Back door supporting rod reinforcing piece, back door inner plate assembly and vehicle

Abstract

The utility model provides a back door supporting rod reinforcing piece, a back door inner plate assembly and a vehicle, which are used for solving the problem of low-frequency rapping sound caused by coupling between a middle back door mode and a sound cavity mode on the premise of not increasing the weight cost. The back door stay bar reinforcer comprises: a reinforcer body; the reinforcer body is provided with a connecting part used for being connected with a back door inner plate and a concave part facing the back door inner plate.

Description

Technical Field

[0001] The utility model relates to the field of back doors, in particular to a back door stay reinforcement, a back door inner panel assembly and a vehicle. Background Art

[0002] The NVH performance of a car is the most direct feeling of the user on the quality of the whole car. Its level reflects the design and manufacturing quality of the car and is one of the important factors affecting the market performance of the vehicle. Traditional internal combustion engine cars have three major noise sources: power noise, wind noise and road noise. For emerging electric vehicles, without the noise of the engine and intake and exhaust system, the road noise problem becomes particularly prominent.

[0003] In recent years, the number of customer complaints (TGW) about automobile road noise has become increasingly serious. Further analysis of big data has found that the low-frequency "drum-beating" problem is the most common complaint from customers. The "drum-beating" is caused by the tires vibrating due to the excitation of the road surface during the driving process of the vehicle. This vibration is transmitted to the suspension and then to the body. The excited body radiates sound into the car, forming structure-borne road noise, that is, low-frequency "drum-beating".

[0004] Through CAE simulation analysis and experimental verification of the tailgate assembly in CN214355482U, it was found that the main reason for the low-frequency "drum-beating" problem is that the local mode of the car body (floor, tailgate, etc.) is coupled with the acoustic cavity mode, forming a "drum-beating" sound in the car.

[0005] For the design of the tailgate structure, the current mainstream approach is: product engineers complete the tailgate structure model according to the styling and general layout requirements; simulation analysis engineers determine the tailgate sensitive area based on the road noise simulation analysis results, and optimize it by adding connectors / reinforcements in the structural sensitive area. This solution can improve the tailgate mode and solve the low-channel road noise problem, but it will also bring about problems such as increased tailgate weight, increased costs and insufficient tailgate strut support, and the implementation cost is relatively high.

[0006] In summary, it is urgent to design a structure that does not increase weight costs, does not affect production rhythm, and at the same time improves the back door mode to solve the low-frequency "drum knocking sound" caused by the coupling of the back door mode and the acoustic cavity mode. Summary of the invention

[0007] The utility model provides a back door support rod reinforcement, a back door inner panel assembly and a vehicle, which are used to solve the low-frequency "drum knocking sound" caused by the coupling between the back door mode and the sound cavity mode without increasing the weight cost.

[0008] The technical solution of the utility model is:

[0009] In one aspect, the utility model provides a back door stay reinforcement, comprising: a reinforcement body;

[0010] The reinforcement body has a connection portion for connecting with the back door inner panel and a recessed portion arranged facing the back door inner panel.

[0011] Furthermore, the reinforcement body also has an avoidance sink for allowing a welding gun to extend into a welding point on the connecting portion of the reinforcement body.

[0012] Furthermore, the first end surface of the reinforcement body is recessed toward a side away from the back door inner plate to form the recessed portion, and the first end surface is an end surface of the reinforcement body facing the back door inner plate;

[0013] The second end surface of the reinforcement body is recessed toward a side close to the tailgate inner plate to form the avoidance sink, and the second end surface is the other side end surface of the reinforcement body away from the tailgate inner plate.

[0014] Furthermore, the recessed portion passes through the third end face and the fourth end face opposite to each other on the reinforcement body, the third end face is the end face of the reinforcement body facing the preset cavity on the tail door inner panel, and the preset cavity on the tail door inner panel refers to the cavity arranged adjacent to the tail door window frame set on the tail door inner panel.

[0015] On the other hand, the utility model further provides a back door inner panel assembly, comprising a back door inner panel and a back door stay rod reinforcement member connected to the back door inner panel, wherein the back door stay rod reinforcement member is provided with a recessed portion facing the back door inner panel;

[0016] A cavity for improving the rigidity and mode of the back door is formed between the recessed portion of the back door stay reinforcement and the end surface of the back door inner panel.

[0017] Furthermore, the cavity formed between the recessed portion of the tailgate stay reinforcement and the end surface of the tailgate inner panel is connected to a preset cavity on the tailgate inner panel, and the preset cavity is a cavity adjacent to a tailgate window frame provided on the tailgate inner panel.

[0018] Furthermore, the tailgate stay reinforcement and the tailgate inner panel are fixed by welding.

[0019] Furthermore, the second end surface of the tailgate strut reinforcement facing away from the tailgate inner panel is recessed toward a side close to the tailgate inner panel to form an avoidance sink, and the avoidance sink is used to allow a welding gun to extend into a welding point on the connecting portion of the tailgate strut reinforcement.

[0020] Furthermore, the depth of the recessed portion is greater than the opening width of the recessed portion on the first end surface of the tailgate stay reinforcement.

[0021] On the other hand, the utility model further provides a vehicle, comprising the above-mentioned back door inner panel assembly.

[0022] The beneficial effects of the utility model are:

[0023] The knocking sound problem is solved by improving the structure of the existing tailgate strut reinforcement on the vehicle without increasing the weight of the structure. The recessed portion formed on the reinforcement body changes the geometric shape of the reinforcement body and increases the moment of inertia of the section. Since the moment of inertia of the section is a physical quantity that reflects the ability of an object to resist rotation and is a key parameter for evaluating structural stiffness and mode, the increase in the moment of inertia of the section brings about an improvement in stiffness and mode. Therefore, by relying on the change in the modal characteristics of the reinforcement body, after it is assembled with the tailgate inner panel, the tailgate mode will also change accordingly, thereby decoupling the tailgate mode from the acoustic cavity mode, solving the low-frequency knocking sound occasionally caused by the tailgate mode and the acoustic cavity mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a structural front view of a back door inner panel assembly in an embodiment;

[0025] Figure 2 for Figure 1 AA section view in;

[0026] Figure 3 for Figure 1 BB section diagram in;

[0027] Figure 4 is a schematic structural diagram of a back door inner panel in an embodiment;

[0028] Figure 5 is a schematic diagram of assembling a back door stay reinforcement and a back door inner panel in an embodiment;

[0029] Figure 6 for Figure 5 CC profile in ;

[0030] Figure 7 A diagram showing the position relationship between the welding gun and the avoidance sink when welding the tailgate support rod reinforcement and the tailgate inner panel in the embodiment;

[0031] Explanation of the reference numerals: 1 - tail door inner panel; 2 - tail door support rod reinforcement; 11 - cavity arranged adjacent to the tail door window frame; 21 - recessed portion; 22 - avoidance sink; 201 - first end face; 202 - second end face; 3 - welding gun. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0033] Combination Figure 1 and Figure 2 The embodiment of the utility model provides a back door stay reinforcement 2, comprising: a reinforcement body; the reinforcement body has a connecting portion for connecting with the back door inner panel 1 and a recessed portion 21 arranged facing the back door inner panel 1.

[0034] Specifically, refer to Figure 2 The first end surface 201 of the reinforcement body is recessed toward the side away from the back door inner panel 1 to form the aforementioned recessed portion 21 . The first end surface 201 is the end surface of the reinforcement body facing the back door inner panel 1 .

[0035] In this embodiment, according to the pre-constructed tailgate modal and stiffness analysis, the depth of the recessed portion 21 is set to be greater than the opening width of the recessed portion 21 on the first end surface 201 of the tailgate stay reinforcement 2 .

[0036] The above-mentioned tailgate stay reinforcement 2 solves the drumming problem by utilizing the structural improvement of the tailgate stay reinforcement 2 already on the vehicle without increasing the weight of the structure. The recessed portion 21 formed on the reinforcement body changes the geometric shape of the reinforcement body and increases the section moment of inertia. Since the section moment of inertia is a physical quantity of the object's ability to resist rotation and is a key parameter for evaluating the structural stiffness and mode, the increase in the section moment of inertia brings about an improvement in stiffness and mode.

[0037] The recessed portion 21 formed on the reinforcement body affects its natural frequency and vibration mode; since the natural frequency is the vibration characteristic of the structure itself, and the vibration mode describes the shape change of the structure when it vibrates; by designing the recessed portion 21 on the reinforcement body, the modal characteristics of the reinforcement body can be adjusted to have better vibration performance within a specific frequency range, reduce the risk of resonance, or change its vibration response characteristics to meet specific engineering needs. Therefore, relying on the change in the modal characteristics of the reinforcement body, after it is assembled with the tailgate inner panel 1, the tailgate mode will also change accordingly, thereby decoupling the tailgate mode from the acoustic cavity mode, solving the low-frequency drumming sound occasionally caused by the tailgate mode and the acoustic cavity mode.

[0038] Reference Figures 5 to 7 The reinforcement body also has an avoidance sink 22 for allowing the welding gun 3 to extend into the welding point on the connecting part of the reinforcement body.

[0039] Specifically, the second end surface 202 of the reinforcement body is recessed toward a side close to the tailgate inner panel 1 to form an avoidance platform 22 , and the second end surface 202 is the other side end surface of the reinforcement body away from the tailgate inner panel 1 .

[0040] from Figure 5 and Figure 6 From the perspective of FIG. 1 , the avoidance platform 22 in this embodiment is provided at multiple locations, matching the multiple welding points on the reinforcement body, that is, the number and position of the avoidance platform 22 and the welding points are arranged one by one. Figure 7 From the perspective of FIG. 1 , when the welding gun 3 is welding the welding points on the reinforcement body, the design of the avoidance sink 22 allows the welding gun 3 to extend into the welding points, thereby achieving a spot welding connection between the reinforcement body and the back door inner panel 1 .

[0041] Combination Figure 3 and Figure 4 The recessed portion 21 passes through the third and fourth end faces opposite to each other on the reinforcement body, the third end face is the end face of the reinforcement body facing the preset cavity on the tail door inner panel 1, and the preset cavity on the tail door inner panel 1 refers to the cavity 11 arranged adjacent to the tail door window frame set on the tail door inner panel 1.

[0042] When the reinforcement body is assembled on the tailgate inner panel 1, the recessed portion 21 specifically penetrates the upper and lower end faces of the reinforcement body. Combined with the actual state of the tailgate strut reinforcement 2 after being installed on the tailgate inner panel 1, the third end face refers to the upper end face of the reinforcement body, and the fourth end face refers to the lower end face of the reinforcement body. Since the recessed portion 21 penetrates the upper and lower end faces of the reinforcement body, the continuity of the cavities on both sides of the tailgate frame is ensured, further increasing the stiffness and modality of the tailgate; if the recessed portion 21 of the tailgate strut reinforcement 2 does not extend to the cavities on both sides of the tailgate frame, it is equivalent to interrupting the cavities on both sides of the tailgate frame, forming a "gooseneck" structure, which will lead to insufficient modal enhancement.

[0043] Combination Figures 1 to 7 Based on the description of the back door stay reinforcement 2, the embodiment of the utility model further provides a back door inner panel assembly, including a back door inner panel 1 and a back door stay reinforcement 2 connected to the back door inner panel 1, wherein the structure of the back door stay reinforcement 2 is completely consistent with the above description. That is, a cavity is formed between the back door inner panel 1 and the back door stay reinforcement 2 by relying on the aforementioned recessed portion 21, and the design of the cavity changes the modal characteristics and stiffness of the overall back door inner panel assembly, thereby solving the low-frequency drumming sound occasionally caused by the back door mode and the acoustic cavity mode.

[0044] For the tailgate inner panel assembly in this embodiment, there is no need to add additional connectors or reinforcements. The aforementioned low-frequency drumming sound problem can be solved by simply using the tailgate support rod reinforcement 2 to design the recessed portion 21 without increasing the overall structural weight.

[0045] In this embodiment, the tailgate inner panel 1 and the tailgate stay reinforcement 2 are fixed by spot welding.

[0046] On the other hand, the utility model further provides a vehicle, comprising the above-mentioned back door inner panel assembly.

[0047] Based on the aforementioned improved tailgate assembly, a stiffness and modal analysis was performed on the tailgate, and it was determined that the tailgate stiffness was greatly improved, and the tailgate modal was improved by 35%.

[0048] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0049] Although the preferred embodiments of the utility model embodiments have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the utility model embodiments.

[0050] It should also be noted that, in this article, the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is for the convenience of describing the utility model 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 utility model. In addition, relational terms such as "first" and "second" are used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or terminal device including a series of elements does not include those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0051] The technical solution provided by the utility model is described in detail above. The principle and implementation method of the utility model are described in this article using specific examples. The description of the above embodiments is only used to help understand the utility model, and the content of this specification should not be understood as limiting the utility model. At the same time, for those skilled in the art, according to the utility model, there will be different forms of changes in the specific implementation methods and application scopes. It is not necessary and impossible to list all the implementation methods here, and the obvious changes or modifications derived from them are still within the protection scope of the utility model.

Claims

1. A back door stay reinforcement, characterized in that: include: A reinforcement body; The reinforcement body has a connection portion for connecting with the back door inner panel and a recessed portion arranged facing the back door inner panel; The recessed portion passes through the third and fourth end faces opposite to each other on the reinforcement body, the third end face is the end face of the reinforcement body facing the preset cavity on the tail door inner panel, and the preset cavity on the tail door inner panel refers to the cavity arranged adjacent to the tail door window frame set on the tail door inner panel.

2. The back door stay reinforcement according to claim 1, characterized in that: The reinforcement body also has an avoidance sink for allowing a welding gun to extend into a welding point on the connecting portion of the reinforcement body.

3. The back door stay reinforcement according to claim 2, characterized in that: The first end surface of the reinforcement body is recessed toward a side away from the back door inner plate to form the recessed portion, and the first end surface is an end surface of the reinforcement body facing the back door inner plate; The second end surface of the reinforcement body is recessed toward a side close to the tailgate inner plate to form the avoidance sink, and the second end surface is the other side end surface of the reinforcement body away from the tailgate inner plate.

4. A back door inner panel assembly, comprising a back door inner panel and a back door stay reinforcement connected to the back door inner panel, characterized in that: The tailgate stay reinforcement is provided with a recessed portion facing the tailgate inner panel; A cavity for improving the stiffness and mode of the tailgate is formed between the recessed portion of the tailgate strut reinforcement and the end surface of the tailgate inner panel; the cavity formed between the recessed portion of the tailgate strut reinforcement and the end surface of the tailgate inner panel is connected to a preset cavity on the tailgate inner panel, and the preset cavity is a cavity adjacent to a tailgate window frame arranged on the tailgate inner panel.

5. The back door inner panel assembly according to claim 4, characterized in that: The back door stay reinforcement and the back door inner panel are welded and fixed.

6. The back door inner panel assembly according to claim 5, characterized in that: The end surface of the tailgate stay reinforcement away from the tailgate inner panel is recessed toward a side close to the tailgate inner panel to form an avoidance sink, and the avoidance sink is used to allow a welding gun to extend into a welding point on the connecting portion of the tailgate stay reinforcement.

7. The back door inner panel assembly according to claim 6, characterized in that: The depth of the recessed portion is greater than the opening width of the recessed portion on the first end surface of the tailgate stay reinforcement.

8. A vehicle, characterized in that: It comprises the back door inner panel assembly as described in any one of claims 4 to 7.

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