Toothbrush head and electric toothbrush

Abstract

The utility model relates to the field of electric toothbrushes, and provides a toothbrush head and an electric toothbrush. The toothbrush head comprises a brush head body, a bristle module and a balancing weight, and a containing cavity is formed in the side face of the head of the brush head body; the bristle module comprises a bristle seat and bristles; the balancing weight is fixed in the containing cavity in a matched mode and relatively located between the bottom face of the containing cavity and the bristle base, a first step face is arranged on one side of the balancing weight, a second step face is arranged on the bottom face of the containing cavity, and the second step face is matched with the first step face. The electric toothbrush comprises a toothbrush head and a brush handle, the brush handle is provided with a transmission shaft, and the transmission shaft is connected with a rod of the toothbrush head. The balancing weight is arranged at the head of the toothbrush head, the first step face is arranged on the side, away from the bristle module, of the balancing weight, so that the overall gravity center of the balancing weight is lower, the balancing weight effect is better, meanwhile, the second step face is arranged on the bottom face of the containing cavity, the second step face and the first step face are installed in a matched mode, and the installation strength of the balancing weight and the toothbrush head is improved; and the balancing weight is prevented from sliding or shifting.

Description

Technical Field

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

[0002] Electric toothbrushes are increasingly popular among consumers due to their cleaning performance, and are being used more frequently in daily life. Currently, electric toothbrush heads require high-frequency vibrations in all directions to ensure the bristles can clean teeth at high speeds. However, due to the light weight of the brush head itself, high-frequency vibrations can cause a strong vibration, resulting in a poor user experience. Utility Model Content

[0003] In response to the above technical problems, the purpose of the present utility model is to provide a toothbrush head and an electric toothbrush, in which a counterweight is provided on the head of the toothbrush head, and a first step surface is provided on the side of the counterweight away from the bristle module, so that the overall center of gravity of the counterweight is lower and the counterweight effect is better. At the same time, a second step surface is provided on the bottom surface of the accommodating cavity, and the second step surface is adapted to be installed with the first step surface to increase the installation strength of the counterweight and the toothbrush head and prevent the counterweight from sliding or shifting.

[0004] In order to achieve the above-mentioned object, the utility model provides a toothbrush head, comprising a brush head body, a bristle module and a counterweight block, wherein the brush head body comprises a stem and a head, the head is arranged at the top end of the stem and a receiving cavity is opened on the side of the head;

[0005] The bristle module includes a bristle holder and bristles, the bristle holder is installed in the accommodating cavity, and the bristles are fixedly installed on the bristle holder;

[0006] The counterweight block is adapted and fixed in the accommodating cavity and is relatively located between the bottom surface of the accommodating cavity and the brush seat. The counterweight block is provided with a first step surface on the side away from the brush module, and the bottom surface of the accommodating cavity is provided with a second step surface, and the second step surface is adapted to the first step surface.

[0007] In some embodiments, the first step surface includes a plurality of first portions and a plurality of second portions connected in sequence, the first portion extending toward the center of the counterweight block, and the second portion connecting the ends of the first portion and extending toward a side away from the bristle module.

[0008] In some embodiments, the first step surface further includes a plurality of grooves, wherein the grooves are provided on the first portion and are recessed toward a side close to the bristle module;

[0009] The second step surface is also provided with a plurality of protrusions correspondingly, and the protrusions are suitable for matching and installing in the groove.

[0010] In some embodiments, the groove is provided at an end of the first portion, and a sidewall of the groove is relatively flush with the second portion.

[0011] In some embodiments, the counterweight block is further provided with a first abutting surface on a side away from the bristle module, and the first abutting surface is provided at an end of the first step surface away from the bristle module;

[0012] A second abutting surface is correspondingly provided on the bottom surface of the accommodating cavity, and the first abutting surface and the second abutting surface are suitable for abutting each other;

[0013] Alternatively, a first abutting surface is provided on the side of the counterweight block away from the bristle module, and the first abutting surface is arranged at the end of the first step surface away from the bristle module. A mounting block is also provided on the first abutting surface, and the mounting block extends to the side away from the first abutting surface. A mounting groove is provided on the bottom surface of the accommodating cavity, and the mounting block is abutted and installed in the mounting groove.

[0014] In some embodiments, the cross-section of the counterweight is oval, the long axis of the counterweight is along the center line of the rod, and the counterweight and the bristles are arranged on both sides of the center line of the rod.

[0015] In some embodiments, a third abutting surface is further provided on the side of the counterweight block close to the bristle module group, and the third abutting surface is further provided with abutting grooves at both ends of the counterweight block in the short axis direction. A corresponding abutting block is provided in the accommodating cavity, and the abutting block is relatively located on the side of the second step surface close to the bristle module group. The abutting block is suitable for abutting and mounting with the abutting groove, and the side of the abutting block close to the bristle module group is suitable for being relatively flush with the third abutting surface.

[0016] In some embodiments, the third abutting surface is further provided with a plurality of positioning grooves, and the positioning grooves are arranged at intervals along the long axis direction of the counterweight block;

[0017] And / or, the brush head body also includes a limiting sleeve, and a mounting block is further provided on the outside of the bristle holder, the limiting sleeve is suitable for being mounted on the head and the opening of the limiting sleeve abuts against the side of the mounting block away from the head, so that the bristle holder is fixedly mounted on the head.

[0018] In some embodiments, an assembly groove is further reserved between the abutment block and the inner side wall of the accommodating cavity, and one end of the bristle holder close to the bottom surface of the accommodating cavity is adapted to be sleeved on the outside of the abutment block and relatively located in the assembly groove, so that the third abutment surface of the counterweight block is relatively located inside the bristle holder;

[0019] The bristle holder is further provided with a second arc surface at one end close to the bottom surface of the accommodating cavity, and the inner side wall of the accommodating cavity is also correspondingly provided with a first arc surface abutting against the second arc surface.

[0020] According to another aspect of the present application, an electric toothbrush is further provided, comprising a toothbrush head according to any one of the above preferred embodiments and a brush handle, wherein the brush handle has a transmission shaft connected to the rod portion of the toothbrush head.

[0021] Compared with the prior art, the toothbrush head provided by the present invention has at least one of the following beneficial effects:

[0022] 1. A counterweight is provided on the head of the toothbrush head. A first step surface is provided on the side of the counterweight away from the bristle module, which makes the overall center of gravity of the counterweight lower and the counterweight effect better. At the same time, a second step surface is provided on the bottom surface of the accommodating cavity. The second step surface is adapted to be installed with the first step surface to increase the installation strength of the counterweight and the toothbrush head and prevent the counterweight from sliding or shifting.

[0023] 2. There are several grooves on the first step surface, and there are several protrusions on the second step surface. The protrusions are suitable for matching and installing in the grooves, further strengthening the stability of the counterweight block in the accommodating cavity. At the same time, the counterweight block fits more closely with the head of the brush head body, and the counterweight block has a better shock-absorbing effect on the toothbrush head.

[0024] 3. A first abutting surface is further provided at one end of the first step surface away from the bristle module, so that the mass of the middle portion of the counterweight block is greater than that of the edge region, and the counterweight block has a better shock-absorbing effect on the toothbrush head.

[0025] 4. Abutment grooves are provided at both ends of the third abutment surface, and the abutment blocks in the accommodating cavity are installed in the abutment grooves. The abutment blocks limit the counterweight block so that the counterweight block is firmly fixed in the accommodating cavity to prevent the counterweight block from detaching from the accommodating cavity due to long-term vibration.

[0026] 5. One end of the bristle holder close to the bottom of the accommodating cavity is suitable for being sleeved on the outside of the abutment block and relatively located in the assembly groove, so that the third abutment surface of the counterweight block is relatively located inside the bristle holder, reducing the distance between the counterweight block and the bristles, and increasing the shock-absorbing effect of the counterweight block on the bristles; at the same time, the first curved surface and the second curved surface abut against each other, thereby enhancing the matching effect between the bristle holder and the head of the brush head body. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The preferred embodiments will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0028] Figure 1 It is an overall picture of a toothbrush head;

[0029] Figure 2is a cross-sectional view of a toothbrush head;

[0030] Figure 3 It is an exploded view of a toothbrush head;

[0031] Figure 4 It is an overall picture of the counterweight;

[0032] Figure 5 It is a cross-sectional view of the counterweight;

[0033] Figure 6 It is a structural diagram of the head;

[0034] Figure 7 It is a cross-section of the head;

[0035] Figure 8 It is a structural diagram of the bristle holder;

[0036] Figure 9 It is an overall diagram of an embodiment of a counterweight;

[0037] Figure 10 It is a cross-sectional view of an embodiment of a counterweight.

[0038] Description of Figure Numbers:

[0039] Brush head body 1, head 11, accommodating cavity 110, second step surface 111, protrusion 1111, second abutting surface 112, abutting block 113, assembly groove 114, first arc surface 115, rod 12, limiting sleeve 13, bristle module 2, bristle seat 21, second arc surface 211, mounting block 212, bristles 22, counterweight block 3, first step surface 31, first part 311, second part 312, groove 313, first abutting surface 32, third abutting surface 33 of mounting block 321, abutting groove 331, positioning groove 34, transmission shaft 4. DETAILED DESCRIPTION

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive work.

[0041] To simplify the drawings, only the parts relevant to the utility model are schematically shown in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one."

[0042] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0043] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0044] In addition, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance. It should be noted that the above embodiments can be freely combined as needed. The above are only preferred implementations of the present utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present utility model, several improvements and modifications can be made, and these improvements and modifications should also be considered as the scope of protection of the present utility model.

[0045] refer to Figures 1 to 3 The utility model provides a toothbrush head, including a brush head body 1, a bristle module 2 and a counterweight 3. The brush head body 1 includes a rod 12 and a head 11. The head 11 is arranged at the top of the rod 12 and a accommodating cavity 110 is opened on the side of the head 11; the bristle module 2 includes a bristle seat 21 and bristles 22. The bristle seat 21 is installed in the accommodating cavity 110, and the bristles 22 are fixedly installed on the bristle seat 21; the counterweight 3 is adapted to be fixed in the accommodating cavity 110 and is relatively located between the bottom surface of the accommodating cavity 110 and the bristle seat 21. The counterweight 3 is provided with a first step surface 31 on the side away from the bristle module 2, and the bottom surface of the accommodating cavity 110 is provided with a second step surface 111, and the second step surface 111 is adapted to the first step surface 31.

[0046] In this embodiment, a counterweight block 3 is provided on the head 11 of the toothbrush head. A first step surface 31 is provided on the side of the counterweight block 3 away from the bristle module 2, so that the overall center of gravity of the counterweight block 3 is lower and the counterweight effect is better. At the same time, a second step surface 111 is provided on the bottom surface of the accommodating cavity 110. The second step surface 111 is adapted to be installed with the first step surface 31, thereby increasing the installation strength of the counterweight block 3 and the toothbrush head and preventing the counterweight block 3 from sliding or shifting.

[0047] Specifically, the brush head body 1 includes a rod 12 and a head 11 connected to the top of the rod 12. A accommodating cavity 110 is provided on the side of the head 11. The counterweight 3 is adapted to be fixed on the side of the accommodating cavity 110 away from the bristles 22, and in the opening direction of the accommodating cavity 110, the counterweight 3 is adapted to be fixed in the accommodating cavity 110 and relatively located between the bottom surface of the accommodating cavity 110 and the bristle holder 21. A first step surface 31 is provided on the side of the counterweight 3 away from the bristle module 2. The first step surface 31 includes a plurality of first portions 311 and a plurality of second portions 312 connected in sequence. The first portion 311 extends toward the center of the counterweight 3, and the second portion 312 connects to the end of the first portion 311 and extends toward the side away from the bristle module 2. Preferably, the second portion 312 is perpendicular to the first portion 311. Due to the stepped structure of the first step surface 31, the overall center of gravity of the counterweight 3 is lower, and the balancing effect is better. The bottom surface of the accommodating cavity 110 is provided with a second step surface 111, which is adapted to the first step surface 31. The counterweight block 3 and the bottom surface of the accommodating cavity 110 are engaged with each other, which greatly increases the contact area between the counterweight block 3 and the bottom surface of the accommodating cavity 110, enhances the stability of the counterweight block 3, and prevents the counterweight block 3 from sliding or shifting.

[0048] Further, refer to Figure 4 and Figure 5 The first step surface 31 also includes a plurality of grooves 313, which are arranged on the first part 311 and recessed toward the side close to the bristle module 2; the second step surface 111 is also provided with a plurality of protrusions 1111, which are suitable for matching and installing in the grooves 313.

[0049] In this embodiment, a plurality of grooves 313 are provided on the first step surface 31, and a plurality of protrusions 1111 are correspondingly provided on the second step surface 111. The protrusions 1111 are suitable for matching and installing in the grooves 313, further enhancing the stability of the counterweight block 3 in the accommodating cavity 110. At the same time, the counterweight block 3 fits more closely with the head 11 of the brush head body 1, and the counterweight block 3 has a better shock-absorbing effect on the toothbrush head.

[0050] Specifically, the groove 313 is provided on the first portion 311, and the groove 313 is recessed toward a side away from the bottom surface of the accommodating cavity 110. Correspondingly, the second step surface 111 is also provided with a corresponding protrusion 1111, which is adapted to be mounted in the groove 313. Preferably, the groove 313 is provided at the end of the first portion 311, and the sidewall of the groove 313 is relatively flush with the second portion 312.

[0051] Furthermore, a first abutting surface 32 is provided on the side of the counterweight block 3 away from the bristle module 2, and the first abutting surface 32 is arranged at the end of the first step surface 31 away from the bristle module 2; a second abutting surface 112 is correspondingly provided on the bottom surface of the accommodating cavity 110, and the first abutting surface 32 and the second abutting surface 112 are suitable for abutting each other.

[0052] In this embodiment, a first abutting surface 32 is further provided at the end of the first step surface 31 away from the bristle module 2, so that the mass of the middle part of the counterweight block 3 is greater than that of the edge area, and the counterweight block 3 has a better shock-absorbing effect on the toothbrush head.

[0053] Specifically, refer to Figure 9 and Figure 10 , a first abutting surface 32 is further provided on the side of the counterweight 3 away from the bristle module 2. The first abutting surface 32 is provided at the end of the first step surface 31 away from the bristle module 2, and the second abutting surface 112 is provided at the end of the accommodating cavity 110 away from the bristle module 2 and is relatively located on the inner side of the second step surface 111. Preferably, the cross section of the counterweight 3 is an oval shape, the long axis direction of the counterweight 3 is along the center line of the rod 12, the counterweight 3 and the bristles 22 are respectively provided on both sides of the center line of the rod 12, and the mass of the counterweight 3 is the largest at the position corresponding to the middle of the bristle module 2. In this way, the vibration transmitted to the bristles 22 when brushing teeth can be more effectively reduced. A second abutting surface 112 is correspondingly provided on the bottom surface of the accommodating cavity 110, and the first abutting surface 32 and the second abutting surface 112 are suitable for abutting each other. In a modified embodiment, a mounting block 321 is further provided on the first abutting surface 32 of the counterweight 3. The mounting block 321 extends away from the first abutting surface 32. A mounting groove is provided on the bottom surface of the accommodating cavity 110. The mounting block 321 is adapted to be abutted and installed in the mounting groove. This mounting block 321 can function as the groove 313 to enhance the stability of the counterweight 3. Preferably, the cross-section of the mounting block 321 is smaller than the cross-section of the first abutting surface 32, and the mounting block 321 is located in the center of the first abutting surface 32.

[0054] Further, refer to Figures 5 to 7 The counterweight block 3 is also provided with a third abutting surface 33 on the side close to the bristle module 2. The third abutting surface 33 is also provided with abutting grooves 331 at both ends of the short axis direction of the counterweight block 3. A corresponding abutting block 113 is provided in the accommodating cavity 110. The abutting block 113 is relatively located on the side of the second step surface 111 close to the bristle module 2. The abutting block 113 is suitable for abutting and installing with the abutting groove 331, and the side of the abutting block 113 close to the bristle module 2 is suitable for being relatively flush with the third abutting surface 33.

[0055] In this embodiment, abutment grooves 331 are provided at both ends of the third abutment surface 33, and the abutment block 113 in the accommodating cavity 110 is abutted and installed in the abutment grooves 331. The abutment block 113 limits the counterweight block 3 so that the counterweight block 3 is firmly fixed in the accommodating cavity 110, thereby preventing the counterweight block 3 from detaching from the accommodating cavity 110 due to long-term vibration.

[0056] Specifically, the abutment blocks 113 are located at both ends of the minor axis direction of the counterweight 3, that is, the abutment blocks 113 are along the major axis direction of the counterweight 3, that is, the abutment blocks 113 are along the center line of the rod 12. After installation, the abutment blocks are installed in abutment with the bottom of the abutment groove, and the first step surface 31 and the second step surface 111 are installed in contact with each other. At the same time, the side of the abutment block 113 close to the bristle module 2 is suitable for being relatively flush with the third abutment surface 33, so that the counterweight is completely installed in the accommodating cavity of the head. It is worth noting that a number of positioning grooves 34 are also provided on the third abutment surface 33, and the positioning grooves 34 are spaced apart along the major axis direction of the counterweight 3. This positioning groove 34 is used to fix the counterweight 3 so that the head 11 and the counterweight 3 are integrally formed, thereby enhancing the stability of the connection between the head 11 and the counterweight 3. In a modified embodiment, the counterweight 3 can also be pushed into the accommodating cavity 110, and the abutment blocks 113 are installed in abutment with the abutment groove 331.

[0057] Furthermore, the brush head body 1 also includes a limiting sleeve 13, and a mounting block 212 is provided on the outside of the bristle holder 21. The limiting sleeve 13 is suitable for being mounted on the head 11, and the opening of the limiting sleeve 13 abuts against the side of the mounting block 121 away from the head 11, so that the bristle holder 21 is fixedly installed on the head 11.

[0058] Specifically, refer to Figure 8 The outer wall of the bristle holder 21 is further provided with a mounting block 212. The bottom of the mounting block 212 is adapted to abut against the opening of the accommodating cavity 110 of the head 11 to close the accommodating cavity 110 and enhance the assembly effect of the bristle holder 21 and the head 11. A limiting sleeve 13 is further provided on the outer side of the head 11 of the brush head body 1. The limiting sleeve 13 is sleeved on the bristle holder 21 and the head 11. The bristles 22 on the bristle holder 21 extend out of the limiting sleeve 13. The opening of the limiting sleeve 13 abuts and is fixed to the top of the mounting block 212, and the head 11 is relatively located inside the limiting sleeve 13. The limiting sleeve 13 fixes the bristle holder 21 and the head 11.

[0059] Furthermore, an assembly groove 114 is left between the abutment block 113 and the inner wall of the accommodating chamber 110, and the end of the brush holder 21 close to the bottom surface of the accommodating chamber 110 is suitable for being sleeved on the outside of the abutment block 113 and relatively located in the assembly groove 114, so that the third abutment surface 33 of the counterweight block 3 is relatively located inside the brush holder 21; the end of the brush holder 21 close to the bottom surface of the accommodating chamber 110 is also provided with a second curved surface 211, and the inner wall of the accommodating chamber 110 is also provided with a first curved surface 115 that abuts against the second curved surface 211.

[0060] In this embodiment, one end of the bristle holder 21 close to the bottom surface of the accommodating cavity 110 is suitable for being sleeved on the outside of the abutment block 113 and relatively located in the assembly groove 114, so that the third abutment surface 33 of the counterweight block 3 is relatively located inside the bristle holder 21, reducing the distance between the counterweight block 3 and the bristles 22, and increasing the shock-absorbing effect of the counterweight block 3 on the bristles 22; at the same time, the first curved surface 115 and the second curved surface 211 abut against each other, thereby enhancing the matching effect between the bristle holder 21 and the head 11 of the brush head body 1.

[0061] Specifically, an assembly groove 114 is provided between the abutment block 113 and the inner side wall of the accommodating chamber 110 in the minor axis direction of the counterweight 3. One end of the bristle holder 21 is adapted to be installed in the assembly groove 114 and relatively sleeved on the abutment block 113. The bristle holder 21 is sleeved on the abutment block 113, so that the abutment block 113 and the abutment groove 331 of the counterweight 3 can better match and fit, further increasing the stability of the counterweight 3. A second curved surface 211 is provided on the outer side wall of one end of the bristle holder 21 close to the bottom surface of the accommodating chamber 110, and a first curved surface 115 is correspondingly provided on the bottom of the inner side wall of the accommodating chamber 110. The first curved surface 115 and the second curved surface 211 abut against each other, so that the bristle holder 21 can play a locking and limiting role on the abutment block 113, preventing the abutment block 113 from failing and causing the counterweight 3 to move. In detail, the width of the assembly groove 114 gradually decreases toward the side away from the bristle module 2, so that the end of the bristle seat 21 close to the bottom surface of the accommodating cavity 110 gradually presses against the outer wall of the abutment block 113, so that there is a better limiting effect between the counterweight block 3 and the inner wall of the abutment block 133.

[0062] refer to Figure 3 The present application further provides an electric toothbrush, comprising a toothbrush head and a brush handle according to any of the above embodiments, wherein the brush handle has a transmission shaft 4 connected to the rod portion 12 of the toothbrush head.

[0063] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principles of the present invention, and such improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A toothbrush head, characterized in that: include: A brush head body, the brush head body comprising a stem and a head, the head is arranged at the top of the stem and a receiving cavity is opened on the side of the head; A bristle module, the bristle module comprising a bristle holder and bristles, the bristle holder is mounted in the accommodating cavity, and the bristles are fixedly mounted on the bristle holder; A counterweight block is adapted and fixed in the accommodating cavity and is relatively located between the bottom surface of the accommodating cavity and the bristle seat. A first step surface is provided on the side of the counterweight block away from the bristle module, and a second step surface is provided on the bottom surface of the accommodating cavity. The second step surface is adapted to the first step surface.

2. A toothbrush head according to claim 1, characterized in that: The first step surface includes a plurality of first parts and a plurality of second parts connected in sequence, wherein the first part extends toward the center of the counterweight block, and the second part connects to the end of the first part and extends toward a side away from the bristle module.

3. A toothbrush head according to claim 2, characterized in that: The first step surface further includes a plurality of grooves, which are arranged on the first portion and are recessed toward a side close to the bristle module; The second step surface is also provided with a plurality of protrusions correspondingly, and the protrusions are suitable for matching and installing in the grooves.

4. A toothbrush head according to claim 3, characterized in that: The groove is arranged at the end of the first portion, and the side wall of the groove is relatively flush with the second portion.

5. A toothbrush head according to claim 2, characterized in that: The side of the counterweight block away from the bristle module is further provided with a first abutting surface, and the first abutting surface is provided at an end of the first step surface away from the bristle module; A second abutting surface is correspondingly provided on the bottom surface of the accommodating cavity, and the first abutting surface and the second abutting surface are suitable for abutting against each other; Alternatively, a first abutment surface is further provided on the side of the counterweight block away from the bristle module, and the first abutment surface is arranged at an end of the first step surface away from the bristle module. A mounting block is also provided on the first abutment surface, and the mounting block extends to the side away from the first abutment surface. A mounting groove is provided on the bottom surface of the accommodating cavity, and the mounting block is abutted and installed in the mounting groove.

6. A toothbrush head according to any one of claims 1 to 5, characterized in that: The cross section of the counterweight block is oval, the long axis direction of the counterweight block is along the center line of the rod, and the counterweight block and the bristles are arranged on both sides of the center line of the rod.

7. A toothbrush head according to claim 6, characterized in that: A third abutting surface is also provided on the side of the counterweight block close to the bristle module group, and abutting grooves are also provided on the third abutting surface at both ends of the counterweight block in the short axis direction. Abutting blocks are correspondingly provided in the accommodating cavity, and the abutting blocks are relatively located on the side of the second step surface close to the bristle module group. The abutting block is suitable for abutting and mounting with the abutting groove, and the side of the abutting block close to the bristle module group is suitable for being relatively flush with the third abutting surface.

8. A toothbrush head according to claim 7, characterized in that: The third abutting surface is also provided with a plurality of positioning grooves, which are arranged at intervals along the long axis direction of the counterweight block; And / or, the brush head body also includes a limiting sleeve, and a mounting block is also provided on the outside of the bristle holder, the limiting sleeve is suitable for being mounted on the head and the opening of the limiting sleeve abuts against the side of the mounting block away from the head, so that the bristle holder is fixedly mounted on the head.

9. A toothbrush head according to claim 7, characterized in that: An assembly groove is also reserved between the abutment block and the inner side wall of the accommodating cavity, and one end of the bristle holder close to the bottom surface of the accommodating cavity is suitable for being sleeved on the outside of the abutment block and relatively located in the assembly groove, so that the third abutment surface of the counterweight block is relatively located inside the bristle holder; A second curved surface is further provided at one end of the bristle holder close to the bottom surface of the accommodating cavity, and a first curved surface abutting against the second curved surface is correspondingly provided on the inner side wall of the accommodating cavity.

10. An electric toothbrush, characterized in that: include: A toothbrush head and a brush handle as described in any one of claims 1 to 9, wherein the brush handle has a transmission shaft, and the transmission shaft is connected to the rod portion of the toothbrush head.

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