A vehicle fuel line connection structure, fuel filler assembly, and vehicle

Abstract

The utility model provides a kind of vehicle oil pipe connecting structure, fuel pipe assembly and vehicle, the annular groove is arranged in the connecting portion of metal steel pipe in the vehicle oil pipe connecting structure, the two side walls of annular groove are radially protruding, and the inner wall of thermoplastic pipe that is sleeved in connecting portion forms the sealing cavity of assembly rubber ring, and the two side protrusions of rubber ring cooperation annular groove can effectively intercept fuel seepage.Secondly, additional multiple radial annular protrusions are added to the connecting portion to form a secondary physical barrier to permeated fuel, significantly improving the sealing reliability and completely solving the oil leakage hazard.Meanwhile, the thermoplastic pipe is designed with a corrugated structure to give it a flexible bending characteristic, making it easy to install in complex spaces.The metal steel pipe and the thermoplastic pipe use cold plug-in technology, which is easy and fast to operate.

Description

Technical Field

[0001] This utility model relates to the field of vehicle parts technology, and further to a vehicle oil pipe connection structure, a refueling pipe assembly, and a vehicle. Background Technology

[0002] The connection between a vehicle's fuel tank and external fuel delivery system typically combines a rigid metal hose with a flexible rubber hose. This combination aims to balance the strength of the rigid hose with the flexibility of the hose to accommodate the complex assembly space of the vehicle and potential slight displacement. However, there is a potential sealing issue at the joint between the two types of tubing. To ensure reliable fuel delivery and prevent loosening due to vibration, temperature changes, or bumps, traditional solutions usually rely on fasteners such as clamps to compress the joint. However, this type of fastening method has significant drawbacks:

[0003] 1. Reliability risk: Fasteners that are aged, corroded, or improperly installed may cause seal failure;

[0004] 2. Long-term maintenance issues: Under long-term vibration conditions, the clamps are prone to stress relaxation, and the sealing pressure gradually decreases, creating a potential leakage risk.

[0005] 3. Complex installation: It requires precise alignment and additional tightening operations (such as bolt tightening or clip locking), which increases the difficulty of assembly and labor costs;

[0006] Therefore, there is an urgent need for an oil pipe connection design that combines long-lasting sealing with efficient assembly, which can simplify the installation process and fundamentally improve leak-proof safety. Utility Model Content

[0007] In view of the lack of the above-mentioned related technologies, the purpose of this disclosure is to provide a vehicle oil pipe connection structure, an oil filling pipe assembly, and a vehicle, thereby solving the problems in the related technologies. To achieve the above objective, this utility model adopts the following technical solution:

[0008] A vehicle oil pipe connection structure includes: a metal steel pipe, one end of which has a connecting portion, the connecting portion having at least one annular groove on its wall, and the pipe walls on both sides of the annular groove protruding radially from the wall of the metal steel pipe; a thermoplastic pipe, one end of which is fitted onto the connecting portion of the metal steel pipe, the inner wall of which, together with the annular groove, forms a receiving cavity; and a rubber ring, which is filled into the receiving cavity.

[0009] In some technical solutions, at least one annular protrusion is also provided on the connecting portion away from the annular groove.

[0010] In some technical solutions, multiple annular protrusions are spaced apart along the axial direction of the connecting portion.

[0011] In some technical solutions, the thermoplastic tube has a corrugated structure at one end away from the connection portion, and the corrugated structure consists of several segments that protrude radially from the wall of the thermoplastic tube.

[0012] In some technical solutions, the rubber ring is an O-ring.

[0013] In some technical solutions, the thermoplastic tube is a nylon tube.

[0014] This utility model also discloses a refueling pipe assembly, including a metal steel pipe, a thermoplastic plastic pipe and a rubber ring. One end of the metal steel pipe is connected to an external fuel delivery device, and one end of the thermoplastic plastic pipe is connected to the vehicle's fuel tank. The metal steel pipe and the thermoplastic plastic pipe are connected by the aforementioned vehicle fuel pipe connection structure.

[0015] In some technical solutions, the thermoplastic tube is provided with a tapered section, an intermediate section and a widening section connected in sequence along its axial direction, and the tapered section is connected to the opening of the connecting part.

[0016] This utility model also discloses a vehicle, including a fuel tank, which is connected to an external fuel delivery device via the aforementioned fuel filling pipe assembly.

[0017] In some technical solutions, the thermoplastic tube is provided with a tapered section, an intermediate section and a widening section connected in sequence along its axial direction, and the tapered section is connected to the opening of the connecting part.

[0018] Compared with the prior art, the present invention can bring the following beneficial effects:

[0019] 1. The oil pipe connection structure provided by this utility model has an annular groove at the connection part of the metal steel pipe. The pipe walls on both sides of the annular groove protrude radially from the pipe wall of the metal steel pipe. When the thermoplastic plastic pipe is fitted into the connection part of the metal steel pipe, the inner wall of the thermoplastic plastic pipe and the annular groove form a cavity for filling a rubber ring. The rubber ring can be placed in the annular groove before fitting. After fitting, the rubber ring is tightly pressed against the annular groove and the inner wall of the thermoplastic plastic pipe. When the external oil supply device inputs fuel into the thermoplastic plastic pipe, when the fuel flows through the joint between the metal steel pipe and the thermoplastic plastic pipe, the fuel is effectively prevented from seeping out from the joint by the interception action of the rubber ring and the two protruding side walls of the annular groove, thus achieving an excellent sealing effect.

[0020] 2. In order to further improve the sealing performance of the connection structure, this utility model also provides multiple annular protrusions that protrude radially along the metal steel pipe on the connection part away from the annular groove. Once a small amount of fuel bypasses the rubber ring and the protruding sidewall of the annular groove, the annular protrusions can also physically block the fuel from seeping out.

[0021] 3. In the oil pipe connection structure provided by this utility model, the metal steel pipe and the thermoplastic plastic pipe are connected by cold plugging, which does not require heating and welding, thus avoiding problems such as heat deformation and oxidation. Moreover, the connection operation is simple and quick.

[0022] 4. The thermoplastic pipe provided by this utility model also has a corrugated structure, which gives the thermoplastic pipe bending flexibility. When it is necessary to connect the thermoplastic pipe to an external oil conveying device, the user can easily bend and adjust the angle to adapt to various complex installation spaces and layout requirements.

[0023] 5. This utility model also provides a refueling pipe assembly and vehicle using the oil pipe connection structure. Because the oil pipe connection structure has excellent sealing performance, it can effectively prevent oil leakage. Moreover, the pipe connection operation is simple, which greatly improves the assembly efficiency. Attached Figure Description

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 A schematic diagram of the vehicle oil pipe connection structure provided by this utility model;

[0026] Figure 2 Cross-sectional view of the vehicle oil pipe connection structure provided by this utility model;

[0027] Figure 3 A schematic diagram of the structure of the metal steel pipe provided by this utility model;

[0028] Figure 4 A cross-sectional view of the metal steel pipe provided for this utility model;

[0029] Figure 5 A schematic diagram of the metal steel pipe provided by this utility model in another embodiment;

[0030] Figure 6 A cross-sectional view of the thermoplastic tube provided by this utility model.

[0031] Figure Labels

[0032] 10—Metal pipe; 101—Connecting part; 1011—Annular groove; 10111—Receiving cavity; 1012—Annular protrusion;

[0033] 20—Rubber ring;

[0034] 30—Thermoplastic pipe; 301—Corrugated structure; 302—Constriction section; 303—Intermediate section; 304—Expansion section. Detailed Implementation

[0035] The present invention will be further described below with reference to specific embodiments, but these embodiments are merely exemplary and do not constitute any limitation on the scope of the present invention. Those skilled in the art should understand that various improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

[0036] This utility model provides a vehicle, which includes a fuel tank and a refueling hose assembly connected to the fuel tank. In actual refueling operations, external fuel is introduced into the fuel tank through the refueling hose assembly.

[0037] Combination Figure 1-6 As shown, the refueling hose assembly includes a thermoplastic pipe 30 connected to the fuel tank, a metal steel pipe 10 connected to the thermoplastic pipe 30 and the external fuel delivery device, and a rubber ring 20. The metal steel pipe 10, the thermoplastic pipe 30, and the rubber ring 20 are connected by a vehicle fuel hose connection structure provided by this invention. Specifically, the metal steel pipe 10 is designed with a double-opening structure, one opening for connection to the external fuel delivery device as a fuel inlet; and the other end has a connecting part 101 for connection to the thermoplastic pipe 30, such as... Figure 3 and Figure 4 As shown, the connecting part 101 has at least one annular groove 1011 on its pipe wall, and the pipe walls on both sides of the annular groove 1011 protrude radially from the pipe wall of the metal steel pipe 10.

[0038] One end of the thermoplastic tube 30 is fitted onto the connecting part 101 of the metal steel pipe 10, and the other end is connected to the fuel tank. When the thermoplastic tube 30 is fitted onto the connecting part 101, the inner wall of the thermoplastic tube 30 and the annular groove 1011 form a receiving cavity 10111, and the rubber ring 20 is filled into the receiving cavity 10111. When the external fuel supply device supplies fuel to the thermoplastic tube 30 through the metal steel pipe 10, when the fuel flows to the joint between the metal steel pipe 10 and the thermoplastic tube 30, it first encounters a primary barrier formed by the protruding pipe wall on one side of the annular groove 1011. Subsequently, the tight fit between the rubber ring 20 and the annular groove 1011 and the inner wall of the thermoplastic tube 30 forms a secondary sealing barrier; even if a small amount of fuel leaks out, it will be intercepted by the protruding pipe wall on the other side of the annular groove 1011. This stepped sealing structure provides multiple physical barriers to the fuel, effectively preventing fuel leakage and improving the sealing performance of the connection part 101.

[0039] For example, the thermoplastic tube 30 can be a nylon tube. Compared with traditional rubber tubes, nylon tubes are more pressure-resistant and heat-resistant, and the density of nylon material is relatively low, thus effectively reducing the weight of the entire piping system.

[0040] Furthermore, the thermoplastic tube 30 has a multi-layer structure to meet the requirements of fuel permeation regulations. Exemplarily, the multi-layer structure is typically a 3-5 layer co-extruded structure, with each layer having a specific function. The first layer (inner layer) uses PA12 / PA6 + antistatic agent, requiring corrosion resistance and antistatic accumulation prevention due to direct contact with fuel. The second layer (adhesive layer) uses a special adhesive resin to enhance the adhesion between the inner and outer layers and prevent delamination. The third layer (barrier layer) blocks fuel vapor permeation. The fourth layer (reinforcing layer) uses PA12 / PA6 + glass fiber / aramid fiber to improve mechanical strength, resist bursting, and resist compression. The fifth layer (outermost layer)...

[0041] The metal steel pipe 10 and the thermoplastic plastic pipe 30 provided by this utility model adopt a cold-plug connection method, that is, they are connected together mechanically at room temperature, without the need for high-temperature processes such as heating or welding. Sealing and connection are mainly achieved through physical structure and mechanical force. Since high-temperature heating is not required, problems such as thermal deformation and oxidation that may occur during the connection process can be avoided, while also reducing the impact on material properties. Moreover, the cold-plug operation is relatively simple and quick.

[0042] For example, the rubber ring 20 can be an O-ring, such as... Figure 5 As shown, firstly, the O-ring is fitted and fixed in the annular groove 1011. Next, one end opening of the thermoplastic tube 30 is aligned with the connecting part 101 and fitted. After fitting, the O-ring is pressed between the inner wall of the thermoplastic tube 30 and the inner wall of the annular groove 1011, ensuring a tight seal at the connection. It should be noted that the size series, tolerances, and groove design of the rubber ring 20 (i.e., the O-ring) provided by this invention meet the GB3452 standard for O-ring seals for hydraulic and pneumatic applications. Simultaneously, the mating connection between the O-ring, the annular groove 1011, and the thermoplastic tube 30 also meets the requirements of fuel permeation regulations.

[0043] In some implementations, such as Figure 3-5As shown, to further enhance the sealing and reliability of the connection, at least one annular protrusion 1012 is provided on the connecting portion 101 away from the annular groove 1011. The annular protrusion 1012 forms a physical barrier on the connecting portion 101. When the thermoplastic tube 30 is fitted onto the connecting portion 101, it first passes through the area of ​​the annular groove 1011, where the rubber ring 20 is initially positioned and begins to produce a sealing effect. Subsequently, the thermoplastic tube 30 continues to advance, reaching and passing over the annular protrusion 1012. Even under ideal conditions, a very small amount of fuel may still leak from the area of ​​the annular groove 1011. Fuel that is not completely blocked by the protruding sidewalls of the annular groove 1011 and the rubber ring 20 will be intercepted when it reaches and contacts the annular protrusion 1012, ensuring that the fuel will not easily leak out, greatly improving the leak-proof level of the connection structure.

[0044] Furthermore, when multiple annular protrusions 1012 are provided, the annular protrusions 1012 are spaced apart along the axial direction of the connecting portion 101.

[0045] It should be noted that the double-sided protruding structure of the annular protrusion 1012 and the annular groove 1011 in this utility model adopts the flared (upset) connection standard conforming to DIN 3021. In specific implementation, the protruding pipe wall of the annular protrusion 1012 and the protruding pipe walls on both sides of the annular groove 1011, with their standardized dimensions, can better ensure an ideal interference fit with the inner wall of the thermoplastic pipe 30, thereby maintaining stable sealing performance under pressure fluctuations or temperature changes.

[0046] Meanwhile, the mating structure of the metal steel pipe 10 and the thermoplastic pipe 30 in this utility model, namely the design of the annular groove 1011 and its double-sided protrusions and the annular protrusion 1012, not only realizes the mechanical connection and sealing functions, but also fully complies with the current fuel permeation regulations.

[0047] like Figure 1 , Figure 2 and Figure 6As shown, the thermoplastic tube 30 has a corrugated structure 301 at one end away from the connecting portion 101. The corrugated structure 301 consists of several segments of the tube wall protruding radially from the connecting portion 101, meaning the tube wall away from the connecting portion 101 has a periodic wavy structure. For example, when the corrugated tube is subjected to axial force (tension or compression), during tension, the distance between the crests (protruding portions) and troughs (recessed portions) increases, resulting in an increase in overall length. During compression, the crests and troughs of the corrugations move closer together, shortening the overall length. When subjected to torsional force, the corrugated structure 301 can absorb rotational stress through local elastic deformation. Simultaneously, the flexibility of the thermoplastic tube 30 allows the corrugated structure 301 to deflect, thus achieving limited-angle torsion without damage. This flexible thermoplastic tube 30 can buffer vibrations from the engine and chassis, preventing fatigue fracture caused by rigid connections. Furthermore, the relative displacement between the fuel tank and the vehicle body requires flexible connection compensation. The thermoplastic tube 30 is flexible and can easily bypass the complex mechanical structure of the vehicle chassis, adapting to the layout requirements of different vehicle models.

[0048] For example, when the thermoplastic tube 30 is a nylon tube, the nylon tube has a corrugated structure 301 at the end away from the connecting part 101, and the corrugated structure 301 is a plurality of sections of the nylon tube wall that protrude outward along the radial direction of the nylon tube.

[0049] In some implementations, such as Figure 2 and Figure 6 As shown, to optimize fuel flow characteristics, the thermoplastic tube 30 is provided with a converging section 302, an intermediate section 303, and a expanding section 304 connected sequentially along its axial direction. The converging section 302 is located at the end of the thermoplastic tube 30 that needs to be connected to the metal steel pipe 10, that is, after the thermoplastic tube 30 and the metal steel pipe 10 are fitted together, the converging section 302 communicates with the opening of the connecting part 101. The flow area of ​​the converging section 302 is smaller than that of the intermediate section 303, and the flow area of ​​the expanding section 304 is larger than that of the intermediate section 303.

[0050] For example, when the thermoplastic tube 30 is fitted onto the connecting part 101, the opening on one side of the end where the tapered section 302 is located is first aligned with the opening of the connecting part 101 and smoothly pushed in. The tube wall of the thermoplastic tube 30 passes through the areas of the annular groove 1011 and the annular protrusion 1012 in sequence. As the thermoplastic tube 30 is continuously pushed in, the middle section 303 and the tapered section 302 will gradually approach the connecting part 101.

[0051] From the perspective of fuel flow direction, when the external fuel delivery device begins to supply fuel to the metal pipe 10, the fuel first flows through the converging section 302. Since the flow area of ​​the converging section 302 is smaller than that of the intermediate section 303, according to fluid mechanics principles, the fuel is accelerated here to prevent stagnation and to remove air bubbles, reducing vapor lock. Next, the high-speed fuel flows through the intermediate section 303, maintaining a stable laminar flow state and eliminating pressure fluctuations caused by turbulence. Finally, the fuel reaches the expanding section 304, where the flow velocity gradually decreases, and kinetic energy is converted into static pressure energy, thereby reducing the impact of fuel within the tank, achieving smooth fuel diffusion, and preventing splashing.

[0052] Furthermore, the expanding section 304 is positioned close to the corrugated structure 301, that is, the contracting section 302, the intermediate section 303 and the expanding section 304 are positioned in the area where they will be connected to the connecting part 101, so that the flow path of the fuel is adjusted as soon as the fuel enters the thermoplastic tube 30.

[0053] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A vehicle oil pipe connection structure, characterized in that, include: A metal steel pipe, wherein one end of the metal steel pipe has a connecting portion, and the pipe wall of the connecting portion has at least one annular groove, and the pipe walls on both sides of the annular groove protrude radially from the pipe wall of the metal steel pipe; A thermoplastic tube, one end of which is fitted onto the connection part of the metal steel pipe, wherein the inner wall of the thermoplastic tube and the annular groove form a receiving cavity. A rubber ring is filled into the receiving cavity.

2. The vehicle oil pipe connection structure according to claim 1, characterized in that, At least one annular protrusion is also provided on the connecting portion away from the annular groove.

3. The vehicle oil pipe connection structure according to claim 2, characterized in that, The plurality of the annular protrusions are spaced apart along the axial direction of the connecting portion.

4. The vehicle oil pipe connection structure according to claim 1, characterized in that, The thermoplastic tube has a corrugated structure at one end away from the connection portion, the corrugated structure being several segments that protrude radially from the tube wall of the thermoplastic tube.

5. The vehicle oil pipe connection structure according to claim 1, characterized in that, The rubber ring is an O-ring.

6. The vehicle oil pipe connection structure according to any one of claims 1-5, characterized in that, The thermoplastic tube is a nylon tube.

7. A refueling pipe assembly, characterized in that, It includes a metal steel pipe, a thermoplastic plastic pipe, and a rubber ring. One end of the metal steel pipe is connected to an external oil delivery device, and one end of the thermoplastic plastic pipe is connected to the vehicle's fuel tank. The metal steel pipe and the thermoplastic plastic pipe are connected by the vehicle oil pipe connection structure according to any one of claims 1-6.

8. The refueling pipe assembly according to claim 7, characterized in that, Also includes: The thermoplastic tube is provided with a tapered section, an intermediate section and a widening section connected in sequence along its axial direction, and the tapered section is connected to the opening of the connecting part.

9. A vehicle, characterized in that, Includes a fuel tank, which is connected to an external fuel delivery device via a fuel filling pipe assembly as described in any one of claims 7-8.

10. The vehicle according to claim 9, characterized in that, Also includes: The thermoplastic tube is provided with a tapered section, an intermediate section and a widening section connected in sequence along its axial direction, and the tapered section is connected to the opening of the connecting part.

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