A fuel tank cap

Abstract

The utility model relates to the technical field of oil tank cover, disclose an oil tank cover, the threaded post and the buckle cap are all cavity structure, be equipped with the baffle in the buckle cap, be provided with the airflow channel of intercommunication with outside between the threaded post and the buckle cap, the threaded post inside is provided with the air inlet and outlet valve, the air inlet and outlet valve includes upper valve core and lower valve core, the upper valve core includes upper gasket and lower gasket, the upper gasket is sleeved in the convex part of lower gasket and has the gap between upper gasket and threaded post inner wall, the threaded post is equipped with the support platform, the lower valve core is located in the middle part of support platform, and there is the gap between lower valve core and support platform inner wall, be equipped with first spring between the lower gasket and upper plate, be equipped with second spring between the lower valve core and lower plate, the lower plate is located in the bottom of threaded post, and a plurality of vent holes are seted up on it. The utility model provides an oil tank cover, which adds a second airflow channel controlled by an air inlet and outlet valve in the oil tank cover based on the traditional sealing ring deformation channel.

Description

Technical Field

[0001] This utility model relates to the field of automotive fuel tank cap technology, specifically a fuel tank cap. Background Technology

[0002] A car fuel tank cap is a device used to seal the fuel filler neck of a car's fuel tank. Its main function is to seal the filler neck to prevent gasoline and its vapor from leaking out of the fuel tank and to prevent external dust from entering the fuel tank. During normal operation of a car, the fuel supply system continuously supplies fuel to the engine. The pressure inside the fuel tank gradually decreases as the fuel level drops until a negative pressure occurs. At this time, the fuel tank cap is in intake mode, with the intake valve opening to introduce clean air into the fuel tank. However, in the event of severe bumps or impacts to the fuel tank, the internal pressure may become too high, causing the fuel tank to rupture and fuel to leak out. In this situation, the fuel tank cap is in exhaust mode, with the exhaust valve opening to release a large flow of air; that is, the fuel tank cap has a breathing function.

[0003] Therefore, the purpose of this application is to design a fuel tank cap structure that allows the fuel tank opening to "breathe". Summary of the Invention

[0004] In view of the shortcomings of the existing technology, this utility model provides a fuel tank cover.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a fuel tank cover, wherein both the threaded post and the cover are hollow structures, the cover has a partition inside, and an airflow channel communicating with the outside is provided between the threaded post and the cover;

[0006] The threaded column is equipped with an inlet / outlet valve, which includes an upper valve core and a lower valve core. The upper valve core includes an upper washer and a lower washer. The lower washer has a through structure in the middle. The upper washer is fitted onto the protruding part of the lower washer and leaves a gap between it and the inner wall of the threaded column.

[0007] The threaded column is provided with a support platform, and the lower valve core is located in the middle of the support platform, with a gap between it and the inner wall of the support platform.

[0008] A first spring is provided between the lower washer and the upper plate, and a second spring is provided between the lower valve core and the lower plate;

[0009] The lower plate is located at the bottom of the threaded column and has several ventilation holes.

[0010] Preferably, the top of the threaded column is provided with an outer ring, the outer edge of which has a toothed structure, forming an air passage between it and the inner wall of the cover.

[0011] Preferably, the outer ring is snapped and fixed to the inner wall of the cover.

[0012] Preferably, the upper plate has a through hole in the middle, and the through hole is covered with a removable dustproof net.

[0013] Preferably, the vertical cross-section of the lower valve core is Y-shaped, with the upper end face recessed downward in the middle and a lip ring provided on the outer side for sealing contact with the bottom surface of the lower gasket.

[0014] Preferably, the surface of the upper gasket is provided with air holes.

[0015] Preferably, the inner cavity of the cover is divided into several interconnected sub-cavities by a partition.

[0016] Preferably, the outer ring of the upper washer is rotatably connected to a collar, the outer wall of the collar is provided with a threaded groove, and the inner wall of the threaded post is provided with a protrusion at a corresponding position;

[0017] The end face of the collar is provided with a through groove, and the bottom is provided with a mounting platform integrated with the upper washer. The mounting platform is provided with vent holes.

[0018] When the upper valve core is closed, the through groove and the vent hole are misaligned; when the upper valve core is open, the collar rotates to align the through groove and the vent hole.

[0019] This invention provides a fuel tank cap with a dual-channel air pressure balance structure. Based on the traditional sealing ring deformation channel, a second airflow channel controlled by inlet and outlet valves is added inside the fuel tank cap. Through the cooperation of the upper valve core, lower valve core, and spring, automatic control of positive pressure exhaust and negative pressure intake is achieved, effectively avoiding the sealing ring failure problem caused by oil and dirt adhesion. Furthermore, the rotatable collar design allows for dynamic opening and closing of the flow channel, significantly reducing dust accumulation and improving long-term reliability. This structure enhances the fuel tank cap's fault tolerance and environmental adaptability, ensuring a stable balance of air pressure inside and outside the fuel tank. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the appearance and structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the vertical cross-section of this utility model;

[0022] Figure 3 This is a schematic sectional view from the axial side;

[0023] Figure 4 This is a schematic diagram of the valve core structure in Example 2. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1:

[0026] Please refer to the attached drawing, a fuel tank cap, for reference. Figure 1 As shown, it includes a cover 11 and a threaded post 3 connected to the bottom of the cover 11. In use, the threaded post 3 is screwed into the oil tank opening.

[0027] This embodiment mainly discloses a fuel tank cover structure that facilitates air intake and exhaust and is used to balance the air pressure in the fuel tank.

[0028] Reference Figure 2 As shown, a typical fuel tank cap has an elastic sealing ring at the root of the threaded post 3. When the internal air pressure of the fuel tank is too high or too low, the gas will squeeze the sealing ring, causing it to deform and allowing the gas to flow.

[0029] This type of single-channel fuel tank cap has poor fault tolerance, especially since there may be viscous oil residue at the fuel tank opening, which can cause the sealing ring to deform and become obstructed, thus failing and preventing air from entering and exiting.

[0030] Therefore, in this embodiment, a second channel is added on the basis of the single channel of the sealing ring. The second channel is located inside the fuel tank cap.

[0031] Reference Figure 2 As shown, both the threaded post 3 and the cover 11 have hollow internal structures. Air inlet and outlet valves are installed within these hollow structures.

[0032] Reference Figure 2 and Figure 3 An airflow channel connecting the threaded post 3 and the cover 11 to the external environment also needs to be formed. As shown in the figure, an integral outer ring 1 is provided at the top of the threaded post 3. The outer ring 1 has a toothed structure, that is, the outer edge of the outer ring 1 is provided with spaced protruding teeth. The area between the protruding teeth forms an air passage 11 with the inner wall of the cover 11, and the protruding teeth themselves are fixedly engaged with the inner wall of the cover 11.

[0033] The structure of the inlet / outlet valve includes an upper plate 2 connected to the end of the threaded post 11, with a through hole in the middle of the upper plate 2. The inner cavity 111 enclosed by the cover 11 is connected to the inner cavity of the threaded post 11 through the through hole in the upper plate 2. It is worth noting that, referring to... Figure 2The inner cavity 111 of the cover 11 has a relatively large space, and several partitions 112 are set on its inner wall to divide it into several interconnected sections. This partitioned structure has a flow stabilizing effect. Secondly, the partitions 112 block and absorb, preventing large amounts of dust and oil from entering. To improve the dustproof effect, a removable and replaceable dustproof mesh is covered on the through-hole structure of the upper plate 2.

[0034] A valve core structure for an air valve is located at the center of the internal part of the threaded column 1. The valve core structure includes an upper valve core and a lower valve core 8. (Refer to...) Figure 2 as well as Figure 3 As shown, the upper valve core includes an upper washer 4 and a lower washer 5. (As indicated...) Figure 2 As shown, the lower washer 5 has an inverted T-shaped structure with a central bulge that is hollow and allows for gas flow. The upper washer 4 is an annular structure fitted onto the central bulge of the lower washer 5. The upper washer 4 has a stepped structure in its center, and the bottom of the upper plate 2 also has a stepped structure corresponding to the upper washer 4. A first spring, a columnar spring, is installed between the upper plate 2 and the upper washer 4, with its ends confined within the stepped structure of the upper plate 2 and the upper washer 4.

[0035] The surface of the upper washer 4 is provided with air holes 6, and there is a gap between the outer edge of the upper washer 4 and the inner wall of the threaded post 3.

[0036] like Figure 2 as well as Figure 3 As shown, a support platform 81 is provided at the middle position of the threaded column 3. The middle of the support platform 81 is through, and the lower valve core 8 is housed in the middle of the support platform 81. There is a gap between the outer ring of the lower valve core 8 and the inner wall of the support platform 81. Under the action of the first spring, the bottom surface of the lower washer 5 contacts and abuts against the upper end surface of the support platform 81.

[0037] Continue to refer to Figure 2 as well as Figure 3 As shown, the vertical cross-sectional structure of the lower valve core 8 is Y-shaped. The upper end face of the lower valve core 8 is concave downwards in the middle. A lip ring is provided on the outer side of the upper end face of the lower valve core 8. A lower plate 9 is provided at the bottom of the threaded column 3, and several vent holes are opened on the end face of the lower plate 9. A second spring is installed between the lower plate 9 and the lower valve core 8. The second spring is also a columnar spring, and its function is to press the lower valve core 8 against the bottom of the lower washer 5, and the lip ring of the lower valve core 8 is in sealing contact with the bottom surface of the lower washer 5.

[0038] The following describes the air intake and exhaust processes. In the intake process, the air pressure in the tank is lower than the external atmospheric pressure. Therefore, under the influence of negative pressure, air enters the inner cavity 111 of the cover 11 through the gap between the outer ring 1 and the inner wall of the cover 11. It then continues downward through the through-hole of the upper plate 2, passing through the middle of the lower washer 5, reaching the upper surface of the lower valve core 8, and pressing it downwards. This creates a gap between the lower valve core 8 and the lower washer 5. Since the lower washer 8 is still in contact with the support platform 81, the gas exits downwards from the middle of the support platform 81 and enters the tank through the hole in the lower plate 9. In the exhaust process, the air pressure in the tank is greater than the external atmospheric pressure. Therefore, the gas enters the inner cavity of the threaded column 3 from the tank through the lower plate 9. The lower washer 5 is further pushed open. At this time, the first spring remains contracted, and the gas is output from the gap between the support platform 81 and the lower washer 5, continues to rise through the center of the upper plate 2, and is discharged from the gap between the outer ring 1 and the cover 11.

[0039] Example 2

[0040] Reference Figure 4 As shown, the difference between this embodiment and Embodiment 1 lies in the structure of the upper washer 4 in the upper valve core. In Embodiment 1, during gas discharge, the gas exits through the gap between the upper washer 4 and the inner wall of the threaded post 3. This small gap is in a statically open state, making it prone to dust accumulation and affecting gas discharge efficiency. Furthermore, since this gap is normally open, during gas intake, dust can enter above the support platform 81 and reach the connection between the support platform 81 and the lower washer 5, thus affecting gas discharge at this point.

[0041] Therefore, in this embodiment, to solve this problem, a rotatable collar 41 is provided on the outer ring of the upper washer 4, and the collar 41 is rotatably connected to the body of the upper washer 4. The outer circumferential surface of the collar 41 is provided with a threaded groove, and a protrusion is provided at the position corresponding to the inner wall of the threaded post 3. The protrusion and the threaded groove are configured such that when the collar 41 slides up and down, the threaded groove is pressed by the protrusion, causing the collar 41 to rotate at a small angle.

[0042] Continue to refer to Figure 4 As shown, the end face of the collar 41 has a through groove 411, and the bottom of the collar 41 has a mounting platform 42 integral with the upper washer 4 body. The mounting platform 42 also has a through vent hole. When the upper valve core is closed, i.e. Figure 4 In the state where the through groove 411 and the vent hole are offset from each other, when the upper valve core is opened, that is, when the upper washer 4 and the lower washer 5 are pushed upward by air pressure, the sleeve 41 rotates so that the through groove 411 and the vent hole coincide, thereby allowing air to pass out.

[0043] With this design, the flow channel is dynamically rotatable, making it less prone to dust accumulation. Moreover, in practical applications, during air intake, because this area is in a closed state, the airflow will not enter the position between the upper washer 4 and the support platform 81, thus ensuring that dust will not affect the contact position between the lower washer and the support platform 81, and preventing dust from affecting the ventilation at this point.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fuel tank cap, characterized in that, It includes a threaded column (3) and a snap cover (11). Both the threaded column (3) and the snap cover (11) are hollow structures. The snap cover (11) is provided with a partition (112) inside. An airflow channel communicating with the outside is provided between the threaded column (3) and the snap cover (11). The threaded column (3) is provided with an inlet / outlet valve. The inlet / outlet valve includes an upper valve core and a lower valve core (8). The upper valve core includes an upper washer (4) and a lower washer (5). The lower washer (5) has a through structure in the middle. The upper washer (4) is fitted on the protruding part of the lower washer (5) and there is a gap between it and the inner wall of the threaded column (3). The threaded column (3) is provided with a support platform (81), and the lower valve core (8) is located in the middle of the support platform (81) with a gap between it and the inner wall of the support platform (81). A first spring is provided between the lower washer (5) and the upper plate (2), and a second spring is provided between the lower valve core (8) and the lower plate (9); The lower plate (9) is located at the bottom of the threaded column (3) and has several ventilation holes.

2. The fuel tank cap according to claim 1, characterized in that, The top of the threaded column (3) is provided with an outer ring (1), the outer edge of which has a toothed structure, forming an air passage between it and the inner wall of the cover (11).

3. A fuel tank cover according to claim 2, characterized in that, The outer ring (1) is snapped and fixed to the inner wall of the cover (11).

4. A fuel tank cap according to claim 1, characterized in that, The upper plate (2) has a through hole in the middle, and a removable dustproof net is provided over the through hole.

5. A fuel tank cover according to claim 1, characterized in that, The vertical cross-section of the lower valve core (8) is Y-shaped, with the middle of its upper end face recessed downwards and a lip ring provided on the outer side for sealing contact with the bottom surface of the lower gasket (5).

6. A fuel tank cover according to claim 1, characterized in that, The upper washer (4) has pores (6) on its surface.

7. A fuel tank cover according to claim 1, characterized in that, The inner cavity (111) of the cover (11) is divided into several interconnected sub-cavities by a partition (112).

8. A fuel tank cap according to any one of claims 1-7, characterized in that, The outer ring of the upper washer (4) is rotatably connected to a collar (41), the outer wall of the collar (41) is provided with a threaded groove, and the inner wall of the threaded post (3) is provided with a protrusion at the corresponding position. The end face of the collar (41) is provided with a through groove (411), and the bottom is provided with a mounting platform (42) integrated with the upper washer (4). The mounting platform (42) is provided with a vent hole. When the upper valve core is closed, the through groove (411) is misaligned with the vent hole; when the upper valve core is open, the collar (41) rotates to align the through groove (411) with the vent hole.

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