CN214492528U

CN214492528U - Fuel tank cap and fuel tank thereof

Info

Publication number: CN214492528U
Application number: CN202022477330.3U
Authority: CN
Inventors: 李浩新; 刘海涛
Original assignee: John Deere Tianjin Co Ltd
Current assignee: John Deere Tianjin Co Ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-10-26
Anticipated expiration: 2030-10-30

Abstract

The utility model discloses a fuel tank cap and fuel tank thereof, wherein, fuel tank cap includes: an outer cover; an inner cover; the inner cover is provided with a limiting part; a rotating shaft rotating around a rotating axis; the outer cover and the inner cover are sleeved outside the rotating shaft; an operating component which is arranged outside the outer cover and used for receiving force application to drive the rotating shaft to rotate; the operating member and the rotating shaft rotate to form a locking position and an unlocking position; the joint component is arranged outside the rotating shaft and is used for being matched with the limiting part, and the joint component can be driven by the rotation of the rotating shaft to act to form a limiting joint position with the limiting part and a limiting release position with the limiting part for releasing the rotation limiting; wherein the inner cap is rotatable with the outer cap in at least one direction about the axis of rotation when the operating member is in the locked position; the engagement member is in the limit release position, and the outer cap is independently rotatable about the axis of rotation relative to the inner cap.

Description

Fuel tank cap and fuel tank thereof

Technical Field

The utility model relates to a fuel tank cap and fuel tank thereof.

Background

The fuel tank of the engineering machinery is usually provided with a fuel tank cover, but because the capacity of the fuel tank of the engineering machinery is large, the anti-theft design is usually required for the fuel tank cover, the existing fuel tank cover is usually in a split type design of an inner cover and an outer cover, the sealing of a fuel filling opening of the fuel tank is realized by the inner cover, the inner cover is covered and hidden by the outer cover, when the fuel tank cover is arranged at the fuel filling opening of the fuel tank, the outer cover is in an independent rotating state, and the outer cover can be driven to rotate together by the outer cover only by carrying out expected operation on an operating part on the fuel tank cover, so that the opening of the fuel tank cover is realized.

However, the conventional fuel lid is very complicated in opening operation, which causes troubles in use for users.

SUMMERY OF THE UTILITY MODEL

In view of the above insufficiency, the utility model discloses an aim at provide a fuel tank cap and fuel tank thereof to can convenience of customers opens the fuel tank cap.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a fuel tank cap comprising:

an outer cover;

an inner cap disposed inside the outer cap; the inner cover is provided with a limiting part;

a rotating shaft rotatable about a rotation axis; the outer cover and the inner cover are sleeved outside the rotating shaft;

an operating component which is arranged outside the outer cover and used for receiving force application to drive the rotating shaft to rotate; the operating member and the rotating shaft rotate to form a locking position and an unlocking position;

the joint component is arranged outside the rotating shaft and is used for being matched with the limiting part; the joint component can be driven by the rotation of the rotating shaft to act to form a limit joint position with the limit part and a limit release position with the limit part for releasing the rotation limit;

wherein when the operating member is in the locked position, the engagement member is in the limit engagement position and the inner cap is rotatable with the outer cap in at least one direction about the axis of rotation; when the operating member is in the unlocking position, the engaging member is in the limit releasing position, and the outer cap is independently rotatable about the rotation axis relative to the inner cap.

In a preferred embodiment, the engagement member is driven by rotation of the shaft to expand and contract in the radial direction.

As a preferred embodiment, the outer cover is provided with an inner tube sleeved outside the rotating shaft; the side wall of the inner tube has a lateral opening; the engagement member protrudes from the lateral opening during rotation of the operating member from the unlocked position to the locked position.

As a preferred embodiment, the engagement member includes a sliding joint; the sliding joint comprises a ring part sleeved between the rotating shaft and the inner pipe and an embedded part fixedly connected with the ring part; the insert is located in the lateral opening in the limiter release position and extends out of the lateral opening in the limiter engagement position.

As a preferred embodiment, the inner cover is provided with a cylinder body sleeved outside the inner pipe; the limiting part comprises a joint protrusion arranged on the inner wall of the barrel and attached to the outer wall of the inner tube.

As a preferred embodiment, the rotating shaft is provided with an eccentric protrusion; the ring part of the sliding joint is sleeved outside the eccentric bulge.

As a preferred embodiment, the operating member includes a handle covered on the top surface of the outer cover; the handle has a connecting end connected to the shaft extending out of the outer cover, and a positioning end operably positioned on the outer cover.

As a preferred embodiment, a locking ring is fixedly arranged on the top surface of the outer cover, and the positioning end is provided with a positioning connecting ring matched with the locking ring; when the handle is located at the unlocking position, the positioning connecting ring is communicated with the locking ring in an alignment mode.

As a preferred embodiment, the top surface of the outer cover is further provided with a limiting protrusion; the handle abuts against the limiting protrusion when located at the locking position, and one side of the handle is limited by the limiting protrusion in a rotating mode.

As a preferred embodiment, the connecting end is a connecting shifting fork connected with one end of the rotating shaft; the connecting shifting fork is provided with a first shifting fork end face and a second shifting fork end face which are positioned at two sides of the rotating shaft; the limiting bulge is provided with a first limiting side surface and a second limiting side surface along the circumferential direction;

when the handle is located at the unlocking position, the end face of the first shifting fork abuts against the first limiting side face, and one side of the handle is rotationally limited by the limiting protrusion; when the handle is located at the locking position, the end face of the second shifting fork abuts against the second limiting side face, and the other side of the handle is rotated and limited by the limiting protrusion.

A fuel tank comprising: the fuel tank cap according to any one of the above embodiments, wherein the fuel tank cap is provided at a filler opening of the fuel tank.

Has the advantages that:

when the fuel tank cap needs to be taken down from the fuel tank, a user rotates the fuel tank cap from the unlocking position to the locking position by rotating the operation member, and then rotates the outer cap, so that the inner cap is driven to take down the fuel tank cap, the opening process is simple, and the operation is convenient.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and the accompanying drawings, which specify the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the present invention are not so limited in scope.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is an exploded view of a tank cap according to an embodiment of the present invention;

FIG. 2 is a top view of the handle of FIG. 1 in a locked position;

FIG. 3 is a top view of the handle of FIG. 1 in an unlocked position;

FIG. 4 is a cross-sectional view of FIG. 1;

fig. 5 is a schematic view of the structure of the rotating shaft and the sliding joint in fig. 1.

Detailed Description

In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 5, an embodiment of the present invention provides a fuel tank cap that can be detachably attached to a filler neck of a fuel tank. The fuel tank is not limited to the fuel tank of the construction machine, and may be a fuel tank of a transportation vehicle, and of course, the fuel tank cap provided in this embodiment may also be applied to fuel tanks of other vehicles.

In this embodiment, the tank cap includes: an outer cover 5; an inner lid 15; a rotating shaft 10 rotating around a rotating axis; the operating component 2 is arranged outside the outer cover 5 and used for receiving force application to drive the rotating shaft 10 to rotate; and the joint component 11 is arranged outside the rotating shaft 10 and is used for being matched with the limiting part.

Wherein, the inner cover 15 is provided with a limiting part. The outer cover 5 and the inner cover 15 are sleeved outside the rotating shaft 10. The operating member 2 rotates with the rotating shaft 10 to form a locking position (shown in fig. 2) and an unlocking position (shown in fig. 3). The engaging member 11 is driven by the rotation of the rotating shaft 10 to move to form a limit engaging position where the rotation limit is provided with the limit part and a limit releasing position where the rotation limit is released from the limit part.

When the operating member 2 is in the locking position, the engaging member 11 is in the limit engaging position, and the inner cover 15 can rotate with the outer cover 5 in at least one direction around the axis of the rotating shaft 10. When the operating member 2 is in the unlocking position, the engagement member 11 is in the limit release position, and the outer cap 5 is independently rotatable about the rotational axis relative to the inner cap 15.

When the fuel tank cap provided by the embodiment needs to be taken down from the fuel tank, a user rotates the fuel tank cap from the unlocking position to the locking position by rotating the operation member 2, and then rotates the outer cap 5, so that the inner cap 15 is driven to take down the fuel tank cap, the opening process is simple, and the operation is convenient.

As shown in fig. 1 and 4, the inner lid 15 is attached to the inside of the outer lid 5. The inner lid 15 is used to form a seal with the filler opening of the fuel tank. In order to balance the pressure inside and outside the oil tank, the inner cover 15 is also provided with an air inlet one-way valve 30 and an air outlet one-way valve 40. Wherein the inlet check valve 30 is opened when a pressure difference, in which an external pressure (atmospheric pressure) exceeds an internal pressure of the tank, is greater than a first predetermined value. The outlet check valve 40 opens when the pressure difference between the tank internal pressure and the external pressure exceeds a second predetermined value.

The air inlet check valve 30 and the air outlet check valve 40 are similar in structure, and each check valve comprises a valve pressure cover 6, a valve spring 7/12, a valve core 8 and a valve rubber plate 9. The valve pressure cover 6 is provided on the valve chamber on the inner cover 15. The valve spring, the valve core 8 and the valve rubber plate 9 are all positioned in the valve cavity of the inner cover 15. The difference between the inlet check valve 30 and the outlet check valve 40 is that the valve rubber plate 9 and the valve cover are located on the side of the valve spring away from the outer cover 5 or close to the outer cover 5.

In the air inlet one-way valve 30, the valve rubber plate 9 and the valve cover are positioned on one side of the valve spring 12 close to the outer cover 5, the valve rubber plate 9 is fixed on the valve pressure cover 6 to form a valve seat, and the valve core 8 is propped by the valve spring 12 to prop the valve rubber plate 9 to form a seal. In the air outlet one-way valve 40, the valve rubber plate 9 and the valve cover are positioned on one side of the valve spring 7 far away from the outer cover 5, the valve rubber plate 9 is fixed at the bottom of the valve cavity to form a valve seat, the valve core 8 is propped against by the valve spring 7 to prop against the valve rubber plate 9 to form a seal, and the other end of the valve spring is propped against the valve pressure cover 6.

With continued reference to fig. 1 and 4, the inner cover 15 has a cylindrical body. An end plate is fixed to one end (hereinafter referred to as a bottom end) of the cylinder away from the outer cover 5. The end plate has a through hole for the shaft 10 to pass through. The fixed cover 21 is fixedly connected to the end cover by screws 23. The lower end of the rotating shaft 10 penetrates through the fixing cover 21 and is connected with a nut 25. Between the nut 25 and the fixed cover 21 is a washer 24 fitted over the lower end of the rotating shaft 10. The outer sleeve of the cylinder body is provided with a bottom cover 18 and a snap ring 19. The outer edge of the snap ring 19 has a plurality of snaps evenly distributed along the circumferential direction. The clamping buckle can be buckled into a fuel filler of a fuel tank. A sliding gasket 16 and a sealing gasket 17 are provided between the bottom cover 18 and the inner cover 15. A sliding gasket 16 is located between the sealing gasket 17 and the inner cover 15.

Between the snap ring 19 and the stationary cover 21 there is a cylindrical spring 20. The fixed cover 21 is provided with a spring washer 22. The cylindrical spring 20 is compressed between the snap ring 19 and the stationary cover 21. The barrel and the snap ring 19 are rotationally connected (similar to a spline connection). The snap ring 19 and the bottom cover 18 are axially movably sleeved outside the cylinder body. When the snap ring 19 is screwed into the oil filler hole, the snap ring 19 presses the fixing cap 21 via the cylindrical spring 20, and the oil filler hole is sealed by the fixing cap 21 driving the inner cap 15.

In the present embodiment, the engaging member 11 acts to form different positions (states) under the rotation of the rotating shaft 10, wherein the action of the engaging member 11 may be rotation, translation, or irregular movement, or a combination of different actions. Specifically, the engagement member 11 can be driven by the rotation of the rotating shaft 10 to expand and contract in the radial direction. The engagement member 11 is extended and contracted in the radial direction to change the radial length with respect to the rotation axis 10, thereby forming a limit engagement position and a limit release position, and thus, the rotation of the inner lid 15 is interlocked and released.

Specifically, the outer cover 5 is provided with an inner tube sleeved outside the rotating shaft 10. The inner pipe is sleeved between the cylinder and the rotating shaft 10. The side wall of the inner tube has a lateral opening. The engagement member 11 protrudes from the lateral opening during the turning of the operating member 2 from the unlocking position to the locking position.

As shown in connection with fig. 5, the engagement member 11 comprises a sliding joint. An O-ring 14 is provided between the slip joint and the end plate of the cartridge. The sliding joint includes a ring portion 110 sleeved between the rotating shaft 10 and the inner pipe, and an embedded portion 111 fixedly connected to the ring portion 110. The insert 111 is located in the lateral opening in the restraint release position and extends out of the lateral opening in the restraint engagement position. When the operating member 2 is in the unlocking position, the strip-shaped engaging portion 111 is engaged in the lateral opening with its radially outer end surface lower than the outer wall surface of the inner tube, and at this time, the engaging member 11 rotates together with the outer cap 5, and the inner cap 15 does not rotate together with the outer cap 5 due to the clamping action of the snap ring 19. When the operating member 2 is in the locking position, the insertion portion 111 of the engaging member 11 extends radially outward from the lateral opening, and the insertion portion 111 comes into contact with the stopper portion to form a rotation stopper when rotating about the rotation axis, so that the outer cap 5 and the inner cap 15 can be rotated together by the insertion portion 111.

In this embodiment, the limiting part comprises a joint protrusion arranged on the inner wall of the cylinder and attached to the outer wall of the inner tube. The engaging projection may be of a configuration similar to an axially extending rib. The inner wall of the barrel body can be provided with a plurality of jointing bulges which are uniformly distributed along the circumferential direction, so that excessive idle rotation is avoided when the barrel body is locked, and a user can rotate the inner cover 15 to remove the oil filling cover as soon as possible.

In order to make the sliding joint slide along the radial direction, and further to realize the controllability that the embedded part 111 extends out of the inner pipe, the rotating shaft 10 is provided with an abutting part which can push the sliding joint along the radial direction. The abutting portion is an eccentric protrusion 101 (similar to an eccentric cam) disposed on the rotating shaft 10. The ring portion 110 of the sliding joint is sleeved outside the eccentric protrusion 101. When the sliding joint rotates from the unlocking position to the locking position, the sliding joint is limited by the rotation of the lateral opening of the cylinder body (circumferential limit), and the sliding joint does not rotate. The eccentric protrusion 101 pushes the ring part 110 radially due to the eccentric arrangement, enabling the protrusion of the embedding part 111 from the lateral opening.

In order to facilitate the projection of the engaging member 11 from the lateral opening, an abutment spring 13 is also provided inside the inner tube. The counter spring 13 exerts a force on the engagement member 11 that protrudes out of the lateral opening. When the rotating shaft 10 is located at the unlocking position, the eccentric protrusion 101 of the rotating shaft 10 pushes the ring portion 110 to be pressed inward, and when the rotating shaft 10 rotates to the locking position, the eccentric protrusion 110 loses the pressing force of the abutting spring 13, which pushes the ring portion 110 in the radial direction, so that the insertion portion 111 protrudes from the lateral opening.

Of course, the stopper portion is not limited to the engaging projection in the present embodiment. In another embodiment, the limiting part can also be an embedded groove on the side wall of the cylinder body. When the engagement member 11 is inserted into the insertion groove, the inner lid 15 and the outer lid 5 form a rotational connection, and the inner lid 15 can rotate together with the outer lid 5.

As shown in fig. 2 and 3, the operating member 2 includes a handle covering the top surface 50 of the outer cover 5. The handle is located on the outside of the outer lid 5. The handle has a connecting end 201 connected to the shaft 10 extending out of the outer cover 5, and a positioning end 202 operatively positioned on the outer cover 5. Wherein, the top surface 50 of the outer cover 5 is fixedly provided with a locking ring 55, and the positioning end 202 is provided with a positioning connecting ring 203 matched with the locking ring 55. The positioning attachment ring 203 is in aligned communication with the lock ring 55 when the handle is in the unlocked position shown in fig. 3. When the handle is located the unblock position, the accessible lock will fix a position go-between 203 and lock ring 55 and lock, with the handle locking in unblock position, when the fuel tank cap is dismantled to needs, will lock through the key and open, remove the handle again, reach the theftproof effect of preferred.

The locking ring 55 is mounted vertically on the top surface 50 of the outer cover 5, near the outer edge of the outer cover 5. A positioning coupling ring 203 is secured to one side of the positioning end 202 to facilitate a substantial fit with the locking ring 55. Of course, when the positioning end 202 contacts the lock ring 55, one side of the handle (the side where the lock ring 55 is located) may be limited in rotation, so that the handle cannot continue to rotate toward the side where the lock ring 55 is located, and the user is reminded that the handle has been rotated to the specified unlocking position. The panel of handle roughly sets up with the top surface 50 of enclosing cover 5 parallel, and the location go-between 203 is vertical to be installed (stand-type installation) at the location end 202 of handle, and then can carry out the application of force through location go-between 203 when stirring the handle, and then convenience of customers application of force operation.

In this embodiment, the outer cap 5 is centrally provided with a central axial hole through which one end (hereinafter referred to as "outer end") of the rotation shaft 10 protrudes from the top surface 50 of the outer cap 5 to be connected to the connection end 201 of the handle. A sealing ring and a gasket are arranged between the connecting end 201 and the top surface 50 of the outer cover 5 and sleeved outside the outer end for axial sealing.

The top surface 50 of the outer cover 5 is also provided with a limiting bulge 51. When the handle is located at the locking position, the handle abuts against the limiting protrusion 51, and one side of the handle is limited by the rotation of the limiting protrusion 51. The stopper protrusion 51 protrudes from the top surface 50 of the exterior cover 5, and the edge at the central shaft hole protrudes inward in the radial direction. The stop protrusion 51 is located in the rotational path of the connection end 201. The cross section of the limiting protrusion 51 (as shown in the top views of fig. 1 and 2) is a trapezoidal structure. The stopper protrusion 51 has a first stopper side 511 and a second stopper side 512 in a circumferential direction.

The connecting end 201 is a connecting shifting fork connected with one end of the rotating shaft 10. The connection fork has a first fork end surface 206 and a second fork end surface 205 located at both sides of the rotation shaft 10 in the length direction of the pin 1. The connecting shifting fork is connected with the outer end of the rotating shaft 10 through a connecting pin 1. As shown in fig. 3, when the handle is located at the unlocking position, the first fork end surface 206 abuts against the first limit side surface 511, and one side of the handle is rotationally limited by the limit protrusion 51. At this time, the handle cannot be further rotated in the direction from the lock position to the unlock position, and the handle is connected to the lock ring 55 by the lock, and further, the handle is rotated together with the outer cover 5 when the outer cover 5 is rotated.

As shown in fig. 2, when the handle is located at the locking position, the second fork end surface 205 abuts against the second limiting side surface 512, and the other side of the handle is rotationally limited by the limiting protrusion 51. At this time, the handle cannot be further rotated in the direction from the unlock position to the lock position. When facing fig. 2, when the handle is in the locking position, the counterclockwise rotation of the handle is restricted by the restricting projection 51, and by rotating the outer lid 5 counterclockwise, the restricting projection 51 is pushed by the handle to rotate counterclockwise together with the outer lid 5. The sliding joint inside the fuel tank cap will contact with the engaging protrusion, and the outer cap 5 will drive the inner cap 15 to rotate counterclockwise together, completing the removal of the fuel tank cap from the filler neck of the fuel tank.

Any numerical value recited herein includes all values from the lower value to the upper value that are incremented by one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited, and all possible combinations of numerical values between the lowest value and the highest value that are explicitly recited in the specification in a similar manner are to be considered.

Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. The use of "about" or "approximately" with a range applies to both endpoints of the range. Thus, "about 20 to about 30" is intended to cover "about 20 to about 30", including at least the endpoints specified.

All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.

A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of the subject matter that is disclosed herein is not intended to forego such subject matter, nor should the inventors be construed as having contemplated such subject matter as being part of the disclosed inventive subject matter.

Claims

1. A fuel tank cap, comprising:

an outer cover;

the inner cover is arranged on the inner side of the outer cover and is provided with a limiting part;

the outer cover and the inner cover are sleeved outside the rotating shaft;

the outer cover is externally provided with an operating component which is used for receiving force to drive the rotating shaft to rotate, and the operating component and the rotating shaft rotate to form a locking position and an unlocking position;

the joint component is arranged outside the rotating shaft and is used for being matched with the limiting part, and the joint component can be driven by the rotation of the rotating shaft to act to form a limiting joint position with the limiting part and a limiting release position with the limiting part, wherein the limiting joint position has the rotation limiting function, and the limiting release position releases the rotation limiting function;

2. The tank cap according to claim 1, wherein the engagement member is driven to expand and contract in a radial direction by rotation of the rotation shaft.

3. The tank cap according to claim 1, wherein the outer cap is provided with an inner tube sleeved outside the rotating shaft; the side wall of the inner tube has a lateral opening; the engagement member protrudes from the lateral opening during rotation of the operating member from the unlocked position to the locked position.

4. The tank cap according to claim 3, wherein the engagement member comprises a sliding joint; the sliding joint comprises a ring part sleeved between the rotating shaft and the inner pipe and an embedded part fixedly connected with the ring part; the insert is located in the lateral opening in the limiter release position and extends out of the lateral opening in the limiter engagement position.

5. The tank cap according to claim 4, wherein the inner cap has a barrel body fitted around the inner tube; the limiting part comprises a joint protrusion arranged on the inner wall of the barrel and attached to the outer wall of the inner tube.

6. The tank cap according to claim 4, wherein the rotation shaft is provided with an eccentric protrusion; the ring part of the sliding joint is sleeved outside the eccentric bulge.

7. The tank cap according to claim 1, wherein the operating member comprises a handle covered on a top surface of the outer cap; the handle has a connecting end connected to the shaft extending out of the outer cover, and a positioning end operably positioned on the outer cover.

8. The tank cap according to claim 7, wherein a locking ring is fixedly provided on the top surface of the outer cap, and the positioning end is provided with a positioning connection ring which is matched with the locking ring; when the handle is located at the unlocking position, the positioning connecting ring is communicated with the locking ring in an alignment mode.

9. The tank cap according to claim 7, wherein a stopper protrusion is further provided on a top surface of the outer cap; the handle abuts against the limiting protrusion when located at the locking position, and one side of the handle is limited by the limiting protrusion in a rotating mode.

10. The tank cap according to claim 9, wherein the coupling end is a coupling fork coupled to one end of the rotation shaft; the connecting shifting fork is provided with a first shifting fork end face and a second shifting fork end face which are positioned at two sides of the rotating shaft; the limiting bulge is provided with a first limiting side surface and a second limiting side surface along the circumferential direction;

11. A fuel tank, comprising: the tank cap according to any one of claims 1 to 10, which is provided on a filler neck of the fuel tank.