A linear vibration exciter

Abstract

The application relates to the technical field of exciters, in particular to a linear vibration exciter which comprises an elastic support, the elastic support is in a gantry structure and comprises a metal plate in the middle and elastic elements connected with two ends of the metal plate; a base plate is connected with one end of the two elastic elements away from the metal plate; a coil is fixed on the base plate and faces the metal plate; a magnetic bowl is fixed on the metal plate and has an opening facing the coil, and a magnetic steel and a pole piece are further fixed in the magnetic bowl; wherein the elastic element comprises a first connecting part connected with the metal plate, a second connecting part connected with the base plate and an elastic deformation part connecting the first connecting part and the second connecting part, the first connecting part and the second connecting part are arranged in parallel, and the elastic element is made of a high polymer material with a balanced water absorption rate lower than 1%. The material of the elastic element is set as the high polymer material with low water absorption, the service life of the elastic element is prolonged, and the performance of the product is improved.

Description

Technical Field

[0001] This invention relates to the field of technology, and more particularly to a linear vibration exciter. Background Technology

[0002] As a core component of the vibration exciter, the elastic support controls the operating frequency of the exciter and determines its fatigue life. In the exciter, the elastic support plays a role in elastic recovery. Different materials of elastic supports correspond to different elastic recovery properties, affecting the response effect of the exciter. Compared with traditional metal elastic supports, elastic supports made of polymer materials have better damping effect. In the prior art, in order to solve the problem of easy aging of commonly used polymer materials such as nylon, Chinese invention patent with publication number CN116345835A disclosed an elastic support and exciter on June 27, 2023. It uses injection molding to integrally mold a metal spring frame inside the elastic support, so that the elastic support has both rigidity and damping characteristics. However, the inventors discovered that traditional polymer materials, such as nylon, are highly absorbent and easily absorb moisture from the environment and deform over time, eventually leading to peeling and affecting the product's performance. Summary of the Invention

[0003] In view of at least one of the above technical problems, the present invention provides a linear vibration exciter that employs structural improvements to enhance product performance.

[0004] According to a first aspect of the present invention, a linear vibration exciter is provided, comprising: An elastic support, the elastic support having a gantry structure, including a central metal plate and elastic elements connected to both ends of the metal plate; The substrate is connected to the end of the two elastic elements away from the metal plate; A coil is fixed on the substrate and positioned facing the metal plate; A magnetic bowl is fixed to the metal plate and its opening faces the coil. A magnet and a pole piece are also fixed inside the magnetic bowl. The elastic element includes a first connecting part connected to the metal plate, a second connecting part connected to the substrate, and an elastic deformation part connecting the first connecting part and the second connecting part. The first connecting part and the second connecting part are arranged in parallel. The elastic element is a polymer material with a balanced water absorption rate of less than 1%.

[0005] In some embodiments of the present invention, the elastic support is a one-piece molded structure.

[0006] In some embodiments of the present invention, the first connecting portion is formed to the metal plate by injection molding.

[0007] In some embodiments of the present invention, the metal plate further has a limiting portion on the edge inside the first connecting portion.

[0008] In some embodiments of the present invention, the limiting portion is a groove recessed toward the interior of the metal plate or a protrusion protruding from the edge of the metal plate.

[0009] In some embodiments of the present invention, the elastic deformation portion is composed of at least one elastic deformation unit, each of the elastic deformation units including a first elastic arm, a second elastic arm, a third elastic arm and a fourth elastic arm arranged in an X shape, the first elastic arm, the second elastic arm, the third elastic arm and the fourth elastic arm all extending inward to form an extension arm, and the free end of the extension arm is bent to form a bent portion connected to the first connecting portion, the second connecting portion or the elastic deformation unit.

[0010] In some embodiments of the present invention, the first elastic arm and the fourth elastic arm are located in the first layer, the second elastic arm and the third elastic arm are located in the second layer, the first layer and the second layer are connected in the middle, and the first elastic arm and the fourth elastic arm and the second elastic arm and the third elastic arm form the same angle.

[0011] In some embodiments of the present invention, the first elastic arm and the second elastic arm are arranged symmetrically, the third elastic arm and the fourth elastic arm are arranged symmetrically, and there is an included angle between the first elastic arm and the second elastic arm and between the third elastic arm and the fourth elastic arm.

[0012] In some embodiments of the present invention, the first layer and the second layer have an intermediate reinforcing area at the connection, and the reinforcing area has an arc-shaped structure.

[0013] In some embodiments of the present invention, the bottom of the second connecting part has a boss, and the substrate has a connecting hole that mates with the boss. The second connecting part is fixed by adhesive and / or thermal riveting, or by snap-fit ​​or expansion connection.

[0014] The beneficial effects of the present invention are as follows: The present invention sets the elastic support in a gantry shape, with a metal plate in the middle and elastic elements on both sides. Vibration is transmitted by means of the metal plate. Furthermore, by setting the material of the elastic elements to a low water absorption polymer material, the service life of the elastic elements is improved, while also reducing the phenomenon of the metal plate and polymer material peeling off due to elastic deformation in the prior art, thereby improving the performance of the product. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the linear vibration exciter in an embodiment of the present invention; Figure 2 This is a schematic diagram of the exploded disassembly structure of the linear vibration exciter in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the elastic support in an embodiment of the present invention; Figure 4 This is a cross-sectional view of the connection structure between the metal plate and the first connecting part in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the elastic element in an embodiment of the present invention; Figure 6 This is a top view of the elastic element in an embodiment of the present invention; Figure 7 This is a front view of the elastic element in an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure in which the elastic support and the base plate are connected by a snap-fit ​​mechanism in an embodiment of the present invention; Figure 9 As described in the embodiments of the present invention Figure 8 Enlarged view of section A in the image; Figure 10 This is a schematic diagram of the connection between the elastic support and the base plate expansion column in an embodiment of the present invention; Figure 11 As described in the embodiments of the present invention Figure 10 A magnified view of section B in the image. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0020] like Figures 1 to 7 The linear vibration exciter shown includes an elastic support 1, a base plate 2, a coil 3, and a magnetic cup 4, wherein: like Figure 3 As shown, the elastic support 1 has a gantry structure, including a metal plate 11 in the middle and elastic members 12 connected to both ends of the metal plate 11. It should be noted that, in this embodiment of the invention, the gantry structure means that the elastic members 12 are vertically connected to both ends of the metal plate 11 and extend in a direction away from the metal plate 11. In this embodiment of the invention, the elastic support 1 plays the role of transmitting vibration. Please continue to refer to Figure 1 and Figure 2 In this embodiment of the invention, the substrate 2 is connected to the end of the two elastic elements away from the metal plate 11. It should be noted that the substrate 2 in this embodiment can be connected separately to the outer shell, or it can be part of the outer shell. The coil 3 is fixed on the substrate 2 and faces the metal plate 11. The magnetic bowl 4 is fixed on the metal plate 11 and its opening faces the coil 3. A magnet 41 and a pole piece 42 are also fixed inside the magnetic bowl 4. In this embodiment of the invention, after the coil 3 is energized, it generates an alternating magnetic field, causing the magnet 41 in the magnetic field to reciprocate. Since the magnet 41 is fixed in the magnetic bowl 4, and the magnetic bowl 4 is fixed on the metal plate 11, the reciprocating movement of the magnet 41... The vibration of the metal plate 11 is transmitted to the elastic element 12 through the metal plate 11, and then to the substrate 2 through the elastic element 12, ultimately causing a vibration at the contact point with the substrate 2. It should be noted that the vibration of the magnet 41 is a prior art technology. As for the arrangement of the coil 3 and the magnetic cup 4, in one embodiment of the present invention, the coil 3 is inserted into the magnetic cup 4, and the outer diameter of the magnet 41 is smaller than the inner diameter of the coil 3. Through the nesting of the coil 3 and the magnet 41, that is, after the product is assembled, the coil 3 is located between the gap between the pole piece 42 and the magnetic cup 4. This arrangement can reduce the overall volume, increase the overlap of the magnetic field, and thus improve the vibration effect. Please continue to refer to Figure 3In this embodiment of the invention, the elastic element includes a first connecting portion 12a connected to the metal plate 11, a second connecting portion 12c connected to the substrate 2, and an elastic deformation portion 12b connecting the first connecting portion 12a and the second connecting portion 12c. The first connecting portion 12a and the second connecting portion 12c are arranged in parallel. The elastic element is a polymer material with a equilibrium water absorption rate of less than 1%. It should be noted that in some embodiments of the invention, the low water absorption rate polymer material can be POM (polyoxymethylene) or POK (polyketone). It should be noted that in this embodiment of the invention, the equilibrium water absorption rate of POK material is tested to be 0.5% (test standard is ASTM570 ISO62), while the equilibrium water absorption rate of nylon material such as PA66 is 2.2%. It should also be noted that in this embodiment of the invention, POK material not only has a low water absorption rate, but also has advantages such as wear resistance, good toughness, strong fatigue resistance, low elastic modulus, and good temperature resistance.

[0021] In the above embodiments, by setting the elastic support 1 as a gantry shape, with a metal plate 11 in the middle and elastic elements 12 on both sides, vibration is transmitted by means of the metal plate 11. Furthermore, by setting the material of the elastic element 12 as a low water absorption polymer material, the service life of the elastic element 12 is improved, and the phenomenon of the metal plate 11 peeling off from the polymer material caused by elastic deformation in the prior art is reduced, thereby improving the performance of the product.

[0022] Based on the above embodiments, in some embodiments of the present invention, there are various ways to connect the metal plate 11 and the elastic element in the elastic bracket 1. For example, fasteners (screws, bolts, rivets) or snap-fit ​​connections can be used. In some embodiments of the present invention, to further improve the stability and ease of manufacturing of the elastic bracket 1, the elastic bracket 1 is an integrally molded structure. In specific molding, in some embodiments of the present invention, the first connecting part 12a is used to connect the metal plate 11 with the elastic element 12 through injection molding. That is, the metal plate 11 is first surface treated and then placed in a plastic mold for injection molding to achieve the combination of the metal plate 11 and the elastic element 12. It should be noted that the present invention differs from the prior art in that the metal plate 11 in the present invention is only connected to the first connecting part 12a, such as... Figure 3 As shown in the embodiment of the present invention, since the first connecting part 12a is parallel to the third connecting part and the third connecting part is fixed on the substrate 2, the elastic deformation part 12b in the middle plays the main role of deformation and elastic recovery. With this arrangement, the joint between the metal plate 11 and the first connecting part 12a hardly deforms, thereby reducing the phenomenon of peeling between the metal plate 11 and the first connecting part 12a. Furthermore, the use of low water absorption material also reduces the impact of water absorption on product performance.

[0023] like Figure 4 As shown, to further improve the reliability of the connection between the metal plate 11 and the first connecting portion 12a, the metal plate 11 also has a limiting portion 11a on its inner edge of the first connecting portion 12a. Specifically, in this embodiment of the invention, the limiting portion 11a is a groove recessed towards the interior of the metal plate 11 or a protrusion protruding from the edge of the metal plate 11. In this embodiment of the invention, the edge refers to the edges on both sides of the metal plate 11 in the width direction. By setting it in this way, the contact area between the first connecting portion 12a and the metal plate 11 is increased, thereby improving the reliability of the connection and preventing the metal plate 11 from becoming loose from the first connecting portion 12a when it vibrates.

[0024] In this embodiment of the invention, the specific structure of the elastic deformation portion 12b is as follows: Figures 5 to 7 As shown, the elastic deformation portion 12b is composed of at least one elastic deformation unit. Each elastic deformation unit includes a first elastic arm 12b1, a second elastic arm 12b2, a third elastic arm 12b3, and a fourth elastic arm 12b4 arranged in an X-shape. The first elastic arm 12b1, the second elastic arm 12b2, the third elastic arm 12b3, and the fourth elastic arm 12b4 all extend inward to form an extension arm 12b5. The free end of the extension arm 12b5 is bent to form a bent portion 12b6 connected to the first connecting portion 12a, the second connecting portion 12c, or the elastic deformation unit. It should be noted that the X-shape here refers to the four elastic arms being connected in the middle, and does not limit the first elastic arm 12b1 and the third elastic arm 12b3 or the second elastic arm 12b2 and the fourth elastic arm 12b4 to be on the same straight line. In this embodiment of the invention, by setting the elastic element 12 as an integral structure and forming a three-dimensional structure through integral injection molding, the product has greater stability, and through... Figure 5 The addition of the extension arm 12b5 increases the length of the lever arm, reduces the resonant frequency, and thus mitigates stress concentration.

[0025] Please continue to refer to Figure 5 and Figure 6 In this embodiment of the invention, the first elastic arm 12b1 and the fourth elastic arm 12b4 are located in the first layer, and the second elastic arm 12b2 and the third elastic arm 12b3 are located in the second layer. The first layer and the second layer are connected in the middle, and the first elastic arm 12b1 and the fourth elastic arm 12b4, as well as the second elastic arm 12b2 and the third elastic arm 12b3, form the same included angle. Figure 6As shown in the embodiment of the invention, the angle between the first elastic arm 12b1 and the fourth elastic arm 12b4 is 140 degrees, and the angle between the third elastic arm 12b3 and the extension arm 12b5 is 110 degrees. The four elastic arms and their connected extension arms 12b5 are arranged symmetrically in pairs. The multiple triangular structures formed in this way greatly increase the stability of the structure.

[0026] Please continue to refer to Figure 7 In this embodiment of the invention, the first elastic arm 12b1 and the second elastic arm 12b2 are symmetrically arranged, as are the third elastic arm 12b3 and the fourth elastic arm 12b4, and there are included angles between the first elastic arm 12b1 and the second elastic arm 12b2, and between the third elastic arm 12b3 and the fourth elastic arm 12b4. With this arrangement, as... Figure 5 As shown, the first connecting part 12a elastically deforms with the first elastic arm 12b1 and the fourth elastic arm 12b4 through the bending part 12b6, while the first elastic arm 12b1 and the second elastic arm 12b2 elastically deform through the angle between them. The second elastic arm 12b2 and the second connecting part 12c elastically deform through the bending part 12b6 at the free end of the extension arm 12b5 of the second elastic arm 12b2. This staggered deformation configuration improves structural stability and reduces twisting and swaying of the elastic element 12 during vibration. To further improve structural stability, such as... Figure 5 As shown in the embodiment of the invention, the first layer and the second layer have an intermediate reinforcing region 12b7 at the connection point, and the reinforcing region has an arc-shaped structure. The reinforcement strengthens the connection between the first layer and the second layer, improving the support of the elastic member 12.

[0027] Please continue to refer to Figure 5 In this embodiment of the invention, the shape of the second connecting part 12c extends outward toward the triangular region to form a plate-like structure that forms an adhesive area, thereby ensuring the reliability of the adhesive. In this embodiment of the invention, the bottom of the second connecting part 12c has a boss 12c1, and the substrate 2 has a connecting hole 21 that mates with the boss 12c1. The second connecting part 12c is fixed by adhesive bonding and hot riveting. In specific connection, the second connecting part 12c is first bonded to the substrate 2, so that the boss 12c1 passes through the connecting hole 21. Then, the boss 12c1 is fixed to the substrate 2 by hot riveting. Through the above connection method, the bonding force between the second connecting part 12c and the substrate 2 is further improved. Of course, it should be noted that in some embodiments of the invention, the connection between the second connecting part 12c and the substrate 2 can be achieved by adhesive bonding or hot riveting alone, or by using hot riveting while bonding.

[0028] Furthermore, in this embodiment of the invention, to further enhance the bonding force between the elastic support 1 and the substrate 2, other connection structures are also provided, such as... Figure 8 and Figure 9 As shown, the boss 12c1 has been improved into a claw structure. The claws are engaged with the connecting hole 21 to achieve unfolding and fastening. It should be noted that the height of the claws can be changed during the design process to enable the substrate 2 to be engaged with other product planes at the same time. In addition, the number of claws is not limited. It can be set to a single claw structure as shown in the figure, or it can be a three-claw, four-claw, or other fastening mechanism.

[0029] In some embodiments of the present invention, an expansion column structure is also employed, such as... Figure 10 and Figure 11 As shown, the boss 12c1 is modified into an expansion column structure, with four prisms on the generatrix of the cylindrical boss 12c1. The cross-sectional area of ​​the expansion column is slightly larger than that of the connecting hole 21. Due to the structure of the four protruding prisms, the expansion column has an interference fit when passing through the connecting hole 21. Through the interference fit, the elastic support 1 and the substrate 2 are fixed. It should also be noted that in the specific design, the height of the expansion column can be adjusted to connect the elastic support 1, the substrate 2, and other product structures through interference fit. Of course, it should also be noted that the number of prisms on the expansion column can be designed as needed, such as diagonal prisms or triangular prisms, etc.

[0030] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A linear vibration exciter, characterized in that, include: An elastic support, the elastic support having a gantry structure, includes a central metal plate and elastic elements connected to both ends of the metal plate; The substrate is connected to the end of the two elastic elements away from the metal plate; A coil is fixed on the substrate and positioned facing the metal plate; A magnetic bowl is fixed to the metal plate and its opening faces the coil. A magnet and a pole piece are also fixed inside the magnetic bowl. The elastic element includes a first connecting part connected to the metal plate, a second connecting part connected to the substrate, and an elastic deformation part connecting the first connecting part and the second connecting part. The first connecting part and the second connecting part are arranged in parallel. The elastic element is a polymer material with a balanced water absorption rate of less than 1%. The elastic deformation section is composed of at least one elastic deformation unit. Each elastic deformation unit includes a first elastic arm, a second elastic arm, a third elastic arm, and a fourth elastic arm arranged in an X-shape. The first elastic arm, the second elastic arm, the third elastic arm, and the fourth elastic arm all extend inward to form an extension arm. The free end of the extension arm is bent to form a bent section that connects to the first connecting part, the second connecting part, or the elastic deformation unit.

2. The linear vibration exciter according to claim 1, characterized in that, The elastic support is a one-piece molded structure.

3. The linear vibration exciter according to claim 2, characterized in that, The first connecting part is formed by injection molding to the metal plate.

4. The linear vibration exciter according to claim 1, characterized in that, The metal plate also has a limiting part on the edge inside the first connecting part.

5. The linear vibration exciter according to claim 4, characterized in that, The limiting part is a groove that is recessed into the metal plate or a protrusion that protrudes from the edge of the metal plate.

6. The linear vibration exciter according to claim 1, characterized in that, The first elastic arm and the fourth elastic arm are located in the first layer, and the second elastic arm and the third elastic arm are located in the second layer. The first layer and the second layer are connected in the middle, and the first elastic arm and the fourth elastic arm, as well as the second elastic arm and the third elastic arm, form the same angle.

7. The linear vibration exciter according to claim 6, characterized in that, The first elastic arm and the second elastic arm are arranged symmetrically, the third elastic arm and the fourth elastic arm are arranged symmetrically, and there is an included angle between the first elastic arm and the second elastic arm and between the third elastic arm and the fourth elastic arm.

8. The linear vibration exciter according to claim 6, characterized in that, The first layer and the second layer have an intermediate reinforcement area at the connection point, and the reinforcement area has an arc surface structure.

9. The linear vibration exciter according to claim 1, characterized in that, The second connecting part has a boss at the bottom, and the substrate has a connecting hole that mates with the boss. The second connecting part is fixed by adhesive and / or thermal riveting, or by snap-fit ​​or expansion connection.

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