Toothbrush head structure and electric toothbrush

Abstract

A toothbrush head structure and an electric toothbrush, the toothbrush head structure comprising: a housing comprising a main body portion and a brush head portion, the main body portion being provided with an accommodating cavity extending along a first direction, the brush head portion being provided with a brush head groove along a second direction; the driving mechanism is arranged in the accommodating cavity and is used for outputting torque; the bristle carrier is used for sealing the brush head groove and is rotationally connected with the brush head part, and a connecting hole extending in the second direction is formed in the bristle carrier; the rotating shaft is arranged in the containing cavity and penetrates through the connecting hole, the rotating shaft comprises a main shaft and a bending part, a preset angle is formed between the axis of the bending part and the axis of the main shaft, the main shaft is in transmission connection with the driving mechanism, and the bending part is arranged in the connecting hole; when the main shaft rotates, the bending part is driven to perform eccentric motion with the main shaft as the center, and when the bending part performs eccentric motion, the bristle carrier is driven to perform reciprocating rotation in a plane perpendicular to the second direction.

Description

Technical Field

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

[0002] Compared with ordinary toothbrushes, electric toothbrushes have a better cleaning effect on teeth, so their market share is increasing year by year. Electric toothbrushes are cleaning tools that use motors to make the brush head of the toothbrush produce high-frequency reciprocating motion to clean the oral cavity and maintain health. They are easy to use and have good cleaning effects, and are deeply loved by modern young people.

[0003] Usually, when the motor drives the brush head to reciprocate, it needs to be converted through eccentric motion. Traditional electric toothbrushes on the market generally use the cooperation of cams and connecting rods to achieve the transmission of eccentric motion. However, because the length of the connecting rod structure is too long, it occupies a large structural space and increases the volume of the electric toothbrush. At the same time, the connecting rod is also prone to vibration during the transmission process, which increases the noise.

[0004] Therefore, how to design an electric toothbrush with a simpler structure is a problem that technicians in this field need to solve. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a toothbrush head structure, aiming to solve the problem that the connecting rod occupies a large structural space and produces a large noise.

[0006] The utility model provides a toothbrush head structure for an electric toothbrush, comprising:

[0007] The housing comprises a main body and a brush head, wherein the main body is provided with a receiving cavity extending along a first direction, and the brush head is provided with a brush head groove along a second direction, wherein the first direction is perpendicular to the second direction;

[0008] A driving mechanism, disposed in the accommodating cavity, for outputting torque;

[0009] A bristle carrier, used to close the brush head groove and rotatably connected to the brush head, and the bristle carrier is provided with a connecting hole extending along the second direction;

[0010] A rotating shaft is arranged in the accommodating cavity and passes through the connecting hole, the rotating shaft comprises a main shaft and a bending portion, the axis of the bending portion forms a preset angle with the axis of the main shaft, the main shaft is transmission-connected with the driving mechanism, the bending portion is arranged in the connecting hole, and the driving mechanism is used to drive the main shaft to rotate;

[0011] Wherein, when the main shaft rotates, the bending part is driven to rotate, and when the bending part rotates, the bristle carrier is driven to reciprocate in a plane perpendicular to the second direction.

[0012] In one embodiment, the center of the bending portion is located on the axis of the main shaft, and the center of the bending portion is located on the axis of the bristle carrier.

[0013] In one embodiment, along the third direction, the width of the connecting hole is greater than the diameter of the bending portion, the width of the connecting hole is less than the maximum rotation diameter of the bending portion, and the third direction is perpendicular to the second direction and perpendicular to the first direction.

[0014] In one embodiment, the rotating shaft also includes a fixing portion, which is coaxial with the main shaft. Along the first direction, a positioning hole coaxial with the main shaft is provided on the side of the brush head away from the main shaft, and the fixing portion is connected to an end of the bending portion away from the main shaft and inserted into the positioning hole.

[0015] In one embodiment, the toothbrush head structure also includes a fixing part, the brush head part is provided with a through hole, the surface of the bristle carrier facing the through hole is provided with a slide groove which is in the same plane as the through hole, and the fixing part passes through the through hole and the slide groove at the same time to limit the axial movement of the bristle carrier.

[0016] In one embodiment, the main shaft includes a first shaft segment and a second shaft segment, the first shaft segment is transmission-connected to the driving mechanism, the second shaft segment is connected to the bending portion, and the diameter of the first shaft segment corresponds to the inner diameter of the main body.

[0017] In one embodiment, a diameter of the first shaft segment is greater than a diameter of the second shaft segment.

[0018] In one embodiment, along the second direction, the length of the connecting hole is greater than or equal to the maximum rotation diameter of the bending portion.

[0019] In one embodiment, the preset angle range is between 10° and 20°.

[0020] Another embodiment of the present application further provides an electric toothbrush, comprising the toothbrush head structure as described above.

[0021] In the toothbrush head structure provided by the embodiment of the utility model, the driving mechanism is directly connected to the rotating shaft to drive the rotating shaft to rotate. The part where the rotating shaft is connected to the bristle carrier is a bending part, and the bending part forms a preset angle with the main shaft, so as to realize the eccentric movement of the bending part relative to the main shaft, and the eccentric movement of the bending part drives the bristle carrier to reciprocate. In this application, the eccentric motion is transmitted only by the rotating shaft, and a connecting rod is not required, which makes the structure more compact, smaller in size, and reduces noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 The figure is a schematic structural diagram of an electric toothbrush according to an embodiment of the present invention.

[0024] Figure 2 for Figure 1 Front view of the electric toothbrush shown.

[0025] Figure 3 for Figure 1 Left side view of the electric toothbrush shown.

[0026] Figure 4 for Figure 2 A cross-sectional view of the electric toothbrush taken along line AA is shown.

[0027] Figure 5 for Figure 2 A cross-sectional view of the electric toothbrush at BB is shown.

[0028] Figure 6 for Figure 3 Cross-sectional view at CC of the electric toothbrush shown.

[0029] Figure 7 for Figure 5 Schematic diagram of the structure of the bending portion and the bristle carrier.

[0030] Figure 8 for Figure 7 The schematic diagram of the structure after the bending portion is rotated 90° is shown.

[0031] Fig. 9 It is a motion diagram of the bending part rotation process.

[0032] Fig.10 for Figure 5 A schematic structural diagram of the bristle carrier shown.

[0033] Fig.11 for Figure 1 Schematic diagram of the structure of the shell shown. DETAILED DESCRIPTION

[0034] The following will describe in detail a specific embodiment of the utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the description of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] In the description of the present utility model, unless otherwise clearly specified and limited, the terms "set", "install", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0036] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the utility model.

[0037] The terms "first", "second", "third" and the like are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0038] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0039] Please refer to Figures 1 to 10 , which shows a toothbrush head structure provided in an embodiment of the utility model, which is used for an electric toothbrush, comprising:

[0040] The housing 1 comprises a main body 11 and a brush head 12. The main body 11 is provided with a receiving cavity extending along a first direction. The brush head 12 is provided with a brush head groove along a second direction. The first direction is perpendicular to the second direction.

[0041] A driving mechanism 2 is disposed in the accommodating cavity and is used to output torque;

[0042] The bristle carrier 3 is used to close the brush head groove and is rotatably connected to the brush head 12, and the bristle carrier 3 is provided with a connecting hole 31 extending along the second direction;

[0043] The rotating shaft 4 is disposed in the accommodating cavity and passes through the connecting hole 31. The rotating shaft 4 includes a main shaft 41 and a bending portion 42. The bending portion 42 forms a preset angle with the main shaft 41. The main shaft 41 is transmission-connected with the driving mechanism 2. The bending portion 42 passes through the connecting hole 31. The driving mechanism 2 is used to drive the main shaft 41 to rotate.

[0044] When the main shaft 41 rotates, the bending part 42 is driven to perform eccentric movement with the main shaft 41 as the center. When the bending part 42 performs eccentric movement, it drives the bristle carrier 3 to reciprocate in a plane perpendicular to the second direction.

[0045] like Figure 1 As shown, the housing 1 is preferably a rotating body for easy gripping. The main body 11 is the main gripping area, and a receiving cavity is provided inside for placing the driving mechanism 2. The receiving cavity extends along a first direction, and the first direction is the axial direction of the main body 11.

[0046] In addition, along the first direction, the brush head 12 is fixedly connected to the main body 11. The brush head 12 is also a rotating body, and a brush head groove extending along the second direction is provided in the brush head 12. The second direction is the axial direction of the brush head 12, so the first direction is perpendicular to the second direction, that is, the axial direction of the main body 11 is perpendicular to the axial direction of the brush head 12. The bristle carrier 3 is inserted into the brush head groove, closes the brush head groove, and is rotatably connected to the brush head 12.

[0047] The main shaft 41 of the rotating shaft 4 is inserted into the main body 11, and the bending part 42 passes through the brush head 12. The main shaft 41 is inserted into the main body 11 and is in transmission connection with the driving mechanism 2, and the bending part 42 passes through the brush head 12 and abuts against the bristle carrier 3. The function of the rotating shaft 4 is to transmit the power of the driving mechanism 2 to the bristle carrier 3, so that the bristle carrier 3 can rotate.

[0048] like Figure 5 As shown, the main shaft 41 is a linear shaft extending in the first direction. The axis of the bending portion 42 forms a preset angle with the axis of the main shaft 41, that is, the axis of the bending portion 42 and the axis of the main shaft 41 are arranged crosswise. When the driving mechanism 2 drives the main shaft 41 to rotate, the main shaft 41 drives the bending portion 42 to rotate around the axis of the main shaft 41 and perform eccentric motion. And because the bending portion 42 and the main shaft 41 are arranged crosswise, the end of the bending portion 42 needs to be connected to the main shaft 41 through a bent transition portion.

[0049] It should also be noted that in this embodiment, the first direction is defined as the front-to-back direction, the second direction is defined as the up-down direction, and the third direction is defined as the left-to-right direction.

[0050] Please refer to Figures 7 to 9 ,exist Figure 7 In the state shown, in the projection in the up-down direction, the main axis 41 and the bending portion 42 are in a straight line, that is, Fig. 9 At this time, the connecting hole 31 in the bristle carrier 3 is also facing the main shaft 41, and in the projection of the second direction, the connecting hole 31 and the main shaft 41 are in the same straight line. In the left and right directions, the width of the connecting hole 31 corresponds to the diameter of the bending part 42, ensuring that the bending part 42 can abut against the inner wall of the connecting hole 31 when rotating. Figure 7 When the main shaft 41 drives the bending part 42 to rotate 90° in the clockwise direction M, the bending part 42 drives the bristle carrier 3 to rotate in the N direction and enters Figure 8 status.

[0051] During the process of the bending portion 42 rotating 90° in the clockwise direction M, the bending portion 42 also changes position in the second direction. In short, the rotation process of the bending portion 42 can be divided into position changes in the left-right direction and the up-down direction, and there will be no change in the front-back direction. The connecting hole 31 extends in the up-down direction, so the position change of the bending portion 42 in the second direction will not be limited by the connecting hole 31. Fig. 9 As shown in the state 2 in the figure, at this time, the projection in the up-down direction shows that the bending portion 42 has deviated from the main axis 41 and is in a cross-shaped form with the main axis 41. The bending portion 42 passes through the connecting hole 31 in the front-back direction, so it drives the connecting hole 31 to rotate together. Fig. 9 It can be seen from the state 2 that because the width of the connecting hole 31 corresponds to the diameter of the bending portion 42, the connecting hole 31 always remains parallel to the bending portion 42. Therefore, the connecting hole 31 changes from the position directly opposite the main axis 41 in the state 1 to the position intersecting the main axis 41. Since the connecting hole 31 is provided on the bristle carrier 3, the rotation of the connecting hole 31 is equivalent to the rotation of the bristle carrier 3. The projection in the second direction will appear in a plane perpendicular to the second direction, so the rotation of the connecting hole 31 in the projection is equal to the rotation of the bristle carrier 3 in the plane perpendicular to the second direction.

[0052] When the main shaft 41 drives the bending portion 42 to rotate 90° in the clockwise direction M, as shown in FIG. Figure 8 as well as Fig. 9 As shown in state 2, the bending portion 42 rotates to be in a plane perpendicular to the second direction. At this time, in the projection of the second direction, the bending portion 42 is located at the position farthest from the main shaft 41. When the main shaft 41 drives the bending portion 42 to continue to rotate, the bending portion 42 rotates in the direction close to the main shaft 41, thereby driving the bristle carrier 3 to rotate in the direction close to the main shaft 41. When the bending portion 42 rotates to a position colinear with the main shaft 41 again, it returns to the position colinear with the main shaft 41. Fig. 9 Then the bristle carrier 3 is driven to move to a position symmetrical to state 1. Fig. 9 The second symmetrical position, the last bending part 42 continues to rotate and drives the bristle carrier 3 back to Fig. 9The position of state 1. At this point, the bending portion 42 completes a complete circular motion, driving the bristle carrier 3 to complete a complete reciprocating rotation.

[0053] In the present application, the eccentric motion is transmitted only by a rotating shaft 4, eliminating the connecting rod component, making the structure simpler and smaller in size, while also being able to reduce vibration and noise.

[0054] In one embodiment, the center of the bending portion 42 is located on the axis of the main shaft 41, and the center of the bending portion 42 is located on the axis of the bristle carrier 3. Fig. 9 As shown in state 2, the bent portion 42 not only passes through the axis of the main shaft 41, but also the center of the bent portion 42 is on the axis of the main shaft 41. Figure 5 As shown, the center of the bending portion 42 is also located on the axis of the bristle carrier 3.

[0055] like Fig. 9 As shown in state 1, when the bending portion 42 passes through the axis of the main shaft 41, the force on the connecting hole 31 is symmetrical, and the force arm is the same. Therefore, this arrangement can make the bending portion 42 abut against the bristle carrier 3 and drive the bristle carrier 3 to rotate, and the force on the bristle carrier 3 is more uniform, and the transmission is more stable.

[0056] In one embodiment, the main shaft 41 includes a first shaft segment 411 and a second shaft segment 412 . The first shaft segment 411 is transmission-connected to the driving mechanism 2 , and the second shaft segment 412 is connected to the bending portion 42 . The diameter of the first shaft segment 411 corresponds to the inner diameter of the main body 11 .

[0057] Please refer to Figure 6 , wherein the second shaft section 412 is fixedly connected inside the first shaft section 411. When the driving mechanism 2 drives the first shaft section 411 to rotate, the second shaft section 412 rotates together with the first shaft section 411, and then the second shaft section 412 drives the bending portion 42 to rotate together. Preferably, a clearance fit is selected between the first shaft section 411 and the main body 11. The diameter of the first shaft section 411 corresponds to the inner diameter of the main body 11, which makes the diameter of the first shaft section 411 equal to the inner diameter of the main body 11 while ensuring that the first shaft section 411 does not rub against the main body 11 when rotating, thereby reducing the gap between the first shaft section 411 and the main body 11, thereby achieving the effect of reducing the vibration of the first shaft section 411.

[0058] In one embodiment, the diameter of the first shaft segment 411 is greater than the diameter of the second shaft segment 412. Figure 5 and Figure 6, wherein the second shaft segment 412 is connected to the bent portion 42, and the bent portion 42 is inserted into the connecting hole 31, so the diameter of the second shaft segment 412 affects the size of the connecting hole 31. Designing the diameter of the second shaft segment 412 to be smaller than the diameter of the first shaft segment 411 helps to save space and reduce the structural volume.

[0059] In one embodiment, along the third direction, the width of the connection hole 31 is greater than the diameter of the bending portion 42, and the width of the connection hole 31 is less than the maximum rotation diameter of the bending portion 42. The third direction is perpendicular to the second direction, and the third direction is perpendicular to the first direction.

[0060] Please refer to Figure 7 as well as Fig. 9 , the third direction is Fig. 9 The direction perpendicular to the axis of the main shaft 41 in state 1 is the width direction of the connecting hole 31. The width of the connecting hole 31 is greater than the diameter of the bending portion 42, so that the bending portion 42 can smoothly pass through the connecting hole 31, thereby driving the connecting hole 31 to rotate. Fig. 9 As shown in state 2, the farther the bend portion 42 is from the center, the greater the vertical distance from the main shaft 41. The vertical distance between the end of the bend portion 42 and the main shaft 41 is the maximum rotation radius of the bend portion 42, so the width of the connecting hole 31 is smaller than the maximum rotation diameter of the bend portion 42, so that the bend portion 42 can abut against the connecting hole 31, thereby driving the connecting hole 31 to rotate.

[0061] In one embodiment, the rotating shaft 4 also includes a fixing portion 43, which is coaxial with the main shaft 41. Along the first direction, a positioning hole 121 coaxial with the main shaft 41 is provided on the side of the brush head 12 away from the main shaft 41. The fixing portion 43 is connected to the end of the bending portion 42 away from the main shaft 41 and inserted into the positioning hole 121.

[0062] Please refer to Fig.11 A positioning hole 121 is provided on the side of the brush head 12 away from the main shaft 41, and the end of the bending part 42 away from the main shaft 41 is connected to the fixing part 43. The fixing part 43 is also coaxial with the main shaft 41, so the end of the bending part 42 and the connection with the fixing part 43 also need to be connected through a bent transition part. After the fixing part 43 is inserted into the positioning hole 121, the brush head 12 can provide positioning and support for the fixing part 43. Preferably, the diameter of the positioning hole 121 is equal to the diameter of the fixing part 43, so that the fixing part 43 is just inserted into the positioning hole 121, thereby reducing the gap between the fixing part 43 and the positioning hole 121, achieving the effect of reducing the vibration of the fixing part 43, and then reducing the vibration of the bending part 42 through the fixing part 43.

[0063] In one embodiment, the toothbrush head structure also includes a fixing part 5, a through hole 122 is provided in the brush head part 12, and a slide groove 32 which is in the same plane as the through hole 122 is provided on the surface of the bristle carrier 3 facing the through hole 122, and the fixing part 5 passes through the through hole 122 and the slide groove 32 at the same time, so as to limit the axial movement of the bristle carrier 3.

[0064] Please refer to Figure 7 , Fig.10 as well as Fig.11 First, a through hole 122 is opened on the brush head 12, and then the slide groove 32 opened on the bristle carrier 3 is in the same plane as the through hole 122, and both are in a plane perpendicular to the second direction. At this time, a fixing member 5 passes through the slide groove 32 and the through hole 122 at the same time. Because the fixing member 5 is limited by the through hole 122 in the second direction, and the slide groove 32 and the through hole 122 are in the same plane, the slide groove 32 does not extend in the second direction, so the slide groove 32 cannot move relative to the fixing member 5 in the second direction, thereby limiting the movement of the bristle carrier 3 relative to the brush head 12 in the second direction through the fixing member 5. The slide groove 32 is arc-shaped, and the curvature is greater than the angle between the axis of the bending portion 42 and the axis of the main shaft 41, so as to ensure that the bristle carrier 3 can rotate smoothly.

[0065] In one embodiment, along the second direction, the length of the connecting hole 31 is greater than or equal to the maximum rotation diameter of the bending portion 42. Figure 4 In this embodiment, the connection hole 31 is not only for the bending part 42 to rotate, but also for the fixing member 5 to pass through. Therefore, the length of the connection hole 31 is greater than the maximum rotation diameter of the bending part 42, thereby ensuring that the bending part 42 can rotate smoothly.

[0066] In one embodiment, the preset angle range is between 10° and 20°. Fig. 9 From the second state, it can be seen that the angle between the axis of the bending portion 42 and the axis of the main shaft 41 is equal to half of the reciprocating angle of the bristle carrier 3. The larger the preset angle, the larger the rotation radius of the bending portion 42, and the more difficult the rotation process. And considering the comfort of brushing and cleaning efficiency, the preset angle of 12.5° is the best.

[0067] Another embodiment of the present application further provides an electric toothbrush, comprising the toothbrush head structure as described above. The electric toothbrush with the toothbrush head structure is simpler in structure, smaller in size, and less noisy.

[0068] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the attached claims.

Claims

1. A toothbrush head structure for an electric toothbrush, characterized in that: include: The housing (1) comprises a main body (11) and a brush head (12), wherein the main body (11) is provided with a receiving cavity extending along a first direction, and the brush head (12) is provided with a brush head groove along a second direction, wherein the first direction is perpendicular to the second direction; A driving mechanism (2) is disposed in the accommodating cavity and is used to output torque; A bristle carrier (3) is used to close the brush head groove and is rotatably connected to the brush head (12), and the bristle carrier (3) is provided with a connecting hole (31) extending along the second direction; a rotating shaft (4), arranged in the accommodating cavity and passing through the connecting hole (31), the rotating shaft (4) comprising a main shaft (41) and a bending portion (42), the axis of the bending portion (42) forming a preset angle with the axis of the main shaft (41), the main shaft (41) being transmission-connected to the driving mechanism (2), the bending portion (42) being arranged in the connecting hole (31), and the driving mechanism (2) being used for driving the main shaft (41) to rotate; When the main shaft (41) rotates, it drives the bending part (42) to rotate, and when the bending part (42) rotates, it drives the bristle carrier (3) to reciprocate in a plane perpendicular to the second direction.

2. The toothbrush head structure according to claim 1, characterized in that: The center of the bending portion (42) is located on the axis of the main shaft (41), and the center of the bending portion (42) is located on the axis of the bristle carrier (3).

3. The toothbrush head structure according to claim 1, characterized in that: Along the third direction, the width of the connection hole (31) is greater than the diameter of the bending portion (42), the width of the connection hole (31) is less than the maximum rotation diameter of the bending portion (42), the third direction is perpendicular to the second direction, and the third direction is perpendicular to the first direction.

4. The toothbrush head structure according to claim 1, characterized in that: The rotating shaft (4) further comprises a fixing portion (43), wherein the fixing portion (43) is coaxial with the main shaft (41); along a first direction, a positioning hole (121) coaxial with the main shaft (41) is provided on a side of the brush head (12) away from the main shaft (41); the fixing portion (43) is connected to an end of the bending portion (42) away from the main shaft (41) and is inserted into the positioning hole (121).

5. The toothbrush head structure according to claim 1, characterized in that: The toothbrush head structure also includes a fixing member (5), the brush head portion (12) is provided with a through hole (122), the surface of the bristle carrier (3) facing the through hole (122) is provided with a slide groove (32) which is in the same plane as the through hole (122), and the fixing member (5) passes through the through hole (122) and the slide groove (32) at the same time, so as to limit the axial movement of the bristle carrier (3) on the bristle carrier (3).

6. The toothbrush head structure according to claim 1, characterized in that: The main shaft (41) comprises a first shaft section (411) and a second shaft section (412); the first shaft section (411) is transmission-connected to the driving mechanism (2); the second shaft section (412) is connected to the bending portion (42); and the diameter of the first shaft section (411) corresponds to the inner diameter of the main body (11).

7. The toothbrush head structure according to claim 6, characterized in that: The diameter of the first shaft segment (411) is greater than the diameter of the second shaft segment (412).

8. The toothbrush head structure according to claim 1, characterized in that: Along the second direction, the length of the connecting hole (31) is greater than or equal to the maximum rotation diameter of the bending portion (42).

9. The toothbrush head structure according to claim 1, characterized in that: The preset angle range is between 10° and 20°.

10. An electric toothbrush, characterized in that: The toothbrush head structure comprises the toothbrush head structure as described in any one of claims 1-9.

Images