Automobile wire harness waterproof shaft sleeve structure

Abstract

The utility model provides a kind of waterproof axle sleeve structure of automobile wire harness, the axle sleeve structure includes lengthened pulling part and limiting part coaxially connected as a whole, wherein: the outer diameter of lengthened pulling part is less than the outer diameter of limiting part, and guiding slope face of smooth transition is set in the connecting place of both;Annular clamping groove for sealing connection with automobile mounting hole is opened in the position of outer circumferential body on the inner end of limiting part close to guiding slope face.The utility model is through the coaxial connection structure cooperation guiding slope face and annular clamping groove design of lengthened pulling part and limiting part, realize smooth guiding and reliable limiting when installing, simultaneously ensure the waterproof performance of automobile wire harness by multiple sealing protrusions in wire harness sealing hole, with the advantages of improving assembly convenience and sealing reliability.

Description

Technical Field

[0001] This utility model relates to the field of automotive wiring harness protection technology, and in particular to a waterproof bushing structure for automotive wiring harnesses. Background Technology

[0002] As a core component of the vehicle's electrical system, automotive wiring harnesses play a crucial role in power transmission and signal delivery. During vehicle operation, wiring harnesses need to pass through critical areas such as body panels and engine compartment partitions, which are often exposed to the risk of liquid intrusion from rainwater, car wash water, and road flooding. Traditional wiring harness waterproofing solutions primarily use rubber sleeves combined with sealant, which suffers from assembly difficulties and insufficient sealing reliability. Particularly at the mating area between the bushing and the mounting hole, the lack of effective guiding structures and limiting designs makes installation prone to problems such as bushing deformation and damage to the sealing surface.

[0003] In addition, the existing wiring harness sealing hole structure is simple, which is prone to poor sealing. When the vehicle is in a humid environment or driving through water, external moisture may seep into the vehicle through the gap between the wiring harness and the seal, leading to electrical system short circuits, corrosion and other malfunctions. Utility Model Content

[0004] This invention addresses the technical shortcomings of existing waterproof bushings for wiring harnesses, such as difficulty in installation and poor protection levels, by providing a waterproof bushing structure for automotive wiring harnesses that improves assembly convenience and sealing reliability.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution:

[0006] A waterproof bushing structure for automotive wiring harnesses includes an extended pulling part and a limiting part coaxially connected as one unit, wherein: the outer diameter of the extended pulling part is smaller than the outer diameter of the limiting part, and a guide slope with a smooth transition is provided at the connection between the two; an annular groove for sealing connection with an automotive mounting hole is provided on the outer periphery of the inner end of the limiting part near the guide slope.

[0007] Preferably, the inner cavity of the extended pulling part is configured as a wire harness through hole, and the inner cavity of the limiting part is configured as a wire harness sealing hole communicating with the wire harness through hole.

[0008] Preferably, the wiring harness sealing hole is coaxially arranged with the wiring harness through hole, and its diameter is smaller than the diameter of the wiring harness through hole, but slightly larger than the diameter of the automotive wiring harness.

[0009] Preferably, a first sealing protrusion is provided on the inner peripheral wall of the inner end of the wire harness sealing hole along its circumference, and a second sealing protrusion is provided on the inner peripheral wall of the outer end along its circumference.

[0010] More preferably, the cross-sections of the first sealing protrusion and the second sealing protrusion are isosceles triangular structures, and their diameters are slightly smaller than the diameter of the automotive wiring harness, so as to be sealed to the outer surface of the automotive wiring harness in an interference fit.

[0011] Preferably, an integrally formed sealing reinforcement is provided in the middle of the outer side wall of the limiting part. The sealing reinforcement is a hollow annular structure, and its inner hole constitutes part of the wire harness sealing hole.

[0012] More preferably, the connection between the outer periphery of the sealing reinforcement and the limiting part is provided with an integrally formed reinforcing rib, forming an annular stepped structure with gradually increasing outer diameter.

[0013] Preferably, the top of the guide slope near the annular groove has a rounded corner structure, and there is a smooth transition between the two.

[0014] Preferably, the outer diameter corresponding to the top of the guide slope is smaller than the outer diameter of the limiting part, and both are larger than the inner diameter of the car mounting hole;

[0015] The inner diameter of the car mounting hole is larger than the outer diameter corresponding to the bottom of the annular groove, so that the car mounting hole is pressed through the guide slope and then limited and embedded in the annular groove.

[0016] Preferably, the bushing structure is integrally injection molded from nitrile rubber, fluororubber, EPDM rubber or silicone rubber.

[0017] The present invention adopts the above technical solution and has the following technical effects compared with the prior art:

[0018] The waterproof bushing structure for automotive wiring harnesses provided by this utility model achieves smooth guidance and reliable positioning during installation through a coaxial connection structure between the extended pull section and the limiting section, combined with a guide slope and annular groove design. Simultaneously, multiple sealing protrusions within the wiring harness sealing hole ensure the waterproof performance of the automotive wiring harness, offering advantages such as improved assembly convenience and sealing reliability. The extended pull section at one end ensures convenient installation on automotive mounting holes, saving labor time costs. Furthermore, the sealing structure on the inner and outer diameters prevents leakage, ensuring product reliability and stability. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of a waterproof bushing structure for automotive wiring harnesses according to this utility model. Figure 1 ;

[0020] Figure 2 This is a three-dimensional structural diagram of a waterproof bushing structure for automotive wiring harnesses according to this utility model. Figure 2 ;

[0021] Figure 3 This is a cross-sectional view of a waterproof bushing structure for automotive wiring harnesses according to this utility model.

[0022] Figure 4 This is a schematic diagram of a waterproof bushing structure for automotive wiring harnesses and an assembly structure for automotive wiring harnesses according to the present invention.

[0023] The accompanying figures are labeled as follows:

[0024] 100-Sleeve structure, 101-Extended pulling part, 102-Limiting part, 103-Guide slope, 104-Annular groove, 105-Sealing reinforcement part, 106-Wire harness through hole, 107-Wire harness sealing hole, 108-First sealing protrusion, 109-Second sealing protrusion, 110-Reinforcing rib; 200-Automotive wire harness. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] In existing technologies, automotive wiring harnesses typically require waterproof bushings for sealing protection when passing through body components. Traditional bushing structures present installation difficulties, requiring operators to spend considerable time adjusting the bushing position, and uneven stress during installation can easily damage the sealing structure. Furthermore, the seal between existing bushings and mounting holes relies primarily on interference fits, lacking effective limiting structures. Over time, this can lead to loosening and seal failure, allowing moisture to easily seep into the vehicle's electrical system through the gaps.

[0028] To address the aforementioned issues, considering the difficulties in installation due to the lack of a guiding structure and the susceptibility to failure of the single sealing structure in existing bushing installations, a bushing structure that is easy to install and provides multiple seals needs to be designed. Analysis revealed that adding an elongated pull section to the bushing can reduce installation resistance; the dimensional difference between the limiting section and the pull section can create a physical limit, preventing over-insertion of the bushing. Furthermore, an annular groove in the limiting section allows for a double seal after the mounting hole is inserted.

[0029] In some embodiments, based on the above design concept, such as Figure 1 , Figure 2 and Figure 3As shown, this application proposes a waterproof bushing structure for automotive wiring harnesses. The bushing structure 100 includes an extended pulling part 101 and a limiting part 102 coaxially connected as one unit. The outer diameter of the extended pulling part 101 is smaller than the outer diameter of the limiting part 102, and a guide slope 103 with a smooth transition is provided at the connection between the two. An annular groove 104 for sealing connection with the automotive mounting hole is provided on the outer periphery of the inner end of the limiting part 102 near the guide slope 103.

[0030] The extended pulling part 101 refers to the slender section at the front end of the bushing structure that bears tensile force. Its outer diameter is designed to be smaller than the inner diameter of the mounting hole to reduce resistance through tensile deformation during installation. The limiting part 102 refers to the annular section at the rear end of the bushing that is used to fix the position. Its outer diameter is larger than the inner diameter of the mounting hole, and the difference in size forms a physical limit after installation. The guide slope 103 refers to the inclined transition area connecting the extended pulling part 101 and the limiting part 102. It can be implemented using an arc-shaped curved surface or a conical slope, and is used to guide the mounting hole to slide into the annular groove 104 along the slope. The annular groove 104 refers to the groove structure opened on the outer periphery of the limiting part 102. It can be U-shaped or V-shaped, and forms a compression seal with the edge of the mounting hole through an interference fit.

[0031] Specifically, when the bushing structure 100 is installed on the automotive mounting hole, the extended pulling part 101 is subjected to axial tension, causing radial contraction and further reducing its outer diameter, thus allowing it to pass smoothly through the mounting hole. After the extended pulling part 101 has completely passed through, because the outer diameter of the limiting part 102 is larger than the inner diameter of the mounting hole, the edge of the mounting hole is forced to slide into the annular groove 104 along the guide slope 103. The smooth transition of the guide slope 103 reduces frictional resistance during installation and avoids damage to the sealing structure. After the mounting hole is embedded in the annular groove 104, its edge forms an interference fit with the groove wall, and at the same time, a radial clamping force is generated under the action of the elastic restoring force of the bushing material, achieving a double sealing effect.

[0032] Compared with existing technologies, traditional bushings rely on a single interference fit seal, lack a guiding structure which makes installation difficult, and are prone to loosening due to material aging after long-term use. This solution, through the design of the dimensional difference between the extended pulling part 101 and the limiting part 102, combined with the guide slope 103 and the annular groove 104, not only simplifies the installation process, but also forms a stable multi-seal structure through the synergistic effect of the annular groove 104 and the guide slope 104, effectively preventing moisture infiltration.

[0033] Through the above technical solution, this application simplifies the bushing installation process, allowing operators to complete the assembly simply by pulling, without the need for complex tools or repeated position adjustments. Simultaneously, the fit between the annular groove 104 and the guide slope 104 significantly improves sealing reliability, preventing seal failure due to vibration or material deformation and extending the service life of the bushing.

[0034] In some of these embodiments, such as Figure 1 and Figure 3 As shown, this application further proposes that the inner cavity of the extended pulling part 101 is configured as a wire harness through hole 106, and the inner cavity of the limiting part 102 is configured as a wire harness sealing hole 107 communicating with the wire harness through hole 106.

[0035] The wire harness through-hole 106 refers to a through-channel formed inside the extended pulling section. Its inner diameter can be set to be larger than the diameter of the automotive wire harness. This structure reduces the contact area between the wire harness and the hole wall by increasing the wire-passing space, thereby reducing wire-passing resistance. The wire harness sealing hole 107 refers to a sealing channel formed inside the limiting section 102. Its inner diameter can be set to be slightly smaller than the diameter of the wire harness through-hole. This structure forms radial constraint on the wire harness by reducing the hole diameter, providing an installation base for the subsequent sealing structure.

[0036] Specifically, the wire harness through-hole 106 and the wire harness sealing hole 107 are coaxially connected to form a continuous wire threading path. When the wire harness is inserted into the extended pulling part 106, the larger inner diameter of the wire harness through-hole 106 allows the wire harness to move freely, avoiding damage to the outer sheath due to friction. When the wire harness enters the limiting part 102, the smaller inner diameter of the wire harness sealing hole 107 forms a sealing fit with the outer surface of the wire harness.

[0037] In one specific embodiment, such as Figure 3 As shown, this application further proposes that the wiring harness sealing hole 107 and the wiring harness through hole 106 are arranged coaxially, with the sealing hole 107 having a diameter smaller than the diameter of the through hole 106 and slightly larger than the diameter of the automotive wiring harness. Coaxial arrangement means that the central axis of the sealing hole 107 coincides with the central axis of the through hole 106. A diameter slightly larger than the diameter of the automotive wiring harness means that the difference between the inner diameter of the sealing hole 107 and the outer diameter of the wiring harness is controlled within the range of 0.1-0.5 mm. This can be achieved by utilizing the deformation compensation capability of elastic rubber material, ensuring smooth assembly while forming an effective sealing contact.

[0038] Specifically, the coaxial arrangement of the wire harness sealing hole 107 and the wire harness through hole 106 allows the wire harness to move along a single axis during insertion, avoiding asymmetrical friction between the wire harness and the hole wall due to eccentricity of the hole. The setting that the diameter of the wire harness sealing hole 107 is slightly larger than the diameter of the wire harness allows the elastic sealing protrusions on the inner wall of the sealing hole to uniformly wrap around the surface of the wire harness when deformed under pressure. Even if there are diameter tolerances or ellipticity deviations in the wire harness, local gaps can still be eliminated through the adaptive deformation of the elastic material.

[0039] In one specific embodiment, such as Figure 3As shown, this application further proposes to provide a first sealing protrusion 108 along its circumferential direction on the inner peripheral wall of the inner end of the wire harness sealing hole 107, and a second sealing protrusion 109 along its circumferential direction on the inner peripheral wall of the outer end. The first sealing protrusion 108 refers to an annular protrusion structure located at one end of the wire harness sealing hole 107, which can be implemented using an elastic material integrally formed with the sealing hole, used to prevent liquid from seeping along the wire harness surface to the other side. The second sealing protrusion 109 refers to an annular protrusion structure located at the other end of the wire harness sealing hole 107, which can be implemented using a continuous flange arranged coaxially with the sealing hole, used to prevent liquid from seeping in from the outer gap.

[0040] Specifically, when the wire harness passes through the wire harness sealing hole 107, the first sealing protrusion 108 and the second sealing protrusion 109 respectively form an interference contact with the outer surface of the wire harness. The second sealing protrusion 109 forms a first sealing barrier at one end of the wire harness, which can trap liquid that enters from the external environment along with the surface of the wire harness; the first sealing protrusion 108 forms a second sealing barrier at the other end of the wire harness, which can intercept residual liquid caused by assembly errors or vibration. The two protrusions are arranged axially at intervals to form a redundant sealing structure, so that even if a local gap occurs on one side of the seal due to wire harness deformation, the other side can still maintain an effective seal.

[0041] Compared to existing technologies, traditional solutions typically only install a single-point sealing structure at the end of the wire harness channel, which is prone to seal failure due to wire harness swaying under dynamic operating conditions. This solution, through an axial double-seal structure design, achieves dual protection within the same installation space, significantly reducing the risk of overall seal performance degradation due to the failure of a single sealing point.

[0042] Through the above technical solution, this application can effectively block the bidirectional penetration path of liquid along the axial direction of the wire harness, and improve the adaptability of the sealing structure to the irregular shape of the wire harness surface while ensuring the assembly process tolerance, thus preventing sealing failure caused by slight deformation or vibration displacement of the wire harness.

[0043] As one specific implementation method, such as Figure 3 and Figure 4 As shown, this application further proposes that the cross-sections of the first sealing protrusion 108 and the second sealing protrusion 109 are isosceles triangular structures, and their diameters are slightly smaller than the diameter of the automotive wiring harness, forming an interference fit with the outer surface of the automotive wiring harness. The isosceles triangular structure refers to the cross-section of the sealing protrusion having two symmetrical hypotenuses. This geometry can produce symmetrical elastic deformation under pressure, forming a uniform contact pressure distribution. The diameter being slightly smaller than the diameter of the automotive wiring harness refers to the inner diameter of the sealing protrusion in its natural state, achieving the interference fit through the elastic deformation of the rubber material.

[0044] Specifically, when the automotive wiring harness passes through the wiring harness sealing hole 107, the apex of the isosceles triangular structure first contacts the wiring harness surface. During axial advancement, the symmetrical beveled structure guides the wiring harness to gradually open the sealing protrusion. Due to the radial pressure generated by the interference fit, the two beveled surfaces of the sealing protrusion simultaneously undergo uniform deformation, forming a continuous sealing band around the wiring harness. This symmetrical deformation mode can compensate for local ellipticity deviations or minor depressions on the wiring harness surface, ensuring that the sealing protrusion always maintains surface contact with the wiring harness. At the same time, the isosceles triangular structure avoids unilateral stress concentration, preventing permanent damage to the rubber material during repeated deformation.

[0045] Through the above technical solution, this application effectively solves the problem of uneven sealing interface caused by insufficient roundness of the wiring harness. The isosceles triangular sealing protrusion adapts to the irregular contour of the wiring harness surface through symmetrical deformation, and the continuous radial pressure generated by the interference fit ensures a tight seal at the sealing interface. This structure maintains smooth assembly while forming a double dynamic sealing barrier to prevent moisture from penetrating into the vehicle interior along the surface of the automotive wiring harness.

[0046] In some of these embodiments, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this application further proposes that an integrally formed sealing reinforcement part 105 is provided in the middle of the outer side wall of the limiting part 102. The sealing reinforcement part 105 is a hollow annular structure, and its inner hole constitutes part of the wire harness sealing hole 107.

[0047] The sealing reinforcement 105 refers to an annular protrusion structure formed by continuous material molding with the outer wall of the limiting part 102. Specifically, it can be achieved by simultaneous molding using injection molding. This structure forms a locally reinforced area by increasing the radial thickness of the outer wall of the limiting part 102. The hollow annular structure refers to an annular structure that is evenly distributed circumferentially and forms a cavity inside, so as to form continuous circumferential support while maintaining the lightweight of the material.

[0048] Specifically, the integral molding of the sealing reinforcement 105 and the outer wall of the limiting part 102 eliminates the gaps generated during the assembly of the split seal. Its annular cavity structure absorbs stress through cavity deformation when subjected to external pressure, while the radial pressure is evenly distributed through the annular wall surface. The inner hole of the sealing reinforcement 105 is coaxially connected with the wire harness sealing hole 107, so that the wire harness channel maintains a continuous through state in the reinforced area.

[0049] In addition, such as Figure 2 and Figure 3As shown, this application further proposes to provide an integrally formed reinforcing rib 110 at the connection between the outer periphery of the sealing reinforcement 105 and the limiting part 102, forming an annular stepped structure with progressively increasing outer diameters. The reinforcing rib 110 refers to a strip-shaped protrusion extending circumferentially along the connection, which can be implemented using injection molding and simultaneously molded with the main structure to increase the bending resistance of the connection area. The annular stepped structure refers to a transitional form composed of multiple concentric rings with increasing diameters, which can be implemented by forming a stepped contour using layered injection molding to achieve stress gradient distribution.

[0050] Specifically, when the sealing reinforcement 105 is subjected to assembly pressure, the reinforcing rib 110 suppresses deformation by increasing the moment of inertia of the connecting section. The annular stepped structure, through its progressively expanding diameter geometry, ensures that external loads are uniformly transferred to the main body of the limiting part 102 along the stepped plane, preventing local stress from exceeding the material's yield limit. Under dynamic conditions, the multi-level support surface formed by the stepped structure can disperse vibration energy and prevent microcracks from forming at the sealing interface.

[0051] In some of these embodiments, such as Figure 1 and Figure 3 As shown, this application further proposes that the top of the guide slope 103 near the annular groove 104 has a rounded corner structure, with a smooth transition between the two. The rounded corner structure refers to the arc-shaped surface formed at the connection between the top of the guide slope 103 and the annular groove 104, which can be achieved using a circular arc transition with a radius ranging from 0.5 mm to 2 mm. This structure can eliminate stress concentration caused by sharp edges.

[0052] Specifically, when the bushing is inserted into the mounting hole of the vehicle, the rounded corner structure at the top of the guide slope 103 first contacts the inner wall of the mounting hole. The arc-shaped curved surface disperses the contact stress, reducing the risk of scratching the inner wall of the mounting hole. As the bushing continues to advance, the smooth transition area between the guide slope 103 and the annular groove 104 gradually deforms under the pressure of the inner wall of the mounting hole, and the overall diameter tends to decrease during the compression process. This allows the guide slope 103 to pass through the mounting hole with interference compression, and then enter the position of the annular groove 104. After leaving the mounting hole, the rounded corner at the bottom of the guide slope 103 returns to its original shape under its own elasticity, and is clamped with the outer limiting part 102 on both sides of the mounting hole to achieve the purpose of sealing and limiting.

[0053] In some embodiments, as shown in the figure, this application further proposes that the outer diameter corresponding to the top of the guide slope 103 is smaller than the outer diameter of the limiting part 102, and the outer diameters of both the guide slope 103 and the limiting part 102 are larger than the inner diameter of the car mounting hole. The inner diameter of the car mounting hole is slightly larger than the outer diameter corresponding to the bottom of the annular groove 104, so that the car mounting hole is pressed through the guide slope 103 and then limited and embedded in the annular groove 104.

[0054] The outer diameter corresponding to the top of the guide slope 103 is the largest outer diameter at the outermost end. Its function is to allow the guide slope 103 to deform under external force and pass through the car mounting hole, and then return to its original shape under its own elasticity. The outermost end of the guide slope 103, after returning to its original shape, can limit and block the periphery of the car mounting hole in the annular groove 104, preventing it from slipping off the guide slope 103. The outer diameter of the limiting part 102 is the largest outer diameter of its main body, which can be implemented using a cylindrical structure larger than the inner diameter of the mounting hole. Its function is to provide a final fitting position for the edge of the mounting hole. The outer diameter corresponding to the bottom of the annular groove 104 refers to the outer surface diameter of the deepest part of the groove. It can be implemented using an annular recess structure slightly smaller than the inner diameter of the mounting hole. Its function is to force the edge of the mounting hole to elastically engage and form a seal through interference fit.

[0055] Specifically, during the assembly process, the extended pulling part 101 is manually pulled. The design of the outer diameter of the top of the guide slope 103 being larger than the inner diameter of the mounting hole causes slight compression when the bushing is initially inserted. This guides the guide slope 103 to be compressed along the edge of the mounting hole and undergo elastic deformation. Under the action of external pulling force, when the bushing continues to be pushed to the limiting part, the annular groove 104 enters the mounting hole position, and the two sides of the mounting hole are sealed by the groove sidewall formed by the side end face of the limiting part 102 and the side end face of the guide slope 103.

[0056] The process involves manually pulling and lengthening the traction section 101 to achieve elastic deformation of each component on the bushing in the axial and radial directions, which reduces the initial assembly resistance and utilizes the elastic recovery characteristics of the material to achieve a double seal: for example, the V-shaped cross-section limiting groove 104 and the radial interference with the edge of the mounting hole form the first seal, and the axial limiting of the two side walls of the groove against the edge of the mounting hole forms the second seal.

[0057] In some embodiments, this application further proposes that the bushing structure 100 is integrally injection molded from conventionally known materials such as nitrile rubber, fluororubber, EPDM rubber, or silicone rubber. Integral injection molding refers to a process method that uses a mold to process molten rubber material into a complete part in one step. Specifically, this can be achieved using a screw-type injection molding machine in conjunction with a closed mold structure, eliminating the seam defects of traditional split structures.

[0058] Through the above technical solution, this application achieves an interference seal between the bushing structure 100 and the mounting hole, and the elastic deformation of the guide slope 103 allows the assembly process to be completed without auxiliary tools. Nitrile rubber, fluororubber, EPDM rubber, or silicone rubber can be selected according to actual needs, and the availability of different materials allows the same structural design to adapt to the multi-scenario application needs of passenger cars, commercial vehicles, and special vehicles.

[0059] In summary, such as Figures 1 to 4 As shown, the waterproof bushing structure for automotive wiring harnesses provided by this utility model includes a stretchable extended pulling part 101, a guide slope 103 for assembly into an automotive mounting hole, a limiting groove 104 for assembly into the automotive mounting hole and having a sealing function, a wiring harness sealing hole 107 for assembling the wiring harness and maintaining a high seal, and a sealing protrusion.

[0060] In use, when the bushing structure 100 is installed into the automotive mounting hole, the extended pull part 101 can be manually pulled and installed into the hole along the guide slope 103, ensuring convenient installation and saving labor time. The wiring harness sealing hole 107 and the front and rear sealing protrusions ensure a high level of sealing even when the outer diameter roundness of the wiring harness is insufficient, preventing water from entering the vehicle interior along the wiring harness and effectively preventing product leakage, thus ensuring product reliability and stability.

[0061] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0062] Secondly, the accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0063] Finally, the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A waterproof bushing structure for automotive wiring harnesses, characterized in that, The bushing structure (100) includes an extended pulling part (101) and a limiting part (102) coaxially connected as one unit, wherein: the outer diameter of the extended pulling part (101) is smaller than the outer diameter of the limiting part (102), and a guide slope (103) with a smooth transition is provided at the connection between the two; an annular groove (104) for sealing connection with the automobile mounting hole is provided on the outer periphery of the inner end of the limiting part (102) near the guide slope (103).

2. The waterproof bushing structure for automotive wiring harnesses according to claim 1, characterized in that, The inner cavity of the extended pulling part (101) is configured as a wire harness through hole (106), and the inner cavity of the limiting part (102) is configured as a wire harness sealing hole (107) communicating with the wire harness through hole (106).

3. The automotive wiring harness waterproof bushing structure according to claim 2, characterized in that, The wiring harness sealing hole (107) is coaxially arranged with the wiring harness through hole (106), and its diameter is smaller than the diameter of the wiring harness through hole (106) and slightly larger than the diameter of the automotive wiring harness (200).

4. The automotive wiring harness waterproof bushing structure according to claim 2, characterized in that, A first sealing protrusion (108) is provided on the inner peripheral wall of the inner end of the wire harness sealing hole (107) along its circumference, and a second sealing protrusion (109) is provided on the inner peripheral wall of the outer end along its circumference.

5. The automotive wiring harness waterproof bushing structure according to claim 4, characterized in that, The first sealing protrusion (108) and the second sealing protrusion (109) have an isosceles triangular cross-section and their diameters are slightly smaller than the diameter of the vehicle wiring harness (200), and are sealed to the outer surface of the vehicle wiring harness (200) in an interference fit.

6. The waterproof bushing structure for automotive wiring harnesses according to claim 2, characterized in that, An integrally formed sealing reinforcement part (105) is provided in the middle of the outer wall of the limiting part (102). The sealing reinforcement part (105) is a hollow annular structure, and its inner hole constitutes part of the wire harness sealing hole (107).

7. The automotive wiring harness waterproof bushing structure according to claim 6, characterized in that, The outer periphery of the sealing reinforcement part (105) is provided with an integrally formed reinforcing rib (110) at the connection between the outer periphery of the sealing reinforcement part (105) and the limiting part (102), forming an annular stepped structure with gradually increasing outer diameter.

8. The waterproof bushing structure for automotive wiring harnesses according to claim 1, characterized in that, The top of the guide slope (103) near the annular groove (104) has a rounded corner structure, and there is a smooth transition between the two.

9. The waterproof bushing structure for automotive wiring harnesses according to claim 1, characterized in that, The outer diameter corresponding to the top of the guide slope (103) is smaller than the outer diameter of the limiting part (102), and both are larger than the inner diameter of the car mounting hole; The inner diameter of the car mounting hole is larger than the outer diameter corresponding to the bottom of the annular groove (104), so that the car mounting hole is pressed through the guide slope (103) and then limited and embedded in the annular groove (104).

10. The waterproof bushing structure for automotive wiring harnesses according to claim 1, characterized in that, The bushing structure (100) is integrally injection molded from nitrile rubber, fluororubber, EPDM rubber or silicone rubber.

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