Plastic part fixing structure and electric vehicle

Abstract

The application provides a plastic part fixing structure and an electric vehicle, and relates to the technical field of electric vehicles. The plastic part fixing structure comprises a support, a first shell and a second shell arranged along the extension direction of the support, and the first shell and the second shell are oppositely arranged along the wall thickness direction of the support in a cross section perpendicular to the extension direction of the support, and the first shell and the second shell jointly cover the support; any one of the first shell and the second shell is connected with the support to form an integral structure, and the second shell is fixedly connected with the first shell. The plastic part fixing structure improves the connection stability and improves the assembly efficiency.

Description

Technical Field

[0001] This application relates to the field of electric vehicle technology, and more particularly to a plastic part fixing structure and an electric vehicle. Background Technology

[0002] Driven by the demand for modern urban commuting and short-distance travel, the appearance design and structural functions of two-wheeled electric bicycles and electric motorcycles are becoming increasingly diversified.

[0003] U-shaped brackets, as vehicle decorative parts, are typically used to cover the vehicle frame structure and enhance the overall aesthetics of the vehicle, while also requiring a stable connection with the frame or supporting structure.

[0004] However, in the existing technology, the U-shaped bracket decorative parts for two-wheeled electric bicycles and electric motorcycles not only have low assembly efficiency, but also poor connection stability. Utility Model Content

[0005] In view of the above problems, this application provides a plastic fixing structure and an electric vehicle to solve the problems of low assembly efficiency and poor connection stability of the U-shaped bracket decorative parts of two-wheeled electric bicycles and electric motorcycles in the prior art.

[0006] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0007] A first aspect of this application provides a plastic part fixing structure, including:

[0008] A support, and a first housing and a second housing disposed along the extending direction of the support;

[0009] On a cross section perpendicular to the extension direction of the support, the first shell and the second shell are arranged opposite each other along the wall thickness direction of the support, and the first shell and the second shell together cover the support;

[0010] Either the first housing or the second housing is connected to the bracket to form an integral structure, and the second housing is fixedly connected to the first housing.

[0011] In one possible implementation, the first housing is disposed on the inner side of the bracket, and the first housing is connected to the bracket to form an integral structure; the second housing is disposed on the outer side of the bracket, and the second housing is fused together with the first housing by energy welding.

[0012] In one possible implementation, a first overlapping portion is provided on the periphery of the first housing, and a second overlapping portion is provided on the periphery of the second housing. Both the first overlapping portion and the second overlapping portion are provided along the extension direction of the support, and the first overlapping portion overlaps with the second overlapping portion.

[0013] The second shell and the first shell are fused together by energy welding to form a joint surface, which is set along the extension direction of the first overlap and the second overlap.

[0014] In one possible implementation, energy welding includes ultrasonic welding or laser welding.

[0015] In one possible implementation, the bracket includes a first connecting segment and second connecting segments connected to both ends of the first connecting segment, the two second connecting segments being arranged at an angle;

[0016] The plastic part fixing structure also includes a first connector and a second connector;

[0017] The first housing includes a first housing segment and a second housing segment connected to both ends of the first housing segment. The first housing segment is connected to the first connecting segment by a first connector, and the second housing segment is connected to the second connecting segment by a second connector.

[0018] In one possible implementation, a first through hole is provided on the first connecting segment; a second through hole is provided on the second connecting segment;

[0019] The first shell section is provided with a first boss, and a first threaded hole is provided on the first boss, which is opposite to the first through hole; the second shell section is provided with a second boss, and a second threaded hole is provided on the second boss, which is opposite to the second through hole.

[0020] The first connector passes through the first through hole and is threaded into the first threaded hole; the second connector passes through the second through hole and is threaded into the second threaded hole.

[0021] In one possible implementation, a first latch is provided at both ends of the first shell section; a second latch is provided at the end of the second shell section near the first shell section; the first latch and the second latch are locked together.

[0022] In one possible implementation, the first latch is provided with a first slot and a second slot; the second latch includes a first engaging portion and a second engaging portion, the first engaging portion being able to be inserted into the first slot and the second engaging portion being able to be inserted into the second slot.

[0023] The first latch is also provided with a locking platform, which is located at the opening of the first locking groove; one end of the first locking part is provided with a locking tongue, which can engage with the locking platform after the first locking part passes through the first locking groove.

[0024] In one possible implementation, the first boss includes a first stepped portion and a second stepped portion. The first stepped portion is connected to the first shell section, and the second stepped portion protrudes from the first stepped portion in a direction away from the first shell section. The second stepped portion is coaxially arranged with the first through hole and the first threaded hole, and the second stepped portion can be at least partially inserted into the first through hole.

[0025] In one possible implementation, a third boss is provided at the end of the second shell section away from the first shell section, and a third through hole is provided on the third boss.

[0026] The end of the second housing is provided with a column part opposite to the third boss, and a third threaded hole is provided on the column part, which is coaxial with the third through hole.

[0027] The plastic part fixing structure also includes a third connector, which passes through a third through hole and is threaded into a third threaded hole.

[0028] In one possible implementation, a positioning hole is provided on the first shell section; a positioning post is provided on the second shell section opposite to the positioning hole, and the positioning post is inserted into the positioning hole.

[0029] In one possible implementation, a stepped groove is also provided on the third boss, the stepped groove is coaxially arranged with the third through hole and the third threaded hole, and the stepped groove is provided at the end of the third boss facing the column part; the column part can be at least partially inserted into the stepped groove.

[0030] A second aspect of this application provides an electric vehicle, including the plastic part fixing structure as described above.

[0031] The plastic part fixing structure provided in this application allows the bracket to be assembled with either the first or second housing (taking the first housing as an example) during the manufacturing process, thereby firmly connecting them into a rigid sub-assembly. This avoids the possibility of relative displacement and collision between the bracket and the housing due to vibration, improving the connection stability. This operation can be completed very precisely and efficiently with the assistance of tooling fixtures. On the assembly line, this sub-assembly only needs to be aligned and fixed with the other housing (the second housing). This step-by-step assembly reduces the number of connection points that need to be aligned at once during assembly, reduces the difficulty and time of operation in confined spaces, improves assembly efficiency, and reduces production costs and assembly time.

[0032] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the plastic part fixing structure and electric vehicle provided by the embodiments of this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific implementation. Attached Figure Description

[0033] 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.

[0034] Figure 1 An exploded view of the plastic part fixing structure provided in the embodiments of this application;

[0035] Figure 2 A perspective view of the plastic part fixing structure provided in the embodiments of this application;

[0036] Figure 3 for Figure 2 The first cross-sectional view of the plastic part fixing structure shown;

[0037] Figure 4 for Figure 1 A perspective view of the bracket shown;

[0038] Figure 5 for Figure 1 A perspective view of the first housing shown;

[0039] Figure 6 for Figure 5 A magnified view of a portion of point A in the middle;

[0040] Figure 7 for Figure 5 A perspective view of the first shell segment shown;

[0041] Figure 8 for Figure 5 A perspective view of the second shell segment shown;

[0042] Figure 9 This is an assembly drawing of the first boss of the first shell section and the first through hole of the bracket;

[0043] Figure 10 for Figure 1 A perspective view of the second housing shown;

[0044] Figure 11 for Figure 10 A magnified view of a portion of point B in the middle;

[0045] Figure 12 for Figure 2 The second cross-sectional view of the plastic part fixing structure shown.

[0046] Explanation of reference numerals in the attached figures:

[0047] 10. Bracket; 11. First connecting section; 110. First through hole; 12. Second connecting section; 120. Second through hole;

[0048] 20. First housing; 201. First overlapping part;

[0049] 21. First shell section; 211. First boss; 2110. First threaded hole; 2111. First stepped portion; 2112. Second stepped portion; 212. First latch; 2121. First slot; 2122. Second slot; 2123. Locking platform; 213. Positioning hole;

[0050] 22. Second shell section; 221. Second boss; 2210. Second threaded hole; 222. Second latch; 2221. First snap-fit ​​part; 2222. Second snap-fit ​​part; 2223. Snap-fit ​​tongue; 223. Third boss; 2230. Third through hole; 2231. Stepped groove;

[0051] 30. Second housing; 301. Second overlapping part; 31. Column part; 310. Third threaded hole; 32. Positioning post;

[0052] 41. First connector; 42. Second connector; 43. Third connector. Detailed Implementation

[0053] First, those skilled in the art should understand that these embodiments are merely for explaining the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0054] Secondly, it should be noted that, in the description of the embodiments of this application, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0055] As described in the background section, the two-wheeled electric bicycles and electric motorcycles in the related technologies suffer from problems such as low assembly efficiency and poor connection stability. The inventors have found that the reasons for this problem are as follows: In the related technologies, the fixing of the U-shaped bracket decorative parts mainly relies on a combination of screws and clips. However, the clip structure is difficult to align precisely in narrow spaces, resulting in low installation efficiency; the elastic fixing method of the clips is prone to loosening due to vibration or external force during long-term use, and cannot meet the requirements of high-strength pull-out force; the combined installation of screws and clips requires multiple steps, which increases production costs and assembly time.

[0056] To address the aforementioned technical problems, this application provides a plastic part fixing structure and an electric vehicle. The plastic part fixing structure includes: a bracket, and a first housing and a second housing disposed along the extension direction of the bracket; on a cross section perpendicular to the extension direction of the bracket, the first housing and the second housing are disposed opposite to each other along the wall thickness direction of the bracket, and the first housing and the second housing together cover the bracket; either the first housing or the second housing is connected to the bracket to form an integral structure, and the second housing is fixedly connected to the first housing.

[0057] The plastic part fixing structure provided in this application allows the bracket to be assembled with either the first or second housing (taking the first housing as an example) during the manufacturing process, thereby firmly connecting them into a rigid sub-assembly. This avoids the possibility of relative displacement and collision between the bracket and the housing due to vibration, improving the connection stability. This operation can be completed very precisely and efficiently with the assistance of tooling fixtures. On the assembly line, this sub-assembly only needs to be aligned and fixed with the other housing (the second housing). This step-by-step assembly reduces the number of connection points that need to be aligned at once during assembly, reduces the difficulty and time of operation in confined spaces, improves assembly efficiency, and reduces production costs and assembly time.

[0058] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0059] Please refer to Figures 1-12 The first aspect of this application provides a plastic part fixing structure, including:

[0060] The bracket 10, and the first housing 20 and the second housing 30 disposed along the extending direction of the bracket 10;

[0061] On a cross section perpendicular to the extension direction of the support 10, the first housing 20 and the second housing 30 are arranged opposite each other along the wall thickness direction of the support 10, and the first housing 20 and the second housing 30 together cover the support 10.

[0062] Either the first housing 20 or the second housing 30 is connected to the bracket 10 to form an integral structure, and the second housing 30 is fixedly connected to the first housing 20.

[0063] It should be noted that, please refer to Figure 1 and Figure 4 As shown, the extending direction of the bracket 10 refers to the extending direction of the axis of the bracket 10. Please refer to [link / reference]. Figure 4 As shown, this application embodiment provides an exemplary U-shaped support 10, wherein the wall thickness of the support 10 is less than or equal to the wall width of the support 10, and the wall thickness direction of the support 10 is perpendicular to the wall width direction of the support 10 in a cross section perpendicular to the extension direction of the support 10.

[0064] In this embodiment of the application, please refer to Figure 1 As shown, the bracket 10 is the skeleton of the plastic part fixing structure. The bracket 10 bears the main mechanical load and is used to fix and support the vehicle frame structure. The first shell 20 and the second shell 30 together cover the bracket 10, thereby achieving the requirements of appearance integrity and aesthetics.

[0065] The plastic part fixing structure provided in this application allows the bracket 10 to be assembled with either the first housing 20 or the second housing 30 (taking the first housing 20 as an example) during the manufacturing process, thereby firmly connecting them into a rigid sub-assembly. This avoids the possibility of relative displacement and collision between the bracket 10 and the housing due to vibration, improving the connection stability. This operation can be completed very precisely and efficiently with the assistance of tooling fixtures. On the assembly line, this sub-assembly only needs to be aligned and fixed with the other housing (the second housing 30). This step-by-step assembly reduces the number of connection points that need to be aligned at once during assembly, reduces the difficulty and time of operation in confined spaces, improves assembly efficiency, and reduces production costs and assembly time.

[0066] In one possible implementation, please see Figure 1 As shown, the first housing 20 is disposed on the inner side of the bracket 10, and the first housing 20 is connected to the bracket 10 to form an integral structure; the second housing 30 is disposed on the outer side of the bracket 10, and the second housing 30 is fused together with the first housing 20 by energy welding.

[0067] In this embodiment, the first housing 20 and the bracket 10 are pre-assembled to form an integral structure, namely the bracket inner housing assembly. Then, the second housing 30 and the bracket inner housing assembly are placed in a welding mold for welding. This allows the second housing 30 and the first housing 20 to be fused together via energy welding, eliminating the need for screws, clips, or other fasteners. This achieves a high-strength connection between the first housing 20 and the second housing 30 even in space-constrained environments, while also ensuring aesthetic compatibility. Furthermore, the energy welding fusion of the second housing 30 and the first housing 20 ensures aesthetic compatibility while also improving overall structural strength and tensile strength, enhancing both aesthetics and safety.

[0068] Furthermore, the bracket 10 can be made of magnesium-aluminum alloy, which can significantly reduce the overall structural weight and provide excellent strength and rigidity while being extremely lightweight. It also has excellent shock absorption performance. In addition, it is easy to die-cast complex structures, which facilitates mass production.

[0069] Furthermore, the second housing 30 can adopt a plastic flame-retardant PC+ABS structure. The PC component can ensure sufficient mechanical strength and rigidity to prevent the second housing 30 from breaking under vibration and impact. The ABS component improves the material's processing performance, making it easier to manufacture U-shaped bracket shells with complex structures and smooth and beautiful surfaces through injection molding. At the same time, by using flame-retardant materials, the risk of fire can be effectively reduced and safety can be improved.

[0070] In one possible implementation, please see Figure 3 As shown, the periphery of the first housing 20 is provided with a first overlapping portion 201, and the periphery of the second housing 30 is provided with a second overlapping portion 301. The first overlapping portion 201 and the second overlapping portion 301 are both provided along the extending direction of the bracket 10, and the first overlapping portion 201 overlaps with the second overlapping portion 301.

[0071] The second housing 30 and the first housing 20 are fused together by energy welding to form a joint surface, which is set along the extension direction of the first overlapping portion 201 and the second overlapping portion 301.

[0072] In this embodiment, the first housing 20 and the bracket 10 are pre-assembled to form a bracket inner housing assembly. Then, the second housing 30 and the bracket inner housing assembly are placed in a welding mold for welding. Before this, the second housing 30 and the bracket inner housing assembly need to be pre-positioned by overlapping the first overlapping portion 201 and the second overlapping portion 301. This guides and pre-positions the first housing 20 and the second housing 30, preventing movement or misalignment of parts during welding, thus ensuring consistent welding quality and improving yield. Furthermore, the overlapping of the first overlapping portion 201 and the second overlapping portion 301 creates a physical barrier between the first housing 20 and the second housing 30. After energy welding, the molten plastic completely seals the gaps in this barrier, forming a continuous and complete sealing band. This improves sealing performance and dust and water resistance, preventing corrosion and contamination of the bracket 10 by external foreign objects, and enhancing the weather resistance and service life of the plastic fixing structure.

[0073] In one possible implementation, energy welding includes ultrasonic welding or laser welding.

[0074] In this embodiment, the second housing 30 and the first housing 20 can be welded by ultrasonic welding or by laser welding, so that the periphery of the second housing 30 and the first housing 20 are fused together to form a joint surface. There is no need to use screws, clips or other structures for fixation, thereby achieving a high-strength connection between the first housing 20 and the second housing 30 in space-constrained scenarios, while also taking into account the appearance matching.

[0075] In one possible implementation, please see Figure 1 , Figure 4 and Figure 5 As shown, the bracket 10 includes a first connecting section 11 and a second connecting section 12 connected to both ends of the first connecting section 11. The two second connecting sections 12 are set at an angle, and the first connecting section 11 and the second connecting section 12 are integrally formed structures.

[0076] The plastic part fixing structure also includes a first connector 41 and a second connector 42;

[0077] The first housing 20 includes a first housing segment 21 and a second housing segment 22 connected to both ends of the first housing segment 21. The first housing segment 21 is connected to the first connecting segment 11 by a first connector 41, and the second housing segment 22 is connected to the second connecting segment 12 by a second connector 42.

[0078] In this embodiment, the first housing 20 is divided into an independent first housing segment 21 and two second housing segments 22. The first housing segment 21 and the two second housing segments 22 are injection molded separately. On the one hand, this makes the shape of each housing segment simpler and more regular, and makes it easier to ensure the dimensional stability and accuracy of each housing segment. On the other hand, during assembly, even if a housing segment has a slight dimensional deviation, it can be finely adjusted independently without affecting the connection quality of other parts, avoiding the accumulation and amplification of tolerances of individual housing segments in the overall structure, which could lead to assembly failure. Furthermore, by adopting segmented connection, if a collision occurs and one housing segment is damaged, only the damaged housing segment can be replaced, without replacing the entire first housing 20 or even the entire bracket assembly, thereby improving the maintainability of the plastic part fixing structure and helping to reduce later maintenance costs.

[0079] In one possible implementation, please see Figure 4 As shown, a first through hole 110 is provided on the first connecting section 11; a second through hole 120 is provided on the second connecting section 12;

[0080] Please see Figure 5 As shown, a first boss 211 is provided on the first shell section 21, and a first threaded hole 2110 is provided on the first boss 211, which is opposite to the first through hole 110; a second boss 221 is provided on the second shell section 22, and a second threaded hole 2210 is provided on the second boss 221, which is opposite to the second through hole 120.

[0081] The first connector 41 passes through the first through hole 110 and is threaded into the first threaded hole 2110; the second connector 42 passes through the second through hole 120 and is threaded into the second threaded hole 2210.

[0082] In this embodiment, by providing a first boss 211 on the first shell segment 21, the local wall thickness of the first shell segment 21 is increased. A first threaded hole 2110 is opened on the first boss 211, ensuring a sufficiently deep thread depth and a greater number of engagement turns to prevent the first connector 41 from loosening from the first threaded hole 2110. Similarly, by providing a second boss 221 on the second shell segment 22, the local wall thickness of the second shell segment 22 is increased. A second threaded hole 2210 is opened on the second boss 221, ensuring a sufficiently deep thread depth and a greater number of engagement turns to prevent the second connector 42 from loosening from the second threaded hole 2210. The first shell segment 21 is connected to the first connecting segment 11 via the first connector 41, and the second shell segment 22 is connected to the second connecting segment 12 via the second connector 42. This secures the first shell 20 and the bracket 10 together through the fastening force of the connectors, eliminating loosening and abnormal noise. Moreover, if a part of the first housing 20 or the bracket 10 is damaged by an accidental impact, maintenance personnel can simply unscrew the connector, remove the damaged module, and replace it with a new module, which greatly facilitates subsequent maintenance and replacement.

[0083] In one possible implementation, please see Figure 6 , Figure 7 and Figure 8 As shown, the first shell section 21 is provided with first latches 212 at both ends; the second shell section 22 is provided with a second latch 222 at one end near the first shell section 21; the first latches 212 and the second latches 222 are locked together.

[0084] In this embodiment, during the assembly of the first housing 20 and the bracket 10, before fixing the first housing 20 and the bracket 10, the independently set first housing segment 21 and second housing segment 22 can be pre-assembled to form the first housing 20. By locking the first latch 212 and the second latch 222, not only can the first housing segment 21 and the second housing segment 22 be quickly aligned and fixed, improving production efficiency, but also the overall structure of the first housing 20 can be formed, allowing the first housing 20 to bear the force as a whole, thereby improving the overall structural stability of the plastic part fixing structure. When maintenance is required, simply remove the connector and then lock the first latch 212 and the second latch 222 to release the latch, achieving non-destructive disassembly, thus facilitating maintenance and disassembly.

[0085] Furthermore, the first shell segment 21 and the first latch 212 are integrally formed; the second shell segment 22 and the second latch 222 are integrally formed.

[0086] In one possible implementation, please see Figure 6 , Figure 7 and Figure 8As shown, the first latch 212 is provided with a first slot 2121 and a second slot 2122; the second latch 222 includes a first latching part 2221 and a second latching part 2222, the first latching part 2221 can be inserted into the first slot 2121, and the second latching part 2222 can be inserted into the second slot 2122.

[0087] The first latch 212 is also provided with a locking platform 2123, which is located at the opening of the first locking groove 2121; one end of the first locking part 2221 is provided with a locking tongue 2223, which can engage with the locking platform 2123 after the first locking part 2221 passes through the first locking groove 2121.

[0088] In this embodiment, the first snap-fit ​​part 2221 is inserted into the first slot 2121, and the second snap-fit ​​part 2222 is inserted into the second slot 2122, thereby constraining the movement of the second shell segment 22 and the first shell segment 21 in the extension direction and the wall width direction of the bracket 10. After the first snap-fit ​​part 2221 passes through the first slot 2121, it engages with the slot platform 2123 through the snap tongue 2223, thereby constraining the movement of the second shell segment 22 and the first shell segment 21 in the wall thickness direction of the bracket 10, thereby achieving the locking and fixing of the second shell segment 22 and the first shell segment 21. The mounting plate 2123 is positioned at the opening of the first slot 2121, and a latch 2223 is provided at one end of the first engaging part 2221. During the process of the first engaging part 2221 passing through the first slot 2121, the first engaging part 2221 can drive the latch 2223 to pass through the first slot 2121 together, thereby guiding and correcting the engagement of the latch 2223 with the mounting plate 2123, which is beneficial to improving assembly speed and production yield.

[0089] Further, please see Figure 7 As shown, there are two second slots 2122, arranged symmetrically on both sides of the first slot 2121 along the wall width direction of the bracket 10. Please refer to [link to relevant documentation]. Figure 8 As shown, there are two second snap-fit ​​parts 2222. Along the wall width direction of the bracket 10, the two second snap-fit ​​parts 2222 are symmetrically arranged on both sides of the first snap-fit ​​part 2221, thereby enhancing the connection strength between the first shell section 21 and the second shell section 22 and improving the overall structural stability of the first shell 20.

[0090] In one possible implementation, please see Figure 7 and Figure 9As shown, the first boss 211 includes a first step portion 2111 and a second step portion 2112. The first step portion 2111 is connected to the first shell section 21. The second step portion 2112 protrudes from the first step portion 2111 in a direction away from the first shell section 21. The second step portion 2112 is coaxially arranged with the first through hole 110 and the first threaded hole 2110. The second step portion 2112 can be at least partially inserted into the first through hole 110.

[0091] In this embodiment of the application, during the assembly process of the first shell section 21 and the first connecting section 11, the second step portion 2112 is inserted into the first through hole 110, thereby realizing the positioning and guidance of the first through hole 110 and the first threaded hole 2110. The first shell section 21 and the first connecting section 11 can be automatically aligned and accurately positioned before the connector is tightened, which is beneficial to improving assembly efficiency and accuracy.

[0092] In one possible implementation, please see Figure 8 As shown, a third boss 223 is provided at the end of the second shell section 22 away from the first shell section 21, and a third through hole 2230 is provided on the third boss 223.

[0093] Please see Figure 11 As shown, the end of the second housing 30 is provided with a column part 31 opposite to the third boss 223, and the column part 31 is provided with a third threaded hole 310 coaxially arranged with the third through hole 2230.

[0094] Please see Figure 12 As shown, the plastic part fixing structure also includes a third connector 43, which passes through the third through hole 2230 and is threadedly engaged with the third threaded hole 310.

[0095] In this embodiment, after the second housing 30 and the inner housing assembly of the bracket are welded in the welding mold, the second housing 30 and the first housing 20 are further fixed by the third connector 43. By providing a third boss 223 on the second housing section 22 and opening a third through hole 2230 on the third boss 223, the local wall thickness of the second housing section 22 is increased, thereby ensuring the structural strength and load-bearing performance of the second housing section 22. By providing a column portion 31 at the end of the second housing 30 and opening a third threaded hole 310 on the column portion 31, the local wall thickness of the second housing 30 is increased, which can ensure a sufficiently deep thread depth and more engagement turns, preventing the third connector 43 from loosening from the third threaded hole 310. The second housing 30 is connected to the first housing 20 via the third connector 43. On the one hand, the fastening force of the third connector 43 can tightly press the second housing 30 and the first housing 20 together, eliminating looseness and abnormal noise. On the other hand, it can actively share the end stress, avoid excessive stress concentration at the end of the peripheral weld seam, and ensure the reliability of the connection between the second housing 30 and the first housing 20. Furthermore, it can provide a final adjustment and locking step for the assembly of the entire plastic part fixing structure, ensuring that all parts fit tightly.

[0096] Furthermore, the second shell section 22 and the third boss 223 are integrally formed structures; the second shell 30 and the column part 31 are integrally formed structures.

[0097] In this embodiment of the application, please refer to Figure 1 As shown, there are two first connectors 41 and two second connectors 42. Please refer to [link / reference]. Figure 12 As shown, there are four third connectors 43, and a total of eight connectors, all made of SWRCH22A material. The installation torque of the connectors is 0.6 N·m to 1.1 N·m.

[0098] In one possible implementation, please see Figure 7 As shown, a positioning hole 213 is provided on the first shell section 21; please refer to Figure 10 As shown, the second housing 30 is provided with a positioning post 32 that is opposite to the positioning hole 213, and the positioning post 32 is inserted into the positioning hole 213.

[0099] In this embodiment of the application, before welding the second housing 30 to the bracket inner housing assembly, the second housing 30 and the bracket inner housing assembly need to be pre-positioned. By inserting the positioning post 32 into the positioning hole 213, and by overlapping the first overlapping part 201 and the second overlapping part 301, the first housing 20 and the second housing 30 are guided and pre-positioned, which can prevent the parts from moving or misaligning during the welding process, thereby ensuring the consistency of welding quality and improving the yield.

[0100] Furthermore, the second housing 30 and the positioning post 32 are integrally formed.

[0101] In one possible implementation, please see Figure 8 and Figure 12 As shown, a stepped groove 2231 is also provided on the third boss 223. The stepped groove 2231 is coaxially arranged with the third through hole 2230 and the third threaded hole 310. The stepped groove 2231 is located at one end of the third boss 223 facing the column part 31. The column part 31 can be inserted into the stepped groove 2231 at least partially.

[0102] In this embodiment, before welding the second housing 30 to the bracket inner housing assembly, the second housing 30 and the bracket inner housing assembly need to be pre-positioned. This is achieved by inserting the positioning pin 32 into the positioning hole 213, inserting the pin body 31 into the stepped groove 2231, and overlapping the first overlapping part 201 with the second overlapping part 301. This guides and pre-positions the first housing 20 and the second housing 30, enabling precise alignment of the middle, end, and periphery of the first housing 20 and the second housing 30. This prevents the parts from moving or misaligning during the welding process, ensuring consistent welding quality and improving the yield rate.

[0103] A second aspect of this application also provides an electric vehicle, which can be a two-wheeled electric bicycle or an electric motorcycle, and the electric vehicle includes the plastic part fixing structure as described above.

[0104] Given that the electric vehicle in this embodiment includes the plastic part fixing structure described in any of the above embodiments, the structure and beneficial effects of the electric vehicle including the plastic part fixing structure will not be elaborated further in this embodiment.

[0105] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0106] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, 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.

[0107] 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 plastic part fixing structure, characterized in that, include: The bracket (10), and a first housing (20) and a second housing (30) disposed along the extending direction of the bracket (10); On a cross section perpendicular to the extension direction of the bracket (10), the first housing (20) and the second housing (30) are disposed opposite to each other along the wall thickness direction of the bracket (10), and the first housing (20) and the second housing (30) together cover the bracket (10). Either the first housing (20) or the second housing (30) is connected to the bracket (10) to form an integral structure, and the second housing (30) is fixedly connected to the first housing (20).

2. The plastic part fixing structure according to claim 1, characterized in that, The first housing (20) is disposed on the inner side of the bracket (10), and the first housing (20) is connected to the bracket (10) to form an integral structure; the second housing (30) is disposed on the outer side of the bracket (10), and the second housing (30) is fused together with the first housing (20) by energy welding.

3. The plastic part fixing structure according to claim 2, characterized in that, The first housing (20) has a first overlapping part (201) on its periphery, and the second housing (30) has a second overlapping part (301) on its periphery. The first overlapping part (201) and the second overlapping part (301) are both arranged along the extension direction of the bracket (10), and the first overlapping part (201) overlaps with the second overlapping part (301). The second housing (30) and the first housing (20) are fused together by energy welding to form a joint surface, which is provided along the extension direction of the first overlapping part (201) and the second overlapping part (301).

4. The plastic part fixing structure according to claim 2, characterized in that, The energy welding includes ultrasonic welding or laser welding.

5. The plastic part fixing structure according to claim 2, characterized in that, The bracket (10) includes a first connecting segment (11) and a second connecting segment (12) connected to both ends of the first connecting segment (11), the two second connecting segments (12) being arranged at an angle; The plastic part fixing structure also includes a first connector (41) and a second connector (42); The first housing (20) includes a first housing segment (21) and a second housing segment (22) connected to both ends of the first housing segment (21). The first housing segment (21) is connected to the first connecting segment (11) through the first connector (41), and the second housing segment (22) is connected to the second connecting segment (12) through the second connector (42).

6. The plastic part fixing structure according to claim 5, characterized in that, The first connecting segment (11) has a first through hole (110); the second connecting segment (12) has a second through hole (120). The first shell section (21) is provided with a first boss (211), and the first boss (211) is provided with a first threaded hole (2110) which is opposite to the first through hole (110); the second shell section (22) is provided with a second boss (221), and the second boss (221) is provided with a second threaded hole (2210) which is opposite to the second through hole (120). The first connector (41) passes through the first through hole (110) and is threaded into the first threaded hole (2110); the second connector (42) passes through the second through hole (120) and is threaded into the second threaded hole (2210).

7. The plastic part fixing structure according to claim 5, characterized in that, The first shell segment (21) is provided with a first latch (212) at both ends; the second shell segment (22) is provided with a second latch (222) at one end near the first shell segment (21); the first latch (212) and the second latch (222) are locked together.

8. The plastic part fixing structure according to claim 7, characterized in that, The first latch (212) is provided with a first slot (2121) and a second slot (2122); the second latch (222) includes a first latching part (2221) and a second latching part (2222), the first latching part (2221) can be inserted into the first slot (2121), and the second latching part (2222) can be inserted into the second slot (2122); The first latch (212) is also provided with a locking platform (2123), which is located at the opening of the first locking groove (2121); one end of the first locking part (2221) is provided with a locking tongue (2223), which can engage with the locking platform (2123) after the first locking part (2221) passes through the first locking groove (2121).

9. The plastic part fixing structure according to claim 6, characterized in that, The first boss (211) includes a first stepped portion (2111) and a second stepped portion (2112). The first stepped portion (2111) is connected to the first shell segment (21). The second stepped portion (2112) protrudes from the first stepped portion (2111) in a direction away from the first shell segment (21). The second stepped portion (2112) is coaxially arranged with the first through hole (110) and the first threaded hole (2110). The second stepped portion (2112) can be at least partially inserted into the first through hole (110).

10. The plastic part fixing structure according to any one of claims 5-9, characterized in that, The second shell section (22) is provided with a third boss (223) at one end away from the first shell section (21), and a third through hole (2230) is provided on the third boss (223). The end of the second housing (30) is provided with a column part (31) opposite to the third boss (223), and the column part (31) is provided with a third threaded hole (310) coaxially arranged with the third through hole (2230). The plastic part fixing structure also includes a third connector (43), which passes through the third through hole (2230) and is threadedly engaged with the third threaded hole (310).

11. The plastic part fixing structure according to claim 10, characterized in that, The first shell section (21) is provided with a positioning hole (213); the second shell section (30) is provided with a positioning post (32) that is opposite to the positioning hole (213), and the positioning post (32) is inserted into the positioning hole (213).

12. The plastic part fixing structure according to claim 11, characterized in that, The third boss (223) is also provided with a stepped groove (2231), which is coaxially arranged with the third through hole (2230) and the third threaded hole (310). The stepped groove (2231) is located at one end of the third boss (223) facing the column part (31). The column part (31) can be at least partially inserted into the stepped groove (2231).

13. An electric vehicle, characterized in that, Includes the plastic part fixing structure as described in any one of claims 1 to 12 above.

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