Diesel automobile fuel tank structure

Abstract

The invention discloses an oil tank structure of a diesel car. The oil tank structure comprises an oil tank body, an oil outlet pipe, an oil return pipe, a filter screen cylinder and a protection assembly. An oil outlet hole and an oil return hole are formed in the oil tank body, the oil outlet hole is located in the middle of the oil tank body, the oil return hole is formed in the outer edge close to the oil tank body, and the oil return pipe is communicated with the oil return hole; the protection assembly comprises a sealing piece and an anti-impact plate, the sealing piece is arranged in the oil outlet hole, a mounting hole is formed in the sealing piece, the oil outlet pipe penetrates through the mounting hole and is inserted into the oil tank body, the oil outlet pipe is connected with the filter screen cylinder, and the anti-impact plate is located on the periphery of the filter screen cylinder. By arranging the anti-impact plate on the periphery of the filter screen cylinder, direct impact of fuel oil on the filter screen cylinder and the lower end of the oil outlet pipe under the working conditions of rapid acceleration and rapid deceleration of a vehicle can be effectively blocked, transverse acting force borne by the bottom of the oil outlet pipe is reduced, and the shaking amplitude of the oil outlet pipe is reduced; and the adverse effect on the sealing part at the upper end caused by the swing of the oil outlet pipe is reduced fundamentally.

Description

Technical Field

[0001] This invention relates to the field of automotive technology, and more specifically, to a diesel vehicle fuel tank structure. Background Technology

[0002] As a crucial component in automobiles for storing and transporting fuel, the diesel fuel tank's internal structure is directly related to fuel management and safety. In modern automotive design, cost, safety, and usage requirements profoundly influence fuel tank selection. From a cost perspective, steel fuel tanks are generally the cheapest, with plastic and aluminum alloy tanks increasing in cost in that order. Furthermore, steel and aluminum alloy tanks are widely used because some internal structures can be welded, eliminating the need for mold development. From a safety perspective, all fuel tank materials must meet the GB 18296 national standard. From a usage perspective, some customers in northern regions require steel fuel tanks because they need to add a fire to the bottom of the tank to warm it.

[0003] Because diesel engines return fuel that is high-temperature and contains air bubbles, to prevent it from being sucked into the fuel suction pipe and causing hot oil circulation, which can lead to fuel pump cavitation and reduced engine power, the industry standard design separates the fuel tank's outlet and return pipes. The outlet pipe is located in the middle of the fuel tank, while the return pipe is at the end of the tank closer to the engine. To ensure the fuel exiting through the outlet pipe is clean without affecting the refueling speed, a fuel suction filter is typically fitted to the bottom of the outlet pipe. Due to the large diameter of the filter and ease of replacement, the outlet pipe can only be sealed with a gasket.

[0004] However, in existing technologies, compared to the return fuel line and fuel level sensor, the fuel filter at the bottom of the fuel outlet pipe is always fixed to the bottom of the fuel tank, resulting in a larger contact area with the fuel. During rapid acceleration / deceleration of the vehicle, the bottom of the fuel outlet pipe experiences significant impact from the reciprocating fuel flow. Furthermore, as the fuel outlet pipe is the longest pipe inside the fuel tank with a long cantilever, the sealing structure at its upper end requires greater precision. During rapid acceleration / deceleration, the fuel outlet pipe can wobble, and as the fuel sloshes, the fuel level at the upper end fills the gap between the sealing ring and the stamped end cap. This fuel accumulation in the gap, combined with the wobble of the fuel outlet pipe, can cause fuel leakage at the sealing ring, leading to customer concerns.

[0005] Therefore, how to provide a diesel vehicle fuel tank structure has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] The purpose of this invention is to provide a new technical solution for the structure of diesel vehicle fuel tanks.

[0007] According to a first aspect of the present invention, a diesel vehicle fuel tank structure is provided, comprising: a fuel tank body, a fuel outlet pipe, a fuel return pipe, a filter screen, and a protective assembly;

[0008] The oil tank body is provided with an oil outlet and an oil return hole. The oil outlet is located in the middle of the oil tank body, and the oil return hole is located near the outer edge of the oil tank body. The oil return pipe is connected to the oil return hole.

[0009] The protective component includes a seal and an anti-impact plate. The seal is disposed in the oil outlet hole and has an installation hole. The oil outlet pipe passes through the installation hole and is inserted into the oil tank body. The oil outlet pipe is connected to the filter screen cylinder. The anti-impact plate is located on the outer periphery of the filter screen cylinder to prevent liquid from directly impacting the filter screen cylinder.

[0010] Optionally, the impact-resistant plate has an arc-shaped structure, and the arc-shaped structure is C-shaped or U-shaped.

[0011] Optionally, the shock-absorbing plate is connected to the bottom of the oil tank body, and there are two shock-absorbing plates located on both sides of the filter cylinder.

[0012] Optionally, the height of the impact-resistant plate is greater than the height of the filter cylinder;

[0013] The impact-resistant plate has multiple reinforcing ribs on its side wall.

[0014] Optionally, the protective assembly further includes a fixing post, the first end of which is connected to the top of the impact-resistant plate, and the second end of which is connected to the bottom of the fuel tank body.

[0015] Optionally, the oil tank body is provided with a boss at the position of the oil outlet;

[0016] The protective assembly also includes a fixing plate and fasteners. The bottom of the seal is inserted into the oil outlet hole. The fixing plate is connected to the top of the seal. The fasteners are arranged circumferentially along the fixing plate and pass through the fixing plate and the seal, and are connected to the boss.

[0017] Optionally, the sealing element includes a connecting portion and a protruding portion, the protruding portion being connected to the connecting portion, the connecting portion being located between the fixing plate and the boss, the protruding portion having a trapezoidal structure, and the protruding portion being inserted into the oil outlet hole.

[0018] Optionally, the diesel vehicle fuel tank structure further includes two baffles, which are disposed inside the fuel tank body and divide the fuel tank body into an installation cavity and a partition cavity. The fuel outlet pipe, the filter screen cylinder, and the shock-absorbing plate are all located in the installation cavity, and the fuel return pipe is located in the partition cavity.

[0019] The baffle has connection ports at both opposite corners.

[0020] Optionally, the diesel vehicle fuel tank structure further includes a fuel level sensor, which is located on the top of the fuel tank body and near the return fuel pipe. The fuel level sensor penetrates the fuel tank body and is inserted into the partition cavity.

[0021] Optionally, the diesel vehicle fuel tank structure further includes a vent valve, which is located on the top of the fuel tank body.

[0022] The beneficial effects of this invention are as follows:

[0023] This invention features an oil outlet located in the center of the fuel tank body, a return oil outlet near the outer edge of the fuel tank body, and a return oil pipe connected to the return oil outlet. A seal is placed in the oil outlet outlet, and the oil outlet pipe passes through a mounting hole and is inserted into the fuel tank body, connected to a filter screen. An anti-impact plate is located on the outer periphery of the filter screen. During use, fuel is stored in the fuel tank body. During engine operation, the fuel is filtered by the filter screen and then delivered to the engine via the oil outlet pipe. The high-temperature return oil after engine operation flows back to the edge of the fuel tank body via the return oil pipe, separating it from the fuel at the oil outlet pipe. This prevents the high-temperature return oil from being directly sucked into the oil outlet pipe, thus preventing fuel pump cavitation and engine power reduction.

[0024] During vehicle operation, when there is rapid acceleration, rapid deceleration, or bumpy conditions, the fuel in the fuel tank will slosh back and forth. At this time, the anti-impact plate located on the outer periphery of the filter screen can block and guide the impact of the fuel, preventing the fuel from directly impacting the outer wall of the filter screen, reducing the impact force on the filter screen and the lower end of the fuel outlet pipe, thereby suppressing the overall sloshing of the fuel outlet pipe.

[0025] After the amplitude of the oil outlet pipe swaying is reduced, the fit between the upper seal and the oil outlet hole of the oil tank body is more stable, and fuel is less likely to enter and accumulate in the gap between the seal and the stamped end cap, thereby avoiding oil leakage at the seal due to the swaying of the oil outlet pipe and ensuring reliable sealing of the oil tank.

[0026] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0028] Figure 1 This is a structural diagram of the diesel vehicle fuel tank structure of the present invention;

[0029] Figure 2 This is a structural diagram of the sealing element of the present invention.

[0030] The following are marked in the diagram: 1. Oil tank body; 11. Boss; 12. Mounting cavity; 13. Separation cavity; 2. Oil outlet pipe; 3. Oil return pipe; 4. Filter screen cylinder; 5. Protective components; 51. Seal; 511. Connecting part; 512. Boss; 52. Shockproof plate; 53. Fixing post; 54. Fixing plate; 55. Fastener; 6. Baffle; 7. Connection port; 8. Oil quantity sensor; 9. Vent valve. Detailed Implementation

[0031] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0032] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0033] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0034] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0035] like Figure 1 and Figure 2 As shown, this embodiment of the invention provides a diesel vehicle fuel tank structure, including: a fuel tank body 1, an outlet pipe 2, a return pipe 3, a filter screen 4, and a protective component 5;

[0036] The oil tank body 1 is provided with an oil outlet and an oil return hole. The oil outlet is located in the middle of the oil tank body 1, and the oil return hole is located near the outer edge of the oil tank body 1. The oil return pipe 3 is connected to the oil return hole.

[0037] The protective component 5 includes a seal 51 and an anti-impact plate 52. The seal 51 is disposed in the oil outlet hole and has an installation hole. The oil outlet pipe 2 passes through the installation hole and is inserted into the oil tank body 1. The oil outlet pipe 2 is connected to the filter screen cylinder 4. The anti-impact plate 52 is located on the outer periphery of the filter screen cylinder 4 to prevent liquid from directly impacting the filter screen cylinder 4.

[0038] During use, fuel is stored in the fuel tank body 1. During engine operation, fuel is filtered by the filter screen 4 and then delivered to the engine through the fuel outlet pipe 2. The high-temperature return fuel after engine operation flows back to the fuel tank body 1 near the edge through the return fuel pipe 3, separating it from the fuel at the fuel outlet pipe 2. This prevents the high-temperature return fuel from being directly sucked into the fuel outlet pipe 2, thus preventing fuel pump cavitation and engine power reduction.

[0039] During vehicle operation, when there is rapid acceleration, rapid deceleration, or bumpy conditions, the fuel in the fuel tank body 1 will sway back and forth. At this time, the anti-impact plate 52 located on the outer periphery of the filter screen 4 blocks and guides the impact of the fuel, preventing the fuel from directly impacting the outer wall of the filter screen 4, reducing the impact force on the filter screen 4 and the lower end of the fuel outlet pipe 2, thereby suppressing the overall swaying of the fuel outlet pipe 2.

[0040] After the amplitude of the swaying of the oil outlet pipe 2 is reduced, the fit between the upper seal 51 and the oil outlet hole of the oil tank body 1 is more stable, and fuel is less likely to enter and accumulate in the gap between the seal 51 and the stamped end cap, thereby avoiding oil leakage at the seal due to the swaying of the oil outlet pipe 2 and ensuring reliable sealing of the oil tank.

[0041] The present invention places the oil outlet hole in the middle of the oil tank body 1, sets the oil return hole near the outer edge of the oil tank body 1, and connects the oil return pipe 3 to the oil return hole; and sets the sealing element 51 in the oil outlet hole, the oil outlet pipe 2 passes through the mounting hole and is inserted into the oil tank body 1, and the oil outlet pipe 2 is connected to the filter screen cylinder 4, and the anti-impact plate 52 is located on the outer periphery of the filter screen cylinder 4.

[0042] By setting an anti-impact plate 52 on the outer periphery of the filter cylinder 4, the present invention can effectively block the direct impact of fuel on the filter cylinder 4 and the lower end of the oil outlet pipe 2 under the condition of rapid acceleration and deceleration of the vehicle, reduce the lateral force on the bottom of the oil outlet pipe 2, reduce the shaking amplitude of the oil outlet pipe 2, and reduce the adverse effects on the upper sealing part caused by the shaking of the oil outlet pipe 2 from the root.

[0043] When the shaking of the oil outlet pipe 2 is reduced, fuel accumulation and compression can be avoided due to oil fluctuations and pipe swaying, preventing the gap between the seal 51 and the stamped end cap from being affected by oil fluctuations and pipe swaying. This significantly improves the problem of oil seepage and leakage at the sealing ring, enhances the overall sealing reliability and safety of the fuel tank, and eliminates user concerns. The anti-impact plate 52 only serves to guide, buffer, and shield the fuel flow; it does not block the oil inlet area of ​​the filter screen 4 and does not affect the fuel intake efficiency or refueling speed, achieving structural protection while ensuring unobstructed fuel supply.

[0044] Furthermore, the present invention has a simple structure, requiring no changes to the original fuel tank material, the arrangement of the oil outlet pipe 2 and the oil return pipe 3, or the sealing installation method. It is compatible with existing mainstream welded fuel tanks such as iron fuel tanks and aluminum alloy fuel tanks, requires no additional mold development, has low modification costs, strong versatility, and is easy to promote and apply directly to existing vehicle models.

[0045] In one embodiment of the diesel vehicle fuel tank structure of the present invention, the shock-absorbing plate 52 is arc-shaped, and the arc-shaped structure is C-shaped or U-shaped.

[0046] The anti-impact plate 52 of the present invention adopts an arc-shaped, C-shaped or U-shaped structure, which can guide, divert and buffer the fuel impact, prevent the fuel from directly impacting the filter screen cylinder 4, greatly reduce the impact force on the lower end of the oil outlet pipe 2, and reduce the shaking of the oil outlet pipe 2 from the source.

[0047] Specifically, the arc-shaped anti-impact plate 52 can be set on both sides of the filter cylinder 4, and can also partially surround the filter cylinder 4, which ensures that the circumferential oil inlet area of ​​the filter cylinder 4 is sufficient and does not affect the oil supply flow and filling speed, while also forming effective protection in the direction of vehicle travel, taking into account both oil suction efficiency and impact resistance.

[0048] Furthermore, the curved surface has no sharp corners, low stress, high structural strength, and is not easily deformed, resulting in better stability under long-term fuel impact and vibration conditions, thus extending service life. The impact-resistant plate 52 of this invention has a simple structure and is easy to process and form. It can be directly welded or fixed to the bottom of the fuel tank, and is compatible with existing structures such as iron fuel tanks and aluminum alloy fuel tanks. No mold is required, resulting in low cost and strong versatility. It can also further stabilize the posture of the fuel outlet pipe 2, reduce the swing and compression at the upper sealing point, prevent oil leakage from the sealing ring, and improve the sealing reliability of the fuel tank and driving safety.

[0049] In this embodiment, the anti-impact plate 52 has a C-shaped structure and is disposed on both sides of the filter cylinder 4. The concave surface of the anti-impact plate 52 is against the oil outlet pipe 2. When the fuel impacts the filter cylinder 4 at the bottom of the oil outlet pipe 2 back and forth, the fuel is first guided by the anti-impact plate 52 and rises along the curved surface, reducing the impact force of the fuel on the filter cylinder 4.

[0050] It should be noted that when the shock absorber 52 has a U-shaped structure, the shock absorber 52 can fully surround the filter screen cylinder 4, thereby completely preventing the fuel from impacting the filter screen cylinder 4.

[0051] In one embodiment of the diesel vehicle fuel tank structure of the present invention, the shock-absorbing plate 52 is connected to the bottom of the fuel tank body 1, and there are two shock-absorbing plates 52 located on both sides of the filter cylinder 4.

[0052] The impact-resistant plate 52 of the present invention is directly connected to the bottom of the fuel tank body 1, which is firmly fixed and highly reliable. It is not easy to loosen under long-term fuel impact and vehicle bumpy conditions, thus ensuring a stable protective effect.

[0053] Furthermore, two anti-impact plates 52 are symmetrically arranged on both sides of the filter cylinder 4, which can simultaneously resist bidirectional fuel impact during vehicle acceleration and deceleration, comprehensively reducing the force and shaking on the filter cylinder 4 and the lower end of the oil outlet pipe 2, providing more comprehensive protection. The anti-impact plates 52 arranged on both sides can limit and guide the filter cylinder 4, constrain the radial swing amplitude of the oil outlet pipe 2, reduce the risk of oil leakage caused by frequent shaking at the upper sealing part, and improve sealing stability.

[0054] The two impact-resistant plates are symmetrically arranged, ensuring even stress distribution, preventing deformation, increasing structural strength, and extending the service life of internal components of the fuel tank.

[0055] In one embodiment of the diesel vehicle fuel tank structure of the present invention, the height of the impact plate 52 is greater than the height of the filter cylinder 4.

[0056] Multiple reinforcing ribs are provided on the side wall of the impact plate 52.

[0057] Specifically, the anti-impact plate 52 extends beyond the filter cylinder 4. Whether the vehicle accelerates or decelerates rapidly, causing significant fuel sloshing, or experiences fuel wave impact due to driving bumps, it prevents fuel from directly washing against the outer wall of the filter cylinder 4. This avoids concentrated local impact force at the connection between the filter cylinder 4 and the fuel outlet pipe 2, fundamentally weakening the lateral thrust of fuel on the lower end of the fuel outlet pipe 2, further reducing the overall sloshing amplitude of the fuel outlet pipe 2, and strengthening the protection of the upper sealing structure. It also effectively prevents sloshing fuel from splashing upwards and bypassing the filter cylinder 4 to directly impact the lower section of the fuel outlet pipe 2, preventing fuel from spreading upwards along the pipe wall of the fuel outlet pipe 2, reducing the amount of fuel accumulation in the gap between the sealing ring and the stamped end cap. Combined with the reduced sloshing amplitude of the fuel outlet pipe 2, this double-layered protection eliminates oil seepage and leakage problems at the sealing points, completely eliminating customer concerns.

[0058] Furthermore, in response to the repeated fuel impacts and vehicle vibrations during long-term vehicle operation, the multiple reinforcing ribs added to the side wall can effectively disperse the impact force on the shock-absorbing plate 52, preventing the plate from bending, deforming, loosening, or even breaking due to long-term stress. This ensures the long-term stable protective performance of the shock-absorbing plate 52, extends the overall service life of the internal components of the fuel tank, and reduces later maintenance costs.

[0059] The reinforcing ribs can enhance the rigidity of the anti-impact plate 52, reduce the self-vibration of the plate when it is impacted by fuel, prevent the anti-impact plate 52 from resonating with the oil outlet pipe 2 and the fuel tank body 1, further weaken the shaking frequency and amplitude of the oil outlet pipe 2, and at the same time reduce the fatigue damage of vibration to the upper sealing gasket and extend the service life of the seal 51.

[0060] In one embodiment of the diesel vehicle fuel tank structure of the present invention, the protective component 5 further includes a fixing post 53, the first end of the fixing post 53 being connected to the top of the impact plate 52, and the second end of the fixing post 53 being connected to the bottom of the fuel tank body 1.

[0061] By adding a fixing post 53 between the top of the anti-impact plate 52 and the bottom of the fuel tank body 1, the present invention can provide bidirectional support and positioning for the anti-impact plate 52, significantly improving the installation firmness of the anti-impact plate 52 and preventing the anti-impact plate 52 from tilting, deforming, shaking or falling off under long-term fuel impact and vehicle bumps and vibrations, thus ensuring the long-term stability and reliability of the protective structure.

[0062] The fixed column 53 pulls / supports and limits the upper end of the anti-impact plate 52, which can effectively reduce the vibration amplitude and swing of the anti-impact plate 52 itself, avoid collision or interference between the anti-impact plate 52 and the filter screen cylinder 4 and the oil outlet pipe 2, further reduce the overall shaking of the oil outlet pipe 2, reduce the stress on the upper sealing part, and reduce the risk of oil leakage.

[0063] Furthermore, the fixed column 53, together with the impact plate 52 and the fuel tank body 1, forms a stable frame support structure, which greatly improves the overall rigidity and impact resistance of the protective component 5. Even under harsh conditions such as rapid acceleration / deceleration of the vehicle and heavy-load driving, the structure can still maintain stability and extend the service life of the internal pipelines and seals 51 of the fuel tank.

[0064] In one embodiment of the diesel vehicle fuel tank structure of the present invention, a boss 11 is provided on the fuel tank body 1 at the position of the fuel outlet. Specifically, the boss 11 on the fuel tank body 1 at the position of the fuel outlet can improve the structural strength at the position of the fuel outlet, prevent the fuel tank body 1 from deforming due to force at the fuel outlet, and at the same time provide a stable and reliable mounting base for the seal 51 and the fixing plate 54, thereby improving the sealing assembly accuracy.

[0065] The protective component 5 also includes a fixing plate 54 and a fastener 55. The bottom of the seal 51 is inserted into the oil outlet hole. The fixing plate 54 is connected to the top of the seal 51. The fastener 55 is arranged along the circumference of the fixing plate 54 and passes through the fixing plate 54 and the seal 51, and is connected to the boss 11.

[0066] Specifically, the bottom of the seal 51 is inserted into the oil outlet hole, and with the clamping structure of the fixing plate 54 and the boss 11, the seal 51 is positioned more accurately and assembled more firmly, effectively preventing the seal 51 from shifting or lifting during vehicle vibration, and ensuring long-term stable contact of the sealing area.

[0067] The fixing plate 54 fits against the top of the seal 51, and the fastener 55 passes through the fixing plate 54 and the seal 51 in the circumferential direction and is connected to the boss 11 to form a uniform circumferential clamping force, so that the seal 51 is subjected to uniform force, which greatly improves the sealing reliability and avoids sealing failure and oil leakage due to uneven local pressure or shaking of the oil outlet pipe 2.

[0068] In one embodiment of the diesel vehicle fuel tank structure of the present invention, the sealing member 51 includes a connecting part 511 and a protrusion part 512. The protrusion part 512 is connected to the connecting part 511. The connecting part 511 is located between the fixing plate 54 and the boss 11. The protrusion part 512 has a trapezoidal structure and is inserted into the oil outlet hole.

[0069] Specifically, the seal 51 is made of rubber or fluororubber material that is resistant to diesel corrosion, high and low temperatures, and has excellent elasticity. Specifically, it can be one of nitrile rubber (NBR), fluororubber (FKM), or hydrogenated nitrile rubber (HNBR). This type of material has excellent fuel resistance, aging resistance, and resistance to compression set. It can maintain stable elasticity under long-term diesel immersion, high engine temperature conduction, and low temperature environments in northern regions, ensuring long-term reliable sealing.

[0070] The sealing element 51 of the present invention adopts a split structure of connecting part 511 and protrusion part 512. The connecting part 511 is sandwiched between the fixing plate 54 and the protrusion 11 to achieve end face sealing; the protrusion part 512 is inserted into the oil outlet hole to form radial sealing. The double sealing structure greatly improves the sealing reliability and effectively avoids oil seepage and leakage.

[0071] Furthermore, the convex part 512 adopts a trapezoidal structure, which has a guiding and positioning function when inserted into the oil outlet hole, facilitating assembly, reducing installation difficulty, and improving assembly efficiency. The trapezoidal convex part 512 becomes tighter as it is inserted further in, which can adapt to the size deviation of the oil outlet hole. It can still maintain a tight fit under conditions of vehicle vibration and slight shaking of the oil outlet pipe 2, ensuring stable sealing performance and preventing failure.

[0072] In one embodiment of the diesel vehicle fuel tank structure of the present invention, the diesel vehicle fuel tank structure further includes two baffles 6, which are disposed inside the fuel tank body 1 and divide the fuel tank body 1 into an installation cavity 12 and a partition cavity 13. The oil outlet pipe 2, the filter screen cylinder 4, and the anti-impact plate 52 are all located in the installation cavity 12, and the oil return pipe 3 is located in the partition cavity 13.

[0073] Connection ports 7 are provided at both opposite corners of the baffle 6.

[0074] This invention divides the interior of the fuel tank into an installation chamber 12 and a separation chamber 13 by installing two baffles 6 inside the fuel tank body 1. This places the fuel outlet pipe 2, filter screen 4, anti-impact plate 52, and return fuel pipe 3 in different chambers, completely isolating the fuel outlet pipe 2 and return fuel pipe 3 spatially. This prevents the high-temperature, air-filled return fuel from being directly sucked into the fuel outlet pipe 2, effectively preventing problems such as hot oil circulation, fuel pump cavitation, and engine power reduction, and significantly improving fuel supply stability and engine reliability. The baffles 6 can also prevent fuel fluctuations in the return fuel area from being directly transmitted to the installation chamber 12, reducing the impact of return fuel impact and vehicle movement on the fuel outlet pipe 2 and filter screen 4, further reducing the shaking amplitude of the fuel outlet pipe 2, reducing the stress on the upper sealing part, and reducing the risk of oil leakage.

[0075] Furthermore, connection ports 7 are provided at the two opposite corners of the baffle 6, which not only ensures that the fuel can flow normally between the mounting cavity 12 and the partition cavity 13 and that the fuel level remains consistent, without affecting the vehicle's fuel level display and fuel supply, but also reduces the speed of fuel flow between the two cavities, further weakening the impact of oil sloshing on the oil outlet pipe 2, thus taking into account both oil balance and buffering and vibration reduction effects.

[0076] In one embodiment of the diesel vehicle fuel tank structure of the present invention, the diesel vehicle fuel tank structure further includes a fuel level sensor 8, which is disposed on the top of the fuel tank body 1 and near the return fuel pipe 3. The fuel level sensor 8 penetrates the fuel tank body 1 and is inserted into the partition cavity 13.

[0077] This invention arranges the fuel level sensor 8 within the partition cavity 13, close to the return oil pipe 3. This avoids interference from components such as the oil outlet pipe 2, filter screen 4, and shock absorber 52, providing more ample assembly space and facilitating disassembly and maintenance. The partition cavity 13 primarily serves as the engine's return oil area, where oil flow is stronger and oil level fluctuations are more stable. Operating in this environment, the fuel level sensor 8 achieves more accurate fuel level detection and a more stable signal, thus improving the overall fuel gauge display accuracy.

[0078] The fuel level sensor 8 and the fuel outlet pipe 2 are located in different chambers to avoid interference or collision between the sensor probe and the fuel outlet pipe 2 due to shaking or fuel impact, thereby reducing the risk of sensor damage and improving service life and operational reliability.

[0079] In one embodiment of the diesel vehicle fuel tank structure of the present invention, the diesel vehicle fuel tank structure further includes a vent valve 9, which is disposed on the top of the fuel tank body 1.

[0080] This invention features a vent valve 9 at the top of the fuel tank body 1, which maintains pressure balance between the inside of the fuel tank and the outside atmosphere. This prevents negative pressure from forming inside the fuel tank due to fuel consumption, ensuring that fuel can be smoothly drawn into the fuel outlet pipe 2, thus preventing problems such as insufficient fuel supply and engine stalling. Furthermore, the vent valve 9 is located at the top of the fuel tank, above the fuel level, allowing only gas to pass through and preventing fuel leakage, thereby improving the safety of the fuel tank.

[0081] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A diesel vehicle fuel tank structure, characterized in that, include: Fuel tank body, oil outlet pipe, oil return pipe, filter screen cylinder and protective components; The oil tank body is provided with an oil outlet and an oil return hole. The oil outlet is located in the middle of the oil tank body, and the oil return hole is located near the outer edge of the oil tank body. The oil return pipe is connected to the oil return hole. The protective component includes a seal and an anti-impact plate. The seal is disposed in the oil outlet hole and has an installation hole. The oil outlet pipe passes through the installation hole and is inserted into the oil tank body. The oil outlet pipe is connected to the filter screen cylinder. The anti-impact plate is located on the outer periphery of the filter screen cylinder to prevent liquid from directly impacting the filter screen cylinder.

2. The diesel vehicle fuel tank structure according to claim 1, characterized in that, The impact-resistant plate has an arc-shaped structure, which can be C-shaped or U-shaped.

3. The diesel vehicle fuel tank structure according to claim 1, characterized in that, The shock-absorbing plate is connected to the bottom of the oil tank body, and there are two shock-absorbing plates located on both sides of the filter cylinder.

4. The diesel vehicle fuel tank structure according to claim 1, characterized in that, The height of the impact-resistant plate is greater than the height of the filter cylinder; The impact-resistant plate has multiple reinforcing ribs on its side wall.

5. The diesel vehicle fuel tank structure according to claim 1, characterized in that, The protective assembly also includes a fixing post, the first end of which is connected to the top of the impact-resistant plate, and the second end of which is connected to the bottom of the fuel tank body.

6. The diesel vehicle fuel tank structure according to claim 1, characterized in that, The oil tank body is provided with a boss at the position of the oil outlet; The protective assembly also includes a fixing plate and fasteners. The bottom of the seal is inserted into the oil outlet hole. The fixing plate is connected to the top of the seal. The fasteners are arranged circumferentially along the fixing plate and pass through the fixing plate and the seal, and are connected to the boss.

7. The diesel vehicle fuel tank structure according to claim 6, characterized in that, The sealing element includes a connecting part and a protruding part. The protruding part is connected to the connecting part. The connecting part is located between the fixing plate and the boss. The protruding part has a trapezoidal structure and is inserted into the oil outlet hole.

8. The diesel vehicle fuel tank structure according to claim 1, characterized in that, The diesel vehicle fuel tank structure also includes two baffles, which are disposed inside the fuel tank body and divide the fuel tank body into an installation cavity and a partition cavity. The fuel outlet pipe, the filter screen cylinder, and the shock-absorbing plate are all located in the installation cavity, and the fuel return pipe is located in the partition cavity. The baffle has connection ports at both opposite corners.

9. The diesel vehicle fuel tank structure according to claim 8, characterized in that, The diesel vehicle fuel tank structure also includes a fuel level sensor, which is located on the top of the fuel tank body and close to the return fuel pipe. The fuel level sensor passes through the fuel tank body and is inserted into the partition cavity.

10. The diesel vehicle fuel tank structure according to claim 1, characterized in that, The diesel vehicle fuel tank structure also includes a vent valve, which is located on the top of the fuel tank body.

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