Door ring of vehicle and vehicle

Abstract

The utility model provides a door ring of a vehicle and the vehicle, and relates to the technical field of vehicle structures, the door ring of the vehicle comprises a first metal piece, a second metal piece and a third metal piece, the door ring is defined by the first metal piece and the second metal piece, and the first metal piece and the second metal piece are of an integrally formed structure; the second metal part is close to the bottom of the vehicle relative to the first metal part, the third metal part is arranged on the second metal part, the third metal part is electrically connected with the second metal part, the electrode potential of the third metal part is smaller than that of the second metal part, and / or the outer surface of the second metal part is covered with a corrosion-resistant layer. According to the door ring of the vehicle provided by the embodiment of the invention, the corrosion resistance of the second metal piece easy to wade on the door ring can be improved, and the manufacturing cost of the door ring can be reduced through local corrosion prevention.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle structures, and in particular to a door ring of a vehicle and a vehicle. Background Art

[0002] The door knocker is one of the important structures of a vehicle. It can improve the strength of the vehicle body, and the door knocker is also used for installation and connection with the vehicle door.

[0003] In the related art, a door ring is formed by welding a plurality of sheet metal parts by laser welding, and the plurality of sheet metal parts are surrounded by the plurality of sheet metal parts to form the shape of the door ring. The welded plurality of sheet metal parts are then die-cast to form a door ring.

[0004] However, the area of ​​the door ring in the above-mentioned related art close to the bottom of the vehicle is easily corroded and damaged after wading, resulting in a decrease in the structural strength of the door ring, affecting the overall strength and safety of the vehicle. Utility Model Content

[0005] An embodiment of the present application provides a vehicle door ring and a vehicle, which are used to solve the technical problem in the above-mentioned related art that the area of ​​the door ring close to the bottom of the vehicle is easily corroded and damaged after wading, resulting in a reduction in the structural strength of the door ring and affecting the overall strength and safety of use of the vehicle.

[0006] In order to achieve the above objectives, the present application provides the following technical solutions:

[0007] A first aspect of an embodiment of the present application provides a door knocker of a vehicle, comprising: a first metal member, a second metal member, and a third metal member;

[0008] The first metal member and the second metal member form the door ring, and the first metal member and the second metal member are an integrally formed structure;

[0009] The second metal member is closer to the bottom of the vehicle relative to the first metal member;

[0010] The third metal member is disposed on the second metal member, the third metal member is electrically connected to the second metal member at a connection point, and the electrode potential of the third metal member is more negative than the electrode potential of the second metal member;

[0011] And / or, the outer surface of the second metal part is covered with a corrosion-resistant layer.

[0012] Based on the above technical solution, the present application can also be improved as follows.

[0013] In a possible implementation manner, the third metal member is disposed in a region of the second metal member close to the bottom of the vehicle.

[0014] In a possible implementation manner, a through hole is opened along the thickness direction of the second metal member, and the third metal member is embedded in the through hole.

[0015] In a possible implementation, there are a plurality of through holes, and the plurality of through holes are spaced and evenly arranged along the extension direction of the second metal member;

[0016] There are also a plurality of the third metal pieces, each of which is embedded in one of the through holes;

[0017] Furthermore, a distance between two adjacent through holes is greater than or equal to 200 mm and less than or equal to 300 mm.

[0018] In a possible implementation, the third metal member is a rivet structure, which includes a rivet core and a rivet head. The rivet core is interference-fitted in the through hole, and the rivet head is pressed against the surface of the second metal member.

[0019] In a possible implementation, the outer diameter of the rivet core is smaller than the inner diameter of the through hole;

[0020] And / or, the diameter of the through hole is greater than or equal to 6 mm and less than or equal to 24 mm.

[0021] In a possible implementation, the outer diameter of the rivet head is greater than or equal to twice the outer diameter of the rivet core.

[0022] In a possible implementation manner, the third metal member is a zinc nail or a zinc block.

[0023] In a possible implementation, the corrosion-resistant layer is a galvanized layer or an aluminum-silicon coating.

[0024] A second aspect of an embodiment of the present application provides a vehicle, comprising a vehicle body and a door knocker of the vehicle as described above.

[0025] The embodiment of the present application provides a vehicle door knocker and a vehicle, wherein the vehicle door knocker comprises a first metal member, a second metal member and a third metal member. The first metal member and the second metal member are enclosed to form a door knocker, and the first metal member and the second metal member are an integrally formed structure, so that the structural strength of the door knocker can be improved, thereby improving the structural strength of the vehicle using the door knocker and improving the safety of the vehicle.

[0026] The second metal part is closer to the bottom of the vehicle relative to the first metal part, and the third metal part is arranged on the second metal part. The connection between the third metal part and the second metal part is electrically connected, and the electrode potential of the third metal part is more negative than the electrode potential of the second metal part. When the second metal part is immersed in water, the second metal part can be protected by the electrochemical corrosion protection of the third metal part whose sacrificial corrosion electrode potential is more negative than that of the second metal part, thereby reducing the probability of corrosion of the second metal part when immersed in water, improving the corrosion resistance of the second metal part, reducing the probability of damage to the second metal part due to corrosion, and reducing the probability of the second metal part affecting the structural strength of the door knocker and the vehicle due to corrosion damage.

[0027] Furthermore, by covering the outer surface of the second metal part with a corrosion-resistant layer, the probability of the second metal part being corroded and damaged due to the adhesion of corrosive liquid to the surface of the second metal part can be reduced, and the corrosion resistance of the second metal part can be further improved.

[0028] In addition, by performing anti-corrosion treatment on the second metal part on the door knocker that is easily immersed in water, and not providing a corrosion-resistant layer and a third metal part on the first metal part that is not easily immersed in water, it is possible to perform anti-corrosion treatment on the local area on the door knocker that is easily immersed in water and easily corroded, thereby reducing the manufacturing cost of the door knocker while ensuring the anti-corrosion performance of the door knocker, thereby reducing the manufacturing cost of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A schematic diagram of the structure of a door knocker provided in an embodiment of the present application;

[0031] Figure 2 A schematic diagram of the structure of the components of a door ring before welding provided in an embodiment of the present application;

[0032] Figure 3 Provided in the embodiments of this application Figure 1 Cross-sectional view of the local structure at M in FIG.

[0033] Description of reference numerals:

[0034] 100- a first metal member;

[0035] 110 - first component; 120 - second component; 130 - third component;

[0036] 200- second metal member;

[0037] 210-through hole;

[0038] 300-third metal part;

[0039] 310- rivet core; 320- rivet head;

[0040] 400-Corrosion resistant layer. DETAILED DESCRIPTION

[0041] As described in the background technology, the area near the bottom of the vehicle in the door ring in the prior art is easily corroded and damaged after wading, resulting in reduced structural strength of the door ring, affecting the overall strength and safety of the vehicle. The reason for this problem is that the door ring in the prior art has not been treated with anti-corrosion, resulting in the area near the bottom of the vehicle on the door ring being easily corroded and damaged after wading, thereby reducing the structural strength of the door ring, and further reducing the overall strength of the vehicle and reducing the safety of the vehicle.

[0042] In view of the above technical problems, the embodiment of the present application provides a vehicle door knocker and a vehicle, wherein the vehicle door knocker comprises a first metal member, a second metal member and a third metal member. By enclosing the first metal member and the second metal member into a door knocker, and the first metal member and the second metal member are an integrally formed structure, the structural strength of the door knocker can be improved, thereby improving the structural strength of the vehicle using the door knocker and improving the safety of the vehicle.

[0043] The second metal part is closer to the bottom of the vehicle relative to the first metal part, and the third metal part is arranged on the second metal part. The connection between the third metal part and the second metal part is electrically connected, and the electrode potential of the third metal part is more negative than the electrode potential of the second metal part. When the second metal part is immersed in water, the second metal part can be protected by sacrificing the corrosion electrode potential of the third metal part which is more negative than that of the second metal part, thereby reducing the probability of corrosion of the second metal part when immersed in water, improving the corrosion resistance of the second metal part, reducing the probability of damage to the second metal part due to corrosion, and reducing the probability of the second metal part affecting the structural strength of the door knocker and the vehicle due to corrosion damage.

[0044] Furthermore, by covering the outer surface of the second metal part with a corrosion-resistant layer, the probability of the second metal part being corroded and damaged due to the adhesion of corrosive liquid to the surface of the second metal part can be reduced, and the corrosion resistance of the second metal part can be further improved.

[0045] In addition, by performing anti-corrosion treatment on the second metal part on the door knocker that is easily immersed in water, and not providing a corrosion-resistant layer and / or a third metal part on the first metal part that is not easily immersed in water, it is possible to perform anti-corrosion treatment on the local area on the door knocker that is easily immersed in water and easily corroded, thereby reducing the manufacturing cost of the door knocker while ensuring the anti-corrosion performance of the door knocker, thereby reducing the manufacturing cost of the vehicle.

[0046] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of this application.

[0047] refer to Figure 1 and Figure 2 An embodiment of the present application provides a door ring of a vehicle, which may include a first metal member 100, a second metal member 200 and a third metal member 300. The first metal member 100 and the second metal member 200 form a door ring, and the first metal member 100 and the second metal member 200 are an integrally formed structure.

[0048] In some embodiments, the first metal member 100 and the second metal member 200 can be connected by laser welding, and the welded first metal member 100 and the second metal member 200 can be processed and formed into an integrated door knocker by hot pressing.

[0049] In this way, the door knocker of the vehicle may include the first metal member 100, the second metal member 200 and the third metal member 300. By enclosing the first metal member 100 and the second metal member 200 to form a door knocker, and the first metal member 100 and the second metal member 200 are an integrally formed structure, the structural strength of the door knocker can be improved, thereby improving the structural strength of the vehicle using the door knocker and improving the safety of the vehicle.

[0050] refer to Figure 1 and Figure 2 The second metal part 200 is closer to the bottom of the vehicle relative to the first metal part 100. Therefore, after the door knocker is installed on the vehicle body, since the second metal part 200 is closer to the bottom of the vehicle body relative to the first metal part 100, when the vehicle is wading or parked in water, the second metal part 200 is more likely to be immersed in water or adhere to water droplets. The second metal part 200 is more likely to be corroded than the first metal part 100.

[0051] The third metal member 300 is disposed on the second metal member 200, and the connection between the third metal member 300 and the second metal member 200 is electrically connected, that is, the connection between the third metal member 300 and the second metal member 200 allows current to pass through, and the electrode potential of the third metal member 300 is negative to the electrode potential of the second metal member 200. It can be seen that, by using the principle of electrochemical corrosion protection, the third metal member 300 can be used as a sacrificial anode material to be consumed, and when the third metal member 300 and the second metal member 200 are both immersed in water or in a humid environment, the third metal member 300 can be corroded and consumed to protect the second metal member 200 from corrosion.

[0052] In this way, when the second metal part 200 is immersed in water or in a humid environment, the second metal part 200 can be protected by sacrificing the third metal part 300 whose corrosion electrode potential is more negative than that of the second metal part 200, thereby reducing the probability of the second metal part 200 being easily corroded when immersed in water, improving the corrosion resistance of the second metal part 200, reducing the probability of the second metal part 200 being damaged due to corrosion, and reducing the probability of the second metal part 200 being damaged due to corrosion and affecting the structural strength of the door knocker and the vehicle.

[0053] refer to Figure 1 and Figure 3 , the outer surface of the second metal member 200 is covered with a corrosion-resistant layer 400. In this way, by covering the outer surface of the second metal member 200 with the corrosion-resistant layer 400, the probability of the second metal member 200 being corroded and damaged due to the adherence of corrosive liquid to the surface of the second metal member 200 can be reduced, and the corrosion resistance of the second metal member 200 can be further improved.

[0054] Furthermore, by performing anti-corrosion treatment on the second metal part 200 on the door knocker that is easily immersed in water, and not providing the corrosion-resistant layer 400 and the third metal part 300 on the first metal part 100 that is not easily immersed in water, it is possible to perform anti-corrosion treatment on the local area on the door knocker that is easily immersed in water and easily corroded, thereby reducing the manufacturing cost of the door knocker while ensuring the anti-corrosion performance of the door knocker, thereby reducing the manufacturing cost of the vehicle.

[0055] In some embodiments, after welding, the first metal member 100 and the second metal member 200 may be subjected to a heating austenitization process, and during the heating austenitization process, methane and nitrogen may be used for protection, and then the austenitized first metal member 100 and the second metal member 200 may be subjected to hot forming, and further subjected to cooling, shot blasting, oil spraying, etc. Among them, only the first metal member 100 is subjected to the shot blasting and oil spraying processes.

[0056] refer to Figure 1 and Figure 2In some embodiments, the first metal member 100 may further include a first component 110, a second component 120, and a second component 120. One end of the first component 110 is welded to one end of the second metal member 200 in the length extension direction, and the other end of the first component 110 is welded to one end of the second component 120. The second component 120 and the second metal member 200 are spaced apart, and the second component 120 is away from the bottom of the vehicle body relative to the first component 110. One end of the third component 130 is welded to the other end of the second metal member 200 in the length extension direction, and the other end of the third component 130 is connected to one end of the second component 120 away from the first component 110, so as to form a door ring through the first component 110, the second component 120, the third component 130, and the second metal member 200.

[0057] refer to Figure 1 In some embodiments, the third metal member 300 is disposed in an area of ​​the second metal member 200 close to the bottom of the vehicle.

[0058] In this way, by arranging the third metal component 300 in the area where the second metal component 200 is close to the bottom of the vehicle, it is more conducive to immersing the second metal component 200 and the third metal component 300 in water at the same time in areas where the vehicle wades shallow water.

[0059] For example, when only a portion of the second metal part 200 close to the bottom of the vehicle is immersed in water, since the third metal part 300 is arranged on the second metal part 200 relatively close to the bottom area of ​​the vehicle, the second metal part 200 and the third metal part 300 can be immersed in water, which is beneficial for protecting the second metal part 200 from corrosion by sacrificing the third metal part 300, thereby improving the practicality and corrosion resistance of the door knocker.

[0060] refer to Figure 1 In some embodiments, a through hole 210 is opened along the thickness direction of the second metal member 200 , and the third metal member 300 is embedded in the through hole 210 .

[0061] In this way, by opening a through hole 210 in the thickness direction of the second metal component 200 and embedding the third metal component 300 in the through hole 210, the probability of the third metal component 300 falling off the second metal component 200 can be reduced, thereby improving the connection stability between the third metal component 300 and the second metal component 200.

[0062] refer to Figure 1 In some embodiments, there are multiple through holes 210 , and the multiple through holes 210 are spaced and evenly arranged along the extension direction of the second metal member 200 . There are also multiple third metal members 300 , and each third metal member 300 is embedded in a through hole 210 .

[0063] In this way, by arranging multiple third metal parts 300 on the second part and correspondingly embedding a third metal part 300 in each through hole 210, the anti-corrosion effect of the second metal part 200 on the door ring can be improved, thereby improving the service life of the door ring and the corrosion resistance and service life of the vehicle.

[0064] Furthermore, by arranging the through holes 210 at intervals and evenly along the length direction of the second metal component 200 , the plurality of third metal components 300 can be distributed more evenly on the second metal component 200 , thereby improving the uniformity of protection of the surface of the second metal component 200 .

[0065] Continue to refer Figure 1 In some embodiments, the spacing between two adjacent through holes 210 (eg Figure 1 (as shown in L1 in FIG) is greater than or equal to 200 mm and less than or equal to 300 mm.

[0066] In some embodiments, the distance L1 between two adjacent through holes 210 may be one of 220 mm, 250 mm and 270 mm. Alternatively, the distance L1 between two adjacent through holes 210 may be any value between 200 mm and 300 mm.

[0067] Thus, by making the distance L1 between two adjacent through holes 210 greater than 200 mm, the number of third metal parts 300 used can be reduced, thereby reducing the manufacturing cost of the door knocker. By making the distance L1 between two adjacent through holes 210 less than 300 mm, the coverage area of ​​the third metal part 300 on the second metal part 200 can be ensured, thereby improving the corrosion resistance of the second metal part 200.

[0068] refer to Figure 1 and Figure 3 In some embodiments, the third metal member 300 is a rivet structure, which may include a rivet core 310 and a rivet head 320 . The rivet core 310 is interference fit in the through hole 210 , and the rivet head 320 is pressed against the surface of the second metal member 200 .

[0069] In this way, by setting the third metal part 300 as a rivet structure, the third metal part 300 can be riveted into the through hole 210 on the second metal part 200, thereby improving the connection stability between the second metal part 200 and the third metal part 300 and reducing the probability of the third metal part 300 falling off the second metal part 200.

[0070] refer to Figure 1In some embodiments, the outer diameter of the rivet core 310 is smaller than the inner diameter of the through hole 210. In this way, an interference fit between the rivet core 310 and the through hole 210 can be achieved, thereby reducing the movement of the rivet core 310 relative to the through hole 210 in the through hole 210, improving the connection stability between the rivet core 310 and the through hole 210, and further reducing the probability of the third metal member 300 falling off from the second metal member 200.

[0071] Exemplarily, the diameter of the through hole 210 can be greater than or equal to 6 mm and less than or equal to 24 mm. For example, the diameter of the through hole 210 can be one of 7 mm, 9 mm, 13 mm, 16 mm and 21 mm. Alternatively, the diameter of the through hole 210 can be any point value within the range of greater than or equal to 6 mm and less than or equal to 24 mm.

[0072] In this way, by making the diameter of the through hole 210 greater than or equal to 6 mm and less than or equal to 24 mm, the volume of the third metal component 300 can be limited, thereby reducing the manufacturing cost of the third metal component 300 and further reducing the manufacturing cost of the door knocker.

[0073] refer to Figure 1 In some embodiments, the outer diameter of the rivet head 320 is greater than or equal to twice the outer diameter of the rivet core 310. Thus, by making the outer diameter of the rivet head 320 greater than or equal to twice the outer diameter of the rivet core 310, the contact area between the rivet head 320 and the surface of the second metal member 200 near the through hole 210 can be increased, thereby increasing the abutment area between the rivet head 320 and the second metal member 200 in the axial direction of the rivet core 310, thereby reducing the probability of the rivet core 310 coming out of the through hole 210, and improving the connection stability between the third metal member 300 and the second metal member 200.

[0074] refer to Figure 1 and Figure 3 In some embodiments, the third metal member 300 may be a zinc nail or a zinc block. If the third metal member 300 is a zinc nail, the zinc nail may be riveted to the second metal member 200 by riveting. If the third metal member 300 is a zinc block, the third metal member 300 may be embedded in the second metal member 200.

[0075] In other embodiments, the third metal component 300 may also be a structural component made of metal magnesium material.

[0076] refer to Figure 3 In some embodiments, the corrosion-resistant layer 400 may be a galvanized layer or an aluminum silicon coating.

[0077] By setting the corrosion-resistant layer 400 as a galvanized layer, the galvanized layer forms a dense protective film on the surface of the second metal, blocking the direct contact between moisture, oxygen and other corrosive substances and the iron substrate, thereby effectively reducing the occurrence of corrosion. Zinc easily reacts with oxygen in the air to form a dense zinc oxide or zinc carbonate film. These passivation films can prevent further oxidation reactions and enhance the anti-corrosion performance of the galvanized layer.

[0078] The aluminum silicon coating can form a dense aluminum oxide protective film to effectively prevent oxidation and corrosion of the second metal member 200. The aluminum silicon coating has good adhesion to the substrate, is not easy to peel off or fall off from the second metal member 200, and can remain stable under mechanical stress.

[0079] An embodiment of the present application also provides a vehicle, which may include a vehicle body and a door knocker of the vehicle as above.

[0080] In this way, by arranging the above-mentioned door knocker on the vehicle body, the corrosion resistance of the door knocker is enhanced, thereby reducing the probability of the door knocker being damaged due to corrosion, improving the overall strength and practicality of the vehicle, and reducing the process of frequent replacement and maintenance of the door knocker, thereby improving the corrosion resistance and practicality of the vehicle.

[0081] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0082] It should be noted that the phrases "in specific implementation", "in some embodiments", "in this embodiment", "exemplarily" and the like mentioned in the specification indicate that the described embodiment may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing specific features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments that are explicitly or not explicitly described.

[0083] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0084] It should be easily understood that “on,” “above,” and “over” in the present disclosure should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above” or “over,” but also may include the meaning of “above” or “over something” with no intervening features or layers therebetween (i.e., directly on something).

[0085] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A door knocker of a vehicle, characterized in that: comprising a first metal member, a second metal member and a third metal member; The first metal member and the second metal member form the door ring, and the first metal member and the second metal member are an integrally formed structure; The second metal member is closer to the bottom of the vehicle relative to the first metal member; The third metal member is disposed on the second metal member, the third metal member is electrically connected to the second metal member at a connection point, and the electrode potential of the third metal member is more negative than the electrode potential of the second metal member; And / or, the outer surface of the second metal part is covered with a corrosion-resistant layer.

2. The door knocker of a vehicle according to claim 1, characterized in that: The third metal member is disposed in an area of ​​the second metal member close to the bottom of the vehicle.

3. The door knocker of a vehicle according to claim 2, characterized in that: A through hole is opened along the thickness direction of the second metal component, and the third metal component is embedded in the through hole.

4. The vehicle door knocker according to claim 3, characterized in that: There are a plurality of through holes, and the plurality of through holes are spaced and evenly arranged along the extension direction of the second metal member; There are also a plurality of the third metal pieces, each of which is embedded in one of the through holes; Furthermore, a distance between two adjacent through holes is greater than or equal to 200 mm and less than or equal to 300 mm.

5. The door knocker of a vehicle according to claim 4, characterized in that: The third metal part is a rivet structure, which includes a rivet core and a rivet head. The rivet core is interference-fitted in the through hole, and the rivet head is pressed against the surface of the second metal part.

6. The door knocker of a vehicle according to claim 5, characterized in that: The outer diameter of the rivet core is smaller than the inner diameter of the through hole; And / or, the diameter of the through hole is greater than or equal to 6 mm and less than or equal to 24 mm.

7. The door knocker of a vehicle according to claim 5, characterized in that: The outer diameter of the rivet head is greater than or equal to twice the outer diameter of the rivet core.

8. The door knocker of a vehicle according to any one of claims 1 to 7, characterized in that: The third metal piece is a zinc nail or a zinc block.

9. The door knocker of a vehicle according to any one of claims 1 to 7, characterized in that: The corrosion-resistant layer is a galvanized layer or an aluminum silicon coating.

10. A vehicle, characterized in that: The invention comprises a vehicle body and a door knocker of the vehicle according to any one of claims 1 to 9.

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