Oil filling cover of oil tank

Abstract

The utility model relates to the technical field of oil tanks, in particular to an oil filling cover of an oil tank, which comprises a threaded seat, a gear ring, an upper cover and a driving piece, the upper cover drives the gear ring to rotate on the inner side of the threaded seat in the circumferential direction of the gear ring through the driving piece. After the upper cover is tightened, only one sound is made to remind a user that the fuel tank cover is tightened, so that the fuel tank cover can be tightened only through small-angle rotation without large-angle rotation, meanwhile, after the upper cover is tightened, the fuel tank cover can be automatically rebounded and reset, subsequent use is facilitated, the user can conveniently grasp the tightening force, and the fuel tank cover tightening device conforms to ergonomics and is suitable for popularization and application. The user experience is good, and the problems that after an existing oil filler cap is screwed down, the multi-sound of'pyridadao 'can be made, the rotation angle is large when the oil filler cap is screwed down, a user cannot conveniently master the screwing force, ergonomics is not met, and the user experience is not good are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil tanks, in particular to a refueling cap of an oil tank. Background Art

[0002] The fuel tank filler cap is a part of the car that covers the fuel tank filling port, usually located at the rear or side of the vehicle. It can prevent dust, water and foreign matter from entering the fuel tank, and also prevent gasoline leakage. When tightening the fuel tank cap, the fuel tank cap will make a "clicking" sound to remind the operator that the fuel tank cap has been tightened.

[0003] The utility model with announcement number CN213619336U discloses a plunger-type intelligent fuel filler cap, including: an upper cover, a cover body, a transmission mechanism and a drive mechanism. The upper cover and the cover body are connected to form a transmission cavity. The transmission mechanism is built into the transmission cavity and connected between the upper cover and the cover body. The drive mechanism is connected to the transmission mechanism for transmission.

[0004] As in the above-mentioned technical solution, the fuel cap will make multiple "click-click-click" sounds when tightened, and the fuel cap has a large rotation angle when tightened, which makes it inconvenient for users to control the tightening force, is not ergonomic, and results in a poor user experience. Utility Model Content

[0005] In view of this, the utility model proposes a fuel tank filler cap, the upper cover of which makes only one sound after being tightened, reminding the user that the fuel tank cap has been tightened. Therefore, the fuel tank cap can be tightened by only a very small angle rotation, and there is no need to rotate it at a large angle to tighten the fuel tank cap. At the same time, the upper cover can automatically rebound and reset after being tightened, which is convenient for subsequent use, conforms to ergonomics, and provides a good user experience. It solves the problem that the existing fuel tank cap will emit multiple "click" sounds after being tightened, and the fuel tank cap rotates at a large angle when tightened, which makes it inconvenient for the user to control the tightening force, is not very ergonomic, and results in a poor user experience.

[0006] The technical solution of the utility model is achieved in this way:

[0007] The utility model provides a fuel tank filling cap, comprising a threaded seat, a gear ring, an upper cover and a driving member, wherein:

[0008] The interior of the threaded seat is hollow, and the gear ring is sleeved on the inner side of the threaded seat;

[0009] The upper cover is sleeved on the outer side of one end of the threaded seat and is rotatably connected;

[0010] The driving member is arranged between the upper cover and the gear ring, and the upper cover drives the gear ring to rotate along the circumference of the gear ring on the inner side of the threaded seat through the driving member;

[0011] It also includes a return spring, a return dial block, a sounding spring and a sounding dial block, wherein:

[0012] There are a plurality of return springs in a circumferential annular array along the gear ring, one end of each of the return springs is fixedly arranged on one end of the threaded seat close to the upper cover, and the other end extends in the radial direction of the gear ring and in the direction of the gear ring;

[0013] The return block is provided at one side of each return spring sheet, one end of the return block selectively abuts against one end of the corresponding return spring sheet, and the other end is fixedly provided at the side of the gear ring close to one end of the threaded seat;

[0014] One end of the sound-generating spring is fixedly arranged on one end of the threaded seat close to the upper cover, and the other end extends along the axial direction of the gear ring and in the direction of the upper cover;

[0015] The sounding paddle block is arranged on one side of the sounding shrapnel, one end of the sounding paddle block is fixedly arranged on one end of the gear ring close to the upper cover, and the other end extends along the axial direction of the gear ring and in the direction of the threaded seat, for moving the sounding shrapnel to vibrate and produce sound.

[0016] On the basis of the above technical solution, preferably, a first protrusion and a second protrusion are fixedly provided on one side of the return block close to the return spring sheet, wherein:

[0017] The first protrusion and the return spring sheet are in contact with each other;

[0018] A gap of 2-5 mm is reserved between the second protrusion and the return spring sheet.

[0019] On the basis of the above technical solution, preferably, a third protrusion is fixedly provided at one end of the return block away from the gear ring, and a stopper is fixedly provided at the side of the gear ring close to one end of the upper cover, wherein:

[0020] The third protrusion and the stopper are in abutment with each other.

[0021] On the basis of the above technical solution, preferably, the sounding plectrum includes a support and a plectrum, wherein:

[0022] One end of the support is fixedly arranged on the gear ring, and the other end is arranged between the sound-generating spring and the upper cover;

[0023] One end of the plectrum is arranged on an end of the support away from the gear ring, and the other end is used to poke the sound-generating spring to vibrate and generate sound.

[0024] On the basis of the above technical solution, preferably, the driving member includes a linkage shaft and a spring, wherein:

[0025] The linkage shaft, the gear ring and the spring are coaxially arranged, and the linkage shaft is supported on the gear ring by the elastic force of the spring;

[0026] A sliding protrusion is fixedly provided on the side of the linkage shaft close to one end of the upper cover, and a latch portion is fixedly provided on the other end;

[0027] A sliding groove is provided inside the upper cover at a position corresponding to the sliding protrusion, and the sliding protrusion is slidably arranged in the sliding groove along the axial direction of the gear ring;

[0028] A pin hole is arranged at one end of the gear ring close to the linkage shaft, and the plug pin is inserted into the pin hole along the axial direction of the gear ring.

[0029] On the basis of the above technical solution, preferably, a positioning protrusion is provided at one end of the linkage shaft away from the gear ring, wherein:

[0030] One end of the spring is sleeved on the outer side of the positioning protrusion and abuts against one end of the linkage shaft away from the gear ring, and the other end abuts against a side of the upper cover facing the threaded seat.

[0031] On the basis of the above technical solution, preferably, the driving member further includes a push rod and a diaphragm, wherein:

[0032] The push rod and the gear ring are coaxially arranged, and the push rod penetrates the gear ring along the axial direction of the spring;

[0033] An air inlet hole is provided at one end of the threaded seat away from the upper cover;

[0034] The diaphragm is fixedly arranged inside the threaded seat and between the air inlet and the gear ring;

[0035] One end of the push rod abuts against an end of the diaphragm away from the air inlet hole, and the other end abuts against an end of the linkage shaft away from the spring.

[0036] On the basis of the above technical solution, preferably, an unlocking hole is provided at a position of the upper cover corresponding to the spring and extending through the axial direction of the gear ring, and a dust plug is embedded inside the unlocking hole.

[0037] On the basis of the above technical solution, preferably, it further comprises a gear ring, wherein:

[0038] The gear ring is sleeved between the gear ring and the threaded seat, the gear ring and the gear ring are rotatably connected, and the gear ring and the threaded seat are fixedly connected.

[0039] On the basis of the above technical solution, preferably, the side of the gear ring is provided with teeth, and the inner side wall of the threaded seat is provided with tooth grooves, wherein:

[0040] The teeth mesh in the tooth grooves.

[0041] The fuel tank refueling cap of the utility model has the following beneficial effects compared with the prior art:

[0042] (1) By setting a return dial block and a return spring piece, and by setting a sound dial block and a sound spring piece, it is convenient to tighten the fuel tank cap through the cooperation of the return dial block and the return spring piece, and after tightening, the sound dial block and the sound spring piece cooperate to realize a sound reminder. When the user hears a crisp sound from the sound spring piece, it reminds the user that the fuel tank cap has been tightened. At this time, the user can stop screwing the fuel tank cap. Compared with the existing technology, only a small angle of rotation is required to tighten the fuel tank cap, and a large angle of rotation is not required to tighten the fuel tank cap. It is convenient for users to control the tightening force, conforms to ergonomics, and has a good user experience.

[0043] (2) By setting a return switch block and a return spring, and by setting a sound switch block and a sound spring, it is convenient to release the grip on the fuel tank cap after hearing the crisp sound of the sound spring, and the upper cover will rebound and reset. The structure is novel, convenient for subsequent use, ergonomic, and has a good user experience.

[0044] (3) By providing the first protrusion and the second protrusion, the amplitude of the bending deformation of the return spring piece can be increased by the first protrusion and the second protrusion, which is beneficial to improving the rebound performance of the return spring piece and improving the rebound and reset effect of the upper cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 It is a front cross-sectional view of a fuel tank refueling cap of the utility model;

[0047] Figure 2 A first perspective perspective view of a portion of the present invention;

[0048] Figure 3 A partial stereoscopic view of the utility model from a second viewing angle;

[0049] Figure 4 A third perspective view of a portion of the present invention;

[0050] Figure 5 A three-dimensional diagram of the gear ring of the present utility model;

[0051] Figure 6 A three-dimensional diagram of the gear ring of the utility model;

[0052] Figure 7 It is a three-dimensional diagram of the upper cover of the utility model;

[0053] Figure 8 A three-dimensional diagram of a driving member of the utility model;

[0054] In the figure: 1, threaded seat; 2, gear ring; 3, upper cover; 4, driving member; 5, return spring piece; 6, return dial block; 7, sounding spring piece; 8, sounding dial block; 9, gear ring; 41, linkage shaft; 42, spring; 43, push rod; 44, diaphragm; 81, support; 82, dial piece; 101, stopper; 102, air inlet hole; 103, tooth groove; 201, pin hole; 301, slide groove; 302, unlocking hole; 401, sliding protrusion; 402, latch portion; 403, positioning protrusion; 601, first protrusion; 602, second protrusion; 603, third protrusion; 901, tooth. DETAILED DESCRIPTION

[0055] The following will be combined with the specific implementation of the utility model to clearly and completely describe the technical solution in the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0056] like Figure 1-8 As shown, a fuel tank filling cap of the utility model comprises a threaded seat 1, a gear ring 2, an upper cover 3 and a driving member 4, and also comprises a return spring piece 5, a return dial block 6, a sounding spring piece 7 and a sounding dial block 8.

[0057] The interior of the threaded seat 1 is hollow, the gear ring 2 is sleeved on the inner side of the threaded seat 1, the upper cover 3 is sleeved on the outer side of one end of the threaded seat 1 and is rotatably connected, the driving member 4 is arranged between the upper cover 3 and the gear ring 2, and the upper cover 3 drives the gear ring 2 to rotate along the circumference of the gear ring 2 on the inner side of the threaded seat 1 through the driving member 4, and there are multiple return springs 5 ​​along the circumferential annular array of the gear ring 2, one end of the multiple return springs 5 ​​is fixedly arranged on one end of the threaded seat 1 close to the upper cover 3, and the other end extends along the radial direction of the gear ring 2 and in the direction of the gear ring 2, and the return shift block 6 is on one side of each return spring 5 One is provided for each, one end of the return dial block 6 selectively abuts against one end of the corresponding return spring piece 5, and the other end is fixedly arranged on the side of the gear ring 2 close to the threaded seat 1, one end of the sounding spring piece 7 is fixedly arranged on the end of the threaded seat 1 close to the upper cover 3, and the other end extends along the axial direction of the gear ring 2 and in the direction of the upper cover 3, and the sounding dial block 8 is arranged on one side of the sounding spring piece 7, one end of the sounding dial block 8 is fixedly arranged on the end of the gear ring 2 close to the upper cover 3, and the other end extends along the axial direction of the gear ring 2 and in the direction of the threaded seat 1, for moving the sounding spring piece 7 to vibrate and make sound.

[0058] In the above structure, the threaded seat 1 is used to be screwed onto the fuel tank opening. When screwing, the upper cover 3 is held and screwed. During the screwing process, the return dial block 6 compresses the return spring piece 5 to bend and deform to drive the threaded seat 1 to be screwed onto the fuel tank opening. When tightened, the sound dial block 8 drives the sound spring piece 7 to make a crisp "click" sound, and the user is reminded through the sound that it has been tightened. At this time, the screwing of the upper cover 3 can be stopped. Compared with the prior art, only a very small angle rotation is required to tighten the fuel tank cap, and a large angle rotation is not required to tighten the fuel tank cap. At the same time, after hearing the crisp sound of the sound spring piece 7, release the hand holding of the fuel tank cap, and the upper cover 3 will rebound and reset. The structure is novel, convenient for subsequent use, and convenient for users to control the tightening force. It conforms to ergonomics and has a good user experience.

[0059] In order to increase the amplitude of the flexural deformation of the return spring piece 5, a first protrusion 601 and a second protrusion 602 are fixedly provided on one side of the return block 6 close to the return spring piece 5, wherein Figure 2 As shown, the first protrusion 601 and the return spring piece 5 are abutted against each other, and a gap of 2-5 mm is reserved between the second protrusion 602 and the return spring piece 5. The first protrusion 601 and the second protrusion 602 are used to achieve point-touch abutment, thereby improving the contact effect between the side of the return spring piece 5 and the return dial block 6, and can effectively increase the amplitude of the flexural deformation of the return spring piece 5, thereby improving the rebound performance of the return spring piece 5, and improving the rebound and reset effect of the upper cover 3.

[0060] In order to prevent the upper cover 3 from loosening when not under stress, a third protrusion 603 is fixedly provided at the end of the return block 6 away from the gear ring 2, and a stopper 101 is fixedly provided at the side of the gear ring 2 close to the upper cover 3, wherein the third protrusion 603 and the stopper 101 abut against each other, and when the upper cover 3 is not under stress, Figure 3 As shown, the third protrusion 603 and the stopper 101 abut against each other, so that the return shift block 6 and the return spring sheet 5 also abut against each other. This structure prevents the upper cover 3 from loosening in a non-stressed state.

[0061] In the above structure, the sounding plectrum 8 comprises a support 81 and a plectrum 82, wherein one end of the support 81 is fixedly arranged on the gear ring 2, and the other end is arranged between the sounding spring piece 7 and the upper cover 3, one end of the plectrum 82 is arranged on the end of the support 81 away from the gear ring 2, and the other end is used to plectrum the sounding spring piece 7 to vibrate and make sound, and the support 81 is in a Z shape, such as Figure 2 As shown, one end of the support 81 is suspended above the sounding spring 7, and the plectrum 82 is fixed on the suspended end of the support 81. In the initial state, the plectrum 82 is on one side of the sounding spring 7, and the lower end of the plectrum 82 and the end away from the sounding spring 7 are wedge-shaped. When the upper cover 3 is screwed, the plectrum 82 passes over the upper end of the sounding spring 7, and the sounding spring 7 is deformed. After the plectrum 82 passes over the sounding spring 7, the sounding spring 7 rebounds and vibrates to achieve vibration sound. When the upper cover 3 is reset, the plectrum 82 passes over the sounding spring 7 again and returns to the initial position. At this time, the sounding spring 7 makes a sound again, reminding the user that the upper cover 3 has been reset in place.

[0062] Usually, mainstream vehicle fuel tank filler caps do not have over-pressure opening protection function. When the pressure inside the fuel tank is high, there is a risk of oil and gas spraying and injuring people when opening the fuel cap. In order to solve this problem, it is necessary to ensure that the pressure inside the fuel tank is within a safe range before opening the fuel cap.

[0063] To achieve overpressure protection, the driving member 4 includes a linkage shaft 41 and a spring 42, and also includes a push rod 43 and a diaphragm 44, wherein the linkage shaft 41, the gear ring 2 and the spring 42 are coaxially arranged, the linkage shaft 41 is supported on the gear ring 2 by the elastic force of the spring 42, a sliding protrusion 401 is fixedly arranged on the side of the linkage shaft 41 close to one end of the upper cover 3, and a latch portion 402 is fixedly arranged on the other end, a slide groove 301 is arranged at a position corresponding to the sliding protrusion 401 inside the upper cover 3, the sliding protrusion 401 is slidably arranged in the slide groove 301 along the axial direction of the gear ring 2, a pin hole 201 is arranged at one end of the gear ring 2 close to the linkage shaft 41, and the latch portion 402 is inserted into the pin hole 201 along the axial direction of the gear ring 2 In the figure, a positioning protrusion 403 is provided at one end of the linkage shaft 41 away from the gear ring 2, wherein one end of the spring 42 is sleeved on the outside of the positioning protrusion 403 and abuts against the end of the linkage shaft 41 away from the gear ring 2, and the other end abuts against the side of the upper cover 3 facing the threaded seat 1, the push rod 43 and the gear ring 2 are coaxially arranged, and the push rod 43 penetrates the gear ring 2 along the axial direction of the spring 42, and an air inlet hole 102 is provided at one end of the threaded seat 1 away from the upper cover 3, the diaphragm 44 is fixedly arranged inside the threaded seat 1 and is located between the air inlet hole 102 and the gear ring 2, one end of the push rod 43 abuts against the end of the diaphragm 44 away from the air inlet hole 102, and the other end abuts against the end of the linkage shaft 41 away from the spring 42.

[0064] When the fuel tank is over-pressurized, Figure 1 As shown, the oil and gas in the oil tank enter the threaded seat 1 from the air inlet 102 and lift the diaphragm 44 upward, the diaphragm 44 pushes the push rod 43 to move upward, and the push rod 43 pushes the linkage shaft 41 to move upward, so that the latch part 402 moves out of the pin hole 201. At this time, when the upper cover 3 is screwed, the upper cover 3 can only idle and cannot drive the threaded seat 1 to rotate, thereby achieving overpressure protection.

[0065] When the fuel tank cap needs to be forcibly opened due to overpressure again, in order to facilitate manual unlocking, an unlocking hole 302 is provided along the axial direction of the ring gear 2 at the position of the upper cover 3 corresponding to the spring 42, and a dust plug is embedded on the inner side of the unlocking hole 302. After removing the dust plug, use a long-rod tool to poke the positioning protrusion 403 toward the fuel tank port so that the latch part 402 is forcibly inserted into the pin hole 201. At this time, the upper cover 3 can be screwed to remove the fuel tank cap. The dust plug is made of PC+ABS, and the outer surface is electroplated.

[0066] In addition, a fuel tank filling cap of the utility model also includes a gear ring 9, wherein the gear ring 9 is sleeved between the gear ring 2 and the threaded seat 1, the gear ring 9 and the gear ring 2 are rotatably connected, the gear ring 9 and the threaded seat 1 are fixedly connected, the side of the gear ring 9 is provided with teeth 901, and the inner side wall of the threaded seat 1 is provided with tooth grooves 103, and the gear ring 9 is used to protect the threaded seat 1, prevent the gear ring 2 from wearing the threaded seat 1, and increase the service life of the threaded seat 1.

[0067] The method of using the fuel tank refueling cap of the utility model is as follows:

[0068] When installing the fuel tank cap, hold the upper cover 3 and screw the threaded seat 1 onto the fuel tank opening. When screwing, hold the upper cover 3 and screw it. During the screwing process, the return dial block 6 presses the return spring piece 5 to bend and deform to drive the threaded seat 1 to be screwed onto the fuel tank opening. When tightened, the sounding dial block 8 drives the sounding spring piece 7 to emit a crisp "click" sound, reminding the user that it has been tightened through the sound, and the screwing of the upper cover 3 can be stopped at this time.

[0069] When removing the fuel tank cap, under normal pressure, the latch portion 402 is inserted into the pin hole 201 under the elastic force of the spring 42. At this time, the upper cover 3 can be screwed to remove the threaded seat 1 from the fuel tank port. When overpressure occurs, the latch portion 402 escapes from the pin hole 201. At this time, the upper cover 3 is idling when being screwed, and the threaded seat 1 cannot be removed from the fuel tank port. When forced removal is required, after removing the dust plug, use a long-rod tool to poke the positioning protrusion 403 toward the fuel tank port, so that the latch portion 402 is forcibly inserted into the pin hole 201. At this time, the upper cover 3 can be screwed to remove the fuel tank cap.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fuel tank filler cap, comprising a threaded seat (1), a gear ring (2), an upper cover (3) and a driving member (4), wherein: The interior of the threaded seat (1) is hollow, and the gear ring (2) is sleeved on the inner side of the threaded seat (1); The upper cover (3) is sleeved on the outer side of one end of the threaded seat (1) and is rotatably connected; The driving member (4) is arranged between the upper cover (3) and the gear ring (2), and the upper cover (3) drives the gear ring (2) to rotate along the circumference of the gear ring (2) on the inner side of the threaded seat (1) through the driving member (4); The invention is characterized in that it also includes a return spring piece (5), a return dial block (6), a sound-generating spring piece (7) and a sound-generating dial block (8), wherein: There are a plurality of return springs (5) arranged in a circumferential annular array along the gear ring (2), one end of each of the return springs (5) being fixedly arranged on one end of the threaded seat (1) close to the upper cover (3), and the other end extending in the radial direction of the gear ring (2) and in the direction of the gear ring (2); The return block (6) is provided on one side of each return spring sheet (5), one end of the return block (6) selectively abuts against one end of the corresponding return spring sheet (5), and the other end is fixedly provided on the side of the gear ring (2) close to one end of the threaded seat (1); One end of the sound-generating spring (7) is fixedly arranged on one end of the threaded seat (1) close to the upper cover (3), and the other end extends along the axial direction of the gear ring (2) and in the direction of the upper cover (3); The sounding paddle block (8) is arranged on one side of the sounding spring piece (7), one end of the sounding paddle block (8) is fixedly arranged on one end of the gear ring (2) close to the upper cover (3), and the other end extends along the axial direction of the gear ring (2) and in the direction of the threaded seat (1), and is used to paddle the sounding spring piece (7) to vibrate and produce sound.

2. The fuel tank cap of claim 1, characterized in that: A first protrusion (601) and a second protrusion (602) are fixedly provided on one side of the return block (6) close to the return spring sheet (5), wherein: The first protrusion (601) and the return spring sheet (5) are in contact with each other; A gap of 2-5 mm is reserved between the second protrusion (602) and the return spring (5).

3. A fuel tank filler cap as claimed in claim 2, characterized in that: A third protrusion (603) is fixedly provided on one end of the return block (6) away from the gear ring (2), and a stopper (101) is fixedly provided on the side of the gear ring (2) close to one end of the upper cover (3), wherein: The third protrusion (603) and the stopper (101) are in abutment with each other.

4. A fuel tank filler cap as claimed in claim 3, characterized in that: The sounding plectrum (8) comprises a support (81) and a plectrum (82), wherein: One end of the support (81) is fixedly arranged on the gear ring (2), and the other end is arranged between the sound-generating spring (7) and the upper cover (3); One end of the plectrum (82) is arranged on an end of the support (81) away from the gear ring (2), and the other end is used to poke the sound-generating spring (7) to vibrate and generate sound.

5. A fuel tank filler cap as claimed in claim 4, characterized in that: The driving member (4) comprises a linkage shaft (41) and a spring (42), wherein: The linkage shaft (41), the gear ring (2) and the spring (42) are coaxially arranged, and the linkage shaft (41) is supported on the gear ring (2) by the elastic force of the spring (42); A sliding protrusion (401) is fixedly provided on the side of the linkage shaft (41) close to one end of the upper cover (3), and a latch portion (402) is fixedly provided on the other end; A sliding groove (301) is provided inside the upper cover (3) at a position corresponding to the sliding protrusion (401), and the sliding protrusion (401) is slidably arranged in the sliding groove (301) along the axial direction of the gear ring (2); A pin hole (201) is provided at one end of the gear ring (2) close to the linkage shaft (41), and the latch portion (402) is inserted into the pin hole (201) along the axial direction of the gear ring (2).

6. A fuel tank filler cap as claimed in claim 5, characterized in that: A positioning protrusion (403) is provided at one end of the linkage shaft (41) away from the gear ring (2), wherein: One end of the spring (42) is sleeved on the outside of the positioning protrusion (403) and abuts against one end of the linkage shaft (41) away from the gear ring (2), and the other end abuts against a side of the upper cover (3) facing the threaded seat (1).

7. A fuel tank filler cap as claimed in claim 6, characterized in that: The driving member (4) further comprises a top rod (43) and a diaphragm (44), wherein: The push rod (43) and the gear ring (2) are coaxially arranged, and the push rod (43) penetrates the gear ring (2) along the axial direction of the spring (42); An air inlet hole (102) is provided at one end of the threaded seat (1) away from the upper cover (3); The diaphragm (44) is fixedly arranged inside the threaded seat (1) and between the air inlet hole (102) and the gear ring (2); One end of the push rod (43) abuts against an end of the diaphragm (44) away from the air inlet (102), and the other end abuts against an end of the linkage shaft (41) away from the spring (42).

8. The fuel tank filler cap according to claim 7, characterized in that: An unlocking hole (302) is provided on the upper cover (3) at a position corresponding to the spring (42) and extending through the axial direction of the gear ring (2), and a dust plug is embedded inside the unlocking hole (302).

9. A fuel tank filler cap as claimed in claim 1 or 8, characterized in that: Also included is a gear ring (9), wherein: The gear ring (9) is sleeved between the gear ring (2) and the threaded seat (1); the gear ring (9) and the gear ring (2) are rotationally connected; and the gear ring (9) and the threaded seat (1) are fixedly connected.

10. A fuel tank filler cap as claimed in claim 9, characterized in that: The side of the gear ring (9) is provided with teeth (901), and the inner side wall of the threaded seat (1) is provided with tooth grooves (103), wherein: The teeth (901) are meshed in the tooth grooves (103).

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