High-elasticity deformable wear-resistant anti-impact vehicle skylight clamping structure

Abstract

The invention provides a high-elasticity deformable wear-resistant anti-impact vehicle skylight clamping structure which comprises a skylight guide rail clamping connector, and a skylight guide rail clamping groove is formed in the side portion of the skylight guide rail clamping connector. A plurality of skylight guide rail clamping through grooves used for binding rolling belts are formed in the front sides of the skylight guide rail clamping connectors and the skylight guide rail clamping grooves; according to the skylight clamping structure, rubber, metal rubber and foam memory alloy serve as a supporting frame of the clamping structure, metal reinforcing ribs are embedded in a rubber body, the strength, rigidity and flexibility of the clamping structure are remarkably improved, the rubber body is reinforced through carbon fibers and double-component sound-absorbing cotton, and the service life of the clamping structure is prolonged. And vibration generated during movement of the skylight is absorbed through the instantaneous anti-buffering damping colloid of the non-Newtonian fluid, the hose is prevented from falling off from the clamping structure, the firmness degree of the clamping structure is improved, the inner and outer anti-corrosion protection layers are arranged, the internal structure of the clamping structure is prevented from being damaged, the stability of the clamping structure is improved, and the service life of the clamping structure is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of sunroof clamping, and in particular to a highly elastic, deformable, wear-resistant and impact-resistant vehicle sunroof clamping structure. Background Art

[0002] The car sunroof is installed on the roof, which can effectively circulate air in the car and increase the intake of fresh air. At the same time, the car sunroof can also broaden the field of vision and meet the needs of mobile photography and video shooting. The car sunroof can be roughly divided into: sliding type, built-in type, built-in and flip-out type, panoramic type and curtain type, etc. It is mainly installed on commercial SUVs, sedans and other models.

[0003] The hose on the car sunroof is usually connected to the rail of the car sunroof with a hose clip. The hose clip generally has a connection end connected to the sunroof rail, and the other end is a pipe clamp for clamping the outer surface of the hose. The connection end is two clips with a certain elasticity. During assembly, the clips at the connection end are clamped on the edge of the sunroof rail. The tip of the clip is formed with a barb structure opposite to the insertion direction. The connection end is connected to the sunroof rail by relying on the clamping force of the clip and the bite rail surface of the barb. This connection structure makes the hose clip easy to fall off due to insufficient restriction. Especially in the transportation link, the hose clip cannot 100% guarantee that the clip and the corresponding hose are in the theoretical design position, causing assembly troubles for customers (OEMs).

[0004] The general sunroof hose clamping structure only uses a rolled strip for bundling, or only one end is clamped on the sunroof rail. The hose is not firmly fixed. When the sunroof rail vibrates instantly, the hose can be easily shaken off. The hose needs to be clamped first and then fixed in various ways. Summary of the invention

[0005] In view of the deficiencies in the above-mentioned prior art, the present invention mainly aims to provide a highly elastic, deformable, wear-resistant and impact-resistant vehicle sunroof clip-on structure. The sunroof clip-on structure uses rubber, metal rubber and foam memory alloy as the supporting frame of the clip-on structure, and embeds metal reinforcement ribs in the rubber body, which significantly improves the strength and flexibility of the clip-on structure. The rubber body is reinforced by carbon fiber and two-component sound-absorbing cotton, and the vibration generated during the movement of the sunroof is absorbed by the instantaneous anti-buffering and shock-absorbing colloid of the non-Newtonian fluid, which effectively prevents the hose from falling off from the clip-on structure and greatly improves the firmness of the clip-on structure. By setting an inner and outer double-layer anti-corrosion protective layer, the internal structure of the clip-on structure is effectively prevented from being damaged by various damages, thereby improving the stability and service life of the clip-on structure.

[0006] To achieve the purpose of the present invention, the technical solution adopted is:

[0007] A highly elastic, deformable, wear-resistant and impact-resistant vehicle sunroof clamping structure, the sunroof clamping structure includes a sunroof guide rail clamping joint, a sunroof guide rail clamping slot is arranged on the side of the sunroof guide rail clamping joint, a plurality of sunroof guide rail clamping through slots for binding rolling strips are arranged on the front side of the sunroof guide rail clamping joint and the sunroof guide rail clamping slot; the sunroof guide rail clamping joint includes a clamping joint rubber support body, the internal wrapping of the clamping joint rubber support body is provided with a metal rubber support body, the internal wrapping of the metal rubber support body is provided with an anti-corrosion protection inner layer, and the internal wrapping of the anti-corrosion protection inner layer is provided with an instantaneous anti-buffering and shock-absorbing layer.

[0008] As a preferred technical solution, the instantaneous anti-buffering and shock-absorbing layer includes the following components in weight percentage: 10-15% chitosan quaternary ammonium salt modified concentrated latex, 15-40% polyacrylamide resin liquid, 5-30% Fe(OH)3 colloid, 5-25% nano-ferromagnetic matrix modified gelatin, 5-15% chitosan quaternary ammonium salt modified concentrated latex, 5-10% artificial plasma, and 10-30% magnetic powder.

[0009] As an optimal technical solution, the sunroof guide rail snap-in joint, the sunroof guide rail snap-in slot and the sunroof guide rail snap-in through slot are all arranged on the sunroof guide rail, and the sunroof guide rail snap-in joint, the sunroof guide rail snap-in slot and the sunroof guide rail snap-in through slot are snap-installed with a sunroof hose.

[0010] As a preferred technical solution, the outer surface of the rubber support body of the snap-in joint is wrapped with a woven nylon carbon fiber layer, and the outer surface of the woven nylon carbon fiber layer is wrapped with a foam memory alloy mesh layer.

[0011] As a preferred technical solution, the outer surface of the foam memory alloy mesh layer is wrapped with an anti-corrosion protective outer layer, and the interior of the snap-in joint rubber support body is provided with a circular fillable buffer cavity, a strip fillable buffer cavity and an elliptical fillable buffer cavity.

[0012] As a preferred technical solution, the strip-shaped fillable buffer cavity is filled with an instantaneous anti-buffering shock-absorbing glue made of the same material as the instantaneous anti-buffering shock-absorbing layer, and the elliptical fillable buffer cavity is filled with a two-component sound-absorbing cotton layer.

[0013] As a preferred technical solution, the skylight guide rail snap-in slot is flush with the skylight guide rail snap-in through slot, and the height of the skylight guide rail snap-in joint relative to the skylight guide rail is higher than the skylight guide rail snap-in slot or the skylight guide rail snap-in through slot.

[0014] As a preferred technical solution, the sunroof guide rail clamping joint is provided with a sunroof guide rail clamping key which is integrally connected to the sunroof guide rail clamping joint, and the sunroof guide rail clamping key is distributed in an arc shape on the sunroof guide rail clamping joint.

[0015] As a preferred technical solution, the thickness of the rubber support body of the snap-in joint is greater than or equal to the thickness of the instantaneous anti-buffering and shock-absorbing layer, and the thickness of the instantaneous anti-buffering and shock-absorbing layer is greater than or equal to the thickness of the metal rubber support body.

[0016] As a preferred technical solution, the thickness of the metal rubber support body is greater than or equal to the thickness of the foam memory alloy mesh layer, and the thickness of the foam memory alloy mesh layer is greater than or equal to the thickness of the woven nylon carbon fiber layer.

[0017] As a preferred technical solution, the thickness of the braided nylon carbon fiber layer is greater than or equal to the thickness of the anti-corrosion protection inner layer, and the thickness of the anti-corrosion protection inner layer is the same as the thickness of the anti-corrosion protection outer layer.

[0018] The present invention provides a highly elastic, deformable, wear-resistant and impact-resistant vehicle sunroof clamping structure, which has the following advantages:

[0019] The skylight clip-on structure of the present invention adopts rubber, metal rubber and foam memory alloy as the supporting frame of the clip-on structure, and embeds metal reinforcing ribs in the rubber body, which significantly improves the strength and flexibility of the clip-on structure. The rubber body is reinforced by carbon fiber and two-component sound-absorbing cotton, and the instantaneous anti-buffering and shock-absorbing colloid of the non-Newtonian fluid absorbs the vibration generated when the skylight moves, effectively preventing the hose from falling off the clip-on structure, greatly improving the firmness of the clip-on structure, and by setting an inner and outer double-layer anti-corrosion protective layer, the internal structure of the clip-on structure is effectively prevented from being damaged by various damages, thereby improving the stability and service life of the clip-on structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the installation position structure of the highly elastic deformable wear-resistant and impact-resistant vehicle sunroof clamping structure of the present invention. Figure 1 .

[0021] Figure 2 This is a schematic diagram of the installation position structure of the highly elastic deformable wear-resistant and impact-resistant vehicle sunroof clamping structure of the present invention. Figure 2 .

[0022] Figure 3 This is a schematic diagram of the installation position structure of the highly elastic deformable wear-resistant and impact-resistant vehicle sunroof clamping structure of the present invention. Figure 3 .

[0023] Figure 4 This is a schematic diagram of the installation position structure of the highly elastic deformable wear-resistant and impact-resistant vehicle sunroof clamping structure of the present invention. Figure 4 .

[0024] Figure 5 This is a schematic diagram of the installation position structure of the highly elastic deformable wear-resistant and impact-resistant vehicle sunroof clamping structure of the present invention. Figure 5 .

[0025] Figure 6 The invention is a schematic diagram of the cross-sectional structure of a sunroof guide rail clamping joint of a highly elastic, deformable, wear-resistant and impact-resistant vehicle sunroof clamping structure.

[0026] In the figure: 1. sunroof guide rail snap-in joint; 2. sunroof guide rail snap-in slot; 3. sunroof guide rail snap-in through slot; 4. sunroof guide rail; 5. sunroof hose; 6. snap-in joint rubber support; 7. metal rubber support; 8. anti-corrosion protection inner layer; 9. instantaneous anti-buffering and shock-absorbing layer; 10. foam memory alloy mesh layer; 11. anti-corrosion protection outer layer; 12. woven nylon carbon fiber layer; 13. circular fillable buffer cavity; 14. strip-shaped fillable buffer cavity; 15. instantaneous anti-buffering and shock-absorbing glue; 16. elliptical fillable buffer cavity; 17. two-component sound-absorbing cotton layer. DETAILED DESCRIPTION

[0027] The present invention will be further described and illustrated below in conjunction with specific embodiments and the accompanying drawings.

[0028] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "horizontal", "inside", "outside", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] Example 1

[0031] like Figure 1-5 As shown, a highly elastic, deformable, wear-resistant and impact-resistant vehicle sunroof clamping structure comprises a sunroof guide rail clamping joint 1, a sunroof guide rail clamping slot 2 is arranged on the side of the sunroof guide rail clamping joint 1, and a plurality of sunroof guide rail clamping through-slots 3 for binding rolling strips are arranged on the front sides of the sunroof guide rail clamping joint 1 and the sunroof guide rail clamping slot 2; the sunroof guide rail clamping joint 1, the sunroof guide rail clamping slot 2 and the sunroof guide rail clamping through-slot 3 are all arranged on the sunroof guide rail 4, and a sunroof hose 5 is clamped and installed on the sunroof guide rail clamping joint 1, the sunroof guide rail clamping slot 2 and the sunroof guide rail clamping through-slot 3.

[0032] like Figure 6As shown, a highly elastic, deformable, wear-resistant and impact-resistant vehicle sunroof clamping structure, the sunroof guide rail clamping joint 1 includes a clamping joint rubber support body 6, the inner part of the clamping joint rubber support body 6 is wrapped with a metal rubber support body 7, the inner part of the metal rubber support body 7 is wrapped with an anti-corrosion protection inner layer 8, and the inner part of the anti-corrosion protection inner layer 8 is wrapped with an instantaneous anti-buffering and shock-absorbing layer 9.

[0033] like Figure 6 As shown, a highly elastic, deformable, wear-resistant and impact-resistant vehicle sunroof snap-in structure, the outer surface of the snap-in joint rubber support body 6 is wrapped with a woven nylon carbon fiber layer 12, the outer surface of the woven nylon carbon fiber layer 12 is wrapped with a foam memory alloy mesh layer 10, the outer surface of the foam memory alloy mesh layer 10 is wrapped with an anti-corrosion protective outer layer 11, the interior of the snap-in joint rubber support body 6 is provided with a circular fillable buffer cavity 13, a strip-shaped fillable buffer cavity 14 and an elliptical fillable buffer cavity 16, the strip-shaped fillable buffer cavity 14 is filled with an instantaneous anti-buffering shock-absorbing glue 15 of the same material as the instantaneous anti-buffering shock-absorbing layer 9, and the elliptical fillable buffer cavity 16 is filled with a two-component sound-absorbing cotton layer 17.

[0034] like Figure 6 As shown, a highly elastic deformable wear-resistant and impact-resistant vehicle sunroof snap-in structure, the instantaneous anti-buffering and shock-absorbing layer 9 includes the following components in weight percentage: 10% chitosan quaternary ammonium salt modified concentrated latex, 30% polyacrylamide resin liquid, 20% Fe(OH)3 colloid, 20% nano-ferromagnetic matrix modified gelatin, 5% chitosan quaternary ammonium salt modified concentrated latex, 5% artificial plasma, and 10% magnetic powder.

[0035] Furthermore, the sunroof guide rail snap-in slot 2 is flush with the sunroof guide rail snap-in through slot 3, the height of the sunroof guide rail snap-in joint 1 relative to the sunroof guide rail is higher than the sunroof guide rail snap-in slot 2 or the sunroof guide rail snap-in through slot 3, and the sunroof guide rail snap-in joint 1 is provided with a sunroof guide rail snap-in key which is integrally connected to the sunroof guide rail snap-in joint 1, and the sunroof guide rail snap-in key is distributed in an arc shape on the sunroof guide rail snap-in joint 1.

[0036] Furthermore, the thickness of the snap-in joint rubber support body 6 is greater than or equal to the thickness of the instantaneous anti-buffering and shock-absorbing layer 9, the thickness of the instantaneous anti-buffering and shock-absorbing layer 9 is greater than or equal to the thickness of the metal rubber support body 7, the thickness of the metal rubber support body 7 is greater than or equal to the thickness of the foam memory alloy mesh layer 10, the thickness of the foam memory alloy mesh layer 10 is greater than or equal to the thickness of the woven nylon carbon fiber layer 12, the thickness of the woven nylon carbon fiber layer 12 is greater than or equal to the thickness of the anti-corrosion protection inner layer 8, and the thickness of the anti-corrosion protection inner layer 8 is the same as the thickness of the anti-corrosion protection outer layer 11.

[0037] During operation, the sunroof hose 5 to be installed is clamped and installed on the sunroof rail 4 through the sunroof rail clamping joint 1, the sunroof rail clamping slot 2 and the sunroof rail clamping through slot 3. At this time, one end of the sunroof hose 5 is inserted into the sunroof rail clamping joint 1 in the middle of the sunroof rail clamping slot 2, and then the sunroof hose 5 is bundled on the sunroof rail 4 by rolling through the sunroof rail clamping through slot 3;

[0038] Since the sunroof guide rail snap-in joint 1 is integrated with the sunroof guide rail 4, the snap-in joint rubber support body 6, metal rubber support body 7 and foam memory alloy mesh layer 10 inside it will play the role of a frame structure, significantly improving the strength and stiffness of the sunroof guide rail snap-in joint 1, and the woven nylon carbon fiber layer 12 wrapped on the outer surface of the snap-in joint rubber support body 6 can absorb the vibration caused by the sunroof guide rail 4, prevent the sunroof hose 5 from falling off due to vibration, and also play a reinforcing role. The anti-corrosion protection outer layer 11 wrapped on the outer surface of the woven nylon carbon fiber layer 12 and the anti-corrosion protection inner layer 8 wrapped inside the metal rubber support body 7 can effectively protect the main structure of the sunroof guide rail snap-in joint 1 from corrosion damage, the innermost instantaneous anti-buffering and shock-absorbing layer 9 and the instantaneous anti-buffering and shock-absorbing glue 15 filled in the strip-shaped fillable buffer cavity 14 and made of the same material as the instantaneous anti-buffering and shock-absorbing layer 9 can absorb the impact caused by the instantaneous vibration of the sunroof guide rail 4, and prevent the sunroof hose 5 from falling off due to vibration.

[0039] Example 2

[0040] The difference between this embodiment and embodiment 1 is that:

[0041] like Figure 6 As shown, a highly elastic deformable wear-resistant and impact-resistant vehicle sunroof snap-in structure, the instantaneous anti-buffering and shock-absorbing layer 9 includes the following components in weight percentage: 15% chitosan quaternary ammonium salt modified concentrated latex, 30% polyacrylamide resin liquid, 15% Fe(OH)3 colloid, 5% nano-ferromagnetic matrix modified gelatin, 15% chitosan quaternary ammonium salt modified concentrated latex, 10% artificial plasma, and 10% magnetic powder.

[0042] Example 3

[0043] The difference between this embodiment and embodiments 1 and 2 is that:

[0044] like Figure 6 As shown, a highly elastic deformable wear-resistant and impact-resistant vehicle sunroof snap-in structure, the instantaneous anti-buffering and shock-absorbing layer 9 includes the following components in weight percentage: 15% chitosan quaternary ammonium salt modified concentrated latex, 40% polyacrylamide resin liquid, 20% Fe(OH)3 colloid, 5% nano-ferromagnetic matrix modified gelatin, 5% chitosan quaternary ammonium salt modified concentrated latex, 5% artificial plasma, and 10% magnetic powder.

[0045] Example 4

[0046] The difference between this embodiment and embodiments 1, 2 and 3 is that:

[0047] like Figure 6 As shown, a highly elastic deformable wear-resistant and impact-resistant vehicle sunroof snap-in structure, the instantaneous anti-buffering and shock-absorbing layer 9 includes the following components in weight percentage: 10% chitosan quaternary ammonium salt modified concentrated latex, 15% polyacrylamide resin liquid, 30% Fe(OH)3 colloid, 25% nano-ferromagnetic matrix modified gelatin, 5% chitosan quaternary ammonium salt modified concentrated latex, 5% artificial plasma, and 10% magnetic powder.

[0048] In the present invention, the skylight clip-on structure uses rubber, metal rubber and foam memory alloy as the supporting frame of the clip-on structure, and embeds metal reinforcing ribs in the rubber body, which significantly improves the strength and flexibility of the clip-on structure. The rubber body is reinforced by carbon fiber and two-component sound-absorbing cotton, and the vibration generated when the skylight moves is absorbed by the instantaneous anti-buffering and shock-absorbing colloid of the non-Newtonian fluid, which effectively prevents the hose from falling off the clip-on structure and greatly improves the firmness of the clip-on structure. By setting an inner and outer double-layer anti-corrosion protective layer, the internal structure of the clip-on structure is effectively prevented from being damaged by various damages, thereby improving the stability and service life of the clip-on structure.

[0049] The technical solutions disclosed in the embodiments of the present invention are introduced in detail above. The principles and implementation methods of the embodiments of the present invention are explained in this article using specific embodiments. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A highly elastic, deformable, wear-resistant and impact-resistant vehicle sunroof snap-on structure, characterized in that: The sunroof clamping structure comprises a sunroof guide rail clamping joint (1), a sunroof guide rail clamping slot (2) is arranged on the side of the sunroof guide rail clamping joint (1), and a plurality of sunroof guide rail clamping through slots (3) for binding rolling strips are arranged on the front side of the sunroof guide rail clamping joint (1) and the sunroof guide rail clamping slot (2); The sunroof guide rail snap-in joint (1) comprises a snap-in joint rubber support body (6), the snap-in joint rubber support body (6) is internally wrapped with a metal rubber support body (7), the metal rubber support body (7) is internally wrapped with an anti-corrosion protection inner layer (8), and the anti-corrosion protection inner layer (8) is internally wrapped with an instantaneous anti-buffering shock absorbing layer (9); The instantaneous anti-buffering shock-absorbing layer (9) comprises the following components in weight percentage: 10-15% chitosan quaternary ammonium salt modified concentrated latex, 15-40% polyacrylamide resin liquid, 5-30% Fe(OH)3 colloid, 5-25% nano ferromagnetic matrix modified gelatin, 5-15% chitosan quaternary ammonium salt modified concentrated latex, 5-10% artificial plasma, and 10-30% magnetic powder.

2. The highly elastic, deformable, wear-resistant and impact-resistant vehicle sunroof snap-in structure according to claim 1, characterized in that: The sunroof guide rail snap-in joint (1), the sunroof guide rail snap-in slot (2) and the sunroof guide rail snap-in through slot (3) are all arranged on the sunroof guide rail (4), and the sunroof guide rail snap-in joint (1), the sunroof guide rail snap-in slot (2) and the sunroof guide rail snap-in through slot (3) are snap-fitted with a sunroof hose (5).

3. The highly elastic, deformable, wear-resistant and impact-resistant vehicle sunroof snap-in structure according to claim 1, characterized in that: The outer surface of the clamping joint rubber support body (6) is wrapped with a braided nylon carbon fiber layer (12), and the outer surface of the braided nylon carbon fiber layer (12) is wrapped with a foam memory alloy mesh layer (10).

4. The highly elastic deformable wear-resistant and impact-resistant vehicle sunroof snap-in structure according to claim 3, characterized in that: The outer surface of the foam memory alloy mesh layer (10) is wrapped with an anti-corrosion protective outer layer (11), and the interior of the snap joint rubber support body (6) is provided with a circular fillable buffer cavity (13), a strip-shaped fillable buffer cavity (14), and an elliptical fillable buffer cavity (16).

5. The highly elastic deformable wear-resistant and impact-resistant vehicle sunroof snap-in structure according to claim 4, characterized in that: The strip-shaped fillable buffer cavity (14) is filled with an instantaneous anti-buffering shock-absorbing glue (15) made of the same material as the instantaneous anti-buffering shock-absorbing layer (9), and the elliptical fillable buffer cavity (16) is filled with a two-component sound-absorbing cotton layer (17).

6. The highly elastic deformable wear-resistant and impact-resistant vehicle sunroof snap-in structure according to claim 1, characterized in that: The skylight guide rail snap-in slot (2) is flush with the skylight guide rail snap-in through slot (3), and the skylight guide rail snap-in joint (1) is higher than the skylight guide rail snap-in slot (2) or the skylight guide rail snap-in through slot (3) relative to the skylight guide rail.

7. The highly elastic deformable wear-resistant and impact-resistant vehicle sunroof snap-on structure according to claim 6, characterized in that: The sunroof guide rail clamping joint (1) is provided with a sunroof guide rail clamping key which is integrally connected to the sunroof guide rail clamping joint (1), and the sunroof guide rail clamping key is distributed in an arc shape on the sunroof guide rail clamping joint (1).

8. The highly elastic, deformable, wear-resistant and impact-resistant vehicle sunroof snap-in structure according to claim 1, characterized in that: The thickness of the snap-joint rubber support body (6) is greater than or equal to the thickness of the instantaneous anti-buffering and shock-absorbing layer (9), and the thickness of the instantaneous anti-buffering and shock-absorbing layer (9) is greater than or equal to the thickness of the metal rubber support body (7).

9. The highly elastic deformable wear-resistant and impact-resistant vehicle sunroof snap-in structure according to claim 8, characterized in that: The thickness of the metal rubber support body (7) is greater than or equal to the thickness of the foam memory alloy mesh layer (10), and the thickness of the foam memory alloy mesh layer (10) is greater than or equal to the thickness of the woven nylon carbon fiber layer (12).

10. The highly elastic deformable wear-resistant and impact-resistant vehicle sunroof snap-in structure according to claim 9, characterized in that: The thickness of the braided nylon carbon fiber layer (12) is greater than or equal to the thickness of the anti-corrosion protection inner layer (8), and the thickness of the anti-corrosion protection inner layer (8) is the same as the thickness of the anti-corrosion protection outer layer (11).

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