Transmission structure and electric toothbrush

Abstract

A transmission structure and an electric toothbrush, comprising: an output shaft for transmitting power; the driving assembly is used for providing torque, the driving assembly comprises a driving part and a transmission part, and the driving part is used for driving the transmission part to perform eccentric motion; the connecting rod comprises a fixed part and a rotating part which are fixedly connected with each other, the fixed part is fixedly connected with the output shaft, the rotating part is in sliding connection with the transmission part, and when the transmission part performs eccentric motion, the transmission part slides along the rotating part; and the whole connecting rod and the output shaft are driven to rotate around the central axis of the output shaft in a reciprocating manner. According to the transmission structure, the power of the driving assembly is transmitted to the output shaft through one connecting rod, one connecting rod is omitted, the structure is simpler, and noise can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electric toothbrushes, in particular to a transmission structure and an electric toothbrush. Background Art

[0002] Nowadays, people's living standards have improved, and they pay more and more attention to their own health. Dental health, which was previously ignored, has also been re-emphasized. Brushing teeth is a very important part of dental health. However, due to uneven force and incorrect methods, many parts may not be brushed or not cleaned during manual toothbrushing, resulting in residual plaque. Similarly, brushing too hard can also cause wear and tear on teeth and gums.

[0003] In this situation, electric toothbrushes came into being. Electric toothbrushes can remove 38% more plaque than manual toothbrushes, and their vibration frequency is unmatched by traditional toothbrushes. They rub teeth tens of thousands of times per minute, which is more effective than the friction frequency of traditional toothbrushes more than a hundred times per minute.

[0004] In the prior art, please refer to Figure 1 The transmission structure of the electric toothbrush includes an eccentric wheel H, a first connecting rod L1 and a second connecting rod L2. The eccentric wheel H is connected to the rotating shaft A of the motor. The two ends (B and C) of the first connecting rod L1 are hinged to the eccentric wheel H and the second connecting rod L2. The other end (D) of the second connecting rod L2 is hinged to the housing. The handle of the toothbrush is fixedly connected to the end (D) of the second connecting rod L2 away from the first connecting rod L1. Figure 1 Taking the direction shown as an example, the motor drives the eccentric wheel H to rotate in the clockwise direction Q, and under the linkage of the first connecting rod L1, the second connecting rod L2 rotates around the hinge point D. L1+L2 is not less than AD+AB, and when the eccentric wheel rotates, the second connecting rod L2 reciprocates around point D, thereby realizing the vibration of the toothbrush handle.

[0005] Therefore, how to design an electric toothbrush that can reduce the noise of the transmission component is a problem that technicians in this field need to solve. Utility Model Content

[0006] In view of this, the purpose of the utility model is to provide a transmission structure, which transmits the power of the driving component to the output shaft through a connecting rod, thereby saving a connecting rod and reducing noise.

[0007] The utility model provides a transmission structure for an electric toothbrush, comprising:

[0008] Output shaft, used to transmit power;

[0009] A driving assembly, used for providing torque, the driving assembly comprising a driving member and a transmission member, the driving member being used for driving the transmission member to perform eccentric motion;

[0010] The connecting rod comprises a fixed part and a rotating part which are fixedly connected to each other, wherein the fixed part is fixedly connected to the output shaft, and the rotating part is slidably connected to the transmission member.

[0011] When the transmission member performs eccentric motion, the transmission member slides along the rotating portion and drives the entire connecting rod together with the output shaft to reciprocate around the central axis of the output shaft.

[0012] In one embodiment, the transmission member includes a main body and a cam portion, the driving member is transmission-connected to the main body for driving the main body to rotate, the cam portion is fixedly connected to one end of the main body away from the driving member, and the cam portion deviates from the center of the main body, and the main body drives the cam portion to rotate around the rotation center of the main body.

[0013] In one embodiment, the fixing portion is provided with a through hole, and the output shaft is inserted into the through hole and fixedly connected to the fixing portion.

[0014] In one embodiment, a sliding groove is provided on a side of the rotating portion facing the driving assembly, and the driving assembly is slidably connected to the connecting rod through the sliding groove.

[0015] In one embodiment, the length of the slide groove is greater than or equal to the rotation diameter of the cam portion.

[0016] In one embodiment, the fixing portion and the rotating portion are integrally formed.

[0017] In one embodiment, the driving member comprises a motor.

[0018] Another embodiment of the present application further provides an electric toothbrush, comprising the transmission structure as described above.

[0019] In one embodiment, the electric toothbrush further comprises a shell, the shell is provided with a accommodating cavity, and the accommodating cavity is used to place the transmission structure.

[0020] In one embodiment, the electric toothbrush further comprises a switch, wherein the switch is mounted on the housing and is electrically connected to the transmission structure for controlling the transmission structure.

[0021] In the transmission structure provided by the embodiment of the utility model, the transmission structure transmits power only through one connecting rod, wherein the fixed part is fixedly connected to the output shaft to drive the output shaft to move together, and the rotating part is slidably connected to the driving component, thereby converting the torque of the driving component into the reciprocating swing of the output shaft. In the transmission structure of this case, the power is transmitted through one connecting rod, which reduces noise and has a simpler structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the movement principle of the double-link structure in the background technology of this case.

[0024] Figure 2 The figure is a schematic structural diagram of an electric toothbrush according to an embodiment of the present invention.

[0025] Figure 3 for Figure 2 Cross-section view at AA in the middle.

[0026] Figure 4 for Figure 2 Cross-sectional view of BB after removing the shell.

[0027] Figure 5 for Figure 4 Cross-sectional view of the middle link after swinging.

[0028] Figure 6 for Figure 3 Schematic diagram of the three-dimensional structure of the transmission assembly shown.

[0029] Figure 7 for Figure 3 Schematic diagram of the three-dimensional structure of the middle drive component.

[0030] Figure 8 for Figure 6 Schematic diagram of the three-dimensional structure of the middle connecting rod. DETAILED DESCRIPTION

[0031] The following will describe in detail a specific embodiment of the utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the description of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the description of the present utility model, unless otherwise clearly specified and limited, the terms "set", "install", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0033] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the utility model.

[0034] The terms "first", "second", "third" and the like are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0035] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0036] It should also be noted that in the embodiments of the present application, according to Figure 4 The XY rectangular coordinate system established in is defined as follows: the side located in the positive direction of the X axis is defined as the right side, and the side located in the negative direction of the X axis is defined as the left side; the side located in the positive direction of the Y axis is defined as the top side, and the side located in the negative direction of the Y axis is defined as the bottom side.

[0037] Please refer to Figures 1 to 8 , which shows a transmission structure provided in an embodiment of the utility model, which is used for an electric toothbrush, comprising:

[0038] Output shaft 1, used to transmit power;

[0039] The driving assembly 2 is used to provide torque. The driving assembly 2 includes a driving member 21 and a transmission member 22. The driving member 21 is used to drive the transmission member 22 to perform eccentric motion.

[0040] The connecting rod 3 includes a fixed portion 31 and a rotating portion 32 that are fixedly connected to each other. The fixed portion 31 is fixedly connected to the output shaft 1, and the rotating portion 32 is slidably connected to the transmission member 22.

[0041] When the transmission member 22 performs eccentric motion, the transmission member 22 slides along the rotating portion 32 and drives the entire connecting rod 3 together with the output shaft 1 to reciprocate around the central axis of the output shaft 1 .

[0042] In this embodiment, the drive assembly 2 can provide torque, and needs to transmit the torque provided by the drive assembly 2 to the output shaft 1. However, because the output shaft 1 does not need the torque provided by the drive assembly 2 to rotate completely 360°, but needs to reciprocate within a certain angle range, the drive assembly 2 cannot be directly connected to the output shaft 1, but needs to be converted through the connecting rod 3 to convert the torque provided by the drive assembly 2 into the reciprocating rotation power required by the output shaft 1.

[0043] Please refer to Figure 4 and Figure 6 The driving member 21 in the driving assembly 2 is a power source and outputs torque. After receiving the power from the driving member 21, the transmission member 22 can perform eccentric motion.

[0044] The transmission member 22 is connected to one end of the connecting rod 3, and the other end of the connecting rod 3 is connected to the output shaft 1. The part where the connecting rod 3 is connected to the output shaft 1 is the fixed part 31, and the fixed part 31 needs to be fixedly connected to the output shaft 1, so that the connecting rod 3 can drive the output shaft 1 to move together. The part where the connecting rod 3 is connected to the driving assembly 2 is the rotating part 32, and the rotating part 32 is slidably connected to the transmission member 22.

[0045] like Figure 4 As shown, when the transmission member 22 performs eccentric motion, the entire rotation is a circular motion, and the rotation process can be divided into displacement along the X direction and displacement along the Y direction. And in this embodiment, Figure 4 At the cross section shown, the center of the output shaft 1 is colinear with the sliding path of the drive assembly 2 on the rotating part 32. That is, during the rotation of the drive assembly 2, of the two disassembled moving directions, the moving direction toward or away from the output shaft 1 is the sliding path of the drive assembly 2 on the rotating part 32.

[0046] exist Figure 4 In the figure, the Y direction is the direction toward or away from the output shaft 1. Therefore, during the rotation process, the displacement of the part of the transmission member 22 that is slidably connected to the rotating part 32 along the Y direction will not drive the rotating part 32 to move because of the relative sliding with the rotating part 32. However, the displacement along the X direction, limited by the rotating part 32, drives the rotating part 32 to reciprocate along the X direction. Because only the rotating part 32 is forced to move, and there is a certain distance between the output shaft 1 and the rotating part 32, the driving component 2 drives the connecting rod 3 to swing relative to the output shaft 1. However, because the output shaft 1 is fixedly connected to the fixed part 31, and the fixed part 31 is fixedly connected to the rotating part 32, it eventually drives the output shaft 1 to swing together.

[0047] Please refer to Figure 4 and Figure 5, the transmission member 22 moves clockwise from point M to point N. During the entire movement process, the transmission member 22 first rotates to the lower left, wherein the downward movement of the transmission member 22 slides relative to the rotating part 32, so it will not drive the rotating part 32 to rotate. When the transmission member 22 moves to the left, it is limited by the rotating part 32, so it will drive the rotating part 32 to rotate clockwise. Until the transmission member 22 moves to the left end point, it starts to move to the upper right, and then moves to the lower right. Similarly, the movement of the transmission member 22 in the up and down directions slides relative to the rotating part 32, so it will not drive the rotating part 32 to rotate. Only when it moves to the right will it drive the rotating part 32 to rotate counterclockwise.

[0048] In this embodiment, the torque output by the driving assembly 2 is converted into the swing power required by the output shaft 1 through a connecting rod 3, which saves a connecting rod and makes the structure simpler. At the same time, the noise when the power is transmitted between the two connecting rods is reduced, thereby achieving noise reduction.

[0049] In one embodiment, the transmission member 22 includes a main body 221 and a cam portion 222. The driving member 21 is transmission-connected to the main body 221 for driving the main body 221 to rotate. The cam portion 222 is fixedly connected to one end of the main body 221 away from the driving member 21, and the cam portion 222 deviates from the center of the main body 221. The main body 221 drives the cam portion 222 to rotate around the rotation center of the main body 221.

[0050] like Figure 7 As shown, the main body 221 is preferably cylindrical. The main body 221 is the part directly connected to the driving member 21, receives the power of the driving member 21, and rotates. The cam portion 222 is arranged at one end of the main body 221 away from the driving member 21, that is, the cam portion 222 is closer to the connecting rod 3 than the main body 221. The cam portion 222 is also preferably cylindrical, so that the cam portion 222 can slide more smoothly along the rotating portion 32. And the cam portion 222 needs to deviate from the center of the main body 221 to achieve eccentric motion.

[0051] In this embodiment, the cam portion 222 is disposed on the end surface of the main body portion 221 and is located on an arc concentric with the center of the main body portion 221, so that the cam portion 222 rotates around the center of the main body portion 221. In this embodiment, the rotation diameter of the cam portion 222 is equal to the diameter of the main body portion 221, which increases the swing angle of the connecting rod 3. The rotation diameter of the cam portion 222 also determines the displacement distance of the rotating portion 32 along the X direction, and then the displacement distance of the rotating portion 32 along the X direction determines the swing angle of the output shaft 1.

[0052] In one embodiment, the fixed portion 31 is provided with a through hole, and the output shaft 1 is inserted into the through hole and fixedly connected with the fixed portion 31. In one embodiment, the rotating portion 32 is provided with a sliding groove on one side facing the driving component 2, and the driving component 2 is slidably connected with the connecting rod 3 through the sliding groove, and the fixed portion 31 and the rotating portion 32 are integrally formed.

[0053] Please refer to Figure 4 and Figure 6 , the output shaft 1 passes through the through hole opened on the fixing part 31 and is fixedly connected to the fixing part 31. The outer diameter of the output shaft 1 corresponds to the inner diameter of the fixing part 31, and the fixing part 31 wraps around the outer wall of the output shaft 1. This arrangement allows the connecting rod 3 to bear the force at the middle of the output shaft 1 rather than at the end when driving the output shaft 1 to swing, so that the force is more uniform and the service life of the output shaft 1 is increased.

[0054] Please refer to Figure 8 , a slide groove is provided on the rotating part 32, and the slide groove is preferably rectangular. The width of the slide groove is along the X direction, and the length of the slide groove is along the Y direction. The width of the slide groove corresponds to the diameter of the cam part 222, thereby limiting the displacement of the cam part 222 in the X direction. The length of the slide groove needs to be greater than the rotation diameter of the cam part 222 to ensure that the cam part 222 can perform a complete rotational movement. And the fixed part 31 and the rotating part 32 are preferably integrally formed to form a connecting rod 3. This can reduce the production cost of the connecting rod 3 and improve production efficiency.

[0055] In one embodiment, the length of the slide slot is greater than or equal to the rotation diameter of the cam portion 222 , and the driving member 21 is a motor.

[0056] Please refer to Figures 4 to 6 , the driving member 21 is approximately a rectangular parallelepiped, and its volume is much larger than the transmission member 22. Because the driving member 21 needs to convert energy inside, and then the torque is output through the transmission member 22. In this embodiment, the driving member 21 uses a motor because the motor is stable and reliable. And in this embodiment, the length of the chute is preferably equal to the rotation diameter of the cam portion 222 plus the diameter of the cam portion 222. Under the premise of ensuring that the cam portion 222 can perform a complete circular motion, reducing the length of the chute can reduce the volume of the entire transmission structure and save space.

[0057] The utility model also provides an electric toothbrush, comprising the transmission structure as described above. The electric toothbrush also includes a housing 4, the housing 4 is provided with a receiving cavity, and the receiving cavity is used to place the transmission structure. The electric toothbrush also includes a switch, which is electrically connected to the transmission structure and is used to control the transmission structure.

[0058] In this embodiment, the electric toothbrush adopts the transmission structure as described above, so it can also achieve the effect of noise reduction. At the same time, the housing 4 of the electric toothbrush is preferably cylindrical, which is convenient for gripping. The transmission structure is placed in the accommodating cavity of the housing 4 and is protected by the housing 4. A switch is provided on the housing 4, and the switch is electrically connected to the drive assembly 2 in the transmission structure, so that the switch controls the opening and closing of the drive assembly 2.

[0059] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the attached claims.

Claims

1. A transmission structure for an electric toothbrush, characterized in that: include: An output shaft (1) for transmitting power; A drive assembly (2) for providing torque, the drive assembly (2) comprising a drive member (21) and a transmission member (22), the drive member (21) being used to drive the transmission member (22) to perform eccentric motion; The connecting rod (3) comprises a fixed portion (31) and a rotating portion (32) which are fixedly connected to each other, wherein the fixed portion (31) is fixedly connected to the output shaft (1), and the rotating portion (32) is slidably connected to the transmission member (22). When the transmission member (22) performs eccentric motion, the transmission member (22) slides along the rotating portion (32) and drives the entire connecting rod (3) together with the output shaft (1) to reciprocate around the central axis of the output shaft (1).

2. The transmission structure according to claim 1, characterized in that: The transmission member (22) comprises a main body (221) and a cam portion (222); the driving member (21) is transmission-connected to the main body (221) and is used to drive the main body (221) to rotate; the cam portion (222) is fixedly connected to an end of the main body (221) away from the driving member (21), and the cam portion (222) deviates from the center of the main body (221); the main body (221) drives the cam portion (222) to rotate around the rotation center of the main body (221).

3. The transmission structure according to claim 1, characterized in that: The fixing portion (31) is provided with a through hole, and the output shaft (1) is inserted into the through hole and fixedly connected to the fixing portion (31).

4. The transmission structure according to claim 2, characterized in that: A sliding groove is provided on a side of the rotating portion (32) facing the driving assembly (2), and the cam portion (222) is slidably connected to the connecting rod (3) via the sliding groove.

5. The transmission structure according to claim 4, characterized in that: The length of the sliding groove is greater than or equal to the rotation diameter of the cam portion (222).

6. The transmission structure according to claim 1, characterized in that: The fixing portion (31) and the rotating portion (32) are integrally formed.

7. The transmission structure according to claim 1, characterized in that: The driving member (21) is a motor.

8. An electric toothbrush, characterized in that: Comprising a transmission structure as described in any one of claims 1-7.

9. The electric toothbrush according to claim 8, characterized in that: The electric toothbrush further comprises a housing (4), wherein the housing (4) is provided with a receiving cavity, and the receiving cavity is used for accommodating the transmission structure.

10. The electric toothbrush according to claim 9, characterized in that: The electric toothbrush also includes a switch, which is mounted on the housing (4) and is electrically connected to the transmission structure for controlling the transmission structure.

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