CN216221808U - Electric toothbrush head and electric toothbrush - Google Patents

Abstract

The utility model discloses an electric toothbrush head and an electric toothbrush, and relates to the technical field of electric toothbrushes. The electric toothbrush head comprises a toothbrush head main body and a toothbrush rod, wherein bristles are arranged on the toothbrush head main body, the toothbrush head main body is connected with the toothbrush rod, one end of the toothbrush rod, which is far away from the toothbrush head main body, is a connecting end, a connecting groove is formed in the end surface of the connecting end, a connecting bulge is convexly arranged on the bottom wall of the connecting groove, a connecting hole is further formed in the end surface of the connecting bulge, and the connecting hole extends along the connecting bulge; the connecting hole is used for being connected with a motor output shaft of a brush holder of the electric toothbrush in a detachable mode, so that the brush holder is connected with the brush rod in a transmission mode, the brush rod can drive the bristles to vibrate, and intervals are formed between the connecting protrusions and the side wall of the connecting groove to form a sound insulation cavity. The electric toothbrush head and the electric toothbrush have the characteristic of low use noise.

Description

Electric toothbrush head and electric toothbrush

Cross Reference to Related Applications

The present invention claims priority from the filing date of 2020, 12/23, application No. 202023146088.8, entitled "brushhead and electric toothbrush".

Technical Field

The utility model relates to the technical field of electric toothbrushes, in particular to an electric toothbrush head and an electric toothbrush.

Background

Current electric toothbrush includes electronic toothbrush head and brush holder, and the brush-holder stud of electronic toothbrush head is suitable for with the motor output shaft on the brush holder and be connected, but when using electric toothbrush, the noise of brush-holder stud and motor output shaft department is great, influences user experience.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an electric toothbrush head which has the characteristic of low use noise.

It is another object of the present invention to provide a powered toothbrush which is less noisy in use.

The utility model provides a technical scheme that:

in a first aspect, the embodiment of the utility model provides an electric toothbrush head, which comprises a toothbrush head main body and a toothbrush rod, wherein bristles are arranged on the toothbrush head main body, the toothbrush head main body is connected with the toothbrush rod, one end of the toothbrush rod, which is far away from the toothbrush head main body, is a connecting end, a connecting groove is formed in the end surface of the connecting end, a connecting protrusion is convexly arranged on the bottom wall of the connecting groove, a connecting hole is further formed in the end surface of the connecting protrusion, and the connecting hole extends along the connecting protrusion; the connecting hole is used for being connected with a motor output shaft of a brush holder of the electric toothbrush in a detachable mode, so that the brush holder is connected with the brush rod in a transmission mode, the brush rod can drive the bristles to vibrate, and intervals are formed between the connecting protrusions and the side wall of the connecting groove to form a sound insulation cavity.

With reference to the first aspect, in a first implementation manner of the first aspect, a cross-sectional area of the connection groove gradually decreases in a direction from the opening to the bottom wall, and/or a gap between a side wall of the connection groove and the connection protrusion gradually decreases in a direction from the opening of the connection groove to the bottom wall.

With reference to the first aspect and the foregoing implementation manner, in a second implementation manner of the first aspect, a minimum gap between a side wall of the connecting groove and a circumferential direction of the connecting protrusion is not less than 1 mm.

With reference to the first aspect and the foregoing implementation manner, in a third implementation manner of the first aspect, a connection notch is formed in an inner wall of the connection hole, and the connection notch penetrates through a side wall of the connection hole and extends to a terminal of the connection protrusion.

With reference to the first aspect and the foregoing implementation manner, in a fourth implementation manner of the first aspect, a clamping portion is disposed on an inner wall of the connecting hole, and the clamping portion is used for being matched with the output shaft to clamp the output shaft and the brush rod.

With the combination of the first aspect and the implementation manners thereof, in a fifth implementation manner of the first aspect, the inner wall of the connecting hole is provided with two connecting notches at intervals, the two connecting notches divide the inner wall of the connecting hole into a first arc portion and a second arc portion, the radian of the first arc portion is smaller than that of the second arc portion, and the clamping portion is arranged on the first arc portion.

With reference to the first aspect and the foregoing implementation manner, in a sixth implementation manner of the first aspect, the clamping portion is a buckle protrusion protruding from an inner wall of the connection hole, a first guide inclined plane is disposed on a side surface of the buckle protrusion facing the opening of the connection hole, and the first guide inclined plane is used for guiding the output shaft to a position where an axis of the connection hole is located.

With reference to the first aspect and the foregoing implementation manner, in a seventh implementation manner of the first aspect, a positioning portion is disposed in the connection hole, the output shaft is provided with an alignment portion, and the positioning portion is matched with the alignment portion to limit an insertion direction of the brush rod and the output shaft.

With reference to the first aspect and the foregoing implementation manner, in an eighth implementation manner of the first aspect, the positioning portion includes at least two second guiding inclined planes, and distances between the at least two second guiding inclined planes and the tail end of the connecting protrusion are not equal.

With reference to the first aspect and the foregoing implementation manner, in a ninth implementation manner of the first aspect, a limiting hole is further formed in a bottom wall of the connecting hole, and the limiting hole is used for being matched with the tail end of the output shaft.

With reference to the first aspect and the foregoing implementation manner, in a tenth implementation manner of the first aspect, the limiting hole exceeds the bottom wall of the connecting groove toward the direction of the brush head main body.

With reference to the first aspect and the foregoing implementation manner, in an eleventh implementation manner of the first aspect, a depth of the limiting hole beyond the bottom wall of the connecting groove is smaller than a depth of the bottom wall of the connecting groove.

With reference to the first aspect and the foregoing implementation manner, in a twelfth implementation manner of the first aspect, the output shaft extends out from the end surface of the brush holder, and when the output shaft is mounted in the limiting hole, a gap is formed between the end surface of the brush holder and the end surface of the connecting end.

With reference to the first aspect and the foregoing implementation manner, in a thirteenth implementation manner of the first aspect, a buffer hole is further formed in the brush rod, the buffer hole is communicated with the connection hole, and the output shaft does not extend into the buffer hole.

With reference to the first aspect and the foregoing implementation manner, in a fourteenth implementation manner of the first aspect, a cross-sectional area of the buffer hole is smaller than a cross-sectional area of the connection hole, and a length of the buffer hole is greater than a length of the connection hole.

In a second aspect, the embodiment of the utility model also provides an electric toothbrush, which comprises a handle and the electric toothbrush head; the brush holder is provided with a motor, and an output shaft of the motor is in transmission connection with the brush rod, so that the brush holder can drive the bristles to vibrate.

Compared with the prior art, the electric toothbrush head provided by the embodiment of the utility model has the beneficial effects that:

this electric toothbrush head includes brush head main part and brush-holder stud, wherein, has the brush hair in the brush head main part, brush head main part and brush-holder stud integrated into one piece to, the brush-holder stud is used for being connected with the motor output shaft transmission on the brush holder, thereby makes the brush holder can loop through brush-holder stud and brush head main part and drive the brush hair vibration. Connecting grooves have been seted up to the free end of brush-holder stud, connecting grooves's the protruding connection arch that is equipped with of diapire, it has the interval to connect between arch and connecting grooves's the lateral wall, in order to form the cavity that gives sound insulation, so, divide into the structure of brush-holder stud and output shaft connection two-layer inside and outside spaced each other, the output shaft is located the inlayer with connecting bellied junction, cover and can separate this junction and the external world in outer connecting grooves lateral wall, outwards transmit with the noise that reduces the junction, make electric toothbrush head noise less when using.

The advantages of the electric toothbrush provided by the embodiment of the utility model relative to the prior art are the same as the advantages of the electric toothbrush head relative to the prior art, and the details are not repeated.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only certain embodiments of the utility model and are therefore not to be considered limiting of its scope. For a person skilled in the art, it is possible to derive other relevant figures from these figures without inventive effort.

Fig. 1 is a schematic view showing a structure of a power toothbrush head according to an embodiment of the present invention applied to a power toothbrush.

Figure 2 is a schematic view of a powered toothbrush head according to an embodiment of the present invention.

Figure 3 is a schematic perspective view of a powered toothbrush head according to an embodiment of the present invention.

Fig. 4 is a schematic cross-sectional view taken along line a-a in fig. 2.

Fig. 5 is a partially enlarged view of V in fig. 4.

Fig. 6 is a schematic view of another construction of a powered toothbrush head according to an embodiment of the present invention in use with a powered toothbrush.

Icon: 100-an electric toothbrush; 20-brush handle; 21-a motor; 22-an output shaft; 10-electric toothbrush head; 11-a brush head body; 12-bristles; 13-a brush bar; 130-a connection end; 1301-connecting grooves; 131-connecting protrusions; 1311-connecting hole; 1312-a connection gap; 1313-a clip portion; 1316 — a first guide ramp; 132-a limiting hole; 1322-a second guide ramp; 133-buffer holes.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. The terms "upper", "lower", "inner", "outer", "left", "right", and the like, refer to an orientation or positional relationship as shown in the drawings, or as would be conventionally found in use of the products of the present invention, or as would be conventionally understood by one of ordinary skill in the art, and are used merely to facilitate the description and simplify the description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, configuration, and operation in a particular orientation, and therefore should not be construed as limiting the present invention. The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

It is also to be understood that, unless expressly stated or limited otherwise, the terms "disposed," "connected," and the like are intended to be open-ended, and mean "connected," i.e., fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The following detailed description of embodiments of the utility model refers to the accompanying drawings.

Referring to fig. 1, fig. 1 is a schematic view showing a structure of a power toothbrush head 10 applied to a power toothbrush 100 according to an embodiment of the present invention.

The embodiment of the present invention provides an electric toothbrush head 10, which has a characteristic that the electric toothbrush head 10 is less noisy in use. The electric toothbrush head 10 can be applied to the electric toothbrush 100, etc., and of course, the electric toothbrush head 10 can be used independently.

The structure, the operation and the advantageous effects of the electric toothbrush head 10 according to the embodiment of the present invention will be described in detail.

Referring to fig. 2, fig. 2 is a schematic view of a powered toothbrush head 10 according to an embodiment of the present invention.

This electronic toothbrush head 10 includes brush head main part 11 and brush-holder stud 13, wherein, brush head main part 11 is last to have brush hair 12, brush head main part 11 links to each other with brush-holder stud 13, and brush-holder stud 13 is used for being connected with the transmission of brush holder 20 of electronic toothbrush 100, thereby make brush holder 20 can loop through brush-holder stud 13 and brush head main part 11 and drive the vibration of brush hair 12, in other words, the vibration of brush holder 20 can loop through brush-holder stud 13 and brush head main part 11 and transmit for brush hair 12, the vibration of brush hair 12 is favorable to cleaning the oral cavity better.

In some embodiments, the head body 11 and the shaft 13 may be integrally formed, so that the electric toothbrush head 10 has a stable structure, generates less noise when in use, and is convenient to assemble by providing the integrally formed head body 11 and shaft 13. In other embodiments, the brush head body 11 and the brush rod 13 can be connected in an assembling manner, so that the brush head body 11 and the brush rod 13 are separately formed, the structure is simpler, and the brush head body 11 can be replaced only after being worn, which is beneficial to saving the use cost of a user.

Referring to fig. 3, 4 and 5, fig. 3 is a perspective view of a powered toothbrush head 10 according to an embodiment of the present invention. Fig. 4 is a schematic cross-sectional view taken along line a-a in fig. 2. Fig. 5 is a partially enlarged view of V in fig. 4.

One end of the brush rod 13, which is far away from the brush head body 11, is a connection end 130, and a connection hole 1311 may be opened on the connection end 130, the connection hole 1311 may be used to detachably connect with an output shaft 22 of a motor 21 of a brush holder 20 of the electric toothbrush 100, in other words, the motor 21 is disposed on the brush holder 20, the output shaft 22 of the motor 21 is inserted into the connection hole 1311, so as to connect the brush holder 20 and the brush rod 13 in a transmission manner, so that when the motor 21 on the brush holder 20 is opened, vibration of the motor 21 can be transmitted to the brush rod 13, and the brush rod 13 can drive the bristles 12 to vibrate. In other words, the brush bar 13 is coupled to the brush holder 20 by inserting the output shaft 22 into the coupling hole 1311, so that the brush bar 13 can vibrate along with the brush holder 20.

Furthermore, the end surface of the connecting end 130 is further provided with a connecting groove 1301, the bottom wall of the connecting groove 1301 is convexly provided with a connecting protrusion 131, the connecting hole 1311 is arranged on the end surface of the connecting protrusion 131, or the end of the connecting protrusion 131 is concavely provided with the connecting hole 1311, the connecting hole 1311 extends along the connecting protrusion 131, and a space is arranged between the connecting protrusion 131 and the side wall of the connecting groove 1301 to form a sound insulation cavity. In other words, the connecting protrusion 131 is protruded from the bottom wall of the connecting groove 1301, and the connecting groove 1301 is not filled, so that a gap is formed between the connecting protrusion 131 and the side wall of the connecting groove 1301, and a sound insulation cavity is formed at the gap position. In this way, the material in the sound insulation cavity is removed, and the connecting protrusion 131 has a certain flexibility and elastic deformation capability due to the small diameter, so that the connecting protrusion 131 is not easily damaged when transmitting torque, and the service life of the electric toothbrush head 10 is prolonged. Moreover, the structure for connecting the brush rod 13 and the output shaft 22 is divided into an inner layer and an outer layer which are spaced apart from each other, namely, the side wall of the connecting groove 1301 is on the outer layer, the connecting protrusion 131 is on the inner layer, and the output shaft 22 is inserted into the connecting hole 1311 of the connecting protrusion 131 on the inner layer, so that the connecting position of the output shaft 22 and the connecting protrusion 131 is on the inner layer, and the side wall of the connecting groove 1301 covering the outer layer can separate the connecting position from the outside, so that the noise transmission of the connecting position is reduced, and the noise is small when the electric toothbrush head 10 is used. In addition, the sound transmission medium of the sound insulation cavity is air, and compared with a solid structure without the sound insulation cavity, the sound insulation cavity can further reduce the outward transmission of noise at the joint.

As shown in fig. 4 to 5, the cross-sectional area of the connection groove 1301 decreases gradually from the opening to the bottom wall, and/or the gap between the side wall of the connection groove 1301 and the connection projection 131 decreases gradually from the opening of the connection groove 1301 to the bottom wall. That is, at the upper end of the brush stick 13 in FIGS. 4 to 5, the gap between the side wall of the coupling groove 1301 and the coupling projection 131 is minimized; at the free end of the coupling protrusion 131 (i.e., the lower end of the brush bar 13 in fig. 4 to 5), the gap between the side wall of the coupling groove 1301 and the coupling protrusion 131 is maximized, so that when the output shaft 22 is coupled to the coupling protrusion 131, the amplitude of the free end of the coupling protrusion 131 is relatively large, thereby preventing the coupling protrusion 131 from colliding with the side wall of the coupling groove 1301 and also ensuring that a soundproof cavity is formed in the entire depth direction of the coupling groove 1301.

Wherein, the direction of the connection groove 1301 from the opening to the bottom wall refers to the direction from the bottom to the top in fig. 4-5. In the direction from the opening to the bottom wall, the wall thickness of the side wall of the connection groove 1301 can be set to be the same, so that the strength of the side wall of the connection groove 1301 is ensured to be uniform, and the whole side wall of the connection groove 1301 has the same isolation effect on noise in the sound insulation cavity.

The minimum gap between the sidewall of the coupling groove 1301 and the circumferential direction of the coupling projection 131 is not less than 1 mm. In other words, the difference between the radius of the sidewall of the connection groove 1301 and the radius of the connection protrusion 131 at the same height is not less than 1mm, so that a sufficient air gap is left between the sidewall of the connection groove 1301 and the connection protrusion 131, and the transmission of noise at the connection of the output shaft 22 and the connection protrusion 131 is reduced. Alternatively, the minimum gap between the sidewall of the coupling groove 1301 and the circumference of the coupling protrusion 131 may be 2mm, 3mm, 4mm, or the like.

It should be noted that a connection notch 1312 may be formed on an inner wall of the connection hole 1311, the connection notch 1312 penetrates through a side wall of the connection hole 1311 and extends to a terminal end of the connection protrusion 131, in other words, the connection notch 1312 is configured as an inverted "U" -shaped groove opened on the side wall of the connection hole 1311, and the connection protrusion 131 connected to the output shaft 22 is substantially disposed in a multi-petal shape, so that the connection hole 1311 has a certain elastic deformation capability to further improve the elasticity of the connection protrusion 131, so as to facilitate the interpolation of the output shaft 22. In addition, when the brush rod 13 is matched with the output shaft 22, the connecting hole 1311 with elastic deformation capacity is beneficial to holding the output shaft 22 tightly, and large noise is prevented from being generated at the inserting position of the brush rod 13 and the output shaft 22 when vibration is caused due to gaps existing when the brush rod 13 is inserted into the output shaft 22.

Further, the inner wall of the connecting hole 1311 can be provided with a clamping portion 1313, the clamping portion 1313 is used for being matched with the output shaft 22, so that the output shaft 22 and the brush rod 13 can be clamped and connected in a clamping mode, the connecting mode is simple and reliable, a connecting part does not need to be additionally arranged, and assembly and disassembly are all convenient.

Referring to fig. 3, two connection notches 1312 have been seted up on the inner wall of connecting hole 1311 at intervals, two connection notches 1312 divide the inner wall of connecting hole 1311 into first arc portion and second arc portion, the radian of first arc portion is less than the radian of second arc portion, therefore, first arc portion is compared in second arc portion and is taken place elastic deformation more easily, joint portion 1313 is located on the first arc portion, that is to say, joint portion 1313 is located on the first arc portion that the radian is less, thus, elastic deformation takes place easily in the connecting hole 1311 inner wall that joint portion 1313 is located, easily realize joint and separation with output shaft 22, thereby make things convenient for the assembly and the dismantlement of brush-holder 13 and output shaft 22.

It should be noted that, in this embodiment, the clamping portion 1313 is a clamping protrusion protruding from the inner wall of the connection hole 1311, and the clamping protrusion is matched with the output shaft 22, so that the structure is simple and the manufacturing is convenient.

Further, as shown in fig. 5, a side of the catching protrusion opening toward the connecting hole 1311 may be provided with a first guide slope 1316, and the first guide slope 1316 is used to guide the output shaft 22 toward a position where an axis of the connecting hole 1311 is located. In other words, the first guide slope 1316 is disposed obliquely, and when the output shaft 22 is inserted into the connecting hole 1311, the first guide slope 1316 can guide the output shaft 22 to displace toward the axis of the connecting hole 1311, thereby facilitating the insertion of the output shaft 22 into the connecting hole 1311.

In some embodiments, which are not shown, the clamping portion 1313 is a hook protruding from an inner wall of the connecting hole 1311, and the output shaft 22 may be provided with a clamping groove, and the clamping groove on the output shaft 22 is in clamping fit with the hook on the inner wall of the connecting hole 1311, so as to clamp the output shaft 22 and the brush bar 13.

The connection hole 1311 is provided with a positioning portion, and the output shaft 22 is provided with an aligning portion, which is engaged with the positioning portion to define the insertion direction of the brush bar 13 and the output shaft 22. In other words, when the positioning portion is engaged with the positioning portion, the brush rod 13 and the output shaft 22 cannot rotate relatively, so that the brush rod 13 and the output shaft 22 form non-rotation engagement and engage to a predetermined orientation, and the output shaft 22 and the connection hole 1311 do not rotate relatively, so that the relative position is more stable, and the use reliability of the electric toothbrush head 10 is improved.

Referring to fig. 5, the positioning portion includes at least two second guiding inclined surfaces 1322, and distances between the at least two second guiding inclined surfaces 1322 and the ends of the connecting protrusions 131 are not equal, so as to limit an insertion direction of the output shaft 22, and ensure that the output shaft 22 does not rotate relatively when the output shaft 22 is connected with the connecting hole 1311.

In some alternative embodiments, the positioning portion may include three second guide slopes 1322, four second guide slopes 1322, or more second guide slopes 1322. The distance between the second guiding inclined surfaces 1322 and the ends of the connecting protrusions 131 is not exactly equal, so as to limit the insertion direction of the output shaft 22, and ensure that the output shaft 22 does not rotate relatively when the output shaft 22 is connected with the connecting hole 1311.

Referring to fig. 4 and 5, the bottom wall of the connecting hole 1311 may further include a limiting hole 132, and the limiting hole 132 is configured to be engaged with the end of the output shaft 22, so that the connecting length between the output shaft 22 and the brush rod 13 is longer, and the output shaft 22 can transmit torque to the brush rod 13 more stably.

The position-limiting hole 132 extends beyond the bottom wall of the connection groove 1301 in the direction of the head main body 11. Therefore, when a part of the output shaft 22 is inserted into the limiting hole 132, the output shaft 22 and the limiting hole 132 are ensured to have a certain connection length, and the length of the output shaft 22 extending into the brush rod 13 is longer, so that the output shaft 22 and the brush rod 13 are connected more firmly.

The depth of the limiting hole 132 beyond the bottom wall of the connection groove 1301 is smaller than the depth of the bottom wall of the connection groove 1301. Referring to fig. 4, the depth of the limiting hole 132 exceeding the bottom wall of the connection groove 1301 is a, the depth of the bottom wall of the connection groove 1301 is b, and a is smaller than b, so that the problem that the vibration amplitude of the section is increased due to the fact that the output shaft 22 extends into the limiting hole 132 for too long can be avoided.

In the present embodiment, the cross section of the stopper hole 132 is semicircular, but in other embodiments, the cross section of the stopper hole 132 may be other shapes, for example, a non-rotor-shaped hole groove such as a square, a triangle, etc.

In addition, a second guiding inclined surface 1322 is provided at an opening edge of one end of the limiting hole 132 near the connection hole 1311, and the second guiding inclined surface 1322 is used for guiding the end of the output shaft 22 into the limiting hole 132. Also, two second guiding inclined surfaces 1322 are formed in a high-low arrangement as shown in fig. 5, and are matched with the output shaft 22 to play a role of rotation prevention so as to accurately connect the output shaft 22 and the brush bar 13.

Figure 6 is a schematic view of an alternative construction of the powered toothbrush head 10 of the present invention in use with a powered toothbrush 100. Referring to fig. 6, the output shaft 22 extends from the end surface of the brush holder 20, and when the output shaft 22 is mounted in the limiting hole 132, a gap is formed between the end surface of the brush holder 20 and the end surface of the connecting end 130. When the electric toothbrush head 10 is connected to the handle 20 through the limiting hole 132, a gap is formed between the end surface of the handle 20 and the end surface of the electric toothbrush head 10, and vibration noise caused by collision of the two end surfaces is avoided. In other words, by forming a gap between the end surface of the handle 20 and the end surface of the connection end 130, vibration noise between the handle 20 and the power toothbrush head 10 can be reduced.

Further, the brush bar 13 may further have a buffer hole 133 formed therein, and the buffer hole 133 communicates with the connection hole 1311. The buffer hole 133 has a buffer space formed therein, so that the problem that the output shaft 22 is difficult to be inserted and removed due to air pressure is reduced by the buffer space during insertion and removal.

It should be noted that, in this embodiment, the buffer hole 133 is communicated with the connection hole 1311 through the limiting hole 132, a part of the output shaft 22 is inserted into the limiting hole 132, but the output shaft 22 does not extend into the buffer hole 133, so as to ensure that there is a sufficient buffer space in the buffer hole 133, when the output shaft 22 is plugged and unplugged, the air compression and expansion rate inside the buffer hole 133 is small, so that the output shaft 22 is easily plugged and unplugged, thereby reducing the air pressure problem generated when the output shaft 22 is plugged and unplugged, and the connection hole 1311, the limiting hole 132 and the buffer hole 133 all extend along the length direction of the brush bar 13. Of course, in other embodiments, the buffer hole 133 may be disposed on the brush rod 13 in other manners, and the embodiment is not limited to the specific manner.

In other alternative embodiments, a portion of the output shaft 22 is inserted into the buffer hole 133, and the length of the output shaft 22 inserted into the buffer hole 133 is smaller than the length of the buffer hole 133, so that a buffer space is left at the end of the buffer hole 133, thereby reducing the problem that the output shaft 22 is difficult to insert and remove due to air pressure.

The cross-sectional area of the buffer hole 133 is smaller than that of the connection hole 1311, and the length of the buffer hole 133 is greater than that of the connection hole 1311. Therefore, an enough air containing cavity is arranged in the buffer hole 133, when the output shaft 22 is plugged in and pulled out, the air compression and expansion rate inside the buffer hole 133 is small, so that the output shaft 22 is easy to plug in and pull out, in addition, the cross section area of the buffer hole 133 is smaller than that of the connecting hole 1311, and the step surfaces of the buffer hole 133 and the connecting hole 1311 have a certain limiting effect on the output shaft 22.

According to another aspect of the present invention, the electric toothbrush 100 comprises a handle 20 and the electric toothbrush head 10 of the above embodiment, the electric toothbrush head 10 is connected to the handle 20, a motor 21 may be provided on the handle 20, an output shaft 22 of the motor 21 extends out of the handle 20 and is in transmission connection with a brush rod 13 of the electric toothbrush head 10, the electric toothbrush head 10 is driven by the motor 21 to vibrate, thereby completing the tooth brushing action, and the electric toothbrush 100 also has the characteristic of less noise in use due to the electric toothbrush 100 using the electric toothbrush head 10 of the embodiment of the present invention.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that the features in the above embodiments may be combined with each other and the present invention may be variously modified and changed without conflict. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The present embodiments are to be considered as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (16)

1. An electric toothbrush head, comprising:

the toothbrush head comprises a toothbrush head main body (11), wherein bristles (12) are arranged on the toothbrush head main body (11); and

the toothbrush head comprises a brush rod (13), wherein the brush head body (11) is connected with the brush rod (13), one end, far away from the brush head body (11), of the brush rod (13) is a connecting end (130), a connecting groove (1301) is formed in the end face of the connecting end (130), a connecting bulge (131) is convexly arranged on the bottom wall of the connecting groove (1301), a connecting hole (1311) is further formed in the end face of the connecting bulge (131), and the connecting hole (1311) extends along the connecting bulge (131);

the connecting hole (1311) is detachably connected with an output shaft (22) of a motor (21) of a brush holder (20) of the electric toothbrush (100), so that the brush holder (20) and the brush rod (13) are connected in a transmission manner, the brush rod (13) can drive the bristles (12) to vibrate, and a space is reserved between the connecting protrusion (131) and the side wall of the connecting groove (1301) to form a sound insulation cavity.

2. The powered toothbrush head according to claim 1, characterised in that the cross-sectional area of the connecting groove (1301) decreases gradually from the opening to the bottom wall and/or the gap between the side wall of the connecting groove (1301) and the connecting projection (131) decreases gradually from the opening of the connecting groove (1301) to the bottom wall.

3. The powered toothbrush head according to claim 1, characterized in that the minimum gap between the side wall of the coupling groove (1301) and the circumference of the coupling projection (131) is not less than 1 mm.

4. The electric toothbrush head according to claim 1, characterized in that the inner wall of the connection hole (1311) is opened with a connection notch (1312), the connection notch (1312) penetrates the side wall of the connection hole (1311) and extends to the end of the connection protrusion (131) to make the connection hole (1311) have elastic deformation capability.

5. The electric toothbrush head according to claim 1, characterized in that the inner wall of the connecting hole (1311) is provided with a clamping part (1313), and the clamping part (1313) is used for matching with the output shaft (22) to clamp the output shaft (22) and the brush rod (13).

6. The electric toothbrush head according to claim 5, characterized in that the inner wall of the connecting hole (1311) is provided with two connecting notches (1312) at intervals, the two connecting notches (1312) divide the inner wall of the connecting hole (1311) into a first arc part and a second arc part, the radian of the first arc part is smaller than that of the second arc part, and the clamping part (1313) is arranged on the first arc part.

7. The electric toothbrush head according to claim 5, characterized in that the latch portion (1313) is a latch protrusion protruding from the inner wall of the connection hole (1311), and a first guide slope (1316) is formed on the side of the latch protrusion facing the opening of the connection hole (1311), and the first guide slope (1316) is used for guiding the output shaft (22) to the position of the axis of the connection hole (1311).

8. The electric toothbrush head according to claim 1, characterized in that a positioning part is provided in the connection hole (1311), the output shaft (22) is provided with an aligning part, and the positioning part is matched with the aligning part to limit the insertion direction of the brush rod (13) and the output shaft (22).

9. The powered toothbrush head according to claim 8, characterised in that the detent comprises at least two second guiding ramps (1322), the distances between the at least two second guiding ramps (1322) and the ends of the engaging projection (131) being unequal.

10. The electric toothbrush head according to any one of claims 1 to 9, characterized in that the bottom wall of the connecting hole (1311) is further provided with a limiting hole (132), and the limiting hole (132) is used for being matched with the tail end of the output shaft (22).

11. The powered toothbrush head according to claim 10, characterised in that the retaining hole (132) extends beyond the bottom wall of the connecting groove (1301) in the direction of the head body (11).

12. The powered toothbrush head of claim 11, characterised in that the depth of the retaining hole (132) beyond the bottom wall of the recess (1301) is less than the depth of the bottom wall of the recess (1301).

13. The powered toothbrush head according to claim 10 characterised in that the output shaft (22) extends from an end face of the handle (20) and there is a gap between the end face of the handle (20) and the end face of the link end (130) when the output shaft (22) is mounted in the retaining aperture (132).

14. The electric toothbrush head according to any one of claims 1 to 9, characterized in that the brush rod (13) is further provided with a buffer hole (133), the buffer hole (133) is communicated with the connecting hole (1311), and the output shaft (22) does not extend into the buffer hole (133).

15. The powered toothbrush head according to claim 14, characterized in that the cross-sectional area of the relief hole (133) is smaller than the cross-sectional area of the coupling hole (1311), and the length of the relief hole (133) is greater than the length of the coupling hole (1311).

16. An electric toothbrush comprising a handle (20) and an electric toothbrush head (10) according to any one of claims 1 to 15;

the brush holder (20) is provided with a motor (21), and an output shaft (22) of the motor (21) is in transmission connection with the brush rod (13).

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