A coverless fuel filler cap

Abstract

A new type of coverless fuel filler cap includes a coverless fuel filler cap body, the coverless fuel filler cap body is assembled in an integrally formed fuel filler pipe; the coverless fuel filler cap body includes a shell, the interior of the shell is divided into a guide part and a guide part from top to bottom, the guide part is used to guide the fuel gun to be inserted into the shell, and the guide part is used to guide the oil into the integral oil pipe head; the top of the shell is set as an opening, the shell is equipped with an upper cover at the opening position, and the upper cover is provided with a fuel gun socket; the shell is provided with an upper shell at the upper end of the guide part, and the upper cover is connected to the upper shell by a buckle. The new type of coverless fuel filler cap described in the present invention has a reasonable structural design, the coverless fuel filler cap body is assembled in an integrally formed fuel filler pipe, the upper door, the lower door and the shell are all connected by buckles, the cost is lower, and it also has a separation protection function, and it still remains sealed after a collision, thereby improving safety.

Description

Technical Field

[0001] The invention relates to the technical field of fuel filler caps, and in particular to a novel fuel filler cap without a cover. Background Art

[0002] With the continuous progress of human society, more and more cars have entered people's lives. China has become the world's largest automobile producer and the largest automobile consumer. With the continuous increase in the number of cars, the frequency of traffic accidents is also increasing, and driving safety has attracted more and more attention. The fuel filler cap refers to the cap used to seal the fuel pipe of the automobile tank. When refueling, open the fuel filler cap and insert the fuel gun into the fuel pipe. Therefore, as an indispensable component of the automobile fuel system, the fuel filler cap is constantly challenged by major OEMs and many consumers in terms of its reliability and safety.

[0003] At present, there are many problems with the coverless fuel filler caps on the market: (1) The structure is too complicated and lacks a separation protection design during the collision process. When the car is hit violently, it is easy to break, which makes it difficult to seal the fuel pipe and leak fuel, posing a huge safety risk; (2) The upper and lower flaps of the cover and the shell are usually connected by welding. Due to the unstable welding process, it often leads to problems such as welding penetration, cold welding and leaking welding; (3) The built-in valve in the small door is assembled by assembly process. Due to the large assembly tolerance, it is easy to cause the sealing gasket in the valve to get stuck, thereby affecting the sealing performance of the valve; the outer diameter of the coverless fuel filler cap is too large, resulting in the inability to directly expand the oil pipe head matched with it on the main pipe. It needs to adopt a two-stage welding process to fix it on the fuel pipe. Therefore, in order to solve the above technical problems, it is necessary to develop a new type of coverless fuel filler cap.

[0004] Chinese patent application number CN201811479673.4 discloses an easy-to-install coverless fuel filler cap. The purpose is to refuel without unscrewing the fuel filler cap. Refueling can be done by pressing open the first sealing cover and the second sealing cover in sequence with a fuel gun, avoiding time-consuming and laborious repetitive operations. However, the problems of easy breakage of the coverless fuel filler cap due to impact, complex assembly and high cost are not solved. Summary of the invention

[0005] Purpose of the invention: In order to overcome the above shortcomings, the purpose of the present invention is to provide a new type of coverless fuel filler cap with a reasonable structural design. The coverless fuel filler cap body is assembled in an integrally molded fuel filler pipe and the upper flip door, lower flip door and shell are all designed with snap connections, which makes the cost lower and also has a separation protection function. After a collision, the coverless fuel filler cap body remains sealed, which improves safety and has broad application prospects.

[0006] Technical solution: A new type of coverless fuel filler cap, including a coverless fuel filler cap body, which is assembled in an integrally molded fuel filler pipe; the coverless fuel filler cap body includes a shell, the interior of the shell is divided into a guide part and a guide part from top to bottom, the guide part is used to guide the fuel gun to be inserted into the shell, and the guide part is used to guide the oil into the integrally molded fuel filler pipe; the top of the shell is set as an opening, the shell is equipped with an upper cover at the opening position, and the upper cover is provided with a fuel gun socket; the shell is provided with an upper flip door at the upper shell of the guide part, and the upper flip door is connected to the upper shell by a snap The upper flip door, the upper shell and the upper cover cooperate to seal the opening of the shell; the upper flip door is also provided with an upper flip door torsion spring, one end of which is fixed on the upper flip door and the other end is fixed on the shell, and the upper flip door rotates around the center of the upper flip door torsion spring to open or close the opening of the shell; the lower shell of the shell located at the upper end of the guide part is provided with a lower flip door, and the lower flip door is connected to the lower shell by a snap; the lower flip door is also provided with a lower flip door torsion spring, one end of which is fixed on the lower flip door and the other end is fixed on the shell, and the upper cover of the lower flip door rotates around the center of the lower flip door torsion spring to open or close the shell.

[0007] The novel coverless fuel filler cap described in the present invention has a reasonable structural design. The coverless fuel filler cap body is assembled in the one-piece molded fuel filler pipe, which solves the technical problem in the prior art that the outer diameter of the coverless fuel filler cap is too large, resulting in the inability to directly expand the oil pipe head matched with it on the main pipe and the need to adopt a two-stage welding process to fix it on the fuel filler pipe, thereby eliminating the welding process and reducing the cost; the upper cover and shell of the upper and lower flip doors are connected by snap-fit ​​connection, which is simple and economical to assemble, avoiding the problems of welding penetration, cold welding and leaking welding caused by the unstable welding process in the prior art where the flip door and the shell are connected by welding; the upper and lower flip doors are opened and closed by torsion springs. If there is negative pressure in the fuel system, the upper and lower flip doors can be opened to replenish air, thereby eliminating the provision of the vent valve, avoiding the technical problems of excessive assembly tolerance and sticking of the sealing gasket in the valve, thereby affecting the sealing performance of the valve, caused by assembling the vent valve through the assembly process, and reducing the cost.

[0008] When refueling, the refueling gun is inserted from the refueling gun socket on the upper cover, the refueling gun squeezes the upper cover of the upper flip door, the upper cover of the upper flip door rotates around the center of the torsion spring of the upper flip door to open the upper flip door, and the refueling gun is inserted deeper under the guiding action of the guide part until the refueling gun squeezes the upper cover of the lower flip door, the upper cover of the lower flip door rotates around the center of the torsion spring of the lower flip door to open the lower flip door, and the gun head of the refueling gun extends into the guide part, and the guide part guides the oil of the refueling gun into the inside of the one-piece molded refueling pipe to start refueling; after refueling is completed, an outward pulling force is applied to the refueling gun, so that the refueling gun is pulled out of the shell body through the guiding action of the guide part, and after the force on the upper and lower flip doors disappears, they return to the initial state under the action of the torsion springs of the upper and lower flip doors to be closed.

[0009] As can be seen from the above, the structural design of the coverless fuel filler cap makes it unnecessary to remove the fuel filler cap during the entire refueling process, which simplifies the refueling operation, saves refueling time, is convenient and practical, and the plugging and unplugging of the fuel gun and the opening and closing of the upper and lower flip doors occur simultaneously in an instant. Compared with the existing technology, it can effectively avoid the leakage of fuel vapor caused by opening the cover first and then inserting the fuel gun or pulling out the fuel gun first and then closing the cover, greatly reducing the amount of fuel vapor leaking into the air during refueling, and has broad application prospects.

[0010] Furthermore, in the above-mentioned novel coverless fuel filler cap, a separation protection mechanism is arranged on the outer periphery of the upper cap, and the wall thickness of the separation protection mechanism is 1.0-1.5 mm.

[0011] By arranging a separation protection mechanism on the outer periphery of the upper cover, the function of separation protection can be achieved. When the coverless fuel filler cap is hit, the separation protection mechanism is damaged, thereby maintaining the integrity of the coverless fuel filler cap body. This solves the technical problem in the prior art that the coverless fuel filler cap is difficult to seal the fuel pipe, fuel leaks, and causes huge safety risks due to the rupture of the coverless fuel filler cap caused by severe impact during use.

[0012] Furthermore, in the above-mentioned new type of coverless fuel filler cap, one side of the upper flip door is connected to the end of the upper flip door torsion spring and the other side is rotated relative to the shell to open or close the shell, and the upper flip door is rotated around the center of the upper flip door torsion spring to open by squeezing when the fuel gun is inserted, and after the fuel gun is pulled out, the upper flip door torsion spring resets and the upper flip door returns to an initial state and remains closed; one side of the lower flip door is connected to the end of the lower flip door torsion spring and the other side is rotated relative to the shell to open or close the shell, and the lower flip door is rotated around the center of the lower flip door torsion spring to open by squeezing when the fuel gun is inserted, and after the fuel gun is pulled out, the lower flip door torsion spring resets and the lower flip door returns to an initial state and remains closed.

[0013] Furthermore, in the above-mentioned new type of coverless fuel filler cap, a guide pipe is provided at the lower part of the guide part, and the structure of the guide pipe is funnel-shaped. The large end of the guide pipe of the funnel structure passes through and connects the upper part of the guide part and the small end and extends deep into the interior of the one-piece molded fuel filler pipe.

[0014] The structural design of the guide part is conducive to the oil being gathered at the small end of the guide tube for concentration, which can significantly speed up the flow rate of the oil.

[0015] Furthermore, in the above-mentioned new type of coverless fuel filler cap, a V-shaped sealing ring is arranged between the shell and the one-piece molded fuel filler pipe; a D-shaped sealing ring is arranged between the upper cover and the shell; and an upper flip door sealing ring and a lower flip door sealing ring are respectively arranged on the upper flip door and the lower flip door.

[0016] By arranging sealing rings at multiple locations, the coverless fuel filler cap has excellent sealing performance.

[0017] Furthermore, in the above-mentioned novel coverless fuel filler cap, the upper flip door and the lower flip door are made of conductive PPA material.

[0018] Furthermore, in the above-mentioned novel coverless fuel filler cap, the material of the upper cap is PA6, 15% glass fiber and 2% carbon black.

[0019] The beneficial effects of the present invention are:

[0020] (1) The novel coverless fuel filler cap of the present invention has a reasonable structural design. The fuel filler cap does not need to be removed during the entire refueling process, which simplifies the refueling operation, saves refueling time, and is convenient and practical. Moreover, the plugging and unplugging of the fuel gun and the opening and closing of the upper and lower flip doors occur simultaneously in an instant. Compared with the prior art, it can effectively avoid the leakage of fuel vapor caused by opening the cover first and then inserting the fuel gun or pulling out the fuel gun first and then closing the cover, greatly reducing the amount of fuel vapor leaking into the air during refueling, and has broad application prospects.

[0021] (2) The novel coverless fuel filler cap of the present invention has a coverless fuel filler cap body assembled in an integrally formed fuel filler pipe, which solves the technical problem in the prior art that the outer diameter of the coverless fuel filler cap is too large, so that the fuel pipe head matched with it cannot be directly expanded on the main pipe and needs to be fixed on the fuel filler pipe by a two-stage welding process, thereby eliminating the welding process and reducing the cost;

[0022] (3) The new type of coverless fuel filler cap of the present invention has the upper cover and the shell of the upper and lower flip doors connected by snap-fit ​​connection, which is simple and economical to assemble, and avoids the problems of welding penetration, cold welding and leaking welding caused by the unstable welding process in the prior art where the flip door and the shell are connected by welding.

[0023] (4) The new type of coverless fuel filler cap of the present invention, the upper flip door and the lower flip door are opened and closed by a torsion spring. If there is negative pressure in the fuel system, the upper flip door and the lower flip door can be opened to replenish air, thereby eliminating the provision of a vent valve, avoiding the technical problems of excessive assembly tolerance caused by assembling the vent valve through an assembly process, and the sealing gasket in the valve being stuck, thereby affecting the sealing performance of the valve, and also making the cost lower;

[0024] (5) The novel fuel filler cap without a cap described in the present invention can play a role of separation protection by providing a separation protection mechanism on the outer periphery of the upper cap. When the fuel filler cap without a cap is hit, the separation protection mechanism is damaged, thereby maintaining the integrity of the fuel filler cap without a cap, thereby solving the technical problem in the prior art that the fuel filler cap without a cap is difficult to seal the fuel pipe, fuel leaks, and causes huge safety risks due to the rupture of the fuel filler cap without a cap when it is hit. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the novel coverless fuel filler cap of the present invention;

[0026] Figure 2 It is a front view of the novel coverless fuel filler cap of the present invention;

[0027] Figure 3 It is an overall cross-sectional view of the coverless fuel filler cap body of the novel coverless fuel filler cap of the present invention;

[0028] Figure 4 It is a schematic diagram of the structure of the coverless fuel filler cap body upward flip door of the novel coverless fuel filler cap of the present invention;

[0029] Figure 5 It is a schematic diagram of the structure of the lower flip door of the coverless fuel filler cap body of the novel coverless fuel filler cap of the present invention;

[0030] Figure 6 This is a partial schematic diagram of the novel fuel filler cap without a cover of the present invention;

[0031] In the figure: coverless fuel filler cap body 1, shell 11, guide part 111, guide part 112, upper shell 113, lower shell 114, guide pipe 115, upper cover 12, fuel gun socket 121, separation protection mechanism 122, upper flip door 13, upper flip door sealing ring 131, upper flip door torsion spring 14, lower flip door 15, lower flip door sealing ring 151, lower flip door torsion spring 16, one-piece molded fuel filler pipe 2, V-shaped sealing ring 21, D-shaped sealing ring 22, buckle a, wall thickness b of separation protection mechanism. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-6And specific examples further illustrate the present invention.

[0033] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] like Figure 1-6 The novel coverless fuel filler cap of the above structure shown comprises a coverless fuel filler cap body 1, which is assembled in an integrally molded fuel filler pipe 2; the coverless fuel filler cap body 1 comprises a shell 11, the interior of the shell 11 is divided into a guide portion 111 and a guide portion 112 from top to bottom, the guide portion 111 is used to guide the fuel gun to be inserted into the shell 11, and the guide portion 112 is used to guide the oil into the integrally molded fuel filler pipe 2; the top end of the shell 11 is set as an opening, and the shell 11 is equipped with an upper cover 12 at the opening position, and the upper cover 12 is provided with a fuel gun socket 121; the shell 11 is provided with an upper flip door 13 at the upper shell 113 of the guide portion 111, and the upper flip door 13 is connected to the upper shell 113 by a buckle, The upper flip door 13, the upper shell 113 and the upper cover 12 cooperate to seal the opening of the shell 11; the upper flip door 13 is also provided with an upper flip door torsion spring 14, one end of which is fixed on the upper flip door 13 and the other end is fixed on the shell 11, and the upper flip door 13 rotates around the center of the upper flip door torsion spring 14 to open or close the opening of the shell 11; the lower shell 114 of the shell 11 located at the upper end of the guide part 112 is provided with a lower flip door 15, and the lower flip door 15 is connected to the lower shell 114 by a snap; the lower flip door 15 is also provided with a lower flip door torsion spring 16, one end of which is fixed on the lower flip door 15 and the other end is fixed on the shell 11, and the upper cover of the lower flip door 15 rotates around the center of the lower flip door torsion spring 16 to open or close the shell 11.

[0035] In addition, a separation protection mechanism 122 is provided on the outer periphery of the upper cover 12 , and the wall thickness of the separation protection mechanism 122 is 1.0-1.5 mm.

[0036] In addition, one side of the upper flip door 13 is connected to the end of the upper flip door torsion spring 14 and the other side is rotated relative to the shell body 11 to open or close the shell body 11. The upper flip door 13 is squeezed when the gas gun is inserted to rotate around the center of the upper flip door torsion spring 14 to open. After the gas gun is pulled out, the upper flip door torsion spring 14 is reset to return the upper flip door 13 to the initial state and remain closed; one side of the lower flip door 15 is connected to the end of the lower flip door torsion spring 16 and the other side is rotated relative to the shell body 11 to open or close the shell body 11. The lower flip door 15 is squeezed when the gas gun is inserted to rotate around the center of the lower flip door torsion spring 16 to open. After the gas gun is pulled out, the lower flip door torsion spring 16 is reset to return the lower flip door 15 to the initial state and remain closed.

[0037] In addition, a guide tube 115 is provided at the lower part of the guide part 112. The structure of the guide tube 115 is funnel-shaped. The large end of the guide tube 115 with the funnel structure passes through and connects the upper part of the guide part 112 and the small end to extend into the interior of the one-piece molded refueling pipe 2.

[0038] Furthermore, a V-shaped sealing ring 21 is provided between the shell 11 and the integrally formed refueling pipe 2; a D-shaped sealing ring 22 is provided between the upper cover 12 and the shell 11; and an upper flip door sealing ring 131 and a lower flip door sealing ring 151 are provided on the upper flip door 13 and the lower flip door 15, respectively.

[0039] In addition, the upper flip door 13 and the lower flip door 15 are made of conductive PPA material. The upper cover 12 is made of PA6, 15% glass fiber and 2% carbon black. Example

[0040] Based on the above structural foundation, such as Figures 1 to 6 shown.

[0041] The novel coverless fuel filler cap of the present invention has a reasonable structural design and is easy to use. When refueling, the fuel gun is inserted from the fuel gun socket 121 on the upper cover 12, and the fuel gun squeezes the upper cover of the upper flip door 13, and the upper cover of the upper flip door 13 rotates around the center of the upper flip door torsion spring 14 to open the upper flip door 13. The fuel gun is inserted deeper under the guiding action of the guide part 111 until the fuel gun squeezes the upper cover of the lower flip door 15, and the upper cover of the lower flip door 15 rotates around the center of the lower flip door torsion spring 16 to open the lower flip door 15, and the gun head of the fuel gun extends into the guide part 112, and the guide part 112 guides the oil of the fuel gun to enter the inside of the one-piece molded fuel filling pipe 2 to start refueling; after refueling, an outward pulling force is given to the fuel gun, so that the fuel gun is pulled out of the housing 11 through the guiding action of the guide part 111, and after the force on the upper flip door 13 and the lower flip door 15 disappears, they return to the initial state under the action of the upper flip door torsion spring 14 and the lower flip door torsion spring 16 to achieve closure.

[0042] As can be seen from the above, the structural design of the coverless fuel filler cap makes it unnecessary to remove the fuel filler cap during the entire refueling process, which simplifies the refueling operation, saves refueling time, is convenient and practical, and the plugging and unplugging of the fuel gun and the opening and closing of the upper flip door 13 and the lower flip door 15 occur simultaneously in an instant. Compared with the prior art, it can effectively avoid the leakage of fuel vapor caused by opening the cover first and then inserting the fuel gun or pulling out the fuel gun first and then closing the cover, greatly reducing the amount of fuel vapor leaking into the air during refueling, and has broad application prospects.

[0043] Furthermore, the coverless fuel filler cap body 1 is assembled in the one-piece molded fuel filler pipe 2, which solves the technical problem in the prior art that the outer diameter of the coverless fuel filler cap is too large, resulting in the inability to directly expand the oil pipe head paired with it on the main pipe, and the need to use a two-stage welding process to fix it on the fuel filler pipe, thereby eliminating the welding process and reducing the cost; the upper cover and shell 11 of the upper flip door 13 and the lower flip door 15 are both connected by snap-fit, which is simple and economical to assemble, avoiding the problems of welding penetration, cold welding and leaking welding caused by the unstable welding process when the flip door and the shell 11 are connected by welding in the prior art; the upper flip door 13 and the lower flip door 15 are both opened and closed by torsion springs. If there is negative pressure in the fuel system, the upper flip door 13 and the lower flip door 15 can be opened to replenish air, thereby eliminating the setting of the vent valve, avoiding the technical problems of excessive assembly tolerance and stuck sealing gasket in the valve caused by assembling the vent valve through the assembly process, thereby affecting the sealing performance of the valve, and reducing the cost.

[0044] Furthermore, by arranging a separation protection mechanism 122 on the outer periphery of the upper cover 12, a separation protection function can be achieved. When the coverless fuel filler cap body 1 is hit, the separation protection mechanism 122 is damaged, thereby maintaining the integrity of the coverless fuel filler cap body 1, thereby solving the technical problem in the prior art that the coverless fuel filler cap is difficult to seal the fuel pipe, fuel leaks, and causes huge safety risks due to the rupture of the coverless fuel filler cap caused by severe impact during use.

[0045] Furthermore, the structural design of the guide portion 112 is conducive to the oil being gathered at the small end of the guide tube for concentration, which can significantly speed up the flow rate of the oil.

[0046] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0047] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0048] In addition, the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A coverless fuel filler cap, characterized in that: The invention comprises a coverless fuel filler cap body (1), wherein the coverless fuel filler cap body (1) is assembled in an integrally molded fuel filler pipe (2); the coverless fuel filler cap body (1) comprises a shell (11), wherein the interior of the shell (11) is divided into a guide portion (111) and a guide portion (112) from top to bottom, wherein the guide portion (111) is used to guide a fuel gun to be inserted into the shell (11), and the guide portion (112) is used to guide oil to enter the integrally molded fuel filler pipe (2); the top end of the shell (11) is arranged to be an opening, and an upper cover (12) is installed on the shell (11) at the opening position, and a fuel gun socket (121) is arranged on the upper cover (12); the shell (11) is provided with an upper flip door (13) at the upper shell (113) of the guide portion (111), and the upper flip door (13) is connected to the upper shell (113) by a buckle, and the upper flip door (13) and the upper cover (121) are connected to each other by a buckle. The housing (113) and the upper cover (12) cooperate to seal the opening of the housing (11); the upward flip door (13) is also provided with an upward flip door torsion spring (14), one end of the upward flip door torsion spring (14) is fixed to the upward flip door (13) and the other end is fixed to the housing (11); the upward flip door (13) rotates around the center of the upward flip door torsion spring (14) to open or close the opening of the housing (11); the housing (11) is located at the guide portion (112) The lower shell (114) at the upper end is provided with a downward flip door (15), and the downward flip door (15) is connected to the lower shell (114) by means of a buckle; the downward flip door (15) is also provided with a downward flip door torsion spring (16), one end of the downward flip door torsion spring (16) is fixed to the downward flip door (15) and the other end is fixed to the shell (11), and the upper cover of the downward flip door (15) rotates around the center of the downward flip door torsion spring (16) to open or close the shell (11); A separation protection mechanism (122) is provided on the outer periphery of the upper cover (12), and the wall thickness of the separation protection mechanism (122) is 1.0-1.5 mm; One side of the upper flip door (13) is connected to the end of the upper flip door torsion spring (14) and the other side is rotated relative to the shell (11) to open or close the shell (11). When the fuel gun is inserted, the upper flip door (13) rotates around the center of the upper flip door torsion spring (14) to open. After the fuel gun is pulled out, the upper flip door torsion spring (14) is reset so that the upper flip door (13) returns to the initial state and remains closed. One side of the lower flip door (15) is connected to the end of the lower flip door torsion spring (16) and the other side is rotated relative to the shell (11) to open or close the shell (11). When the fuel gun is inserted, the lower flip door (15) rotates around the center of the lower flip door torsion spring (16) to open. After the fuel gun is pulled out, the lower flip door torsion spring (16) is reset so that the lower flip door (15) returns to the initial state and remains closed. The upward-flipping door (13) and the downward-flipping door (15) are made of conductive PPA material.

2. The coverless fuel filler cap according to claim 1, characterized in that: A flow guide tube (115) is provided at the lower portion of the flow guide portion (112). The flow guide tube (115) has a funnel-shaped structure. The large end of the flow guide tube (115) with the funnel-shaped structure passes through and connects the upper portion of the flow guide portion (112) and the small end thereof and penetrates into the interior of the integrally molded refueling pipe (2).

3. The capless fuel filler cap according to claim 1, characterized in that: A V-shaped sealing ring (21) is provided between the housing (11) and the integrally formed refueling pipe (2); a D-shaped sealing ring (22) is provided between the upper cover (12) and the housing (11); and an upper flip door sealing ring (131) and a lower flip door sealing ring (151) are provided on the upper flip door (13) and the lower flip door (15), respectively.

4. The capless fuel filler cap according to claim 1, characterized in that: The material of the upper cover (12) is PA6, 15% glass fiber and 2% carbon black.

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