TWI598253B - Lock cover of fuel tank - Google Patents

Description

Fuel tank lock cover

The present invention relates to a fuel tank lock cover, and more particularly to a fuel tank lock cover for sealing a fuel tank opening.

Where a locomotive, a car, a yacht or a pumping motor is provided with a fuel tank, a fuel tank lock cover is provided at the opening of the fuel tank, and the fuel tank lock cover is used to close the fuel tank opening so that the fuel in the fuel tank or the foreign matter outside the fuel tank cannot be Easy access to the tank.

However, the pressure inside the tank will vary depending on the environment in which the tank is located. For example, after the vehicle is parked in the hot sun for a period of time, the fuel tank will increase the internal pressure due to the temperature rise; or when the vehicle is running, the fuel tank will generate a negative pressure due to the internal fuel gradually decreasing, and the negative pressure will cause the inside of the fuel tank. Suction is generated so that the fuel does not easily flow to the engine, resulting in a problem that the engine does not supply oil smoothly.

To this end, there is a conventional fuel tank lock cover that can adjust the pressure of the fuel tank. The conventional fuel tank lock cover has a body fixed at the opening of the fuel tank, and an oil cover pivotally mounted on the seat body. An oil chamber is provided with an alcove, and a mounting space is arranged in the recessed chamber. The mounting space is provided with a first valve pressed by a first spring and a second valve pressed by a second spring. An embodiment similar to the conventional fuel tank lock cover has been disclosed in the Patent Case No. I451987 of the Republic of China on "Locking Device for Fuel Tanks".

According to this, when the suction force is generated by the negative pressure in the oil tank, the suction force will drive the first valve to displace, so that the air outside the oil cover can flow into the oil tank to balance the pressure; or, when When the thrust is generated by the positive pressure in the fuel tank, the thrust can simultaneously drive the displacement of the first valve and the second valve, so that the oil and gas in the oil tank can be dissipated outside the oil cover. Wherein, when the pressure in the oil tank is different from the external pressure, the first valve and the second valve are tightly sealed, so that the fuel in the oil tank is not leaked, and foreign matter in the outside cannot enter the oil tank.

However, the conventional fuel tank lock cover structure is too complicated, which not only causes problems such as high manufacturing cost and inconvenient assembly, but more importantly, the ventilating structure is formed by a plurality of members, so that when any of the ventilating structures is blocked or When it is damaged, the engineering will be dismantled and tested one by one, which will cause the operators to be almost unwilling to perform. Instead, the user will be required to replace the old fuel tank lock cover and purchase a new fuel tank lock cover for replacement. The maintenance cost is too high, causing a heavy burden on the user.

In view of this, the conventional fuel tank lock cover does have a need for improvement.

In order to solve the above problems, the present invention provides a fuel tank lock cover, which is provided only with a gas passage that can communicate with the outside, and the remaining ventilation structures are concentrated in the ventilation module, and the ventilation module is only combined with a simple structure. Cover the lid for quick assembly and repair.

The following directional terms are used in the present invention, such as "before", "after", "left", "right", "upper (top)", "lower", "inside", "outside", The singularity of the present invention is intended to be illustrative only and not to limit the invention.

The fuel tank lock cover of the present invention comprises: a base; a cover, the cover is pivotally connected to the base, the cover is provided with a first joint and communicates from the first joint to the outside of the cover a gas passage; and a ventilation module, the ventilation module comprising a body, a cover and a communication control assembly, the base body is provided with a second joint portion coupled to the first joint portion, the seat body having an accommodation a space through which the second hole is connected to communicate with the accommodating space and the gas passage; the cover plate is provided with at least one through hole, and the cover plate is coupled to the seat body to limit the communication control component to the accommodating In the space, and the communication control unit controls the communication state between the through hole and the gas passage, the communication control assembly has a partition member, and the partition member is provided with at least one through hole, and an elastic member pushes the partition toward the cover plate And a shielding member is coupled to the partitioning member, and the shielding member is elastically deformed by being pushed by the airflow to shield or not shield the perforation of the partitioning member.

Accordingly, the fuel tank lock cover of the present invention only provides a gas passage that can communicate with the outside of the cover, and the remaining ventilation structures are concentrated in the ventilation module, and the ventilation module is combined with the cover only by a simple structure. Therefore, the fuel tank lock cover of the present invention can be assembled quickly, and when the ventilation effect is not good, the ventilation module can be quickly repaired by replacing the ventilation module, and the entire fuel tank lock cover can be replaced. Therefore, the fuel tank lock cover of the present invention can greatly reduce the maintenance cost, reduce the burden on the user, and is also convenient for the maintenance of the operator.

Wherein, the shielding member has an opposite bonding surface and a curved surface, and the minimum distance between the bonding surface and the curved surface decreases from the center to the periphery; the portion of the shielding member having a thinner thickness is more susceptible to stress. The bending deformation has the effect of improving the accuracy of regulating the internal pressure of the fuel tank.

Wherein, the shielding member has a latching portion protruding from the engaging surface, the blocking member is coupled to the partitioning member by the latching portion, and the through hole of the partitioning member is shielded by the engaging surface; The ease of assembly and the like.

Wherein, the partition comprises a cup portion, a ring lip and an extension ring wall, the perforation of the partition member is disposed on the cup portion, and the ring lip is connected to an outer periphery of the opening of the cup portion, and the extension ring wall is connected to the ring lip And extending away from the cover plate to form a pocket between the cup portion, the ring lip and the extension ring wall, the elastic member is received in the pocket and sleeved on the outer circumference of the cup portion; The effect of the elastic member pushing against the stability of the partition member is improved.

The inner body has an inner surface and an outer surface, the inner surface encircles the accommodating space, and the second joint portion is disposed on the outer surface; the two ends of the elastic member respectively abut the inner portion of the seat body The surface and the ring lip of the partition member; and the effect of improving the stability of the elastic member against the partition member.

Wherein, a gasket is disposed between the partition member and the cover plate, and the partition member is indirectly abutted against the cover plate by the elastic gasket; and has the effects of improving airtightness and the like.

Wherein, the first joint portion has an internal thread structure, and the second joint portion has a matching external thread structure; and has the effects of improving assembly convenience and the like.

The cover is divided into an inner block and an outer block, the first joint is disposed at a bottom end of the inner block, and a top end of the inner block is provided with an abutting flange and a plurality of grooves. The abutting flange is disposed at an outer circumference of the top end of the first joint portion, the top edge of the plurality of grooves is lower than the abutting flange, and at least one groove extends to communicate with the side edge of the inner block The outer block is coupled to the top end of the inner block, and the bottom surface of the outer block abuts the abutting flange without abutting the top edge of the plurality of grooves; the inner block and the outer block are common The gas passage is formed; the utility model has the advantages of improving manufacturing and assembly convenience.

Wherein, the through hole is formed in a flared shape adjacent to the accommodating space; and has the effects of improving the smoothness of the gas flow and the like.

1‧‧‧Base

11‧‧‧ pivotal department

2‧‧‧掀盖

2a‧‧‧ inner block

2b‧‧‧outer blocks

21‧‧‧ pivoting department

22‧‧‧ card slot

23‧‧‧First joint

24‧‧‧ gas passage

25‧‧‧Abutment flange

26‧‧‧ Groove

27‧‧‧Seal

28‧‧‧Reinforcement

3‧‧‧ventilation module

31‧‧‧

31a‧‧‧ inner surface

31b‧‧‧ outer surface

311‧‧‧Second joint

312‧‧‧Tongkong

32‧‧‧ Cover

321‧‧‧through hole

33‧‧‧Connected control components

331‧‧‧Parts

331a‧‧‧ Cup

331b‧‧‧ lip

331c‧‧‧Extension ring wall

3311‧‧‧Perforation

3312‧‧‧ Groove

332‧‧‧Flexible parts

333‧‧‧ Shield

334‧‧‧Top support

335‧‧‧shims

336‧‧‧Bucks

4‧‧‧Trolley device

41‧‧‧Card holders

5‧‧‧ Ventilation module

51‧‧‧ body

51a‧‧‧ inner surface

51b‧‧‧ outer surface

511‧‧‧Second joint

512‧‧‧through holes

52‧‧‧ Cover

521‧‧‧through hole

53‧‧‧Connected control components

531‧‧‧Parts

531a‧‧‧ Cup

531b‧‧‧Extension ring wall

5311‧‧‧Perforation

5312‧‧‧ ring lip

5313‧‧‧ Groove

532‧‧‧Flexible parts

533‧‧‧ Shield

5331‧‧‧Fitting surface

5332‧‧‧ curved surface

5333‧‧Card Department

534‧‧‧shims

S‧‧‧ accommodating space

Fig. 1 is a perspective exploded perspective view showing a first embodiment of the present invention.

Fig. 2 is a side sectional view showing the first embodiment of the present invention.

Fig. 3 is a perspective exploded perspective view showing the flip cover of the first embodiment of the present invention.

Fig. 4 is a perspective exploded perspective view showing the ventilating module of the first embodiment of the present invention.

Fig. 5 is a partially enlarged side sectional view showing the first embodiment of the present invention.

Fig. 6 is a schematic view showing the implementation of the first embodiment of the present invention for supplying airflow into the fuel tank.

Figure 7 is a schematic view showing the implementation of the first embodiment of the present invention for the flow of air out of the fuel tank.

Fig. 8 is a partially enlarged side sectional structural view showing a second embodiment of the present invention.

Fig. 9 is a perspective exploded perspective view showing a ventilating module according to a second embodiment of the present invention.

Fig. 10 is a view showing the implementation of the second embodiment of the present invention for supplying airflow into the fuel tank.

Figure 11 is a schematic view showing the implementation of the second embodiment of the present invention for the flow of air out of the fuel tank.

The above and other objects, features and advantages of the present invention will become more <RTIgt; In the first embodiment of the fuel tank lock cover of the present invention, the fuel tank lock cover substantially includes a base 1, a cover 2 and a ventilation module 3. The cover 2 is pivotally connected to the base 1. The ventilation module 3 The cover 2 can be quickly and disassembled.

Referring to Figures 1 and 2, the base 1 has a hollow tubular shape and is sleeved and positioned at a tank opening. The base 1 can be provided with a pivoting portion 11 for pivoting the cover 2 . The outer peripheral wall of the base 1 can also be provided with a pull rod device 4 having a holding member 41 extending through the base 1. The pull rod device 4 can control the diameter of the holding member 41 along the base 1. Displacement is generated to control whether the holding member 41 is locked to the cover 2 or not, thereby controlling the cover 2 to maintain the closed state (as shown in FIG. 3) or to pivot relative to the base 1 Turning it apart (as shown in Fig. 1); wherein the detailed structure of the tie rod device 4 is understood by those of ordinary skill in the art and will not be described in detail herein.

The cover 2 can be provided with a pivoting portion 21 for pivoting the pivoting portion 11 of the base 1 and a latching slot 22 for latching the latching member 41 of the pull rod device 4; The lever device 4 is touched, and the latching member 41 is controlled to be withdrawn from the latching slot 22, so that the flap 2 can be turned over relative to the base 1 to leave the opening of the fuel tank, so that the cover 2 can be removed without removing the cover 2 Replenishing the fuel tank helps to improve the convenience of operation.

Moreover, the cover 2 is provided with a first joint portion 23 for assembling and connecting the ventilating module 3; when the flip cover 2 is closed to the tank opening, the first joint portion 23 is opposed to the inside of the tank opening. The first joint portion 23 can be, for example, a removable structure such as a cassette or a screw joint; for example, without limitation, the first joint portion 23 can be selected as a kit having an internal thread structure, and the kit can be combined and fixed. The cover 2 is provided for the ventilation module 3 or a screw to be screwed.

The cover 2 is further provided with a gas passage 24, one end of the gas passage 24 is connected to the first joint portion 23, and the other end is connected to the outside of the cover 2, so that outside air can flow into the oil tank or in the oil tank. The oil and gas can be released to the outside world in order to balance the internal pressure of the tank.

For example, referring to FIGS. 2 and 3, the present embodiment selects the cover 2 into an inner block 2a and an outer block 2b. The first joint portion 23 is disposed at the bottom of the inner block 2a. The end of the inner block 2a is provided with an abutting flange 25 and a plurality of recesses 26. The abutting flanges 25 are disposed on the outer periphery of the top end of the first engaging portion 23, and the plurality of recesses 26 The top edge is lower than the abutment flange 25 and at least one groove 26 extends into communication with the side edge of the inner block 2a. The outer block 2b is assembled and coupled to the top end of the inner block 2a, and the bottom surface of the outer block 2b abuts against the abutting flange 25 without abutting against the top edge of the plurality of grooves 26. Accordingly, the inner block 2a and the outer block 2b can together form the gas passage 24, so that outside air can flow from the side edge of the inner block 2a through the plurality of grooves 26 into the first joint portion 23. And passing through the venting module 3 to flow into the oil tank; or the oil and gas in the oil tank can flow from the venting module 3 through the first joint portion 23 into the plurality of grooves 26, and then guided to flow into the inner portion The side edge of the block 2a is vented to the outside.

The cover 2 is further provided with a sealing member 27 and a reinforcing member 28. The sealing member 27 can be made of an elastic material such as rubber. The sealing member 27 is coupled to the outer periphery of the first engaging portion 23 and is annularly outward. Extending to accommodate the reinforcement member 28. The reinforcement member 28 can be, for example, an annular hard plate having a predetermined thickness to enhance the ability of the seal member 27 to withstand axial forces. Accordingly, when the lid 2 is in the closed state, the lid 2 can be closely abutted against the periphery of the tank opening by the sealing member 27.

Referring to Figures 4 and 5, the venting module 3 includes a body 31 having an opposite inner surface 31a and an outer surface 31b. The inner surface 31a encloses an accommodating space S. The surface 31b is provided with a second engaging portion 311 for coupling to the first engaging portion 23 of the flip cover 2; this embodiment selects the second engaging portion 311 to have an external thread structure matching the first engaging portion 23, To improve the ease of assembly between the two. Consistent hole 312 runs through the first The two engaging portions 311 are connected to the accommodating space S and the outside of the pedestal 31, so that the accommodating space S can communicate with the gas passage 24 through the through hole 312. The through hole 312 is adjacent to the accommodating space S. It is preferably provided with a flared shape to improve the smoothness of gas flow.

The venting module 3 further includes a cover plate 32 and a communication control component 33. The cover plate 32 is coupled to the base body 31 for limiting the communication control component 33 to the accommodating space S. An external thread is provided on the circumferential surface of the cover plate 32, and a matching internal thread is provided on the seat body 31 to allow the cover plate 32 to be firmly coupled to the base body 31. The cover plate 32 faces the inside of the oil tank, and the cover plate 32 is provided with at least one through hole 321 penetrating through; thus, the state of the communication control component 33 can be controlled by the gas pressure inside the fuel tank through the through hole 321 The space S can be timely connected to the inside of the tank to balance the pressure.

In detail, the communication control unit 33 has a partitioning member 331. The partitioning member 331 is provided with at least one through hole 3311. The elastic member 332 is pushed against the partitioning member 331. The shielding member 333 is provided. Between the partition member 331 and the cover plate 32, a top support member 334 is pushed against the partition member 333 toward the partition member 333. According to this, when the gas pressure inside the oil tank is balanced with the gas pressure in the accommodating space S (ie, the outside air pressure), the partition member 331 can directly or indirectly connect the cover plate 32 without air gap, and the occlusion member 333 can shield the through hole 3311 of the partition member 331 so that the oil and gas inside the oil tank does not overflow to the outside; the state of the pressure imbalance will be described in detail later.

In this embodiment, the partitioning member 331 can include a cup portion 331a, a ring lip 331b, and an extending ring wall 331c. The through hole 3311 of the partitioning member 331 is disposed on the cup portion 331a and opposite to the opening of the cup portion 331a. The opening of the cup portion 331a faces the cover plate 32 for receiving the shielding member 333 and the top support member 334. The ring lip 331b is connected to the outer periphery of the opening of the cup portion 331a. The extension ring wall 331c is connected to the ring lip 331b and extends away from the cover plate 32 for the cup portion 331a and the ring lip 331b. A cavity 3312 is formed between the extension ring walls 331c. The elastic member 332 can be received in the cavity 3312 and sleeved on the outer circumference of the cup portion 331a. It helps to improve the stability of the elastic member 332 against the partition member 331.

The two ends of the elastic member 332 can respectively abut the inner surface 31a of the seat body 31 and the ring lip 331b of the partition member 331 respectively, so as to push against the partition member 331 to directly or indirectly abut the cover plate 32. . Preferably, a spacer 335 is disposed between the spacer 331 and the cover 32, so that the spacer 331 and the cover 32 can be indirectly abutted by the elastic spacer 335 to improve airtightness. .

In addition, when the shielding member 333 is also made of a material having elasticity, the shielding member 333 preferably has a rigid buckle 336 coupled to the surface of the cover 32, and the supporting member 334 extends through the spacer. 335, and the two ends of the top support member 334 respectively abut the cover plate 32 and the buckle piece 336, thereby improving the stability of the top support member 334 against the shielding member 333.

Referring to FIG. 6, according to the foregoing structure, when the gas pressure inside the oil tank is less than the gas pressure in the accommodating space S by a predetermined value, the negative pressure in the oil tank will generate suction and pass through the through hole of the cover plate 32. 321 attracts the buckle 336 and the shutter 333 compresses the top support 334. In this way, the shielding member 333 can temporarily block the through hole 3311 of the partitioning member 331 so that the outside air can pass through the gas passage 24 of the cover 2, the through hole 312 of the ventilation module 3, the receiving space S, The through hole 3311 and the through hole 321 flow into the oil tank, thereby balancing the aforementioned air pressure difference and returning to the equilibrium state as shown in FIG.

Referring to FIG. 7, on the contrary, when the gas pressure inside the oil tank is greater than the gas pressure in the accommodating space S by a predetermined value, the positive pressure in the oil tank will generate thrust and pass through the through hole 321 of the cover plate 32. The buckle 336, the shutter 333 and the partition 331 are pushed to compress the elastic member 332. In this way, the partition member 331 can temporarily leave the gasket 335, so that the oil and gas inside the fuel tank can sequentially pass through the through hole 321 of the ventilating module 3, the accommodating space S, the through hole 312, and the gas of the sill cover 2. The passage 24 is discharged to the outside, thereby balancing the aforementioned air pressure difference and returning to the equilibrium state as shown in Fig. 5.

Please refer to FIG. 8, which discloses a part of the second embodiment of the fuel tank lock cover of the present invention. The second embodiment of the present invention is substantially the same as the first embodiment described above, and the main difference is that the second embodiment of the present invention provides a ventilating module 5 having a simpler structure.

In detail, please refer to FIG. 8 and FIG. 9 , the ventilation module 5 includes a body 51 , a cover 52 and a communication control component 53 . The communication control component 53 has a partition 531 and an elastic member 532 . a shutter member 533 and a spacer 534, wherein the seat body 51, the cover plate 52, the partition member 531, the elastic member 532, and the spacer 534 and the like have a detailed structure corresponding to the first embodiment. The components are the same or similar and will not be described in detail here. The present embodiment is characterized in that the shielding member 533 is assembled and coupled to the partitioning member 531, and the shielding member 533 can be elastically deformed by the airflow to shield or not shield the through hole 5311 of the partitioning member 531. It is not necessary to provide the members such as the top support member 334 and the buckle piece 336 of the first embodiment (indicated in FIG. 4), which helps to reduce the manufacturing cost of the ventilation module 5 and improve the convenience of assembling the ventilation module 5. Sex and efficiency.

For example, but not limited to, the shielding member 533 of the embodiment may have a matching surface 5331 and a curved surface 5332, and the minimum distance between the bonding surface 5331 and the curved surface 5332 is gradually decreased from the center to the periphery. The portion where the thickness of the shutter 533 is thin is more susceptible to bending deformation when subjected to force. Further, the shielding member 533 further has a latching portion 5333 protruding from the engaging surface 5331. The latching portion 5333 can be disposed at a portion where the thickness of the blocking member 533 is the largest, so as to be engaged by the latching portion 5333. The partitioning member 531 and the perforation 5311 of the partitioning member 531 are shielded by the bonding surface 5331 in a state where the pressure is balanced on both sides.

Referring to FIG. 10, according to the foregoing structure, when the gas pressure inside the oil tank is less than the gas pressure in the accommodating space S by a predetermined value, the negative pressure in the oil tank will generate suction and pass through the through hole of the cover 52. The 521 is attracted to the shielding member 533. At this time, the thin portion of the shielding member 533 is easily bent downward, so that the through hole 5311 of the partitioning member 531 is temporarily not shielded by the bonding surface 5331 of the shielding member 533. In this way, the external gas can sequentially pass through the gas passage 24 of the cover 2, the through hole 512 of the ventilation module 5, the accommodating space S, the through hole 5311, and the The through hole 521 flows into the oil tank, thereby balancing the aforementioned air pressure difference and returning to the equilibrium state as shown in FIG.

Referring to FIG. 11, on the contrary, when the gas pressure inside the oil tank is greater than the gas pressure in the accommodating space S by a predetermined value, the positive pressure in the oil tank will generate thrust and pass through the through hole 521 of the cover 52. The shutter 533 and the partition 531 are pushed to compress the elastic member 532. In this manner, the spacer 531 can temporarily leave the spacer 534, so that the oil and gas inside the fuel tank can sequentially pass through the through hole 521 of the ventilating module 5, the accommodating space S, the through hole 512, and the gas of the sill cover 2. The passage 24 is discharged to the outside, thereby balancing the aforementioned air pressure difference and returning to the equilibrium state as shown in Fig. 8.

In summary, the fuel tank lock cover of the present invention only provides a gas passage that can communicate with the outside of the cover, and the remaining ventilation structures are concentrated in the ventilation module, and the ventilation module is combined with the simple structure only. The cover, so the fuel tank lock cover of the invention can be assembled quickly, and when the ventilation effect is not good, the ventilation module can be quickly repaired by replacing the ventilation module, and the entire fuel tank lock cover can be replaced. Therefore, the fuel tank lock cover of the present invention can greatly reduce the maintenance cost, reduce the burden on the user, and is also convenient for the maintenance of the operator.

It is worth mentioning that the relevant components used to balance the pressure inside and outside the fuel tank are more likely to be damaged or have a short service life, and most of them are components that move or are compressed, so the gas passage provided in the clamshell is almost There is no damage to the situation; therefore, the fuel tank lock cover of the present invention concentrates the components with short service life together, and can quickly disassemble the quick set for modular replacement, which is an important effect of the invention. one. On the other hand, if the user's maintenance budget is insufficient, or the new ventilation module is temporarily out of stock, the ventilation module that can be replaced can be removed, and the screw is directly screwed to the joint of the cover. In order to close one end of the gas passage, the fuel tank lock cover of the present invention temporarily loses the function of balancing the pressure of the fuel tank; after that, the screw can be disassembled and replaced with a new ventilation module to restore the pressure of the balance tank. The utility of the invention is excellent.

Although the present invention has been disclosed using the above preferred embodiments, it is not intended to be limiting The present invention is not limited to the spirit and scope of the present invention, and various modifications and changes to the above embodiments are still within the technical scope of the present invention. Therefore, the scope of protection of the present invention is attached. The scope defined in the scope of application for patent application shall prevail.

1‧‧‧Base

11‧‧‧ pivotal department

2‧‧‧掀盖

2a‧‧‧ inner block

2b‧‧‧outer blocks

21‧‧‧ pivoting department

22‧‧‧ card slot

23‧‧‧First joint

24‧‧‧ gas passage

27‧‧‧Seal

3‧‧‧ventilation module

31‧‧‧

311‧‧‧Second joint

32‧‧‧ Cover

321‧‧‧through hole

4‧‧‧Trolley device

41‧‧‧Card holders

Claims (9)

A fuel tank lock cover comprising: a base; a cover pivotally connected to the base, the cover being provided with a first joint and a gas communicating from the first joint to the outside of the cover And a ventilation module, the ventilation module includes a body, a cover plate and a communication control component, the base body is provided with a second joint portion coupled to the first joint portion, the seat body has an accommodation space. a continuous hole penetrating the second joint portion to communicate the accommodating space and the gas passage; the cover plate is provided with at least one through hole, the cover plate is coupled to the seat body to limit the communication control component to the accommodating space, And controlling, by the communication control component, the communication state between the through hole and the gas passage, the communication control assembly has a partitioning member, the partitioning member is provided with at least one through hole, and an elastic member is pushed against the partitioning member toward the cover plate, The shielding member is coupled to the partitioning member, and the shielding member is elastically deformed by the airflow to shield or not shield the perforation of the partitioning member. The fuel tank lock cover according to claim 1, wherein the shielding member has a matching abutting surface and a curved surface, and the minimum distance between the bonding surface and the curved surface decreases from the center to the periphery. . The fuel tank lock cover of claim 2, wherein the shutter has a latching portion protruding from the engaging surface, the shutter member being coupled to the partitioning member by the latching portion, and The mating face shields the perforations of the partition. The fuel tank lock cover of claim 2, wherein the partition member comprises a cup portion, a ring lip and an extension ring wall, the perforation of the partition member is disposed on the cup portion, and the ring lip is connected thereto An outer peripheral edge of the opening of the cup portion, the extension ring wall is connected to the ring lip and extends away from the cover plate to form a cavity between the cup portion, the ring lip and the extension ring wall, the elastic member It is placed in the pocket and fits over the outer circumference of the cup. The fuel tank lock cover according to claim 3, wherein the seat body has an inner surface And an outer surface, the inner surface enclosing the accommodating space, the second joint portion is disposed on the outer surface; the two ends of the elastic member respectively abut the inner surface of the seat body and the ring lip of the partition member. The fuel tank cap of claim 2, wherein a gasket is disposed between the partition and the cover, and the partition is indirectly abutted by the gasket having elasticity. The fuel tank lock cap of any one of claims 1 to 3, wherein the first joint portion has an internal thread structure and the second joint portion has a mating external thread structure. The fuel tank lock cover according to any one of claims 1 to 3, wherein the cover is divided into an inner block and an outer block, and the first joint is disposed at the bottom of the inner block The top end of the inner block is provided with an abutting flange and a plurality of grooves. The abutting flange is disposed at an outer periphery of the top end of the first joint portion, and the top edge of the plurality of grooves is lower than the edge Connecting the flange, and at least one groove extends to communicate with the side edge of the inner block; the outer block is coupled to the top end of the inner block, and the bottom surface of the outer block abuts against the abutting flange a top edge of the plurality of grooves; the inner block and the outer block together form the gas passage. The fuel tank lock cap according to any one of claims 1 to 3, wherein the through hole is formed in a flared shape adjacent to the accommodating space.