An impact-resistant, leak-resistant fuel tank filler cap assembly

Abstract

An anti-impact and anti-leakage fuel tank filler cap sealing assembly includes an inner shell provided with a through gun insertion channel, an end cover including a gun insertion cavity seat connected to the inner shell at a corresponding gun insertion channel entry end and an annular clamping edge integrally provided on the outer periphery of the gun insertion cavity seat, the end cover being provided with a gun insertion cavity opening corresponding to the gun insertion channel, and an outer tube clamping cavity being provided between the annular clamping edge and the inner shell, an outer sealing cover for sealing the gun insertion cavity opening, a broken material protection structure being provided between the gun insertion cavity seat and the annular clamping edge, the broken material protection structure including a set of connecting plates arranged at least partially around the outer periphery of the gun insertion cavity seat and a through slot, the connecting plates and the through slot being circumferentially adjacent to each other, the connecting plates being connected to the gun insertion cavity seat and the annular clamping edge at the two radial ends thereof, respectively, to avoid separation of the end cover from the inner shell and to reduce the risk of oil tank sealing failure in an accident.

Description

Technical Field

[0001] This utility model relates to the field of fuel tank filler port manufacturing technology, specifically to an impact-resistant and leak-proof fuel tank filler port flip-top sealing assembly. Background Technology

[0002] With increasingly stringent automotive safety and environmental standards, capless fuel filler necks have become the mainstream design for modern automotive fuel refueling systems due to their convenience and excellent sealing performance. This technology eliminates the need for a traditional removable fuel tank cap, allowing users to directly insert the fuel nozzle for operation. This reduces the risk of fuel evaporation leakage caused by a loose or missing cap, and complies with stringent volatile organic compound (VOC) emission regulations. The core component of such systems typically includes a flip-top sealing mechanism that automatically opens when the fuel nozzle is inserted and quickly resets to a dynamic seal via a resilient element after removal.

[0003] However, in actual vehicle use, especially under extreme conditions such as collisions, the existing capless fuel filler neck structure still poses significant safety hazards. When a vehicle experiences a frontal or side collision, the vehicle structure may deform and impact the end cap component in the fuel filler neck area. Traditional end caps are typically rigidly connected to the inner shell via an annular flange. Under significant impact loads, this can easily cause the end cap to detach completely from the inner shell, leading to seal failure at the inlet end of the fuel filler neck. If fuel leaks from the damaged filler neck, it can easily ignite and cause secondary disasters such as fires or explosions, seriously threatening occupant safety. Therefore, there is an urgent need for a sealing component structure with impact resistance and leak-proof capabilities to ensure reliable daily sealing while improving the overall passive safety performance of the vehicle. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this utility model provides an impact-resistant leak-proof fuel tank filler port flip-top sealing assembly, which avoids the end cover from separating from the inner shell, thereby reducing the risk of fuel tank seal failure during an accident.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: An impact-resistant, leak-proof fuel tank filler cap sealing assembly includes: The inner shell has a through-hole for inserting the gun; the end cover includes a cavity seat connected to the inner shell corresponding to the inlet end of the insertion channel and an annular retaining edge integrally provided on the outer periphery of the cavity seat, the end cover has an insertion port corresponding to the insertion channel, and an outer tube retaining cavity is provided between the annular retaining edge and the inner shell; an outer sealing cover is used to seal the insertion port; a material breakage protection structure is provided between the cavity seat and the annular retaining edge, the material breakage protection structure includes a set of connecting plates and through slots arranged around at least a portion of the outer periphery of the cavity seat, the connecting plates and through slots are adjacent to each other in the circumferential direction, and the two ends of the connecting plates are respectively connected to the cavity seat and the annular retaining edge in the radial direction.

[0006] Furthermore, in this application, an impact-resistant leak-proof fuel tank filler cap sealing assembly includes a material breakage protection structure located at a portion of the outer periphery of the insert seat. A connecting section is provided between the insert seat and the annular retaining edge. In the installed position, the connecting section is located at the lower end of the outer periphery of the insert seat, and the material breakage protection structure is located circumferentially outside the connecting section. As a preferred embodiment of this application, since the fuel tank needs to be hooked up during refueling, the connecting section located at the lower end of the outer periphery of the insert seat in this application, i.e., the material breakage protection structure does not extend to the lower end of the outer periphery of the insert seat, can improve the stability of the lower load-bearing structure when hooking up the fuel tank.

[0007] Furthermore, in this application, an impact-resistant leak-proof fuel tank filler cap sealing assembly is provided. The annular flange sidewall has several buckles, each buckle having a protruding head extending from the inner sidewall of the annular flange. Each buckle includes a first buckle located radially outside the material breakage protection structure, and each first buckle has at least one connecting plate radially inside. As a preferred embodiment of this application, the buckles are used to fasten the flanged structure at the end of a metal sleeve (not shown) fitted onto the outer side of the inner shell. Therefore, the position of the annular flange corresponding to the buckle will be subjected to external expansion force. If the slot is directly opposite the radially outside of the buckle, the local deformation of the position of the annular flange corresponding to the buckle will be excessive under the external expansion force, resulting in poor structural strength and affecting the tightness of the connection between the buckle and the metal sleeve. In this application, based on the above structure, by setting the connecting plate radially inside the first buckle to hold the annular flange, excessive deformation of the annular flange at the first buckle is prevented.

[0008] Furthermore, in this application, an impact-resistant leak-proof fuel tank filler cap sealing assembly has a circular outer edge contour of the insert seat. In the installed position, the center of the outer edge contour of the insert seat is offset towards the connecting section relative to the center of the annular retaining edge, and the material breakage protection structure is crescent-shaped overall. As a preferred embodiment of this application, the radial width of the connecting section is smaller than the radial width of the material breakage protection structure, which, compared to concentric arrangement, improves the robustness of the connection at the connecting section position.

[0009] Furthermore, in this application, an impact-resistant leak-proof fuel tank filler cap sealing assembly includes a sealing ring positioning platform at one end of the insert seat near the inner shell. An end sealing ring is fitted onto the side wall of the sealing ring positioning platform, and a locking head is located radially outside the end sealing ring. As a preferred embodiment of this application, the end sealing ring seals the gap between a metal sleeve (not shown) fitted onto the outer side of the inner shell and the sealing ring positioning platform, and the locking head engages the flange at the end of the metal sleeve.

[0010] Furthermore, in one impact-resistant leak-proof fuel tank filler cap sealing assembly of this application, the center of the sealing ring positioning platform is offset towards the connecting section relative to the center of the inner wall of the annular retaining flange. As a preferred embodiment of this application, based on the above structure, the radial gap between the metal sleeve fitted on the outer side of the inner shell and the inner wall of the annular retaining flange is larger on the outer side of the material breakage protection structure than on the outer side of the connecting section. Therefore, it can reduce the probability of the annular retaining flange on the outer side of the connecting section receiving impact, making it easier for the annular retaining flange on the outer side of the material breakage protection structure to undergo localized fracture, thus achieving the effect of separation protection.

[0011] Furthermore, in an impact-resistant leak-proof fuel tank filler port flip-top sealing assembly of this application, the material breakage protection structure is disposed on the rear end of the annular retaining edge corresponding to the insertion gun direction.

[0012] Furthermore, in this application, an impact-resistant leak-proof fuel tank filler cap type sealing assembly is provided with a sealing ring limiting edge at one end of the inner shell near the end cover. The sealing ring limiting edge axially abuts against the sealing ring positioning platform, and at least a portion of the outer edge of the sealing ring limiting edge is radially outside the sealing ring positioning platform to axially limit the end sealing ring.

[0013] As can be seen from the above technical solution, this utility model has the following beneficial effects: This utility model provides an impact-resistant, leak-proof, flip-top sealing assembly for a fuel tank filler port. Based on the aforementioned structure, the principle is that a metal sleeve is fitted onto the inner shell, with the end of the sleeve positioned within the outer tube clamp cavity. The end cover corresponds to the outermost side of the filler port. When a vehicle is involved in an impact, the deformation of the vehicle body can easily cause it to abut against the annular clamp edge, leading to the separation of the end cover from the inner shell. This results in seal failure at the inlet end of the filler nozzle, causing fuel leakage and secondary hazards. In this application, a material breakage protection structure is incorporated, ensuring that under such circumstances, the annular clamp edge is prone to localized breakage at the connecting plate location, thus preventing the end cover from completely separating from the inner shell and reducing the risk of fuel tank seal failure during an accident. Furthermore, the connecting plate and the through-groove are circumferentially adjacent to each other to enhance the stability of the annular clamp edge and connecting plate in the event of localized breakage. Attached Figure Description

[0014] Figure 1 This is a plan view of a shock-proof leak-proof fuel tank filler port flip-top sealing assembly facing the nozzle direction, according to an embodiment of this application. Figure 2 for Figure 1 Cross-sectional view along the AA direction (in installation position); Figure 3 for Figure 2 A magnified view of a portion of area A in the center circle; Figure 4 for Figure 2 A schematic diagram of the mid-section cover; Figure 5 for Figure 4 A magnified view of a portion of area B in the center circle; Figure 6 This is a schematic diagram showing the connection between the outer sealing cap and the torsion spring in an embodiment of this application; Figure 7 This is a schematic diagram showing the connection between the inner sealing cap and the torsion spring in an embodiment of this application; Figure 8 This is a schematic diagram illustrating the fit between the torsion spring and the slide groove in an embodiment of this application; Figure 9 for Figure 8 A schematic diagram showing the hidden torsion spring; Figure 10 This is a cross-sectional view of the outer sealing cap in an embodiment of this application; Figure 11 This is a schematic diagram showing the connection between the inner shell and the end cover in an embodiment of this application; Figure 12 This is a schematic diagram of the end cap structure in an embodiment of this application; Figure 13 This is a schematic diagram of the inner shell structure in an embodiment of this application; Figure 14 This is a schematic diagram showing the positional relationship between the first buckle and the connecting plate on the end cover in an embodiment of this application.

[0015] In the picture: 1-Inner shell; 10-Gun insertion channel; 11-Circumferential positioning edge; 12-Annular sealing ring groove; 13-Sealing ring limiting edge; 2-End cover; 20-Insertion cavity; 201-Annular sealing surface; 202-Gun hanging limiting edge; 203-Sloping surface; 21-Outer end plane; 22-Positioning piece; 23-Insertion cavity seat; 231-Sealing ring positioning platform; 24-Annular retaining edge; 240-Outer tube retaining cavity; 241-First buckle; 242-Clamping head; 25-Material breakage protection structure; 251-Connecting plate; 252-Through groove; 26-Connecting section; 3-Outer sealing cap; 31-Annular sealing lip; 311-Annular main protrusion; 4-Torsion spring; 40-Slide groove; 401-Raised ridge; 41-First presser foot; 42-Second presser foot; 5-Inner sealing cap. Detailed Implementation

[0016] Combination Figures 1 to 3 The disclosed shock-proof leak-proof fuel tank filler cap sealing assembly includes: The inner shell 1 has a through gun insertion channel 10; End cover 2, the end cover 2 includes a cavity seat 23 connected to the inner shell 1 corresponding to the entry end of the gun insertion channel 10 and an annular retaining edge 24 integrally provided on the outer periphery of the cavity seat 23. The end cover 2 is provided with a cavity opening 20 corresponding to the gun insertion channel 10, and an outer tube retaining cavity 240 is provided between the annular retaining edge 24 and the inner shell 1. The outer sealing cap 3 is used to seal the cavity opening 20; A material breakage protection structure 25 is provided between the cavity seat 23 and the annular retaining edge 24. The material breakage protection structure 25 includes a set of connecting plates 251 and through slots 252 arranged around at least part of the outer periphery of the cavity seat 23. The connecting plates 251 and through slots 252 are adjacent to each other in the circumferential direction. The two ends of the connecting plates 251 are respectively connected to the cavity seat 23 and the annular retaining edge 24 in the radial direction.

[0017] Based on the above structure, a metal sleeve (not shown) is fitted onto the inner shell 1, with the end of the metal sleeve positioned in the outer tube clamp cavity 240. The end cover 2 corresponds to the outermost side of the fuel filler neck. When a vehicle is involved in an impact, the deformation of the vehicle body can easily cause it to come into contact with the annular clamp edge 24, leading to the separation of the end cover 2 from the inner shell 1. This results in the failure of the seal at the inlet end of the fuel filler neck channel 10, causing fuel leakage and creating a secondary hazard. In this application, by setting a material breakage protection structure 25, the annular clamp edge 24 is prone to local breakage at the location of the connecting plate 251 under the above circumstances, thus preventing the end cover 2 from separating entirely from the inner shell 1 and reducing the risk of fuel tank seal failure during an accident. The connecting plate 251 and the through groove 252 are circumferentially adjacent to each other to improve the stability of the annular clamp edge 24 and the connecting plate 251 in the event of local breakage.

[0018] Furthermore, in this embodiment, the material breakage protection structure 25 is located at a portion of the outer periphery of the insert seat 23. A connecting section 26 is provided between the insert seat 23 and the annular retaining edge 24. In the installed position, the connecting section 26 is located at the lower end of the outer periphery of the insert seat 23, and the material breakage protection structure 25 is located circumferentially outside the connecting section 26. Since the fuel tank needs to be hooked up during refueling, in this application, the connecting section 26 is located at the lower end of the outer periphery of the insert seat 23, meaning the material breakage protection structure 25 does not extend to the lower end of the outer periphery of the insert seat 23, which improves the stability of the lower load-bearing structure when hooking up the fuel tank.

[0019] Furthermore, in combination Figure 14As shown, in this embodiment, the annular retaining edge 24 has several buckles on its sidewall. Each buckle has a buckle head 242 protruding from the inner sidewall of the annular retaining edge 24. Each buckle includes a first buckle 241 located radially outside the material breakage protection structure 25. Each first buckle 241 has at least one connecting plate 251 located radially inside. The buckles are used to fasten the flange structure at the end of the metal sleeve (not shown) sleeved on the outside of the inner shell 1. Therefore, the position of the annular retaining edge 24 corresponding to the buckle will be subjected to external expansion force. If the position of the through groove 252 is directly opposite the radial outside of the buckle, it will cause excessive local deformation of the position of the annular retaining edge 24 corresponding to the buckle under the external expansion force, resulting in poor structural strength and affecting the tightness of the connection between the buckle and the metal sleeve. In this application, based on the above structure, by setting the connecting plate 251 radially inside the first buckle 241 to pull the annular retaining edge 24, excessive deformation of the annular retaining edge 24 at the first buckle 241 is prevented.

[0020] In this embodiment, the outer edge of the insertion cavity seat 23 is circular. In the installed position, the center of the outer edge of the insertion cavity seat 23 is offset towards the connecting section 26 relative to the center of the annular retaining edge 24. The material breakage protection structure 25 is crescent-shaped. This makes the radial width of the connecting section 26 smaller than the radial width of the material breakage protection structure 25. Compared with concentric arrangement, this improves the firmness of the connection at the position of the connecting section 26.

[0021] Furthermore, in combination Figure 4 As shown, in this embodiment, the insertion cavity seat 23 is provided with a sealing ring positioning platform 231 near the inner shell 1. An end sealing ring (not shown) is sleeved on the side wall of the sealing ring positioning platform 231, and the clamping head 242 is located radially outside the end sealing ring. The end sealing ring is used to seal the gap between the metal sleeve (not shown) sleeved on the outside of the inner shell 1 and the sealing ring positioning platform 231. The clamping head 242 is used to clamp the flange at the end of the metal sleeve.

[0022] Furthermore, in this embodiment, the center of the sealing ring positioning platform 231 is offset towards the connecting section 26 relative to the center of the inner wall of the annular retaining edge 24. Based on the above structure, the radial gap between the metal sleeve fitted on the outer side of the inner shell 1 and the inner wall of the annular retaining edge 24 is larger on the outer side of the material breakage protection structure 25 than on the outer side of the connecting section 26. Therefore, the probability of the annular retaining edge 24 on the outer side of the connecting section 26 being impacted can be reduced, making the annular retaining edge 24 on the outer side of the material breakage protection structure 25 more prone to local fracture, thus achieving the effect of separation protection. Specifically, the center of the sealing ring positioning platform 231 coincides with the center of the outer contour of the insertion cavity seat 23.

[0023] In this embodiment, the material breakage protection structure 25 is disposed on the rear end of the annular retaining edge 24 corresponding to the insertion gun direction.

[0024] In this embodiment, the combination is further made Figure 2 and Figure 13 As shown, the inner shell 1 has a sealing ring limiting edge 13 at one end near the end cover 2. The sealing ring limiting edge 13 abuts axially with the sealing ring positioning platform 231. At least a portion of the outer edge of the sealing ring limiting edge 13 is radially outside the sealing ring positioning platform 231 to axially limit the end sealing ring.

[0025] Furthermore, in combination Figures 11 to 13 As shown, in this embodiment, a positioning piece 22 extends from one end of the end cover 2 near the inner shell 1. The positioning piece 22 is located radially outside the insertion cavity 20 and fits against the inner wall of the inner shell 1. A pair of circumferential positioning edges 11 are provided on the side of the inner wall of the inner shell 1. The positioning piece 22 is circumferentially limited between the pair of circumferential positioning edges 11. The positioning piece 22 is connected to the inner wall of the inner shell 1 by laser welding. Based on the above structure, the positioning piece 22 is used to achieve positioning and welding connection between the inner shell 1 and the end cover 2. On the one hand, it is convenient to ensure the relative position between the inner shell 1 and the end cover 2 during assembly. On the other hand, the fixed connection by laser welding can ensure the connection strength and has the advantage of simple structure.

[0026] Example 2 Based on Example 1, further, combined with Figures 1 to 5 As shown in this embodiment, an impact-resistant leak-proof fuel tank filler port flip-top sealing assembly has one end of the outer sealing cover 3 rotatably mounted on the inner shell 1. The outer sealing cover 3 is provided with an annular sealing lip 31, and the outer edge of the end cover 2 corresponding to the insertion port 20 near the insertion gun channel 10 is provided with an annular sealing surface 201. It also includes an elastic part, which is elastically connected to the outer sealing cover 3 so that the annular sealing lip 31 and the annular sealing surface 201 elastically abut and seal, at which time the cavity opening 20 is in a sealed state. The annular sealing lip 31 has an annular main protrusion 311 on the side near the annular sealing surface 201. The annular sealing surface 201 has a gun-hanging limiting edge 202. In the installation posture, the gun-hanging limiting edge 202 is located at the lower end of the insertion cavity 20. When the insertion cavity 20 is in a sealed state, the gun-hanging limiting edge 202 is located on the radial inner side of the annular main protrusion 311.

[0027] Based on the above structure, the principle of the anti-impact leakage type flip-top sealing assembly for fuel tank filling ports in this embodiment is as follows: During use, the fuel nozzle is inserted into the insertion port 20, and the outer sealing cover 3 is pushed inward to enter the nozzle insertion channel 10; during refueling, the fuel nozzle is hung on the nozzle hanging limit edge 202 by the nozzle hanging step, which can prevent the fuel nozzle from sliding outward; after refueling is completed, the fuel nozzle is lifted until the nozzle hanging step is disengaged from the nozzle hanging limit edge 202, and the fuel nozzle is pulled out. The outer sealing cover 3 automatically returns to the insertion port 20 in a sealed state through the elastic part. In this application, by setting the nozzle hanging limit edge 202 radially inward on the annular sealing surface 201 corresponding to the annular main protrusion 311, the problem of decreased sealing performance caused by wear between the sealing position of the annular sealing surface 201 and the annular sealing lip 31 due to the nozzle hanging operation can be effectively avoided. Furthermore, in this embodiment, the annular sealing lip 31 is made of soft rubber material formed by secondary injection molding. The outer end of the end cover 2 is provided with an outer end plane 21.

[0028] Furthermore, in this embodiment, in the gun insertion direction, the gun-mounting limiting edge 202 protrudes from the annular sealing surface 201 on one side of the lower end and abuts against the annular main protrusion 311. This effectively avoids the risk of seal failure on the corresponding side due to wear of the gun-mounting limiting edge 202 caused by gun-mounting operations.

[0029] Furthermore, in this embodiment, the annular sealing surface 201 is a plane. In the installation posture, the annular sealing surface 201 is inclined relative to the reference vertical plane towards the gun insertion direction. Therefore, in the gun insertion direction, the upper side of the annular sealing surface 201 is always located behind the lower side, that is, the upper side always protrudes from the lower side. The gun-holding limiting edge 202 is the lower end of the inner edge of the annular sealing surface 201, wherein the reference vertical plane is a vertical plane perpendicular to the gun insertion direction. The annular sealing surface 201 is a plane, which can ensure the uniformity of circumferential sealing. Compared with the conventional gun-holding limiting edge 202 that protrudes entirely from the annular sealing surface 201 in other embodiments, in this embodiment, the gun-holding limiting edge 202 only corresponds to the inner edge of the annular sealing surface 201, thereby avoiding the impact on sealing reliability due to the protruding gun-holding limiting edge 202 abutting against the annular main protrusion 311.

[0030] Combination Figure 5 As shown, further, in this embodiment, the angle α between the annular sealing surface 201 and the reference vertical plane ranges from 1° to 3°. Specifically, further, in this embodiment, the angle α is 2°.

[0031] Combination Figure 2As shown, further, in this embodiment, an annular sealing groove 12 is provided on the outer side of the inner shell 1, and the insertion direction corresponds to the extension direction of the axis of the annular sealing groove 12. It should be noted that, in order to locate the reference vertical plane, the insertion direction in this application is not the actual insertion trajectory, but corresponds to the axis of the annular sealing groove 12, i.e., the virtual center line passing through the center of the circle. This allows the orientation of the reference vertical plane to be determined, and further determines the inclination orientation of the annular sealing surface 201 relative to the reference vertical plane, i.e., the included angle α. Specifically, the annular sealing groove 12 is used to set a sealing ring to seal the radial gap between the inner shell 1 and the metal sleeve (not shown) sleeved outside the inner shell 1.

[0032] Furthermore, in this embodiment, the sidewall of the insertion port 20 near the nozzle mounting edge 202 is provided with a ramp surface 203 extending from the outside to the inside in the nozzle insertion direction. In the installation posture, the lower edge of the outer end of the ramp surface 203 is lower than the nozzle mounting edge 202. Based on the above structure, when the refueling nozzle is mounted on the nozzle mounting edge 202, the ramp surface 203 can provide effective limiting and avoidance for the refueling nozzle.

[0033] Furthermore, in this embodiment, the outer sealing cap 3 is rotatably connected to the inner shell 1 at the position opposite to the nozzle insertion channel 10 and the nozzle mounting edge 202. When the nozzle is mounted, due to the action of the elastic part, the outer sealing cap 3 can apply a force to press the refueling nozzle against the nozzle mounting edge 202, thereby ensuring that the refueling nozzle is stably suspended and not easily falls off.

[0034] Combination Figure 3 As shown, in this embodiment, the annular main protrusion 311 is located at the outer edge of the annular sealing lip 31.

[0035] Combination Figure 7 As shown, in this embodiment, an inner sealing cover 5 is further included, one end of which is rotatably mounted on the inner shell 1. The inner sealing cover 5 is used to seal the outlet end. Combination Figures 6 to 10 As shown, the inner shell 1 is provided with an elastic part including a pair of torsion springs 4 that elastically abut against the outer sealing cover 3 and the inner sealing cover 5 respectively. The torsion springs 4 are provided with a first pressure foot 41 and a second pressure foot 42. The first pressure foot 41 abuts against the inner shell 1. The second pressure feet 42 of the pair of torsion springs 4 abut against the outer sealing cover 3 and the inner sealing cover 5 respectively. The end faces of the outer sealing cover 3 and the inner sealing cover 5 near the second pressure foot 42 are provided with a groove 40 for receiving the second pressure foot 42. At least one groove 40 has a protrusion 401 at the bottom that abuts against the second pressure foot 42.

[0036] The first pressure foot 41 abuts against the inner shell 1 to circumferentially limit the torsion spring 4. The second pressure foot 42 is used to transmit the elastic force of the torsion spring 4 to the outer sealing cover 3 and the inner sealing cover 5. The slide groove 40 is used to limit the second pressure foot 42. During the rotation of the outer sealing cover 3 and the inner sealing cover 5, the second pressure foot 42 will slide in the slide groove 40. By setting a protrusion 401 at the bottom of the slide groove 40, the friction between the second pressure foot 42 and the slide groove 40 is reduced, thereby improving the stability of the elastic force transmission.

[0037] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on the explanation herein, those skilled in the art can conceive of other specific embodiments of this utility model without creative effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A shock-proof, leak-proof fuel tank filler cap sealing assembly, comprising: The inner shell (1) has a through gun insertion channel (10). End cover (2), the end cover (2) includes a cavity seat (23) connected to the inner shell (1) corresponding to the entry end of the insertion channel (10) and an annular retaining edge (24) integrally provided on the outer periphery of the cavity seat (23). The end cover (2) is provided with a cavity opening (20) corresponding to the insertion channel (10). An outer tube retaining cavity (240) is provided between the annular retaining edge (24) and the inner shell (1). Outer sealing cap (3), which is used to seal the cavity opening (20); Its features are: A material breakage protection structure (25) is provided between the cavity seat (23) and the annular retaining edge (24). The material breakage protection structure (25) includes a set of connecting plates (251) and through slots (252) arranged around at least part of the outer periphery of the cavity seat (23). The connecting plates (251) and through slots (252) are adjacent to each other in the circumferential direction. The two ends of the connecting plates (251) are connected to the cavity seat (23) and the annular retaining edge (24) respectively in the radial direction.

2. The anti-impact leakage type flip-top sealing assembly for fuel tank filling port according to claim 1, characterized in that: The material breakage protection structure (25) is located at a part of the outer periphery of the insert seat (23). A connecting section (26) is provided between the insert seat (23) and the annular retaining edge (24). In the installation posture, the connecting section (26) is located at the lower end of the outer periphery of the insert seat (23), and the material breakage protection structure (25) is located on the circumferential outer side of the connecting section (26).

3. The anti-impact leakage type flip-top sealing assembly for fuel tank filling port according to claim 1, characterized in that: The annular rim (24) has several buckles on its sidewall, and each buckle has a buckle head (242) protruding from the inner sidewall of the annular rim (24). Each buckle includes a first buckle (241) located radially outside the material breakage protection structure (25), and each first buckle (241) has at least one connecting plate (251) on its radially inner side.

4. The anti-impact leakage type flip-top sealing assembly for a fuel tank filler neck according to claim 2, characterized in that: The outer edge of the insert seat (23) is circular. In the installation position, the center of the outer edge of the insert seat (23) is offset towards the connecting section (26) relative to the center of the annular retaining edge (24). The material breakage protection structure (25) is crescent-shaped as a whole.

5. The anti-impact leakage type flip-top sealing assembly for a fuel tank filler neck according to claim 1, characterized in that: The annular rim (24) has several buckles on its sidewall, and each buckle has a buckle head (242) protruding from the inner sidewall of the annular rim (24). The cavity seat (23) has a sealing ring positioning platform (231) at one end near the inner shell (1). The sealing ring positioning platform (231) has an end sealing ring sleeved on its sidewall, and the buckle head (242) is located radially outside the end sealing ring.

6. The anti-impact leakage type flip-top sealing assembly for a fuel tank filler neck according to claim 5, characterized in that: The material breakage protection structure (25) is located at a part of the outer periphery of the insert seat (23). A connecting section (26) is provided between the insert seat (23) and the annular retaining edge (24). In the installation posture, the connecting section (26) is located at the lower end of the outer periphery of the insert seat (23), and the material breakage protection structure (25) is located on the circumferential outer side of the connecting section (26). The center of the sealing ring positioning platform (231) is offset towards the connecting section (26) relative to the center of the inner wall of the annular retaining edge (24).

7. The anti-impact leakage type flip-top sealing assembly for a fuel tank filler neck according to claim 1, characterized in that: The material breakage protection structure (25) is located on the annular retaining edge (24) at the rear end corresponding to the insertion direction of the gun.

8. The anti-impact leakage type flip-top sealing assembly for a fuel tank filler neck according to claim 5, characterized in that: The inner shell (1) has a sealing ring limiting edge (13) at one end of the near end cover (2). The sealing ring limiting edge (13) abuts axially with the sealing ring positioning platform (231). At least part of the outer edge of the sealing ring limiting edge (13) is radially outside the sealing ring positioning platform (231).

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