Electric toothbrush head and electric toothbrush

Abstract

The electric toothbrush head and the electric toothbrush provided by the embodiment of the application relate to the technical field of electric toothbrushes, and the electric toothbrush head comprises a shell, a mounting cavity and a containing cavity, the containing cavity is communicated with the mounting cavity, a brush head assembly, a support and a bristle head, the support is fixedly installed in the mounting cavity, the support has a matching hole, the bristle head comprises a rotating connection part, a limiting part and a linkage shaft, the rotating connection part is rotatably matched with the matching hole, the limiting part is connected with the rotating connection part, and the linkage shaft is eccentrically arranged with the rotating connection part, a driving assembly, a push rod and an elastic piece, the push rod is movably arranged in the containing cavity, one end of the push rod is rotatably connected with the linkage shaft, the other end of the push rod is used for being matched with a main shaft, the elastic piece is arranged in the mounting cavity, and the elastic piece is used for driving the push rod to move in a direction away from the linkage shaft. The embodiment of the application can simplify the structural design of the brush head assembly, is beneficial to simplifying the assembly process of the electric toothbrush head, and reduces the cost of the electric toothbrush head.

Description

Technical Field

[0001] This application relates to the field of electric toothbrush technology, and more particularly to an electric toothbrush head and an electric toothbrush. Background Technology

[0002] Related technology describes an electric toothbrush head with left and right rotation function. The brush head contains a rotatable brush, a rotor for driving the brush, and a pull rod eccentrically mounted on the rotor for pulling the rotor to rotate. A pressure plate is movably sleeved on the rotor surface, and the pressure plate has protrusions that engage with the inside of the brush head to confine the rotor within the brush head. This brush head, by using the brush, pressure plate, rotor, and locking mechanism, and utilizing the pressure plate to confine the rotor within the brush head, allows the rotor to rotate stably inside the brush head. However, this brush head has a complex structure, a relatively cumbersome assembly process, and a high cost. Utility Model Content

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes an electric toothbrush head and an electric toothbrush, which can effectively simplify the assembly process of the electric toothbrush head and reduce the cost of the electric toothbrush head.

[0004] An embodiment of the first aspect of this application provides an electric toothbrush head, comprising:

[0005] The housing has a mounting cavity and a receiving cavity, the receiving cavity being in communication with the mounting cavity;

[0006] A brush head assembly includes a bracket and a bristle-planting head. The bracket is fixedly installed in the mounting cavity and has a mating hole. The bristle-planting head includes a rotating connecting part, a limiting part, and a linkage shaft. The rotating connecting part is rotatably mated with the mating hole. The limiting part is connected to the rotating connecting part. The linkage shaft is installed on the limiting part and is eccentrically disposed with respect to the rotating connecting part.

[0007] The drive assembly includes a push rod and an elastic element. The push rod is movably disposed within the receiving cavity. One end of the push rod is rotatably connected to the linkage shaft, and the other end of the push rod is used to cooperate with the main shaft. The elastic element is disposed within the mounting cavity and is used to drive the push rod to move away from the linkage shaft.

[0008] As can be seen from the above technical solutions, the embodiments of this application have at least the following beneficial effects:

[0009] In the electric toothbrush head provided in this application embodiment, the bristle implantation head can be rotatably engaged with the fitting hole of the bracket via a rotating connecting part. Furthermore, the bristle implantation head can be installed in the mounting cavity of the housing via the bracket. By enabling the bristle implantation head to reciprocate circumferentially around the rotating connecting part as a pivot, the structural design of the brush head assembly can be simplified, facilitating the assembly process of the electric toothbrush head and reducing its cost. Simultaneously, in this application embodiment, the main shaft pushes the push rod towards the linkage shaft, and an elastic element drives the push rod to reset. Thus, the main shaft does not need to be fixed relative to the push rod of the electric toothbrush head, allowing the push rod to reciprocate along its own axis. This simplifies the connection structure between the push rod and the main shaft, further reducing user operating costs. Furthermore, the embodiments of this application, by placing the elastic element within the mounting cavity, allow the elastic element to be closer to the tufting head, enabling the force of the elastic element to be transmitted more directly to the tufting head, driving the tufting head to turn and rotate circumferentially. This improves the force transmission efficiency of the elastic element. When the elastic element is placed within the mounting cavity, its volume is smaller and its deformation amplitude is relatively smaller. Under high-frequency vibration, this reduces the occurrence of resonance, vibration, uncertain deformation, or displacement of the elastic element, which helps improve the working stability of the elastic element, thereby enhancing the stability of the tufting head's circumferential rotation and further reducing working noise.

[0010] Furthermore, the tufting head includes a tufting disc, which is connected to the end of the rotating connection portion away from the limiting portion. The bracket has a mating portion, and a mating hole is formed in the mating portion. The cross-sectional area of ​​the limiting portion is larger than the cross-sectional area of ​​the mating hole, and the mating portion is located between the tufting disc and the limiting portion.

[0011] Furthermore, the bracket includes an abutment portion disposed on the side of the mating portion near the hair-planting disc, and the abutment portion protrudes from the surface of the mating portion, wherein the cross-sectional area of ​​the abutment portion is smaller than the area of ​​the end face of the mating portion near the hair-planting disc.

[0012] Furthermore, along the radial direction of the mating hole, the distance between the mating part and the hair-planting disc gradually decreases.

[0013] Furthermore, the side of the bracket is provided with a notch, which communicates with the mating hole. The minimum distance of the notch is less than the diameter of the rotating connection part. The notch is used to allow the rotating connection part to pass through and move into the mating hole.

[0014] Furthermore, the width of the notch gradually increases along the direction away from the rotating connection.

[0015] Furthermore, the bracket includes a first fixing part located on the side of the bracket near the bottom wall of the mounting cavity. The first fixing part is provided with a guide surface and a receiving groove. The receiving groove is disposed between the guide surface and the tufting head, and the receiving groove is recessed towards the side near the rotating connection part with the tail of the guide surface as a reference. The cavity wall of the mounting cavity is provided with a second fixing part corresponding to the position of the receiving groove. The second fixing part is snapped into the receiving groove, and the second fixing part is partially located between the two side walls of the receiving groove along the circumferential direction of the rotating connection part.

[0016] Furthermore, the cavity wall of the mounting cavity is provided with protruding structures on both sides of each of the first fixing parts, and a limiting groove is defined between two protruding structures. The first fixing part is at least partially located in the limiting groove, and the limiting groove is used to restrict the first fixing part from rotating circumferentially along the rotating connection part.

[0017] Furthermore, the housing is provided with a limiting step at the opening of the mounting cavity, the limiting step being used to abut against the lower end face of the bracket.

[0018] Furthermore, the cavity wall of the mounting cavity is provided with a first positioning part, the push rod is provided with a second positioning part, one end of the elastic member abuts against the first positioning part, the other end of the elastic member is connected to the second positioning part, and the elastic member is located on the extension side of the push rod.

[0019] Furthermore, the elastic element is a spring or a sheet spring.

[0020] Furthermore, the elastic element is a first torsion spring, which has a first connecting end, a torsion spring body, and a second connecting end. The first connecting end is connected to one end of the torsion spring body, and the second connecting end is connected to the other end of the torsion spring body. The bracket is provided with a first connecting hole, and the first connecting end is engaged with the first connecting hole. The torsion spring body is spirally wound around the outer periphery of the limiting part, and the limiting part is provided with a second positioning hole. The second connecting end is engaged with the second positioning hole.

[0021] Furthermore, the elastic element is a second torsion spring, the bracket is provided with a first connecting post, the limiting part is provided with a positioning post, the second torsion spring has a third connecting end and a fourth connecting end, the third connecting end is sleeved on the outer periphery of the first connecting post, and the fourth connecting end is sleeved on the outer periphery of the positioning post.

[0022] Furthermore, the second torsion spring includes a first torsion portion and a second torsion portion. One end of the first torsion portion is connected to the third connecting end, and the other end of the first torsion portion is connected to one end of the second torsion portion. The first torsion portion extends radially along the rotating connecting portion to the rotation axis of the rotating connecting portion. A receiving hole is provided at the center of the limiting portion. The second torsion portion is at least partially located in the receiving hole. The other end of the second torsion portion is connected to the fourth connecting end.

[0023] Furthermore, a second connecting post is provided at the bottom of the mounting cavity, and the elastic element is a third torsion spring. The third torsion spring includes a fixed abutment section, a first helical section and a first elastic driving rod connected in sequence. The fixed abutment section abuts against the cavity wall of the mounting cavity, the first helical section is sleeved on the outer periphery of the second connecting post, the tufting head is provided with an abutment structure, and the first elastic driving rod abuts against the side of the abutment structure.

[0024] Furthermore, a third connecting post is provided at the bottom of the mounting cavity. The third connecting post is concentric with the rotating connecting part. The third connecting post is provided with a first positioning groove. The elastic element is a fourth torsion spring. The fourth torsion spring includes an anti-rotation part, a second helical segment, and a second elastic driving rod connected in sequence. The anti-rotation part cooperates with the first positioning groove. The second helical segment is sleeved on the outer periphery of the third connecting post. The second elastic driving rod is connected to the limiting part to drive the limiting part to rotate.

[0025] Furthermore, the limiting part is provided with a fourth connecting post, which is eccentrically disposed with the rotating connecting part. The fourth connecting post is provided with a second positioning groove, which extends axially along the rotating connecting part and radially along the rotating connecting part. The second elastic drive rod is movably disposed in the second positioning groove.

[0026] An embodiment of the second aspect of this application provides an electric toothbrush, including a handle and an electric toothbrush head as described above. The handle is connected to the housing and has a main shaft. The main shaft abuts against the end of the push rod away from the bristle head. The main shaft is used to drive the push rod to move longitudinally toward the linkage shaft. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of an electric toothbrush head provided in one embodiment of this application;

[0029] Figure 2 This is an exploded structural diagram of an electric toothbrush head provided in one embodiment of this application;

[0030] Figure 3 This is a schematic diagram of the assembly structure of the brush head assembly in an electric toothbrush head according to one embodiment of this application;

[0031] Figure 4 This is an exploded view of the brush head assembly in an electric toothbrush head according to one embodiment of this application;

[0032] Figure 5 This is a top view of an electric toothbrush head according to an embodiment of this application. In the figure, ω represents the swing direction of the bristle head.

[0033] Figure 6 for Figure 5 A schematic diagram of the cross-sectional structure at position AA in the middle;

[0034] Figure 7 for Figure 5 A schematic diagram of the cross-sectional structure at the BB position in the middle;

[0035] Figure 8 for Figure 5 The diagram shows the exploded structure of an electric toothbrush head.

[0036] Figure 9 This is a cross-sectional structural diagram of an electric toothbrush head provided in one embodiment of this application;

[0037] Figure 10 for Figure 9 The diagram shows an explosive structural representation of an electric toothbrush head.

[0038] Figure 11 for Figure 9 The diagram shows another cross-sectional view of the electric toothbrush head.

[0039] Figure 12 for Figure 9 The diagram shows an assembly schematic of a portion of the structure of an electric toothbrush head.

[0040] Figure 13 This is an exploded structural diagram of an electric toothbrush head provided in one embodiment of this application;

[0041] Figure 14 for Figure 13 The diagram shows the assembly of the brush head assembly and the second torsion spring in the electric toothbrush head shown. In the diagram, the fourth connecting end is not engaged with the positioning post.

[0042] Figure 15 This is a cross-sectional structural diagram of an electric toothbrush head provided in one embodiment of this application;

[0043] Figure 16 for Figure 15 The diagram shows the exploded structure of an electric toothbrush head.

[0044] Figure 17 This is an exploded structural diagram of an electric toothbrush head provided in one embodiment of this application.

[0045] Figure label:

[0046] 100. Housing; 110. Mounting cavity; 111. Second fixing part; 112. Protruding structure; 113. First positioning part; 120. Accommodating cavity; 130. Second connecting post; 140. Third connecting post; 141. First positioning groove; 150. Limiting step;

[0047] 200. Brush head assembly; 210. Support; 211. Mating part; 2111. Mating hole; 2112. Notch; 2113. First inclined surface; 212. First fixing part; 2121. Guide surface; 2122. Receiving groove; 213. Abutting part; 214. First connecting hole; 215. Movable groove; 216. Lower end face; 217. First connecting post; 220. Bristle-planting head; 221. Rotating connecting part; 222. Limiting part; 2221. Second positioning hole; 2222. Receiving hole; 223. Linkage shaft; 224. Bristle-planting disc; 225. Central shaft; 226. Positioning post; 227. Abutting structure; 228. Fourth connecting post; 2281. Second positioning groove; 229. Rotation limit block;

[0048] 310. Push rod; 311. First connecting part; 312. Second connecting part; 3121. Connecting body; 3122. Guide structure; 3123. Connecting inclined surface; 313. Second positioning part; 320. Elastic element; 321. First torsion spring; 3211. First connecting end; 3212. Torsion spring body; 3213. Second connecting end; 322. Second torsion spring; 3221. Third connecting end; 3222. Fourth connecting end; 3223. First torsion part; 3224. Second torsion part; 323. Third torsion spring; 3231. Fixed abutment section; 3232. First helical section; 3233. First elastic drive rod; 324. Fourth torsion spring; 3241. Anti-rotation part; 3242. Second helical section; 3243. Second elastic drive rod. Detailed Implementation

[0049] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0050] See Figures 1 to 4 The first aspect of this application discloses an electric toothbrush head, including a housing 100, a brush head assembly 200, and a drive assembly.

[0051] The housing 100 has a mounting cavity 110 and a receiving cavity 120. The mounting cavity 110 is used to mount the brush head assembly 200, and the receiving cavity 120 is in communication with the mounting cavity 110.

[0052] Specifically, the brush head assembly 200 includes a bracket 210 and a bristle implantation head 220. The bracket 210 is fixedly installed in the mounting cavity 110 and has a mating hole 2111. The bristle implantation head 220 includes a rotating connecting part 221, a limiting part 222, and a linkage shaft 223. The rotating connecting part 221 is rotatably mated with the mating hole 2111. The limiting part 222 is connected to the rotating connecting part 221. The linkage shaft 223 is installed on the limiting part 222 and is eccentrically positioned with respect to the rotating connecting part 221.

[0053] The drive assembly includes a push rod 310 and an elastic element 320. The push rod 310 is movably disposed within the receiving cavity 120. One end of the push rod 310 is rotatably connected to the linkage shaft 223, and the other end of the push rod 310 is used to cooperate with the main shaft. The elastic element 320 is disposed within the mounting cavity 110 and is used to drive the push rod 310 to move away from the linkage shaft 223.

[0054] In the above embodiment, the main shaft is used to drive the push rod 310 to move along its own axial direction and toward the side close to the linkage shaft 223, so as to drive the tufting head 220 to rotate circumferentially in the first direction. The elastic element 320 is used to drive the tufting head 220 to rotate circumferentially in the opposite direction of the first direction, and drive the push rod 310 to move toward the side away from the linkage shaft 223. In this way, the tufting head 220 can be reciprocated around the axis of the rotating connection part 221.

[0055] See Figures 1 to 6When the push rod 310 moves along its own axis toward the side closer to the linkage shaft 223, the elastic element 320 is pushed and compressed by the push rod 310. When the main shaft moves toward the side away from the linkage shaft 223, the elastic element 320 can stop the push rod 310 and drive the push rod 310 to move along its own axis toward the side away from the rotating connection part 221. In this way, by the main shaft driving the push rod 310 to move longitudinally, and with the action of the elastic element 320, the push rod 310 can reciprocate along its own axis. As a result, the push rod 310 can drive the linkage shaft 223 to reciprocate, thereby causing the tufting head 220 to reciprocate in a circular motion around the rotating connection part 221.

[0056] It is understandable that the elastic element 320 can be directly connected to the push rod 310 and directly drive the push rod 310 to move. Of course, the elastic element 320 can also be indirectly connected to the push rod 310 to indirectly drive the push rod 310 to move. For example, the elastic element 320 can be connected to the limiting part 222, which drives the tufting head 220 to rotate, so that the tufting head 220 drives the push rod 310 to move through the linkage shaft 223.

[0057] In addition, in some embodiments, the bristle head 220 can be rotatably mounted on the housing 100 with the bracket 210, eliminating the need for a separate central shaft 225, which further simplifies the structure of the brush head assembly 200 and its assembly process.

[0058] In one design, the electric toothbrush uses a spring fitted onto the end of the push rod away from the bristle head to drive the push rod to return to its original position. In this design, because the spring is fitted around the outer circumference of the push rod, the helical radius of the spring needs to be larger than the radius of the push rod. When the electric toothbrush is working, the linear motion of the push rod exhibits high-frequency vibration. Under high-frequency vibration, the spring is prone to resonance, unpredictable deformation, and displacement, which can lead to poor spring stability, significant operating noise, and reduced force transmission efficiency.

[0059] Compared to the above solutions, in the embodiments of this application, by setting the elastic element 320 within the mounting cavity 110, the elastic element 320 can be closer to the tufting head 220, and the force of the elastic element 320 can be transmitted more directly to the tufting head 220 to drive the tufting head 220 to turn and rotate circumferentially, thereby improving the force transmission efficiency of the elastic element 320. In addition, in order to set the elastic element 320 within the mounting cavity 110, the volume of the elastic element 320 needs to be designed to be relatively small. In this way, the deformation range of the elastic element 320 is relatively small. Under high-frequency vibration, it can reduce the occurrence of resonance, vibration, uncertain deformation or displacement of the elastic element 320, which helps to improve the working stability of the elastic element 320, improves the rotational stability of the tufting head 220, and also helps to reduce working noise.

[0060] In some electric toothbrushes, the main shaft is magnetically connected to a push rod 310 within a replaceable brush head. The linear vibration of the main shaft drives the push rod 310 to reciprocate, thereby causing the bristle-implanting head 220 connected to the push rod 310 to oscillate and rotate around a rotation axis. However, this solution requires a magnet to be placed at the end of the main shaft near the connection with the push rod 310, and another magnet or magnetizable element to be placed at the end of the push rod 310 connected to the main shaft. These components are costly, resulting in a higher cost for the brush head.

[0061] In this embodiment, an elastic element 320 is provided in the mounting cavity 110. The elastic element 320 directly or indirectly drives the push rod 310 to reset, so that the push rod 310 can reciprocate along its own axis. By providing the elastic element 320, the need for a magnet to connect the spindle and the push rod 310 is avoided, which helps to reduce costs.

[0062] In the embodiments of this application, the elastic element 320 can be a spring or a torsion spring. When the elastic element 320 is a torsion spring, unlike the force transmission achieved through elastic force or magnetic force, the torsion spring can achieve the force transmission of motion through torque, which has higher force transmission efficiency and better stability.

[0063] It is worth mentioning that the linkage shaft 223 and the limiting part 222 can be fixedly connected, such as the linkage shaft 223 and the limiting part 222 being an integral structure; of course, the linkage shaft 223 can also be installed into the mounting hole of the limiting part 222 by assembly, which is not limited here.

[0064] Further reading is available upon request. Figures 1 to 3 The tufting head 220 includes a tufting disc 224, which is connected to the end of the rotating connection 221 away from the limiting part 222. The support 210 has a mating part 211, and a mating hole 2111 is formed in the mating part 211. The cross-sectional area of ​​the limiting part 222 is larger than the cross-sectional area of ​​the mating hole 2111. The mating part 211 is located between the tufting disc 224 and the limiting part 222. The limiting part 222 cannot pass through the mating hole 2111. Thus, the degree of freedom of the tufting head 220 along the axial direction of the mating hole 2111 is constrained, and the tufting head 220 cannot move relative to the support 210 along the axial direction of the mating hole 2111.

[0065] In one possible implementation, the bristle tuft on the side of the bristle tray 224 away from the rotating connection 221 is provided for cleaning teeth.

[0066] It is understandable that the limiting part 222 and the rotating connecting part 221 can be separate structures or integrally formed structures.

[0067] To further simplify the structural design of the bristle implantation head 220 and the assembly process of the brush head assembly 200, in this embodiment, see... Figure 3 and Figure 4 The bracket 210 has a notch 2112 on its side, which communicates with the mating hole 2111. The minimum distance of the notch 2112 is less than the diameter of the rotating connection part 221. The notch 2112 is used to allow the rotating connection part 221 to pass through and move into the mating hole 2111. In other words, the rotating connection part 221 can be installed into the mating hole 2111 through the aforementioned notch 2112.

[0068] Therefore, the rotating connecting part 221, the limiting part 222, and the bristle tray 224 can be designed as a single integrated structure. This reduces the possibility of increased spacing between the bristle tray 224 and the limiting part 222 due to assembly tolerances, thus minimizing vibration or noise caused by axial runout of the bristle head 220 along the mating hole 2111 during rotation. Furthermore, designing the rotating connecting part 221, the limiting part 222, and the bristle tray 224 as a single integrated structure simplifies the assembly process of the bristle head 220, thereby simplifying the assembly process of the brush head assembly 200 and the electric toothbrush head, and reducing assembly costs.

[0069] Furthermore, since the tufting head 220 is inserted into the mating hole 2111 through the notch 2112 on the side of the bracket 210, the distance between the limiting part 222 and the tufting plate 224 can be designed to be suitable for the rotation of the tufting head 220. While ensuring the rotational stability of the tufting head 220, it can also reduce the axial runout of the tufting head 220 along the mating hole 2111, which helps to reduce vibration and working noise, thereby optimizing the user experience.

[0070] It is understandable that the bracket 210 can undergo a certain degree of elastic deformation. Based on this, when the rotating connecting part 221 enters the mating hole 2111 through the notch 2112 on the side of the bracket 210, the bracket 210 can restore its shape, thus avoiding the situation where the bracket 210 is deformed, which would cause the tufting head 220 to rotate and vibrate or increase the working noise.

[0071] It is worth mentioning that in the embodiments of this application, the shape of the bracket 210 matches the mounting cavity 110. When the bracket 210 is installed into the mounting cavity 110 of the housing 100, the outer contour of the bracket 210 is defined. In addition, the rotating connection 221 engages with the mating hole 2111, and the bracket 210 cannot undergo slight deformation toward the mating hole 2111. Therefore, the stability of the axis of the mating hole 2111 can be guaranteed, thereby allowing the rotating connection 221 to rotate smoothly within the mating hole 2111, which helps to reduce vibration.

[0072] Further reading is available upon request. Figure 3 and Figure 4Along the direction away from the rotating connection 221, the width of the notch 2112 gradually increases. That is, the opening width of the notch 2112 on the side closer to the mating hole 2111 is smaller than the opening width on the side farther from the mating hole 2111. This increases the contact area between the mating hole 2111 and the rotating connection 221, reducing the probability of the rotating connection 221 jumping outwards towards the notch 2112, thus helping to reduce radial runout when the tufting head 220 rotates and reducing vibration. Simultaneously, the gradual increase in the opening width of the notch 2112 along the direction away from the rotating connection 221 facilitates alignment of the rotating connection 221 with the opening of the notch 2112 during assembly, helping to assemble the rotating connection 221 into the mating hole 2111 and improving assembly efficiency.

[0073] For some embodiments of this application, please refer to Figure 3 and Figure 4 The support 210 includes an abutment portion 213, which is disposed on the side of the mating portion 211 near the tufting disc 224. The abutment portion 213 protrudes from the surface of the mating portion 211, and the cross-sectional area of ​​the abutment portion 213 is smaller than the area of ​​the end face of the mating portion 211 near the tufting disc 224. In this embodiment, by providing an abutment portion 213 protruding from the surface of the mating portion 211, the rotational area between the tufting disc 224 and the support 210 is reduced, which helps to reduce the rotational resistance of the tufting head 220 and reduces the driving force required to rotate the tufting head 220. As a result, the vibration of the push rod 310 and the elastic element 320 during operation can be reduced.

[0074] In this embodiment, see Figure 4 and Figure 7 The abutment portion 213 is arranged around the outer periphery of the mating hole 2111, so that the gap between the abutment portion 213 and the tufting disc 224 at different positions around the mating hole 2111 is basically consistent, which helps to reduce the amplitude of shaking when the tufting head 220 rotates, and helps to reduce vibration and noise.

[0075] Further reading is available upon request. Figure 4 and Figure 7 The abutting part 213 is distributed around the center of the end face of the mating part 211 along the radial direction of the mating hole 2111, so that the abutting part 213 can abut against the position of the hair-planting disc 224 as close as possible to the outer edge, which can reduce the large axial swing of the hair-planting disc 224 during rotation and help to further reduce vibration.

[0076] In the embodiments of this application, the tufting head 220 is rotatably mounted in the mating hole 2111 of the bracket 210. In some embodiments, the tufting head 220 does not have a fixed central axis 225, which may cause the tufting head 220 to wobble slightly during reciprocating rotation. That is, the actual rotation axis of the tufting head 220 may not be completely aligned with the axis of the mating hole 2111, making it easy for the tufting disc 224 to come into contact and rub against the side of the bracket 210 near the tufting disc 224 during rotation, generating noise.

[0077] Therefore, in order to reduce the probability of contact between the tufting disc 224 and the support 210, and thus reduce noise, in this embodiment, see... Figure 4 and Figure 7 Along the radial direction of the mating hole 2111, the distance between the mating part 211 and the tufting disc 224 gradually decreases. That is to say, a first inclined surface 2113 is provided on the mating part 2111 near the mating hole 2111. Among the various positions on the first inclined surface 2113, the closer to the mating hole 2111, the greater the distance between the position and the tufting disc 224. In this way, the probability of this part contacting the tufting disc 224 can be reduced, which helps to reduce the vibration and noise when the tufting head 220 rotates, and helps to optimize the user experience.

[0078] In some embodiments of this application, see Figure 3 and Figure 4 A rotation limit block 229 is provided on the outer periphery of the rotating connection part 221, and a movable groove 215 is provided on the bracket 210. The movable groove 215 is connected to the notch 2112. The movable groove 215 is used to accommodate the rotation limit block 229 and to constrain the rotation angle of the rotation limit block 229 so that the tufting head 220 reciprocates within a fixed angle.

[0079] In the above embodiment, the movable groove 215 communicates with the notch 2112, allowing the limiting block 229 to be assembled into the movable groove 215 through the notch 2112. In other words, the step of assembling the limiting block 229 into the movable groove 215 can be completed simultaneously with the step of assembling the rotating connection 221 into the mating hole 2111, simplifying the assembly process. The fact that the limiting block 229 can be assembled into the movable groove 215 through the notch 2112 allows the rotation angle of the bristle head 220 to be constrained by the bracket 210 and the limiting block 229, simplifying the structural design of the brush head assembly 200 and optimizing product costs.

[0080] It is worth understanding that the movable groove 215 is coaxially set with the mating hole 2111, and the arc length of the movable groove 215 is specifically set according to the rotation angle of the tufting head 220.

[0081] In some embodiments of this application, see Figure 2 , Figure 4 and Figure 7The bracket 210 includes a first fixing part 212, which is located on the side of the bracket 210 near the bottom wall of the mounting cavity 110. The first fixing part 212 is provided with a guide surface 2121 and a receiving groove 2122. The receiving groove 2122 is disposed between the guide surface 2121 and the tufting head 220. The receiving groove 2122 is recessed towards the side near the rotating connection part 221 with the tail of the guide surface 2121 as a reference. The cavity wall of the mounting cavity 110 is provided with a second fixing part 111 corresponding to the position of the receiving groove 2122. The second fixing part 111 is engaged with the receiving groove 2122, and the second fixing part 111 is partially located between the two side walls of the receiving groove 2122 in the circumferential direction of the rotating connection part 221.

[0082] When the second fixing part 111 is located in the receiving groove 2122, the bracket 210 cannot be disengaged from the mounting cavity 110 along the axial direction of the mating hole 2111; at the same time, the second fixing part 111 is located between the two sides of the receiving groove 2122, that is, the two sides of the receiving groove 2122 can stop the second fixing part 111, thereby restricting the bracket 210 from rotating in the circumferential direction of the mating hole 2111. In this way, the bracket 210 can be fixed in the mounting cavity 110.

[0083] Further reading is available upon request. Figure 2 , Figure 4 and Figure 7 In some embodiments of this application, the cavity wall of the mounting cavity 110 is provided with protruding structures 112 on both sides of each first fixing part 212, and a limiting groove is defined between the two protruding structures 112. The first fixing part 212 is at least partially located in the limiting groove, and the limiting groove is used to restrict the first fixing part 212 from rotating circumferentially along the rotating connection part 221.

[0084] In practical applications, the shape of the side of the protruding structure 112 near the first fixing part 212 matches the first fixing part 212, and the protruding structure 112 abuts against the first fixing part 212 to reduce the gap between the first fixing part 212 and the protruding structure 112, thereby preventing the first fixing part 212 from becoming loose relative to the limiting groove, which helps to reduce vibration and noise.

[0085] In some embodiments of this application, see Figure 2 , Figure 3 and Figure 7The housing 100 has a limiting step 150 at the opening of the mounting cavity 110, which abuts against the lower end face 216 of the bracket 210. The limiting step 150 supports the lower end face 216 of the bracket 210 and restricts its movement towards the bottom wall of the mounting cavity 110. Through the engagement of the limiting step 150 with the lower end face 216 of the bracket 210, combined with the engagement of the first fixing part 212 and the second fixing part 111, the bracket 210 can be fixed axially in the mating hole 2111.

[0086] It is worth mentioning that the mating hole 2111 is formed on the bracket 210, and the tufting head 220 is rotatably connected to the mating hole 2111 via the rotating connection part 221. When the tufting head 220 rotates only through the virtual axis defined by the mating hole 2111 of the bracket 210, the installation stability of the bracket 210 greatly affects the rotational stability of the tufting head 220. However, the embodiment of this application, through the aforementioned arrangement, ensures a tight fit between the bracket 210 and the housing 100, reducing the possibility of the bracket 210 becoming loose relative to the housing 100. This facilitates the smooth reciprocating rotation of the tufting head 220, effectively reducing noise and vibration, thereby improving the user experience.

[0087] In some embodiments of this application, see Figure 2 The push rod 310 includes a first connecting part 211 and a second connecting part 312. The first connecting part 211 is used to connect with the linkage shaft 223, and the second connecting part 312 is used to abut against the main shaft so as to push the push rod 310 to move through the main shaft.

[0088] Further, see Figure 2 and Figure 6 The second connecting part 312 includes a connecting body 3121 and a guide structure 3122 disposed on the outer periphery of the connecting body 3121. The guide structure 3122 protrudes from the end face of the connecting body 3121. As shown in the figure, the guide structure 3122 and the end face of the connecting body 3121 enclose a receiving space for cooperating with the spindle, for at least partially accommodating the spindle to facilitate the spindle driving the push rod 310 to move.

[0089] The guide structure 3122 can be a solid structure continuously distributed in the circumferential direction of the connecting body 3121, or it can be a structure composed of multiple protrusions spaced apart in the circumferential direction of the connecting body 3121.

[0090] In this embodiment, see Figure 2 and Figure 4 The guide structure 3122 is a structure composed of multiple protrusions spaced apart in the circumferential direction of the connecting body 3121, and the protrusions have three.

[0091] In the above embodiment, in order to allow the electric toothbrush head to be detachably mounted on the handle of the electric toothbrush, the main shaft and the second connecting part 312 of the push rod 310 are configured to be non-fixed connection. That is, during the reciprocating rotation of the bristle head 220, the main shaft and the second connecting part 312 may briefly separate and then re-engage. As a result, vibration and noise are easily generated between the main shaft and the second connecting part 312.

[0092] To address the aforementioned issues, in this embodiment, see... Figure 2 and Figure 4 The guide structure 3122 is provided with a connecting inclined surface 3123 for contacting the main shaft to reduce motion noise.

[0093] The specific structure and assembly method of the elastic element 320 in the electric toothbrush head of the first aspect of this application are described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the following embodiments are merely illustrative descriptions.

[0094] In one embodiment of this application, see Figures 5 to 8 The cavity wall of the mounting cavity 110 is provided with a first positioning part 113, and the push rod 310 is provided with a second positioning part 313. One end of the elastic member 320 abuts against the first positioning part 113, and the other end of the elastic member 320 is connected to the second positioning part 313. The elastic member 320 is located on the extension side of the push rod 310. When the push rod 310 moves along its own axis toward the side closer to the linkage shaft 223, the push rod 310 pushes the tufting head 220 to rotate, while squeezing the elastic member 320. When the force acting on the push rod 310 is removed, the elastic member 320 releases its elastic force, pushing the push rod 310 to move toward the side away from the linkage shaft 223. The push rod 310 drives the tufting head 220 to rotate in the opposite direction. When the push rod 310 moves toward the side closer to the linkage shaft 223 again, the push rod 310 drives the tufting head 220 to reverse and compresses the elastic member 320 again. This cycle is repeated, so that the tufting head 220 can rotate back and forth around the axis of the rotating connection part 221.

[0095] In the above embodiments, the elastic element 320 is designed to provide a counter-pushing force to the push rod 310, and the structure of the elastic element 320 can be varied. For example, the elastic element 320 is a spring or a sheet. The spring can be cylindrical, conical, or irregularly shaped, but is not limited to these shapes; the sheet can be an elastic elastic plate.

[0096] In one possible implementation, see Figures 5 to 8The elastic element 320 is a spring. Specifically, the housing 100 has a first positioning part 113 located on the extended side of the push rod 310. The first positioning part 113 is a groove that can accommodate the spring. The top of the push rod 310 has a second positioning part 313, which is a positioning post 226 protruding from the end of the push rod 310. One end of the spring is located in the groove, and the other end of the spring is sleeved on the outer periphery of the second positioning part 313. In this way, the spring can be positioned, reducing the possibility of the spring failing to work due to it moving out of its designed position during reciprocating extension and retraction. At the same time, in this embodiment, the first positioning part 113, the spring, and the second positioning part 313 are all located on the extended side of the push rod 310, that is, they are all located on the same straight line. Thus, the force exerted by the spring on the push rod 310 is consistent with the direction of movement of the push rod 310, which can reduce the swinging or vibration of the push rod 310, help improve the force transmission efficiency, and reduce working noise.

[0097] In the actual assembly process, the rotating connecting part 221 of the bristle implantation head 220 is inserted into the mating hole 2111 through the notch 2112 on the side of the bracket 210 to assemble the brush head assembly 200. At this time, the bracket 210 is located between the bristle implantation disc 224 and the limiting part 222 of the bristle implantation head 220, which can limit and fix the bristle implantation head 220 in the axial direction of the mating hole 2111. At the same time, the bristle implantation head 220 can rotate relative to the bracket 210 in the mating hole 2111 with the axis of rotation of the mating hole 2111 as the axis of rotation. The spring is then installed on the second positioning part 313 of the push rod 310. Next, the push rod 310 and the spring are inserted into the receiving cavity 120 from the end of the receiving cavity 120 away from the mounting cavity 110, with the first connecting part 311 of the push rod 310 positioned in the mounting cavity 110, while the other end of the elastic member 320 abuts against the first positioning part 113. Then, the brush head assembly 200 is installed entirely into the mounting cavity 110, and connected to the mounting cavity 110 via the bracket 210, thus fixing the brush head assembly 200 within the mounting cavity 110. During the installation of the brush head assembly 200, the linkage shaft 223 of the bristle implantation head 220 engages with the first connecting part 311 of the push rod 310. This completes the assembly of the electric toothbrush head in this embodiment.

[0098] In another embodiment of this application, see [link to application]. Figures 9 to 12The elastic element 320 is a first torsion spring 321. The first torsion spring 321 has a first connecting end 3211, a torsion spring body 3212, and a second connecting end 3213. The first connecting end 3211 is connected to one end of the torsion spring body 3212, and the second connecting end 3213 is connected to the other end of the torsion spring body 3212. The bracket 210 is provided with a first connecting hole 214. The first connecting end 3211 is connected to the first connecting hole 214. The torsion spring body 3212 is spirally wound around the outer periphery of the limiting part 222. The limiting part 222 is provided with a second positioning hole 2221, and the second connecting end 3213 is connected to the second positioning hole 2221.

[0099] When the push rod 310 moves toward the side closer to the linkage shaft 223, the push rod 310 drives the tufting head 220 to rotate through the linkage shaft 223. At the same time, it drives the torsion spring body 3212 to rotate circumferentially around the limiting part 222 and tighten. When the force exerted by the main shaft on the push rod 310 is removed, the elastic potential energy stored in the torsion spring body 3212 is released, causing the tufting head 220 to rotate in the opposite direction. The tufting head 220 drives the push rod 310 to move toward the side away from the linkage shaft 223 through the linkage shaft 223. Then, under the action of the main shaft, the linkage shaft 223 moves toward the side closer to the linkage shaft 223 again. This process is repeated, thereby driving the tufting head 220 to reciprocate around the axis of the rotating connection part 221.

[0100] In the above embodiment, the first torsion spring 321 drives the tufting head 220 to rotate circumferentially through torque. Specifically, the torsion spring body 3212 is coaxially arranged with the tufting head 220, and the torsion spring body 3212 drives the tufting head 220 to rotate circumferentially through the second connecting end 3213. During this process, the direction of the force exerted by the first torsion spring 321 on the tufting head 220 is always tangential to the circumference of the tufting head 220, which helps to improve the stability of the rotation of the tufting head 220. At the same time, compared with driving the tufting head 220 to rotate through elastic force or magnetic force, this embodiment drives the tufting head 220 to rotate circumferentially through torque, which has higher force transmission efficiency and more stable force transmission.

[0101] Furthermore, in the above embodiment, a limiting hole is provided on the bottom wall of the mounting cavity 110. The limiting hole is used to movably connect with one end of the central shaft 225, and the other end of the central shaft 225 is rotatably connected to the limiting part 222 of the tufting head 220. The central shaft 225 and the rotating connection part 221 are coaxially arranged. In this way, the root swing of the tufting head 220 can be reduced, so that the tufting head 220 can make stable circular motion under the constraint of the central shaft 225, which helps to improve the stability of rotation, improve the shock absorption effect, and thus reduce noise.

[0102] It is worth understanding that, in the above embodiments, since the structure and installation position of the second torsion spring 322 will not interfere with the central shaft 225, the swaying of the root of the tufting head 220 can be reduced by setting the central shaft 225.

[0103] In the actual assembly process, a circular hole is provided at the center of the limiting part 222, and the central shaft 225 is installed in the circular hole; another circular hole is provided on one side of the circular hole, and the linkage shaft 223 is installed in the circular hole; then, the rotating connecting part 221 of the bristle head 220 is inserted into the mating hole 2111 through the notch 2112 on the side of the bracket 210 to assemble the brush head assembly 200. At this time, the bracket 210 is located between the bristle plate 224 of the bristle head 220 and the limiting part 222, which can limit and fix the bristle head 220 in the axial direction of the mating hole 2111, while the bristle head 220 can rotate relative to the bracket 210 in the mating hole 2111 with the axis of rotation of the mating hole 2111 as the axis of rotation. Subsequently, the torsion spring body 3212 of the second torsion spring 322 is fitted onto the outer periphery of the limiting part 222, and the first connecting end 3211 is inserted into the first connecting hole 214 of the bracket 210, and the second connecting end 3213 is inserted into the second positioning hole 2221 of the limiting part 222. Next, the push rod 310 is inserted into the receiving cavity 120 from the side of the receiving cavity 120 away from the mounting cavity 110, so that the first connecting part 311 of the push rod 310 is located in the mounting cavity 110. Then, the brush head assembly 200 is installed into the mounting cavity 110 as a whole, and the brush head assembly 200 is fixed in the mounting cavity 110 by the cooperation between the bracket 210 and the mounting cavity 110. At this time, the linkage shaft 223 of the bristle head 220 cooperates with the first connecting part 311 of the push rod 310. In this way, the assembly of the electric toothbrush head of this embodiment can be realized.

[0104] In another embodiment of this application, see [link to application]. Figure 13 and Figure 14 The elastic element 320 is a second torsion spring 322. The bracket 210 is provided with a first connecting post 217, and the limiting part 222 is provided with a positioning post 226. The second torsion spring 322 has a third connecting end 3221 and a fourth connecting end 3222. The third connecting end 3221 is sleeved on the outer periphery of the first connecting post 217, and the fourth connecting end 3222 is sleeved on the outer periphery of the positioning post 226. The positioning post 226 is eccentrically positioned with respect to the rotating connecting part 221.

[0105] Thus, as the push rod 310 moves toward the linkage shaft 223, the relative positions of the third connecting end 3221 and the fourth connecting end 3222 of the second torsion spring 322 change. At this time, the central angle between the third connecting end 3221 and the fourth connecting end 3222 relative to the rotation axis of the tufting head 220 increases, causing the second torsion spring 322 to store elastic potential energy. When the force exerted by the main shaft on the push rod 310 is removed, the elastic potential energy of the second torsion spring 322 is released and drives the tufting head 220 to rotate in the opposite direction via the positioning pin 226. The tufting head 220 then drives the push rod 310 to move away from the linkage shaft 223 via the linkage shaft 223. When the main shaft drives the push rod 310 to move closer to the linkage shaft 223 again, the second torsion spring 322 twists again, and this cycle repeats. In this way, the tufting head 220 can be driven to reciprocate around the axis of the rotating connection part 221.

[0106] It should be pointed out that, Figure 14 In the structure shown, the fourth connecting end 3222 is not fitted onto the outer periphery of the positioning post 226. In the actual assembly process, the fourth connecting end 3222 needs to be fitted onto the positioning post 226 so that the fourth connecting end 3222 can drive the tufting head 220 to rotate through the positioning post 226.

[0107] Further reading is available upon request. Figure 13 and Figure 14 The second torsion spring 322 includes a first torsion portion 3223 and a second torsion portion 3224. One end of the first torsion portion 3223 is connected to the third connecting end 3221, and the other end of the first torsion portion 3223 is connected to one end of the second torsion portion 3224. The first torsion portion 3223 extends radially along the rotating connecting portion 221 to the rotation axis of the rotating connecting portion 221. A receiving hole 2222 is provided at the center of the limiting portion 222. The second torsion portion 3224 is at least partially located in the receiving hole 2222, and the other end of the second torsion portion 3224 is connected to the fourth connecting end 3222. The second torsion portion 3224 and the first torsion portion 3223 are not completely located in the same plane.

[0108] In this embodiment, see Figure 13 and Figure 14 The positioning pin 226 and the push rod 310 are located on the same diameter passing through the axis of the rotating connection 221. That is to say, the rotation axes of the positioning pin 226, the push rod 310 and the rotating connection 221 are located in the same plane.

[0109] In the actual assembly process, the rotating connecting part 221 of the bristle implantation head 220 is inserted into the mating hole 2111 through the notch 2112 on the side of the bracket 210 to assemble the brush head assembly 200. At this time, the bracket 210 is located between the bristle implantation disc 224 and the limiting part 222 of the bristle implantation head 220, which can limit and fix the bristle implantation head 220 in the axial direction of the mating hole 2111. At the same time, the bristle implantation head 220 can rotate relative to the bracket 210 in the mating hole 2111 with the axis of rotation of the mating hole 2111 as the axis of rotation. The second torsion spring 322 is then fixed onto the brush head assembly 200. Next, the push rod 310 is inserted into the receiving cavity 120 from the side of the receiving cavity 120 away from the mounting cavity 110, with the first connecting part 311 of the push rod 310 located within the mounting cavity 110. Then, the entire brush head assembly 200 is inserted into the mounting cavity 110 and connected to it via the bracket 210, thus fixing the brush head assembly 200 within the mounting cavity 110. At this time, the linkage shaft 223 of the bristle implantation head 220 engages with the first connecting part 311 of the push rod 310. This completes the assembly of the electric toothbrush head in this embodiment.

[0110] In another embodiment of this application, see [link to application]. Figure 15 and Figure 16 The bottom of the mounting cavity 110 is provided with a second connecting post 130. The elastic element 320 is a third torsion spring 323. The third torsion spring 323 includes a fixed abutment section 3231, a first spiral section 3232 and a first elastic drive rod 3233 connected in sequence. The fixed abutment section 3231 abuts against the cavity wall of the mounting cavity 110. The first spiral section 3232 is sleeved on the outer periphery of the second connecting post 130. The tufting head 220 is provided with an abutment structure 227. The abutment structure 227 is provided on the limiting part 222. The first elastic drive rod 3233 abuts against the side of the abutment structure 227. When the push rod 310 drives the linkage shaft 223 to rotate, the linkage shaft 223 drives the first elastic drive rod 3233 to rotate through the limiting part 222 and the abutment structure 227, causing the third torsion spring 323 to twist and store elastic potential energy. When the force exerted by the main shaft on the push rod 310 is removed, the third torsion spring 323 drives the abutment structure 227 to rotate in the opposite direction through the first elastic drive rod 3233. This process is repeated, which allows the tufting head 220 to reciprocate around the axis of the rotating connection part 221.

[0111] In this embodiment, see Figure 16 The abutment structure 227 is provided with a recess at the position where it abuts the first elastic drive rod 3233, so that the first elastic drive rod 3233 at least partially falls in the recess, thereby restricting the first elastic drive member from moving along the side of the abutment structure 227 toward the side closer to the hair-planting disc 224.

[0112] In the actual assembly process, the rotating connecting part 221 of the bristle implantation head 220 is inserted into the mating hole 2111 through the notch 2112 on the side of the bracket 210 to assemble the brush head assembly 200. At this time, the bracket 210 is located between the bristle implantation disc 224 and the limiting part 222 of the bristle implantation head 220, which can limit and fix the bristle implantation head 220 in the axial direction of the mating hole 2111. At the same time, the bristle implantation head 220 can rotate relative to the bracket 210 in the mating hole 2111 with the axis of rotation of the mating hole 2111 as the axis of rotation. Then, the third torsion spring 323 is directly fitted onto the outer periphery of the second connecting post 130 at the bottom of the mounting cavity 110; next, the push rod 310 is inserted into the receiving cavity 120 from the side of the receiving cavity 120 away from the mounting cavity 110, so that the first connecting part 311 of the push rod 310 is located inside the mounting cavity 110; then, the brush head assembly 200 is installed into the mounting cavity 110 as a whole, and is connected to the mounting cavity 110 by the bracket 210, so that the brush head assembly 200 is fixed in the mounting cavity 110. At this time, the linkage shaft 223 of the bristle head 220 cooperates with the first connecting part 311 of the push rod 310. In this way, the assembly of the electric toothbrush head of this embodiment can be realized.

[0113] In another embodiment of this application, see [link to application]. Figure 17 The bottom of the mounting cavity 110 is provided with a third connecting post 140. The third connecting post 140 is co-centered with the rotating connecting part 221. The third connecting post 140 is provided with a first positioning groove 141. The elastic element 320 is a fourth torsion spring 324. The fourth torsion spring 324 includes an anti-rotation part 3241, a second helical segment 3242 and a second elastic drive rod 3243 connected in sequence. The anti-rotation part 3241 cooperates with the first positioning groove 141. The second helical segment 3242 is sleeved on the outer periphery of the third connecting post 140. The second elastic drive rod 3243 is connected to the limiting part 222 to drive the limiting part 222 to rotate. When the push rod 310 moves toward the side closer to the linkage shaft 223, the first positioning groove 141 drives the second elastic drive rod 3243 to rotate, causing the fourth torsion spring 324 to accumulate elastic potential energy. When the force exerted by the main shaft on the push rod 310 is removed, the fourth torsion spring 324 drives the tufting head 220 to reverse through the second elastic drive rod 3243. This process is repeated, allowing the tufting head 220 to reciprocate around the axis of the rotating connection part 221.

[0114] When the fourth torsion spring 324 is tightened, its radius will decrease to a certain extent, causing the position of the second elastic drive rod 3243 of the fourth torsion spring 324 to change. If the second elastic drive rod 3243 is connected to the fixed position of the limiting part 222, the rotation axis of the tufting head 220 may easily change, thereby generating additional vibration.

[0115] Based on this, please continue to see Figure 17The limiting part 222 is provided with a fourth connecting post 228, which is eccentrically disposed with respect to the rotating connecting part 221. The fourth connecting post 228 is provided with a second positioning groove 2281, which extends axially and radially along the rotating connecting part 221. A second elastic drive rod 3243 is movably disposed within the second positioning groove 2281. Thus, the second elastic drive rod 3243 can move radially along the rotating connecting part 221 within the second positioning groove 2281, preventing a change in the radius of the fourth torsion spring 324 that would alter the rotation axis of the tufting head 220, thereby ensuring the rotational stability of the tufting head 220.

[0116] In the actual assembly process, the rotating connecting part 221 of the bristle implantation head 220 is inserted into the mating hole 2111 through the notch 2112 on the side of the bracket 210 to assemble the brush head assembly 200. At this time, the bracket 210 is located between the bristle implantation disc 224 and the limiting part 222 of the bristle implantation head 220, which can limit and fix the bristle implantation head 220 in the axial direction of the mating hole 2111. At the same time, the bristle implantation head 220 can rotate relative to the bracket 210 in the mating hole 2111 with the axis of rotation of the mating hole 2111 as the axis of rotation. Subsequently, the fourth torsion spring 324 is directly fitted onto the outer periphery of the third connecting post 140 at the bottom of the mounting cavity 110, while the anti-rotation part 3241 is engaged in the first positioning groove 141. Next, the push rod 310 is inserted into the receiving cavity 120 from the side of the receiving cavity 120 away from the mounting cavity 110, so that the first connecting part 311 of the push rod 310 is located in the mounting cavity 110. Then, the entire brush head assembly 200 is installed into the mounting cavity 110, and the bracket 210 is connected to the mounting cavity 110, so that the brush head assembly 200 is fixed in the mounting cavity 110. At this time, the linkage shaft 223 of the bristle head 220 engages with the first connecting part 311 of the push rod 310, and the second elastic drive rod 3243 of the fourth torsion spring 324 engages with the second positioning groove 2281 on the bracket 210. In this way, the assembly of the electric toothbrush head of this embodiment can be realized.

[0117] The second aspect of this application discloses an electric toothbrush, including a handle and an electric toothbrush head, the electric toothbrush head being detachably mounted on the handle.

[0118] Specifically, one end of the handle is connected to the housing 100, and a main shaft is provided inside the handle. The main shaft abuts against the end of the push rod 310 away from the tufting head 220. The main shaft is used to push the push rod 310 to move along its own axis toward the side closer to the linkage shaft 223.

[0119] In one embodiment, the electric toothbrush includes a drive unit installed inside the handle. The output end of the drive unit is connected to the main shaft and is used to drive the main shaft to perform linear motion, that is, to drive the main shaft to move along its own axial direction. One end of the main shaft abuts against the push rod 310, so that the main shaft can push the push rod 310 toward the side closer to the linkage shaft 223, thereby driving the bristle head 220 to rotate.

[0120] In one example, the drive device can specifically be a motor, with the motor's output end connected to one end of the main shaft, and the other end of the main shaft abutting against one end of the push rod 310. The motor is used to drive the main shaft to perform linear motion, thereby pushing the push rod 310 to move along its own axis toward the side closer to the linkage shaft 223.

[0121] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0122] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0123] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0124] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0125] It should be understood that although the steps in the flowcharts of the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the accompanying figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

Claims

1. An electric toothbrush head, characterized in that, include: The housing has a mounting cavity and a receiving cavity, the receiving cavity being in communication with the mounting cavity; A brush head assembly includes a bracket and a bristle-planting head. The bracket is fixedly installed in the mounting cavity and has a mating hole. The bristle-planting head includes a rotating connecting part, a limiting part, and a linkage shaft. The rotating connecting part is rotatably mated with the mating hole. The limiting part is connected to the rotating connecting part. The linkage shaft is installed on the limiting part and is eccentrically disposed with respect to the rotating connecting part. The drive assembly includes a push rod and an elastic element. The push rod is movably disposed within the receiving cavity. One end of the push rod is rotatably connected to the linkage shaft, and the other end of the push rod is used to cooperate with the main shaft. The elastic element is disposed within the mounting cavity and is used to drive the push rod to move away from the linkage shaft.

2. The electric toothbrush head according to claim 1, characterized in that, The tufting head includes a tufting disc, which is connected to the end of the rotating connection portion away from the limiting portion. The bracket has a mating portion, and a mating hole is formed in the mating portion. The mating portion is located between the tufting disc and the limiting portion, and the cross-sectional area of ​​the limiting portion is larger than the cross-sectional area of ​​the mating hole.

3. The electric toothbrush head according to claim 2, characterized in that, The bracket includes an abutment portion disposed on the side of the mating portion near the hair-planting disc, and the abutment portion protrudes from the surface of the mating portion. The cross-sectional area of ​​the abutment portion is smaller than the area of ​​the end face of the mating portion near the hair-planting disc.

4. The electric toothbrush head according to claim 2, characterized in that, Along the radial direction of the mating hole, the distance between the mating part and the hair-planting disc gradually decreases.

5. The electric toothbrush head according to any one of claims 1 to 4, characterized in that, The side of the bracket is provided with a notch, which communicates with the mating hole. The minimum distance of the notch is less than the diameter of the rotating connection part. The notch is used to allow the rotating connection part to pass through and move into the mating hole.

6. The electric toothbrush head according to claim 5, characterized in that, The width of the notch gradually increases in the direction away from the rotating connection.

7. The electric toothbrush head according to claim 1, characterized in that, The bracket includes a first fixing part located on the side of the bracket near the bottom wall of the mounting cavity. The first fixing part has a guide surface and a receiving groove. The receiving groove is disposed between the guide surface and the tufting head, and the receiving groove is recessed towards the side near the rotating connection part with the tail of the guide surface as a reference. The cavity wall of the mounting cavity is provided with a second fixing part corresponding to the position of the receiving groove. The second fixing part is snapped into the receiving groove, and the second fixing part is partially located between two side walls of the receiving groove along the circumferential direction of the rotating connection part.

8. The electric toothbrush head according to claim 7, characterized in that, The cavity wall of the mounting cavity is provided with protruding structures on both sides of each of the first fixing parts, and a limiting groove is defined between two protruding structures. The first fixing part is at least partially located in the limiting groove, and the limiting groove is used to restrict the first fixing part from rotating circumferentially along the rotating connection part.

9. The electric toothbrush head according to claim 1 or 8, characterized in that, The housing is provided with a limiting step at the opening of the mounting cavity, and the limiting step is used to abut against the lower end face of the bracket.

10. The electric toothbrush head according to claim 1, characterized in that, The cavity wall of the mounting cavity is provided with a first positioning part, the push rod is provided with a second positioning part, one end of the elastic member abuts against the first positioning part, the other end of the elastic member is connected to the second positioning part, and the elastic member is located on the extension side of the push rod.

11. The electric toothbrush head according to claim 10, characterized in that, The elastic element is a spring or a sheet.

12. The electric toothbrush head according to claim 1, characterized in that, The elastic element is a first torsion spring, which has a first connecting end, a torsion spring body, and a second connecting end. The first connecting end is connected to one end of the torsion spring body, and the second connecting end is connected to the other end of the torsion spring body. The bracket is provided with a first connecting hole, and the first connecting end is engaged with the first connecting hole. The torsion spring body is sleeved on the outer periphery of the limiting part, and the limiting part is provided with a second positioning hole, and the second connecting end is engaged with the second positioning hole.

13. The electric toothbrush head according to claim 1, characterized in that, The elastic element is a second torsion spring, the bracket is provided with a first connecting post, the limiting part is provided with a positioning post, the second torsion spring has a third connecting end and a fourth connecting end, the third connecting end is sleeved on the outer periphery of the first connecting post, and the fourth connecting end is sleeved on the outer periphery of the positioning post.

14. The electric toothbrush head according to claim 13, characterized in that, The second torsion spring includes a first torsion portion and a second torsion portion. One end of the first torsion portion is connected to the third connecting end, and the other end of the first torsion portion is connected to one end of the second torsion portion. The first torsion portion extends radially along the rotating connecting portion to the rotation axis of the rotating connecting portion. A receiving hole is provided at the center of the limiting portion. The second torsion portion is at least partially located in the receiving hole. The other end of the second torsion portion is connected to the fourth connecting end.

15. The electric toothbrush head according to claim 1, characterized in that, The bottom of the mounting cavity is provided with a second connecting post, and the elastic element is a third torsion spring. The third torsion spring includes a fixed abutment section, a first spiral section and a first elastic drive rod connected in sequence. The fixed abutment section abuts against the cavity wall of the mounting cavity. The first spiral section is sleeved on the outer periphery of the second connecting post. The tufting head is provided with an abutment structure, and the first elastic drive rod abuts against the side of the abutment structure.

16. The electric toothbrush head according to claim 1, characterized in that, A third connecting post is provided at the bottom of the mounting cavity. The third connecting post is concentric with the rotating connecting part. The third connecting post is provided with a first positioning groove. The elastic element is a fourth torsion spring. The fourth torsion spring includes an anti-rotation part, a second helical segment, and a second elastic driving rod connected in sequence. The anti-rotation part cooperates with the first positioning groove. The second helical segment is sleeved on the outer periphery of the third connecting post. The second elastic driving rod is connected to the limiting part to drive the limiting part to rotate.

17. The electric toothbrush head according to claim 16, characterized in that, The limiting part is provided with a fourth connecting post, which is eccentrically disposed with the rotating connecting part. The fourth connecting post is provided with a second positioning groove, which extends axially along the rotating connecting part and radially along the rotating connecting part. The second elastic drive rod is movably disposed in the second positioning groove.

18. An electric toothbrush, characterized in that, The toothbrush includes a handle and an electric toothbrush head as described in any one of claims 1 to 17. The handle is connected to the housing. A main shaft is provided inside the handle. The main shaft abuts against the end of the push rod away from the bristle head. The main shaft is used to drive the push rod to move axially toward the linkage shaft.

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