Electric toothbrush and replacement head thereof

Abstract

The utility model discloses an electric toothbrush and a toothbrush replacement head thereof. The electric toothbrush replacement head comprises a brush rod and a brush head connected with the brush rod, the brush rod comprises a body, the body comprises a barrel-shaped barrel wall, the barrel wall comprises a first end and a second end which are opposite, the first end is connected with the brush head, the end face of the second end sinks towards the first end to form an insertion groove for a motor shaft of the main machine to be inserted in a matched mode, and an open hole is formed in the middle of the barrel wall of the body and extends in the length direction of the barrel wall; and the soft rubber block is embedded in the open hole and is used for abutting against the outer wall surface of the motor shaft. The replacement head of the electric toothbrush not only has a simple structure, but also reduces the processing cost.

Description

Technical Field

[0001] This utility model relates to the field of oral care technology, and in particular to an electric toothbrush and its replacement head. Background Technology

[0002] Toothbrushes, as an indispensable oral care tool in daily life, play a crucial role in maintaining oral health. With continuous technological advancements, electric toothbrushes have emerged. Thanks to their significant advantages such as efficient cleaning, portability, and excellent cleaning results, electric toothbrushes have gradually become the first choice for many consumers, and their popularity in the market continues to rise.

[0003] Currently, electric toothbrushes on the market typically consist of two parts: the main unit and replaceable brush heads. The main unit contains a built-in motor shaft, while the replaceable brush head comprises a brush handle and a brush head. The brush handle has a hole specifically designed to insert the motor shaft. During actual use, the motor shaft of the main unit is inserted into the hole of the replaceable brush head. The high-speed rotation of the motor shaft generates power, thereby driving the replaceable brush head to effectively clean the mouth.

[0004] To ensure a stable connection between the motor shaft and the toothbrush replacement head's shaft hole, existing electric toothbrush replacement heads use a bottom plug inside the shaft hole to effectively secure the motor shaft. However, this type of electric toothbrush replacement head has a complex structure, and the assembly requirements for the bottom plug within the shaft hole are high, increasing the manufacturing cost of the electric toothbrush replacement head. Utility Model Content

[0005] The main objective of this invention is to provide an electric toothbrush and its replacement head that are simple in structure and have low processing costs.

[0006] To achieve the above objectives, this utility model proposes an electric toothbrush replacement head for connection to the main unit of an electric toothbrush; the electric toothbrush replacement head includes a brush handle and a brush head connected to the brush handle; the brush handle includes:

[0007] The body includes a cylindrical wall, which includes a first end and a second end opposite to each other. The first end is connected to the brush head, and the end face of the second end is recessed toward the first end to form a slot for the motor shaft of the host to be fitted and inserted. An opening is provided in the middle of the cylindrical wall of the body, and the opening extends along the length direction of the cylindrical wall.

[0008] A soft rubber block is embedded in the opening and is used to abut against the outer wall surface of the motor shaft.

[0009] Optionally, the brush head includes a brush plate and bristles fixed on the brush plate; the opening includes a first opening, and the soft rubber block includes a first soft rubber block, which is embedded in the first opening.

[0010] Optionally, the first soft rubber block includes a first inner wall surface embedded in the first opening, and the first inner wall surface includes a protruding arc surface, the protruding arc surface of the first inner wall surface being used to abut against the outer wall surface of the motor shaft.

[0011] Optionally, the first soft rubber block includes a first inner wall surface embedded in the first opening, and a portion of the first inner wall surface is formed with a second concave-convex surface, the second concave-convex surface being used to abut against the outer wall surface of the motor shaft.

[0012] Optionally, the first soft rubber block includes a first inner wall surface embedded in the first opening, and a second concave-convex surface is formed on the first inner wall surface. The second concave-convex surface is used to mesh with the first concave-convex surface provided at the upper end of the motor shaft (301).

[0013] Optionally, a portion of the first inner wall surface is formed with a convex arc surface, and the second concave-convex surface is located on the convex arc surface.

[0014] Optionally, the opening further includes a second opening, which is disposed on opposite sides of the cylinder wall as the first opening; the soft rubber block further includes a second soft rubber block, which is embedded in the second opening; the first soft rubber block and / or the second soft rubber block are used to abut against the outer wall surface of the motor shaft.

[0015] Optionally, the second soft rubber block includes a second inner wall surface that is embedded in the second opening, and the second inner wall surface is provided with a limiting groove that engages with the outer wall surface of the motor shaft.

[0016] Optionally, the body has an annular groove on its cylindrical wall, and the opening is located in the annular groove; the brush rod also includes a soft sleeve, which is sleeved in the annular groove; and the soft rubber block is disposed on the inner wall of the soft sleeve.

[0017] Optionally, the outer wall surface of the flexible sleeve is coplanar with the outer surface of the cylinder wall.

[0018] Optionally, the soft rubber block includes a first peripheral sidewall, which is connected to the second peripheral sidewall of the opening.

[0019] Optionally, one of the first peripheral sidewalls of the soft rubber block and the second peripheral sidewall of the opening is provided with a retaining block, and the other is provided with a retaining groove corresponding to the retaining block. The retaining block and the retaining groove retain each other to fix the soft rubber block in the opening.

[0020] Optionally, both the retaining block and the retaining groove extend along the length of the cylinder wall.

[0021] Optionally, an inner sleeve extends into the slot toward the second end of the cylinder wall. The inner sleeve has a first through hole through which the motor shaft passes, and the free end of the inner sleeve is used to abut against the middle of the motor shaft.

[0022] Optionally, the second end of the cylinder wall is provided with a bottom cover, which is engaged with the inner side of the cylinder wall. The bottom cover is provided with a second through hole, which communicates with the slot.

[0023] Optionally, a metal block is provided inside the bottom cover.

[0024] This utility model also proposes an electric toothbrush, which includes a toothbrush replacement head and a main unit, with a motor shaft protruding from the upper end of the main unit; the motor shaft is inserted into the toothbrush replacement head; the toothbrush replacement head is the toothbrush replacement head structure of any of the above embodiments.

[0025] Compared to existing electric toothbrush replacement heads, this invention offers the following advantages: The structure of this electric toothbrush replacement head allows for the direct machining of a slot on the brush handle for assembling the main motor shaft, saving on connecting components. Simultaneously, an opening is provided in the middle of the brush handle's wall for assembling a soft rubber block, which is softer than the brush handle material. This soft rubber block is securely embedded in the opening, providing better elastic contact with the motor shaft and significantly enhancing the fixation between the toothbrush replacement head and the motor shaft. Therefore, this electric toothbrush replacement head not only has a simple structure but is also easy to manufacture, significantly reducing processing costs, and improving both its performance and lifespan. Attached Figure Description

[0026] 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 the structures shown in these drawings without creative effort.

[0027] Figure 1 This is a structural schematic diagram of an embodiment of the electric toothbrush of the present invention, wherein the main unit of the electric toothbrush is a partial structure;

[0028] Figure 2 This is a schematic diagram of the structure of an embodiment of the toothbrush replacement head of this utility model;

[0029] Figure 3 This is a schematic diagram of the structure of a soft rubber block in an embodiment of the toothbrush replacement head of this utility model;

[0030] Figure 4This is a partial structural diagram of an embodiment of the main unit of the electric toothbrush of this utility model;

[0031] Figure 5 This is a cross-sectional structural diagram of an embodiment of the electric toothbrush of the present invention, wherein the main unit of the electric toothbrush is a partial structure;

[0032] Figure 6 This is a cross-sectional structural diagram of another embodiment of the electric toothbrush of this utility model, wherein the main unit of the electric toothbrush is a partial structure;

[0033] Figure 7 This is a partial structural diagram of another embodiment of the toothbrush replacement head of this utility model;

[0034] Figure 8 for Figure 7 A structural diagram of a toothbrush replacement head from another angle;

[0035] Figure 9 This is a schematic diagram of the soft sleeve in the toothbrush replacement head of this utility model;

[0036] Figure 10 This is a cross-sectional structural diagram of another embodiment of the toothbrush replacement head of this utility model;

[0037] Figure 11 This is a cross-sectional structural diagram of another embodiment of the toothbrush replacement head of this utility model;

[0038] Figure 12 This is a schematic diagram of another embodiment of the toothbrush replacement head of this utility model;

[0039] Figure 13 This is a cross-sectional structural diagram of an embodiment of the electric toothbrush of this utility model, wherein the main unit of the electric toothbrush is a partial structure.

[0040] To better illustrate the toothbrush replacement head structure, some of the structures in the accompanying drawings have been enlarged.

[0041] Explanation of icon numbers:

[0042] Electric toothbrush-1;

[0043] Toothbrush replacement head - 100;

[0044] Brush rod-10; Slot-101; Inner sleeve-102; First through hole-103;

[0045] Body - 12; First end - 12a; Second end - 12b; Cylinder wall - 121; End face - 122; Annular groove - 123;

[0046] Opening-13; First opening-131; Second opening-132; Second peripheral sidewall-133; Holding block-1331;

[0047] Soft rubber block-14; First soft rubber block-141; First inner wall surface-1411; Arc surface-1412; Second concave-convex surface-1413; Outer wall surface-1414; Second soft rubber block-142; Second inner wall surface-1421; Limiting groove-1422; First peripheral side wall-143; Holding groove-1431;

[0048] Soft sleeve-15;

[0049] Brush head - 20; Brush plate - 21; Brush bristles - 22;

[0050] Bottom cover -30; Second through hole -31;

[0051] Main unit - 300; Motor shaft - 301; First flat position - 302; First concave-convex surface - 3021; ​​Step surface - 303; Second flat position - 304.

[0052] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0053] 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.

[0054] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0055] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0056] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0057] This utility model proposes a novel electric toothbrush structure, and in particular, a toothbrush replacement head structure for an electric toothbrush.

[0058] Reference Figure 1 and Figure 2 The electric toothbrush 1 includes a toothbrush replacement head 100 and a main unit 300, as well as a motor assembly, control circuit, power supply, and other structures (not shown) located within the main unit 300. The main unit 300 can also be referred to as the brush handle. The toothbrush replacement head 100 is detachably connected to the main unit 300 for easy replacement. A motor shaft 301 protrudes from one end of the main unit 300 facing the toothbrush replacement head 100, and a slot 101 is recessed at the end of the toothbrush replacement head 100 near the main unit 300. The motor shaft 301 is inserted into the slot 101 of the toothbrush replacement head 100, thereby mounting the toothbrush replacement head 100 onto the main unit 300. When the motor assembly is working, the motor shaft 301 transmits power to the toothbrush replacement head 100, thereby driving the toothbrush replacement head 100 to rotate or vibrate, achieving efficient oral cleaning.

[0059] Combined with reference Figure 2 In one embodiment of the present invention, the toothbrush replacement head 100 includes a brush handle 10 and a brush head 20 connected to the brush handle 10.

[0060] The brush handle 10 includes a body 12 and a soft rubber block 14. Among them,

[0061] The body 12 includes a cylindrical wall 121, which includes a first end 12a and a second end 12b. The first end 12a is connected to the brush head 20, and the end face 122 of the second end 12b is recessed toward the first end 12a to form a slot 101. The slot 101 is for the motor shaft 301 of the host 300 to be inserted and assembled.

[0062] The main body 12 has an opening 13 in the middle of the cylindrical wall 121, and the opening 13 extends along the length direction of the cylindrical wall 121. The length direction of the cylindrical wall 121 is the direction in which the first end 12a of the cylindrical wall 121 extends towards the second end 12b.

[0063] The soft rubber block 14 is embedded in the opening 13. The soft rubber block 14 is used to abut against the outer wall surface of the motor shaft 301, thereby holding the motor shaft 301 in the slot 101.

[0064] This utility model of an electric toothbrush replacement head eliminates the need for connecting components by directly machining a slot for assembling the main motor shaft onto the brush handle. Simultaneously, an opening is provided in the middle of the brush handle's wall for mounting a softer rubber block. This soft rubber block is securely embedded in the opening, providing better elastic contact with the motor shaft and significantly enhancing the fixation between the toothbrush replacement head and the motor shaft. Therefore, this utility model of an electric toothbrush replacement head not only has a simple structure but is also easy to manufacture, significantly reducing processing costs, and improving the performance and lifespan of the electric toothbrush replacement head.

[0065] Furthermore, in conjunction with reference Figure 1 , Figure 2 and Figure 3 In one embodiment, the brush head 20 includes a brush plate 21 and bristles 22 fixed on the brush plate 21. The opening 13 includes a first opening 131; the soft rubber block 14 includes a first soft rubber block 141, which is embedded in the first opening 131. Figure 2 The first opening 131 is located on the side away from the bristles 22. It can be understood that the first opening 131 can also be located on the side closer to the bristles 22.

[0066] The first soft rubber block 141 includes an inner wall surface 1411 and an outer wall surface 1414 disposed opposite to each other, with the surface embedded in the first opening 131 being the first inner wall surface 1411. When the first soft rubber block 14 is embedded in the first opening 13, the inner wall surface 1411 fits and abuts against the outer wall of the motor shaft 301. Since the first soft rubber block 14 is elastic, the first inner wall surface 1411 of the first soft rubber block 14 and the motor shaft 301 can also achieve an interference fit, so that the first inner wall surface 1411 of the first soft rubber block 14 and the inner wall of the slot 101 together fix the motor shaft 301.

[0067] Furthermore, when the first soft rubber block 14 is embedded in the first opening 13, its outer wall surface 1414 can be coplanar with the outer wall surface of the cylinder wall 121. This makes the toothbrush replacement head more aesthetically pleasing.

[0068] Furthermore, in conjunction with reference Figure 2 , Figure 4 and Figure 5In one embodiment, the lower end of the motor shaft 301 is cylindrical, and the upper end of the motor shaft 301 includes a first flat portion 302. A first concave-convex surface 3021 is formed on the upper part of the first flat portion 302, and a second concave-convex surface 1413 is formed on the first inner wall surface 1411 of the first soft rubber block 141. When the motor shaft 301 is inserted into the slot 101, the free end of the motor shaft 301 presses against the first inner wall surface 1411, causing the first inner wall surface 1411 to deform. After the motor shaft 301 is installed in place, the first inner wall surface 1411 returns to its original shape, and the second concave-convex surface 1413 engages with the first concave-convex surface 3021 of the motor shaft 301, thereby fixing the motor shaft 301.

[0069] In another embodiment, if the first concave-convex surface 3021 is not provided on the motor shaft 301, the second concave-convex surface 3021 provided on the first soft rubber block 141 can also abut against the outer wall surface of the motor shaft 301. The second concave-convex surface 3021 increases the contact area between the motor shaft 301 and the outer wall surface, thereby increasing the frictional force between the two.

[0070] In another embodiment, refer to Figure 6 The first soft rubber block 141 includes a first inner wall surface 1411 embedded in the first opening 131, and the first inner wall surface 1411 includes a protruding arc surface 1412. The protruding arc surface of the first soft rubber block 141 extends into the slot 101. When the motor shaft 301 is inserted into the slot 101, the free end of the motor shaft 301 presses against the protruding arc surface 1412 of the first inner wall surface 1411, causing the protruding arc surface 1412 to deform. After the motor shaft 301 is installed in place, the protruding arc surface 1412 returns to its original shape, and the protruding arc surface 1412 abuts against the outer wall surface of the motor shaft 301, thereby fixing the motor shaft 301. Furthermore, in this embodiment, a concave-convex surface structure can also be provided, such as the second concave-convex surface 1413 formed on the protruding arc surface 1412. When the protruding arc surface 1412 abuts against the outer wall surface of the motor shaft 301, the second concave-convex surface 1413 engages with the first concave-convex surface 3021 of the motor shaft 301 to fix the motor shaft 301.

[0071] Furthermore, in conjunction with reference Figure 7 , Figure 8 , Figure 9 and Figure 10 In one embodiment, the cylinder wall further includes a second opening 132 disposed on the opposite side of the first opening 131, that is, the second opening 132 and the second opening 131 are located on opposite sides in the radial direction of the cylinder wall 121. Correspondingly, the soft rubber block 14 also includes a second soft rubber block 142, which is embedded in the second opening 132 for abutting against the outer wall surface of the motor shaft 301. Further, referring to reference... Figure 1 , Figure 7 , Figure 9 and Figure 10The motor shaft 301 also includes a second flat part 304 opposite to the first flat part 302. The second soft rubber block 142 includes a second inner wall surface 1421 embedded in the second opening 132, and the second inner wall surface 1421 is provided with a limiting groove 1422 for engaging with the second flat part 304 of the motor shaft 301. Of course, the side opposite to the first flat part 304 can also be an arc surface, then the second inner wall surface 1421 of the second soft rubber block 142 is also correspondingly set as an arc surface, so that the second soft rubber block 142 fits better with the outer wall surface of the motor shaft 301.

[0072] The first soft rubber block 141 and the second soft rubber block 142 mentioned above can both abut against the outer wall surface of the motor shaft 301, making the assembly of the motor shaft 301 in the slot 101 more stable. Of course, the first soft rubber block 141 and the second soft rubber block 142, one of which is used to abut against the outer wall surface of the motor shaft 301 and the other to limit the position of the motor shaft 301, can also make the assembly of the motor shaft 301 in the slot 101 more stable.

[0073] Furthermore, referring to Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11 In one embodiment, the cylindrical wall 121 of the body 21 is provided with an annular groove 123, and the opening 13 is located within the annular groove 123. Correspondingly, the brush rod 10 also includes a soft sleeve 15, the inner wall of which protrudes to form a soft rubber block 14, and the soft sleeve 15 is sleeved in the annular groove 123. Through the sleeve of the soft sleeve 15, the soft rubber block 14 can be protected, and the soft rubber block 14 can be more stably embedded in the opening 13 without falling out.

[0074] Furthermore, referring to Figure 2 and Figure 3 The first soft rubber block 141 also includes a peripheral sidewall 143 connecting the outer wall surface 1414 and the inner wall surface 1411. The first opening 131 includes two opposing second peripheral sidewalls 133. When the first soft rubber block 141 is inserted into the first opening 131, the peripheral sidewalls 143 of the first soft rubber block 141 and the second peripheral sidewalls 133 of the first opening 131 are mutually engaged and connected.

[0075] Specifically, the first soft rubber block 141 has a retaining groove 1431 on its first peripheral sidewall 143, which extends from the first inner wall surface 1411 toward the outer wall surface 1414; the first opening 13 has a retaining block 1331 on its second peripheral sidewall 133, which extends perpendicular to the cylinder wall 121. When the first soft rubber block 141 is assembled into the first opening 13, the retaining block 1331 is aligned with the retaining groove 1431, so that the retaining block 1331 enters the retaining groove 1431 and slides within the retaining groove 1431 until it slides into place, thus fixing the first soft rubber block 141 into the first opening 131.

[0076] In an alternative embodiment, the aforementioned retaining groove 1431 may be disposed on the second peripheral sidewall 133 of the first opening 13, and the retaining block 1331 may be disposed on the first peripheral sidewall 143 of the first soft rubber block 14.

[0077] Furthermore, the cross-section of the aforementioned retaining block 1331 can be a trapezoidal, circular, square, triangular, or other irregular structure, and the cross-section of the retaining groove 1431 is consistent with the cross-section of the retaining block 1331.

[0078] Furthermore, to enhance the connection between the first soft rubber block 14 and the first opening 13, the retaining block 1331 and the retaining groove 1431 can be interference-fitted. Since the retaining groove 1431 is made of a soft material, when the retaining block 1331 enters the retaining groove 1431, the retaining groove 1431 deforms outwards. When the retaining block 1331 is fully inserted into the retaining groove 1431, the deformation force of the retaining groove 1431 compresses the retaining block 1331, thereby tightly wrapping the retaining block 1331 and making the connection between the first soft rubber block 141 and the first opening 131 more stable.

[0079] Furthermore, referring to Figure 12 The aforementioned retaining block 1331 and retaining groove 1431 both extend along the extension direction of the first opening 131, i.e., the length direction of the cylinder wall 121. The first soft rubber block 141 can be embedded in the first opening 131 through secondary injection molding. The first soft rubber block 141 is inserted into the slot 101 of the motor shaft 301. The motor shaft 301 applies a force to the first soft rubber block 141 in the direction perpendicular to the cylinder wall 121. Therefore, the retaining block 1331 and retaining groove 1431 provided in this embodiment can prevent the first soft rubber block 141 from coming out of the first opening 131 due to the force of the motor shaft 301.

[0080] It is understood that the connection between the second soft rubber block 142 and the second opening 132 can be implemented with reference to the connection structure between the first soft rubber block 141 and the first opening 131.

[0081] Furthermore, in conjunction with reference Figure 1 , Figure 5A stepped surface 303 is formed at the connection between the lower and upper ends of the motor shaft 301. An inner sleeve 102 extends from the slot 101 toward the second end 12b of the cylinder wall 121, and the inner sleeve 102 has a first through hole 103 through which the motor shaft 301 passes. The motor shaft 301 enters the slot 101 and is inserted through the first through hole 103 toward the first end 12a of the cylinder wall 121 until the stepped surface 303 of the motor shaft 301 abuts against the free end face of the inner sleeve 102.

[0082] The size of the slot 101 provided on the body 12 gradually decreases from the second end 12b of the body 12 toward the first end 12a. The slot 101 extends from the second end 12b of the body 12 to the first end 12a of the body 12, which can reduce the weight of the toothbrush replacement head and increase the amplitude frequency. At the same time, it can also prevent the toothbrush replacement head from having excessively thick glue and causing appearance defects due to thermal expansion and contraction during production.

[0083] Furthermore, in one embodiment, in conjunction with reference to Figure 10 , Figure 11 , Figure 13 The second end 12b of the cylindrical wall 121 is provided with a bottom cover 30, which is snapped into the inner side of the cylindrical wall 121. The bottom cover 30 is provided with a second through hole 31, which communicates with the slot 101. The bottom cover 30 facilitates the processing of the inner cavity structure of the toothbrush head's handle 10. After processing the two parts separately, they are assembled together, improving processing efficiency.

[0084] Furthermore, a metal block (not shown in the figure) is provided inside the bottom cover 30. By providing the metal block, the second end 12b of the cylinder wall 121 is made heavier, thereby improving the vibration effect of the toothbrush head.

[0085] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A replacement head for an electric toothbrush, for connection to the main unit (300) of an electric toothbrush; characterized in that, The electric toothbrush replacement head (100) includes a brush handle (10) and a brush head (20) connected to the brush handle (10); the brush handle (10) includes: The body (12) includes a cylindrical wall (121) that is cylindrical in shape. The cylindrical wall (121) includes a first end (12a) and a second end (12b) that are opposite each other. The first end (12a) is connected to the brush head (20). The end face (122) of the second end (12b) is recessed toward the first end (12a) to form a slot (101) for the motor shaft (301) of the host (300) to be fitted and inserted. The cylindrical wall (121) of the body (12) is provided with an opening (13) in the middle. The opening (13) extends along the length direction of the cylindrical wall (121). A soft rubber block (14) is embedded in the opening (13) for contacting the outer wall surface of the motor shaft (301).

2. The electric toothbrush replacement head as described in claim 1, characterized in that, The brush head (20) includes a brush plate (21) and bristles (22) fixed on the brush plate (21); the opening (13) includes a first opening (131), and the soft rubber block (14) includes a first soft rubber block (141), which is embedded in the first opening (131).

3. The electric toothbrush replacement head as described in claim 2, characterized in that, The first soft rubber block (141) includes a first inner wall surface (1411) embedded in the first opening (131), and the first inner wall surface (1411) includes a protruding arc surface (1412), the protruding arc surface of the first inner wall surface (1411) being used to abut against the outer wall surface of the motor shaft (301).

4. The electric toothbrush replacement head as described in claim 2, characterized in that, The first soft rubber block (141) includes a first inner wall surface (1411) embedded in the first opening (131), and a second concave-convex surface (1413) is formed on the first inner wall surface (1411). The second concave-convex surface (1413) is used to abut against the outer wall surface of the motor shaft (301).

5. The electric toothbrush replacement head as described in claim 2, characterized in that, The first soft rubber block (141) includes a first inner wall surface (1411) embedded in the first opening (131), and a second concave-convex surface (1413) is formed on the first inner wall surface (1411). The second concave-convex surface (1413) is used to mesh with the first concave-convex surface (3021) provided at the upper end of the motor shaft (301).

6. The electric toothbrush replacement head as described in claim 4 or 5, characterized in that, The first inner wall surface (1411) has a convex arc surface (1412) formed on the upper part, and the second concave-convex surface (1413) is located on the convex arc surface (1412).

7. The electric toothbrush replacement head as described in claim 2, characterized in that, The opening (13) further includes a second opening (132), which is disposed on opposite sides of the first opening (131) of the cylinder wall (121); the soft rubber block (14) further includes a second soft rubber block (142), which is embedded in the second opening (132); the first soft rubber block (141) and / or the second soft rubber block (142) are used to abut against the outer wall surface of the motor shaft (301).

8. The electric toothbrush replacement head as described in claim 7, characterized in that, The second soft rubber block (142) includes a second inner wall surface (1421) embedded in the second opening (132), and the second inner wall surface (1421) is provided with a limiting groove (1422) for engaging with the outer wall surface of the motor shaft (301).

9. The electric toothbrush replacement head as described in claim 1, characterized in that, The body (21) has an annular groove (123) on its cylindrical wall (121), and the opening (13) is located in the annular groove (123); the brush rod (10) also includes a soft sleeve (15), which is sleeved in the annular groove (123); the soft rubber block (14) is provided on the inner wall of the soft sleeve (15).

10. The electric toothbrush replacement head as described in claim 9, characterized in that, The outer wall surface of the soft sleeve (15) is coplanar with the outer surface of the cylinder wall (121).

11. The electric toothbrush replacement head as described in claim 1, characterized in that, The soft rubber block (14) includes a first peripheral sidewall (143), which is connected to the second peripheral sidewall (133) of the opening (13).

12. The electric toothbrush replacement head as described in claim 11, characterized in that, The first peripheral sidewall (143) of the soft rubber block (14) and the second peripheral sidewall (133) of the opening (13) are provided with a retaining block (1331) on one side and a retaining groove (1431) corresponding to the retaining block (1331) on the other side. The retaining block (1331) and the retaining groove (1431) retain each other and fix the soft rubber block (14) to the opening (13).

13. The electric toothbrush replacement head as described in claim 12, characterized in that, Both the retaining block (1331) and the retaining groove (1431) extend along the length of the cylinder wall (121).

14. The electric toothbrush replacement head as described in claim 1, characterized in that, An inner sleeve (102) extends from the slot (101) toward the second end (12b) of the cylinder wall (121). The inner sleeve (102) has a first through hole (103) through which the motor shaft (301) passes, and the free end of the inner sleeve (102) is used to abut against the middle of the motor shaft (301).

15. The electric toothbrush replacement head as described in claim 1, characterized in that, The second end (12b) of the cylindrical wall (121) is provided with a bottom cover (30), the bottom cover (30) is engaged with the inner side of the cylindrical wall (121), the bottom cover (30) is provided with a second through hole (31), and the second through hole (31) communicates with the slot (101).

16. The electric toothbrush replacement head as described in claim 14, characterized in that, The bottom cover (30) contains a metal block.

17. An electric toothbrush, characterized in that, The electric toothbrush (1) includes a toothbrush replacement head (100) and a main unit (300). A motor shaft (301) protrudes from the upper end of the main unit (300). The motor shaft (301) is inserted into the toothbrush replacement head (100). The toothbrush replacement head is the toothbrush replacement head as described in any one of claims 1-16.

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