Linear vibration motor

Abstract

This utility model relates to the field of vibration motor technology and discloses a linear vibration motor, including a cuboid housing with a accommodating space, a stator assembly, a mover assembly, an elastic element, and guide rods extending parallel to the vibration direction and passing through both sides of the mover assembly. The stator assembly and guide rods are fixed to the housing and are arranged vertically at intervals. The mover assembly includes a cuboid mass block and an integral mounting ring protruding from the middle of the outer wall of the long side of the mass block. The guide rods pass through the mounting ring, and the elastic elements are sleeved on the guide rods and located on both sides of the mounting ring. Utilizing the principle of electromagnetic induction, when the stator assembly is energized, the mover assembly is driven to reciprocate along the guide rods without swinging arbitrarily. When the power is off, the mover assembly resets due to the rebound force of the elastic elements, thereby reducing polarization and improving vibration reliability.

Description

Technical Field

[0001] This utility model relates to the field of vibration motor technology, and in particular to a linear vibration motor. Background Technology

[0002] With the development of electronic technology, portable consumer electronics products have gradually occupied the global consumer market, such as mobile phones, handheld game consoles, and multimedia entertainment devices. These electronic products generally use vibration motors for haptic feedback, such as incoming call notifications on mobile phones and vibration feedback on game consoles. To meet the needs of such a wide range of applications, the vibration performance requirements for vibration motors are becoming increasingly stringent.

[0003] Miniature linear motors are a common type of vibration motor. Their small size and stronger vibration in a specific direction make them popular in lightweight and portable electronic products. Most miniature linear motors achieve overall vibration through vibration components, the most common being springs. These springs are typically welded to a mass block and the outer shell, providing both restoring force and support for the mass block. During vibration, the mass block is highly susceptible to polarization. This type of linear motor places extremely high demands on the springs. However, springs with varying shapes inevitably experience stress concentration and elasto-plastic deformation during vibration, leading to deformation or even fatigue fracture after a certain vibration cycle or time. Furthermore, irregularly shaped springs are difficult to dimensionally control during manufacturing.

[0004] Therefore, it is necessary to provide a vibration motor that is simple in structure, has good vibration performance, and is more stable. Utility Model Content

[0005] The purpose of this invention is to provide a linear vibration motor with high vibration performance and higher stability, and its specific technical solution is as follows:

[0006] A linear vibration motor includes a cuboid housing with an accommodating space, a stator assembly, a mover assembly, an elastic element, and guide rods passing through and parallel to both sides of the mover assembly within the accommodating space. The stator assembly and guide rods are fixed to the housing, and the stator assembly and mover assembly are arranged vertically at intervals. The mover assembly includes a cuboid mass block and an integral mounting ring protruding from the middle of the outer wall of the long side of the mass block. The guide rods pass through the mounting ring, and the elastic elements are sleeved on the guide rods and located on both sides of the mounting ring.

[0007] Preferably, the housing includes an outer shell having the accommodating space and an opening at one end, and a cover plate adapted to and fastened to the opening.

[0008] Preferably, the outer casing includes a bottom wall and a side wall, and the inner wall surfaces of the bottom wall and the cover plate are respectively provided with a first fixing part and a second fixing part for fixing the guide rod.

[0009] Preferably, the mass block has a mounting hole extending through its thickness direction.

[0010] Preferably, the moving part assembly further includes a magnet, which is embedded in the mounting hole.

[0011] Preferably, the mounting ring has an embedded sliding bearing, and the guide rod passes through the sliding bearing.

[0012] Preferably, one end of the elastic element abuts against the sliding bearing, and the other end abuts against the first fixing part or the second fixing part, respectively.

[0013] Preferably, the elastic element is a helical spring, and the outer diameter of the helical spring is smaller than the minimum outer diameter of the mounting ring.

[0014] Preferably, the stator assembly includes a coil and a flexible circuit board. The flexible circuit board includes an external power terminal and an internal power terminal. The internal power terminal is attached to the inner surface of a side wall, and the external power terminal is bent from the free end of the side wall and extends out of the accommodating space before being attached to the outer surface of the side wall.

[0015] Preferably, the moving part assembly further includes a weight block, wherein the magnet, the sliding bearing, and the weight block are integrally injection molded into the mass block.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: By inserting guide rods on both sides of the mover assembly, the double guide rods distribute the gravity load of the mover assembly, effectively preventing vertical tilting during the rapid reciprocating motion of the mover assembly, reducing polarization phenomena, and ensuring more stable horizontal reciprocating motion of the mover assembly. The mover assembly will not oscillate within the accommodating space due to rapid reciprocating motion. Furthermore, the helical springs symmetrically fitted on the guide rods on both sides absorb impact through elastic deformation, reducing noise. The symmetrical distribution of the four helical springs ensures the elastic force balance on both sides of the mover assembly, avoiding uneven vibration caused by spring fatigue or installation errors. Simultaneously, it limits the amplitude of the mover assembly, disperses stress, and reduces wear caused by the mover assembly impacting the housing, making it suitable for long-term and high-frequency reciprocating motion of the mover assembly. Attached Figure Description

[0017] Figure 1 This is a 3D diagram of a linear vibration motor.

[0018] Figure 2 It is along Figure 1 Cross-sectional view of the linear vibration motor along line AA.

[0019] Figure 3This is an exploded view of the structure of a linear vibration motor.

[0020] Figure 4 It is an exploded view of the structure of the moving part, elastic element and guide rod.

[0021] in:

[0022] 1-Outer shell; 10-First fixing part; 2-Cover plate; 20-Second fixing part; 3-Stator assembly; 30-Coil; 31-Flexible circuit board; 4-Motor assembly; 40-Mass block; 41-Magnet; 42-Sliding bearing; 400-Mounting hole; 401-Mounting ring; 5-Elastic element; 6-Guide rod. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] One embodiment of the linear vibration motor of this utility model is as follows: Figures 1 to 4 As shown, the device includes a cuboid housing (not shown) with a accommodating space (not indicated), a stator assembly 3, a mover assembly 4, an elastic element 5, and guide rods 6 that pass parallel to both sides of the mover assembly 4 along the vibration direction. The elastic element 5 is sleeved on the guide rods 6. The stator assembly 3 and the guide rods 6 are fixed to the housing 1. The mover assembly 4 is supported by the guide rods 6 and suspended in the accommodating space. The stator assembly 3 and the mover assembly 4 are arranged vertically at intervals. Utilizing the principle of electromagnetic induction, when the stator assembly 3 is energized, the mover assembly 4 is driven to reciprocate along the guide rods 6 without swinging arbitrarily. When the power is off, the mover assembly 4 is reset by the rebound force of the elastic element 5.

[0025] The housing includes an outer shell 1 with an accommodating space and an opening at one end (not shown) and a cover plate 2 that is adapted to and fastened to the opening. The outer shell 1 includes a bottom wall (not shown) and a side wall (not shown). The inner wall surfaces of the bottom wall and the cover plate 2 are respectively provided with a first fixing part 10 and a second fixing part 20 for fixing the guide rod 6.

[0026] Stator assembly 3, as Figure 3 As shown, it includes a coil 30 and a flexible circuit board 31. The flexible circuit board 31 includes an external power terminal 311 and an internal power terminal 310. The internal power terminal 310 is attached to the inner surface of a side wall. The external power terminal 311 is bent from the free end of the side wall and extends out to accommodate space before being attached to the outer surface of the side wall, so that the external power terminal 311 and the internal power terminal 310 are arranged in a U-shape to save installation space for the vibration motor.

[0027] Moving component 4, such as Figure 4 As shown, the assembly includes a cuboid mass block 40, a magnet 41, and a sliding bearing 42. A mounting ring 401 is integrally protruding from the middle of the outer wall of the long side of the mass block 40. The sliding bearing 42 is embedded within the mounting ring 401. A guide rod 6 passes through the sliding bearing 42 within the mounting ring 401. An elastic element 5 is sleeved on the guide rod 6 and located on both sides of the mounting ring 401. The width of the mounting ring 401 is less than the length of the mass block 40 to provide mounting space for the elastic element 5. A mounting hole 400 is provided through the thickness direction of the mass block 40, and the magnet 41 is embedded within the mounting hole 400. The guide rods 6 on both sides of the mover assembly 4 distribute the gravitational load of the mover assembly 4, effectively preventing vertical tilting during rapid reciprocating motion, reducing polarization, and ensuring more stable reciprocating motion of the mover assembly 4 in the horizontal vibration direction, preventing swaying within the accommodating space due to rapid reciprocating motion.

[0028] Elastic element 5 is a helical spring, such as Figure 4 As shown, the helical spring stores energy by compressing and deforming in the vibration direction. Its structure is simple and easy to manufacture, making it suitable for high-frequency reciprocating motion. When the elastic element 5 is sleeved on the guide rod 6, one end of the elastic element 5 abuts against the sliding bearing 42, and the other end abuts against the first fixing part 10 or the second fixing part 20 respectively. The elastic elements 5, which are symmetrically sleeved on the guide rods 6 on both sides, absorb the impact through their own elastic deformation, reducing noise. The four elastic elements 5 are symmetrically distributed to ensure the elastic force balance on both sides of the moving part assembly 4, avoiding uneven vibration caused by fatigue of the elastic element 5 or installation errors. At the same time, it limits the amplitude of the moving part assembly 4, disperses stress, and reduces the wear caused by the moving part assembly 4 hitting the housing. It is suitable for long-term and high-frequency reciprocating motion of the moving part assembly 4. The outer diameter of the helical spring is smaller than the minimum outer diameter of the mounting ring to prevent the elastic element 5 from wearing with the housing and generating noise during the rapid reciprocating process of the moving part assembly 4, which helps to improve the service life and vibration performance of the vibration motor.

[0029] The vibration motor of this utility model also has another embodiment, in which the mover assembly 4 further includes a weight (not shown) to increase the mass and enhance the centrifugal force of the mover assembly 4 in linear motion, thereby improving the excitation force; preferably, the weight 40 is made of thermoplastic polyester resin material, and the magnet 41, the sliding bearing 42 and the weight are integrally injection molded in the weight 40, thereby ensuring the structural strength of the mover assembly 4. The integrated structure can improve the dynamic balance performance and improve the stability of the vibration.

[0030] It should be noted that in the description of this utility model, the terms "upper", "lower", "front", "rear", "left", "horizontal direction", "vertical direction", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A linear vibration motor, characterized by, The device includes a cuboid housing with a accommodating space, a stator assembly, a mover assembly, an elastic element, and guide rods that pass through both sides of the mover assembly and are parallel to each other. The stator assembly and guide rods are fixed to the housing. The stator assembly and mover assembly are arranged vertically at intervals. The mover assembly includes a cuboid mass block and an integral mounting ring protruding from the middle of the outer wall of the long side of the mass block. The guide rods pass through the mounting ring, and the elastic elements are sleeved on the guide rods and located on both sides of the mounting ring.

2. The linear vibration motor of claim 1, wherein, The housing includes an outer shell having the accommodating space and an opening at one end, and a cover plate adapted to and fastened to the opening.

3. The linear vibration motor of claim 2, wherein, The outer casing includes a bottom wall and side walls, and the inner wall surfaces of the bottom wall and the cover plate are respectively provided with a first fixing part and a second fixing part for fixing the guide rod.

4. The linear vibration motor of claim 3, wherein, The mass block has a through mounting hole along its thickness direction.

5. The linear vibration motor of claim 4, wherein, The moving part assembly also includes a magnet, which is embedded in the mounting hole.

6. The linear vibration motor of claim 5, wherein, The mounting ring is fitted with a sliding bearing, and the guide rod passes through the sliding bearing.

7. The linear vibration motor of claim 6, wherein, One end of the elastic element abuts against the sliding bearing, and the other end abuts against the first fixing part or the second fixing part, respectively.

8. The linear vibration motor of claim 7, wherein, The elastic element is a helical spring, and the outer diameter of the helical spring is smaller than the minimum outer diameter of the mounting ring.

9. The linear vibration motor of claim 2, wherein, The stator assembly includes a coil and a flexible circuit board. The flexible circuit board includes an external power terminal and an internal power terminal. The internal power terminal is attached to the inner surface of a side wall. The external power terminal is bent from the free end of the side wall and extends out of the accommodating space before being attached to the outer surface of the side wall.

10. The linear vibration motor according to claim 6, characterized in that, The moving part assembly also includes a weight block, and the magnet, sliding bearing and weight block are integrally injection molded into the mass block.

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