Underbody protection plate and vehicle

Abstract

This application provides a chassis guard plate and a vehicle, relating to the field of automotive parts technology. The chassis guard plate includes: a chassis guard plate body, which is a discontinuous fiber-reinforced thermoplastic composite sheet; and a chassis guard plate reinforcing layer, disposed on the surface of the chassis guard plate body, which is a continuous fiber-reinforced thermoplastic composite sheet. The chassis guard plate provided by this application has high structural strength, good rigidity, strong impact resistance, and is not easily damaged.

Description

Technical Field

[0001] This application relates to the field of automotive parts technology, and in particular to a skid plate and vehicle. Background Technology

[0002] As a protective structure installed on the vehicle chassis, the underbody protection plate is used to protect the chassis and the powertrain installed on the chassis. It also makes a significant contribution to reducing wind resistance and noise reduction.

[0003] Because the underbody protection plate is located at the bottom of the vehicle, it is easily damaged by road obstacles or flying stones and gravel. Therefore, the design of the underbody protection plate usually has certain strength requirements. For bottom protection and wind resistance reduction, the higher the rigidity of the underbody protection plate, the better. However, although existing underbody protection plates can meet basic requirements, damage still occurs frequently after being subjected to greater impacts or wading through water. Utility Model Content

[0004] This application provides a bottom protection plate and a vehicle. The bottom protection plate has high structural strength, good rigidity, strong impact resistance, and is not easily damaged.

[0005] One aspect of this application provides a bottom protection plate, comprising: a bottom protection plate body, which is a discontinuous fiber-reinforced thermoplastic composite board; and a bottom protection plate reinforcing layer, disposed on the surface of the bottom protection plate body, which is a continuous fiber-reinforced thermoplastic composite board.

[0006] The bottom protection plate provided in this application uses a discontinuous fiber-reinforced thermoplastic composite sheet as the main body and adds a continuous fiber-reinforced thermoplastic composite sheet as a reinforcing layer. The reinforcing layer is disposed on the surface of the main body, and the two together constitute the bottom protection plate. This allows for flexible design of the main body structure by leveraging the good molding performance of the discontinuous fiber-reinforced thermoplastic composite material, thereby enhancing its structural strength. Simultaneously, the high strength of the continuous fiber-reinforced thermoplastic composite material improves the impact resistance of the bottom protection plate. Therefore, the combination of the two creates a bottom protection plate with high structural strength and strong impact resistance, significantly improving its resistance to damage.

[0007] In one possible implementation, the bottom guard plate body is an injection molded part, and the bottom guard plate reinforcement layer is integrally molded on the surface of the bottom guard plate body.

[0008] In this way, the resulting bottom guard plate is a one-piece molded component, resulting in better overall integrity and higher structural strength, which further enhances its impact resistance. During long-term use, the bottom guard plate exhibits higher reliability and a longer service life.

[0009] In one possible implementation, the underbody reinforcement layer is located on the side of the underbody body facing away from the chassis.

[0010] This design allows for greater flexibility in the construction of the main body of the underbody protection plate. Positioning the main body of the underbody protection plate towards the chassis facilitates its connection to the chassis. Furthermore, the underbody protection plate reinforcement layer exhibits higher flatness; positioning it away from the chassis improves the overall appearance of the underbody protection plate.

[0011] In one possible implementation, the bottom guard plate body includes a main body and a reinforcing structure, the reinforcing structure protruding on the side surface of the main body opposite to the reinforcing layer of the bottom guard plate.

[0012] In this way, the reinforcing structure protrudes onto the main body, increasing the surface area of ​​the bottom guard plate. This reinforcing structure locally thickens the bottom guard plate, enhancing its structural strength. Consequently, the bottom guard plate formed by the combination of the main body and the reinforcing layer has even higher structural strength and greater impact resistance.

[0013] Furthermore, by making the reinforcing structure protrude on the side of the main body away from the underbody reinforcement layer, the reinforcing structure will not affect the bonding between the underbody body and the underbody reinforcement layer, and the underbody can be installed on the vehicle body using the reinforcing structure.

[0014] In one possible implementation, the thickness of the motherboard body is 1.5mm-3.0mm.

[0015] In this way, the main body has sufficient thickness to meet the processing requirements of the bottom guard plate and ensure the basic structural strength of the bottom guard plate. Furthermore, the thickness of the main body is not excessive, allowing enough space to design reinforcement structures. The overall height and weight of the bottom guard plate are relatively small, facilitating its installation at the bottom of the chassis and contributing to the overall thinness and lightness of the bottom guard plate.

[0016] In one possible implementation, the reinforcing structure includes reinforcing ribs.

[0017] The reinforcing ribs protrude on the surface of the main body on the side away from the bottom protective plate reinforcement layer. The reinforcing ribs make the bottom protective plate body locally thicker, mainly to increase the structural strength of the bottom protective plate body.

[0018] In one possible implementation, the wall thickness of the reinforcing rib is 1 / 3 to 2 / 3 of the thickness of the main body, and the protrusion height of the reinforcing rib is 4 to 6 times the wall thickness of the reinforcing rib.

[0019] In this way, the reinforcing ribs have sufficient wall thickness to meet the requirements of the injection molding process. The injection fluid can flow into the cavity of the reinforcing rib in the injection mold to form the required reinforcing rib. The reinforcing ribs have sufficient protrusion height, which significantly thickens the main body of the bottom guard plate, effectively enhancing the structural strength of the main body of the bottom guard plate. At the same time, the protrusion height of the reinforcing ribs is not too large, so as not to affect the strength of the reinforcing ribs themselves.

[0020] In one possible implementation, the reinforcing structure also includes a mounting boss.

[0021] In this way, the mounting boss not only enhances the structural strength of the underbody protection plate, but also serves as a mounting base structure, enabling the underbody protection plate to be installed on the vehicle body.

[0022] In one possible implementation, the bottom liner reinforcement layer comprises multiple layers of continuous fiber-reinforced thermoplastic unidirectional tapes stacked sequentially.

[0023] In this way, the thickness requirements of the bottom liner reinforcement layer can be met by stacking continuous fiber thermoplastic unidirectional tapes. Furthermore, the higher fiber content in the bottom liner reinforcement layer results in better toughness and stronger shear resistance, effectively enhancing the structural strength of the bottom liner and significantly improving its impact resistance.

[0024] In one possible implementation, the partially continuous fiber reinforced thermoplastic unidirectional tape is laid in a first direction, and the partially continuous fiber reinforced thermoplastic unidirectional tape is laid in a second direction, with the first direction and the second direction being perpendicular to each other.

[0025] In this way, the unidirectional strip laid along the first direction can resist the component of the external force in the first direction, and the unidirectional strip laid along the second direction can resist the component of the external force in the second direction. Therefore, the bottom liner reinforcement layer has a good resistance and buffering effect against external forces transmitted in any direction in its planar direction, and the bottom liner reinforcement layer can resist external force impacts in all directions.

[0026] In one possible implementation, the first direction is the length direction of the vehicle body, and the second direction is the width direction of the vehicle body.

[0027] In one possible implementation, continuous fiber-reinforced thermoplastic unidirectional tape laid along a first direction and continuous fiber-reinforced thermoplastic unidirectional tape laid along a second direction are alternately arranged.

[0028] In this way, the unidirectional strips in the bottom protective plate reinforcement layer are laid more regularly, which is conducive to improving the stress balance of the bottom protective plate reinforcement layer.

[0029] In one possible implementation, the thickness of the continuous fiber reinforced thermoplastic unidirectional tape is 0.15mm-0.4mm, and the thickness of the bottom protective plate reinforcement layer is 0.3mm-1.0mm.

[0030] In one possible implementation, the fiber content in the bottom liner reinforcement layer is 30%wt-70%wt.

[0031] The fiber content can be specifically set according to the performance requirements of the bottom liner. This ensures that the reinforcing layer of the bottom liner can effectively improve the overall structural strength of the bottom liner, while also controlling the cost of the bottom liner.

[0032] In one possible implementation, the fibers in the bottom liner reinforcement layer include at least one of glass fiber and carbon fiber.

[0033] In one possible implementation, the resin in both the bottom liner body and the bottom liner reinforcement layer is polypropylene, polyamide, or polyethylene terephthalate.

[0034] In this way, the main body and reinforcing layer of the bottom panel use the same resin matrix. During the molding of the bottom panel, the main body and reinforcing layer are in a molten state at the joint. Applying a certain amount of pressure will cause the main body and reinforcing layer to form a good bond. This enhances the connection strength between the main body and reinforcing layer, improving the overall consistency and integrity of the bottom panel.

[0035] Another aspect of this application provides a vehicle including the underbody protection plate as described above.

[0036] The vehicle provided in this application, having included the aforementioned underbody protection plate, possesses all the technical effects of an underbody protection plate, which will not be elaborated here. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 A cross-sectional view of the bottom protective plate provided in the embodiments of this application;

[0039] Figure 2 This is a partial structural diagram of the bottom protective plate provided in an embodiment of this application.

[0040] Explanation of reference numerals in the attached figures:

[0041] 100-bottom guard plate;

[0042] 110 - Bottom guard plate main body;

[0043] 111-Main board body; 112-Reinforcing structure;

[0044] 112a - Reinforcing rib; 112b - Mounting boss;

[0045] 120 - Bottom protective plate reinforcement layer. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] This application provides a vehicle, which can refer to a large car, a small car, a special-purpose vehicle, etc. For example, according to vehicle type, the car in this application can be a sedan, an off-road vehicle, a multi-purpose vehicle (MPV), or other types of vehicles.

[0048] Vehicles typically consist of wheels, a power source, and a transmission system between the wheels and the power source. The transmission system transmits the power provided by the power source to the wheels, causing them to rotate and thus driving the vehicle.

[0049] It should be noted that the type of power source of the vehicle is not limited in the embodiments of this application. For example, for fuel vehicles, the power source can refer to fuel engines such as gasoline engines and diesel engines; for electric vehicles, the power source can refer to electric motors; for hybrid vehicles, the power source can refer to engines or electric motors; for vehicles powered by other means, the power source can refer to devices that generate power.

[0050] As described in the background section, vehicle chassis are equipped with underbody protection plates. These plates, located beneath the chassis, protect the chassis and powertrain from impacts from road obstacles, flying stones, and gravel. Furthermore, underbody protection plates significantly contribute to reducing wind resistance and noise reduction.

[0051] Currently, there are two main solutions for underbody protection plates used on vehicles: one is injection molding using PP+EPDM-TD20, and the other is compression molding using LWRT (Light weight reinforced thermoplastic).

[0052] The first option, PP+EPDM-TD20, uses polypropylene (PP) as the matrix, mixed with ethylene propylene diene monomer (EPDM), and talc (TD) as the reinforcement to form a composite material. EPDM is a terpolymer of ethylene, propylene, and a non-conjugated diene. TD20 represents a talc content of 20% by weight.

[0053] This composite material has good flowability, making it suitable for injection molding. However, its mechanical properties are relatively poor. When using this composite material to make bottom guard plates, the performance requirements are generally met by increasing the thickness of the bottom guard plate and designing reinforcing ribs on it. However, bottom guard plates made from this composite material are still at risk of damage.

[0054] The second approach involves using glass fiber and polypropylene fiber as raw materials, forming a composite material through processes such as carding, web laying, needle punching, and hot pressing. Generally, LWRT is first fabricated into sheets, then molded into the designed components. LWRT possesses relatively good strength and rigidity, but components made using the molding process cannot be reinforced with ribs, nor can their mounting points be locally strengthened. Furthermore, the fibers in LWRT are still discontinuous (the fibers are intermittently arranged in the component's extension direction). Therefore, bottom plates made using LWRT are also susceptible to damage.

[0055] In view of this, the embodiments of this application improve the vehicle's underbody protection plate by using a discontinuous fiber-reinforced thermoplastic composite sheet as the main body of the underbody protection plate and adding a continuous fiber-reinforced thermoplastic composite sheet as a reinforcing layer. The reinforcing layer is disposed on the surface of the main body of the underbody protection plate, and the two together constitute the underbody protection plate. This allows for flexible design of the main body structure of the underbody protection plate by utilizing the good molding performance of the discontinuous fiber-reinforced thermoplastic composite material, thereby enhancing its structural strength. Simultaneously, the high strength of the continuous fiber-reinforced thermoplastic composite material can be utilized to improve the impact resistance of the underbody protection plate. Therefore, the combination of the two results in a underbody protection plate with high structural strength and strong impact resistance, greatly improving its resistance to damage.

[0056] The bottom protective plate provided in the embodiments of this application will be described in detail below.

[0057] Figure 1 This is a cross-sectional view of the bottom protective plate provided in an embodiment of this application. (Refer to...) Figure 1As shown in the embodiment of this application, the bottom protective plate 100 includes a bottom protective plate body 110 and a bottom protective plate reinforcing layer 120. The bottom protective plate body 110 can serve as the main structure of the bottom protective plate 100, and the bottom protective plate reinforcing layer 120 is disposed on the surface of the bottom protective plate body 110. The two together constitute the bottom protective plate 100.

[0058] The bottom protective plate body 110 can be a discontinuous fiber-reinforced thermoplastic composite board. That is, the bottom protective plate body 110 can be a board made of discontinuous fiber-reinforced thermoplastic composite material. As the name suggests, discontinuous fiber-reinforced thermoplastic composite material is thermoplastic resin filled with fibers. In other words, this composite material uses thermoplastic resin as the matrix and fibers as the filler.

[0059] Typically, thermoplastic resins used as the matrix have low strength, while fibers used as fillers are brittle and have high rigidity. In reinforced composites obtained by filling fibers into thermoplastic resins, the fibers bear significant load stresses, while the matrix resin supports the fibers by transmitting external loads through shear stresses at the fiber interface.

[0060] Discontinuous fiber-reinforced thermoplastic composites, due to the addition of fibers to the thermoplastic resin, exhibit better toughness and stronger shear resistance, thus enhancing the structural strength of the composite material. Consequently, the bottom liner body 110 made from discontinuous fiber-reinforced thermoplastic composites possesses high structural strength and good reliability.

[0061] Furthermore, as the name suggests, in discontinuous fiber-reinforced thermoplastic composites, the fibers used as fillers have a discontinuous configuration. That is, in the direction of fiber extension, the fibers are arranged discontinuously and intermittently within the thermoplastic resin matrix. The discontinuous arrangement of fibers gives the composite good flowability and allows for greater freedom in its molding process.

[0062] In this way, the composite material molded sheet can be flexibly designed, and the structure of the bottom guard plate body 110 can be designed according to requirements to enhance the structural strength of the bottom guard plate body 110. Furthermore, while meeting the overall shape and size design requirements of the bottom guard plate 100, the overall strength and rigidity of the bottom guard plate 100 are enhanced, and the overall reliability of the bottom guard plate 100 is improved.

[0063] The bottom liner reinforcement layer 120 can be a continuous fiber reinforced thermoplastic composite sheet. That is, the bottom liner reinforcement layer 120 can be a sheet made of continuous fiber reinforced thermoplastic composite material. As the name suggests, continuous fiber reinforced thermoplastic composite material is also a thermoplastic resin filled with fibers. In other words, this composite material uses thermoplastic resin as the matrix and fibers as the filler.

[0064] Similar to discontinuous fiber-reinforced thermoplastic composites, continuous fiber-reinforced thermoplastic composites also involve filling fibers into thermoplastic resin to create a reinforced composite. The fibers bear significant load stress, and the shear stress at the interface between the matrix resin and the fibers helps the fibers transfer external loads. Continuous fiber-reinforced thermoplastic composites exhibit good toughness and strong shear resistance, enhancing the structural strength of the composite material. Therefore, the bottom liner reinforcement layer 120, made from continuous fiber-reinforced thermoplastic composites, possesses high structural strength and good reliability.

[0065] Unlike discontinuous fiber-reinforced thermoplastic composites, continuous fiber-reinforced thermoplastic composites use fibers as fillers in a continuous configuration. That is, the fibers extend continuously in one direction within the thermoplastic resin matrix along their elongation direction. This unidirectional continuous fiber extension results in better toughness, stronger shear resistance, and higher structural strength in the composite. Compared to discontinuous fiber-reinforced composites, continuous fiber-reinforced composites exhibit superior mechanical properties. Therefore, the bottom liner reinforcement layer 120, made from continuous fiber-reinforced thermoplastic composites, possesses higher structural strength and greater impact resistance.

[0066] The bottom guard plate 100 provided in this embodiment uses a discontinuous fiber-reinforced thermoplastic composite sheet as the main body 110, and adds a continuous fiber-reinforced thermoplastic composite sheet as the reinforcing layer 120, which is disposed on the surface of the main body 110. In this way, the discontinuous fiber-reinforced thermoplastic composite material has good formability, allowing for flexible design of the structure of the main body 110 to enhance its structural strength. Furthermore, the continuous fiber-reinforced thermoplastic composite sheet added to the surface of the main body 110 as the reinforcing layer 120 has excellent mechanical properties. Combining these two elements forms a bottom guard plate 100 with high structural strength and strong impact resistance, greatly improving its resistance to damage. This reduces the risk of breakage, improves its reliability, and extends its service life.

[0067] Because discontinuous fiber-reinforced thermoplastic composites have good flowability, they can be manufactured into sheets using injection molding to form the bottom guard plate body 110. In other words, the bottom guard plate body 110 can be an injection-molded part. This allows for the design of injection molds based on the structural requirements of the bottom guard plate body 110, ensuring that the bottom guard plate body 110 meets installation needs and has high structural strength.

[0068] Based on this, the bottom guard reinforcement layer 120 can be integrally molded onto the surface of the bottom guard body 110. Thus, the resulting bottom guard 100 is a one-piece molded part. The bottom guard 100 has better overall integrity and higher structural strength, further improving its impact resistance. During long-term use, the bottom guard 100 exhibits higher reliability and a longer service life.

[0069] For example, molding processes such as compression molding, secondary molding, and insert injection molding can be used to fabricate the bottom guard plate 100. Specifically, a continuous fiber-reinforced thermoplastic composite sheet can be provided first, heated (e.g., to approximately 230°C), and then compression molded into a bottom guard plate reinforcing layer 120. After molding, the bottom guard plate reinforcing layer 120 is quickly transferred to an injection mold, serving as an insert. Finally, a discontinuous fiber-reinforced thermoplastic composite material is injected into the injection mold, held under pressure, and cooled to form the bottom guard plate body 110. This achieves the integral molding of the bottom guard plate reinforcing layer 120 onto the bottom guard plate body 110, resulting in a one-piece bottom guard plate 100.

[0070] After providing the continuous fiber reinforced thermoplastic composite sheet, heating and molding the composite sheet allows the bottom protective plate reinforcement layer 120 to be immediately injection molded after its temperature rises. This improves the bonding strength between the bottom protective plate body 110 and the bottom protective plate reinforcement layer 120, resulting in a bottom protective plate 100 with better overall integrity and higher reliability. Furthermore, heating and molding the composite sheet creates microstructures such as pits and protrusions on its surface, increasing the contact area between the bottom protective plate reinforcement layer 120 and the bottom protective plate body 110, which also facilitates their bonding.

[0071] Regarding the mounting orientation of the underbody protection plate 100 at the bottom of the vehicle body, the main body 110 of the underbody protection plate can face the chassis, while the reinforcing layer 120 of the underbody protection plate can be located on the side surface of the main body 110 facing away from the chassis. The underbody protection plate 100 can be connected to the chassis via the main body 110, and the side surface of the reinforcing layer 120 facing away from the main body 110 serves as the outer surface of the underbody protection plate 100.

[0072] Among these advantages, the discontinuous fiber-reinforced thermoplastic composite material exhibits good formability. When injection molding is used to fabricate the main body 110 of the bottom guard plate, the structure of the main body 110 can be flexibly designed, facilitating the connection between the main body 110 and the chassis. Meanwhile, due to the superior mechanical properties of the continuous fiber-reinforced thermoplastic composite material, when compression molding is used to fabricate the reinforcing layer 120 of the bottom guard plate, the reinforcing layer 120 exhibits higher flatness, thus improving the appearance of the bottom guard plate 100.

[0073] Furthermore, the resin used as the matrix in the main body 110 of the bottom protector plate and the resin used as the matrix in the reinforcing layer 120 of the bottom protector plate can be made of the same resin material. Thus, when the main body 110 of the bottom protector plate is integrally molded onto the reinforcing layer 120, since both the main body 110 and the reinforcing layer 120 use the same resin matrix, the joint between them is molten. Applying a certain amount of pressure will allow the main body 110 and the reinforcing layer 120 to form a good bond. This enhances the connection strength between the main body 110 and the reinforcing layer 120, improving the overall consistency and integrity of the bottom protector plate 100. Consequently, it improves the impact resistance of the bottom protector plate 100, resulting in higher reliability and a longer service life.

[0074] For example, the resin in the bottom panel body 110 and the resin in the bottom panel reinforcing layer 120 can be polypropylene (PP), polyamide (PA), or polyethylene terephthalate (PET).

[0075] For example, both the resin in the base plate body 110 and the resin in the base plate reinforcing layer 120 are polypropylene. Polypropylene is a semi-crystalline thermoplastic with good mechanical properties and high impact resistance. Using polypropylene as the matrix resin in the base plate body 110 and the base plate reinforcing layer 120 ensures that the base plate 100 as a whole has good impact resistance. Furthermore, adding discontinuous fibers to the base plate body 110 and continuous fibers to the base plate reinforcing layer 120 further enhances the overall impact resistance of the base plate 100. Moreover, polypropylene has a lower cost, which helps reduce the overall production cost of the base plate 100.

[0076] Of course, provided that the bonding force between the bottom protective plate body 110 and the bottom protective plate reinforcing layer 120 can be guaranteed, the bottom protective plate body 110 and the bottom protective plate reinforcing layer 120 can also use different resins as the matrix, and this application embodiment does not limit this.

[0077] Taking polypropylene as an example, the non-continuous fiber reinforced thermoplastic composite material used to make the bottom panel body 110 can be PP+EPDM-TD20. PP+EPDM-TD20 uses polypropylene as the resin matrix, mixes ethylene propylene diene monomer (EPDM) into the polypropylene, and adds talc powder (TD) as a reinforcing agent, with a talc powder weight content of 20%. Among them, talc powder can enhance the tensile strength of the composite material, enhance the surface hardness and scratch resistance of the composite material, and improve the stiffness of the composite material.

[0078] Discontinuous fiber reinforced thermoplastic composites can also be PP-GF30, which is a glass fiber (GF) reinforced polypropylene composite with a glass fiber content of 30% by weight. Alternatively, discontinuous fiber reinforced thermoplastic composites can also be PP-GF40, which is a glass fiber reinforced polypropylene composite with a glass fiber content of 40% by weight.

[0079] The fibers in the bottom protective plate reinforcing layer 120 can be glass fiber, or the fibers in the bottom protective plate reinforcing layer 120 can be carbon fiber, or the fibers in the bottom protective plate reinforcing layer 120 can include both glass fiber and carbon fiber. This application does not specifically limit these aspects.

[0080] Furthermore, the fiber content in the bottom protective plate reinforcing layer 120 can be between 30% wt and 70% wt, and can be specifically set according to the performance requirements of the bottom protective plate 100. This ensures that the bottom protective plate reinforcing layer 120 can effectively improve the overall structural strength of the bottom protective plate 100, while also controlling the cost of the bottom protective plate 100. For example, the fiber content in the bottom protective plate reinforcing layer 120 can be 35% wt, 40% wt, 45% wt, 50% wt, 55% wt, 60% wt, 65% wt, etc.

[0081] Figure 2 This is a partial structural diagram of the bottom protective plate provided in an embodiment of this application. (In conjunction with...) Figure 1 and Figure 2 As shown, the bottom guard plate body 110 may include a main body 111 and a reinforcing structure 112. The main body 111 serves as the main support structure of the bottom guard plate body 110, and the main body 111 may be flat. The reinforcing structure 112 is integrally formed on the main body 111, and the reinforcing structure 112 protrudes from the main body 111.

[0082] Taking advantage of the good flowability of discontinuous fiber reinforced thermoplastic composite materials, when the bottom guard plate body 110 is formed by injection molding, the injection mold is designed so that the bottom guard plate body 110 formed by injection molding has a raised reinforcing structure 112.

[0083] The reinforcing structure 112 protrudes from the main body 111, increasing the surface area of ​​the bottom protective plate body 110. The reinforcing structure 112 locally thickens the bottom protective plate body 110, enhancing its structural strength. Consequently, the bottom protective plate 100 formed by the combination of the bottom protective plate body 110 and the bottom protective plate reinforcing layer 120 has higher structural strength and stronger impact resistance. Furthermore, the protruding reinforcing structure 112 can also be used as a mounting structure for the bottom protective plate 100.

[0084] The surface of the underbody panel 110 facing the underbody panel reinforcement layer 120 is the plane of the main body 111. This facilitates the integral molding of the underbody panel 110 onto the underbody panel reinforcement layer 120, ensuring the bonding strength between the underbody panel 110 and the underbody panel reinforcement layer 120. The reinforcement structure 112 can protrude from the surface of the main body 111 facing away from the underbody panel reinforcement layer 120. The reinforcement structure 112 will not affect the bonding between the underbody panel 110 and the underbody panel reinforcement layer 120, and the underbody panel 110 can also be mounted to the vehicle body using the reinforcement structure 112.

[0085] As for the reinforcing structure 112 formed on the bottom protective plate body 110, combined with Figure 1 and Figure 2 As shown, the reinforcing structure 112 may include a reinforcing rib 112a. The reinforcing rib 112a protrudes from the surface of the main body 111 on the side away from the bottom protective plate reinforcing layer 120, and the reinforcing rib 112a is mainly used to increase the structural strength of the bottom protective plate body 110.

[0086] For example, the reinforcing rib 112a can be a slender strip structure. The reinforcing rib 112a extends along the length and width directions of the bottom protective plate body 110 and is interwoven into a mesh to enhance the overall and uniform structural strength of the bottom protective plate body 110.

[0087] Building upon this, the reinforcing structure 112 may further include a mounting boss 112b, which also protrudes from the surface of the main body 111 on the side facing away from the underbody reinforcement layer 120. While enhancing the structural strength of the underbody body 110, the mounting boss 112b also serves as a mounting base structure to allow the underbody 100 to be mounted on the vehicle body. For example, the mounting boss 112b can be a circular, rectangular, or polygonal boss protruding from the surface of the main body 111. The mounting boss 112b has mounting holes that can penetrate between the underbody body 110 and the underbody reinforcement layer 120. Bolts, screws, and other fasteners are inserted into the mounting holes to secure the underbody 100 to the vehicle body.

[0088] For example, a plurality of mounting protrusions 112b can be formed on the underbody 110, and the mounting protrusions 112b are distributed at different locations in the planar direction of the underbody 110. In this way, different locations in the planar direction of the underbody 100 can be connected to the vehicle body. The underbody 100 has multiple and dispersed mounting points, ensuring stable and reliable installation on the vehicle body. Furthermore, the plurality of mounting protrusions 112b reinforce the structural strength of different locations of the underbody 110, resulting in greater structural strength of the underbody 110 and reinforcement of all parts of the underbody 100 as a whole, eliminating any structural weaknesses in the underbody 100.

[0089] In the bottom protective plate body 110, the thickness t1 of the main body 111 (see...) Figure 1 (As shown) The thickness can be between 1.5mm and 3.0mm. This ensures that the main body 111 has sufficient thickness to meet the processing requirements of the underbody protection plate body 110, while also guaranteeing the basic structural strength required by the underbody protection plate body 110. At the same time, the thickness of the main body 111 is not too large, allowing more space to be reserved on the surface of the main body 111 to form the reinforcing structure 112. Furthermore, the overall height space occupied by the underbody protection plate body 110 is relatively small, making it easy to install the underbody protection plate 100 at the bottom of the vehicle chassis. In addition, the overall thinness and light weight of the underbody protection plate body 110 contribute to the overall thinness and lightness of the underbody protection plate 100.

[0090] For example, the thickness t1 of the motherboard body 111 can be 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, etc.

[0091] The wall thickness t2 of stiffener 112a (see...) Figure 1 (As shown) can be 1 / 3 to 2 / 3 of the thickness t1 of the main body 111. In this way, the reinforcing rib 112a has sufficient wall thickness, and the injection mold forms sufficient space at the reinforcing rib 112a to meet the requirements of the injection molding process. The injection fluid can flow into the cavity of the reinforcing rib 112a in the injection mold to form the required reinforcing rib 112a. Furthermore, the wall thickness of the reinforcing rib 112a will not be too large, which helps to reduce the production cost of the protective plate body. Sufficient space can also be reserved between the reinforcing ribs 112a to avoid interference with certain structures of the chassis.

[0092] For example, the wall thickness t2 of the reinforcing rib 112a can be half the thickness t1 of the main body 111. Taking the thickness of the main body 111 as an example of 2.2mm, the wall thickness t2 of the reinforcing rib 112a can be 1.1mm.

[0093] The protrusion height h of reinforcing rib 112a (see...) Figure 1 (As shown) can be 4 to 6 times the wall thickness t2 of the reinforcing rib 112a. In this way, the reinforcing rib 112a has sufficient protrusion height, and the reinforcing rib 112a clearly protrudes from the surface of the main body 111. The reinforcing rib 112a has a significant effect of locally thickening the bottom protective plate body 110, effectively enhancing the structural strength of the bottom protective plate body 110. At the same time, the protrusion height of the reinforcing rib 112a is not too large, so as not to affect the strength of the reinforcing rib 112a itself, ensuring the stability and reliability of the reinforcing rib 112a.

[0094] For example, the protrusion height h of the reinforcing rib 112a can be 5 times the wall thickness t2 of the reinforcing rib 112a. Taking a wall thickness t2 of the reinforcing rib 112a of 1.1 mm as an example, the protrusion height h of the reinforcing rib 112a can be 5.5 mm.

[0095] As for the specific composition of the bottom protective plate reinforcing layer 120, the bottom protective plate reinforcing layer 120 may include multiple layers of continuous fiber thermoplastic unidirectional tapes stacked sequentially. In other words, continuous fiber thermoplastic unidirectional tapes can be formed first, and then the layers of continuous fiber thermoplastic unidirectional tapes can be stacked sequentially, and after heating and molding, the bottom protective plate reinforcing layer 120 can be formed.

[0096] The bottom protective plate reinforcement layer 120 is constructed by setting multiple layers of continuous fiber thermoplastic unidirectional tapes. The thickness requirement of the bottom protective plate reinforcement layer 120 can be met by stacking the continuous fiber thermoplastic unidirectional tapes. Furthermore, because the bottom protective plate reinforcement layer 120 contains multiple layers of continuous fiber thermoplastic unidirectional tapes, the fiber content in the bottom protective plate reinforcement layer 120 is higher, resulting in better toughness and stronger shear resistance. This effectively enhances the structural strength of the bottom protective plate 100 and significantly improves its impact resistance.

[0097] Based on this, in the multi-layer continuous fiber reinforced thermoplastic unidirectional tape (hereinafter referred to as unidirectional tape) of the bottom protective plate reinforcing layer 120, different unidirectional tapes can have different laying directions. The continuous fibers in the unidirectional tape extend unidirectionally in a specific direction; for example, the continuous fibers extend along the length direction of the unidirectional tape. The laying direction of the unidirectional tape corresponds to the extension direction of the continuous fibers in the unidirectional tape.

[0098] Unidirectional tape exhibits a more pronounced shear resistance in the direction of continuous fiber extension, i.e., in the laying direction. In other words, unidirectional tape is primarily stronger in its laying direction, providing better resistance to external forces along this direction. Conversely, its impact resistance is relatively weaker perpendicular to the laying direction, making it less resistant to external forces perpendicular to this direction.

[0099] By varying the laying directions of the different unidirectional tapes in the bottom liner reinforcement layer 120, the extension directions of the continuous fibers within each tape differ. This results in the strongest shear resistance and impact resistance of each unidirectional tape being concentrated in different directions. Consequently, the bottom liner reinforcement layer 120 can resist external forces from different directions using these different unidirectional tapes, making it more comprehensive in its impact resistance. Therefore, the bottom liner 100 exhibits higher structural strength and better impact resistance, providing more all-around protection against external impacts.

[0100] In some embodiments, in the bottom protective plate reinforcement layer 120, a portion of the unidirectional strips are laid in a first direction, and a portion of the unidirectional strips are laid in a second direction, with the first and second directions perpendicular to each other. Thus, any impact force transmitted along the plane of the bottom protective plate reinforcement layer 120 can be decomposed into a component force along the first direction and a component force along the second direction. The unidirectional strips laid along the first direction can resist and buffer the component force along the first direction, and the unidirectional strips laid along the second direction can resist and buffer the component force along the second direction. Therefore, the bottom protective plate reinforcement layer 120 has a good resistance and buffering effect against external forces transmitted in any direction along its plane, and the bottom protective plate reinforcement layer 120 can resist external impacts from all directions.

[0101] The first direction can be the length direction of the vehicle body; in the unidirectional strip laid along the first direction, the direction in which the continuous fibers extend is the length direction of the vehicle body. The second direction can be the width direction of the vehicle body; in the unidirectional strip laid along the second direction, the direction in which the continuous fibers extend is the width direction of the vehicle body.

[0102] In applications requiring higher impact resistance, in addition to unidirectional strips laid along the first and second directions, the bottom protective plate reinforcement layer can also have unidirectional strips laid in other directions. For example, the bottom protective plate reinforcement layer 120 also has unidirectional strips laid along a third direction, with the angles between the third direction and the first direction, and between the third direction and the second direction, both being 45°. This diversifies the laying directions of the unidirectional strips in the bottom protective plate reinforcement layer 120, further enhancing its impact resistance and improving the bottom protective plate 100's ability to resist external impacts.

[0103] Taking the bottom liner reinforcement layer 120, which includes unidirectional strips laid along a first direction and unidirectional strips laid along a second direction, as an example, the unidirectional strips laid along the first direction and the unidirectional strips laid along the second direction can be alternately arranged. This makes the laying of the unidirectional strips in the bottom liner reinforcement layer 120 more regular, which is beneficial to improving the stress balance of the bottom liner reinforcement layer 120. Furthermore, the consistency of the bottom liner reinforcement layer 120 is better, and the overall reliability and durability of the bottom liner 100 are higher.

[0104] The thickness of each unidirectional strip can be between 0.15mm and 0.4mm. This provides the unidirectional strip with a sufficient thickness to meet its machinability requirements. Simultaneously, the thickness of the unidirectional strip is not excessive; even with multiple layers of unidirectional strips, the bottom protective plate reinforcing layer 120 maintains a relatively small thickness. This facilitates the integral molding of the bottom protective plate reinforcing layer 120 and the bottom protective plate body 110, resulting in a bottom protective plate 100 with a moderate overall thickness, meeting the installation requirements of the bottom protective plate 100.

[0105] For example, the thickness of a unidirectional tape can be 0.17mm, 0.20mm, 0.22mm, 0.25mm, 0.27mm, 0.30mm, 0.32mm, 0.35mm, 0.37mm, etc.

[0106] The overall thickness t3 of the bottom protective plate reinforcement layer 120 (see) Figure 1 (As shown) The thickness can be between 0.3mm and 1.0mm. This results in a thinner bottom plate reinforcement layer 120 with sufficient strength and high reliability. The bottom plate reinforcement layer 120 can be used as an insert, allowing the bottom plate body 110 to be integrally formed onto it.

[0107] For example, the overall thickness t3 of the bottom protective plate reinforcement layer 120 can be 0.40mm, 0.45mm, 0.50mm, 0.55mm, 0.60mm, 0.65mm, 0.70mm, 0.75mm, 0.80mm, 0.85mm, 0.90mm, 0.95mm, etc.

[0108] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0109] It should be noted that the embodiments referred to in the specification, such as "one embodiment," "embodiment," "exemplary embodiment," and "some embodiments," may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A kick plate characterized in that, include: The main body of the bottom protective plate is a discontinuous fiber-reinforced thermoplastic composite board. The bottom protective plate reinforcement layer is disposed on the surface of the bottom protective plate body and is a continuous fiber reinforced thermoplastic composite board.

2. The underguard of claim 1, wherein, The bottom guard plate body is an injection molded part, and the bottom guard plate reinforcing layer is integrally formed on the surface of the bottom guard plate body.

3. The underguard of claim 1, wherein, The bottom guard plate reinforcement layer is located on the surface of the bottom guard plate body on the side away from the chassis.

4. The underpan according to any one of claims 1-3, characterized in that The bottom protective plate body includes a main body and a reinforcing structure, wherein the reinforcing structure protrudes from the surface of the main body on the side away from the reinforcing layer of the bottom protective plate.

5. The underpan according to claim 4, characterized in that The thickness of the motherboard body is 1.5mm-3.0mm.

6. The bottom protective plate according to claim 4, characterized in that, The reinforcing structure includes reinforcing ribs.

7. The bottom protective plate according to claim 6, characterized in that, The wall thickness of the reinforcing rib is 1 / 3 to 2 / 3 of the thickness of the main body, and the protrusion height of the reinforcing rib is 4 to 6 times the wall thickness of the reinforcing rib.

8. The bottom protective plate according to claim 4, characterized in that, The reinforcing structure also includes mounting bosses.

9. The bottom protective plate according to any one of claims 1-3, characterized in that, The bottom protective plate reinforcement layer comprises multiple layers of continuous fiber-reinforced thermoplastic unidirectional tapes stacked sequentially.

10. The bottom protective plate according to claim 9, characterized in that, The continuous fiber reinforced thermoplastic unidirectional tape is laid in a first direction in some parts, and in a second direction in others, with the first direction and the second direction being perpendicular to each other.

11. The bottom protective plate according to claim 10, characterized in that, The first direction is the length direction of the vehicle body, and the second direction is the width direction of the vehicle body.

12. The bottom protective plate according to claim 10, characterized in that, The continuous fiber-reinforced thermoplastic unidirectional tape laid along the first direction and the continuous fiber-reinforced thermoplastic unidirectional tape laid along the second direction are alternately arranged in sequence.

13. The bottom protective plate according to claim 9, characterized in that, The thickness of the continuous fiber reinforced thermoplastic unidirectional tape is 0.15mm-0.4mm, and the thickness of the bottom protective plate reinforcement layer is 0.3mm-1.0mm.

14. The bottom protective plate according to any one of claims 1-3, characterized in that, The fiber content in the bottom protective plate reinforcement layer is 30%wt-70%wt.

15. The bottom protective plate according to any one of claims 1-3, characterized in that, The fibers in the bottom protective plate reinforcement layer include at least one of glass fiber and carbon fiber.

16. The bottom protective plate according to any one of claims 1-3, characterized in that, The resin in both the main body of the bottom protective plate and the reinforcing layer of the bottom protective plate is polypropylene, polyamide, or polyethylene terephthalate.

17. A vehicle, characterized in that, Includes the bottom guard plate as described in any one of claims 1-16.

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