Threading type rear cover, motor and electric toothbrush

Abstract

The utility model discloses a threading type rear cover, a motor and an electric toothbrush. A threading type rear cover comprises a cover main body; at least one threading hole is formed in the cover main body and penetrates through the cover main body; and the hole inner diameter of the threading hole is gradually reduced from the inner side to the outer side of the cover main body. According to the threading type rear cover provided by the utility model, the cover main body is provided with at least one threading hole, and the inner diameter of the threading hole is gradually reduced from the inner side to the outer side of the cover main body, so that compared with an equal-diameter threading hole, the threading type rear cover has the advantages that the moving space of a lead-out wire is enlarged, the loss is reduced, and the energy loss of a motor is avoided. The inner side aperture of the threading hole is large, so that the lead-out wire can pass through conveniently, and the lead-out wire can be installed more conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a threading type rear cover, a motor and an electric toothbrush. Background Art

[0002] The rotor of a conventional brushed sonic motor is connected to the outside through a rear cover. For example, a Chinese invention patent (publication number: CN110138136A) discloses a sonic motor, including a sonic motor body and a transmission shaft, wherein the transmission shaft is a hollow shaft, passes through the interior of the motor body, and has external connection ends at the upper and lower ends of the transmission shaft. The sonic motor body includes a housing, a stator assembly, a rotor assembly, a transmission shaft, a first bearing, a second bearing, and an end cover; the housing and the end cover form a storage space; the first bearing and the second bearing are respectively fixed at both ends of the transmission shaft, so that the transmission shaft passes through the storage space; the rotor assembly includes a first plastic card, a second plastic card, an iron core group, and a winding coil; the iron core group is passed through the transmission shaft, and the iron core group is keyed to the transmission shaft; the first limiter and the second limiter are respectively passed through the transmission shaft from both ends, and the iron core group, the first plastic card, and the second plastic card form a rotor core; the upper end face of the first plastic card abuts against the end face of the first bearing, and the lower end face of the first plastic card abuts against the end face of the second bearing. The cross section of the rotor core is an I-shaped, and the two winding coils are symmetrically wound on both sides of the rotor core; the wire ends of the two winding coils are respectively wound around the end of the second limiter N times to form a slow vibration wire loop, and then the wire ends extend from the end cover to the outside of the storage cavity to connect to electricity. The stator assembly comprises a stator frame and four permanent magnets embedded in the stator frame. The four permanent magnets are symmetrically distributed on both sides of the transmission shaft, and the two permanent magnets on the same side have opposite magnetic properties. Another example is a Chinese utility model patent (publication number: CN212305094U) that discloses a magnetic levitation motor for a sonic electric toothbrush, which includes a shell, a main shaft, an electromagnet mechanism, and a permanent magnet mechanism. The shell is provided with a main shaft and an electromagnet mechanism, and the main shaft is provided with a permanent magnet mechanism. The upper and lower ends of the shell are provided with an upper end cover and a lower cover respectively. The electromagnet mechanism includes an electromagnetic coil, a silicon steel sheet group, and a coil frame. The electromagnetic coil is wrapped around the silicon steel sheet group, and the silicon steel sheet group is fixed to the coil frame. The permanent magnet mechanism includes an upper limit member and a lower limit member, a strong magnetic single magnet, and a spring. The upper limit member is fixed to the main shaft, the upper end of the main shaft passes through the upper end cover and the two are rotatably connected, the lower limit member is arranged at the lower end of the main shaft, the upper end of the spring is inserted and fixed on the lower limit member, and the strong magnetic single magnet is arranged at one end close to the electromagnetic coil and the strong magnetic single magnet is engaged between the upper limit member and the lower limit member.

[0003] However, in the prior art including the above disclosed technical solution, the rear cover or end cover is usually close to the rotor, the lead wire has limited space to move, and it will cause energy loss to the motor while it is rapidly self-consuming. Utility Model Content

[0004] Based on this, it is necessary to provide a threaded back cover, motor and electric toothbrush to address the above technical problems.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] In a first aspect, a threading type back cover comprises a cover body; the cover body is provided with at least one threading hole which passes through the cover body; the inner diameter of the threading hole gradually decreases from the inner side to the outer side of the cover body.

[0007] As a preferred implementation of a threading type back cover provided by the utility model, the threading hole is a speaker hole.

[0008] As a preferred embodiment of the threading type back cover provided by the utility model, the at least one threading hole is 2 threading holes.

[0009] As a preferred embodiment of a threading type back cover provided by the utility model, the two threading holes are distributed on both sides of the cover body along the width or length direction of the cover body.

[0010] As a preferred embodiment of a threading type back cover provided by the utility model, an axis hole is opened in the middle of the inner side of the cover body for installing a rotating shaft.

[0011] As a preferred embodiment of a threading type rear cover provided by the utility model, the cover body is provided with a plurality of oil storage grooves in the circumferential direction of the shaft hole, which are communicated with the shaft hole.

[0012] As a preferred embodiment of a threading type back cover provided by the utility model, the cover body is concave inwardly at both sides along the length direction thereof to form a locking position.

[0013] As a preferred embodiment of a threading type back cover provided by the utility model, a step portion is provided on the circumferential side of the cover body.

[0014] In a second aspect, a motor comprises any one of the above-mentioned threading type rear covers.

[0015] In a third aspect, an electric toothbrush comprises any one of the above-mentioned threading type rear cover or the above-mentioned motor.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The utility model provides a threading type rear cover, the cover body is provided with at least one threading hole, the inner diameter of which gradually decreases from the inner side to the outer side of the cover body, and compared with threading holes of equal diameter, the activity space of the lead-out wire is increased, the loss is reduced, and the energy loss of the motor is not generated. The inner diameter of the threading hole is large, which is more convenient for the lead-out wire to pass through, making the installation of the lead-out wire more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the scheme in the utility model, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the structure of the utility model after the threading type rear cover is plugged into the wire;

[0020] Figure 2 This is a schematic diagram of the structure of the outer side of the threading type rear cover of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the inner side of the threading type rear cover of the utility model;

[0022] Figure 4 for Figure 3 A top view of

[0023] Figure 5 for Figure 4 A sectional perspective view at AA in the middle.

[0024] The markings in the figure are as follows:

[0025] 1. Cover body, 11. Inner side, 12. Outer side, 13. Threading hole, 14. Shaft hole, 15. Oil storage tank, 16. Clamping position, 17. Step portion;

[0026] 2. Wire. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0028] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] Example 1 Threaded back cover

[0032] Please refer to the figure, which shows a threading type back cover of this embodiment, which is applied to a motor for a toothbrush.

[0033] Specifically, the threading type back cover includes a cover body 1, which has an inner side 11 and an outer side 12. At least one threading hole 13 is opened on the cover body 1, which can be one, two or more. Each threading hole 13 passes through the cover body 1. Further, the inner diameter of the threading hole 13 gradually decreases from the inner side 11 to the outer side 12 of the cover body 1.

[0034] It can be understood that the threading hole 13 is a horn hole. The threading hole 13 located on the inner side 11 of the cover body 1 has a larger diameter than the threading hole 13 located on the outer side 12 of the cover body 1. With such a structural design, compared with the threading holes 13 of equal diameter, the threading holes 13 of variable diameter can provide a larger swing space for the lead wire 2. Moreover, the threading hole 13 located on the inner side 11 of the cover body 1 has a large diameter, which acts as a guide hole, making it easier for the lead wire 2 to pass through, making the installation of the lead wire 2 more convenient.

[0035] In this embodiment, the at least one threading hole 13 is two threading holes 13, and they are distributed on both sides of the cover body 1 along the width or length direction of the cover body 1. It is worth noting that the layout of the two threading holes 13 can be appropriately adjusted according to actual needs.

[0036] Furthermore, a shaft hole 14 is provided in the middle of the inner side 11 of the cover body 1 for mounting the rotating shaft. Furthermore, a plurality of oil storage grooves 15 are provided in the circumferential direction of the shaft hole 14 of the cover body 1, which are connected to the shaft hole 14, and can effectively prolong the lubrication effect on the rotating shaft and reduce the energy loss caused by insufficient lubrication.

[0037] Furthermore, the cover body 1 is concave inwardly on both sides along its length direction to form a locking position 16. When assembling the motor, the threading type rear cover is placed on the motor housing and needs to be reinforced. After assembly, the pressing piece of the motor housing is buckled on the locking position 16 to prevent the threading type rear cover from falling out of the motor housing.

[0038] Furthermore, a step portion 17 is provided on the circumferential side of the cover body 1. It can be understood that, in a top view, the length and width of the projection surface of the circumferential side of the cover body 1 are larger than the length and width of the projection surface of the step portion 17. In this way, during assembly, the step portion 17 can be directly embedded in the open end of the motor casing to complete the initial installation, thereby improving assembly efficiency.

[0039] Example 2 Motor

[0040] Please refer to Figure 5 This embodiment shows a motor, which includes the threading type rear cover as shown in Embodiment 1, and also includes a motor housing and a lead wire. One end of the lead wire is located in the motor housing and connected to the coil in the motor housing, and the other end passes through the threading hole of the threading type rear cover, and is led out of the motor housing to be connected to an external power source.

[0041] Example 3 Electric toothbrush

[0042] This embodiment shows an electric toothbrush, which includes the threading type rear cover shown in Example 1 or the motor shown in Example 2.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. A threading back cover, characterized in that: It comprises a cover body; the cover body is provided with at least one threading hole which penetrates the cover body; the inner diameter of the threading hole gradually decreases from the inner side to the outer side of the cover body.

2. A threading back cover according to claim 1, characterized in that: The threading hole is a speaker hole.

3. A threading back cover according to claim 1, characterized in that: The at least one threading hole is two threading holes.

4. A threading back cover according to claim 3, characterized in that: The two threading holes are distributed on both sides of the cover body along the width or length direction of the cover body.

5. The threading back cover according to claim 1, characterized in that: An axial hole is provided in the middle of the inner side of the cover body for installing the rotating shaft.

6. A threading back cover according to claim 5, characterized in that: The cover body is provided with a plurality of oil storage grooves in the circumferential direction of the shaft hole, and the oil storage grooves are communicated with the shaft hole.

7. The threading type back cover according to claim 1, characterized in that: The two sides of the cover body along the length direction are concave inwards to form a locking position.

8. The threading back cover according to claim 1, characterized in that: A step portion is provided on the circumferential side of the cover body.

9. A motor, characterized in that: It includes a threaded back cover as described in any one of claims 1-8.

10. An electric toothbrush, characterized in that: It comprises a threaded back cover as claimed in any one of claims 1 to 8 or a motor as claimed in claim 9.

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