A dustproof sealing device for an automobile fuel tank cap

Abstract

The utility model discloses a dustproof sealing device of automobile oil tank cover relates to oil tank cover technical field, including base, base fixed mounting is in the car body oil tank mouth position, and one side of base rotatory mounting has the outer cover, and the inner side of outer cover is provided with sealing structure. The utility model discloses the mechanical structure design of inflating and pressure -relief linkage trigger opening and closing action of outer cover, realizes multiple remarkable beneficial effects: on one hand, with the fixed block of outer cover closing push slider, drive piston block to the dynamic process of the inflation of sealing air bag ring, make air bag ring in the saturated state self -adaptation fill the gap of outer cover edge and base, eliminate the sealing blind area of traditional sealing strip easy to miss, form the double protection of gas pressure support and physical adhesion, effectively block dust, mud invasion, on the other hand, the whole inflation, pressure -relief process is completely relied on the opening and closing self -determination of outer cover and completes, need not user additional operation.

Description

Technical Field

[0001] This utility model relates to the field of fuel tank cap technology, specifically a dustproof sealing device for an automobile fuel tank cap. Background Technology

[0002] As a key component in contact with the external environment, the fuel tank cap's core function is to protect the fuel tank opening from environmental influences and ensure the safety and sealing of fuel storage. As one of the most easily worn and frequently operated parts of a vehicle, the dustproof and sealing effect of the fuel tank cap is directly related to the cleanliness of the fuel system. If not properly protected, impurities entering the fuel tank may cause fuel filter blockage, fuel injector malfunction, and even affect engine power output and service life.

[0003] Fuel tank caps typically consist of an inner cap that blocks the filler neck and an outer cap that is integrated with the vehicle body. The outer cap is usually connected to the vehicle body via a hinge, allowing it to rotate around the hinge to open and close. When closed, it is secured by a buckle or electronic locking mechanism to ensure it does not loosen during driving. In terms of sealing, some models have an annular groove on the inner edge of the outer cap, into which a rubber sealing strip is embedded. When the outer cap is closed, the sealing strip fits tightly against the perimeter of the fuel tank opening on the side of the vehicle body, forming a physical barrier. Some models omit the sealing structure of the outer cap and instead have a drainage hole below the fuel tank opening, which guides accumulated water to the bottom of the vehicle through a conduit. Some users choose to purchase their own sealing strips for dust and water protection.

[0004] However, the reduced sealing structure of the fuel tank cover will create a large gap between the vehicle body and the cover, allowing dust and mud to easily seep in, significantly reducing the protective effect. Rubber sealing strips have inherent material limitations; when exposed to sunlight, ultraviolet rays, alternating high and low temperatures, and corrosive environments from vehicle exhaust, they are prone to aging, hardening, and cracking. They will lose their elasticity after 1-2 years of use. User-applied sealing strips may not be properly adhered or may have adhesive residue. These problems will ultimately lead to rainwater carrying dust and mud into the fuel tank opening area, where a large amount of impurities accumulate near the drainage holes, gradually clogging the drainage hole channels and causing water accumulation. Therefore, a dustproof sealing device for automotive fuel tank caps is proposed. Utility Model Content

[0005] Therefore, the purpose of this utility model is to provide a dustproof sealing device for an automobile fuel tank cap, so as to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a dustproof sealing device for an automobile fuel tank cap, comprising a base, the base being fixedly installed at the fuel tank opening position of the vehicle body, and an outer cover plate being rotatably installed on one side of the base, a sealing structure being provided on the inner side of the outer cover plate, and a fixing block cooperating with the sealing structure being fixedly installed inside the base for triggering the sealing structure.

[0007] The sealing structure includes a sealing airbag ring, a slider, and a piston structure. The sealing airbag ring is fixedly installed on the inner edge of the outer cover plate, and an inflation tube is fixedly installed on the outer wall of the sealing airbag ring. One end of the inflation tube is fixedly connected to the end of the piston structure, and the other end of the piston structure is connected to the end of the slider. The slider works in cooperation with the fixed block. When the outer cover plate is closed, the fixed block pushes the slider to cause the piston structure to inflate the sealing airbag ring through the inflation tube.

[0008] By adopting the above technical solution, the piston mechanism is triggered by the slider, which inflates the sealing airbag ring through the inflation pipe. When the airbag ring is saturated, it adaptively fills the gap between the edge of the outer cover plate and the base, thereby eliminating the sealing blind spots that are easily missed by traditional sealing strips. This forms a dual protection of gas pressure support and physical adhesion, effectively preventing dust and mud from entering.

[0009] Furthermore, the piston mechanism includes a cylinder, a connecting rod, and a piston block, wherein the cylinder is fixedly installed on the inner side of the outer cover plate, and the piston block is slidably installed on the inner wall of the cylinder, and the outer wall of the piston block and the inner wall of the cylinder are tightly fitted together. One end of the connecting rod is fixedly installed on the end of the piston block, and the other end is fixedly installed on the end of the slider.

[0010] By adopting the above technical solution, the rigid connection ensures that the power transmission is lag-free, and the linear motion of the slider can be accurately converted into the axial motion of the piston block, thereby achieving efficient force transmission.

[0011] Furthermore, the inner side of the outer cover plate is provided with a sliding groove corresponding to the slider, and the length of the sliding groove corresponds to the sliding length of the piston block.

[0012] By adopting the above technical solution and through precise size matching, the effective stroke of the piston block in the cylinder is ensured, which not only ensures sufficient inflation of the sealing airbag ring, but also prevents excessive sliding of the piston block from causing damage to the components, thus achieving precise control of the motion stroke.

[0013] Furthermore, the side of the block facing the fixing block is designed with an inclined surface, and the corners of the fixing block are designed with an arc shape.

[0014] By adopting the above technical solution, the inclined structure can convert the vertical pressure when the outer cover plate is closed into the horizontal component force that pushes the slider to slide, thereby improving the force transmission efficiency and reducing energy loss.

[0015] Furthermore, the sealing airbag ring has an annular structure and is nested in the groove on the inner edge of the outer cover plate.

[0016] By adopting the above technical solution, the groove provides a stable installation position for the airbag ring, preventing it from shifting or falling off during opening and closing. At the same time, the depth of the groove matches the thickness of the airbag ring in its uninflated state, thereby avoiding the scraping problem caused by the airbag ring protruding when it is uninflated, and ensuring the stability of the structure during operation.

[0017] In summary, the present invention has the following main advantages:

[0018] This utility model achieves multiple significant benefits through a mechanical structure design that triggers inflation and depressurization via the opening and closing of the outer cover plate. Firstly, by utilizing the dynamic process of the fixed block pushing the slider and driving the piston block to inflate the sealing airbag ring when the outer cover plate is closed, the airbag ring adaptively fills the gap between the edge of the outer cover plate and the base in a saturated state, eliminating the sealing blind spots easily missed by traditional sealing strips. This forms a dual protection of gas pressure support and physical adhesion, effectively preventing dust and mud from intruding. Even with slight elasticity loss in the airbag ring, it can still maintain a stable seal through inflation, significantly improving dustproof and waterproof reliability and service life. Secondly, the entire inflation... The airbag deflation process is entirely automated by the opening and closing of the outer cover, requiring no additional user intervention. The force transmission design from the rounded corners to the bevel ensures smooth opening and closing without any jamming or obstruction, conforming to user operating habits and improving ease of use and feel. In addition, the airbag ring can adapt to different gap sizes through inflation, making it compatible with multiple vehicle models and operating conditions. When opened, it automatically deflates to a semi-contracted state, preventing component abrasion and leaving room for secondary inflation. Combined with the optimized force transmission path and pressure balance mechanical design, it reduces component wear and the risk of failure. It can adapt to harsh environments without relying on electronic components, significantly enhancing structural adaptability, durability, and operational stability. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the entire utility model;

[0020] Figure 2 This is an exploded view of the sealing structure of this utility model;

[0021] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0022] In the diagram: 1. Base; 11. Fixing block; 2. Outer cover plate; 21. Slide groove; 3. Sealing airbag ring; 31. Inflation pipe; 32. Cylinder; 33. Connecting rod; 34. Sliding block; 35. Piston block. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0024] The embodiments of this utility model will be described below based on its overall structure.

[0025] Example 1

[0026] A dustproof sealing device for a car fuel tank cap, such as Figure 1-3 As shown, it includes a base 1, which is fixedly installed at the fuel tank opening of the vehicle body. An outer cover plate 2 is rotatably installed on one side of the base 1. A sealing structure is provided on the inner side of the outer cover plate 2. A fixing block 11 that cooperates with the sealing structure is fixedly installed inside the base 1 to trigger the sealing structure. The mechanical structure design of triggering inflation and depressurization through the opening and closing action of the outer cover plate 2 achieves multiple significant beneficial effects.

[0027] The sealing structure includes a sealing airbag ring 3, a slider 34, and a piston structure. Each component has a clear function and works collaboratively to form a complete sealing linkage system. The sealing airbag ring 3 is fixedly installed on the inner edge of the outer cover plate 2, forming a ring-shaped protection around the edge of the outer cover plate 2 to ensure complete coverage of the gap. An inflation tube 31 is fixedly installed on the outer wall of the sealing airbag ring 3. One end of the inflation tube 31 is fixedly connected to the end of the piston structure, establishing a gas transmission pathway. The other end of the piston mechanism is connected to the end of the slider 34. The slider 34 triggers the operation of the piston mechanism, causing it to... The inflation tube 31 inflates the sealing airbag ring 3. When saturated, the sealing airbag ring 3 adaptively fills the gap between the edge of the outer cover plate 2 and the base 1, thereby eliminating the sealing blind spots that are easily missed by traditional sealing strips. This forms a dual protection of gas pressure support and physical adhesion, effectively preventing dust and mud from entering. The slider 34 works in conjunction with the fixing block 11. When the outer cover plate 2 is closed, the fixing block 11 pushes the slider 34 so that the piston mechanism inflates the sealing airbag ring 3 through the inflation tube 31. The sealing is driven by the closing action of the outer cover plate 2 itself, without the need for an additional power source, which improves the practicality and economy of the structure.

[0028] Please see Figure 1-3The piston mechanism includes a cylinder 32, a connecting rod 33, and a piston block 35. The cylinder 32 is fixedly installed inside the outer cover plate 2, and the piston block 35 is slidably installed on the inner wall of the cylinder 32. The sliding fit realizes the basic functions of gas compression and transportation. The outer wall of the piston block 35 and the inner wall of the cylinder 32 are tightly fitted. The high-precision fit ensures no gas leakage and improves the inflation efficiency. One end of the connecting rod 33 is fixedly installed at the end of the piston block 35, and the other end is fixedly installed at the end of the slider 34. The rigid connection ensures that the power transmission is lag-free, so that the linear motion of the slider 34 can be accurately converted into the axial motion of the piston block 35, thereby realizing the efficient transmission of force.

[0029] Please see Figure 1-3 The inner side of the outer cover plate 2 is provided with a groove 21 corresponding to the slider 34. The shape of the groove 21 is adapted to the slider 34, providing a stable movement trajectory for the slider 34 and avoiding transmission failure caused by slider 34 deviation. The length of the groove 21 corresponds to the sliding length of the piston block 35. Through precise size matching, the effective stroke of the piston block 35 in the cylinder 32 is ensured, which not only ensures sufficient inflation of the sealing airbag ring 3, but also prevents the piston block 35 from excessively sliding and causing damage to the components, thus achieving precise control of the movement stroke.

[0030] Please see Figure 1-3 The slider 34 is designed with an inclined surface on the side facing the fixed block 11. The inclined surface structure can convert the vertical pressure when the outer cover plate 2 is closed into the horizontal component force that pushes the slider 34 to slide, thereby improving the force transmission efficiency and reducing energy loss. In addition, the corners of the fixed block 11 are designed with arcs. The arcs can reduce the frictional resistance when in contact with the inclined surface of the slider 34, avoid the wear of parts caused by rigid collisions, and make the contact process between the two smoother, ensuring the stability of the slider 34 sliding and improving the service life and smooth operation of the overall mechanism.

[0031] Please see Figure 1-3 The sealing airbag ring 3 has a ring structure. The ring layout can surround the gap between the outer cover plate 2 and the base 1 in all directions, thereby achieving a seal without dead angles and ensuring the integrity of dustproof and waterproof. It is nested in the groove on the inner edge of the outer cover plate 2. The groove provides a stable installation position for the sealing airbag ring 3, preventing it from shifting or falling off during opening and closing. At the same time, the depth of the groove matches the thickness of the sealing airbag ring 3 in the uninflated state, thereby avoiding the problem of scratching caused by the sealing airbag ring 3 protruding when it is not inflated, and ensuring the stability of the structure operation.

[0032] The working principle of this utility model is as follows: When the user manually presses the outer cover plate 2 to close it, the sealing structure achieves linkage inflation. When the outer cover plate 2 rotates around the hinge to form a small angle with the base 1, the arc corner of the fixing block 11 first contacts the inclined surface of the slider 34. Through the contact method from the corner to the inclined surface, the pressing force of the outer cover plate 2 is converted into a horizontal component force pushing the slider 34. As the user continues to apply pressure in the closing direction, the slider 34 overcomes the friction of the slide groove 21 under the action of the horizontal component force and slowly slides along the slide groove 21 towards the cylinder 32. During the sliding process of the slider 34, the piston block 35 is synchronously pulled by the rigidly connected connecting rod 33, so that the piston block 35 moves along the cylinder. The inner wall of cylinder 32 moves at a constant speed towards the inflation tube 31. When the piston block 35 is pushed forward, it will squeeze the sealed space inside cylinder 32, and force the internal air into the sealing airbag ring 3 in one direction through the inflation tube 31. The sealing airbag ring 3 gradually expands with the gas injection, changing from the initial flat state to the annular convex state. When the outer cover plate 2 is completely attached to the base 1 and locked, the slider 34 is located at the upper end of the slide groove 21 and is in a position that is offset from the fixed block 11. The sealing airbag ring 3 is located in the gap between the edge of the outer cover plate 2 and the base 1 and is in a saturated inflation state. It can adapt to the size of the gap and achieve the function of sealing and dustproofing the cavity formed in the middle of the base 1 and the outer cover plate 2.

[0033] When the user unlocks and lifts the outer cover 2, the slider 34 loses the pressure of the fixing block 11 and slides down a certain distance along the slide groove 21. The sliding down of the slider 34 drives the piston block 35 to move down synchronously through the connecting rod 33, breaking the pressure balance in the cylinder 32. Due to the pressure difference, the saturated gas in the sealing airbag ring 3 flows back into the cylinder 32 through the inflation pipe 31. The gas thrust and the pulling force applied by the slider 34 through the connecting rod 33 work together to push the piston block 35 to move down at a constant speed along the inner wall of the cylinder 32. At this time, the sealing airbag ring 3 gradually contracts due to the gas leakage, changing from a saturated expansion state to an unsaturated semi-contracted state, reserving space for rapid inflation when it is closed next time.

[0034] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A dustproof sealing device for an automobile fuel tank cap, comprising a base (1), characterized in that: The base (1) is fixedly installed at the fuel tank opening of the vehicle body, and an outer cover plate (2) is rotatably installed on one side of the base (1). A sealing structure is provided on the inner side of the outer cover plate (2), and a fixing block (11) that cooperates with the sealing structure is fixedly installed inside the base (1) to trigger the sealing structure. The sealing structure includes a sealing airbag ring (3), a slider (34), and a piston structure. The sealing airbag ring (3) is fixedly installed on the inner edge of the outer cover plate (2), and an inflation tube (31) is fixedly installed on the outer wall of the sealing airbag ring (3). One end of the inflation tube (31) is fixedly connected to the end of the piston structure, and the other end of the piston mechanism is connected to the end of the slider (34). The slider (34) works in cooperation with the fixing block (11). When the outer cover plate (2) is closed, the fixing block (11) pushes the slider (34) to make the piston mechanism inflate the sealing airbag ring (3) through the inflation tube (31).

2. The dustproof sealing device for a car fuel tank cap according to claim 1, characterized in that: The piston mechanism includes a cylinder (32), a connecting rod (33), and a piston block (35). The cylinder (32) is fixedly installed on the inner side of the outer cover plate (2), and the piston block (35) is slidably installed on the inner wall of the cylinder (32). The outer wall of the piston block (35) and the inner wall of the cylinder (32) are tightly fitted together. One end of the connecting rod (33) is fixedly installed on the end of the piston block (35), and the other end is fixedly installed on the end of the slider (34).

3. The dustproof sealing device for a car fuel tank cap according to claim 1, characterized in that: The inner side of the outer cover plate (2) is provided with a groove (21) corresponding to the slider (34), and the length of the groove (21) corresponds to the sliding length of the piston block (35).

4. The dustproof sealing device for a car fuel tank cap according to claim 1, characterized in that: The slider (34) is designed with an inclined surface on the side facing the fixed block (11), and the corners of the fixed block (11) are designed with arcs.

5. The dustproof sealing device for a car fuel tank cap according to claim 1, characterized in that: The sealing airbag ring (3) has an annular structure and is nested in the groove on the inner edge of the outer cover plate (2).

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