Rotating mechanism and electric toothbrush

Abstract

A rotating mechanism and an electric toothbrush. The electric toothbrush comprises a motor (16), an eccentric wheel (17) provided on an output shaft of the motor (16), and a drive shaft (18), wherein the drive shaft (18) is provided with a brush head. A rotating drive mechanism comprises: a motor holder (10) for mounting the motor (16); a swing rod (11), a first end of which is rotationally connected to the motor holder (10); and a connecting rod assembly (12), which comprises a first connecting rod (121) and a second connecting rod (122), the first connecting rod (121) being rotationally connected to both a wheel axle of the eccentric wheel (17) and a second end of the swing rod (11), and the second connecting rod (122) being rotationally connected to both the drive shaft (18) and the second end of the swing rod (11). When the eccentric wheel (17) rotates, the swing rod (11) can be driven by means of the first connecting rod (121) to swing relative to the motor holder (10) within a preset angle range, and when the swing rod (11) swings, the drive shaft (18) is driven by means of the second connecting rod (122) to swing synchronously. The rotating mechanism has low assembly precision requirements and involves stable and smooth transmission.

Description

Rotating mechanism and electric toothbrush Technical Field

[0001] The utility model belongs to the technical field of electric toothbrushes, and in particular relates to a rotating mechanism and an electric toothbrush. Background Art

[0002] Currently, most rotary toothbrushes on the market use an eccentric drive shaft design. These are driven by gears (for example, the vertical-brush electric toothbrush with a composite brush provided by Chinese Patent Publication No. CN 110151351 A) or by a raceway (for example, the electric toothbrush provided by Chinese Patent Publication No. CN 201223467Y).

[0003] Among them, the rotating toothbrush driven by gears generally obtains the eccentric position through gear coupling. Due to the extremely high clearance requirements between gears, ordinary production processes cannot meet the requirements, resulting in unstable product quality; the other type of rotating toothbrush driven by the runway groove is driven by the eccentric wheel to drive the runway groove connecting rod. The runway groove and the eccentric wheel positioning shaft are in surface contact. Due to the large contact area of ​​the moving parts and the forced change of movement direction, irregular movement and easy deformation of the runway groove are caused. Technical Solutions

[0004] In order to solve the above technical problems in the prior art, the present invention provides a rotating mechanism and an electric toothbrush. The rotating mechanism has low assembly precision requirements and stable and smooth transmission.

[0005] The technical solution adopted in the embodiment of the utility model is:

[0006] A rotary mechanism for an electric toothbrush, comprising a motor, an eccentric wheel disposed on an output shaft of the motor, and a drive shaft, wherein the drive shaft is connected to a brush head. The rotary drive mechanism comprises:

[0007] a motor frame for mounting the motor;

[0008] a swing rod, a first end of which is rotatably connected to the motor frame;

[0009] a connecting rod assembly comprising a first connecting rod and a second connecting rod, wherein the first connecting rod is rotatably connected to the axle of the eccentric wheel and the second end of the swing rod, respectively, and the second connecting rod is rotatably connected to the drive shaft and the second end of the swing rod, respectively;

[0010] When the eccentric wheel rotates, the first connecting rod can drive the swing arm to swing relative to the motor frame within a preset angle range, and when the swing arm swings, the second connecting rod can drive the drive shaft to swing synchronously.

[0011] Furthermore, the rotating mechanism also includes an intermediate bracket, which is connected to the motor frame. The drive shaft is provided with a first positioning column and a second positioning column. The first positioning column is rotatably connected to the intermediate bracket, and the second positioning column is rotatably connected to the second connecting rod.

[0012] Furthermore, the first connecting rod, the rocker arm and the second connecting rod are all located between the intermediate bracket and the motor bracket, and are arranged in sequence along the axial direction of the output shaft of the motor.

[0013] Furthermore, the swing arm is provided with a rotating shaft at each end, and the two connecting rods have an axial hole at each end. The axial holes at the first ends of the two connecting rods are respectively inserted into the wheel shaft of the eccentric wheel and the drive shaft, and the axial holes at the second ends of the two connecting rods are respectively inserted into the rotating shaft on the swing arm. This structure makes it easier to assemble the swing arm and the two connecting rods.

[0014] Furthermore, the motor frame is provided with a connecting shaft parallel to the axis of the motor output shaft, offset from the motor output shaft, and a positioning hole is provided at the end of the connecting shaft. The rotating shaft at the first end of the swing arm extends into the positioning hole and has a clearance fit therewith. This structure facilitates assembly of the swing arm.

[0015] Furthermore, the rotating mechanism further includes a top bracket and a sealing sleeve respectively sleeved on the drive shaft, wherein the top bracket is connected to the intermediate bracket, and the sealing sleeve is fixed to the top bracket, wherein the top bracket and the drive shaft have a clearance fit, and the sealing sleeve and the drive shaft have an interference fit. The sealing sleeve can prevent water from entering the electric toothbrush.

[0016] Furthermore, the driving shaft is made of stainless steel, and the sealing sleeve is made of silicone.

[0017] Furthermore, the outer portion of the drive shaft is covered with rubber, thereby protecting the drive shaft.

[0018] Furthermore, the preset angle range is -20°~20°.

[0019] An electric toothbrush comprises a rotating mechanism according to any one of the above embodiments. Beneficial effects

[0020] Compared with the prior art, the beneficial effects of the embodiments of the present invention are:

[0021] Compared with the gear mechanism and runway-type connecting rod mechanism, the rotating mechanism of the utility model connects the wheel axle and the driving shaft of the eccentric wheel through two connecting rods and a rocker rod, which can make the driving shaft swing more stable and smooth, reduce power consumption and noise, and thus extend the service life of the electric toothbrush.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In the drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar components in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar components. The accompanying drawings generally illustrate various embodiments by way of example and not limitation, and together with the description and claims, serve to illustrate the disclosed embodiments. Where appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.

[0024] FIG1 is an exploded view of a rotating mechanism according to an embodiment of the present invention;

[0025] FIG2 is a schematic structural diagram of the rotating mechanism of the present invention when the eccentric wheel is not rotating;

[0026] FIG3 is a schematic structural diagram of the eccentric wheel in the rotating mechanism of the present utility model embodiment when it rotates 90 degrees counterclockwise;

[0027] FIG4 is a schematic structural diagram of the eccentric wheel in the rotating mechanism of the present utility model embodiment when it rotates 180 degrees counterclockwise;

[0028] FIG5 is a schematic structural diagram of the eccentric wheel in the rotating mechanism of the present utility model embodiment when it rotates 270 degrees counterclockwise;

[0029] FIG6 is a schematic structural diagram of an electric toothbrush according to an embodiment of the present invention;

[0030] FIG7 is a cross-sectional view of an electric toothbrush according to an embodiment of the present invention;

[0031] FIG8 is an exploded view of the electric toothbrush according to an embodiment of the present invention.

[0032] In the figure: 10-motor frame; 100-connecting shaft; 11-rocker; 12-connecting rod assembly; 121-first connecting rod; 122-second connecting rod; 13-middle bracket; 14-top bracket; 15-sealing sleeve; 16-motor; 17-eccentric wheel; 170-axle; 18-drive shaft; 181-first positioning column; 182-second positioning column; 19-control panel; 20-housing; 21-rubber sleeve; 22-button. Best Mode for Carrying Out the Invention

[0033] In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present invention, the present invention is described in detail below with reference to the accompanying drawings and specific implementation methods.

[0034] An embodiment of the present invention provides a rotating mechanism for an electric toothbrush. The electric toothbrush includes a motor 16, a drive shaft 18, and an eccentric wheel 17 disposed on the output shaft of the motor 16. The drive shaft 18 is used to connect to a brush head.

[0035] As shown in FIG1 , the rotating mechanism of this embodiment includes a motor frame 10, a rocker arm 11, and a connecting rod assembly 12. The motor frame 10 is used to mount a motor 16. The first end of the rocker arm 11 is rotatably connected to the motor frame 10.

[0036] The connecting rod assembly 12 includes a first connecting rod 121 and a second connecting rod 122. The first connecting rod 121 is rotatably connected to the axle 170 of the eccentric wheel 17 and the second end of the rocker arm 11. The second connecting rod 122 is rotatably connected to the drive shaft 18 and the second end of the eccentric wheel 17.

[0037] As shown in Figures 2 to 5 , the rotation of the eccentric wheel 17 in this embodiment drives the rocker arm 11 to swing within a preset angle relative to the motor frame 10 via the first connecting rod 121. This, in turn, causes the drive shaft 18 to swing synchronously with the rocker arm 11 via the second connecting rod 122. In other words, the 360-degree rotation of the eccentric wheel 17 is converted into the synchronous swinging motion of the rocker arm 11 and the drive shaft 18. Since the drive shaft 18 is connected to the brush head, the swinging of the drive shaft 18 drives the brush head to swing, achieving toothbrushing.

[0038] Preferably, the preset angle range of this embodiment can be -20°~20°.

[0039] Specifically, the eccentric wheel 17 rotates counterclockwise, and the pendulum rod 11 is located on the zero-degree reference line at the initial position.

[0040] As shown in FIG. 2 , when the eccentric wheel 17 is not rotating, the rocker 11 is exactly located on the zero-degree reference line.

[0041] As shown in FIG3 , when the eccentric wheel 17 rotates 90 degrees in the counterclockwise direction, the rocker arm 11 rotates 20 degrees in the counterclockwise direction driven by the first connecting rod 121 .

[0042] As shown in FIG4 , when the eccentric wheel 17 continues to rotate counterclockwise to 180 degrees, the pendulum rod 11 rotates 20 degrees clockwise driven by the first connecting rod 121 , and the pendulum rod 11 is now back to the zero degree reference line.

[0043] As shown in Figure 5 , when the eccentric 17 continues to rotate counterclockwise to 270 degrees, the pendulum 11 continues to rotate clockwise by 20 degrees, driven by the first connecting rod 121. As shown in Figure 6 , when the eccentric 17 rotates to 360 degrees, the pendulum 11 rotates another 20 degrees counterclockwise, driven by the first connecting rod 121, to return to the zero-degree reference line. Thus, for each complete rotation of the eccentric 17, the pendulum 11 and the drive shaft 18 swing back and forth once.

[0044] Compared with the use of a gear mechanism and a runway-type connecting rod mechanism, the rotating mechanism of this embodiment connects the wheel axle 170 of the eccentric wheel 17 and the drive shaft 18 through two connecting rods and a rocker rod 11, which can make the swing of the drive shaft 18 more stable and smooth, reduce power consumption and noise, and thus extend the service life of the electric toothbrush using the rotating mechanism.

[0045] As shown in FIG1 , in some embodiments, the rotating mechanism further includes an intermediate bracket 13 connected to the motor frame 10. The intermediate bracket 13 is used to mount a drive shaft 18. The drive shaft 18 is provided with a first positioning post 181 and a second positioning post 182 at one end connected to the second connecting rod 122.

[0046] The intermediate bracket 13 is provided with a positioning hole coaxial with the output shaft of the motor 16. The drive shaft 18 is located on the side of the intermediate bracket 13 facing away from the motor bracket 10. The first positioning post 181 of the drive shaft 18 is rotatably connected to the positioning hole in the intermediate bracket 13. The second connecting rod 122 is rotatably connected to the second positioning post 182 of the drive shaft 18. When the rocker arm 11 rotates, the second connecting rod 122 can drive the drive shaft 18 to swing about the axis of the first positioning post 181 on it. It is easy to understand that the intermediate bracket 13 can be provided with a clearance space to allow the second positioning post 182 to rotate.

[0047] As shown in Figure 1, in some embodiments, the first connecting rod 121, the rocker arm 11, and the second connecting rod 122 are all located between the intermediate bracket 13 and the motor frame 10 and arranged sequentially along the axis of the motor output shaft. The first connecting rod 121 and the second connecting rod 122 are located on opposite sides of the rocker arm 11. The first connecting rod 121 and the second connecting rod 122 are respectively close to the rocker arm 11, thereby making the rotating mechanism compact.

[0048] Furthermore, in this embodiment, rotating shafts are respectively provided at both ends of the rocker arm 11, and axial holes are respectively provided at both ends of the two connecting rods. The two axial holes on the first connecting rod 121 are respectively correspondingly sleeved on the wheel axle 170 of the eccentric wheel 17 and the rotating shaft of the rocker arm 11, and the two axial holes of the second connecting rod 122 are respectively correspondingly sleeved on the rotating shaft of the rocker arm 11 and the second positioning column 182 on the rotating shaft, which facilitates the connection between the rocker arm 11 and the two connecting rods.

[0049] As shown in Figure 1 , the motor frame 10 of this embodiment is equipped with a connecting shaft 100 that is parallel to the axis of the output shaft of the motor 16 and offset from the output shaft of the motor 16. A positioning hole is provided at the end of the connecting shaft 100. The rotating shaft of the first end of the swing arm 11 extends into this positioning hole and connects with the positioning hole. When the eccentric wheel 17 rotates, the first connecting rod 121 drives the swing arm 11 to swing about the axis of the connecting shaft 100. This structure facilitates the assembly of the swing arm 11.

[0050] As shown in FIG1 , in some embodiments, the rotating mechanism further includes a top bracket 14 and a sealing sleeve 15, each of which is sleeved on the drive shaft 18. The top bracket 14 is located on a side of the intermediate bracket 13 facing away from the motor frame 10 and is connected to the intermediate bracket 13. The top bracket 14 is used to stabilize the drive shaft 18.

[0051] In this embodiment, the top bracket 14 and sealing sleeve 15 are respectively mounted on the drive shaft 18. The top bracket 14 and the drive shaft 18 have a clearance fit to prevent interference with the rotation of the drive shaft 18. The sealing sleeve 15 has an interference fit with the drive shaft 18 to prevent water from entering the interior of the electric toothbrush. Preferably, the sealing sleeve 15 is made of silicone.

[0052] In order to ensure the strength and waterproofness of the drive shaft 18 , the drive shaft 18 of this embodiment is made of stainless steel. At the same time, the outer periphery of the drive shaft 18 is covered with rubber, which can protect the drive shaft 18 .

[0053] As shown in FIG6 to FIG8, an embodiment of the present invention further provides an electric toothbrush, which comprises at least a control panel 19, a housing 20, a rubber sleeve 21 and a rotating mechanism as described in any one of the above embodiments.

[0054] The outer shell 20 wraps the control board 19 and the rotating mechanism respectively. The drive shaft 18 on the rotating mechanism extends to the outside, and the free end of the drive shaft 18 is used to connect the brush head. The control board 19 is connected to the motor 16. The control board 19 is provided with a switch for controlling the start and stop of the motor 16.

[0055] The rubber sleeve 21 is sleeved on the housing 20 . A button 22 is provided on the rubber sleeve 21 . The button 22 corresponds to the switch on the control panel 19 . The switch can be controlled by the button 22 .

[0056] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the scope of the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the spirit and scope of protection of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present invention.

Claims

1. A rotating mechanism used in an electric toothbrush, the electric toothbrush comprising a motor (16), a drive shaft (18) and an eccentric wheel (17) arranged on the output shaft of the motor (16), the drive shaft (18) being used to connect to a brush head, characterized in that: The rotating mechanism comprises: A motor frame (10) for mounting the motor (16); A swing rod (11), a first end of which is rotatably connected to the motor frame (10); A connecting rod assembly (12), comprising a first connecting rod (121) and a second connecting rod (122), wherein the first connecting rod (121) is rotatably connected to the axle of the eccentric wheel (17) and the second end of the swing rod (11), respectively, and the second connecting rod (122) is rotatably connected to the drive shaft (18) and the second end of the swing rod (11), respectively; When the eccentric wheel (17) rotates, it can drive the swing arm (11) to swing relative to the motor frame (10) within a preset angle range via the first connecting rod (121), and when the swing arm (11) swings, it can drive the drive shaft (18) to swing synchronously via the second connecting rod (122).

2. A rotating mechanism according to claim 1, characterized in that: The rotating mechanism further comprises an intermediate bracket (13), wherein the intermediate bracket (13) is connected to the motor bracket (10), and the driving shaft (18) is provided with a first positioning column (181) and a second positioning column (182), wherein the first positioning column (181) is rotationally connected to the intermediate bracket (13), and the second positioning column (182) is rotationally connected to the second connecting rod (122).

3. A rotating mechanism according to claim 2, characterized in that: The first connecting rod (121), the swing rod (11) and the second connecting rod (122) are all located between the intermediate bracket (13) and the motor bracket (10), and are arranged in sequence along the axial direction of the output shaft of the motor (16).

4. A rotating mechanism according to claim 2, characterized in that: The two ends of the swing rod (11) are respectively provided with rotating shafts, and the two ends of the two connecting rods are respectively provided with shaft holes, the shaft holes at the first ends of the two connecting rods are correspondingly sleeved on the wheel shaft of the eccentric wheel (17) and the driving shaft (18), and the shaft holes at the second ends of the two connecting rods are respectively sleeved on the rotating shafts on the swing rod (11).

5. A rotating mechanism according to claim 4, characterized in that: The motor frame (10) is provided with a connecting shaft (100) which is parallel to the axis of the output shaft of the motor (16); the connecting shaft (100) is arranged offset from the output shaft of the motor (16); a positioning hole is provided at the end of the connecting shaft (100); the rotating shaft of the first end of the rocker arm (11) extends into the positioning hole and is in clearance fit with the positioning hole.

6. A rotating mechanism according to claim 2, characterized in that: The rotating mechanism further comprises a top bracket (14) and a sealing sleeve (15) respectively sleeved on the driving shaft (18); the top bracket (14) is connected to the intermediate bracket (13); the sealing sleeve (15) is fixed on the top bracket (14); the top bracket (14) and the driving shaft (18) are clearance-fitted; the sealing sleeve (15) and the driving shaft (18) are interference-fitted.

7. A rotating mechanism according to claim 6, characterized in that: The exterior of the drive shaft (18) is covered with rubber.

8. A rotating mechanism according to claim 7, characterized in that: The material of the driving shaft (18) is stainless steel, and the material of the sealing sleeve (15) is silicone rubber.

9. A rotating mechanism according to claim 1, characterized in that: The preset angle range is -20°~20°.

10. An electric toothbrush, characterized in that: A rotating mechanism comprising any one of claims 1 to 9.

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