged inside the left and right swing members.

[0011] Preferably, the left swinging component includes a left wheel box one and a left wheel box two, and the right swinging component includes a right wheel box one and a right wheel box two. The right wheel box one has an annular groove at its end, and the elastic element is a torsion spring. The torsion spring is sleeved in the annular groove, with one end of the torsion spring inserted into the annular groove and the other end of the torsion spring inserted into the lower end face of the left wheel box two.

[0012] Preferably, an arc-shaped limiting groove is provided in the annular groove, and a limiting protrusion is provided on the left wheel box II, with the limiting protrusion located in the arc-shaped limiting groove.

[0013] A three-axis rotary electric toothbrush includes the aforementioned three-axis rotary transmission mechanism, and further includes: The brush heads are respectively inserted into the output end of the power shaft and the drive shaft; The handle is rotatably connected to the drive shaft and to the lower end of the right wheel box. The motor is located inside the handle and is connected to the drive shaft.

[0014] Preferably, the three-axis rotary electric toothbrush further includes a left limiting component and a right limiting component, one end of which is rotatably connected to the upper part of the brush head on the power shaft, and the other end of which is rotatably connected to the upper part of the brush head on the transmission shaft.

[0015] Preferably, a sleeve is provided at the lower end of the right wheel box, a limiting element is provided on the sleeve, and a guide limiting groove is provided on the end of the handle. The limiting element passes through the sleeve so that its end is located in the guide limiting groove, so as to limit the rotation of the sleeve fitted on the end of the handle.

[0016] Preferably, a rechargeable battery is provided inside the handle to provide power to the motor, enabling the motor to operate for extended periods. Alternatively, a battery slot can be provided inside the handle for periodic replacement of removable AA batteries; this method is non-rechargeable.

[0017] Preferably, the handle is equipped with a power button and a speed control button for controlling the motor speed, so as to control the output speed of the power shaft and thus adjust the speed of the three brush heads to rotate synchronously.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention transmits power to the left and right swing components via a power shaft and transmission assembly, causing the transmission shafts on the left and right swing components to move synchronously and in opposite directions. Simultaneously, an elastic element connecting the left and right swing components allows for relative movement, adjusting the distance between their transmission shafts. This achieves synchronous rotation of all three shafts while allowing for spacing adjustment, effectively improving its applicability and comfort. Furthermore, this transmission mechanism enables the two transmission shafts on the swing components to rotate the brush head in a directional manner, achieving unidirectional brushing from the gums to the tooth tips without reversing direction or damaging the gums. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is an exploded view of the three-axis rotary transmission mechanism of this utility model. Figure 2 This is a schematic diagram of the three-axis rotary transmission mechanism of this utility model; Figure 3 This is a schematic diagram of the transmission component of this utility model; Figure 4 This is a transmission diagram of the left and right transmission components of this utility model; Figure 5 This is a schematic diagram of the interior of the left wheel box II and the right wheel box II of this utility model; Figure 6 This is a schematic diagram of the interior of the left wheel box and the right wheel box of this utility model; Figure 7 This is a schematic diagram of the right-swinging component and the elastic component of this utility model; Figure 8 This is a schematic diagram of the left swinging component and the elastic component of this utility model; Figure 9 A schematic diagram showing the location of the torsion spring according to this utility model; Figure 10 This is a schematic diagram of a three-axis rotary electric toothbrush according to the present invention; Figure 11 This is a schematic diagram of the rear of a three-axis rotary electric toothbrush according to the present invention. Figure 12 This is a schematic diagram showing the cooperation between the motor and the drive shaft of this utility model; Figure 13 This is a partial cross-sectional view of the electric toothbrush of this utility model; Figure 14 for Figure 13 Enlarged view of point A in the middle; Figure 15 This is a schematic diagram of the various guide and limiting grooves of this utility model.

[0021] In the diagram: 1-Power shaft; 11-Input end; 12-Output end; 2-Swing component; 21-Left swing component; 211-Left wheel box one; 212-Left wheel box two; 213-Limiting protrusion; 22-Right swing component; 221-Right wheel box one; 222-Right wheel box two; 223-Annular groove; 224-Arc-shaped limiting groove; 225-Sleeve; 2251-Limiting component; 3-Drive shaft; 31-Left drive shaft; 32-Right drive shaft; 4-Transmission assembly; 41-Left transmission assembly; 411-Left drive gear; 412-Left synchronous belt; 413-Left transmission gear; 4131-Ring gear one; 4132-Ring gear two; 414-Driven gear; 42-Right transmission assembly; 421-Right drive gear; 422-Right synchronous belt; 423-Right transmission gear; 43-Guide bushing; 5-Elastic element; 6-Brush head; 7-Handle; 71-Guide limiting groove; 8-Motor; 81-Connecting sleeve; 82-Bearing; 9-Left limit ornament; 10 - Right limit ornament. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example 1: like Figures 1 to 9 As shown, this utility model provides a three-axis rotary transmission mechanism, including: The power shaft 1 has an input end 11 connected to a power source and an output end 12 for power transmission; The swing element 2 is arranged on both sides of the power shaft 1 along the axial direction of the power shaft 1 and rotates around the axis of the power shaft 1; The drive shaft 3 is rotatably mounted on the swing member 2 and is connected to the power shaft 1 through the transmission assembly 4, so that the two drive shafts 3 rotate synchronously in opposite directions on the swing member 2. The elastic element 5 is arranged axially between the swinging elements 2 along the power shaft 1 so that the swinging elements 2 can swing elastically on the power shaft 1, thereby adjusting the distance between the transmission shafts 3 on them by swinging relative to each other.

[0024] See Figures 1 to 6 The swing member 2 includes a left swing member 21 and a right swing member 22, which are V-shaped or L-shaped structures, so that the left swing member 21 and the right swing member 22 form a V-shaped, U-shaped, or W-shaped structure. The transmission assembly 4 includes a left transmission assembly 41 and a right transmission assembly 42, and the transmission shaft 3 includes a left transmission shaft 31 and a right transmission shaft 32. The left transmission shaft 31 and the left transmission assembly 41 are disposed within the left swing member 21, and the right transmission shaft 32 and the right transmission assembly 42 are disposed within the right swing member 22.

[0025] The left drive shaft 31 is connected to the power shaft 1 via the left drive assembly 41 to drive the left drive shaft 31 to rotate at the end of the left swing member 21. The right drive shaft 32 is connected to the power shaft 1 via the right drive assembly 42 to drive the right drive shaft 32 to rotate at the end of the right swing member 22.

[0026] See Figure 1 , Figure 3 and Figure 4 The left transmission assembly 41 includes a left drive gear 411, a left synchronous belt 412, and a left transmission gear 413. The left drive gear 411 is coaxially connected to the power shaft 1, and the left transmission gear 413 is rotatably disposed inside the left swing member 21. The left synchronous belt 412 is sleeved on the left drive gear 411 and the left transmission gear 413. The left transmission shaft 31 is provided with a driven gear 414 that meshes with the left transmission gear 413, so that the transmission shaft 3 on the left swing member 21 and the power shaft 1 can rotate synchronously in opposite directions through the driven gear 414 meshing with the left transmission gear 413.

[0027] See Figure 1 , Figure 3 and Figure 4 The right transmission assembly 42 includes a right drive gear 421, a right synchronous belt 422, and a right transmission gear 423. The right drive gear 421 is coaxially connected to the power shaft 1 and located below the left drive gear 411. The right transmission gear 423 is coaxially connected to the end of the right transmission shaft 32. The right synchronous belt 422 is sleeved on the right drive gear 421 and the right transmission gear 423 so that the transmission shaft 3 on the right swing member 22 and the power shaft 1 can rotate synchronously and in the same direction through the right transmission gear 423, so that the two transmission shafts 3 can rotate synchronously and in the same direction.

[0028] Furthermore, the left synchronous belt 412 and the right synchronous belt 422 are toothed belts, and their teeth mesh with the drive gear and the transmission gear, so that the two left drive gears 411 and the right drive gear 421 drive the left transmission gear 413 and the right transmission gear 423 to rotate, thereby driving the transmission shaft 3 to rotate.

[0029] See Figure 4 The left drive gear 413 includes two coaxially connected ring gears, a first ring gear 4131 and a second ring gear 4132. The left synchronous belt 412 is sleeved on the first ring gear 4131. The second ring gear 4132 meshes with the driven gear 414 for transmission. A limiting piece is provided between the first ring gear 4131 and the second ring gear 4132 to limit the driven gear 414, so as to prevent the driven gear 414 connected to the left drive shaft 31 from jumping in the end of the left swing member 21.

[0030] See Figure 3Several guide bushings 43 are rotatably provided inside the left swing member 21 and the right swing member 22 for guiding the left synchronous belt 412 and the right synchronous belt 422, so as to guide and tension the left synchronous belt 412 and the right synchronous belt 422 located inside the left swing member 21 and the right swing member 22.

[0031] Furthermore, limit plates are provided on the upper part of the left drive gear 411, the right transmission gear 423, and the guide sleeve 43 to limit the left synchronous belt 412 and the right synchronous belt 422.

[0032] The working principle of this embodiment: The input end 11 of the power shaft 1 receives an external power source to make the power shaft 1 rotate within the end of the swing member 2, and drives the transmission shaft 3 located at the end of the left swing member 21 to rotate synchronously in the opposite direction through the left transmission assembly 41. At the same time, the transmission shaft 3 located at the end of the right swing member 22 is driven to rotate synchronously through the right transmission assembly 42. The elastic member 5 connected between the left swing member 21 and the right swing member 22 allows the left swing member 21 and the right swing member 22 to move relative to each other under the action of external force to adjust the distance between the left transmission shaft 31 and the right transmission shaft 32.

[0033] Example 2: As another embodiment of this utility model, such as Figures 5 to 8 As shown, the left swing member 21 includes a left wheel box 1 211 and a left wheel box 2 212, and the right swing member 22 includes a right wheel box 1 221 and a right wheel box 2 222. The end of the right wheel box 1 221 is provided with an annular groove 223. The elastic member 5 is a torsion spring, which is sleeved in the annular groove 223. One end of the torsion spring is inserted into the annular groove 223, and the other end of the torsion spring is inserted into the lower end surface of the left wheel box 2 212.

[0034] Specifically, see Figure 5 and Figure 6 In this embodiment, the left wheel box 211 is provided with a plurality of circular bosses for limiting the guide bushing 43 and the left drive gear 413. The left wheel box 212 is also provided with a plurality of circular bosses for limiting the guide bushing 43 and the left drive gear 413. The left wheel box 212 is also provided with a circular groove. One end of the left drive shaft 31 is rotatably connected to the circular groove. The left drive shaft 31 can be stably rotated in the circular groove by setting a bearing 82. The left wheel box 211 is provided with a circular through hole vertically opposite to the circular groove so that the left drive shaft 31 can pass through.

[0035] See Figure 5 and Figure 6The right wheel box 222 is provided with multiple limiting rods for limiting the rotation of the guide sleeve 43 and a circular boss for limiting the rotation of the right drive gear 423. The right drive gear 423 is a ring gear structure and is mounted on the circular boss for easy rotation. The right wheel box 221 is provided with multiple circular grooves for inserting the limiting rods and a circular groove for inserting the right drive shaft 32. It is also provided with a circular through hole so that the right drive shaft 32 can pass through.

[0036] Further, see Figure 3 and Figure 5 The guide sleeve 43 is rotatably mounted on the circular boss and the limiting rod.

[0037] See Figures 7 to 9 An arc-shaped limiting groove 224 is provided in the annular groove 223, and a limiting protrusion 213 is provided on the left wheel box 212. The limiting protrusion 213 is located in the arc-shaped limiting groove 224. By setting the arc-shaped limiting groove 224 and the limiting protrusion 213, the swing angle between the left swing member 21 and the right swing member 22 is limited, so that the swing angle between the left swing member 21 and the right swing member 22 is within the range of 90°.

[0038] Specifically, the drive shaft 3 and power shaft 1 of this utility model are provided with sealing rings at the rotational connection points with the swing member 2 to prevent water from flowing into the swing member 2.

[0039] like Figures 10 to 14 As shown, this utility model also discloses a three-axis rotary electric toothbrush, including the above-mentioned three-axis rotary transmission mechanism, and further comprising: The brush head 6 is inserted into the output end 12 of the power shaft 1 and the transmission shaft 3 respectively. It is provided with a insertion groove so that it can rotate together with the power shaft 1. The brush head 6 is a cylindrical structure and can be bristles distributed in a spiral structure or bristles distributed in multiple rows or columns. The handle 7 is rotatably connected to the power shaft 1 and rotatably or fixedly connected to the lower end of the right wheel box 222, so as to limit the lower swing member 2 through the handle 7, so as to avoid the problem of the swing member 2 rotating 360° on the handle 7. The motor 8 is located inside the handle 7 and is connected to the drive shaft 1. The motor 8 is connected to the input end 11 of the drive shaft 1 through the connecting sleeve 81 or the miniature coupling. The input end 11 of the drive shaft 1 is connected to the inner end of the handle 7 through the bearing 82. The bearing 82 can limit the axial movement of the drive shaft 1. The motor 8 can be a brushed DC motor, or other motors 8 specifically designed for electric toothbrushes can be used to work with the transmission mechanism.

[0040] See Figure 11The three-axis rotary electric toothbrush also includes a left limiting member 9 and a right limiting member 10. One end of the left limiting member 9 and the right limiting member 10 is rotatably connected to the upper part of the brush head 6 on the power shaft 1, and the other end of the left limiting member 9 and the right limiting member 10 is rotatably connected to the upper part of the brush head 6 on the transmission shaft 3, so as to limit and support the upper part of the brush head 6 by setting the left limiting member 9 and the right limiting member 10.

[0041] Furthermore, the left wheel box 211 and the right wheel box 221 can also be fixedly connected to the left limiting swing member 9 and the right limiting swing member 10 respectively via connecting rods. The two ends of the connecting rods are provided with threaded holes so that they can be fixed to the left wheel box 211 and the right wheel box 221 by bolts.

[0042] See Figure 12 and Figure 14 The lower end of the right wheel well 222 is provided with a sleeve 25, and a limiting member 2251 is provided on the sleeve 25. A guide limiting groove 71 is provided on the end of the handle 7. The limiting member 2251 passes through the sleeve 25 so that its end is located in the guide limiting groove 71, so as to limit the rotation of the sleeve 25 fitted on the end of the handle 7. Further, the limiting member 2251 is a screw or a pin, and its end is a hemispherical structure.

[0043] Furthermore, the guide limiting groove 71 is one of a T-shaped groove, an L-shaped groove, a circular groove, or a straight groove. When the guide limiting groove 71 is a circular groove, the sleeve 25 is fixed to the end of the handle 7; when the guide limiting groove 71 is a straight groove, the sleeve 25 can rotate at the end of the handle 7, and the range of rotation is the arc range formed by the straight groove and the axial direction of the handle 7.

[0044] See Figure 11 The handle 7 contains a rechargeable battery (not shown) to power the motor 8, enabling the motor 8 to operate continuously. Alternatively, a non-rechargeable battery can be used, with a battery slot within the handle 7 for periodic replacement of a removable AA battery.

[0045] See Figure 11 The handle 7 is equipped with a power button and a speed control button for controlling the speed of the motor 8, so as to control the output speed of the power shaft 1, thereby adjusting the speed of the three brush heads 6 to rotate synchronously. It also includes a circuit board (not shown), which is located inside the handle 7 and electrically connected to the buttons, the motor 8, and the battery or battery compartment to control the normal operation of the electric toothbrush. Since the circuit board used for controlling the electric toothbrush is a mature existing technology and product, its structure and circuit diagram will not be described in detail.

[0046] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A three-axis rotary transmission mechanism, characterized in that: include: The power shaft (1) has an input end (11) connected to a power source and an output end (12) for power transmission. The swing member (2) is arranged on both sides of the power shaft (1) along the axial direction of the power shaft (1) and rotates around the axis of the power shaft (1); The drive shaft (3) is rotatably mounted on the swing member (2) and is connected to the power shaft (1) via the transmission assembly (4) so ​​that the two drive shafts (3) rotate synchronously in opposite directions on the swing member (2); An elastic element (5) is disposed axially between the swinging elements (2) along the power shaft (1) so that the swinging elements (2) can swing elastically on the power shaft (1).

2. The three-axis rotary transmission mechanism as described in claim 1, characterized in that, The swing member (2) includes a left swing member (21) and a right swing member (22), the transmission assembly (4) includes a left transmission assembly (41) and a right transmission assembly (42), the transmission shaft (3) includes a left transmission shaft (31) and a right transmission shaft (32), the left transmission shaft (31) and the left transmission assembly (41) are disposed in the left swing member (21), and the right transmission shaft (32) and the right transmission assembly (42) are disposed in the right swing member (22); the left transmission shaft (31) is connected to the power shaft (1) through the left transmission assembly (41), and the right transmission shaft (32) is connected to the power shaft (1) through the right transmission assembly (42).

3. A three-axis rotary transmission mechanism as described in claim 2, characterized in that, The left transmission assembly (41) includes a left drive gear (411), a left timing belt (412), and a left transmission gear (413). The left drive gear (411) is coaxially connected to the power shaft (1). The left transmission gear (413) is rotatably disposed within the left swing member (21). The left timing belt (412) is sleeved on the left drive gear (411) and the left transmission gear (413). The left transmission shaft (31) is provided with a driven gear (414) that meshes with the left transmission gear (413).

4. A three-axis rotary transmission mechanism as described in claim 3, characterized in that, The right drive assembly (42) includes a right drive gear (421), a right timing belt (422), and a right transmission gear (423). The right drive gear (421) is coaxially connected to the power shaft (1) and located below the left drive gear (411). The right transmission gear (423) is coaxially connected to the end of the right drive shaft (32). The right timing belt (422) is sleeved on the right drive gear (421) and the right transmission gear (423).

5. A three-axis rotary transmission mechanism as described in claim 3, characterized in that, The left drive gear (413) includes two coaxially connected ring gear one (4131) and ring gear two (4132). The left synchronous belt (412) is sleeved on the ring gear one (4131). The ring gear two (4132) meshes with the driven gear (414) for transmission.

6. A three-axis rotary transmission mechanism as described in claim 4, characterized in that, The left swing member (21) and the right swing member (22) are rotatably provided with a plurality of guide bushings (43) for guiding the left synchronous belt (412) and the right synchronous belt (422).

7. A three-axis rotary transmission mechanism as described in claim 6, characterized in that, The left swing member (21) includes a left wheel box one (211) and a left wheel box two (212), and the right swing member (22) includes a right wheel box one (221) and a right wheel box two (222). The right wheel box one (221) has an annular groove (223) at its end. The elastic member (5) is a torsion spring. The torsion spring is sleeved in the annular groove (223). One end of the torsion spring is inserted into the annular groove (223), and the other end of the torsion spring is inserted into the lower end face of the left wheel box two (212).

8. A three-axis rotary transmission mechanism as described in claim 7, characterized in that, An arc-shaped limiting groove (224) is provided in the annular groove (223), and a limiting protrusion (213) is provided on the left wheel box (212), the limiting protrusion (213) being located in the arc-shaped limiting groove (224).

9. A three-axis rotary electric toothbrush, comprising the three-axis rotary transmission mechanism as described in claim 8, characterized in that, Also includes: The brush head (6) is respectively inserted into the output end (12) of the power shaft (1) and the transmission shaft (3); The handle (7) is rotatably connected to the power shaft (1) and connected to the lower end of the right wheel box (222); The motor (8) is located inside the handle (7) and is connected to the power shaft (1) for transmission.

10. A three-axis rotary electric toothbrush as described in claim 9, characterized in that, It also includes a left limiting ornament (9) and a right limiting ornament (10), one end of which is rotatably connected to the upper part of the brush head (6) on the power shaft (1), and the other end of which is rotatably connected to the upper part of the brush head (6) on the transmission shaft (3).

Images