Spring assembly, linear vibration motor and electronic device

Abstract

This utility model relates to the field of vibration motor technology, and discloses a spring assembly, a linear vibration motor, and an electronic device. The spring assembly includes an elastic element and a baffle. The elastic element includes a U-shaped connecting portion, inclined elastic arms integrally disposed at the free ends on both sides of the connecting portion, and a first fixing portion and a second fixing portion respectively arranged parallel to each other at the free ends on both sides of the elastic arms. The baffle assembly includes a first baffle, a second baffle, and a third baffle. The first baffle is located inside the first fixing portion and is riveted to it. The second and third baffles are respectively located on both sides of the second fixing portion and are riveted for positioning between the second and third baffles and the second fixing portion. Riveting positioning of the elastic element and baffles replaces welding fixation, avoiding the problems of excess waste material generated by the baffles and short lifespan of the elastic element caused by automated line welding, reducing the risk of spring assembly failure, and improving vibration performance.

Description

Technical Field

[0001] This utility model relates to the field of vibration motor technology, and in particular to a spring assembly, a linear vibration motor, and an electronic device. 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] Existing linear vibratory motors include an upper housing with a accommodating cavity, a cover plate, a stator assembly, a mover assembly, and a spring assembly. The mover assembly is elastically suspended within the accommodating cavity of the upper housing by spring assemblies welded to both ends. The stator assembly is fixed to the inner surface of the cover plate. After the upper housing and cover plate are fastened together, the mover assembly and stator assembly are arranged vertically at intervals. The spring assembly includes a V-shaped elastic element and a baffle assembly. The elastic element includes fixed portions at both free ends, and the baffle assembly includes three baffles, which are welded to two fixed portions respectively. The baffles prevent stress caused by direct welding of the fixed portions of the elastic element to the mover assembly and the upper housing, and prevent deformation of the elastic element due to welding to the mover assembly and the upper housing. This ensures a more stable connection between the spring assembly and the mover assembly and the upper housing. However, with the advancement of vibratory motor assembly technology and the need to ensure yield, automated line assembly has become the main method for assembling metal parts of vibratory motors, with laser welding being the primary method. Most existing spring assemblies employ automated laser welding of elastic components and baffle assemblies to prevent deformation caused by welding the elastic components to the mover assembly and the upper shell, respectively. However, this automated welding process results in excess waste material in the baffle design, which is used for pre-fixing by automated equipment such as jigs. This waste material is then removed after the elastic components and baffle assemblies are welded and fixed, leading to a waste of raw materials and hindering cost reduction. Furthermore, the assembled spring assembly uses secondary welding to connect and fix the mover assembly, providing elastic support within the upper shell's accommodating space. However, this secondary welding generates residual stress in localized areas of the elastic component. With the reciprocating motion of the mover assembly, this residual stress, combined with the dynamic stress of the vibration load, may induce cyclic creep, causing irreversible plastic deformation of the elastic component during rebound. This accelerates fatigue, reduces rebound accuracy and service life, increases the risk of elastic component failure, and affects vibration performance.

[0004] Therefore, in view of the above-mentioned shortcomings, this utility model is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a spring assembly, a linear vibration motor, and an electronic device to solve the problems in the prior art where the elastic element and the baffle assembly generate excess waste material and have a short lifespan due to laser welding.

[0006] The first aspect of this utility model provides a spring assembly, including an elastic element and a baffle assembly. The elastic element is V-shaped and includes a U-shaped connecting portion, inclined elastic arms integrally disposed on both free ends of the connecting portion, and a first fixing portion and a second fixing portion arranged parallel to each other on both free ends of the elastic arms. The baffle assembly includes a first baffle, a second baffle, and a third baffle. The first baffle is located inside the first fixing portion and is riveted to it for positioning. The second baffle and the third baffle are located on both sides of the second fixing portion and are riveted to each other for positioning.

[0007] Preferably, the first baffle has at least one first protrusion, and the first fixing part has a first through hole corresponding to the first protrusion. The first protrusion is riveted and positioned after being adapted to the first through hole. The second baffle is located inside the second fixing part, and the third baffle is located outside the second fixing part. The third baffle has at least one second protrusion, and the second fixing part and the second baffle have a second through hole and a third through hole corresponding to the second protrusion, respectively. The second protrusion is riveted and positioned after being adapted to the second through hole and the third through hole.

[0008] Furthermore, the first convex portion and the second convex portion are configured as convex hulls.

[0009] Furthermore, the first and second protrusions are provided as annular protrusions.

[0010] Furthermore, the first protrusion and the second protrusion are respectively protruding into the same side surface of the first baffle and the third baffle; the first protrusion and the second protrusion are integrally stamped with the first baffle and the third baffle respectively.

[0011] Preferably, the two sides of the first fixing part are provided with a third arc-shaped protrusion in the same direction, and the two sides of the second fixing part are provided with a fourth protrusion and a fifth protrusion in opposite directions, respectively; the two sides of the first baffle are provided with a first notch corresponding to the third protrusion, one side of the second baffle is provided with a second notch corresponding to the fourth protrusion, and the other side of the third baffle is provided with a third notch corresponding to the fifth protrusion.

[0012] Furthermore, the third protrusion is riveted to the first notch for positioning, the fourth protrusion is riveted to the second notch for positioning, and the fifth protrusion is riveted to the third notch for positioning; the third protrusion, the fourth protrusion, and the fifth protrusion are integrally stamped with the first fixing part and the second fixing part, respectively.

[0013] A second aspect of this invention provides a linear vibration motor, including the aforementioned spring assembly.

[0014] The third aspect of this utility model provides an electronic device, including the aforementioned linear vibration motor.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: by replacing the welding positioning between the elastic element and the baffle assembly before the spring assembly is welded and fixed in the prior art with the riveting positioning between the fixing part and the baffle, the baffle will not generate waste material, saving the production cost of the vibration motor. At the same time, it solves the problem of residual stress superimposed in the local area of ​​the elastic element caused by the secondary welding of the spring assembly to be welded and fixed to the linear vibration motor again, reducing the risk of irreversible plastic deformation of the elastic element during the rebound process, ensuring the rebound accuracy and service life of the elastic element, reducing the failure risk of the elastic element, and thus ensuring vibration performance. Attached Figure Description

[0016] Figure 1 This is a perspective view of the spring assembly of the first embodiment.

[0017] Figure 2 This is an exploded view of the spring assembly in the first embodiment.

[0018] Figure 3 This is a cross-sectional view of the spring assembly after riveting and positioning in the second embodiment.

[0019] Figure 4 This is an exploded view of the spring assembly in the third embodiment.

[0020] Figure 5 This is a perspective view of the elastic element in the third embodiment.

[0021] Figure 6 This is a three-dimensional view of the spring assembly after riveting and positioning in the third embodiment.

[0022] in:

[0023] 100-Spring assembly; 1-Elastic element; 10-Connecting part; 11-Elastic arm; 12-First fixing part; 13-Second fixing part; 120-First through hole; 121-Third protrusion; 130-Second through hole; 131-Fourth protrusion; 132-Fifth protrusion; 2-Baffle assembly; 20-First baffle; 200-First protrusion; 201-First notch; 21-Second baffle; 210-Third through hole; 211-Second notch; 22-Third baffle; 220-Second protrusion; 221-Third notch. Detailed Implementation

[0024] 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.

[0025] The first aspect of this utility model provides a spring assembly 100, which is applied inside a linear vibration motor (not shown). The spring assembly 100 is welded and fixed inside the linear vibration motor and is used for elastic support and reset of internal components of the vibration motor.

[0026] The first embodiment of this utility model is a spring assembly 100, such as... Figure 1 and Figure 2As shown, it includes an elastic element 1 and a baffle assembly 2. The elastic element 1 is generally V-shaped, including a U-shaped connecting part 10, inclined elastic arms 11 integrally provided on both free ends of the connecting part 10, and a first fixing part 12 and a second fixing part 13 respectively arranged parallel to each other on both free ends of the elastic arms 11; the baffle assembly 2 includes a first baffle 20, a second baffle 21, and a third baffle 22; to avoid stress and deformation caused by direct welding of the elastic element 1 to the vibration motor, which would affect the service life of the elastic element 1, and also to reinforce the fixed end of the elastic element 1, the welded fixed end of the elastic element 1... A baffle is added to form a spring assembly 1, which is then welded and fixed to the linear vibration motor to ensure the reliability and vibration performance of the linear vibration motor. However, before the spring assembly 1 is welded to the inside of the motor, the elastic element 1 and the baffle assembly 2 must be connected to achieve pre-positioning and mutual locking. Therefore, the first baffle 20 is placed inside the first fixing part 12 and riveted to it for positioning. The second baffle 21 and the third baffle 22 are located on the upper and lower sides of the second fixing part 13, respectively, and the third baffle 22 is riveted to the second baffle 21 and the second fixing part 13 for positioning. Specifically, the first baffle 20 has at least one first protrusion 200, and the first fixing part 12 has a first through hole 120 corresponding to the first protrusion 200. After the first protrusion 200 and the first through hole 120 are adapted, they are riveted and positioned. The second baffle 21 is located inside the second fixing part 13, and the third baffle 22 is located outside the second fixing part 13. The third baffle 22 has at least one second protrusion 220. The second fixing part 13 and the second baffle 21 have a second through hole 130 and a third through hole 210 corresponding to the second protrusion 220, respectively. After the second protrusion 220 is adapted to the second through hole 130 and the third through hole 210, they are riveted and positioned, thereby locking the fixing part of the elastic member 1 and the baffle, which facilitates the welding and fixing between the spring assembly 100 and the vibration motor. In this embodiment, the first protrusion 200 and the second protrusion 220 are provided as protrusions, wherein the first protrusion 200 and the second protrusion 220 are respectively protruding on the same side surface of the first baffle 20 and the third baffle 22, and the first protrusion 200 and the second protrusion 220 are integrally stamped with the first baffle 20 and the third baffle 22.

[0027] The second embodiment of this utility model includes a spring assembly 100, such as... Figure 3 As shown, this is an alternative to the first embodiment. The first protrusion 200 and the second protrusion 220 are set as annular protrusions. When the baffle is riveted to the fixing part, compared with the ordinary protrusion design, the annular protrusion structure can distribute the force over a larger range, reduce the risk of material deformation, and ensure the stability of the connection.

[0028] The third embodiment of the utility model is a spring assembly 100, such as... Figures 4 to 6As shown, the first fixing part 12 has arc-shaped annular third protrusions 121 protruding in the same direction on both sides of its two sides, and the second fixing part 13 has arc-shaped annular fourth protrusions 131 and fifth protrusions 132 protruding in opposite directions on both sides of its two sides; the first baffle 20 has a first notch 201 on both sides of its two sides corresponding to the shape of the third protrusion 121, the second baffle 21 has a second notch 211 on one side of its two sides corresponding to the shape of the fourth protrusion 131, and the third baffle 22 has a third notch 221 on the other side of its two sides corresponding to the shape of the fifth protrusion 132. The third protrusion 121 is integrally stamped with the first fixing part 12, the fourth protrusion 131 and the fifth protrusion 132 are integrally stamped with the second fixing part 13. The third protrusion 121 is riveted to the first notch 201 on both sides of the first baffle 20 for positioning, the fourth protrusion 131 is riveted to the second notch on one side of the second baffle 21 for positioning, and the fifth protrusion 132 is riveted to the third notch 221 on one side of the third baffle 22 for positioning. This achieves the pre-positioning and mutual locking of the elastic element 1 and the baffle assembly 2 before the spring assembly 100 is welded and fixed to the linear vibration motor.

[0029] The riveting positioning between the fixed part of the elastic element 1 and the baffle assembly 2 replaces the welding positioning between the elastic element and the baffle assembly before the spring assembly is welded and fixed in the prior art. This eliminates the welding process of the baffle on the automated line, so that the baffle does not need to have a part for clamping by the automated fixture that is specially designed for welding. After welding, there is no need to cut off the part of the baffle that is clamped by the automated fixture to form the spring assembly. Therefore, no waste is generated, saving the production cost of the vibration motor. At the same time, it solves the problem of residual stress superimposed in the local area of ​​the elastic element caused by secondary welding of the spring assembly, reduces the risk of irreversible plastic deformation of the elastic element 1 during the rebound process, ensures the rebound accuracy and service life of the elastic element 1, reduces the failure risk of the elastic element 1, and thus ensures vibration performance.

[0030] The second aspect of this utility model provides a linear vibration motor, including a cuboid housing (not shown) with a accommodating space, a mover assembly (not shown), a stator assembly (not shown), and a spring assembly 100 as described in any one of the above. The stator assembly is fixed to the inner surface of one side of the housing, and the mover assembly is welded and fixed to the housing by the spring assembly 100 and suspended in the accommodating space. The mover assembly and the stator assembly are arranged parallel to each other vertically and spaced apart. When the stator assembly is energized, it generates a magnetic field with the mover assembly, thereby driving the mover assembly to reciprocate and return to its original position by the elastic force of the elastic element. Since the linear vibration motor has the aforementioned spring assembly 100, it necessarily has the beneficial effects of the aforementioned spring assembly 100, ensuring the vibration performance and more stable vibration of the linear vibration motor.

[0031] The third aspect of this utility model provides an electronic device (not shown) including a linear vibration motor. Since the electronic device possesses the linear vibration motor of all the above embodiments, it inevitably has the beneficial effects of the aforementioned linear vibration motor, allowing consumers to experience a higher quality and more stable vibration.

[0032] In this invention, the internal spatial structure of the linear vibration motor causes a length difference between its two fixed ends when assembled with the spring assembly 100. The length of the first fixed part 12 is greater than the length of the second fixed part 13. The longer first fixed part 12 is welded to the housing, while the shorter second fixed part 13 is welded to the mover assembly. This allows the linear vibration motor to balance its assembly deviation by using an asymmetrical preload generated by the unequal length design of the first fixed part 12 and the second fixed part 13, thus preventing vibration imbalance. Specifically, the elastic element 1 located on one side of the mover assembly typically bears a higher electromagnetic driving force. The shorter second fixed part 13 can enhance local rigidity, concentrate elastic deformation, and reduce the risk of deformation in the vertical direction, while the longer first fixed part 12 disperses stress and avoids fatigue fracture. Thus, the first fixed part 12 and the second fixed part 13 form an asymmetrical resonant system. By adjusting the length ratio, the resonance point of the working frequency band can be avoided, thereby improving the stability of the linear vibration motor.

[0033] 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.

[0034] 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 spring assembly, comprising an elastic element and a stop assembly, characterized in that, The elastic element is V-shaped in general, including a U-shaped connecting part, an inclined elastic arm integrally provided on both free ends of the connecting part, and a first fixing part and a second fixing part arranged in parallel on both free ends of the elastic arm. The baffle assembly includes a first baffle, a second baffle and a third baffle. The first baffle is located inside the first fixing part and is riveted to it for positioning. The second baffle and the third baffle are located on both sides of the second fixing part and are riveted to each other for positioning.

2. The spring assembly according to claim 1, characterized in that, The first baffle has at least one first protrusion, and the first fixing part has a first through hole corresponding to the first protrusion. The first protrusion is riveted and positioned after being adapted to the first through hole. The second baffle is located inside the second fixing part, and the third baffle is located outside the second fixing part. The third baffle has at least one second protrusion, and the second fixing part and the second baffle have a second through hole and a third through hole corresponding to the second protrusion, respectively. The second protrusion is riveted and positioned after being adapted to the second through hole and the third through hole.

3. The spring assembly according to claim 2, characterized in that, The first and second protrusions are configured as convex hulls.

4. The spring assembly according to claim 2, characterized in that, The first and second protrusions are provided as annular protrusions.

5. The spring assembly according to claim 3 or 4, characterized in that, The first protrusion and the second protrusion are respectively protruding into the same side surface of the first baffle and the third baffle; the first protrusion and the second protrusion are integrally stamped with the first baffle and the third baffle.

6. The spring assembly according to claim 1, characterized in that, The first fixing part has a third arc-shaped protrusion on both sides of its two sides, and the second fixing part has a fourth protrusion and a fifth protrusion on both sides of its two sides, respectively. The first baffle has a first notch on both sides of its two sides corresponding to the third protrusion, the second baffle has a second notch on one side of its two sides corresponding to the fourth protrusion, and the third baffle has a third notch on the other side of its two sides corresponding to the fifth protrusion.

7. The spring assembly according to claim 6, characterized in that, The third protrusion is riveted to the first notch for positioning, the fourth protrusion is riveted to the second notch for positioning, and the fifth protrusion is riveted to the third notch for positioning; the third protrusion, the fourth protrusion, and the fifth protrusion are integrally stamped with the first fixing part and the second fixing part, respectively.

8. A linear vibration motor, characterized in that, Includes the spring assembly as described in any one of claims 1-4, 6 and 7.

9. An electronic device, characterized in that, Including the linear vibration motor as described in claim 8.

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