Electric toothbrush head

Abstract

An electric toothbrush head, the electric toothbrush head comprising: a housing, the housing having a mounting cavity and a mounting hole communicating with the mounting cavity; a cleaning head, wherein the cleaning head is rotatably mounted in the mounting cavity through the mounting hole.

Description

TECHNICAL FIELD

[0001] The present invention relates to the technical field of household goods, in particular an electric toothbrush head. STATE OF THE ART

[0002] An electric toothbrush head is a cleaning accessory attached to an electric toothbrush that cleans teeth by rapidly rotating the brush head back and forth. Specifically, the electric toothbrush uses a drive mechanism to drive the drive component, thereby causing the cleaning head of the electric toothbrush head to rotate at high speed, thus achieving an effective cleaning effect.

[0003] In the prior art, the transmission between the drive mechanism and the electric toothbrush head is typically carried out directly via a movable connecting rod for power transmission. However, this design results in unstable support and guidance of the drive component, causing the electric toothbrush head to wobble unevenly during movement and the transmission force to be inconsistently transmitted to the cleaning head of the electric toothbrush head. This leads to unstable movement of the electric toothbrush head. CONTENT OF THE PRESENT INVENTION

[0004] The main purpose of the present invention is to provide an electric toothbrush head aiming at developing a stable support and guide structure to solve the problem of irregular wobbling of the driving component during power transmission, thus improving the movement stability of the electric toothbrush head.

[0005] To achieve the above purpose, the present invention provides an electric toothbrush head, the electric toothbrush head comprising: a housing, the housing having a mounting cavity and a mounting hole communicating with the mounting cavity; a driving component, the driving component being disposed in the mounting cavity, the driving component comprising a first driving rod, a second driving rod, and a third driving rod, the first driving rod, the second driving rod, and the third driving rod being rotatably connected at one end by a rotary shaft, and the other end of the third driving rod being pivotally pivoted in the mounting cavity;a cleaning head, wherein the cleaning head is rotatably mounted in the mounting cavity through the mounting hole, a first rotational groove is arranged eccentrically at the lower end of the cleaning head, and an end of the second drive rod facing away from the first drive rod is arranged in the first rotational groove;

[0006] The advantageous effect of the present invention is that the reciprocating movement of the first drive rod along the longitudinal direction of the housing causes the second drive rod and the third drive rod to move synchronously, and at the same time, the second drive rod rotates under the action of the rotation axis, causing the cleaning head to perform circular reciprocating rotation. Moreover, since one end of the third drive rod is constrained to the housing, when the third drive rod connects to one end of the rotary shaft and moves with the first drive rod, its other end exerts a tensile force on the second drive rod to ensure that the second drive rod remains evenly loaded during movement. This effectively prevents an irregular swing arc and irregular frequency of the cleaning head, thus improving the stability of the movement of the electric toothbrush head. SHORT DESCRIPTION OF THE DRAWING

[0007] To more clearly illustrate the embodiments of the present invention or the technical solution of the prior art, the necessary drawings for describing the embodiments or the prior art are briefly presented below. It goes without saying that the drawings described below represent only some embodiments of the present invention. Those skilled in the art can derive additional drawings based on the structures illustrated in these drawings without inventive activity. Fig. 1 shows a schematic representation of the overall structure of an electric toothbrush head in the mounted state on an electric toothbrush according to an embodiment of the present invention; Fig. 2 shows a schematic diagram of the disassembled structure between the electric toothbrush head and the electric toothbrush according to an embodiment of the present invention; Fig. 3 shows an enlarged structural partial view of A from Fig. 2; Fig. 4 shows a partial sectional view of the electric toothbrush according to an embodiment of the present invention; Fig. 5 shows a schematic representation of the disassembled structure of a drive component according to an embodiment of the present invention; Fig. 6 shows a schematic representation of the overall structure of a cleaning head according to an embodiment of the present invention; Fig. 7 is a schematic diagram showing another disassembled structure of the electric toothbrush according to an embodiment of the present invention; Fig. Figure 8 shows an enlarged partial structural view of B from Fig. 7; Fig. 9 shows a schematic representation of the disassembled structure of a drive component according to another embodiment of the present invention; Fig. 10 shows a schematic structural sectional view of the electric toothbrush head according to an embodiment of the present invention Fig. 11 shows an enlarged structural partial view of C from Fig. 10; Fig. 12 shows an enlarged structural partial view of D from Fig. 10; Fig. 13 shows a schematic structural sectional view of the electric toothbrush head in another perspective according to an embodiment of the present invention; Fig. 14 shows an enlarged structural partial view of E from Fig. 13. DETAILED DESCRIPTION

[0008] With reference to the Fig. 1 to 14, the present invention provides an electric toothbrush head 100, the electric toothbrush head 100 comprising: a housing 1, the housing 1 having a mounting cavity 11 and a mounting hole 12 communicating with the mounting cavity 11; a driving component 2, the driving component 2 being arranged in the mounting cavity 11, the driving component 2 comprising a first driving rod 21, a second driving rod 22, and a third driving rod 23, the first driving rod 21, the second driving rod 22, and the third driving rod 23 being rotatably connected at one end by a rotating shaft 24, and the other end of the third driving rod 23 being pivotally mounted in the mounting cavity 11;a cleaning head 3, wherein the cleaning head 3 is rotatably mounted in the mounting cavity 11 through the mounting hole 12, a first rotational groove 331 is arranged eccentrically at the lower end of the cleaning head 3, and an end of the second drive rod 22 facing away from the first drive rod 21 is arranged in the first rotational groove 331;

[0009] In particular, the electric toothbrush head 100 is mounted on the electric toothbrush. The electric toothbrush includes at least one drive mechanism 200 that sets the first drive rod 21 of the toothbrush head 100 in a reciprocating up and down motion. Furthermore, the electric toothbrush includes a handle 300 that accommodates the drive mechanism 200 and serves to mount the toothbrush head 100. As another example, the drive mechanism 200 can also be directly implemented in the form of an electric motor and a push / pull rod to drive a linear movement of the push / pull rod via the electric motor, thereby setting the drive component 2 in the electric toothbrush head 100 in a reciprocating up and down motion.

[0010] The mounting cavity 11 extends along the longitudinal direction of the housing 1, and the mounting hole 12 has a through-hole structure. The mounting hole 12 is open at the upper end of the housing 1 and communicates with the mounting cavity 11, and the mounting hole 12 is designed for mounting the cleaning head 3.

[0011] Furthermore, the drive component 2 transmits the power from the drive mechanism 200 of the electric toothbrush to the cleaning head 3 to cause the cleaning head 3 to rotate. One end of the first drive rod 21 is connected to the drive mechanism 200 of the electric toothbrush, so that the drive mechanism 200 drives the first drive rod 21 in a reciprocating movement along the longitudinal direction of the mounting cavity 11. The second drive rod 22 and the third drive rod 23 are rotatably connected to the end of the first drive rod 21 facing away from the drive mechanism 200 via the rotary shaft 24. The rotary shaft 24 includes, but is not limited to, screws, pins, rivets, and other structures. A shaft hole is open in each of the first drive rod 21, the second drive rod 22, and the third drive rod 23 for the passage of the rotary shaft 24.If the first drive rod 21, the second drive rod 22, and the third drive rod 23 are articulated together, the shaft hole positions on the individual drive rods are arranged coaxially. By sequentially passing the rotating shaft 24 through the shaft hole positions of the individual drive rods, the first drive rod 21, the second drive rod 22, and the third drive rod 23 are movably connected to one another, so that the first drive rod 21, the second drive rod 22, and the third drive rod 23 can all rotate around the rotating shaft 24.

[0012] Furthermore, the cleaning head 3 is designed as a block-like structure with brush bristles 32, and the cleaning head 3 is connected to the second drive rod 22, so that the cleaning head is driven to rotate when the second drive rod 22 moves eccentrically. The second drive rod 22 and the third drive rod 23 are rotatably connected to the end of the first drive rod 21 facing away from the drive mechanism 200 via a rotating shaft 24, so that during the up and down movement of the first drive rod 21, the second drive rod 22 moves up and down synchronously with it and rotates about the rotating shaft 24, thereby causing the cleaning head 3 connected to the other end of the second drive rod 22 to rotate. At the same time, one end of the third drive rod 23 rotates about the rotating shaft 22.Since the end of the third drive rod 23 facing away from the rotating shaft 22 is hinged to the inner wall of the mounting cavity 11, the third drive rod 23 continues to be restricted to the inner wall of the mounting cavity 11 when pivoting under the force exerted by the first drive rod 21. The third drive rod 23 exerts a tensile force on the second drive rod 22 to ensure that the second drive rod 22 remains evenly loaded during movement. This prevents the second drive rod 22 from significantly deviating from the path during the high-speed movement of the drive component 2, which would lead to uneven force transmission to the cleaning head 3 and thus impair the cleaning performance and user experience.

[0013] In this embodiment, a mounting seat 33 is formed protruding on the side of the cleaning head 3 facing away from the brush bristles 32. The mounting seat 33 is inserted into the mounting cavity 11 and connected to the second drive rod 22 of the drive component 2. During the reciprocating movement of the first drive rod 21 along the longitudinal direction of the inner cavity, the second drive rod 22 and the third drive rod 23 move synchronously. At the same time, the second drive rod 22 is pivoted to both sides under the action of the rotating shaft 24 in order to rotate the cleaning head 3 on the other side of the second drive rod 22.Furthermore, since one end of the third drive rod 23 is restricted within the mounting cavity 11, its other end exerts a tensile force on the second drive rod 22 when the third drive rod connects to one end of the rotating shaft 24 and moves with the first drive rod, ensuring that the second drive rod 22 remains evenly loaded during movement. This prevents the second drive rod 22 from significantly deviating from the path during the high-speed movement of the drive component 2, which would result in uneven force transmission to the cleaning head 3.

[0014] In one embodiment, a first limit post 4 is provided in the mounting cavity 11, wherein the third drive rod is provided at the end with a first fastening hole 231 that is rotatably mounted to the first limit post 4. Here, the housing 1 and the first limit post 4 can be designed as a one-piece molded structure; alternatively, a mounting position for fixing the first limit post 4 can be provided in the mounting cavity 11.At the same time, a first fastening hole 231 is provided at the end of the third drive rod 23. The fastening hole 231 is designed as a through hole, and the third drive rod 23 and the first limit post 4 are rotatably connected to each other by a shaft-hole coupling, and the first limit post 4 is designed to limit the position of the third drive rod 23 at a specific location to establish a connecting structure between the third drive rod 23 and the housing 1. By using the first limit post 4 to enable the articulated connection of the third drive rod 23, the torsional rigidity of the structure is simultaneously increased, so that the drive rod moves stably during rotation and can withstand the force during the movement of the drive component 2.

[0015] In one embodiment, a second limit post 5 is provided at one end of the second drive rod 22, wherein the limit post 5 is arranged in the first rotational groove 331. In this case, the second limit post 5 can be fixedly connected to the second drive rod 22, wherein an end of the second limit post 5 facing away from the second drive rod 22 is rotatably arranged in the first rotational groove 331. The second limit post 5 serves as a connecting structure between the second drive rod 22 and the cleaning head 3 and transmits the force of the second drive rod moving up and down and pivoting to both sides to the cleaning head 3, so that the cleaning head 3 rotates.

[0016] In one embodiment, the inner wall of the mounting cavity 11 is further provided with a third limit post 6, wherein the cleaning head 3 is provided at its lower end with a second pivot groove 332 that is pivotally connected to the third limit post 6, and the second pivot groove 332 is located at the center of rotation of the cleaning head 3. By arranging the third limit post 6 between the cleaning head 3 and the mounting cavity 11 as a structure for implementing a pivot connection, the range of movement of the cleaning head 3 is further limited, and the movement path of the cleaning head 3 is adapted to an arcuate movement around the third limit post 6. Since the cleaning head 3 is restricted by the third limit post 6 in the mounting cavity 11, the cleaning head 3 does not deviate from its movement path when the second drive rod 22 moves to drive the movement of the cleaning head 3.This further improves the smoothness of rotation of the cleaning head 3. Furthermore, since the third limit post 6 is located at the center of rotation, when the second drive rod 22 pivots, the path of movement of the second drive rod is blocked by the third limit post 6. This limits the second drive rod 22 to causing the cleaning head 3 to rotate back and forth by only approximately 30°, thereby improving the smoothness of rotation of the cleaning head 3.

[0017] In one embodiment, the first drive rod 21 has, with reference to the Fig. 4 to 8, a moving section 211, wherein the moving section 211 is opened with a moving groove 212, the second drive rod 22 is inserted into the moving groove 212, and the third drive rod 23 is arranged on the outside of the moving section 211. The design of the moving groove 212 improves the stability of the second drive rod 22 and restricts the second drive rod 22 in the moving groove 212 to prevent wobbling of the second drive rod perpendicular to the movement path during movement, which would impair the smoothness of the overall movement. At the same time, the second drive rod 22 and the third drive rod 23 are arranged on the inside and outside of the moving section 211 to avoid structural interference between the two drive rods during movement.

[0018] In one embodiment, with reference to the Fig. 4 to 10 first shaft holes 218 are formed on opposite sides of the moving section 211, a second shaft hole 221 is formed at an end of the second drive rod 22 facing away from the second limit post 5, a third shaft hole 232 is formed at an end of the third drive rod 23 facing away from the first limit post 4, wherein the rotary shaft 24 passes through the first shaft holes 218, the second shaft hole 221 and the third shaft hole 232, respectively.

[0019] In one embodiment, the first drive rod 21 comprises, with reference to the Fig. 4 to 8, a first push rod 213 and a second push rod 214 are fixedly connected to the first push rod 213. An end of the second push rod 214 remote from the first push rod 213 is rotatably connected to the second drive rod 22 and the third drive rod 23, and the angle between the first push rod 213 and the second push rod 214 is an obtuse angle. The first push rod 213 and the second push rod 214 may be formed as an integrally molded structure to ensure that the first push rod 213 and the second push rod 214 work in a coordinated manner during the movement of the first drive rod 21, and an end of the second push rod 214 remote from the first push rod 213 extends to form the moving portion 211 connected to the second drive rod 22 and the third drive rod 23 to enable power transmission and rotation.The obtuse angle between the first push rod 213 and the second push rod 214 helps to adjust the angle and output magnitude of the force transmitted from the first drive rod 21 to the second drive rod 22.

[0020] In one embodiment, with reference to the Fig. 4 to 8 the angle between the second push rod 214 and the third drive rod 23 is greater than the angle between the second drive rod 22 and the third drive rod 23.

[0021] In a further embodiment, the angle between the second push rod 214 and the third drive rod 23 is smaller than the angle between the second drive rod 22 and the third drive rod 23.

[0022] In one embodiment, the cleaning head 3 comprises a rotating base 31 and brush bristles 32 arranged on the rotating base 31, wherein the rotating base 31 is rotatably mounted in the mounting cavity 11 and the brush bristles 32 are arranged on the side of the rotating base 31 facing away from the mounting cavity 11. The rotating base 31 is provided with a mounting seat 33 at the top, wherein the mounting seat 33 is provided with an eccentrically opened escape groove 333, and the first rotating groove 331 is provided on the inner wall of the escape groove 333. The mounting seat 33 protrudes from the side of the rotary base 31 facing away from the brush bristles 32, and a radius of the mounting seat 33 is smaller than a radius of the rotary base 31. The eccentrically opened escape groove 333 is intended to keep sufficient space on the rotation path of the rotary base 31 to avoid structural interference between the rotary base 31 and the second drive rod 22 during movement.

[0023] In one embodiment, the electric toothbrush head 100 further includes a limit pin 7, the housing 1 is opened with a second mounting hole 15, the side wall of the mounting seat 33 is opened with a limit slot 334, and the limit pin 7 is inserted from the second mounting hole 15 into the limit slot 334. Specifically, the limit slot 334 is an arcuate groove opened along the movement path of the cleaning head 3, and the limit pin 7 is arranged perpendicular to the third limit post 6. At this time, the inner wall of the limit slot 334 is restricted by the limit pin 7 to prevent the limit slot from wobbling in a direction perpendicular to the rotation path. This improves the mounting stability of the cleaning head 3 and thus improves the smoothness of the rotation of the cleaning head 3.

[0024] In one embodiment, the electric toothbrush head 100 further comprises a shock-absorbing pad 111, wherein the shock-absorbing pad 111 is arranged in the mounting cavity 11, and the shock-absorbing pad 111 presses with its upper side against the outer wall of the second drive rod 22.

[0025] The shock-absorbing pad 111 is a flexible material including, but not limited to, rubber and silicone. It fills the space between the second drive rod 22 and the mounting cavity 11 without unduly interfering with the movement of the second drive rod 22. It thus performs a certain shock-absorbing function.

[0026] Furthermore, a receiving groove 113 for receiving the shock-absorbing pad 111 is provided on the inner wall of the mounting cavity 11. The shape and size of the receiving groove 113 are adapted to the shock-absorbing pad 111. This ensures that the shock-absorbing pad 111 can be stably and firmly placed at the lower end of the mounting cavity 11 without shifting or falling off during use. This increases the stability of the cleaning head 3.

[0027] In one embodiment, a metal sleeve 51 surrounds the second limit post 5. The metal sleeve 51 is movably mounted on the second limit post 5. The interaction of the metal sleeve 51 with the first rotational groove 331 improves the power transmission efficiency between the second drive rod and the cleaning head 3, allowing the second drive rod to rotate more smoothly in the first rotational groove 331.

[0028] In one embodiment, a connecting piece 8 is further provided on the first drive rod 21, wherein the end of the first drive rod 21 facing away from the second drive rod 22 is provided with a connecting seat 215, wherein the connecting seat 215 is designed for mounting the connecting piece 8.

[0029] In particular, the connecting piece 8 is designed to connect to the drive end of the drive mechanism 200, whereby the power of the drive mechanism 200 is transmitted along the axis of the electric toothbrush head 100 to the drive component 2. If the drive mechanism 200 is driven by an electric motor, the connecting piece 8 is subjected to a thrust force by the drive mechanism 200. It transmits the thrust force to the drive component 2, which then performs an up and down movement. The action of the drive component 2 causes the cleaning head 3 to rotate, thereby achieving the cleaning effect.

[0030] Furthermore, the connecting piece 8 and the connecting seat 215 can be connected to each other via a protrusion 219 in combination with a groove 83, a locking lug in combination with the groove 83, or in a similar manner. As a preferred embodiment, the connecting seat 215 is provided with a protrusion 219, wherein the protrusion 219 is provided with an annular locking lug, while the connecting piece 8 is provided with a groove 83 matching the protrusion 219. Due to the flexibility of the connecting piece 8, the protrusion 219 is pressed into the groove 83, and the locking lug mates with the limiting structure on the circumference of the groove 83 to establish a locking connection.

[0031] Furthermore, the connecting piece 8 is made of a flexible material with excellent elasticity and deformability. When the connecting piece 8 is subjected to shocks or vibrations from the drive mechanism 200, the material of the connecting piece deforms elastically, absorbing and dissipating the energy of the vibrations or shocks, and thus reducing the vibrations transmitted to the connecting piece 8 and the connected drive component 2, thereby improving the smoothness of the cleaning head 3 when moving.

[0032] In one embodiment, with reference to the Fig. 2 to 8, a spring 216 surrounds the outside of the first drive rod 21. A spring seat 112 is also provided in the mounting cavity 11. The spring 216 is located between the spring seat 112 and the connecting seat 215. When the connecting piece 8 is subjected to a thrust force by the drive mechanism 200, the first drive rod 21 moves linearly toward the cleaning head 3. In doing so, the spring 216 is compressed toward the spring seat 112. As soon as the drive mechanism 200 stops supplying force, the spring 216 releases the pressure, restores itself, and drives the first drive rod 21 to move linearly away from the cleaning head 3.

[0033] In one embodiment, with reference to the Fig. 2 to 8, the connecting piece 8 comprises a soft rubber suction pad 82, and the end of the soft rubber suction pad 82 is provided with a suction pad portion that connects to the end of the drive component. The material of the soft rubber suction pad 82 includes, but is not limited to, flexible materials such as rubber or silicone, whose surface has adhesive properties, allowing it to firmly adhere to smooth surfaces. By attaching a connecting handle 300 to the drive end of the drive mechanism 200, the soft rubber suction pad 82 applies pressure to the lower end of the connecting piece 8, creating a negative pressure between the connecting piece and the surface, enabling stable attachment. In addition, since the soft rubber suction pad 82 is a flexible material, it has good wear resistance and durability in power transmission. This allows it to maintain stable performance during long-term use.

[0034] In one embodiment, with reference to the Fig. 2 to 8, the connecting piece 8 comprises a soft rubber spherical washer 81, and the end of the soft rubber spherical washer 81 is provided with an elliptical section that connects to the end of the drive component. The soft rubber spherical washer 81 has a hemispherical structure and allows for flexible connection in multiple directions. It is used for connection to the drive end of the drive mechanism 200, which has irregular or curved surfaces, and is characterized by high adaptability and stability. Furthermore, the elastic force of the spring 216 counteracts the first drive rod 21 to ensure that the connecting piece 8 remains tightly connected to the drive end of the drive mechanism 200, thereby avoiding an unstable connection between the first drive rod 21 and the drive mechanism 200, which would impair the efficiency and uniformity of the power transmission.This would result in unstable rotation of the electric toothbrush head 100.

[0035] In one embodiment, the drive component 2 further comprises a magnetic element 9, wherein the magnetic element 9 is attached to the end of the first drive rod 21 facing away from the second drive rod 22, and the magnetic element 9 is magnetically attracted to the drive shaft of the electric toothbrush. The magnetic element 9 is configured to generate a magnetic attraction effect with the drive end of the drive mechanism 200 and to drive the drive component 2 by magnetic force. This enables a linear reciprocating movement.

[0036] In one embodiment, the magnetic element 9 is a screw, and the first drive rod 21 is provided with a screw hole 217 that matches the screw. Here, the screw hole 217 is provided with an internal thread that matches the screw, and the magnetic element 9 is designed in the form of a screw to ensure stable installation of the magnetic element 9. Since the screw is a common fastening element, it is easier to install and replace, which improves installation efficiency.

[0037] In one embodiment, an end cover 13 is provided at the end opposite the housing 1, and a flexible snap fastener 14 is provided on the outside of the housing 1, wherein a snap-in groove matching the snap fastener 14 is provided on the end cover 13 in order to establish a snap-in connection.

[0038] In particular, the end cover 13 is designed as a direct connection component between the housing 1 and the handle 300. The end cover 13 is provided with a structure that is connected to the housing 1 and the handle 300, respectively. The housing 1 of the electric toothbrush head 100 is mounted to the electric toothbrush by detachably mounting the end cover 13 at the lower end of the housing 1 and the direct connection structure between the end cover 13 and the handle 300.

[0039] Furthermore, the end cover 13 is provided with a plug-in portion whose diameter is smaller than that of the mounting cavity 11. The plug-in portion is inserted into the mounting cavity 11 to enable the connection of the end cover 13 to the housing 1. Furthermore, an open locking groove is provided in the end cover 13. The design of the locking fastener 14 and the locking groove 131 enables the flexible design of the housing 1. Since the locking fastener 14 can be bent, the locking fastener 14 is pushed upward when inserted through the inner wall of the end cover 13 until the locking fastener 14 enters the locking groove 131. At this time, the end cover 13 and the housing 1 are firmly connected to each other by the locking between the locking fastener 14 and the locking groove 131. When the end cover 13 is to be removed, the end cover 13 can be easily removed by pressing the locking fastener 14 and pulling it out.This makes removal and installation easier.

[0040] Furthermore, matching connecting structures are provided between the end cover 13 and the handle 300 at the lower end of the electric toothbrush. With reference to Fig. 11, for example, the end cover 13 is open with a round locking opening 132, while a round locking projection 301 protrudes on the handle 300.

[0041] The foregoing merely represents optional embodiments of the present invention and therefore does not limit the scope of the present invention. All equivalent structural changes made in consideration of the inventive idea of ​​the present invention based on the description and the accompanying drawings of the present invention, as well as all direct or indirect applications in other related technical fields, are within the scope of the present invention.

Claims

[1] Electric toothbrush head, the electric toothbrush head comprising: a housing, the housing having a mounting cavity and a mounting hole communicating with the mounting cavity; a cleaning head, wherein the cleaning head is rotatably mounted in the mounting cavity through the mounting hole. [2] The electric toothbrush head according to claim 1, further comprising: a driving component, wherein the driving component is arranged in the mounting cavity, and the driving component comprises a first driving rod, a second driving rod, and a third driving rod, wherein the first driving rod, the second driving rod, and the third driving rod are rotatably connected at one end by a rotating shaft, and the other end of the third driving rod is pivotally mounted in the mounting cavity; a first rotating groove is arranged eccentrically at the lower end of the cleaning head, and an end of the second driving rod facing away from the first driving rod is arranged in the first rotating groove. [3] The electric toothbrush head according to claim 2, wherein the inner wall of the mounting cavity is provided with a first limit post, and the end of the third drive rod is opened with a first fastening hole matching the first limit post; the second drive rod is provided with a second limit post, and the second limit post is located in the first rotational groove; the inner wall of the mounting cavity is further provided with a third limit post, and the lower end of the cleaning head is opened with a second rotational groove rotatably connected to the third limit post, and the second rotational groove is located at the rotational center of the cleaning head; the first drive rod has a moving portion, the moving portion being opened with a moving groove, the second drive rod is inserted into the moving groove, and the third drive rod is arranged outside the moving portion;first shaft holes are formed on opposite sides of the moving section, a second shaft hole is formed at an end of the second drive rod facing away from the second limit post, a third shaft hole is formed at an end of the third drive rod facing away from the first limit post, wherein the rotary shaft passes through each of the first shaft holes, the second shaft hole, and the third shaft hole; [4] The electric toothbrush head according to claim 2, wherein the first drive rod comprises a first push rod and a second push rod fixedly connected to the first push rod, and an end of the second push rod remote from the first push rod is rotatably connected to the second push rod and the third drive rod, and the angle between the first push rod and the second push rod is an obtuse angle; the angle between the second push rod and the third drive rod is greater than the angle between the second drive rod and the third drive rod; alternatively, the angle between the second push rod and the third drive rod is smaller than the angle between the second drive rod and the third drive rod. [5] An electric toothbrush head according to claim 2, wherein the cleaning head comprises a rotary base and brush bristles arranged on the rotary base, the rotary base being rotatably mounted in the mounting cavity and the brush bristles being arranged on the side of the rotary base facing away from the mounting cavity, the rotary base being protrudingly provided with a mounting seat, the mounting seat being provided with an eccentrically opened escape groove, and the first rotary groove being provided on the inner wall of the escape groove. [6] The electric toothbrush head according to claim 5, wherein the electric toothbrush head further comprises a limit pin, the housing is opened with a second mounting hole, the side wall of the mounting seat is opened with a limit slot, and the limit pin is inserted from the second mounting hole into the limit slot. [7] The electric toothbrush head according to claim 2, wherein the electric toothbrush head further comprises a shock-absorbing pad, the shock-absorbing pad being disposed in the mounting cavity, and the shock-absorbing pad pressing with its upper surface against the outer wall of the second drive rod. [8] An electric toothbrush head according to claim 4, wherein a metal sleeve encloses the second limit post. [9] Electric toothbrush head according to claim 2, wherein the first drive rod is provided with a connecting piece matching the drive shaft of the electric toothbrush, the end of the first drive rod facing away from the second drive rod is provided with a connecting seat, the connecting seat is designed for mounting the connecting piece; a spring encloses the outside of the first drive rod, a spring seat is also provided in the mounting cavity, the spring is located between the spring seat and the connecting seat; the connecting piece comprises a soft rubber suction disc; the connecting piece comprises a soft rubber spherical disc. [10] The electric toothbrush head according to claim 2, wherein the driving component further comprises a magnetic element that magnetically matches the drive shaft of the electric toothbrush, the magnetic element being attached to the end of the first drive rod facing away from the second drive rod; the magnetic element is a screw, and the first drive rod is opened with a screw hole matching the screw; the electric toothbrush head further comprises an end cover, the end cover being detachably connected to the housing.

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