Engine cover plate, preparation method thereof and vehicle

Abstract

The embodiment of the invention provides an engine cover plate and a preparation method thereof and a vehicle, the engine cover plate is prepared by laying blended yarns formed by mixing regenerated carbon fibers and thermoplastic fibers, and the engine cover plate comprises a plurality of area structures, the laying angle of the blended yarns in at least one regional structure is set differently from the laying angle of the blended yarns in the remaining regional structures. The technical problems that in the prior art, a carbon fiber composite material engine cover plate is high in material cost and not beneficial to pedestrian protection are solved.

Description

Technical Field

[0001] This application relates to the technical field of engine cover preparation, specifically to an engine cover, its preparation method, and a vehicle. Background Technology

[0002] With the rapid development of automotive lightweighting technology, the engine hood, as a key body panel, has become a focus of industry attention due to its material and manufacturing process innovations. Carbon fiber composites, with their superior specific strength and specific modulus, are considered an ideal choice for achieving automotive lightweighting and enhancing structural performance.

[0003] Currently, carbon fiber composite engine covers mainly adopt inner and outer plate structures and sandwich structures, which not only have high material costs, but also excessive structural strength and stiffness, which are not conducive to pedestrian protection.

[0004] There is currently no good solution to the technical problems of high material cost and poor pedestrian protection associated with existing carbon fiber composite engine cover technology. Summary of the Invention

[0005] This application provides an engine cover plate, its preparation method, and a vehicle, to at least solve the technical problems of high material cost and poor pedestrian protection in existing carbon fiber composite engine cover plates.

[0006] According to one aspect of the present application, an engine cover is provided, which is prepared by layup of blended yarn formed by mixing recycled carbon fiber and thermoplastic fiber, wherein the engine cover includes multiple regional structures, and the layup angle of the blended yarn in at least one regional structure is set differently from the layup angle of the blended yarn in the other regional structures.

[0007] Furthermore, at least one regional structure includes multiple layers of blended yarn layup, multiple blended yarn layup hot-pressed, and a thermoplastic resin film is provided between two adjacent blended yarn layup; and / or, a thermoplastic resin film is provided on the outer surface of the outermost or innermost blended yarn layup.

[0008] Furthermore, the multiple regional structures include a central region located on the engine cover, the central region comprising multiple layers of blended yarn lay-up, wherein the lay-up directions of the blended yarns in adjacent layers of blended yarn lay-up are perpendicular to each other.

[0009] Furthermore, the multiple regional structures include a side edge region located on the engine cover, the side edge region comprising multiple layers of blended yarn layup, the layup directions of the blended yarns in adjacent layers of blended yarn layup being perpendicular to each other, the side edge region having a B layup disposed near the outermost A layup of the central region, the layup direction of the blended yarns in the B layup being set at a 45° angle to the layup direction of the blended yarns in the A layup.

[0010] Furthermore, the multiple regional structures include a hinge mounting area located on the engine cover, the hinge mounting area comprising multiple layers of blended yarn lay-ups, the lay-up directions of the blended yarns in adjacent layers of blended yarn lay-ups being perpendicular to each other, the hinge mounting area having a C lay-up disposed near the outermost A lay-up of the central region, the lay-up direction of the blended yarns in the C lay-up being perpendicular to the lay-up direction of the blended yarns in the A lay-up.

[0011] Furthermore, the blended yarn layup in the central region is made of the first blended yarn, the blended yarn layup in the side edge region is made of the second and third blended yarns, and the blended yarn layup in the hinge mounting region is made of the third blended yarn. The mass percentage of recycled carbon fiber in the first blended yarn is less than the mass percentage of recycled carbon fiber in the second blended yarn, and the mass percentage of recycled carbon fiber in the second blended yarn is less than the mass percentage of recycled carbon fiber in the third blended yarn.

[0012] Furthermore, the mass of recycled carbon fiber in the first blended yarn accounts for 17% to 23% of the total mass of recycled carbon fiber and thermoplastic fiber, the mass of recycled carbon fiber in the second blended yarn accounts for 37% to 43% of the total mass of recycled carbon fiber and thermoplastic fiber, and the mass of recycled carbon fiber in the third blended yarn accounts for 57% to 63% of the total mass of recycled carbon fiber and thermoplastic fiber.

[0013] Furthermore, the thermoplastic fiber includes one or more of polypropylene, polyamide, and polyethylene terephthalate.

[0014] According to another aspect of the embodiments of this application, a method for preparing an engine cover plate is also provided. The method is used to prepare the engine cover plate described above and includes the following steps: Step S1, mixing raw materials including recycled carbon fiber and thermoplastic fiber to obtain a blended sliver; Step S2, processing the blended sliver using axial twisting and radial winding processes to obtain a blended yarn; Step S3, performing a layup process on the blended yarn according to a preset layup angle to obtain a blended yarn layup; Step S4, performing a hot pressing molding process on the blended yarn layup to obtain the engine cover plate.

[0015] According to another aspect of the embodiments of this application, a vehicle is also provided, the vehicle including an engine cover, the engine cover being the engine cover described above, and / or the engine cover being prepared using the preparation method described above.

[0016] In this embodiment, the engine cover is prepared by layup of blended yarns formed from recycled carbon fiber and thermoplastic fiber. Compared with virgin carbon fiber, recycled carbon fiber is not only lower in cost, but its recycling also meets the needs of sustainable development. The engine cover includes multiple regional structures, and the layup angle of the blended yarns in at least one regional structure is set differently from that in the other regional structures. The selection of the layup angle optimizes the mechanical response of the material in multiple directions, ensuring a stable energy absorption effect under impact from different directions. This helps to disperse the impact force during a collision, reduce the risk of hard rebound, and thus reduce injury to pedestrians. The engine cover in the above solution solves the technical problems of high material cost and poor pedestrian protection in existing carbon fiber composite engine covers. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 This is a structural schematic diagram of the engine cover plate in this application;

[0019] Figure 2 This is a cross-sectional view of the central region of the engine cover in this application along the AA direction;

[0020] Figure 3 This is a cross-sectional view along the BB direction of the side edge region of the engine cover in this application;

[0021] Figure 4 This is a cross-sectional view along the CC direction of the hinge mounting area of ​​the engine cover in this application.

[0022] The above figures include the following reference numerals:

[0023] 1. Central region;

[0024] 2. Side edge area;

[0025] 3. Hinge mounting area;

[0026] 4. First blended yarn;

[0027] 5. Second blended yarn;

[0028] 6. Third blended yarn. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0032] Combination Figures 1 to 4 As shown, according to a specific embodiment of this application, an engine cover is provided.

[0033] Specifically, the engine cover is made of a blended yarn layer formed by mixing recycled carbon fiber and thermoplastic fiber. The engine cover includes multiple regional structures, and the layup angle of the blended yarn in at least one regional structure is set differently from the layup angle of the blended yarn in the other regional structures.

[0034] In this embodiment, the engine cover is prepared by layup of blended yarns formed from recycled carbon fiber and thermoplastic fiber. Compared with virgin carbon fiber, recycled carbon fiber is not only lower in cost, but its recycling also meets the needs of sustainable development. The engine cover includes multiple regional structures, and the layup angle of the blended yarns in at least one regional structure is set differently from that in the other regional structures. The selection of the layup angle optimizes the mechanical response of the material in multiple directions, ensuring a stable energy absorption effect under impact from different directions. This helps to disperse the impact force during a collision, reduce the risk of hard rebound, and thus reduce injury to pedestrians. The engine cover in the above solution solves the technical problems of high material cost and poor pedestrian protection in existing carbon fiber composite engine covers.

[0035] Furthermore, at least one regional structure includes multiple layers of blended yarn layup, multiple blended yarn layup hot-pressed, and a thermoplastic resin film is provided between two adjacent blended yarn layup; and / or, a thermoplastic resin film is provided on the outer surface of the outermost or innermost blended yarn layup.

[0036] In the embodiments of this application, the provision of a thermoplastic resin film can enhance the interlayer bonding of the composite material. That is, the thermoplastic resin flows under heating pressure, completely impregnates the fiber, improves the interfacial bonding between the fiber and the matrix, reduces porosity, thereby improving the mechanical properties and durability of the composite material. It can also prevent microcracks and delamination that may occur between fibers, ensuring that the composite material maintains excellent physical and chemical properties during long-term use.

[0037] Specifically, a thermoplastic resin film is provided between two adjacent blended yarn layups, a thermoplastic resin film is provided on the outer surface of the outermost blended yarn layup, and a thermoplastic resin film is provided on the outer surface of the innermost blended yarn layup.

[0038] Furthermore, the multiple regional structures include a central region 1 located on the engine cover, the central region 1 comprising multiple layers of blended yarn lay-up, wherein the lay-up directions of the blended yarns in adjacent blended yarn lay-up layers are perpendicular to each other.

[0039] In the embodiments of this application, in the central region 1 of the engine cover, the layup directions of the blended yarns in the two adjacent blended yarn layup layers are perpendicular to each other, and the blended yarns in the two adjacent blended yarn layup layers intersect perpendicularly to form a grid structure. The composite material has weak mechanical properties perpendicular to the fiber direction, while the orthogonal layup can compensate for the difference in mechanical properties in different directions, thereby improving the bending strength and stiffness of this region. At the same time, the orthogonal layup design can evenly distribute stress and avoid local damage or failure caused by stress concentration in a certain direction.

[0040] like Figure 1 , Figure 2 As shown, the central region 1 includes multiple layers of blended yarn. The blended yarns in adjacent blended yarn layers are laid in a direction perpendicular to each other. For example, one layer of blended yarn in an adjacent blended yarn layer extends along the X-axis direction, and the other layer of blended yarn in an adjacent blended yarn layer extends along the Y-axis direction.

[0041] It should be noted that, Figure 2 The 0° shown represents the direction of the X-axis. Figure 3 The 90° shown represents the direction of the Y-axis.

[0042] Furthermore, the multiple regional structures include a side edge region 2 located on the engine cover plate. The side edge region 2 includes multiple layers of blended yarn lay-up. The lay-up directions of the blended yarns in adjacent blended yarn lay-up layers are perpendicular to each other. The side edge region 2 has a B lay-up set near the outermost A lay-up of the central region 1. The lay-up direction of the blended yarns in the B lay-up is set at a 45° angle to the lay-up direction of the blended yarns in the A lay-up.

[0043] In the embodiments of this application, in the side edge region 2 of the engine cover, the lay-up directions of the blended yarns in the two adjacent blended yarn lay-ups are perpendicular to each other, and the blended yarns in the two adjacent blended yarn lay-ups intersect perpendicularly to form a grid structure, which helps to enhance the bending strength and stiffness of this region; the lay-up direction of the blended yarns in the B lay-up forms a 45° angle with the lay-up direction of the blended yarns in the A lay-up, which helps to form a transition layer with composite mechanical properties in the side edge region 2, that is, to form a smooth transition between the high strength in the vertical and horizontal directions and the enhanced shear resistance in the 45° direction, thereby improving the overall stability of the engine cover under complex stress conditions.

[0044] like Figure 1 , Figure 3 As shown, the side edge region 2 extends circumferentially along the central region 1. This side edge region 2 includes multiple layers of blended yarn, with the yarn directions of adjacent blended yarn layers perpendicular to each other. For example, the extension direction of one layer of blended yarn in two adjacent blended yarn layers forms a 45° angle with the X-axis, and the extension direction of the other layer forms a -45° angle with the X-axis. The side edge region 2 also has a B layer located near the outermost A layer of the central region 1, with the yarn direction of the blended yarn in the B layer forming a 45° angle with the yarn direction of the blended yarn in the A layer.

[0045] It should be noted that, Figure 3 The 45° shown represents an angle of 45° with the X-axis. Figure 3 The -45° shown represents an angle of -45° with the X-axis.

[0046] Furthermore, the multiple regional structures include a hinge mounting area 3 located on the engine cover plate. The hinge mounting area 3 includes multiple layers of blended yarn lay-ups, with the lay-up directions of the blended yarns in adjacent layers of blended yarn lay-ups being perpendicular to each other. The hinge mounting area 3 has a C lay-up located near the outermost A lay-up of the central area 1, with the lay-up direction of the blended yarns in the C lay-up being perpendicular to the lay-up direction of the blended yarns in the A lay-up.

[0047] In the embodiments of this application, the hinge mounting area 3 is a critical connection part of the engine cover, bearing significant torque and dynamic loads. It employs a design with mutually perpendicular ply layers, where each layer of blended yarn provides additional support in two main directions, significantly enhancing the structural strength and rigidity of this area and ensuring the stability and reliability of the engine cover during opening and closing. The C-ply is laid perpendicular to the A-ply, further optimizing the mechanical properties of the hinge mounting area 3. This not only enhances tensile strength but also improves shear and torsional resistance, enabling the hinge mounting area 3 to withstand greater mechanical stress without damage during frequent opening and closing of the engine cover.

[0048] like Figure 1 , Figure 4 As shown, the hinge mounting area 3 is located in front of the central area 1. This hinge mounting area 3 includes multiple layers of blended yarn, with the blended yarns in adjacent layers laid perpendicular to each other. For example, one layer of blended yarn in two adjacent layers extends along the X-axis, and the other layer extends along the Y-axis. The hinge mounting area 3 also has a C layer located near the outermost A layer of the central area 1, with the blended yarns in the C layer laid perpendicular to the direction of the blended yarns in the A layer.

[0049] It should be noted that, Figure 4 The 0° shown represents the direction of the X-axis. Figure 4 The 90° shown represents the direction of the Y-axis.

[0050] Furthermore, the blended yarn layup in the central region 1 is made of the first blended yarn 4, the blended yarn layup in the side edge region 2 is made of the second blended yarn 5 and the third blended yarn 6, and the blended yarn layup in the hinge mounting region 3 is made of the third blended yarn 6. The mass percentage of recycled carbon fiber in the first blended yarn 4 is less than the mass percentage of recycled carbon fiber in the second blended yarn 5, and the mass percentage of recycled carbon fiber in the second blended yarn 5 is less than the mass percentage of recycled carbon fiber in the third blended yarn 6.

[0051] In the embodiments of this application, the central region 1, as the main stress-bearing area, is ply-laid with a first blended yarn 4 having a lower recycled carbon fiber content. This ply structure has a higher proportion of thermoplastic fibers, utilizing the toughness of thermoplastic materials to enhance the impact resistance and elastic modulus of this region. The side edge region 2 is ply-laid with a second blended yarn 5 and a third blended yarn 6. The increased recycled carbon fiber content improves the tensile strength and stiffness of the material. Simultaneously, the gradual increase in recycled carbon fiber content helps to create a progressive energy absorption process at the moment of impact, reducing the peak force during collision and minimizing injury to pedestrians. The hinge mounting region 3 uses the third blended yarn 6 with the highest recycled carbon fiber content. The high recycled carbon fiber content provides higher shear and torsional resistance, ensuring the hinge mounting region 3 remains stable even during long-term repeated opening and closing, preventing structural loosening or damage, and thus ensuring a secure connection between the engine hood and the vehicle body.

[0052] Specifically, based on finite element analysis of pedestrian protection and engine cover plate, the mechanical requirements of each area were determined, and a gradient layup design was adopted. The central area 1 is the collision energy absorption zone, and a first blended yarn 4 with a low recycled carbon fiber content is used for layup. The side edge area 2 serves as a transition zone, using alternating layups of a third blended yarn 6 with a high recycled carbon fiber content and a second blended yarn 5 with a medium recycled carbon fiber content; that is, in the side edge area 2, the layup structure formed by the third blended yarn 6 is adjacent to the layup structure formed by the second blended yarn 5. The hinge mounting area 3, as a high-rigidity area, uses a third blended yarn 6 with a high recycled carbon fiber content for layup.

[0053] like Figure 3 As shown, the second blended yarn 5 with a medium content of recycled carbon fiber is arranged adjacent to the outermost layup of the central region 1, so that the central region 1 and the side edge region 2 form a gradient layup, forming a progressive energy absorption structure, reducing the peak force during collision and reducing injury to pedestrians.

[0054] Furthermore, the mass of recycled carbon fiber in the first blended yarn 4 accounts for 17% to 23% of the total mass of recycled carbon fiber and thermoplastic fiber, the mass of recycled carbon fiber in the second blended yarn 5 accounts for 37% to 43% of the total mass of recycled carbon fiber and thermoplastic fiber, and the mass of recycled carbon fiber in the third blended yarn 6 accounts for 57% to 63% of the total mass of recycled carbon fiber and thermoplastic fiber.

[0055] In the embodiments of this application, the first blended yarn 4, the second blended yarn 5, and the third blended yarn 6 are designed with a reasonable mass ratio of recycled carbon fiber, which helps to achieve lightweight design, pedestrian protection design, cost control design, and gradient design of structural strength for the engine cover.

[0056] Furthermore, the thermoplastic fiber includes one or more of polypropylene, polyamide, and polyethylene terephthalate.

[0057] According to another specific embodiment of this application, a method for preparing an engine cover plate is also provided. The method is used to prepare the engine cover plate in the above embodiment, and the method includes the following steps:

[0058] Step S1 involves mixing raw materials, including recycled carbon fiber and thermoplastic fiber, to obtain a blended sliver.

[0059] The blended sliver obtained by mixing recycled carbon fiber and thermoplastic fiber not only makes full use of the high strength and lightweight properties of recycled carbon fiber, but also leverages the processing convenience and toughness advantages of thermoplastic fiber, achieving a comprehensive improvement in the performance of composite materials, including enhanced specific strength, specific modulus, and better impact resistance and recyclability.

[0060] For example, recycled carbon fiber accounts for 30% to 70% of the total mass of recycled carbon fiber and thermoplastic fiber.

[0061] Step S2 involves processing the blended sliver using axial twisting and radial wrapping techniques to obtain blended yarn.

[0062] The blended sliver is treated with axial twisting and radial wrapping processes to ensure the uniform distribution and high orientation of recycled carbon fibers in the yarn, thereby forming a blended yarn with excellent mechanical properties and structural stability. Axial twisting enhances the yarn's strength and abrasion resistance, while radial wrapping promotes tight bonding between fibers, improving the dimensional stability and fatigue resistance of the final product.

[0063] For example, the blended sliver is treated using an axial twisting-radial wrapping composite process to achieve 80-100 twists / meter and an orientation degree of over 85%.

[0064] Step S3: Lay the blended yarn according to the preset layup angle to obtain the blended yarn layup.

[0065] By layering blended yarns at preset angles, the performance of different areas of the engine cover can be optimized in a targeted manner. The choice of layer angle directly affects the mechanical properties of the material. Through reasonable design, such as orthogonal layering in the central area 1, oblique layering in the side edge area 2, and high-density layering in the hinge mounting area 3, the strength, stiffness, and shear resistance of the corresponding areas can be effectively improved, achieving both lightweight structure and refined functionality.

[0066] Step S4: The blended yarn layup is hot-pressed to obtain the engine cover plate.

[0067] The blended yarns, after being laid up at a preset angle, are cured and molded under certain temperature and pressure to form a high-strength, low-porosity composite material engine cover.

[0068] Furthermore, prior to step S1, the recycled carbon fiber needs to be cleaned.

[0069] Recycled carbon fiber originates from recycled materials and may contain residues from the original matrix (such as epoxy resin), oil, dust, and other impurities. These impurities not only reduce the mechanical properties of the fiber but also affect the bonding between the fiber and the thermoplastic matrix. Cleaning can effectively remove these impurities, improve the purity of the recycled carbon fiber, and thus ensure that its mechanical properties are close to or reach the level of virgin carbon fiber. At the same time, the clean fiber surface is more easily and uniformly wetted by thermoplastic resin, forming a strong interfacial bond, which is crucial for improving the overall performance of the composite material, such as tensile strength, shear strength, and fatigue performance.

[0070] In one exemplary embodiment of this application, a method for preparing an engine cover includes the following steps:

[0071] Step 1: Clean and dry the recycled carbon fiber obtained from pyrolysis or chemical recovery with deionized water.

[0072] Step 2: Mix the cleaned recycled carbon fiber with thermoplastic fiber and feed it into the cotton opening and cleaning machine for thorough mixing to form a blended sliver.

[0073] Step 3: Feed 6-8 blended slivers into a drawing frame, setting the draft ratio to 5.5-6.5. After multiple drawing and drafting passes, a uniformly oriented blended yarn is formed. The blended yarn includes L-type, M-type, and H-type yarns. The recycled carbon fiber content of the L-type yarn is 17%-23% by mass, the recycled carbon fiber content of the M-type yarn is 37%-43% by mass, and the recycled carbon fiber content of the H-type yarn is 57%-63% by mass.

[0074] Step 4: Using thermoplastic composite film lamination technology, the blended yarn is prepared into a thermoplastic prepreg tape. The layup design adopts a "sandwich" structure, with each layer of fabric covered on both the top and bottom sides with film. The fabric is made of blended yarns laid up at a certain angle.

[0075] Step 5: The prepared thermoplastic prepreg tape is laid up according to the CAE performance requirements of the engine cover. Specifically, L-shaped yarns are used for laying up in the collision energy absorption zone (central area 1), with a layup angle of [0° / 90° / 0° / 90°] and a thickness of about 1.5~2mm; M-shaped and H-shaped yarns are used alternately for laying up in the transition zone (side edge area 2), with a layup angle of [+45° / -45°] and a thickness of about 1.5mm; H-shaped yarns are used for laying up in the high stiffness area (hinge mounting area 3), with a layup angle of [0° / 90° / 0° / 90°].

[0076] Step 6: Place the laid-up car hood in a hot press for hot pressing to form an integrated thermoplastic composite engine hood.

[0077] According to another specific embodiment of this application, a vehicle is also provided, the vehicle including an engine cover, the engine cover being the engine cover in the above embodiment, and / or the engine cover being prepared using the preparation method in the above embodiment.

[0078] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0079] 1. Integrated material-structure-function design: Achieve "rigid-flexible transition" performance through the zoning of blended yarn proportions and gradient layup coupling.

[0080] 2. Low-cost and environmentally friendly approach: high-value utilization of recycled carbon fiber and closed-loop recycling of thermoplastic resin.

[0081] 3. Lightweight: Compared with traditional metal components, the weight is reduced by more than 50%.

[0082] 4. Pedestrian protection optimization: The collision energy absorption zone (central area 1) uses L-shaped blended yarn with low recycled carbon fiber content, which utilizes its large deformation characteristics to achieve "soft contact-slow rebound" dual-stage energy absorption.

[0083] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0084] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0085] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0086] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An engine cover, characterized in that, The engine cover is made of a blended yarn layer formed by mixing recycled carbon fiber and thermoplastic fiber. The engine cover includes multiple regional structures, and the layup angle of the blended yarn in at least one of the regional structures is different from the layup angle of the blended yarn in the other regional structures.

2. The engine cover plate according to claim 1, characterized in that, At least one of the said regional structures includes multiple layers of the blended yarn layup, the multiple blended yarn layups are hot-pressed, and a thermoplastic resin film is provided between two adjacent blended yarn layups; and / or, a thermoplastic resin film is provided on the outer surface of the outermost or innermost blended yarn layup.

3. The engine cover plate according to claim 1 or 2, characterized in that, The plurality of said regional structures include a central region located on the engine cover, the central region comprising multiple layers of said blended yarn lay-up, wherein the lay-up directions of the blended yarns in adjacent layers of said blended yarn lay-up are perpendicular to each other.

4. The engine cover plate according to claim 3, characterized in that, The plurality of said regional structures include a side edge region located on the engine cover plate, the side edge region comprising multiple layers of the blended yarn layup, the layup directions of the blended yarns in adjacent layers of the blended yarn layup being perpendicular to each other, the side edge region having a B layup disposed near the outermost A layup of the central region, the layup direction of the blended yarns in the B layup being set at a 45° angle to the layup direction of the blended yarns in the A layup.

5. The engine cover plate according to claim 4, characterized in that, The plurality of said regional structures include a hinge mounting area located on the engine cover, the hinge mounting area comprising multiple layers of the blended yarn layup, the layup directions of the blended yarns in adjacent layers of the blended yarn layup being perpendicular to each other, the hinge mounting area having a C layup disposed near the outermost A layup of the central region, the layup direction of the blended yarns in the C layup being perpendicular to the layup direction of the blended yarns in the A layup.

6. The engine cover plate according to claim 5, characterized in that, The blended yarn layer in the central region is made of a first blended yarn, the blended yarn layer in the side edge region is made of a second and a third blended yarn, and the blended yarn layer in the hinge mounting region is made of a third blended yarn. The mass percentage of recycled carbon fiber in the first blended yarn is less than the mass percentage of recycled carbon fiber in the second blended yarn, and the mass percentage of recycled carbon fiber in the second blended yarn is less than the mass percentage of recycled carbon fiber in the third blended yarn.

7. The engine cover plate according to claim 6, characterized in that, The recycled carbon fiber in the first blended yarn accounts for 17% to 23% of the total mass of the recycled carbon fiber and the thermoplastic fiber, the recycled carbon fiber in the second blended yarn accounts for 37% to 43% of the total mass of the recycled carbon fiber and the thermoplastic fiber, and the recycled carbon fiber in the third blended yarn accounts for 57% to 63% of the total mass of the recycled carbon fiber and the thermoplastic fiber.

8. The engine cover plate according to claim 1, characterized in that, The thermoplastic fiber includes one or more of polypropylene, polyamide, and polyethylene terephthalate.

9. A method for preparing an engine cover plate, the method being used to prepare the engine cover plate according to any one of claims 1-8, characterized in that, The preparation method includes the following steps: Step S1: Mix raw materials including recycled carbon fiber and thermoplastic fiber to obtain blended sliver; Step S2: The blended sliver is processed by axial twisting and radial wrapping to obtain blended yarn; Step S3: The blended yarn is laid up according to a preset layup angle to obtain the blended yarn layup. Step S4: The blended yarn layup is subjected to hot pressing molding to obtain the engine cover plate.

10. A vehicle, the vehicle including an engine cover, characterized in that, The engine cover is the engine cover as described in any one of claims 1-8, and / or the engine cover is prepared using the preparation method described in claim 9.

Images