CN217525474U

CN217525474U - Electric toothbrush head

Info

Publication number: CN217525474U
Application number: CN202220910764.4U
Authority: CN
Inventors: 周阳
Original assignee: Guangzhou Hee San Jin Design Co ltd
Current assignee: Guangzhou Hee San Jin Design Co ltd
Priority date: 2022-04-19
Filing date: 2022-04-19
Publication date: 2022-10-04
Anticipated expiration: 2032-04-19

Abstract

The utility model discloses an electric toothbrush head, which comprises a brush rod and a brush disc, wherein a cavity is arranged in the middle of the brush rod, brush bristles are arranged on the brush disc, the brush disc is connected to the upper end of the brush rod and can rotate relative to the brush rod, a transmission rod is arranged in the cavity of the brush rod, one end of an L-shaped linkage rod is connected with the brush disc, the other end of the L-shaped linkage rod is connected with the upper part of the transmission rod, and the other end of the L-shaped linkage rod is not coincident with the rotation central axis of the transmission rod; when the electric toothbrush head is arranged on the electric toothbrush driving body, the lower part of the transmission rod is connected with the driving shaft of the electric toothbrush driving body, the transmission rod is driven by the driving shaft to rotate back and forth along the circumferential direction, and the transmission rod drives the brush disc to rotate back and forth through the L-shaped linkage rod. Preferably, the brush rod comprises a head part, a middle supporting part and a clamping part; the transmission rod is pivoted in the middle supporting part, and the axial direction of the transmission rod is limited together by the middle supporting part and the clamping part. The utility model discloses transmission part simple structure, the assembly of being convenient for, transmission reliability are also higher.

Description

Electric toothbrush head

Technical Field

The utility model belongs to the technical field of electric toothbrush makes the technique and specifically relates to an electric toothbrush head.

Background

The electric toothbrush makes the brush head rotate or vibrate at high frequency through the quick rotation or vibration of the motor core, so that the toothpaste is instantaneously decomposed into fine foams to deeply clean slits between teeth, and meanwhile, the vibration of the bristles can promote the blood circulation of the oral cavity and have a massage effect on gum tissues. Electric toothbrushes have begun to be increasingly accepted and used by the general public. The existing electric toothbrush usually comprises an electric toothbrush driving body and an electric toothbrush head, wherein the electric toothbrush head is assembled on the electric toothbrush driving body, and the electric toothbrush head needs to be replaced after bristles of the electric toothbrush head are worn. Fig. 1 is a conventional electric toothbrush driving body, in which a driving shaft 10 rotates back and forth in a circumferential direction, and the driving shaft 10 rotates back and forth in the circumferential direction by providing a structure such as a swing motor on the electric toothbrush driving body 100. The driving shaft 10 may further be provided with a catching groove 101 for facilitating connection with the electric toothbrush head.

In order to enable the electric toothbrush head to be matched with the electric toothbrush driving body and enable the brush disc to swing back and forth together with the bristles, various structures of the electric toothbrush head have been designed. For example, a Chinese utility model patent with patent number ZL201220407088.5 and name of 'electric toothbrush head' is disclosed in 13.02.2013, which comprises a brush rod and a brush disc which is arranged at the top end of the brush rod and is provided with bristles, wherein the brush disc is arranged on the mounting end at the top end of the brush rod by a metal positioning pin and can swing within a swing angle of 20-35 degrees; be equipped with drive disk assembly in the brush-holder stud, drive disk assembly includes the installation pole that plastic materials made, be provided with the transmission shaft in the installation pole, install in the mounting hole of installation pole behind the spring of transmission shaft suit, the top of transmission shaft is provided with the swinger that can make brush dish horizontal hunting, the top of installation pole still is provided with a fixed pin, and the fixed pin can make the installation pole follow the fixed pin and carry out horizontal rotation as the axle center after installing in the brush-holder stud, the afterbody of installation pole is provided with the mounting hole of mountable drive disk assembly, makes drive disk assembly drive brush dish horizontal hunting under drive arrangement's drive. The transmission part of the electric toothbrush head comprises an installation rod, a transmission shaft, a spring, a swing pin and a fixing pin, the structure is complex, the assembly is difficult, and the transmission reliability is to be improved.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide an electric toothbrush head, its drive disk assembly simple structure, the assembly of being convenient for, transmission reliability are also higher.

In order to achieve the above purpose, the technical scheme of the utility model is that: an electric toothbrush head comprises a brush rod and a brush disc, wherein a cavity is formed in the middle of the brush rod, bristles are arranged on the brush disc, the brush disc is connected to the upper end of the brush rod and can rotate relative to the brush rod, a transmission rod is arranged in the cavity of the brush rod, one end of an L-shaped linkage rod is connected with the brush disc, the other end of the L-shaped linkage rod is connected with the upper portion of the transmission rod, and the other end of the L-shaped linkage rod is not coincident with the rotation central axis of the transmission rod; when the electric toothbrush head is arranged on the electric toothbrush driving body, the lower part of the transmission rod is connected with the driving shaft of the electric toothbrush driving body, the transmission rod is driven by the driving shaft to rotate back and forth along the circumferential direction, and the transmission rod drives the brush disc to rotate back and forth through the L-shaped linkage rod.

The upper part of the transmission rod is provided with a first connecting hole, the central axis of the first connecting hole is parallel to but not coincident with the rotating central axis of the transmission rod, the brush disc is provided with a second connecting hole, and the central axis of the second connecting hole is parallel to but not coincident with the rotating central axis of the brush disc; one end of the L-shaped linkage rod is inserted in the second connecting hole, and the other end of the L-shaped linkage rod is inserted in the first connecting hole. This facilitates installation.

Preferably, the brush rod comprises a head part, a middle supporting part and a clamping part, the lower end of the head part is sleeved with the upper end of the middle supporting part, and the clamping part is clamped with the middle supporting part; the transmission rod is pivoted in the middle supporting part, and the axial direction of the transmission rod is limited together by the middle supporting part and the clamping part. The brush rod is convenient to manufacture and install.

As an improvement, be equipped with a plurality of elastic joint convex parts in the head, the free end of joint convex part is equipped with the pothook, and a plurality of joint convex part medial surfaces are on same face of cylinder, the brush dish is kept away from a pin joint axle that outwards extends on brush hair one side, and pin joint axle middle part is equipped with annular positioning groove, pin joint off-axial face cooperatees with a plurality of joint convex part medial surfaces, and the pothook cooperation on every joint convex part is in on the annular positioning groove.

Furthermore, a connecting concave hole is formed in the lower end of the transmission rod, a clamping protrusion is arranged on the inner side face of the connecting concave hole, a convex portion sleeved with the connecting concave hole is arranged on the clamping portion, a through hole corresponding to the connecting concave hole is further formed in the clamping portion, a clamping groove is formed in the outer peripheral face of the driving shaft, and when the driving shaft penetrates through the through hole and is inserted into the connecting concave hole, the clamping protrusion is matched with the clamping groove;

the outer peripheral face of the middle of the transmission rod is provided with a limiting shoulder, a limiting part is arranged inside the middle supporting part, and the limiting part is matched with the limiting shoulder. The structure is convenient for the assembly and the axial positioning of the transmission rod.

As another improvement, the upper part of the brush rod is pivoted with a rotating seat, a connecting shaft extends outwards from the back of the brush disc, the connecting shaft and the axial direction can move, and the connecting shaft is connected to the rotating seat in a circumferential fixed mode, one end of the L-shaped linkage rod is connected with the brush disc through the connecting rotating seat, and when the transmission rod is driven by the driving shaft to rotate back and forth along the circumferential direction, the transmission rod drives the brush disc to rotate back and forth through the L-shaped linkage rod and the rotating seat.

Furthermore, the rotating seat is provided with an outer cylindrical surface and matching holes axially distributed along the outer cylindrical surface, the connecting shaft on the brush disc is inserted into the matching holes, the upper part of the brush rod is provided with an inner cylindrical surface, and the inner cylindrical surface is matched with the outer cylindrical surface; a limiting groove is radially distributed in the middle of the connecting shaft, the upper part of the brush rod is also pivoted with a first limiting pin axially parallel to the outer cylindrical surface, a radial limiting convex part is arranged on the first limiting pin, and the first limiting pin is rotated to enable the radial limiting convex part to be matched with the limiting groove or separated from the limiting groove; a connecting hole is formed in the rotating seat, and one end of the L-shaped linkage rod is inserted into the connecting hole. Therefore, only the brush disc and the bristles need to be replaced after the bristles on the electric toothbrush head are worn, the whole electric toothbrush head does not need to be replaced, and the use cost of the electric toothbrush can be effectively reduced.

Furthermore, the upper part of the brush rod is also provided with a second limiting pin which is axially vertical to the outer cylindrical surface, and the second limiting pin clamps the rotating seat so that the rotating seat can not be separated from the brush rod.

Furthermore, a tension spring is arranged between the first limit pin and the brush rod, one end of the tension spring is connected to the first limit pin, the other end of the tension spring is connected to the brush rod, and the radial limit convex part can be stably matched with the limit groove through the tension force of the tension spring; a bayonet is arranged at the rear end of the first limiting pin, a through hole corresponding to the bayonet is formed in the rear end of the upper portion of the brush rod, and a key is inserted into the bayonet through the through hole and can rotate the first limiting pin. This allows for a more rapid replacement of the brush plate and bristles.

Further, the brush rod comprises a head part, a middle supporting part and a clamping part, the lower end of the head part is sleeved with the upper end of the middle supporting part, and the clamping part is clamped with the middle supporting part; the transmission rod is pivoted in the middle supporting part, and the axial direction of the transmission rod is limited together with the clamping part through the middle supporting part; the rotating seat is arranged on the head, and the through hole corresponding to the bayonet is arranged on the head; the head is internally provided with a hinged seat, the middle part of the first limiting pin is pivoted on the hinged seat, and the rear end of the first limiting pin is matched on the through hole corresponding to the bayonet.

Furthermore, the rotating seat is provided with an outer cylindrical surface and a matching hole axially distributed along the outer cylindrical surface, the connecting shaft on the brush disc is inserted into the matching hole, the upper part of the brush rod is provided with an inner cylindrical surface, and the inner cylindrical surface is matched with the outer cylindrical surface; the rear end of one elastic part is connected to the rear portion of the connecting shaft, the front end of the elastic part is provided with a limiting convex part, the upper portion of the brush rod is provided with a limiting through hole, the limiting convex part is matched on the limiting through hole to limit axial displacement of the connecting shaft, the limiting convex part is pressed down, and the limiting convex part is separated from the limiting through hole to remove axial displacement limitation of the connecting shaft. The structure can also facilitate the replacement of the brush disk and the brush hair, and reduce the use cost of the electric toothbrush.

Furthermore, the outer surface of the rotating seat is also provided with a abdication through hole communicated with the matching hole, and the limiting convex part can extend out of the abdication through hole or be pressed into the matching hole; and the upper part of the brush rod is also provided with a limiting pin which is axially vertical to the connecting shaft, and the limiting pin is inserted into the abdicating through hole and clamps the rotating seat so that the rotating seat can not be separated from the brush rod. Thus, the rotating seat can be prevented from being separated from the brush rod, and the elastic part can move freely.

The utility model discloses a L shape gangbar one end forms with the brush dish and is connected, and the L shape gangbar other end is connected with transfer line upper portion, and the L shape gangbar other end does not coincide with transfer line rotation central axis. Therefore, the L-shaped linkage rod and the transmission rod are linked with each other to drive the brush disc to rotate back and forth, the transmission part has a simple structure, and is convenient to assemble and high in transmission reliability.

Drawings

FIG. 1 is a perspective view of a conventional electric toothbrush driving body of the present invention;

FIG. 2 is a perspective view of a first embodiment of the present invention;

FIG. 3 is a perspective view of a brush bar of the hidden portion of FIG. 2;

fig. 4 is a top view of the first embodiment of the present invention;

FIG. 5 isbase:Sub>A sectional view A-A of FIG. 4;

FIG. 6 is a cross-sectional view B-B of FIG. 4;

FIG. 7 is a perspective view of a brush bar according to a first embodiment of the present invention;

FIG. 8 is an exploded perspective view of the brush bar of FIG. 7;

FIG. 9 is a partial cross-sectional structural view of the first embodiment of the present invention in cooperation with the drive body of the electric toothbrush of FIG. 1;

FIG. 10 is a perspective view of a second embodiment of the present invention;

FIG. 11 is a perspective view of a hidden portion of the brush bar of FIG. 10;

fig. 12 is a top view of a second embodiment of the present invention;

FIG. 13 is a cross-sectional view C-C of FIG. 12;

FIG. 14 is a cross-sectional view D-D of FIG. 12;

FIG. 15 is a perspective view of a brush bar according to a second embodiment of the present invention;

FIG. 16 is a perspective view of a second embodiment of the rotary base of the present invention;

FIG. 17 is a perspective view of a brush plate according to a second embodiment of the present invention;

FIG. 18 is a partial cross-sectional structural view of a second embodiment of the present invention in cooperation with the drive body of the electric toothbrush of FIG. 1;

fig. 19 is a perspective view of a third embodiment of the present invention;

FIG. 20 is a perspective view of a hidden portion of the brush bar of FIG. 19;

fig. 21 is a top view of a third embodiment of the present invention;

FIG. 22 is a cross-sectional view E-E of FIG. 21;

FIG. 23 is a perspective view of a brush bar according to a third embodiment of the present invention;

FIG. 24 is a perspective view of a rotary base according to a third embodiment of the present invention;

fig. 25 is a perspective view of a brush plate according to a third embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the drawings and specific embodiments.

The embodiment I is shown in figures 1 to 9, and the electric toothbrush head comprises a brush rod 1 and a brush disc 2, wherein a cavity 1a is arranged in the middle of the brush rod 1, the cavity 1a is communicated with one side of the upper end of the brush rod 1 and the lower end face of the brush rod 1, brush bristles 2a are fixedly connected to the brush disc 2, the brush disc 2 is connected to the upper end of the brush rod 1 and can rotate relative to the brush rod 1, a transmission rod 3 is arranged in the cavity 1a of the brush rod 1, one end of an L-shaped linkage rod 4 is connected with the brush disc 2, the other end of the L-shaped linkage rod 4 is connected with the upper part of the transmission rod 3, and the other end of the L-shaped linkage rod 4 is not coincident with the rotation central axis of the transmission rod 3; when the electric toothbrush head is arranged on the electric toothbrush driving body 100, the lower part of the transmission rod 3 is connected with the driving shaft 10 of the electric toothbrush driving body 100, the transmission rod 3 is driven by the driving shaft 10 to rotate back and forth along the circumferential direction, and the transmission rod 3 drives the brush disc 2 to rotate back and forth through the L-shaped linkage rod 4.

More specifically, the upper part of the transmission rod 3 is provided with a first connecting hole 31, the central axis of the first connecting hole 31 is parallel to the rotating central axis of the transmission rod 3 but does not coincide with the rotating central axis of the transmission rod, and the first connecting hole 31 is a through hole; the brush plate 2 is provided with a second connecting hole 21, the central axis of the second connecting hole 21 is parallel to but not coincident with the rotating central axis of the brush plate 2, and the second connecting hole 21 is a blind hole; one end of the L-shaped linkage rod 4 is inserted in the second connecting hole 21, and the other end is inserted in the first connecting hole 31.

The brush rod 1 comprises a head part 11, a middle supporting part 12 and a clamping part 13, the lower end of the head part 11 is sleeved with the upper end of the middle supporting part 12, the clamping part 13 is clamped with the middle supporting part 12, a through groove 12a is formed in the middle lower part of the middle supporting part 12, clamping concave holes 12b are formed in two inner sides of the through groove 12a, clamping hooks 13a are formed in two sides of the clamping part 13, the clamping part 13 is partially embedded into the through groove 12a, and each clamping hook 13a is matched with one clamping concave hole 12 b; the transmission rod 3 is pivoted in the middle support part 12, and the axial direction of the transmission rod 3 is limited together with the clamping part 13 through the middle support part 12.

Head 11 is equipped with a plurality of elastic joint convex parts 111 in, and the free end of joint convex part 111 is equipped with pothook 112, and a plurality of joint convex part 111 medial surfaces are on same face of cylinder, brush dish 2 keeps away from brush hair 2a one side and outwards extends a pin joint axle 2b, and pin joint axle 2b middle part is equipped with annular positioning groove 21b, the pin joint axle 2b outer peripheral face cooperatees with the medial surface of a plurality of joint convex parts 111, and pothook 112 cooperation on every joint convex part 111 is in on the annular positioning groove 21 b.

The lower end of the driving rod 3 is provided with a connecting concave hole 32, the inner side surface of the connecting concave hole 32 is provided with a clamping protrusion 33, the clamping part 13 is provided with a convex part 131 which is sleeved with the connecting concave hole 32, the convex part 131 extends upwards from one end surface 132 of the clamping part 13, the connecting concave hole 32 on the driving rod 3 is sleeved on the convex part 131, the lower end of the driving rod 3 is propped against the end surface 132, the clamping part 13 is also provided with a through hole 133 which corresponds to the connecting concave hole 32, the outer peripheral surface of the driving shaft 10 is provided with a clamping groove 101, and when the driving shaft 10 passes through the through hole 133 and is inserted into the connecting concave hole 32, the clamping protrusion 33 is matched with the clamping groove 101;

the outer peripheral surface of the middle part of the transmission rod 3 is provided with a limiting shoulder 34, the middle support part 12 is internally provided with a limiting part 121, and the limiting part 121 is matched with the limiting shoulder 34. The axial direction of the transmission lever 3 is limited by the limit portion 121 of the intermediate support portion 12 and the end surface 132 of the engagement portion 13.

The brush rod 1 and the brush disc 2 can be formed by injection molding.

In the use of this embodiment, as further shown in fig. 9, the driving shaft 10 of the driving body 100 of the electric toothbrush is inserted into the connecting concave hole 32 at the lower end of the driving rod 3, and the locking groove 101 on the outer peripheral surface of the driving shaft 10 is matched with the locking protrusion 33 on the driving rod 3; the lower part of the brush rod 1 is matched with the shell of the electric toothbrush driving body 100 and is relatively fixed, so that the switch 100a of the electric toothbrush driving body 100 is pressed, the driving shaft 10 rotates back and forth along the circumferential direction, the transmission rod 3 is driven by the driving shaft 10 to rotate back and forth along the circumferential direction, the transmission rod 3 drives the brush disc 2 to rotate back and forth through the L-shaped linkage rod 4, and the brush disc 2 can drive the bristles 2a to rotate back and forth to brush teeth electrically.

In a second embodiment, and as shown in figures 10 to 18, a powered toothbrush head, which differs from the first embodiment in that: a rotating seat 5 is pivoted on the upper portion of the brush rod 1, a connecting shaft 21 extends outwards from the back of the brush disc 2, the connecting shaft 21 is connected to the rotating seat 5 in an axial displaceable circumferential fixing mode, one end of an L-shaped linkage rod 4 is connected with the brush disc 2 through the connecting rotating seat 5, and when the transmission rod 3 is driven to rotate back and forth along the circumferential direction through the driving shaft 10, the transmission rod 3 drives the brush disc 2 to rotate back and forth through the L-shaped linkage rod 4 and the rotating seat 5.

More specifically, the rotating seat 5 has an outer cylindrical surface 51 and a matching hole 52 axially distributed along the outer cylindrical surface 51, the connecting shaft 21 on the brush disc 2 is inserted into the matching hole 52, an inner cylindrical surface 111 is arranged at the upper part of the brush rod 1, namely the upper head 11 of the brush rod 1, the inner cylindrical surface 111 is matched with the outer cylindrical surface 51, and the rotating seat 5 can be formed by injection molding; the middle part of the connecting shaft 21 is provided with a limiting groove 211 distributed along the radial direction, the upper part of the brush rod 1 is also pivoted with a first limiting pin 6 axially parallel to the outer cylindrical surface 51, the head part of the brush rod 1 is provided with a hinged seat 112, the middle part of the first limiting pin 6 is pivoted on the hinged seat 112, the first limiting pin 6 is provided with a radial limiting convex part 61, and the first limiting pin 6 is rotated to enable the radial limiting convex part 61 to be matched with the limiting groove 211 or separated from the limiting groove 211.

The upper part of the brush rod 1, namely the upper head part 11 of the brush rod 1, is also provided with a second limit pin 7 which is axially vertical to the outer cylindrical surface 51, and one end of the rotating seat 5 is clamped by the second limit pin 7 so that the rotating seat 5 can not be separated from the brush rod 1.

First spacer pin 6 with be equipped with an extension spring 8 between the brush-

holder stud

1, 8 one ends of extension spring are connected on first spacer pin 6, the other end is connected on brush-holder stud 1, specifically are equipped with a spliced pole 113 in the head 11 of brush-holder stud 1, and the other end of extension spring 8 is connected on spliced pole 113, makes this radial spacing convex part 61 can stabilize the cooperation on this spacing groove 211 through the pulling force of extension spring 8.

A bayonet 62 is provided at the rear end of the first stopper pin 6, a through hole 114 corresponding to the bayonet 62 is provided at the upper portion of the brush holder 1, i.e., the rear end of the head 11, and a key is inserted into the bayonet 62 through the through hole 114 to rotate the first stopper pin 6. The rear end of the first limit pin 6 is matched on the through hole 114 corresponding to the bayonet 62.

The rotating seat 5 is further provided with a connecting hole 53, the connecting hole 53 is a through hole, and one end of the L-shaped linkage rod 4 is inserted into the connecting hole 53.

The brush rod 1 of the present embodiment has the same structure and connection manner of the middle support portion 12 and the clamping portion 13 as the first embodiment except that the head portion 11 is different from the head portion of the first embodiment.

When the present embodiment is used, as further shown in fig. 18, the driving shaft 10 of the driving body 100 of the electric toothbrush is inserted into the connecting concave hole 32 at the lower end of the driving rod 3, and the locking groove 101 on the outer peripheral surface of the driving shaft 10 is matched with the locking protrusion 33 on the driving rod 3; the lower part of the brush rod 1 is matched with the shell of the electric toothbrush driving body 100 and is relatively fixed, so that the switch 100a of the electric toothbrush driving body 100 is pressed, the driving shaft 10 rotates back and forth along the circumferential direction, the transmission rod 3 is driven by the driving shaft 10 to rotate back and forth along the circumferential direction, the transmission rod 3 drives the brush disc 2 to rotate back and forth through the L-shaped linkage rod 4 and the rotating seat 5, and the brush disc 2 can drive the bristles 2a to rotate back and forth to brush teeth electrically.

In this embodiment, the brush plate 2 with the brush bristles 2a can be replaced independently, when the brush bristles 2a are worn, a key is inserted into the bayonet 62 through the through hole 114 to rotate the first limit pin 6, so that the radial limit convex part 61 is separated from the limit groove 211, the axial displacement limitation of the connecting shaft 21 is removed, the brush plate 2 can be detached, a new brush plate 2 with the brush bristles 2a is replaced, then the key is pulled out, and the radial limit convex part 61 is matched with the limit groove 211 again to limit the axial displacement of the connecting shaft 21, so that the brush plate can be put into use again, and the use cost of the electric toothbrush is effectively reduced.

Third embodiment, fig. 19-25 show a powered toothbrush head which differs from the second embodiment in that: the rear end of an elastic part 22a is connected with the rear part of the connecting shaft 22, the front end of the elastic part 22a is provided with a limit convex part 22b, the upper part of the brush rod 1, namely the head part 11 of the brush rod 1 is provided with a limit through hole 11a, the limit convex part 22b is matched on the limit through hole 11a to limit the axial displacement of the connecting shaft 22, the limit convex part 22b is pressed down, and the limit convex part 22b is separated from the limit through hole 11a to release the axial displacement limit of the connecting shaft 22.

The rotating seat 5 is provided with an outer cylindrical surface 5a and a matching hole 5b axially distributed along the outer cylindrical surface 5a, the connecting shaft 22 on the brush disc 2 is inserted into the matching hole 5b, the upper part of the brush rod 1 is provided with an inner cylindrical surface 11b, and the inner cylindrical surface 11b is matched with the outer cylindrical surface 5 a.

The outer surface of the rotating seat 5 is also provided with a yielding through hole 5c communicated with the matching hole 5b, and the limiting convex part 22b can extend out of the yielding through hole 5c or be pressed into the matching hole 5b; the upper part of the brush rod 1, namely the head part 11 of the brush rod 1, is also provided with a limit pin 11c which is vertical to the axial direction of the connecting shaft 22, and the limit pin 11c is inserted into the abdicating through hole 5c and clamps the rotating seat 5 to ensure that the rotating seat 5 can not be separated from the brush rod 1.

The brush disc 2, the connecting shaft 22 and the elastic part 22a can be integrally formed by injection molding, and the rotating seat 5 can also be formed by injection molding. The rotating seat 5 is also provided with a connecting hole 53, and one end of the L-shaped linkage rod 4 is inserted in the connecting hole 53.

The matching mode of the embodiment and the electric toothbrush driving body is the same as that of the embodiment, when the bristles 2a are abraded, the elastic part 22a is pressed down by a tool through the limiting through hole 11a, the elastic part 22a is pressed into the matching hole 5b, the axial displacement limitation of the connecting shaft 22 is removed, the brush disc 2 with the abraded bristles 2a can be detached, then a new brush disc 2 with the bristles 2a is replaced, after the connecting shaft 22 is inserted into the matching hole 5b in place, the limiting convex part 22b is matched on the limiting through hole 11a due to the action of the elastic part 22a, the axial displacement of the connecting shaft 22 is limited, and the electric toothbrush driving body can be normally matched for use. So as to effectively reduce the use cost of the electric toothbrush.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides an electric toothbrush head, includes brush-holder stud and brush dish, is equipped with the cavity in the middle of the brush-holder stud, is equipped with the brush hair on the brush dish, and the brush dish is connected in brush-holder stud upper end and can rotate its characterized in that for the brush-holder stud: a transmission rod is arranged in a cavity of the brush rod, one end of an L-shaped linkage rod is connected with the brush disc, the other end of the L-shaped linkage rod is connected with the upper part of the transmission rod, and the other end of the L-shaped linkage rod is not coincident with the rotation central axis of the transmission rod; when the electric toothbrush head is arranged on the electric toothbrush driving body, the lower part of the transmission rod is connected with the driving shaft of the electric toothbrush driving body, the transmission rod is driven by the driving shaft to rotate back and forth along the circumferential direction, and the transmission rod drives the brush disc to rotate back and forth through the L-shaped linkage rod.

2. An electrically powered toothbrush head according to claim 1 wherein: the upper part of the transmission rod is provided with a first connecting hole, the central axis of the first connecting hole is parallel to the rotating central axis of the transmission rod but is not superposed with the rotating central axis of the transmission rod, the brush disc is provided with a second connecting hole, and the central axis of the second connecting hole is parallel to the rotating central axis of the brush disc but is not superposed with the rotating central axis of the brush disc; one end of the L-shaped linkage rod is inserted in the second connecting hole, and the other end of the L-shaped linkage rod is inserted in the first connecting hole.

3. An electrically powered toothbrush head according to claim 1 or claim 2 characterised in that: the brush rod comprises a head part, a middle supporting part and a clamping part, the lower end of the head part is sleeved with the upper end of the middle supporting part, and the clamping part is clamped with the middle supporting part; the transmission rod is pivoted in the middle supporting part, and the axial direction of the transmission rod is limited together by the middle supporting part and the clamping part.

4. A powered toothbrush head according to claim 3 wherein: be equipped with a plurality of elastic joint convex parts in the head, the free end of joint convex part is equipped with the pothook, and a plurality of joint convex part medial surfaces are in on same face of cylinder, brush hair one side outwards extends a pin joint axle is kept away from to the brush dish, and pin joint axle middle part is equipped with annular positioning groove, pin joint off-axial peripheral face cooperatees with a plurality of joint convex part medial surfaces, and the pothook cooperation on every joint convex part is in on the annular positioning groove.

5. A powered toothbrush head according to claim 3 characterised in that: the lower end of the transmission rod is provided with a connecting concave hole, the inner side surface of the connecting concave hole is provided with a clamping protrusion, the clamping part is provided with a convex part sleeved with the connecting concave hole, the clamping part is also provided with a through hole corresponding to the connecting concave hole, the outer peripheral surface of the driving shaft is provided with a clamping groove, and when the driving shaft passes through the through hole and is inserted into the connecting concave hole, the clamping protrusion is matched with the clamping groove;

the outer peripheral face of the middle of the transmission rod is provided with a limiting shoulder, a limiting part is arranged inside the middle supporting part, and the limiting part is matched with the limiting shoulder.

6. An electrically powered toothbrush head according to claim 1 wherein: a rotating seat is pivoted on the upper portion of the brush rod, a connecting shaft extends outwards from the back of the brush disc, the connecting shaft and an axial displaceable circumferential fixing mode are connected to the rotating seat, one end of the L-shaped linkage rod is connected with the brush disc through the connecting rotating seat, and when the transmission rod is driven to rotate back and forth along the circumferential direction through the driving shaft, the transmission rod drives the brush disc to rotate back and forth through the L-shaped linkage rod and the rotating seat.

7. An electrically powered toothbrush head according to claim 6 wherein: the rotating seat is provided with an outer cylindrical surface and matching holes axially distributed along the outer cylindrical surface, the connecting shaft on the brush disc is inserted into the matching holes, the upper part of the brush rod is provided with an inner cylindrical surface, and the inner cylindrical surface is matched with the outer cylindrical surface;

a limiting groove is radially distributed in the middle of the connecting shaft, the upper part of the brush rod is also pivoted with a first limiting pin axially parallel to the outer cylindrical surface, a radial limiting convex part is arranged on the first limiting pin, and the first limiting pin is rotated to enable the radial limiting convex part to be matched with the limiting groove or separated from the limiting groove;

a connecting hole is formed in the rotating seat, and one end of the L-shaped linkage rod is inserted into the connecting hole.

8. An electrically powered toothbrush head according to claim 7 wherein: and the upper part of the brush rod is also provided with a second limiting pin which is axially vertical to the outer cylindrical surface, and the second limiting pin clamps the rotating seat so that the rotating seat can not be separated from the brush rod.

9. An electrically powered toothbrush head according to claim 7 wherein: a tension spring is arranged between the first limiting pin and the brush rod, one end of the tension spring is connected to the first limiting pin, the other end of the tension spring is connected to the brush rod, and the radial limiting convex part can be stably matched on the limiting groove through the tension force of the tension spring;

a bayonet is arranged at the rear end of the first limiting pin, a through hole corresponding to the bayonet is formed in the rear end of the upper portion of the brush rod, and a key is inserted into the through hole and can rotate through the bayonet.

10. An electrically powered toothbrush head according to claim 9 wherein: the brush rod comprises a head part, a middle supporting part and a clamping part, the lower end of the head part is sleeved with the upper end of the middle supporting part, and the clamping part is clamped with the middle supporting part; the transmission rod is pivoted in the middle supporting part, and the axial direction of the transmission rod is limited together with the clamping part through the middle supporting part; the rotating seat is arranged on the head, and the through hole corresponding to the bayonet is arranged on the head; the head is internally provided with a hinged seat, the middle part of the first limiting pin is pivoted on the hinged seat, and the rear end of the first limiting pin is matched on the through hole corresponding to the bayonet.

11. An electrically powered toothbrush head according to claim 6 wherein: the rotating seat is provided with an outer cylindrical surface and matching holes axially distributed along the outer cylindrical surface, the connecting shaft on the brush disc is inserted into the matching holes, the upper part of the brush rod is provided with an inner cylindrical surface, and the inner cylindrical surface is matched with the outer cylindrical surface;

the rear end of one elastic part is connected to the rear portion of the connecting shaft, the front end of the elastic part is provided with a limiting convex part, the upper portion of the brush rod is provided with a limiting through hole, the limiting convex part is matched on the limiting through hole to limit axial displacement of the connecting shaft, the limiting convex part is pressed down, and the limiting convex part is separated from the limiting through hole to remove axial displacement limitation of the connecting shaft.

12. An electrically powered toothbrush head according to claim 11 wherein: the outer surface of the rotating seat is also provided with a abdication through hole communicated with the matching hole, and the limiting convex part can extend out of the abdication through hole or be pressed into the matching hole;

and the upper part of the brush rod is also provided with a limiting pin which is axially vertical to the connecting shaft, and the limiting pin is inserted into the abdicating through hole and clamps the rotating seat so that the rotating seat can not be separated from the brush rod.