Linear elastic sheet

Abstract

The utility model belongs to the field of linear motors, and particularly relates to a linear elastic sheet, which comprises two elastic arms which are symmetrically distributed, a U-shaped bending part is arranged between the two elastic arms, two welding parts are arranged at the tail parts of the two elastic arms, and the two elastic arms are provided with two connecting arms connected between the bending part and the two welding parts. The distance between the two connecting arms is gradually increased from the bending part to the welding part; the bending part adopts the U-shaped structure design and the two connecting arms adopt the conical structure design, so that the length of the elastic arm of the linear elastic sheet is effectively increased in the limited space of the linear motor, the rigidity of the elastic arm of the linear elastic sheet is effectively reduced, the situation that the stiffness coefficient and the hardness of the linear elastic sheet are too large is avoided, and the service life of the linear elastic sheet is prolonged. The vibration strength of the linear motor can be effectively enhanced, the energy consumption is reduced, the working reliability is improved, and the service life of the linear motor is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to linear motor technical field, concretely relates to a linear spring piece for linear motor. BACKGROUND

[0002] Linear motor is a kind of electric device that directly converts electric energy into linear motion mechanical energy without any intermediate conversion mechanism (such as gear, screw). Linear motor is mainly used in mobile phone, tablet computer, wearable device and other communication terminals, gamepad, toys and other devices, and is widely welcomed due to fast response speed, high vibration, small size, easy installation and other advantages. Linear motor includes shell, vibration system and stator system arranged in the shell, wherein the vibration system is composed of mass block, permanent magnet and linear spring piece.

[0003] The stiffness coefficient of the existing linear spring piece used in linear motor is too large, and the hardness of the linear spring piece is too high, which leads to the decrease of vibration intensity of linear motor and the increase of energy consumption. During frequent deformation, stress is concentrated at the fixed point or bending point, and long-term fatigue may cause the linear spring piece to break, greatly affecting the working reliability and service life of linear motor. SUMMARY

[0004] The utility model discloses a linear spring piece, which can effectively enhance the vibration intensity of linear motor and reduce energy consumption, and is beneficial to improve the working reliability and prolong the service life of linear motor.

[0005] To achieve the above object, the utility model adopts the following technical scheme: a linear spring piece includes two symmetrical elastic arms, a U-shaped bending part is arranged between the two elastic arms, the two elastic arms have two welding parts on the tail part, the two elastic arms have two connecting arms connected between the bending part and the two welding parts, and the distance between the two connecting arms gradually increases from the bending part to the welding part.

[0006] In some embodiments, the tail part of the two connecting arms has two support parts distributed in parallel, and the two support parts are connected between the two connecting arms and the two welding parts.

[0007] In some embodiments, the two connecting arms are respectively provided with arc-shaped grooves on both sides.

[0008] In some embodiments, the arc-shaped grooves extend from the support part to the bending part.

[0009] In some embodiments, each support part and welding part is respectively provided with a pressing groove on both sides of the connection, and the pressing groove is distributed along the width direction of the support part.

[0010] In some embodiments, the connecting end of the welding part is provided with a slot on both sides of the corresponding pressing groove, and the width of the connecting end of the welding part is smaller than the width of the supporting part.

[0011] In some embodiments, the supporting part is provided with a circular arc slot at the tail end of the supporting part and connected to both ends of the pressing groove.

[0012] In some embodiments, the welding part is provided with a semicircular slot on both sides of the welding end.

[0013] In some embodiments, the welding end of the welding part is provided with a cutting arm connected to the material belt between the semicircular slot and the slot.

[0014] The beneficial effects of the utility model are as follows: the U-shaped structure design of the bending part and the tapered structure design of the two connecting arms effectively increase the length of the elastic arm of the linear spring in the limited space of the linear motor, thereby effectively reducing the stiffness of the elastic arm of the linear spring, avoiding the excessively large stiffness coefficient and high hardness of the linear spring, effectively enhancing the vibration intensity of the linear motor and reducing energy consumption, and being beneficial to improving the working reliability and prolonging the service life of the linear motor. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings obtained according to these drawings without creative labor still belong to the scope of the utility model.

[0016] Figure 1 It is a perspective view of the embodiment of the utility model;

[0017] Figure 2 It is a top view structure diagram of the embodiment of the utility model;

[0018] Figure 3 It is a front view structure diagram of the elastic arm of the embodiment of the utility model. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects of the utility model to be solved more clearly, the utility model will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and not to limit the utility model.

[0020] 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 application belongs; the meaning and definition of the terms used herein are therefore intended to be controlled by such terminology. The terminology used in the present description is for the purpose of describing specific embodiments only and is not intended to be limiting of the present application. The use of the terms "including," "comprising," or "having" and variations thereof herein is intended to be broad and encompass the terms "consisting of" and "consisting essentially of," and variations thereof. Thus, for example, a composition, method, or apparatus that comprises or has a component is not necessarily limited to only those embodiments which consist of or consist essentially of the named component.

[0021] The terms "first", "second", "third", "upper", "lower", "front", "back", "left", "right", "inner", "outer", "top", "bottom", "side", and the like as used herein are used for convenience and do not necessarily have a structural or positional meaning.

[0022] The present application will be further described with reference to the drawings and specific embodiments:

[0023] As shown in Figure 1 , 2 , a linear spring includes two symmetrical elastic arms 1, a U-shaped bending portion 2 is arranged between the two elastic arms 1, two welding portions 3 are arranged on the tail portions of the two elastic arms, the two elastic arms 1 have two connecting arms 4 connected between the bending portion 2 and the two welding portions 3, and the spacing between the two connecting arms 4 gradually increases from the bending portion 2 to the welding portions 3.

[0024] As shown in Figure 2 , the tail portions of the two connecting arms 4 have two support portions 5 arranged in parallel, and the two support portions 5 are connected between the two connecting arms 4 and the two welding portions 3. The support portions can play the role of stress buffering and gradient transition, and the elastic deformation of the support portions can absorb and disperse a part of the stress from the bending portion, thereby avoiding the direct impact of the stress on the rigidly fixed welding portion, thereby effectively improving the fatigue life.

[0025] As shown in Figure 1 and 3As shown in the drawings, the two connecting arms 4 are respectively provided with arc-shaped grooves 41 on both sides. The arc-shaped grooves 41 extend from the support part 5 to the bending part 2. The arc-shaped grooves can play a stress release role, optimize stress distribution, avoid stress concentration, and thus improve the fatigue resistance and service life of the elastic arm. The connecting part of each support part 5 and the welding part 3 is respectively provided with a pressing groove 51 on both sides, and the pressing groove 51 is distributed along the width direction of the support part 5. The pressing groove can effectively release and redistribute residual stress, and can effectively improve the fatigue life and reliability of the spring sheet. The tail of the support part 5 is provided with a circular arc-shaped slot 52 which is transitionally connected to both ends of the pressing groove 51. The circular arc-shaped slot is provided at both ends of the pressing groove, and the circular arc-shaped slot can avoid stress concentration and prevent linear spring sheet fracture caused by stress concentration, thereby prolonging the service life of the linear spring sheet. The connecting end 31 of the welding part 3 is respectively provided with a slot 32 on both sides corresponding to the pressing groove 51, and the width of the connecting end 31 of the welding part 3 is smaller than the width of the support part 5. The slot is provided on the welding part, and the slot can reduce the width of the welding part, thereby facilitating the reduction of the stiffness of the linear spring sheet, avoiding the excessive stiffness coefficient of the linear spring sheet, and thus effectively enhancing the vibration strength of the linear motor and reducing energy consumption. The welding end 33 of the welding part 3 is symmetrically provided with a semicircular slot 34 on both sides. The semicircular slot is provided on the welding part, and the semicircular slot can play a stress release and elimination role. During welding, the semicircular slot will elastically deform (slightly bent or stretched), thereby effectively absorbing and dispersing the stress, preventing it from being concentrated on the fragile welding point, and thus improving the connection reliability of the linear spring sheet.

[0026] As shown in the drawings, Figure 1 The welding end 33 of the welding part 3 is formed with a cutting arm 35 connected to the material belt 6 between the semicircular slot 34 and the slot 32. By connecting the cutting arm to the material belt, the cutting arm can be reliably cut during stamping and cutting, thereby improving the stamping and cutting efficiency of the linear spring sheet.

[0027] The bending part adopts a U-shaped structure design, and the two connecting arms are bent and formed. The two connecting arms adopt a tapered structure design, effectively increasing the length of the elastic arm of the linear spring sheet in the limited space of the linear motor, thereby effectively reducing the stiffness of the elastic arm of the linear spring sheet, avoiding excessive stiffness coefficient and high hardness of the linear spring sheet, effectively enhancing the vibration strength of the linear motor and reducing energy consumption, and improving the working reliability and prolonging the service life of the linear motor.

[0028] The above is only one embodiment of the present application, and is not intended to limit the protection scope of the present application; the protection scope of the present application is defined by the claims in the claims, and any equivalent changes and modifications made according to the present application are within the protection scope of the present application.

Claims

1. A linear spring characterized by: The two elastic arms are symmetrically distributed, and a bending part in U shape is arranged between the two elastic arms, the two elastic arms have two welding parts at the tail thereof, the two elastic arms have two connecting arms connected between the bending part and the two welding parts, and the interval of the two connecting arms gradually increases from the bending part to the welding parts.

2. The linear spring of claim 1, wherein: The tail of the two connecting arms has two support parts in parallel distribution, and the two support parts are connected between the two connecting arms and the two welding parts.

3. The linear spring of claim 2, wherein: Arc-shaped grooves are arranged on the two sides of the two connecting arms.

4. The linear spring of claim 3, wherein: The arc-shaped grooves extend from the support parts to the bending part.

5. A linear spring according to claim 2 or 3 or 4, wherein: Pressing grooves are arranged on the two sides of the connection between each support part and the welding part.

6. The linear spring of claim 5, wherein: A circular-arc-shaped slot is arranged on the tail of the support part and is transitionally connected with the two ends of the pressing groove.

7. The linear spring of claim 5, wherein: Slots are arranged on the two sides of the connecting end of the welding part corresponding to the pressing grooves.

8. The linear spring of claim 7, wherein: Half-circular slots are symmetrically arranged on the two sides of the welding end of the welding part.

9. The linear spring of claim 8, wherein: Cutting arms connected with the material belt are formed between the half-circular slots and the slots on the welding end of the welding part.

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