Automobile threshold reinforcing structure and using method thereof

Abstract

The invention belongs to the technical field of automobile body corrosion prevention and installation collision, and particularly relates to an automobile doorsill reinforcing structure which comprises a doorsill outer plate, a doorsill inner plate and a reinforcing structural part, the reinforcing structural part is arranged between the doorsill outer plate and the doorsill inner plate, and a flow guide structure is arranged on the reinforcing structural part; the diversion ribs are crossed to form a net-shaped channel, so that electrophoresis liquid can be guided to dead corners of the cavity, and air bags are reduced; the liquid storage groove is in an electric field weak area, so that the retention time of the electrophoresis liquid can be prolonged; the metal plate is connected with the conductive coating and the threshold metal wall to realize potential balance; the structural holes in the metal plate can discharge nearby air bags, so that the situation that the electrophoresis liquid is in contact with the wall surface of a cavity is prevented from being hindered by air; and local missed coating is prevented. The invention further provides a using method for the automobile doorsill reinforcing structure, and operators can understand and use the automobile doorsill reinforcing structure conveniently.

Description

Technical Field

[0001] This invention belongs to the field of automotive body corrosion protection technology, specifically, this invention relates to automotive door sill reinforcement structure. Background Technology

[0002] In the field of automotive body structure technology, the door sill area, as a critical part connecting the front and rear of the vehicle body and supporting lateral loads, directly determines the overall safety and service life of the vehicle body through its structural strength and corrosion resistance. Currently, mainstream door sill structures generally adopt a three-layer composite design consisting of an outer panel, an inner panel, and a central reinforcing component, which are connected together by welding to form a closed or semi-closed cavity structure. This complex cavity structure restricts the flow of the electrophoretic coating liquid within the cavity, resulting in poor electrophoretic permeability. This can easily lead to "dead zones"—thin paint films, missed areas, or even complete lack of paint coverage—in areas deep within the cavity, at corners, and along weld edges.

[0003] Chinese Patent (Publication No.: 115092266A) discloses a car door sill reinforcement structure, a car door sill, and a car. The car door sill reinforcement structure is used for installation between the inner and outer panels of the door sill beam. It includes a reinforcing sheet, longitudinal reinforcing ribs, and transverse reinforcing ribs. The extending direction of the reinforcing sheet matches the extending direction of the outer panel of the door sill beam. One end of the reinforcing sheet is used to connect to the outer panel of the door sill beam, and the other end is used to connect to the inner panel of the door sill beam through the longitudinal and transverse reinforcing ribs. The longitudinal and transverse reinforcing ribs are arranged intersectingly. However, during electrophoretic coating, the flow of the electrophoretic liquid within the cavity is limited, making it difficult to fully wet all inner surfaces. Summary of the Invention

[0004] This invention is made to solve the above-mentioned problems, and its purpose is to provide a car door sill reinforcement structure that improves the flowability of electrophoretic fluid. To achieve the above purpose, the technical solution adopted by this invention is as follows: a car door sill reinforcement structure, including an outer door sill plate, an inner door sill plate and a reinforcement structural member, wherein a cavity is formed between the outer door sill plate and the inner door sill plate, the reinforcement structural member is disposed in the cavity, and a flow guiding structure is provided on the reinforcement structural member.

[0005] The flow guiding structure includes flow guiding ribs, which are disposed on the reinforcing structural member and extend to the end of the cavity. The flow guiding ribs form a Z-direction flow channel, and the reinforcing structural member is provided with an X-direction flow channel and a Y-direction flow channel.

[0006] The reinforcing structural component is provided with a flow-promoting cavity, and the flow-promoting cavity is provided with a spiral rib.

[0007] One end of the reinforcing structural member is provided with a liquid storage groove, which is circular or rectangular.

[0008] The reinforcing structural component is provided with a sheet metal, which is coated with a conductive coating. One end of the sheet metal is connected to the conductive coating, and the other end of the sheet metal abuts against the metal wall of the threshold.

[0009] A reinforcing rib is provided between the flow-promoting cavity and the reinforcing structural component. The flow-promoting cavity has a circular structure. The height of the spiral rib is 5%-10% of the diameter of the flow-promoting cavity. The orthographic projection of the spiral rib is at an angle of 10° to 30° with the horizontal plane.

[0010] The guide ribs are arranged in a crisscross pattern on the reinforcing structural component.

[0011] The sheet metal has structural holes that are evenly spaced on it. The diameter of each structural hole is 6 mm and the distance between adjacent structural holes is 15-35 mm.

[0012] The reinforcing structural components and guide ribs are glass fiber reinforced PA6 injection molded integral structures.

[0013] A method of using a car door sill reinforcement structure, specifically as follows: Step 101: Embed the sheet metal into the reinforcing structural component, ensuring one end of the sheet metal is connected to the conductive coating and the other end abuts against the metal sill wall. Step 102: The reinforced structural components are connected to the outer and inner sill plates by bolts, and the bolt connection torque is not less than 17 N.M.

[0014] The technical effects of this invention are as follows: By using glass fiber reinforced PA6 injection molding to integrally mold the reinforcing structural components and guide ribs, the high strength and high temperature resistance of the material ensure the rigidity of the threshold support. The cross-shaped guide ribs form a mesh channel, which can accurately guide the electrophoretic liquid to the dead corner of the cavity and reduce air pockets. The spiral ribs break the laminar flow of the electrophoretic liquid and promote mixing through the spiral structure. The reinforcing ribs can prevent the deformation of the flow cavity. The liquid storage groove in the weak electric field area can prolong the residence time of the electrophoretic liquid. The metal sheet metal connects the conductive coating and the metal wall of the threshold to achieve potential balance. The liquid storage groove and the metal sheet metal together improve the problem of thin paint film and missed coating in the weak electric field area. The structural holes on the metal sheet metal can also discharge nearby air pockets, avoid air obstructing the contact between the electrophoretic liquid and the cavity wall, and prevent local missed coating. Attached Figure Description

[0015] This manual includes the following figures, which illustrate the following: Figure 1 This is an exploded view of a car door sill reinforcement structure according to the present invention.

[0016] Figure 2 This invention relates to a car door sill reinforcement structure. Figure 1 Enlarged view of point A in the middle; Figure 3This is a front view of a car door sill reinforcement structure according to the present invention; Figure 4 This is a top view of a car door sill reinforcement structure according to the present invention; Figure 5 This is a side view of a car door sill reinforcement structure according to the present invention.

[0017] The following are marked in the figure: 1. Reinforcing structural component; 2. Flow guiding structure; 201. Flow guiding rib; 202. Z-direction flow channel; 203. X-direction flow channel; 204. Y-direction flow channel; 3. Flow promoting cavity; 301. Spiral rib; 4. Liquid storage groove; 5. Sheet metal; 6. Reinforcing rib; 7. Structural hole. Detailed Implementation

[0018] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation.

[0019] like Figures 1-5 As shown, a car door sill reinforcement structure includes an outer door sill plate, an inner door sill plate, and a reinforcing structural member 1. A cavity is formed between the outer door sill plate and the inner door sill plate, and the reinforcing structural member 1 is disposed within the cavity. A flow guiding structure 2 is provided on the reinforcing structural member 1. The outer door sill plate serves as the outer protective layer for the car door sill area, while the inner door sill plate is located inside the outer door sill plate, close to the vehicle interior space. The reinforcing structural member 1, disposed between the outer and inner door sill plates, directly enhances the deformation resistance of the door sill area. When the vehicle body is subjected to a side collision or load impact, the reinforcing structural member 1 can absorb and disperse the impact energy, preventing excessive deformation of the outer and inner door sill plates, while simultaneously enhancing the rigidity of the door sill area. The flow guiding structure 2, disposed on the reinforcing structural member 1, can improve electrophoretic coating pass-through and enhance the uniformity of paint film coverage.

[0020] The flow guiding structure 2 includes flow guiding ribs 201, which are disposed on the reinforcing structural component 1 and extend to the end of the cavity, forming a Z-direction flow channel 202. The reinforcing structural component 1 is provided with X-direction flow channels 203 and Y-direction flow channels 204. The flow guiding ribs 201 guide the flow of the electrophoretic liquid, breaking up flow blind zones and preventing missed coatings or excessively thin paint films. In the deep cavity where the electric field is weak, the flow guiding ribs 201 can guide sufficient electrophoretic liquid to circulate, ensuring that enough electrophoretic paint particles participate in the electrodeposition reaction in that area, enhancing the corrosion resistance of the vehicle body. The flow guiding ribs 201 can also serve as a reinforcing structure, improving the overall rigidity of the reinforcing structural component 1. The flow guiding ribs 201 can increase the structural strength of the reinforcing structural component 1 and reduce its deformation probability under vehicle body stress. The Z-direction flow channel 202 opens up a vertical liquid flow channel, enabling the electrophoretic liquid to flow continuously in the upper and lower areas of the cavity. The X-direction flow channel 203 opens up a liquid flow path in the X direction of the vehicle body, enabling bidirectional flow of the electrophoretic liquid in the front and rear areas of the cavity, promoting the circulation and renewal of the electrophoretic liquid. The Y-direction flow channel 204 opens up a Y-direction liquid flow channel, enabling the electrophoretic liquid to flow between the inner and outer walls of the cavity, covering the inner side of the sill outer panel, the outer side of the inner panel, and both sides of the reinforcing structural components. The Z-direction flow channel 202, X-direction flow channel 203, and Y-direction flow channel 204 form a three-dimensional flow channel network, allowing the electrophoretic liquid to flow omnidirectionally within the cavity, resulting in higher electrophoretic throughput. The electrophoretic liquid flows without dead corners within the cavity, avoiding restricted flow and missed areas. Simultaneously, the multi-directional flow channels assist in venting, eliminating the impact of air resistance on electrophoresis, improving the circulation efficiency of the electrophoretic liquid, and ensuring uniform paint film thickness in all areas of the cavity.

[0021] A flow-promoting cavity 3 is provided on the reinforcing structural component 1, and a spiral rib 301 is provided inside the flow-promoting cavity 3. The circular cavity structure of the flow-promoting cavity 3 collects the electrophoretic liquid, forming a local liquid flow buffer space to avoid transient wetting caused by the rapid flow of electrophoretic liquid through the cavity. The flow-promoting cavity 3 provides a mounting carrier for the spiral rib 301. The flow direction is constrained by the boundary of the flow-promoting cavity 3. The spiral rib 301 disturbs the flow state of the electrophoretic liquid, transforming laminar flow into vortex flow and promoting the mixing of electrophoretic liquid. When the electrophoretic liquid comes into contact, the spiral rib 301 transforms the axial flow force into a composite force of axial and circumferential forces, generating a directional torsional force that disrupts the laminar parallel flow layer, causing transverse shear force between fast and slow electrophoretic liquids and allowing them to penetrate each other, gradually transitioning to vortex flow. As the electrophoretic liquid flows, the torsional force accumulates to form a continuous vortex, which not only drives the fresh electrophoretic liquid in the center to move towards the wall and entrains the aged electrophoretic liquid into the center to achieve longitudinal mixing, but also allows the vortex to exist continuously along the length of the cavity due to the continuous spiral structure, promoting transverse mixing of electrophoretic liquid at different positions. The spiral structure guides the liquid flow along the cavity wall, extending the contact path between the electrophoretic solution and the inner wall of the deep cavity, thus improving the wettability.

[0022] One end of the reinforcing structural component 1 is provided with a liquid storage groove 4, which can be circular or rectangular. The liquid storage groove 4 is a recessed groove set in the weak electric field area. It can create a liquid flow retention effect through the liquid storage groove 4, forcibly accumulating the originally rapidly flowing electrophoretic liquid in the liquid storage groove 4, thus prolonging the residence time of the electrophoretic liquid. This solves the problem of insufficient supply caused by the excessively rapid flow of electrophoretic liquid in the weak electric field area, providing a continuous raw material for the electrodeposition reaction. Moreover, the accumulated electrophoretic liquid forms a local high-concentration area in the liquid storage groove 4, improving the reaction efficiency. The circular shape of the liquid storage groove 4 avoids the local paint film accumulation caused by the electrophoretic liquid accumulating in the liquid storage groove 4. The circular inner wall of the liquid storage groove 4 guides the electrophoretic liquid to circulate slowly, reducing the unevenness of ion concentration. The rectangular liquid storage groove 4 directionally accumulates the electrophoretic liquid, guiding the electrophoretic liquid to flow directly into the liquid storage groove 4; the rectangular corners can fit with the contour of the cavity dead corners, guiding the electrophoretic liquid to cover the right-angle dead corners.

[0023] A metal sheet 5 is mounted on the reinforcing structural component 1. A conductive coating is sprayed onto the metal sheet 5. One end of the metal sheet 5 is connected to the conductive coating, and the other end abuts against the metal wall of the threshold. The electric potential of the threshold metal wall is transferred to the conductive coating through the metal sheet 5, and then diffuses from the conductive coating to the reinforcing structural component 1 and the surrounding area. This effectively eliminates the electric field shielding caused by non-metallic reinforcing components in the traditional threshold enclosed cavity, increases the electric field strength in the weak electric field area, achieves potential balance throughout the entire threshold cavity, and eliminates the electric field shielding effect.

[0024] A reinforcing rib 6 is provided between the flow-promoting cavity 3 and the reinforcing structural component 1. The flow-promoting cavity 3 has a circular structure, and the height of the spiral rib 301 is 5%-10% of the diameter of the flow-promoting cavity 3. The orthographic projection of the spiral rib 301 is at an angle of 10° to 30° with the horizontal plane. The reinforcing rib 6 distributes the force of the spiral rib 301 to the body of the reinforcing structural component 1, preventing cracking and deformation at the root of the spiral rib 301 due to stress concentration, ensuring that the spiral rib 301 always maintains a complete spiral shape, thereby stably maintaining the vortex effect. The flow-promoting cavity 3 is a circular structure designed to provide a uniform flow field environment for the turbulence effect of the spiral rib 301. The height of the spiral rib 301 is 5%-10% of the diameter of the flow-promoting cavity 3 to avoid insufficient turbulence. If the height is less than 5%, the turbulence intensity of the spiral rib 301 on the electrophoretic solution is insufficient to break the laminar flow. A height of 5%-10% allows the spiral rib 301 to effectively insert into the core area of ​​the liquid flow, transforming laminar flow into vortex flow. If the height is greater than 10%, the spiral rib 301 occupies too much space in the flow channel, increasing the resistance to electrophoretic solution flow, resulting in slow electrophoretic solution renewal in the deep cavity region and ion concentration imbalance. The orthographic projection of the spiral rib 301 is at an angle of 10°~30° to the horizontal plane. The spiral angle of 10°~30° can guide the electrophoretic solution to spirally rise or fall along the wall of the flow-promoting cavity 3, ensuring full wetting of the inner wall of the deep cavity while avoiding paint film accumulation caused by excessive turbulence.

[0025] The guide ribs 201 are arranged crosswise on the reinforcing structural component 1. The crosswise arrangement of the guide ribs 201 on the reinforcing structural component 1 forms a mesh-like flow channel. The guide ribs 201 can divert the electrophoretic liquid from the cavity inlet end to the surrounding area, covering the surface of the reinforcing structural component 1. The guide ribs 201 can guide the electrophoretic liquid to the corners and far ends of the threshold cavity, avoiding localized incomplete coating caused by the electrophoretic liquid flowing in only one direction. At the same time, the crosswise arrangement of the guide ribs 201 can improve the structural strength of the reinforcing structural component 1 itself, and the bending resistance of the reinforcing structural component 1 is better.

[0026] The metal sheet 5 has structural holes 7, which are evenly spaced and have a diameter of 6mm. The spacing between adjacent structural holes 7 is 15-35mm. During the electrophoretic coating process, air in the cavity can easily form tiny air pockets near the metal sheet 5. The evenly spaced structural holes 7 serve as channels for air to escape, allowing these air pockets to be discharged with the electrophoretic liquid. This prevents air from obstructing the contact between the electrophoretic liquid and the cavity wall, thus preventing localized missed coating. When the diameter of the structural holes 7 is 6mm and the spacing between adjacent structural holes 7 is 15-35mm, the metal sheet 5 is made of PA material, which provides the optimal locking force.

[0027] The reinforcing structural component 1 and the guide rib 201 are integrally injection molded structures made of glass fiber reinforced PA6. The reinforcing structural component 1 and the guide rib 201 are integrally injection molded structures made of glass fiber reinforced PA6. The glass fiber reinforced PA6 material has high strength, high temperature resistance and good impact resistance, which can ensure that the reinforcing structural component 1 is not easily deformed when it bears the role of supporting the sill. At the same time, the connection between the guide rib 201 and the reinforcing structural component 1 is more secure.

[0028] A method of using a car door sill reinforcement structure, specifically as follows: Step 101: Embed the metal sheet 5 into the reinforcing structural member 1, and connect one end of the metal sheet 5 to the conductive coating, and the other end of the metal sheet 5 abuts against the threshold metal wall. By embedding and fixing the metal sheet 5 and connecting both ends of the metal sheet 5 to the conductive coating and the threshold metal wall respectively, the conductive link between the conductive coating, the metal sheet 5 and the threshold metal wall is ensured to be complete and the resistance is low. This effectively eliminates the electric field shielding caused by the non-metallic reinforcing member in the traditional threshold closed cavity. The metal sheet 5 increases the electric field strength in the weak electric field area, realizes the potential balance of the entire threshold cavity, and eliminates the electric field shielding effect. Step 102: The reinforcing structural component 1 is connected to the outer sill plate and the inner sill plate by bolts, and the bolt connection torque is not less than 17 N.M. The reinforcing structural component 1 is connected to the outer sill plate and the inner sill plate by bolts to form a joint load-bearing structure of the outer sill plate, the reinforcing structural component 1 and the inner sill plate, which improves the deformation resistance of the outer sill plate and the inner sill plate. The bolt torque of not less than 17 N.M can resist driving vibration and side collision load, and also match the material tolerance limit of glass fiber reinforced PA6.

[0029] By using glass fiber reinforced PA6 injection molding to integrally form the reinforced structural component 1 and the guide rib 201, the high strength and high temperature resistance of the material ensure the rigidity of the threshold support. The cross-shaped guide rib 201 forms a mesh channel, which can accurately guide the electrophoretic liquid to the dead corner of the cavity and reduce air pockets. The spiral rib 301 breaks the laminar flow of the electrophoretic liquid and promotes mixing through the spiral structure. The reinforcing rib 6 can prevent the deformation of the flow-promoting cavity 3. The liquid storage groove 4 can prolong the residence time of the electrophoretic liquid in the weak electric field area. The metal sheet 5 connects the conductive coating and the metal wall of the threshold to achieve potential balance. The liquid storage groove 4 and the metal sheet 5 together improve the problem of thin paint film and missed coating in the weak electric field area. The structural holes 7 on the metal sheet 5 can also discharge the nearby air pockets, prevent air from hindering the contact between the electrophoretic liquid and the cavity wall, and prevent local missed coating.

[0030] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A car door sill reinforcement structure, characterized in that, It includes an outer sill plate, an inner sill plate, and a reinforcing structural member (1). A cavity is formed between the outer sill plate and the inner sill plate. The reinforcing structural member (1) is disposed in the cavity and a flow guiding structure (2) is provided on the reinforcing structural member (1).

2. The car door sill reinforcement structure according to claim 1, characterized in that: The flow guiding structure (2) includes a flow guiding rib (201), which is disposed on the reinforcing structural member (1). The flow guiding rib (201) extends to the end of the cavity and forms a Z-direction flow channel (202). The reinforcing structural member (1) is provided with an X-direction flow channel (203) and a Y-direction flow channel (204).

3. The car door sill reinforcement structure according to claim 2, characterized in that: The reinforcing structural member (1) is provided with a flow-promoting cavity (3), and a spiral rib (301) is provided inside the flow-promoting cavity (3).

4. The car door sill reinforcement structure according to claim 3, characterized in that: One end of the reinforcing structural member (1) is provided with a liquid storage groove (4), which is circular or rectangular.

5. The car door sill reinforcement structure according to claim 4, characterized in that: The reinforcing structural member (1) is provided with a metal sheet (5), the metal sheet (5) is coated with a conductive coating, one end of the metal sheet (5) is connected to the conductive coating, and the other end of the metal sheet (5) abuts against the threshold metal wall.

6. The automobile door sill reinforcement structure according to any one of claims 3 to 5, characterized in that: A reinforcing rib (6) is provided between the flow-promoting cavity (3) and the reinforcing structural member (1). The flow-promoting cavity (3) is a circular structure. The height of the spiral rib (301) is 5%-10% of the diameter of the flow-promoting cavity (3). The orthographic projection of the spiral rib (301) is at an angle of 10°~30° to the horizontal plane.

7. The automobile door sill reinforcement structure according to any one of claims 2 to 5, characterized in that: The guide ribs (201) are arranged crosswise on the reinforcing structural member (1).

8. The automobile door sill reinforcement structure according to claim 5, characterized in that: The metal sheet (5) is provided with structural holes (7), which are equally spaced on the metal sheet (5). The diameter of the structural holes (7) is 6mm, and the spacing between adjacent structural holes (7) is 15-35mm.

9. The automobile door sill reinforcement structure according to claims 2 to 5, characterized in that: The reinforcing structural component (1) and the guide rib (201) are glass fiber reinforced PA6 injection molded integral structures.

10. A method of using a car door sill reinforcement structure according to any one of claims 1 to 9, characterized in that, Specifically: Step 101: Embed the sheet metal (5) into the reinforcing structural member (1), and connect one end of the sheet metal (5) to the conductive coating, with the other end of the sheet metal (5) abutting against the metal wall of the threshold. Step 102: Strengthen the structural component (1) and connect it to the outer sill plate and the inner sill plate by bolts. The bolt connection torque shall not be less than 17 N.M.

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