Fasteners, shielding units

Abstract

The present invention can achieve a sufficient cushioning effect; the present invention comprises: a support member (5) for supporting the shielding member (2), and a fixing member (50) for fixing the shielding member (2) to the structure (4) via the support member (5); the support member (5) has a cylindrical part (61), two flange parts (60, 62), and spring parts (7, 8); the spring parts (7, 8) have a first spring (7) and a second spring (8) with different load-flexure characteristics; the first spring (7) and the second spring (8) are respectively located between the two flange parts (60, 62) and the two sides of the shielding member (2); thereby, the present invention can achieve a sufficient cushioning effect.

Description

Technical Field

[0001] This invention relates to fasteners for securing shielding members to a structure. Additionally, this invention relates to shielding units comprising shielding members and fasteners. Background Technology

[0002] As a fastener for securing shielding components to a structure, there exists, for example, the fastener described in Patent Document 1. The fastener of Patent Document 1 includes a support member and bolts for securing shielding components such as heat insulators to a structure such as an exhaust manifold.

[0003] The support member has: a cylindrical body having a hole formed through it in the thermal insulator; a washer embedded in one end of the cylindrical body; a flange formed in the other end of the cylindrical body; and an elastic body fixed between the washer and the thermal insulator, and between the flange and the thermal insulator, respectively.

[0004] Bolts pass through the cylindrical body of the support component and are screwed into the predetermined fastening position of the exhaust manifold. Thus, the thermal insulator is secured to the exhaust manifold.

[0005] [Existing Technical Documents]

[0006] [Patent Documents]

[0007] Patent Document 1: Japanese Patent No. 5885258 Summary of the Invention

[0008] (The problem that the invention aims to solve)

[0009] In this fastener, it is important to suppress the transmission of vibrations from structures such as exhaust manifolds to shielding components such as thermal insulators, thereby achieving a sufficient buffering effect.

[0010] The problem to be solved by the present invention is to provide a fastener and a shielding unit that can achieve sufficient cushioning effect.

[0011] (Solution to the problem)

[0012] The fastener of the present invention is a fastener for securing a shielding member to a structure, and it has the following characteristics.

[0013] The fastener comprises: a support member for supporting the shielding member, and a fixing member for fixing the shielding member to the structure via the support member; the support member has a cylindrical portion, two flange portions, and a spring portion, the cylindrical portion being inserted into a hole in the shielding member and for the fixing member to be inserted, the two flange portions being respectively disposed at both ends of the cylindrical portion and facing two sides of the shielding member, and the spring portions being respectively located between the two flange portions and two sides of the shielding member; the spring portion has a first spring and a second spring with different load-flexure characteristics; the first spring is respectively located between the two flange portions and two sides of the shielding member; the second spring is located between at least one flange portion and at least one side of the shielding member.

[0014] In the fastener of the present invention, preferably: the cylindrical portion and the two flange portions are composed of a sleeve integrally provided with a flange portion at one end and a ring fitted into the other end of the sleeve; the first spring includes a sleeve-shaped spring integrally provided with a flange at one end and an annular spring fitted into the other end of the sleeve-shaped spring; the sleeve-shaped spring is inserted into the hole of the shielding member and fitted into the sleeve from the outside; the flange of the sleeve-shaped spring is located between one of the two flange portions and one of the two surfaces of the shielding member; the annular spring is located between the other of the two flange portions and the other of the two surfaces of the shielding member.

[0015] In the fasteners of the present invention, it is preferable that the support member has an intermediate portion located between the two sides of the shielding member and the spring portion.

[0016] In the fasteners of the present invention, preferably, the first spring is a spring made of metal wire mesh, and the second spring is a wave washer.

[0017] The shielding unit of the present invention is characterized in that it has a shielding member that transmits the influence of the shielding structure to the surrounding area and a fastener of the present invention; the shielding member is provided with a hole for inserting the cylindrical portion of the fastener.

[0018] (Invention Effects)

[0019] The fasteners and shielding units according to the present invention can achieve a sufficient buffering effect. Attached Figure Description

[0020] Figure 1 This is a usage diagram illustrating the implementation of the fasteners and shielding units involved in this invention.

[0021] Figure 2 It is a longitudinal section view showing the main part. Figure 1 (Sectional view along line II-II in the middle).

[0022] Figure 3 It is an exploded side view representing the main part (and) Figure 2 (Corresponding side view).

[0023] Figure 4 This is an explanatory diagram illustrating the attenuation characteristics.

[0024] Figure 5 This is an explanatory diagram showing the load-flexure characteristics of the spring section. Detailed Implementation

[0025] Hereinafter, an example of an embodiment (example) of the fastener and shielding unit according to the present invention will be described in detail with reference to the accompanying drawings. It should be noted that, in the accompanying drawings, since they are schematic diagrams, the main components are shown, but the illustrations of other components besides the main components are omitted. In addition, part of the shaded lines or part of the cross-sections are omitted.

[0026] (Explanation of the structure of the implementation method)

[0027] The structure of the fastener 3 and the shielding unit 1 involved in this embodiment will be described below.

[0028] (Description of Shielding Unit 1)

[0029] like Figures 1 to 3 As shown, the shielding unit 1 of this embodiment includes a shielding member (insulator, thermal insulator, etc.) 2 and a fastener 3 of this embodiment.

[0030] (Explanation of shielding component 2)

[0031] In this example, the shielding member 2 is a metal component, consisting of a metal cover member or a metal plate member, etc. The shielding member 2 is a component that shields the influence of the structure 4 from being transmitted to its surroundings. That is, the shielding member 2 protects the components, devices, and other parts around the structure 4 from the influence of the structure 4.

[0032] Structure 4 may be, for example, an exhaust manifold or the outlet pipe of a turbine. The effects of structure 4 may include, for example, heat or sound generated within structure 4. A fixing boss 40 is integrally provided as a fixing part at the location in structure 4 where the shielding member 2 is fixed. A threaded hole 41 is provided on the fixing boss 40.

[0033] A hole 20 is provided in the shielding member 2 at the location corresponding to the fixed boss 40. In this example, the hole 20 is circular. The cylindrical portion 61 of the sleeve 6 of the fastener 3 is inserted into the hole 20.

[0034] In this example, the shielding member 2 has four holes 20 and the structure 4 has four fixing bosses 40. It should be noted that the number or location of the holes 20 and fixing bosses 40 are not limited to this example.

[0035] (Explanation of fastener 3)

[0036] The fastener 3 includes a support member 5 and a bolt 50 as a fixing member. The support member 5 supports the shielding member 2. The bolt 50 fixes the shielding member 2 to the structure 4 via the support member 5.

[0037] (Explanation of support component 5)

[0038] like Figure 2 and Figure 3 As shown, the support member 5 has a sleeve 6 and a ring 60, a first spring 7 and a second spring 8 as spring parts, and two washers (disc washers) 9 as intermediate parts.

[0039] The sleeve 6 has a cylindrical portion 61 and a flange portion 62. The inner diameter of the cylindrical portion 61 is approximately the same as the inner diameter of the threaded hole 41 of the fixed boss portion 40. The cylindrical portion 61 is inserted into the hole 20 of the shielding member 2. The bolt 50 is inserted into the cylindrical portion 61.

[0040] The flange portion 62 is integrally provided at one end (lower end) of the cylindrical portion 61. On the outer peripheral surface of the other end (upper end) of the cylindrical portion 61, a circumferentially provided engagement groove 63 is provided. On the other hand, on the inner peripheral surface of the ring 60, which serves as the flange portion, a circumferentially provided engagement protrusion 64 is provided to engage with the engagement groove 63.

[0041] In this example, the first spring 7, which is part of the spring section, is a spring made of wire mesh. Additionally, in this example, the second spring 8, which is part of the spring section, is a spring made of two web washer pieces.

[0042] The result is, as Figure 5 The load-deflection (displacement) characteristics of the spring are shown in the figure. The load-deflection characteristics of the first spring 7 are shown in the figure. Figure 5 Curve A in the middle) and the load-flexure characteristics of the second spring 8 ( Figure 5 The curves B in the diagram are different from each other.

[0043] The first spring 7 includes a sleeve-shaped spring 70 and a ring spring 71. The sleeve-shaped spring 70 is cylindrical and has a flange 72 integrally provided at one end (lower end). The inner diameter of the cylindrical sleeve-shaped spring 70 is approximately equal to or slightly larger than the outer diameter of the cylindrical portion 61 of the sleeve 6.

[0044] The inner diameter of the annular spring 71 is approximately equal to or slightly smaller than the outer diameter of the other end (upper end) of the sleeve spring 70. The annular spring 71 is engaged with the other end of the sleeve spring 70.

[0045] (Explanation of the fastening process of fastening the shielding component 2 to the structure 4 using fasteners 3)

[0046] First, such as Figure 2 and Figure 3 As shown, two washers 9 are configured to abut against the two sides (upper and lower sides) of the portion of the shielding member 2 where the hole 20 is provided.

[0047] Next, the two second springs 8, which are wave washers, are configured to abut against the upper and lower washers 9 from the upper and lower sides respectively.

[0048] Next, the sleeve-shaped spring 70 of the first spring 7 is inserted from below into the through holes of the two second springs 8, the through holes of the two washers 9, and the hole 20 of the shielding member 2. The flange 72 of the sleeve-shaped spring 70 is positioned to abut against the lower second spring 8, which serves as a wave washer. Furthermore, the annular spring 71 of the first spring 7 is fitted from the outside onto the other end (upper end) of the sleeve-shaped spring 70. The annular spring 71 is positioned to abut against the upper second spring 8, which serves as a wave washer.

[0049] Then, the cylindrical portion 61 of the sleeve 6 is inserted into the sleeve-shaped spring 70 from below. The flange portion 62 of the sleeve 6 is configured to abut against the flange 72 of the sleeve-shaped spring 70 from below. Furthermore, the engaging protrusion 64 of the ring 60 is engaged from the outside into the engaging groove 63 of the sleeve 6. Thus, the support member 5 of the fastener 3 is assembled onto the shielding member 2.

[0050] At this time, the cylindrical part, i.e., the cylindrical part 61 of the sleeve 6, is inserted into the hole 20 of the shielding member 2. The two flange parts, i.e., the flange part 62 of the sleeve 6 and the ring 60 that serves as the flange part, are respectively opposite to the two sides (upper and lower sides) of the shielding member 2.

[0051] In addition, the spring portion, namely the first spring 7 and the second spring 8, are separated by two upper and lower washers 9 and are respectively located between the two sides (upper and lower sides) of the shielding member 2 and the flange portion 62 of the sleeve 6 and the ring 60 that serves as the flange portion.

[0052] Furthermore, the sleeve-shaped spring 70 of the first spring 7 is fitted into the sleeve 6, i.e. the cylindrical portion 61 of the sleeve 6, from the outside.

[0053] Furthermore, the flange 72 of the sleeve-shaped spring 70 of the first spring 7 is located between one of the two surfaces of the shielding member 2, namely the lower surface, and one of the two flange portions, namely the flange portion 62 of the sleeve 6, via the lower washer 9.

[0054] Furthermore, the annular spring 71 of the first spring 7 is located between the upper surface of the shielding member 2 and the other of the two flange portions, namely the ring 60 which serves as the flange portion, via the upper washer 9.

[0055] Furthermore, the upper and lower washers 9, which serve as the intermediate part, are located between the two sides (upper and lower sides) of the shielding member 2 and the upper and lower second springs 8, which are wave washers.

[0056] Then, as Figure 1 and Figure 2 As shown, the shielding member 2 covers the structure 4. Furthermore, the support member 5 of the fastener 3, assembled in the shielding member 2, is positioned at the fixed boss portion 40 of the structure 4. Further, the hollow portion of the cylindrical portion 61 of the support member 5 is aligned with the threaded hole 41 of the fixed boss portion 40. Then, the threaded portion of the bolt 50 of the fastener 3 is inserted into the cylindrical portion 61 and screwed into the threaded hole 41 of the fixed boss portion 40.

[0057] As a result, the support member 5 is clamped between the head of the bolt 50 and the fixing boss 40 and is fixed. Thus, the shielding member 2 is fastened to the structure 4 by the support member 5 of the fastener 3 and the bolt 50.

[0058] (Explanation of the function of the implementation method)

[0059] The fastener 3 and the shielding unit 1 involved in this embodiment are constructed according to the structure described above. Their functions will be explained below.

[0060] The shielding member 2 is fastened to the structure 4 by fasteners 3 in a manner that covers the structure 4. Thus, the shielding member 2 shields the structure 4 from heat or sound generated within it. As a result, the shielding member 2 protects the components, devices, and parts surrounding the structure 4 from the effects of heat or sound generated within it.

[0061] The fastener 3 supports the shielding member 2 via the support member 5, and the shielding member 2 is fastened to the fixing boss 40 of the structure 4 via the bolt 50, which serves as a fixing member. As a result, the fastener 3 absorbs and buffers the vibrations generated in the structure 4 by utilizing the support member 5, thereby preventing the vibrations generated in the structure 4 from being transmitted to the shielding member 2.

[0062] (Explanation of the effects of the implementation method)

[0063] The fastener 3 and the shielding unit 1 involved in this embodiment have the structure and function described above. Their effects will be explained below.

[0064] In the fastener 3 and shielding unit 1 of this embodiment, a first spring 7 and a second spring 8 with different load-flexure characteristics are located between the shielding member 2 and the structure 4. Therefore, the vibration of the structure 4 can be suppressed from being transmitted to the shielding member 2, thereby achieving a sufficient buffering effect.

[0065] Therefore, in the fastener 3 and shielding unit 1 of this embodiment, the vibration of the structure 4 can be suppressed from being transmitted to the shielding member 2 by utilizing sufficient buffering effect. Thus, damage such as cracks caused by the vibration of the structure 4 in the shielding member 2 can be reliably prevented.

[0066] Furthermore, in the fastener 3 and shielding unit 1 involved in this embodiment, there is no gap between the shielding member 2 and the first spring 7 and the second spring 8 for the purpose of blocking the transmission (input) of the vibration of the structure 4 to the shielding member 2. Therefore, it will not lead to the deterioration of acoustic vibration (noise).

[0067] The following is for reference Figure 4 The attenuation characteristics (I) of the fastener 3 and shielding unit 1 in this embodiment, the attenuation characteristics (II) of the fastener in the comparative example and the fastener in the aforementioned Patent Document 1, and the attenuation characteristics (III) of the fastener in the comparative example and the fastener disclosed in Japanese Patent No. 6038145 are compared.

[0068] The fastener in the aforementioned Patent Document 1 is a fastener in which a spring (elastic body, such as metal wire mesh) is respectively positioned between a washer and a flange and a thermal insulator. The fastener disclosed in Japanese Patent No. 6038145 is a fastener in which a leaf spring is directly abutted against a shielding member.

[0069] Figure 4 This is an explanatory diagram showing the attenuation characteristics. The vertical axis represents the transmissibility of the vibration, and the horizontal axis represents the frequency of the vibration (Hz). The region with a transmissibility below 1.0 is the attenuation region, where the vibration can be attenuated. Furthermore, as shown in attenuation characteristics (I) and (II), the point with the highest transmissibility value represents the resonant point. If the frequency (Hz) at this resonant point is low, the attenuation efficiency (i.e., the buffering effect) is good. That is, attenuation of the vibration begins at a low frequency (Hz), thus the attenuation efficiency (i.e., the buffering effect) is good.

[0070] As shown by the dotted-line curve, regarding the attenuation characteristic (III) of the fastener disclosed in Japanese Patent No. 6038145, in this example, no attenuation effect is obtained at a frequency (Hz) of approximately 220. Furthermore, as shown by the dashed-line curve, regarding the attenuation characteristic (II) of the fastener in the aforementioned Patent Document 1, at high frequencies (Hz), in this example, at approximately 125, it enters the attenuation region and obtains an attenuation effect.

[0071] On the other hand, as shown by the solid line curve, regarding the attenuation characteristics (I) of the fastener 3 and shielding unit 1 according to this embodiment, at a low (small) frequency (Hz), in this example, it enters the attenuation region at approximately 85 (Hz) and thus achieves an attenuation effect. Moreover, compared with the attenuation characteristics (II) of the fastener in the aforementioned Patent Document 1, the frequency (Hz) at the resonant point of the fastener 3 and shielding unit 1 according to this embodiment is approximately 40 (smaller) lower in this example, therefore, a sufficient attenuation effect corresponding to the difference is obtained.

[0072] Here, refer to Figure 5 The load-deflection characteristics of the spring section are explained. The load-deflection characteristics of the first spring 7, which is made of wire mesh, are shown in curve A. Furthermore, the load-deflection characteristics of the second spring 8, which is a wave washer, are shown in curve B.

[0073] The load-deflection characteristics of the fastener 3 and the spring portion of the shielding unit 1 involved in this embodiment, as shown by curve C, are obtained by combining (connecting in series) the load-deflection characteristics (curve A) of the first spring 7 made of metal wire mesh and the load-deflection characteristics (curve B) of the second spring 8, which is a wave washer.

[0074] As a result, as described above, the fastener 3 and shielding unit 1 involved in this embodiment can suppress the transmission of vibration of the structure 4 to the shielding member 2, thereby obtaining a sufficient buffering effect.

[0075] In the fastener 3 and shielding unit 1 of this embodiment, the first spring 7 of the spring portion includes a sleeve-shaped spring 70 with a flange 72 integrally provided on one end and an annular spring 71 fitted into the other end of the sleeve-shaped spring 70. The flange 72 and the annular spring 71 of the sleeve-shaped spring 70 are respectively located between the two flange portions (i.e., the flange portion 62 and the ring 60 of the sleeve 6) and the two surfaces (upper and lower surfaces) of the shielding member 2. As a result, in the fastener 3 and shielding unit 1 of this embodiment, the flange 72 and the annular spring 71 of the sleeve-shaped spring 70 of the first spring 7, together with the two upper and lower second springs 8, which are wave washers located between the two flange portions and the two surfaces of the shielding member 2, suppress the transmission of vibration of the structure 4 to the shielding member 2. Thus, according to the fastener 3 and shielding unit 1 of this embodiment, a sufficient buffering effect can be obtained.

[0076] Furthermore, in the fastener 3 and shielding unit 1 of this embodiment, the sleeve portion of the first spring 7 of the spring portion is located between the fixing boss portion 40 of the structure 4 and the head of the bolt 50, which serves as a fixing member, via the flange portion 62 and the ring 60 of the sleeve 6. As a result, in the fastener 3 and shielding unit 1 of this embodiment, the sleeve portion of the sleeve spring 70, through the flange 72 of the sleeve spring 70, the ring spring 71, and the second spring 8, reliably suppresses the transmission of vibration of the structure 4 to the shielding member 2, thereby achieving a further sufficient buffering effect.

[0077] Furthermore, in the fastener 3 and shielding unit 1 of this embodiment, the sleeve portion of the sleeve-shaped spring 70 is located between the outer surface of the sleeve portion 61 of the sleeve 6 and the inner surface of the hole 20 of the shielding member 2. Therefore, even if the shielding member 2 and the structure 4 are offset laterally (in a direction parallel to the surface of the shielding member 2), the sleeve portion of the sleeve-shaped spring 70 can prevent the outer surface of the sleeve portion 61 of the sleeve 6 from colliding with the inner surface of the hole 20 of the shielding member 2. This improves durability and prevents the generation of sound.

[0078] In the fastener 3 and shielding unit 1 of this embodiment, the upper and lower washers 9, which serve as intermediate portions, are respectively positioned between the upper and lower surfaces of the shielding member 2 and the upper and lower wave-shaped second springs 8 of the spring portion. As a result, in the fastener 3 and shielding unit 1 of this embodiment, the elastic force of the second spring 8 and the elastic force of the first spring 7 act on the shielding member 2 in a surface-contact state via the washers 9. Therefore, according to the fastener 3 and shielding unit 1 of this embodiment, since the vibration of the structure 4 can be reliably suppressed from being transmitted to the shielding member 2, a more sufficient buffering effect can be obtained.

[0079] Furthermore, in the fastener 3 and shielding unit 1 of this embodiment, the upper and lower washers 9 serving as the intermediate portion can prevent the two sides (upper and lower sides) of the shielding member 2 from colliding with the upper and lower second springs 8, which serve as wave washers in the spring portion. As a result, durability can be improved and noise generation can be prevented.

[0080] Furthermore, in the fastener 3 and shielding unit 1 of this embodiment, the outer peripheral edges of the upper and lower washers (disc washers) 9, which serve as the intermediate portion, are bent. Therefore, the bent surface of the washer 9 contacts both surfaces (upper and lower surfaces) of the shielding member 2. That is, the corner of the bent outer peripheral edge of the washer 9 will not sink into both surfaces (upper and lower surfaces) of the shielding member 2. As a result, durability can be improved.

[0081] In the fastener 3 and shielding unit 1 of this embodiment, the first spring 7 of the spring section is a spring made of metal wire mesh, and the second spring 8 of the spring section is a wave washer. As a result, in the fastener 3 and shielding unit 1 of this embodiment, the load-flexure characteristics of the first spring 7 are different from those of the second spring 8, which can reliably suppress the transmission of vibration of the structure 4 to the shielding member 2, thereby obtaining a more sufficient buffering effect.

[0082] In the fastener 3 and shielding unit 1 of this embodiment, since the first spring 7 of the spring portion is a spring made of metal wire mesh, it is suitable to manufacture a sleeve-shaped spring 70 with a flange 72 integrally provided on one end, and it is also suitable to fit the annular spring 71 into the other end of the sleeve-shaped spring 70. As a result, in the fastener 3 and shielding unit 1 of this embodiment, the sleeve-shaped spring 70 and the annular spring 71 with a flange 72 integrally provided on one end can be easily manufactured, and they can be easily assembled.

[0083] (Explanation of examples other than those implemented)

[0084] In this embodiment, an example has been described consisting of a sleeve 6, which is integrally formed by the sleeve portion 61 and the flange portion 62, and a ring 60, which serves as the flange portion. However, in this invention, the sleeve 6 can also be composed of three parts: the integrally formed sleeve portion 61 and the flange portion 62, which are the sleeve portion and the two flange portions.

[0085] In this embodiment, an example is described in which two second springs 8, which are wave-shaped washers, are respectively positioned between the flange portion 62 of the two flange portions, i.e., the sleeve portion 6, and the ring 60, which is a flange portion, and the two surfaces (upper and lower surfaces) of the shielding member 2. However, in the present invention, a second spring 8, which is a wave-shaped washer, may also be positioned between a flange portion 62 of the sleeve portion 6 or a ring 60, which is a flange portion, and one surface (upper or lower surface) of the shielding member 2.

[0086] In this embodiment, an example of a sleeve-shaped spring 70 and a ring spring 71, both of which are cylindrical in shape and have a flange 72 integrally provided at one end (lower end), is described. However, in this invention, the first spring of the spring section may also be composed of two (two pieces) flange-shaped or ring-shaped springs, or it may be composed of two (two pieces) flange-shaped or ring-shaped springs and a cylindrical spring.

[0087] In this embodiment, an example in which washer 9 is used as an intermediary is described. However, in this invention, other components besides washer 9, such as gaskets or other components, may also be used as the intermediary.

[0088] In this embodiment, springs made of wire mesh (sleeve spring 70 and ring spring 71) are used as the first spring 7. However, in this invention, other springs besides those made of wire mesh may also be used as the first spring.

[0089] In this embodiment, a wave-shaped washer is used as the second spring 8. However, in this invention, other springs besides the wave-shaped washer may also be used as the second spring.

[0090] Furthermore, the fasteners of the present invention are not limited to the embodiments described above.

[0091] (Symbol Explanation)

[0092] 1…Shielding Unit

[0093] 2…Shielding components

[0094] 20…holes

[0095] 3… Fasteners

[0096] 4…Structure

[0097] 40… Fixed boss portion

[0098] 41… Threaded hole

[0099] 5… Support components

[0100] 50… Bolts (for fixing components)

[0101] 6… Sleeve

[0102] 60… rings

[0103] 61…Cylinder section

[0104] 62…Flange

[0105] 63… Slot

[0106] 64… Engaging protrusion

[0107] 7…First Spring (Spring Section)

[0108] 70… Sleeve spring

[0109] 71… Ring spring

[0110] 72…Flange

[0111] 8…Second spring (spring section)

[0112] 9… Washers (Intermediary Department)

[0113] A… represents the load-deflection characteristic curve of the first spring.

[0114] B… represents the load-deflection characteristic curve of the second spring.

[0115] C… represents the load-deflection characteristic curve after combining the first and second springs.

[0116] (I)... represents the curve representing the attenuation characteristics of the fastener 3 according to this embodiment.

[0117] (II)...represents the decay characteristic curve of the fastener involved in the comparative example (the fastener of Patent Document 1 mentioned above), and which is a fastener using a spring.

[0118] (III)...represents the decay characteristic curve of the fastener involved in the comparative example (the fastener disclosed in Japanese Patent No. 6038145), and which is a fastener without a spring.

Claims

1. A fastener for securing a shielding member to a structure. The fastener is characterized in that... It has supporting components and fixing components. The supporting component supports the shielding member. The fixing component secures the shielding member to the structure via the supporting component; The support component has a cylindrical portion, two flange portions, and a spring portion. The cylindrical portion is inserted into the hole in the shielding member, and is also used for the insertion of the fixing component. The two flanges are respectively disposed at both ends of the cylindrical portion and face each other to the two sides of the shielding member. The spring portion is located between the two flange portions and the two sides of the shielding member; The spring section has a first spring and a second spring with different load-flexure characteristics; The first spring is located between the two flange portions and the two sides of the shielding member; The second spring is located between at least one of the flange portions and at least one side of the shielding member.

2. The fastener according to claim 1, characterized in that, The cylindrical portion and the two flange portions are composed of a sleeve integrally provided with a flange portion at one end and a ring fitted into the other end of the sleeve; The first spring includes a sleeve-shaped spring integrally provided with a flange at one end and an annular spring fitted into the other end of the sleeve-shaped spring; The sleeve-shaped spring is inserted into the hole of the shielding member and fits into the sleeve from the outside; The flange of the sleeve spring is located between one of the two flange portions and one of the two sides of the shielding member; The annular spring is located between one of the two flange portions and the other of the two sides of the shielding member.

3. The fastener according to claim 1 or 2, characterized in that, The support member has an intermediate portion located between the two sides of the shielding member and the spring portion.

4. The fastener according to claim 1 or 2, characterized in that, The first spring is a spring made of metal wire mesh; The second spring is a wave washer.

5. A shielding unit, characterized in that, have: The effects of the shielding structure are transmitted to the surrounding shielding components, and The fastener as described in any one of claims 1 to 4; The shielding member has a hole for inserting the cylindrical part of the fastener.

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