Vibration reduction motor and electric toothbrush having the same

Abstract

A vibration reduction motor and an electric toothbrush having the same, the vibration reduction motor comprises a housing, an electromagnetic coil, a magnet, an output shaft, a driving structure and a balancing block, the electromagnetic coil is fixed in the housing, the magnet is arranged opposite to the electromagnetic coil, one end of the output shaft is connected to the magnet, and the other end extends out of the housing, the electromagnetic coil drives the output shaft through the magnet to reciprocate along the axis of the output shaft; the driving structure is connected to the magnet and transmits the motion state of the magnet to the balancing block, the combination of the driving structure, the magnet and the balancing block makes the balancing block and the magnet have opposite motion directions. The vibration reduction motor has a good vibration reduction effect and a relatively simple and compact structure.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a damping motor and an electric toothbrush having the same. Background Art

[0002] In handheld small appliances such as electric toothbrushes, motors are an essential component. For example, electric toothbrushes need to be equipped with motors to move the toothbrush head. However, since such small appliances need to be held by hand when in use, the vibration and noise of the motor will significantly affect the user experience of such small appliances.

[0003] In the prior art, in order to reduce the vibration and noise of the motor during operation, elastic parts, mounting plates and other structures are generally provided to play a role in vibration reduction and buffering, and silencer components, sound insulation shells and the like are provided to increase the overall sound absorption and sound insulation effects, thereby enhancing the noise reduction effect. However, on the one hand, the above-mentioned structure is generally directly provided at the connection between the motor and the small household appliance housing, which will cause the conduction of vibration and noise, causing the movement bracket to vibrate as a whole, and the vibration reduction effect is not obvious; on the other hand, since the use scenario of handheld small household appliances requires the body to be as light as possible, the above-mentioned structure will undoubtedly increase the size and weight of the body, causing obstacles to the layout of other components. Summary of the invention

[0004] The invention provides a vibration reduction motor, which has a good vibration reduction effect and a relatively simple and compact structure.

[0005] The present invention provides a vibration reduction motor, comprising a shell, an electromagnetic coil, a magnet, an output shaft, a driving structure and a balancing block, wherein the electromagnetic coil is fixed in the shell, the magnet and the electromagnetic coil are arranged opposite to each other, one end of the output shaft is connected to the magnet, and the other end extends out of the shell, the electromagnetic coil drives the output shaft through the magnet to reciprocate along the axis of the output shaft; the driving structure is connected to the magnet and transmits the motion state of the magnet to the balancing block, and the combination of the driving structure, the magnet and the balancing block ensures that the balancing block and the magnet have opposite motion directions.

[0006] Furthermore, the driving structure includes a first rack, a second rack and a gear, the first rack is connected to the magnet and extends along the axis of the output shaft, the second rack is connected to the balance block and extends along the axis of the output shaft, and the gear is rotatably disposed on the housing and is meshed with the first rack and the second rack at the same time.

[0007] Furthermore, in the axial direction perpendicular to the output shaft, the distance between the balance block and the center of the gear is equal to the distance between the end of the output shaft connected to the magnet and the center of the gear.

[0008] Furthermore, the shell includes a first shell and a second shell, the first shell and the second shell are combined with each other, and the electromagnetic coil, the magnet, the drive structure and the balance block are accommodated in the shell, and a step edge is formed on the edge of one of the first shell and the second shell. When the first shell and the second shell are combined, the step edge forms a slide groove, and slide rails are provided on the first rack and the second rack. The slide rails extend into the slide groove so that the first rack and the second rack can be movably arranged in the shell along the axial direction of the output shaft.

[0009] Furthermore, when the gear is meshed between the first rack and the second rack, the gear presses the first rack and the second rack into the corresponding sliding grooves respectively.

[0010] Furthermore, along an axial direction perpendicular to the output shaft, the gear and the electromagnetic coil at least partially overlap.

[0011] Furthermore, the vibration reduction motor includes a substrate, the magnet and the first rack are arranged on one side of the substrate, the output shaft is arranged on the other side of the substrate, and along the axial direction of the output shaft, the magnet and the first rack are respectively arranged on both sides of the output shaft.

[0012] Furthermore, the center of mass of the balancing block, the rotation center of the gear and the axis of the output shaft are located on the same plane.

[0013] Furthermore, reinforcing ribs are arranged on the substrate.

[0014] The present invention provides an electric toothbrush, comprising the above-mentioned vibration reduction motor.

[0015] In summary, in the present invention, by adding a driving structure and a balancing block, the movement direction of the balancing block is opposite to the movement direction of the magnet. During the movement, the impacts of the magnet and the balancing block due to the movement will cancel each other out, thereby achieving the purpose of reducing vibration. Furthermore, in the vibration reduction motor, vibration reduction is achieved by adding an additional balancing block, and the vibration reduction method comes from the inside of the motor. There is no need to add additional vibration reduction springs, vibration reduction pads and other components outside the motor, and its structure is also relatively simple and compact.

[0016] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a schematic diagram of the shaft side structure of a vibration reduction motor provided in an embodiment of the present invention.

[0018] Figure 2 Shown Figure 1 Schematic diagram of the exploded structure of the vibration reduction motor.

[0019] Figure 3 Shown Figure 1 Schematic diagram of the front view of the structure of the middle vibration reduction motor after removing the second shell.

[0020] Figure 4 Shown Figure 1 Schematic diagram of the shaft side structure of the middle shock absorber motor after removing the second shell.

[0021] Figure 5 Shown Figure 1 Schematic diagram of the shaft side structure of the middle shock absorber motor after removing the outer shell.

[0022] Figure 6 Shown Figure 1 Schematic diagram of the top view of the structure of the middle shock absorber motor after removing the outer shell.

[0023] Figure numerals: 10. Shell, 11. First shell, 111. Step edge, 12. Second shell, 20. Electromagnetic coil, 30. Magnet, 40. Output shaft, 50. Driving structure, 51. First rack, 52. Second rack, 53. Gear, 54. Slide rail, 60. Balance block, 70. Elastic member, 80. Base plate, 81. Reinforcing rib. DETAILED DESCRIPTION

[0024] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the present invention is described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0025] The invention provides a vibration reduction motor, which has a good vibration reduction effect and a relatively simple and compact structure.

[0026] Figure 1 FIG. 1 is a schematic diagram of the shaft side structure of a vibration reduction motor provided by an embodiment of the present invention. Figure 2 Shown Figure 1 Schematic diagram of the exploded structure of the vibration reduction motor. Figure 3 Shown Figure 1The front view of the structure of the middle vibration reduction motor after removing the second shell, Figure 4 Shown Figure 1 Schematic diagram of the shaft side structure of the middle shock absorber motor after removing the second housing. Figures 1 to 4 As shown, the vibration reduction motor provided by the present invention includes a housing 10, an electromagnetic coil 20, a magnet 30, an output shaft 40, a driving structure 50 and a balancing block 60. The electromagnetic coil 20 is fixed in the housing 10, the magnet 30 is arranged opposite to the electromagnetic coil 20, and can be arranged in the housing 10 to reciprocate along a straight line relative to the electromagnetic coil 20, one end of the output shaft 40 is connected to the magnet 30, and the other end extends out of the housing 10. The electromagnetic coil 20 drives the output shaft 40 to reciprocate along its own axial direction through the magnet 30. The driving structure 50 is connected to the magnet 30, and transmits the motion state of the magnet 30 to the balancing block 60. The cooperation of the driving structure 50, the magnet 30 and the balancing block 60 enables the balancing block 60 and the magnet 30 to have opposite motion directions.

[0027] In this embodiment, when the motor is started, a current with a periodically changing direction is introduced into the electromagnetic coil 20, which can then drive the magnet 30 to reciprocate; the reciprocating motion of the magnet 30 will drive the output shaft 40 to move, and then the power of the motor will be output outward along the circumference of the output shaft 40. In this process, the reciprocating motion of the magnet 30 will cause an impact on the motor housing 10 and generate vibration. However, since in this embodiment, a driving structure 50 and a balancing block 60 are added, the movement direction of the balancing block 60 is opposite to the movement direction of the magnet 30. Therefore, during the movement, the impacts generated by the movement of the magnet 30 and the balancing block 60 will be offset by each other, thereby achieving the purpose of reducing vibration. Furthermore, since in this vibration reduction motor, vibration reduction is performed by additionally adding a balancing block 60, the vibration reduction method comes from the inside of the motor, that is, the vibration will not be transmitted to the outside of the vibration reduction motor, and there is no need to add additional vibration reduction springs, vibration reduction pads and other components to the outside of the motor, and its structure is also relatively simple and compact.

[0028] For further information, please refer to Figures 1 to 4 In this embodiment, the driving structure 50 includes a first rack 51, a second rack 52 and a gear 53. The first rack 51 is connected to the magnet 30 and extends along the axis of the output shaft 40. The second rack 52 is connected to the balance weight 60 and extends along the axis of the output shaft 40. The gear 53 is rotatably disposed on the housing 10 and meshes with the first rack 51 and the second rack 52 at the same time.

[0029] In this embodiment, when the magnet 30 drives the output shaft 40 to reciprocate, it can drive the first rack 51 to reciprocate in the same manner as the output shaft 40. The movement of the first rack 51 will drive the gear 53 to rotate, and then drive the second rack 52 to move. The second rack 52 drives the balance block 60 to move. Since the gear 53 is disposed between the first rack 51 and the second rack 52 and meshes with both at the same time, the movement states of the first rack 51 and the second rack 52 are opposite. That is, as Figure 3 As shown, when the first rack 51 moves to the right, the second rack 52 moves to the left, and when the first rack 51 moves to the left, the second rack 52 moves to the right. Through the above arrangement, the output shaft 40 and the balance weight 60 both reciprocate, and the two have the same movement frequency but opposite movement directions, so that the balance weight 60 can offset the vibration of the magnet 30 and the output shaft 40 when they move.

[0030] Preferably, in a direction perpendicular to the axis of the output shaft 40, the distance between the balance weight 60 and the center of the gear 53 is always equal to the distance from the end of the output shaft 40 connected to the magnet 30 to the center of the gear 53. The weight of the balance weight 60 can be determined based on the sum of the magnet 30, the output shaft 40, and the load outside the output shaft 40, such as the weight of the toothbrush head.

[0031] Furthermore, in this embodiment, the vibration reduction motor is further provided with an elastic member 70, which is provided between the magnet 30 and the housing 10 and sleeved outside the output shaft 40. By providing the elastic member 70, the vibration of the magnet 30 and the output shaft 40 during the movement can be further reduced.

[0032] Please continue to refer to Figures 2 to 4 In this embodiment, the housing 10 includes a first housing 11 and a second housing 12, and the first housing 11 and the second housing 12 are combined with each other so that the electromagnetic coil 20, the magnet 30, the driving structure 50 and the balancing weight 60 are accommodated in the housing 10. A step edge 111 is formed on the edge of one of the first housing 11 and the second housing 12, and when the first housing 11 and the second housing 12 are combined, the step edge 111 forms a slide groove. A slide rail 54 is formed on the first rack 51 and the second rack 52, and the slide rail 54 extends into the slide groove, so that the first rack 51 and the second rack 52 can be movably arranged in the housing 10 along the axial direction of the output shaft 40.

[0033] It can be understood that in order to ensure the stability of the connection between the first rack 51, the second rack 52 and the gear 53, when the gear 53 is engaged between the first rack 51 and the second rack 52, the gear 53 presses the first rack 51 and the second rack 52 into their corresponding slide grooves.

[0034] Figure 5 Shown Figure 1 Schematic diagram of the shaft side structure of the middle shock absorber motor after removing the outer shell. Figure 6 Shown Figure 1 The top view of the structure of the middle shock absorber motor after removing the outer shell. Figures 1 to 6 As shown, in order to reduce the length of the vibration reduction motor in the axial direction of the output shaft 40 and meet the volume requirements of the handheld small household appliance, the gear 53 and the electromagnetic coil 20 are at least partially overlapped in the axial direction perpendicular to the output shaft 40. In other words, the projection of the gear 53 in the axial direction perpendicular to the output shaft 40 at least partially falls on the electromagnetic coil 20.

[0035] The electromagnetic coil 20 may be fixed on the first housing 11 , and the gear 53 may be fixed between the first housing 11 and the second housing 12 via a fixed shaft of the gear 53 .

[0036] The vibration reduction motor also includes a substrate 80. The magnet 30, the first rack 51 and the output shaft 40 are all arranged on the substrate 80. The magnet 30 and the first rack 51 are arranged on one side of the substrate 80, and the output shaft 40 is arranged on the other side of the substrate 80. Viewed along the axial direction of the output shaft 40. The magnet 30 and the first rack 51 are respectively arranged on both sides of the output shaft 40. The center of mass of the balancing block 60, the rotation center of the gear 53 and the axis of the output shaft 40 can be located on the same plane.

[0037] A reinforcing rib 81 may also be provided on the base plate 80 . The reinforcing rib 81 is connected to the magnet 30 , so as to increase the strength of the base plate 80 and prevent the base plate 80 from shaking during movement.

[0038] In this embodiment, the movement of the first rack 51 and the second rack 52 is limited by the slide groove on the housing 10. Therefore, the first rack 51 can apply a force to the base plate 80 so that it does not deflect during movement and can only move along the axis of the output shaft 40.

[0039] In summary, in the present invention, by adding a driving structure 50 and a balancing block 60, the movement direction of the balancing block 60 is opposite to the movement direction of the magnet 30. During the movement, the impacts generated by the movement of the magnet 30 and the balancing block 60 will offset each other, thereby achieving the purpose of reducing vibration. Furthermore, in the vibration reduction motor, vibration reduction is achieved by additionally adding a balancing block 60, and the vibration reduction method comes from the inside of the motor, and there is no need to add additional vibration reduction springs, vibration reduction pads and other components outside the motor, and its structure is also relatively simple and compact.

[0040] The present invention also provides an electric toothbrush, comprising the above-mentioned vibration reduction motor. Regarding other technical features of the electric toothbrush, please refer to the prior art and will not be described in detail here.

[0041] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A vibration reduction motor, characterized in that: The invention comprises a shell, an electromagnetic coil, a magnet, an output shaft, a driving structure and a balancing block, wherein the electromagnetic coil is fixed in the shell, the magnet is arranged opposite to the electromagnetic coil, one end of the output shaft is connected to the magnet, and the other end extends out of the shell, the electromagnetic coil drives the output shaft through the magnet to reciprocate along the axis of the output shaft; the driving structure is connected to the magnet and transmits the motion state of the magnet to the balancing block, and the combination of the driving structure, the magnet and the balancing block makes the balancing block and the magnet have opposite motion directions; the driving structure comprises a first rack, a second rack and a gear, the first rack is connected to the magnet and extends along the axis of the output shaft, the second rack is connected to the balancing block The gear is rotatably arranged on the housing and meshes with the first rack and the second rack at the same time; the housing comprises a first housing and a second housing, the first housing and the second housing are combined with each other, and the electromagnetic coil, the magnet, the driving structure and the balancing block are accommodated in the housing, a step edge is formed on the edge of one of the first housing and the second housing, when the first housing and the second housing are combined, the step edge forms a slide groove, and slide rails are arranged on the first rack and the second rack, and the slide rails extend into the slide groove, so that the first rack and the second rack can be movably arranged in the housing along the axial direction of the output shaft.

2. The vibration reduction motor according to claim 1, characterized in that: In the axial direction perpendicular to the output shaft, the distance between the balance block and the center of the gear is equal to the distance between the end of the output shaft connected to the magnet and the center of the gear.

3. The vibration reduction motor according to claim 1, characterized in that: When the gear is meshed between the first rack and the second rack, the gear presses the first rack and the second rack into the corresponding sliding grooves.

4. The vibration reduction motor according to claim 1, characterized in that: Along an axial direction perpendicular to the output shaft, the gear and the electromagnetic coil at least partially overlap.

5. The vibration reduction motor according to claim 4, characterized in that: The vibration reduction motor includes a substrate, the magnet and the first rack are arranged on one side of the substrate, the output shaft is arranged on the other side of the substrate, and along the axial direction of the output shaft, the magnet and the first rack are respectively arranged on both sides of the output shaft.

6. The vibration reduction motor according to claim 5, characterized in that: The center of mass of the balancing block, the rotation center of the gear and the axis of the output shaft are located on the same plane.

7. The vibration reduction motor according to claim 5, characterized in that: Reinforcing ribs are arranged on the base plate.

8. An electric toothbrush, characterized in that: A vibration reduction motor comprising the vibration reduction motor according to any one of claims 1 to 7.

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