CN-121987378-A - Toothbrush head for electric toothbrush

CN121987378ACN 121987378 ACN121987378 ACN 121987378ACN-121987378-A

Abstract

The invention provides a toothbrush head for an electric toothbrush. The toothbrush head comprises a handle part, a brush disc and a swinging rod, wherein the handle part is provided with a proximal end and a distal end, the distal end is connected to a handle main body of the electric toothbrush, the brush disc is rotatably arranged at the proximal end of the handle part, the swinging rod is arranged in the handle part, the proximal end of the swinging rod is connected to the brush disc to drive the brush disc to reciprocate, the toothbrush head further comprises a magnetic connection assembly and an elastic piece, the magnetic connection assembly comprises a magnetic connection magnetizer and a brush head permanent magnet, the magnetic connection magnetizer is provided with a first acting surface and a second acting surface, the first acting surface faces the distal end of the handle part, the second acting surface is opposite to the magnetic pole surface of the brush head permanent magnet with a gap, the magnetic connection magnetizer is fixedly connected with the handle part, the brush head permanent magnet is fixedly connected with the swinging rod, and the elastic piece is arranged to provide elastic force between the handle part and the swinging rod. The adoption of the toothbrush head effectively improves the noise and vibration of the electric toothbrush in use and reduces the energy loss.

Inventors

DAI XIAOGUO
ZHANG CHANGJIN

Assignees

戴晓国
上海携福电器有限公司

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (10)

1. A brush head for an electric toothbrush, the brush head comprising: A handle portion having a proximal end and a distal end, the distal end configured to be connected to a handle body of the electric toothbrush; a brush disc rotatably disposed at the proximal end of the handle portion, and The swing rod is arranged in the handle rod part, and swings reciprocally around the rotation axis, and the proximal end of the swing rod is connected with the brush disc to drive the brush disc to rotate reciprocally; It is characterized in that the method comprises the steps of, The toothbrush head further comprises a magnetic coupling assembly and an elastic member, The magnetic coupling assembly comprises a magnetic coupling magnetizer and a brush head permanent magnet, wherein the magnetic coupling magnetizer is provided with a first acting surface and a second acting surface, the first acting surface and the second acting surface are not coplanar, the first acting surface faces the far end of the handle rod part, the second acting surface is oppositely arranged with a section of gap from the magnetic pole surface of the brush head permanent magnet, the magnetic coupling magnetizer is fixedly connected with the handle rod part, the brush head permanent magnet is fixedly connected with the swing rod, The elastic member is arranged to provide an elastic force between the handle portion and the swing link.
2. The toothbrush head of claim 1, wherein the magnetically coupled magnetizer is formed by laminating and bending sheets of oriented magnetically permeable material, the first and second active surfaces are laminated end surfaces exposing ends of the sheets of oriented magnetically permeable material, The second active surface is closer to the proximal end of the stem than the first active surface; the second active surface is not aligned with the first active surface in the axial direction and is radially further from the axis of rotation than the first active surface.
3. The toothbrush head of claim 1, wherein the brushhead permanent magnet comprises a first brushhead permanent magnet and a second brushhead permanent magnet and is disposed on the rear end of the oscillating bar separately about the axis of rotation of the oscillating bar, the magnetic coupling assembly comprising two second active surfaces facing the first brushhead permanent magnet and the second brushhead permanent magnet, respectively, Each of the first and second brushhead permanent magnets includes a pair of pole faces opposite the second active surface, The first brush head permanent magnet and the second brush head permanent magnet are symmetrically arranged about a swinging median plane containing the swinging rod.
4. A toothbrush head according to claim 3 characterised in that the first and second head permanent magnets each comprise two adjacently arranged permanent magnet sections, the pole faces of which are opposite to the second active surface in the axial or radial direction, the pole faces of which are of opposite polarity.
5. The toothbrush head according to claim 4 wherein the pole faces of the two adjacently arranged permanent magnet sections facing away from the second active surface are connected by a shorting magnetizer which is fixed into the pendulum by insert molding.
6. The toothbrush head of claim 3, wherein the proximal end of the magnetic coupling magnetizer forms a first recess and a second recess, each recess inner side surface of the first recess and the second recess forming a second active surface, The pair of magnetic pole faces of each of the first and second brushhead permanent magnets are circumferentially opposite surfaces of the same brushhead permanent magnet, The first and second brush head permanent magnets are partially received in the first and second recesses, respectively, and the second active surface is opposite to the magnetic pole faces of the first and second brush head permanent magnets in the circumferential direction.
7. The toothbrush head according to claim 3, wherein the rear end of the swing link has a hollow portion and a sleeve portion whose rear end is open, the head permanent magnet is provided at the sleeve portion, The magnetic pole surface of the brush head permanent magnet opposite to the second acting surface protrudes out of the surface of the sleeve part.
8. The toothbrush head of claim 7, wherein the elastic member is a torsion spring disposed in the hollow portion of the sleeve portion, A slot is formed in the side wall of the sleeve part, a first fixed end of the torsion spring is fixed to the slot, and a second fixed end of the torsion spring is fixed to the handle rod part.
9. The toothbrush head of claim 1, wherein the handle portion includes a housing and a sleeve disposed inside a rear end of the housing, the sleeve having a hollow portion, the magnetically coupled magnetizer being retained by the sleeve, The first acting surface of the magnetic coupling magnetizer is exposed in the hollow part of the bushing, or the first acting surface of the magnetic coupling magnetizer is embedded in the bushing material and is close to the hollow part of the bushing, The second acting surface of the magnetic coupling magnetizer is exposed out of the near side of the bushing, or the second acting surface of the magnetic coupling magnetizer is embedded in the bushing material and near the near side of the bushing; The hollow of the sleeve is sized to receive a drive shaft permanent magnet of the electric toothbrush and the first active surface is facing the pole face of the drive shaft permanent magnet.
10. The toothbrush head of claim 9, wherein the elastic member is a torsion spring, the proximal end portion of the sleeve is provided with a boss protruding toward the proximal end, the torsion spring is sleeved on the boss, and a second fixed end of the torsion spring is fixed to the sleeve.

Description

Toothbrush head for electric toothbrush Technical Field The present invention relates to the technical field of personal care devices, and in particular to a toothbrush head for an electric toothbrush. Background Various types of electric toothbrushes and the like are currently on the market, including driving means for effecting a reciprocating motion, which are connected to an external cleaning member or operating member to effect a corresponding action. There is a kind of electric toothbrush in which a permanent magnet is mounted on a driving shaft of a handle body, and when a brush head is mounted on the handle body, the driving shaft permanent magnet of the handle body is connected to a moving part in the brush head by magnetic attraction, and drives a brush disc at a proximal end of the brush head to reciprocate under the reciprocating rectilinear movement of a driving device in the handle body. However, in such electric toothbrushes, the drive shaft of the handle body and the moving part of the brush head are mechanically coupled directly, and when the drive shaft of the handle body moves at high speed, there is often a slight periodic relative movement at the coupling site, which causes loss of energy and high-frequency noise. With the continuous improvement of the quality of electric toothbrushes by consumers, it is desired to further improve the high-frequency noise and vibration generated when the electric toothbrushes are used, and to further reduce the energy loss. Disclosure of Invention In order to overcome the deficiencies of the prior art, the invention provides a toothbrush head of an electric toothbrush, comprising a handle portion having a proximal end and a distal end, the distal end being configured to be connected to a handle body of the electric toothbrush, a brush plate rotatably disposed at the proximal end of the handle portion, and a swing link disposed within the handle portion, the swing link being reciprocally oscillated about an axis of rotation, the proximal end of the swing link being connected to the brush plate for reciprocal rotation, wherein the toothbrush head further comprises a magnetic coupling assembly and an elastic member, the magnetic coupling assembly comprising a magnetic coupling magnetizer and a brush head permanent magnet, wherein the magnetic coupling magnetizer has a first active surface and a second active surface, the first active surface and the second active surface being non-coplanar, the first active surface being oriented toward the distal end of the handle portion, the second active surface being disposed opposite a pole face of the brush head permanent magnet with a gap therebetween, wherein the magnetic coupling magnetizer is fixedly connected to the handle portion, the brush head permanent magnet is fixedly connected to the swing link, and the elastic member is disposed to provide an elastic force between the handle portion and the swing link. According to one aspect of the invention, the magnetic coupling magnetizer is formed by stacking and bending the oriented magnetically permeable material sheets, the first and second active surfaces are stacked end surfaces exposing ends of the plurality of oriented magnetically permeable material sheets, the second active surface is closer to the proximal end of the shank than the first active surface, the second active surface is not aligned with the first active surface in the axial direction, and the second active surface is radially farther from the rotational axis than the first active surface. According to still another aspect of the present invention, the brush head permanent magnet includes a first brush head permanent magnet and a second brush head permanent magnet and is disposed on the rear end of the swing link separately about the rotational axis of the swing link, the magnetic coupling assembly includes two second active surfaces respectively facing the first brush head permanent magnet and the second brush head permanent magnet, each of the first brush head permanent magnet and the second brush head permanent magnet includes a pair of pole faces opposing the second active surfaces, the first brush head permanent magnet and the second brush head permanent magnet being disposed symmetrically about a swing median plane containing the swing link. According to a further aspect of the invention, the first and second brush head permanent magnets each comprise two adjacently arranged permanent magnet portions, the pole faces of the two permanent magnet portions being opposite to the second active surface in an axial or radial direction, the pole faces of the two permanent magnet portions being of opposite polarity. According to a further aspect of the invention, the pole faces of the two adjacently arranged permanent magnet sections facing away from the second active surface are connected by a short-circuit conductor which is fixed into the pendulum rod by insert molding. According to still anothe