Linear vibration motor

Abstract

The utility model discloses a linear vibration motor which comprises a shell, a stator assembly and a vibrator assembly are arranged in the shell, an elastic support is arranged on the shell, a damping piece is arranged on the vibrator assembly, and the damping piece is respectively connected with the elastic support and the vibrator assembly. According to the utility model, more reasonable and uniform distribution of force generated in vibration work is realized, the amplitude is small, the problems of deformation caused by vibration deflection and collision of a shell and open welding of corresponding welding spots are solved, and the reliability of a product is further ensured; meanwhile, compared with a motor with a traditional structure, the motor has the advantages that the installation space is greatly saved, and the quality of the vibrator assembly is ensured, so that large vibration quantity is ensured, and a foundation is laid for the design of small size of the motor.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and in particular relates to a linear vibration motor. Background Art

[0002] The traditional linear vibration motor is provided with a spring piece (set between the shell and the mass block). Due to the size and structural shape of the spring piece itself, it will occupy a large installation space. In order to ensure the small size design of the motor, the mass of the vibrator will be reduced and lightened accordingly, resulting in a small vibration amount, otherwise it will affect the small size design; the traditional linear vibration motor also has the problem of unreasonable force distribution during vibration operation, which leads to deflection, and then causes the vibrator to hit the shell, resulting in deformation of the shell and the risk of opening of the corresponding solder joints, affecting the reliability of the product. Utility Model Content

[0003] In view of the defects in the prior art, the utility model provides a linear vibration motor, which ensures the quality of the vibrator and the vibration amount while ensuring the small size of the motor, and solves the problem of vibration deflection and affecting product reliability.

[0004] The technical solution provided by the utility model is: a linear vibration motor, including a shell, a stator assembly and a vibrator assembly are arranged in the shell, an elastic bracket is arranged on the shell, a damping member is arranged on the vibrator assembly, and the damping member is respectively connected to the elastic bracket and the vibrator assembly.

[0005] As an improvement, the number of the elastic brackets and the number of the damping members are both four, and the four damping members are distributed at intervals on the periphery of the vibrator assembly.

[0006] As a further improvement, the four corners of the vibrator assembly are provided with notches, and the four damping members are respectively fixed to the four notches.

[0007] As a further improvement, the vibrator assembly includes a mass block, and the four corners of the mass block are provided with the notches.

[0008] As an improvement, the elastic bracket includes a shell connecting portion connected to the shell, a damping member connecting portion connected to the damping member, and a transition connecting portion located between the shell connecting portion and the damping member connecting portion.

[0009] As a further improvement, the shell connecting portion is perpendicular to the damping element connecting portion.

[0010] As a further improvement, the transition connection portion is an arc-shaped structure.

[0011] As a further improvement, along the vibration direction of the vibrator assembly, one end of the damping member is connected to the vibrator assembly, and the other end is connected to the elastic bracket.

[0012] As an improvement, the vibrator assembly includes a mass block, and in the vibration direction of the vibrator assembly, one of the protrusion and the buffer pad is arranged at the end of the mass block, and the other is arranged on the inner wall of the shell, and the protrusion is arranged opposite to the buffer pad.

[0013] As an improvement, the damping element is made of polyurethane foam, and / or the elastic bracket is made of 301H stainless steel.

[0014] By adopting the above-mentioned technical solution, the linear vibration motor provided by the utility model has the following beneficial effects:

[0015] By setting notches, damping elements and elastic brackets at each corner of the mass block, a more reasonable and uniform distribution of the force generated during vibration operation is achieved, with a small amplitude. This solves the problem of vibration deflection, deformation caused by impact on the shell and opening of corresponding welds, thereby ensuring the reliability of the product. At the same time, compared with motors of traditional structures, it greatly saves installation space, the quality of the mass block is guaranteed, thereby ensuring a large vibration amount and laying the foundation for the design of a small motor volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 yes Figure 1 Cross-sectional view of the middle AA section;

[0019] In the figure, 1-shell; 101-silicone pad; 2-stator assembly; 201-FPCB; 202-coil; 203-iron core; 3-oscillator assembly; 301-mass block; 302-notch; 303-protrusion; 304-magnet; 305-magnetic plate; 4-elastic bracket; 401-shell connection part; 402-damping element connection part; 403-transition connection part; 5-damping element. DETAILED DESCRIPTION

[0020] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0021] like Figure 1 and Figure 2 As shown together, a linear vibration motor includes a shell 1, in which a stator assembly 2 and a vibrator assembly 3 are arranged, the stator assembly 2 includes an FPCB 201, a coil 202 and an iron core 203, the vibrator assembly 3 includes a mass block 301, a magnet 304 and a magnetic conductive plate 305, the shell as a whole is rectangular or square, an elastic bracket 4 is arranged on the shell 1, and a damping member 5 is arranged on the vibrator assembly 3, along the vibration direction of the vibrator assembly, one end of the damping member 5 is connected to the vibrator assembly 3, and the other end is connected to the elastic bracket 4.

[0022] Among them, according to the number of elastic brackets in the linear vibration motor, the above scheme includes multiple parallel implementations, such as a four-elastic bracket implementation and a double-elastic bracket implementation.

[0023] Four elastic bracket implementation methods:

[0024] like Figure 1 and Figure 2 As shown together, a damping member 5 is provided at each corner of the mass block 301, and an elastic bracket 4 is welded between the damping member 5 and the inner wall of the housing 1; in the vibration direction of the vibrator assembly 3, a safety distance is left between the mass block 301 and the inner wall of the housing 1. In this solution, the mass block 301 includes four corners, and the intersection of two adjacent sides of the mass block 301 forms the above-mentioned corners; accordingly, the number of the elastic bracket 4 and the damping member 5 are both four and are spaced and distributed on the periphery of the mass block 301.

[0025] In order to make the motor of the above-mentioned four-elastic bracket scheme smaller as a whole and have higher space utilization, in another four-elastic bracket embodiment, a notch 302 is provided at each corner of the mass block 301, and a damping member 5 is provided on the mass block 301 at a position corresponding to each notch 302. The length of the damping member 5 may be greater than or less than or equal to the length of the notch 302 along the vibration direction of the vibrator assembly, and an elastic bracket 4 is welded between the damping member 5 and the inner wall of the shell 1; in the vibration direction of the vibrator assembly 3, a safety distance is left between the mass block 301 and the inner wall of the shell 1.

[0026] In the above four elastic bracket implementation, the length direction of the damping member 5 is arranged along the vibration direction of the vibrator assembly 3; one end of the damping member 5 is embedded with the mass block 301, and the other end of the damping member 5 is bonded to the elastic bracket 4, so that one end of the damping member 5 is movably connected and the other end is fixedly connected, ensuring smooth and reliable cooperation between the damping member 5 and the mass block 301. In this embodiment, the damping member is a rectangular parallelepiped structure, and of course a cylindrical structure or other forms of structure can also be used.

[0027] In the above four elastic bracket embodiments, the elastic bracket 4 includes multiple embodiments, and in one embodiment, it specifically includes: a shell connection part 401 connected to the shell 1, a damping member connection part 402 connected to the damping member 5, and a transition connection part 403 located between the shell connection part 401 and the damping member connection part 402, and the transition connection part 403 is an arc structure to avoid the problem of stress concentration causing damage and affecting the service life. In this embodiment, the elastic bracket 4 is integrally formed, the length direction of the shell connection part 401 is parallel to the vibration direction of the vibrator assembly, and the length direction of the damping member connection part 402 is perpendicular to the length direction of the shell connection part 401. Since the length direction of the damping member is the same as the vibration direction of the vibrator assembly, that is, the shell connection part 401 is connected to the shell wall parallel to the vibration direction of the vibrator assembly.

[0028] Of course, in another embodiment of the elastic bracket 4, the following solution can also be adopted: since the length direction of the damping member is the same as the vibration direction of the vibrator assembly, the shell connection part 401 is connected to the shell wall perpendicular to the vibration direction of the vibrator assembly, that is, the damping member is located on the opposite side of the bend formed by the shell connection part 401 and the damping member connection part 402. In this embodiment, the shell connection part 401 and the damping member connection part 402 can be in a vertical relationship, in which case the elastic bracket is an L-shaped structure as a whole; they can also be in a parallel relationship, in which case the elastic bracket is a U-shaped structure as a whole. Of course, the elastic bracket 4 can be directly replaced by a spring in other embodiments.

[0029] In order to prevent the motor vibrator from hitting the shell wall and causing damage to the motor when the vibrator in the motor is subjected to excessive impact, in the above-mentioned four elastic bracket embodiments, in the vibration direction of the vibrator assembly, a silicone pad 101 for buffering the impact is provided on the inner wall of the shell perpendicular to the vibration direction of the vibrator assembly. In order to better cooperate with the silicone pad 101, in other embodiments, a protrusion 303 is provided on the end face of the mass block perpendicular to the vibration direction of the vibrator assembly, and the protrusion 303 is arranged corresponding to the silicone pad 101. Of course, the silicone pad 101 and the protrusion 303 can also be arranged interchangeably.

[0030] Figure 1 and Figure 2In the embodiment shown in which notches 302 are set at the corners of the mass block 301, a protrusion 303 is provided between the two notches 302, and a silicone pad 101 is provided on the inner wall of the shell 1 corresponding to the protrusion 303. Of course, the protrusion 303 can also be set on the shell 1, and the silicone pad 101 is set on the mass block 301. When the mass block 301 hits the shell 1, the impact force is buffered by the cooperation of the protrusion 303 and the silicone pad 101 to avoid damage to the shell 1.

[0031] Double elastic bracket implementation method:

[0032] There are multiple implementations of the damping member in the double elastic bracket implementation. In one double elastic bracket implementation, damping members 5 are respectively provided at the middle of both ends of the mass block 301 perpendicular to the vibration direction of the vibrator assembly, and the damping member 5 is directly connected to the end surface of the mass block 301. In another double elastic bracket implementation, in order to improve space utilization and make the linear vibration motor smaller as a whole, a damping member installation hole or a damping member installation groove is provided at the position where the damping member 5 is fixed on the mass block 301, and a part of the damping member 5 is inserted into the damping member installation hole or the damping member installation groove.

[0033] In the above-mentioned double elastic bracket implementation, the elastic bracket 4 has multiple implementations. In one embodiment, an elastic bracket 4 is provided at each end of the damping member 5 of the mass block. The elastic bracket 4 includes two shell connection parts and a damping member connection part located between the two shell connection parts. The elastic bracket 4 is a U-shaped structure as a whole. The two shell connection parts of the elastic bracket 4 are respectively welded to the shell wall parallel to the vibration direction of the vibrator assembly. The damping member connection part located between the two shell connection parts is connected to the damping member, and the U opening of the elastic bracket faces the corresponding damping member. In another implementation, the elastic bracket 4 is a "mouth"-shaped structure as a whole, including four connecting arms connected end to end. One of the two opposite connecting arms of the elastic bracket 4 is connected to the damping member 5, and the other connecting arm is connected to the shell wall perpendicular to the vibration direction of the vibrator assembly. Of course, the connecting arm corresponding to the shell wall can also be discontinuous, that is, two welding points are formed on the shell wall.

[0034] In order to prevent the motor vibrator from hitting the shell wall and causing damage to the motor when the vibrator in the motor is subjected to excessive impact, in the above-mentioned double elastic bracket implementation, when the elastic bracket 4 is a U-shaped structure as a whole, a silicone pad 101 for cushioning the impact is provided on the shell wall perpendicular to the vibration direction of the vibrator assembly. When the vibration amplitude of the vibrator assembly is too large, the damping element connection part connected to the damping element will hit the silicone pad 101 to achieve cushioning. When the elastic bracket 4 is a "mouth"-shaped structure as a whole, a silicone pad is provided around the end face of the mass block where the damping member 5 is located; or a silicone pad is provided around the outer side where the elastic bracket 4 is connected to the shell wall; or a silicone pad is provided on one of the end face of the mass block where the damping member 5 is located and the corresponding shell wall position, and a protrusion matching the silicone pad is provided on the other side; or in the internal space enclosed by the elastic bracket 4 and the shell wall, at least one of a pair of connecting arms respectively connected to the damping member and the shell wall is provided with a silicone pad 101; or when the connecting arm of the elastic bracket connected to the shell wall is an intermittent structure, a silicone pad 101 is provided on at least one of the connecting arm connected to the damping member and the shell wall area corresponding to the connecting arm.

[0035] In this solution, the damping member 5 is polyurethane foam; the elastic bracket 4 is an elastic bracket made of 301H stainless steel. The elastic bracket made of this material has high yield strength, good use effect and long service life.

[0036] In each specific embodiment of the four-elastic bracket implementation method and the double-elastic bracket implementation method, the damping member 5 is polyurethane foam; and / or the elastic bracket 4 is made of 301H stainless steel. The elastic bracket made of this material has high yield strength, good use effect and long service life.

[0037] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A linear vibration motor, comprising a housing, wherein a stator assembly and a vibrator assembly are arranged in the housing, characterized in that: An elastic bracket is arranged on the shell, and a damping member is arranged on the vibrator assembly. The damping member is respectively connected to the elastic bracket and the vibrator assembly.

2. The linear vibration motor according to claim 1, characterized in that: The number of the elastic brackets and the number of the damping members are both four, and the four damping members are distributed at intervals on the periphery of the vibrator assembly.

3. The linear vibration motor according to claim 2, characterized in that: The four corners of the vibrator assembly are each provided with a notch, and the four damping members are respectively fixed to the four notches.

4. The linear vibration motor according to claim 3, characterized in that: The vibrator assembly comprises a mass block, and the notches are arranged at four corners of the mass block.

5. The linear vibration motor according to claim 1, characterized in that: The elastic bracket includes a shell connecting portion connected to the shell, a damping member connecting portion connected to the damping member, and a transition connecting portion located between the shell connecting portion and the damping member connecting portion.

6. The linear vibration motor according to claim 5, characterized in that: The shell connecting portion is perpendicular to the damping element connecting portion.

7. The linear vibration motor according to claim 6, characterized in that: The transition connection portion is an arc-shaped structure.

8. The linear vibration motor according to any one of claims 1 to 7, characterized in that: Along the vibration direction of the vibrator assembly, one end of the damping member is connected to the vibrator assembly, and the other end is connected to the elastic bracket.

9. The linear vibration motor according to claim 1, characterized in that: The vibrator assembly includes a mass block. In the vibration direction of the vibrator assembly, one of a protrusion and a buffer pad is arranged at the end of the mass block, and the other is arranged on the inner wall of the shell. The protrusion is arranged opposite to the buffer pad.

10. The linear vibration motor according to claim 1, characterized in that: The damping element is made of polyurethane foam, and / or the elastic bracket is made of 301H stainless steel.

Images