Brush head assembly detachably connected with handle end of electric toothbrush

Abstract

The utility model discloses a brush head assembly detachably connected with a handle end of an electric toothbrush, and relates to the technical field of daily necessities. Comprising a brush rod, a brush head base is integrally arranged at the front end of the brush rod and provided with a circular opening located in the side portion, a brush head is arranged at the circular opening end of the brush head base in a matched mode, and a driven gear is rotationally installed in the circular opening; a driving gear in transmission connection with the driven gear is installed in the brush rod, a plug connector and a first positioning sleeve are arranged in a port of the end, away from the brush head base, of the brush rod, the driving gear is in transmission connection with the plug connector through a transmission connection assembly, and the first positioning sleeve is located on the outer side of the plug connector and connected with the brush rod. According to the toothbrush, the brush handle is divided into the brush rod and the handle, transmission parts are all integrated in the brush rod, after the transmission parts in the brush rod or the surface of the brush head is abraded, the brush rod can be integrally replaced, the whole toothbrush does not need to be replaced, and cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of daily necessities, in particular to a brush head assembly which is detachably connected to a handle end of an electric toothbrush. Background Art

[0002] In the prior art, for example, a detachable 360-degree rotating electric toothbrush disclosed in CN215425249U generally adopts an integral brush handle. After the electric toothbrush is used for a period of time, transmission parts such as gears and connecting shafts will be worn. After wear, due to the reduction of meshing accuracy, abnormal noise is easily generated during use. In addition, the brush head of the toothbrush rubs against the teeth in the mouth for a long time, and the surface is poorly aesthetically pleasing after wear. If a new electric toothbrush is replaced, the cost is high and it also causes a waste of resources. Utility Model Content

[0003] The utility model aims to provide a brush head assembly which is detachably connected to the handle end of an electric toothbrush, and can effectively solve the problems in the background technology.

[0004] The technical solution to achieve the above object is: a brush head assembly detachably connected to the handle end of an electric toothbrush, comprising a brush rod with a hollow cavity, a brush head seat integrally provided at the front end of the brush rod, a circular opening located at the side and connected to the brush rod, a brush head is provided at the circular opening end of the brush head seat, and a driven gear for driving the brush head to rotate is rotatably installed in the circular opening;

[0005] The invention is characterized in that: a gear cover encapsulating the driven gear is provided in the circular opening outside the driven gear, the gear cover is provided with a center hole, the driven gear is detachably connected to the brush head, and the connection end is located in the center hole of the gear cover;

[0006] A driving gear connected to a driven gear is installed in the brush rod. The end of the brush rod away from the brush head seat is open and is used for detachable connection with the handle end of the electric toothbrush. A connector and a first positioning sleeve are arranged in the port at the end of the brush rod away from the brush head seat. The driving gear is connected to the connector through a transmission connection assembly. The first positioning sleeve is located on the outside of the connector and is connected to the brush rod. The first positioning sleeve is used to position the connector, the transmission connection assembly and the driving gear inwardly in the brush rod.

[0007] Furthermore, an arc-shaped groove and an arc-shaped convex strip are provided between the brush head seat and the gear cover, and the arc-shaped groove and the arc-shaped convex strip are arranged along the circumferential direction, and the cross-section of the arc-shaped groove and the arc-shaped convex strip is also arc-shaped;

[0008] The brush head seat and the gear cover are guided and matched by the first guide groove and the first guide protrusion.

[0009] Furthermore, the gear cover and the brush head seat are welded by ultrasonic welding.

[0010] Furthermore, the transmission connection assembly includes a transmission shaft having one end connected to the driving gear in a plug-in / pull-out manner and the other end connected to the connector in a plug-in / pull-out manner.

[0011] Furthermore, one end of the connector is a D-shaped socket and the other end is a five-pointed star socket, the D-shaped socket is plug-in connected to the transmission shaft, and the five-pointed star socket is used to plug-in connect to the output end of the drive motor of the electric toothbrush.

[0012] Furthermore, the transmission shaft is sleeved with a sealing ring that seals with the brush rod, a shaft sleeve that supports the brush rod, and a second positioning sleeve that is limited and arranged on the side of the shaft sleeve away from the driving gear and has an interference fit with the transmission shaft.

[0013] Furthermore, cantilevers formed by arc-shaped hollowing are symmetrically arranged on both sides of the first positioning sleeve, a hemispherical protrusion is arranged on the cantilever, and a positioning hole cooperating with the hemispherical positioning is arranged on the brush rod; a guide groove is arranged in the port at one end of the brush rod away from the brush head seat to facilitate the hemispherical protrusion to be introduced into the positioning hole, and the guide groove is not connected with the corresponding positioning hole.

[0014] Furthermore, a threaded connection is adopted between the driven gear and the brush head.

[0015] Furthermore, a sleeve end with a reduced diameter is provided at one end of the brush rod away from the brush head seat, a waterproof sealing ring is provided on the sleeve end, and a positioning step for limiting the waterproof sealing ring is also provided between the sleeve end and the brush rod.

[0016] The beneficial effects of the utility model are as follows: the utility model divides the brush handle into a brush rod and a handle, and integrates the transmission components in the brush rod; after the transmission components in the brush rod or the surface of the brush head are worn, the brush rod can be replaced as a whole without replacing the entire toothbrush, thereby reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of the utility model;

[0018] Figure 2 A three-dimensional diagram of a brush rod;

[0019] Figure 3 It is a schematic diagram of the structure of the gear cover;

[0020] Figure 4 It is a three-dimensional view of the first positioning sleeve. DETAILED DESCRIPTION

[0021] like Figure 1-4As shown, the utility model includes a brush rod 1 with a hollow cavity, a brush head seat 2 is integrally provided at the front end of the brush rod 1, the brush head seat 2 is provided with a circular opening 3 located on the side and connected to the brush rod 1, a brush head 4 is cooperated with the circular opening end of the brush head seat 2, and a driven gear 5 for driving the brush head 4 to rotate is rotatably installed in the circular opening 3.

[0022] A gear cover 6 is also provided in the circular opening 3 outside the driven gear 5 to encapsulate the driven gear 5. The gear cover 6 is provided with a center hole and is ultrasonically welded to the brush head holder 2. The driven gear 5 is threadedly connected to the brush head 4, and the connecting end is located in the center hole of the gear cover 6.

[0023] As a further explanation of the present embodiment, an arc groove 7 is provided on the inner wall of the brush head seat 2, and an arc convex strip 8 engaged with the arc groove 7 is provided on the side wall of the gear cover 6. To facilitate the insertion of the arc convex strip 8, the cross-sections of the arc groove 7 and the arc convex strip 8 are also arranged to be arc-shaped; further, to facilitate the accurate insertion of the arc convex strip 8 into the arc groove 7, a first guide groove 9 extending to the open end is provided on the inner wall of the brush head seat 2, and a first guide protrusion 10 for guiding and cooperating with the first guide groove 9 is provided on the inner wall of the gear cover 6.

[0024] A driving gear 11 is installed in the brush rod 1, which is transmission-connected to the driven gear 5. The end of the brush rod 1 away from the brush head holder 2 is open and is used for detachable connection with the handle end of the electric toothbrush. Specifically, the brush rod 1 and the handle end of the electric toothbrush can be connected by a positioning sleeve or a threaded connection structure (such as the connection method of a pen and a pen cover), but is not limited to it.

[0025] A connector 12 and a first positioning sleeve 13 are provided in the port at one end of the brush rod 1 away from the brush head seat 2. The connector 12 is clearance-matched with the brush rod 1. The driving gear 11 and the connector 12 are transmission-connected via a transmission connection assembly. The transmission connection assembly includes a transmission shaft 14 with one end plug-in-connected to the end of the driving gear 11 and the other end plug-in-connected to the connector 12. Both ends of the transmission shaft 14 are provided with D-shaped plugs. The ends of the driving gear 11 and the connector 12 connected to the transmission shaft 14 are respectively provided with D-shaped sockets. The end of the connector 12 away from the transmission shaft 14 is provided with a five-pointed star socket. The five-pointed star socket is used for plug-in connection with the output end of the driving motor of the electric toothbrush, and the driving motor is installed in the handle end of the electric toothbrush.

[0026] The first positioning sleeve 13 is located outside the connector 12 and connected to the brush rod 1 . The first positioning sleeve 13 is used to position the connector 12 , the transmission connection assembly, and the driving gear 11 inwardly in the brush rod 1 .

[0027] Furthermore, cantilevers 15 formed by arc-shaped hollowing are symmetrically arranged on both sides of the first positioning sleeve 13, and a hemispherical protrusion 16 is arranged on the cantilever 15. The arrangement of the cantilever 15 makes the hemispherical protrusion 16 deform inward when the first positioning sleeve 13 is installed, and a positioning hole 17 cooperating with the hemispherical positioning is arranged on the brush rod 1. In order to facilitate the hemispherical protrusion 16 to be smoothly inserted into the positioning hole 17, a guide groove 18 is arranged in the end port of the brush rod 1 away from the brush head seat 2 to facilitate the hemispherical protrusion 16 to be introduced into the positioning hole 17, and the guide groove 18 is not connected with the corresponding positioning hole 17.

[0028] The transmission shaft 14 is sleeved with a sealing ring 18 that seals with the brush rod 1 , a shaft sleeve 19 that supports and cooperates with the brush rod 1 , and a second positioning sleeve 20 that is limited and arranged on the side of the shaft sleeve 19 away from the driving gear 11 and is interference-fitted with the transmission shaft 14 .

[0029] A sleeve end 21 with a reduced diameter is provided at one end of the brush rod 1 away from the brush head seat 2. A waterproof sealing ring 22 is provided on the sleeve end 21. A positioning step 23 for limiting the waterproof sealing ring 22 is also provided between the sleeve end 21 and the brush rod 1.

Claims

1. A brush head assembly detachably connected to the handle end of an electric toothbrush, comprising a brush rod with a hollow cavity, a brush head seat integrally provided at the front end of the brush rod, a circular opening located at the side of the brush head seat and connected to the brush rod, a brush head being provided at the circular opening end of the brush head seat, and a driven gear for driving the brush head to rotate being rotatably installed in the circular opening; Features: A gear cover encapsulating the driven gear is also provided in the circular opening outside the driven gear, and the gear cover is provided with a center hole. The driven gear is detachably connected to the brush head, and the connection end is located in the center hole of the gear cover; A driving gear connected to a driven gear is installed in the brush rod. The end of the brush rod away from the brush head seat is open and is used for detachable connection with the handle end of the electric toothbrush. A connector and a first positioning sleeve are arranged in the port at the end of the brush rod away from the brush head seat. The driving gear is connected to the connector through a transmission connection assembly. The first positioning sleeve is located on the outside of the connector and is connected to the brush rod. The first positioning sleeve is used to position the connector, the transmission connection assembly and the driving gear inwardly in the brush rod.

2. A brush head assembly detachably connected to the handle end of an electric toothbrush according to claim 1, characterized in that: An arc-shaped groove and an arc-shaped convex strip are provided between the brush head seat and the gear cover, and are arranged along the circumferential direction. The cross-sections of the arc-shaped groove and the arc-shaped convex strip are also arc-shaped. The brush head seat and the gear cover are guided and matched by the first guide groove and the first guide protrusion.

3. A brush head assembly detachably connected to the handle end of an electric toothbrush according to claim 1, characterized in that: The gear cover and the brush head seat are welded by ultrasonic welding.

4. A brush head assembly detachably connected to the handle end of an electric toothbrush according to claim 1, characterized in that: The transmission connection assembly comprises a transmission shaft with one end connected to the driving gear by plugging and unplugging and the other end connected to the plug-in connector by plugging and unplugging.

5. A brush head assembly detachably connected to the handle end of an electric toothbrush according to claim 1, characterized in that: One end of the connector is a D-shaped socket and the other end is a five-pointed star socket. The D-shaped socket is plug-in connected to the transmission shaft, and the five-pointed star socket is used for plug-in connection with the output end of the driving motor of the electric toothbrush.

6. A brush head assembly detachably connected to the handle end of an electric toothbrush according to claim 4, characterized in that: The transmission shaft is sleeved with a sealing ring that seals with the brush rod, a shaft sleeve that supports the brush rod, and a second positioning sleeve that is limited and arranged on the side of the shaft sleeve away from the driving gear and has an interference fit with the transmission shaft.

7. A brush head assembly detachably connected to the handle end of an electric toothbrush according to claim 1, characterized in that: Cantilevers formed by arc-shaped hollowing are symmetrically arranged on both sides of the first positioning sleeve, a hemispherical protrusion is arranged on the cantilever, and a positioning hole matching the hemispherical positioning is arranged on the brush rod; a guide groove is arranged in the end port of the brush rod away from the brush head seat to facilitate the hemispherical protrusion to be introduced into the positioning hole, and the guide groove is not connected with the corresponding positioning hole.

8. A brush head assembly detachably connected to the handle end of an electric toothbrush according to claim 1, characterized in that: The driven gear and the brush head are connected by threads.

9. A brush head assembly detachably connected to the handle end of an electric toothbrush according to claim 1, characterized in that: A sleeve end with a reduced diameter is arranged at one end of the brush rod away from the brush head seat, a waterproof sealing ring is arranged on the sleeve end, and a positioning step for limiting the waterproof sealing ring is also arranged between the sleeve end and the brush rod.

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