CN220059751U - Fuel tank vent valve with adjustable upper filling limit - Google Patents

Abstract

The utility model relates to a fuel tank vent valve with an adjustable upper filling limit, comprising: a valve body having at least one through hole at the bottom thereof; a valve cover disposed on the valve body and defining a first interior space with the valve body, the valve cover being provided with a vent hole and a vent pipe; a valve core provided in the first inner space for closing the vent hole; a first housing, the bottom of which is formed to be at least partially open, is adjustably coupled to the lower portion of the valve body, and enables the total height of the first housing and the valve body after coupling to be adjusted. By means of the tank vent valve with an adjustable upper filling limit according to the utility model, the upper filling limit of the tank defined by the tank vent valve can be adjusted to flexibly adapt to tanks of different nominal volumes.

Description

Fuel tank vent valve with adjustable upper filling limit

Technical Field

The utility model relates to the technical field of vehicle fuel tank components, in particular to a fuel tank vent valve.

Background

Vehicles are an important vehicle indispensable in people's life. In general, a fuel tank vent valve is installed in a fuel tank of a vehicle for exhausting fuel vapor and/or air in the fuel tank. During refueling of the fuel tank with the refueling gun, the tank vent valve may be in an open state so as to vent fuel vapor and/or air from the fuel tank, thereby enabling smooth refueling of the fuel tank. When the fuel level in the fuel tank reaches a predetermined level, the fuel tank vent valve switches to a closed state such that fuel vapor and/or air in the fuel tank cannot escape. So that the pressure in the fuel tank rises, so that the fuel cannot continue to be filled into the fuel tank, and the fuel filling gun automatically stops filling, at which point the fuel level in the fuel tank is the upper filling limit of the fuel tank. It follows that the upper filling limit of the fuel tank may be defined by the closing of the tank vent valve, i.e. the tank vent valve may be used to define the upper filling limit of the fuel tank.

Typically, the upper fill limit defined by the tank vent valve is fixed (not adjustable) and matches only a specific tank nominal volume. When the fuel tank nominal volume of the new vehicle is different from the fuel tank nominal volume of the current vehicle or the fuel tank shape/structure of the new vehicle is different from the fuel tank shape/structure of the current vehicle, it is necessary to develop a new fuel tank vent valve to match the fuel tank nominal volume or the fuel tank shape/structure of the new vehicle, which results in higher development costs.

The above description of the background is only for the purpose of facilitating a thorough understanding of the present utility model's aspects (in terms of the means of technology used, the technical problems solved, and the technical effects produced, etc.) and should not be taken as an admission or any form of suggestion that the above constitutes prior art already known to those skilled in the art.

Disclosure of Invention

In view of the drawbacks of the prior art, it is an object of the present utility model to provide a fuel tank vent valve with an adjustable upper fill limit that can flexibly match fuel tanks of different nominal volumes by adjusting the upper fill limit of the fuel tank defined by the fuel tank vent valve.

Another object of the present utility model is to provide a fuel tank vent valve with an adjustable upper filling limit, which is mainly made of plastic material and has a compact structure and few components, so that the weight and manufacturing cost of the fuel tank vent valve can be reduced, the interior space of a vehicle can be effectively utilized, and the assembly and use are facilitated.

According to an exemplary embodiment of the present utility model, there is provided a fuel tank vent valve with an adjustable upper fill limit, comprising: a valve body having at least one through hole at the bottom thereof; a valve cover disposed on the valve body and defining a first interior space with the valve body, the valve cover being provided with a vent hole and a vent pipe; a valve core provided in the first inner space for closing the vent hole; a first housing, the bottom of which is formed to be at least partially open, is adjustably coupled to the lower portion of the valve body, and enables the total height of the first housing and the valve body after coupling to be adjusted.

Preferably, the outer surface of the lower portion of the valve body is formed with a first external thread, and the inner surface of the first housing is formed with a first internal thread, so that the first housing is adjustably coupled to the lower portion of the valve body by screw coupling of the first external thread and the first internal thread.

Preferably, the fuel tank vent valve with the adjustable filling upper limit further comprises a second shell, and a second external thread is formed on the outer surface of the middle part of the valve body, and the thread direction of the second external thread is opposite to that of the first external thread; the inner surface of the second housing is formed with a second internal thread, and the second housing can be connected to the middle part of the valve body and be in contact with the top of the first housing by the threaded connection of the second external thread and the second internal thread.

Preferably, a first connection part is formed at the top of the first housing, and a second connection part corresponding to the first connection part is formed at the bottom of the second housing, and the first housing and the second housing are connected through the first connection part and the second connection part.

Preferably, the fuel tank vent valve with an adjustable upper filling limit further includes a connection assembly, and the first connection portion is formed with at least one first connection hole, and the second connection portion is formed with at least one second connection hole corresponding to the first connection hole, the connection assembly comprising: a support portion having a shape corresponding to the first connection portion; an insertion portion formed on the support portion and extending upward perpendicular to the support portion, the insertion portion passing through the first and second connection holes and contacting the support portion with the first connection portion; a holding portion formed on the top of the insertion portion and extending laterally perpendicular to the insertion portion; and a clip formed with a shape corresponding to the clamping portion and fixedly connected to the clamping portion.

Preferably, the valve cover includes: a flange portion formed with a second inner space and having a bottom opening, an inner wall of the flange portion being provided with at least one stopper provided to extend downward along the inner wall from an inner top surface of the flange portion; and a joint part formed with a third inner space, a bottom of the joint part being opened and received in an upper portion of the valve body, the upper portion of the joint part being received in the second inner space of the flange part, a top wall of the joint part being formed with the vent hole and an edge of a top of the joint part being in contact with a bottom of the stopper.

Preferably, the upper outer surface of the joint is provided with a first seal to seal a gap between the joint and the flange.

Preferably, the flange portion of the valve cover includes at least one pair of lugs arranged to extend downwardly from the bottom of the flange portion; the upper outer surface of the valve body is provided with at least one pair of catching portions corresponding to the lugs, and the valve cover is fixedly coupled to the valve body by cooperation of the catching portions and the lugs.

Preferably, the flange portion further comprises a vent tube for connection to a carbon canister.

Preferably, an outer top surface of the valve body is formed with a protrusion corresponding to the vent hole, and the valve body is configured to be movable up and down in the first internal space such that the protrusion of the valve body can be inserted into or removed from the vent hole.

Preferably, the outer top surface of the valve core is provided with a second seal surrounding the protruding portion to seal a gap between the outer top surface of the valve core and the top wall of the joint portion when the protruding portion is inserted into the vent hole.

Preferably, the inner surface of the valve body is provided with at least one guide rib provided to extend upward from the bottom of the valve body to guide the up-and-down movement of the valve cartridge.

Preferably, the valve body is provided in a cylindrical shape having an opening at a bottom thereof and a fourth inner space is formed therein; the fourth internal space accommodates therein a spring, one end of which abuts against an inner upper surface of the valve body, and the other end of which abuts against a bearing portion provided on an inner lower surface of the valve body.

Preferably, a center of a bottom of the valve body is formed with a center through hole, and the bottom of the valve body has at least one circumferential through hole formed along a circumferential direction of the bottom of the valve body; the valve body is provided with a first guide post, the first guide post is in a cylindrical shape with two ends open and extends upwards from the bottom of the valve body, the lower end opening of the first guide post forms a middle through hole of the valve body, and the spring is arranged on the outer side of the first guide post; the valve core is provided with a second guide post, the second guide post is in a cylinder shape extending downwards from the inner top surface of the valve core, and the spring is arranged on the outer side of the second guide post.

Preferably, the carrier has at least one through-hole that fluidly connects the central through-hole and the circumferential through-hole.

Preferably, the gravity of the valve core is larger than the elastic force exerted by the spring on the valve core; the sum of buoyancy generated by fuel in the fuel tank and elastic force exerted on the valve core by the spring is larger than the gravity of the valve core.

Preferably, the side surface of the upper portion of the valve body is formed with at least one side through hole that communicates the inside and the outside of the valve body.

By adopting the technical scheme, the upper filling limit of the fuel tank defined by the fuel tank vent valve can be continuously adjusted to flexibly match fuel tanks with different nominal volumes, so that the development cost caused by matching the nominal volumes of the different fuel tanks is saved; by a compact structure and fewer components, the fuel tank vent valve can be made to occupy less fuel tank space, thereby effectively utilizing the interior space of the vehicle and facilitating assembly and use.

Drawings

Exemplary embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. For clarity, the same elements in different drawings are shown with the same reference numerals. It is noted that the figures are for illustrative purposes only and are not necessarily drawn to scale. In these figures:

FIG. 1 is a schematic perspective view of a fuel tank vent valve with an adjustable upper fill limit according to an exemplary embodiment of the utility model;

FIG. 2 is a schematic perspective view of an assembled valve body and valve cover of a fuel tank vent valve with an adjustable upper fill limit in accordance with an exemplary embodiment of the utility model;

FIG. 3 is a schematic cross-sectional view of a fuel tank vent valve with an adjustable upper fill limit according to an exemplary embodiment of the utility model taken along line A-A in FIG. 2;

FIG. 4 is a schematic perspective view of a valve body of a fuel tank vent valve with an adjustable upper fill limit according to an exemplary embodiment of the utility model;

FIG. 5 is a top view of a valve body of a fuel tank vent valve with an adjustable upper fill limit according to an exemplary embodiment of the utility model;

FIG. 6 is a schematic cross-sectional view of a valve body of a fuel tank vent valve with an adjustable upper fill limit according to an exemplary embodiment of the utility model taken along line B-B in FIG. 5;

FIG. 7 is a schematic cross-sectional view of a valve body of a fuel tank vent valve with an adjustable upper fill limit according to an exemplary embodiment of the utility model, taken along line C-C in FIG. 5;

FIG. 8 is an exploded schematic view of a fuel tank vent valve with an adjustable upper fill limit in accordance with an exemplary embodiment of the utility model;

FIG. 9 is an assembled schematic view of a portion of the connection assembly of the upper-fill-limit adjustable fuel tank vent valve shown in FIG. 8 in accordance with an exemplary embodiment of the present utility model;

FIG. 10 is an enlarged schematic illustration of portion A of the upper-fill-limit adjustable fuel tank vent valve shown in FIG. 1 in accordance with an exemplary embodiment of the present utility model;

FIG. 11 is an exploded schematic view of a valve cover of a fuel tank vent valve with an adjustable upper fill limit in accordance with an exemplary embodiment of the utility model;

FIG. 12 is a side view of a valve body of a fuel tank vent valve with an adjustable upper fill limit according to an exemplary embodiment of the utility model;

FIG. 13 is a schematic perspective view of a valve cartridge of a fuel tank vent valve with an adjustable upper fill limit in accordance with an exemplary embodiment of the utility model;

FIG. 14 is a schematic perspective view of a spring in a valve cartridge of an upper-fill-limit adjustable fuel tank vent valve in accordance with an exemplary embodiment of the utility model;

FIG. 15 is a schematic perspective view of the valve body of the upper-fill-limit adjustable fuel tank vent valve assembled with the first and second housings in accordance with an exemplary embodiment of the utility model;

FIG. 16 is a schematic illustration of an adjustment of the total height of a first housing and valve body of a tank vent valve with an adjustable upper fill limit in accordance with an exemplary embodiment of the utility model;

FIG. 17 is a schematic illustration of the first and second housings of the upper-fill-limit adjustable fuel tank vent valve in an upper limit position of the valve body in accordance with an exemplary embodiment of the present utility model;

FIG. 18 is a schematic illustration of the first and second housings of the upper-fill-limit adjustable fuel tank vent valve in a lower limit position of the valve body in accordance with an exemplary embodiment of the present utility model;

FIG. 19 is a schematic illustration of the first and second housings of the upper-fill-limit adjustable fuel tank vent valve in an intermediate position of the valve body in accordance with an exemplary embodiment of the utility model;

FIG. 20 is a schematic illustration of the flow path of fuel vapor and/or air of a fuel tank vent valve with an adjustable upper fill limit according to an exemplary embodiment of the present utility model mounted to a fuel tank when the fuel level does not reach the bottom of the first housing;

FIG. 21 is a schematic illustration of the flow paths of fuel vapor and/or air and fuel liquid of a fuel tank vent valve with an adjustable upper fill limit according to an exemplary embodiment of the present utility model mounted to a fuel tank when the fuel level reaches the bottom of a first housing;

FIG. 22 is a schematic illustration of the first and second housings remaining stable in position relative to the valve body as the upper-fill-limit adjustable fuel tank vent valve vibrates upward in accordance with an exemplary embodiment of the present utility model;

FIG. 23 is a schematic illustration of the first and second housings remaining stable in position relative to the valve body as the upper-fill-limit adjustable fuel tank vent valve vibrates downward in accordance with an exemplary embodiment of the present utility model;

FIG. 24 is a schematic illustration of a fuel tank vent valve with an adjustable upper fill limit to prevent fuel in the fuel tank from leaking out in the event of a vehicle rollover in accordance with an exemplary embodiment of the present utility model;

FIG. 25 is a schematic illustration of an upper-fill-limit adjustable fuel tank vent valve applied to a combination valve in accordance with an exemplary embodiment of the present utility model;

figure 26 is a schematic illustration of a tank vent valve with an adjustable upper fill limit installed inside a fuel tank according to an exemplary embodiment of the present utility model.

It should be understood that the drawings are not to scale but rather illustrate various features that are somewhat simplified in order to explain the basic principles of the utility model. In the drawings of the present utility model, like reference numerals designate like or equivalent parts of the present utility model.

Detailed Description

Reference will now be made in detail to various embodiments of the utility model, examples of which are illustrated in the accompanying drawings and described below. While the utility model will be described in conjunction with the exemplary embodiments thereof, it will be understood that the present description is not intended to limit the utility model to those exemplary embodiments. On the contrary, the utility model is intended to cover not only the exemplary embodiments of the utility model, but also various alternatives, modifications, equivalents, and other embodiments, which are included within the spirit and scope of the utility model as defined by the appended claims.

Hereinafter, various exemplary embodiments of the present utility model will be described more specifically with reference to the accompanying drawings.

Fig. 1 is a perspective view of a fuel tank vent valve with an adjustable upper limit according to an exemplary embodiment of the present utility model, fig. 2 is a perspective view of a valve body and a valve cover of the fuel tank vent valve with an adjustable upper limit according to an exemplary embodiment of the present utility model after assembly, fig. 3 is a cross-sectional view of the fuel tank vent valve with an adjustable upper limit according to an exemplary embodiment of the present utility model taken along line A-A in fig. 2, fig. 4 is a perspective view of a valve body of the fuel tank vent valve with an adjustable upper limit according to an exemplary embodiment of the present utility model, fig. 5 is a top view of a valve body of the fuel tank vent valve with an adjustable upper limit according to an exemplary embodiment of the present utility model taken along line B-B in fig. 5, fig. 6 is a cross-sectional view of a valve body of the fuel tank vent valve with an adjustable upper limit according to an exemplary embodiment of the present utility model taken along line C-C in fig. 5.

As shown in fig. 1 to 7, a fuel tank vent valve with an adjustable upper fill limit according to an exemplary embodiment of the present utility model may include: the valve includes a valve body 100, a valve cover 200, a valve cartridge 300, and a first housing 400.

As shown in fig. 5 to 7, in an exemplary embodiment of the present utility model, the valve body 100 may be formed in a cylindrical shape. The top of the valve body 100 has an opening, and preferably the top of the valve body 100 is completely open.

The bottom of the valve body 100 may have at least one through hole. In an exemplary embodiment of the present utility model, the center of the bottom of the valve body 100 may be formed with 1 central through hole 110, and 8 circumferential through holes 120 may be formed along the circumferential direction of the bottom of the valve body 100. Preferably, the circumferential through holes 120 may be uniformly formed at the bottom of the valve body 100. Further, a side surface of an upper portion of the valve body 100 may be formed with at least one side through hole 130, and the side through hole 130 may communicate an inside and an outside of the valve body 100.

Figure 8 is an exploded schematic view of a fuel tank vent valve with an adjustable upper fill limit in accordance with an exemplary embodiment of the utility model.

In an exemplary embodiment according to the present utility model, the first housing 400 may be formed in a cylindrical shape. The bottom of the first housing 400 may be formed to be at least partially open, and preferably, the bottom of the first housing 400 is completely open. The inner diameter of the first housing 400 may be equal to or greater than the outer diameter of the valve body 100 such that a lower portion of the valve body 100 may be at least partially accommodated in the first housing 400.

The first housing 400 is adjustably coupled to a lower portion of the valve body 100, and the total height of the first housing 400 and the valve body 100 after coupling is made adjustable. Specifically, in an exemplary embodiment according to the present utility model, the outer surface of the lower portion of the valve body 100 may be formed with the first external screw thread 140, and the inner surface of the first housing 400 may be formed with the first internal screw thread 410, and the first housing 400 may be adjustably coupled to the lower portion of the valve body 100 through the screw coupling of the first external screw thread 140 and the first internal screw thread 410.

In an exemplary embodiment according to the present utility model, the first external screw thread 140 of the valve body 100 may be formed around the outer surface of the lower portion of the valve body 100 in the first direction, and the first internal screw thread 410 of the first housing 400 may be formed to match the first external screw thread 140, so that the first housing 400 may be coupled to different heights of the lower portion of the valve body 100 according to actual needs, so that the total height of the first housing 400 and the valve body 100 after coupling can be varied.

The upper-limit adjustable filler tank vent valve according to an exemplary embodiment of the present utility model may further include a second housing 500. The second housing 500 may be formed in a cylindrical shape. Preferably, the top and bottom of the second housing 500 are completely open. The inner diameter of the second housing 500 may be equal to or greater than the outer diameter of the valve body 100 such that a middle portion of the valve body 100 may be at least partially accommodated in the second housing 500.

According to an exemplary embodiment of the present utility model, the outer surface of the middle portion of the valve body 100 may be formed with the second external thread 150, and the thread direction of the second external thread 150 may be opposite to that of the first external thread 140. Specifically, the second external thread 150 of the valve body 100 may be formed around the outer surface of the middle portion of the valve body 100 in the second direction.

Further, the inner surface of the second housing 500 may be formed with a second internal thread 510, and the second internal thread 510 of the second housing 500 may be formed to be matched with the second external thread 150, and the second housing 500 may be coupled to the middle of the valve body 100 and in contact with the upper surface of the top of the first housing 400 by the screw coupling of the second external thread 150 and the second internal thread 510.

In the process of connecting the first housing 400 and the second housing 500 to the valve body 100, the second housing 500 may be first screw-coupled to the middle portion of the valve body 100, and then the first housing 400 may be screw-coupled to the lower portion of the valve body 100 such that the first housing 400 moves upward through the screw coupling until the top portion of the first housing 400 contacts the bottom portion of the second housing 500. Since the first and second external threads 140 and 150 are threaded in opposite directions, the second housing 500 may limit the first housing 400 from continuing to move upward, and thus may define the highest position where the first housing 400 is connected to the lower portion of the valve body 100, to define the total height of the first housing 400 and the valve body 100 after connection. In case that it is required to increase the total height of the first housing 400 and the valve body 100 after being coupled, the first housing 400 may be first moved downward and then the second housing 500 may be moved downward until the bottom of the second housing 500 contacts the top of the first housing 400, so that the total height of the first housing 400 and the valve body 100 after being coupled may be increased. On the other hand, in case that it is required to reduce the total height after the first housing 400 and the valve body 100 are coupled, the second housing 500 may be first moved upward and then the first housing 400 may be moved upward until the top of the first housing 400 contacts the bottom of the second housing 500, so that the total height after the first housing 400 and the valve body 100 are coupled may be reduced.

In an exemplary embodiment according to the present utility model, the top of the first housing 400 may be formed with the first connection part 420, the first connection part 420 may be disposed to be formed in a circular ring shape radially outward from the top of the first housing 400, and the bottom of the second housing 500 may be formed with the second connection part 520, and the second connection part 520 may be disposed to be formed in a circular ring shape radially outward from the top of the second housing 500. The second connection part 520 may be formed to correspond to the first connection part 420, and the first case 400 and the second case 500 may be connected through the first connection part 420 and the second connection part 520.

In the exemplary embodiment according to the present utility model, since the screw directions of the first and second external screw threads 410 and 510 are opposite, the positions of the first and second housings 400 and 500 with respect to the valve body 100 can be maintained stable by fixedly coupling the first coupling part 420 to the second coupling part 520 after coupling the first and second housings 400 and 500 to the valve body 100.

Preferably, the outer diameter of the first connection part 420 may be formed to be equal to the outer diameter of the second connection part 520 such that the outer edges of the first connection part 420 and the second connection part 520 may be vertically aligned with each other when the first housing 400 and the second housing 500 are connected to the valve body 100.

In an exemplary embodiment according to the present utility model, the first connection part 420 may be formed with at least one first connection hole 421, the second connection part 520 may be formed with at least one second connection hole 521, and the second connection hole 521 may correspond to the first connection hole 421. Specifically, the first connection hole 421 penetrates the first connection part 420 in the vertical direction, and the second connection hole 521 penetrates the second connection part 520 in the vertical direction.

According to an exemplary embodiment of the present utility model, 4 first connection holes 421 may be formed in the circumferential direction of the first connection part 420, 4 second connection holes 521 may be formed in the circumferential direction of the second connection part 520, and lengths of the first connection holes 421 and the second connection holes 521 may be long enough so that the first connection holes 421 and the second connection holes 521 may be at least partially aligned in the vertical direction when the first connection part 420 and the second connection part 520 are connected to the valve body 100.

Preferably, the first connection holes 421 may be uniformly formed at the first connection part 420, and the second connection holes 521 may be uniformly formed at the second connection part 520.

Fig. 9 is an assembled schematic view of a part of the connection assembly of the upper limit adjustable fuel tank vent valve according to the exemplary embodiment of the utility model shown in fig. 8, and fig. 10 is an enlarged schematic view of a part a of the upper limit adjustable fuel tank vent valve according to the exemplary embodiment of the utility model shown in fig. 1.

The upper-fill-limit adjustable fuel tank vent valve according to an exemplary embodiment of the present utility model may further include a connection assembly, which may include: a support portion 610, an insertion portion 620, a clamping portion 630, and a clip 640.

The support portion 610 may have a shape corresponding to the first connection portion 420. In an exemplary embodiment of the present utility model, the supporting portion 610 may be formed in a circular ring shape, and an inner diameter of the supporting portion 610 may be formed to be equal to or greater than an outer diameter of the valve body 100, and an outer diameter of the supporting portion may be formed to be equal to an outer diameter of the first connection portion 420.

The insertion portions 620 may be formed on the support portion 610 and extend upward perpendicular to the support portion 610, and in an exemplary embodiment of the present utility model, two insertion portions 620 are symmetrically formed in a radial direction of the support portion 610. The present utility model is not limited thereto and the insertion part 620 may be formed with one or more. Further, the lengths of the alignment areas of the first and second connection holes 421 and 521 in the horizontal direction are set so that the insertion portion can pass smoothly, and preferably, the lengths of the alignment areas of the first and second connection holes 421 and 521 are greater than the lengths of the insertion portion in the horizontal direction.

The insertion portion 620 may pass through the first and second connection holes 421 and 521, and may contact the support portion 620 with the first connection portion 420. After the second housing 500 and the first housing 400 are sequentially coupled to the valve body 100, the insertion part 620 may sequentially pass through the first coupling hole 421 and the second coupling hole 521 until the supporting part 610 contacts the lower surface of the first coupling part 420 of the first housing 400, and the insertion part 620 protrudes from the upper surface of the second coupling part 520 of the second housing 500.

The catching portion 630 may be formed at the top of the insertion portion 620 and extend laterally perpendicular to the insertion portion 620. In an exemplary embodiment of the present utility model, the tops of both sides of the groove of the insertion part 620 may be formed with two catching parts 630, and the catching parts 630 may be formed in a trapezoidal shape as shown in fig. 9.

The clip 640 may be formed with a shape corresponding to the catching part 630, and may be fixedly coupled to the catching part 630. In an exemplary embodiment of the present utility model, the clip 640 may be formed in an "i" shape, and the bottom of the clip 640 may be formed with an opening so that the clamping portion 630 may pass through the bottom of the clip 640 and so that the top surface of the clamping portion 630 contacts the lower surface of the top of the clip 640 while the bottom surface of the clamping portion 630 contacts the upper surface of the bottom of the clip 640, thereby fixedly clamping the clip 640 to the clamping portion 630.

In an exemplary embodiment of the present utility model, the insertion part 620 may be formed in a rectangular parallelepiped shape having a middle groove such that the insertion part 620 may be elastically deformed when an external force is applied, so that the clip 640 is smoothly connected to the clamping part 630 or disconnected from the clamping part 630.

In an exemplary embodiment of the present utility model, the connection assembly may fixedly connect the first housing 400 and the second housing 500 together. Specifically, the second housing 500 and the first housing 400 are first coupled to the valve body 100 in succession, and then the insertion portion 620 of the coupling assembly is passed through the first coupling hole 421 and the second coupling hole 521 in succession until the support portion 610 of the coupling assembly contacts the lower surface of the first coupling portion 420 of the first housing 400, and after the insertion portion 620 protrudes from the upper surface of the second coupling portion 520 of the second housing 500, the clip 640 of the coupling assembly may be fixedly coupled to the catching portion 630 of the coupling assembly to fixedly couple the first housing 400 and the second housing 500 through the respective components of the coupling assembly. Accordingly, even if there is an external force, since the connection assembly fixedly connects the first housing 400 and the second housing 500 together and the screw directions of the first external screw thread 140 and the second external screw thread 150 are opposite, the positions of the first housing 400 and the second housing 500 with respect to the valve body 100 can be maintained stable. However, the present utility model is not limited thereto, and for example, the first connection part 420 may be formed with a protrusion, the second connection part 520 may be formed with a catching part, and the first connection part 420 may be fixedly connected to the second connection part 520 through connection between the protrusion and the catching part, thereby fixedly connecting the first housing 400 to the second housing 500.

Figure 11 is an exploded schematic view of a valve cover of a fuel tank vent valve with an adjustable upper fill limit in accordance with an exemplary embodiment of the utility model.

As shown in fig. 3 and 11, in an exemplary embodiment of the present utility model, a valve cover 200 may be provided on the valve body 100 and define a first inner space 1000 together with the valve body 100.

Specifically, the valve cover 200 may include a flange portion 210 and an engagement portion 220. In an exemplary embodiment of the present utility model, the flange portion 210 may be provided in a cylindrical shape, thereby forming the second inner space 2000. The top of the flange portion 210 is closed and the bottom of the flange portion 210 is open, preferably the bottom of the flange 210 is completely open.

Further, the inner wall of the flange portion 210 may be provided with at least one stopper 211, the stopper 211 may be formed separately and may be welded to the inner wall of the flange portion 210, or the stopper 211 may be integrally formed with the flange portion 210. Specifically, the stopper 211 may have a rectangular parallelepiped shape, but the present utility model is not limited thereto, and for example, the stopper 211 may be formed in a cylindrical shape. In an exemplary embodiment of the present utility model, the stopper 211 may be provided to extend downward a distance along the inner wall from the inner top surface of the flange portion 210. The length of the stopper 211 may be between 1/3 and 1/2 of the height of the inner wall of the flange portion 210, but the present utility model is not limited thereto.

The joint 220 may be provided in a cylindrical shape so that a third internal space 3000 may be formed, and the bottom of the joint 220 may be open, preferably, the bottom of the joint 220 may be completely open.

In an exemplary embodiment of the present utility model, the outer diameter of the bottom of the joint 220 may be equal to or less than the inner diameter of the upper portion of the valve body 100, so that the bottom of the joint 220 may be received in the upper portion of the valve body 100. Further, an outer diameter of an upper portion of the engagement portion 220 may be equal to an outer diameter of an upper portion of the valve body 100, so that the upper portion of the engagement portion 220 may be supported on the upper portion of the valve body 100. Thereby, the joint 220 can be assembled to the valve body 100.

An outer diameter of an upper portion of the joint portion 220 may be equal to or less than an inner diameter of the flange portion 210, so that the upper portion of the joint portion 220 may be accommodated in the second inner space of the flange portion 210. The top wall of the joint 220 may be formed with a vent hole 221. In an exemplary embodiment of the present utility model, the vent hole 221 may be formed at a middle portion of the top wall of the joint 220, and the vent hole 221 may be formed in a circular shape.

In an exemplary embodiment of the present utility model, when the joint 220 is assembled into the flange portion 210, an edge of a top of the joint 220 may contact a bottom of the stopper 211. An upper portion of the joint 220 may be formed with a first seal 222 provided to an outer surface of the upper portion of the joint 220 so as to seal a gap between the joint 220 and the flange 210 when the joint 220 is assembled into the flange 210. In an exemplary embodiment of the present utility model, the first seal 222 may be an O-ring, which may be of rubber material.

The flange portion 210 of the valve cover 200 may include at least one pair of lugs 212, and the lugs 212 may be disposed to extend downwardly from the bottom of the flange portion 210. In an exemplary embodiment of the present utility model, the flange portion 210 of the valve cover 200 may be provided with a pair of lugs 212, and the pair of lugs 212 may be symmetrically arranged. The lugs 212 may extend a distance in the circumferential direction of the flange portion 210, and may extend a distance downward from the bottom of the flange portion 210. The middle of the lug 212 may have an opening 213, and in an exemplary embodiment of the present utility model, the opening 213 may be formed in a rectangular shape, and preferably, the opening 213 may be formed in a rounded rectangular shape. The present utility model is not limited thereto and, for example, the opening 213 may be formed in a circular shape or an oval shape.

Figure 12 is a side view of a valve body of a fuel tank vent valve with an adjustable upper fill limit according to an exemplary embodiment of the utility model.

As shown in fig. 2, 7 or 12, an upper outer surface of the valve body 100 may be provided with at least one pair of catching portions 160 corresponding to the lugs 212. In an exemplary embodiment of the present utility model, an upper outer surface of the valve body 100 may be provided with a pair of catching portions 160 corresponding to the lugs 212, and the pair of catching portions 160 may be symmetrically arranged so that the valve cover 200 may be fixedly coupled to the valve body 100.

Flange portion 210 may further include a vent tube 214, and vent tube 214 may be connected to an external component (not shown), such as a carbon canister. In an exemplary embodiment of the present utility model, the vent pipe 214 may extend outwardly from an upper portion of the flange portion 210 in a radial direction of the flange portion 210, and the vent pipe 214 may be formed in a circular tube shape such that the vent pipe 214 may communicate with the second inner space of the flange portion 210 so that fuel vapor and/or air discharged through the vent hole 221 and the vent pipe 214 may be collected by an external member such as a canister. In addition, air flowing from the outside or other components may enter the valve body 100 through the vent pipe 214 and the vent hole 221, and further into the fuel tank.

Fig. 13 is a schematic perspective view of a valve cartridge of a fuel tank vent valve with an adjustable upper fill limit according to an exemplary embodiment of the utility model.

The outer top surface of the valve cartridge 300 may be formed with a protrusion 310 corresponding to the vent hole 221. The protrusion 310 may be provided to extend upward in the axial direction of the valve cartridge 300 from the center of the outer top surface of the valve cartridge 300. In the exemplary embodiment of the present utility model, the protrusion 310 may be formed in a spherical shape in order to be matched with the vent hole 221 of the joint 220, and the outer diameter of the protrusion 310 may be smaller than the inner diameter of the vent hole 221, but the present utility model is not limited thereto, for example, the protrusion 310 may be formed in a cylindrical shape. The protruding portion 310 may be formed separately or may be integrally formed with the valve body 300.

The valve body 300 may be configured to be movable up and down in the first internal space 1000 such that the protrusion 310 of the valve body 300 may be inserted into the vent hole 221 or removed from the vent hole 221. In an exemplary embodiment of the present utility model, the valve cartridge 300 may be formed in a closed-top cylindrical shape. The outer diameter of the valve cartridge 300 may be smaller than the inner diameter of the valve body 100, and the height of the valve cartridge 300 may be smaller than the height of the valve body 100, so that the valve cartridge 300 may be accommodated in the first inner space 1000 of the valve body 100. With the valve cover 200 assembled to the valve body 100, the protrusion 310 of the valve body 300 may be inserted into the vent hole 221 when the valve body 300 moves upward in the first internal space 1000; when the valve cartridge 300 moves downward in the first internal space 1000, the protrusion 310 of the valve cartridge 300 may be removed from the vent hole 221.

The outer top surface of the valve cartridge 300 may be provided with a second seal 320, and the second seal 320 may be formed around the protrusion 310. In an exemplary embodiment of the present utility model, the second seal 320 may be formed in a circular ring shape, and the second seal 320 may be made of rubber. The lower surface of the second seal 320 may be coupled to the outer top surface of the valve cartridge 300. When the protrusion 310 is inserted into the vent hole 221, the upper surface of the sealing member 320 may contact the top wall of the joint 220, so that a gap between the outer top surface of the valve body 300 and the top wall of the joint 220 may be sealed to prevent fuel vapor and/or air in the fuel tank from flowing out of the vent hole 221.

As shown in fig. 4 and 6, the inner surface of the valve body 100 may be provided with at least one guide rib 170. In an exemplary embodiment of the present utility model, the top of the guide rib 170 may have a curvature to facilitate the installation of the valve cartridge 300 into the valve body 100. The guide rib 170 may be formed separately or integrally with the valve body 100. In the exemplary embodiment of the present utility model, four guide ribs 170 are formed in the circumferential direction of the valve body 100, and preferably, the guide ribs 170 may be uniformly arranged in the circumferential direction of the valve body 100.

In an exemplary embodiment of the present utility model, the guide rib 170 may be formed to extend upward from the bottom of the valve body 100 by a certain distance so as to stably guide the up-and-down movement of the valve body 300 when the valve body 300 is assembled into the valve body 100 and when the valve body 300 is moved in the first inner space 1000 of the valve body 100, and to prevent the valve body 300 from tilting during the movement.

Fig. 14 is a perspective view of a spring in a valve cartridge of an upper limit adjustable fuel tank vent valve according to an exemplary embodiment of the utility model.

The valve cartridge 300 may be provided in a cylindrical shape having an opening at the bottom and a fourth internal space 4000 formed therein. As shown in fig. 3, the spring 330 may be accommodated in the fourth inner space 4000, and an outer diameter of the spring 330 may be smaller than an inner diameter of the valve cartridge 300. One end of the spring 330 may be abutted to an inner upper surface of the valve body 300, and the other end of the spring 330 may be abutted to an inner lower surface provided to the valve body 100, such that the spring 330 is in a compressed state in the fourth inner space 4000 of the valve body 300.

The inner lower surface of the valve body 100 may be provided with a bearing 180, and the other end of the spring 330 may abut against the upper surface of the bearing 180. The bearing part 180 may be provided in a ring shape centering on the center of the bottom of the valve body 100, but the present utility model is not limited thereto. The carrier 180 may be provided for supporting the compression or extension movement of the spring 330 in the fourth inner space 4000 of the cartridge 300.

The valve body 100 may be provided with a first guide post 191, and the first guide post 191 may be formed in a circular tube shape. In an exemplary embodiment of the present utility model, the first guide post 191 may be formed in a circular tube shape extending upward from the bottom of the valve body, and the lower end opening of the first guide post 191 may form the middle through hole 110 of the valve body 100. The inner diameter of the spring 330 may be greater than the outer diameter of the first guide post 191 such that the spring 330 may be disposed outside the first guide post 191, so that the first guide post 191 may guide the compression or extension movement of the spring 330 when the spring 330 is elastically deformed.

The valve cartridge 300 may be provided with a second guide post 192, and the second guide post 192 may be formed in a cylindrical shape. In an exemplary embodiment of the present utility model, the second guide post 192 may be formed in a cylindrical shape extending downward from the inner top surface of the valve cartridge 300. The inner diameter of the spring 330 may be greater than the inner diameter of the second guide post 192 such that the spring 330 may be disposed outside the second guide post 192 such that the second guide post 192 may guide the compression or extension movement of the spring 330 when the spring 330 is elastically deformed.

In the exemplary embodiment of the present utility model, the first guide post 191 and the second guide post 192 may be provided in order to better guide the spring 330, but the present utility model is not limited thereto. In alternative embodiments, only the first guide post 191 may be provided, or only the second guide post 192 may be provided.

The carrier 180 may have at least one through hole 1801 extending in a radial direction. In an exemplary embodiment of the present utility model, the carrier 180 may have 4 through holes 1801 uniformly arranged in the circumferential direction, and the through holes 1801 may fluidly communicate the central through hole 110 and the circumferential through hole 120 so that fuel, fuel vapor, and/or air flowing through the central through hole 110 and fuel, fuel vapor, and/or air flowing through the circumferential through hole 120 may communicate with each other.

The assembly of the upper limit adjustable filler tank vent valve according to the exemplary embodiment of the utility model will be described in detail.

Fig. 15 is a perspective view illustrating the assembly of the valve body 100 of the upper limit adjustable filler fuel tank vent valve with the first housing 400 and the second housing 500 according to an exemplary embodiment of the present utility model.

The step of assembling a fuel tank vent valve with an adjustable upper fill limit according to an exemplary embodiment of the present utility model may include: s1) placing the spring 330 in the first inner space 1000 of the valve body 100 using the first guide post 191 such that the lower portion of the spring 330 surrounds the outer side of the first guide post 191; s2) placing the valve body 300 in the first inner space 1000 of the valve body 100 using the second guide post 192 and the guide rib 170 such that the spring 330 is accommodated in the fourth inner space 4000 of the valve body 300 and such that the upper portion of the spring 330 surrounds the outer side of the second guide post 192; s3) connecting the bonnet 200 to the valve body 100, wherein the joint portion 220 may be connected to the valve body 100 first, and then the flange portion 210 may be connected to the joint portion 220, alternatively, the joint portion 220 may be connected to the flange portion 210 first, and then the joint portion 220 may be connected to the valve body 100; s4) connecting the second housing 500 to the middle of the valve body 100; s5) connects the first housing 400 to the lower portion of the valve body 100 such that the upper surface of the top of the first housing 400 is in contact with the lower surface of the bottom of the second housing 500.

In order to fixedly connect the first housing 400 and the second housing 500 together, the step of assembling the fuel tank upper limit adjustable fuel tank vent valve according to the exemplary embodiment of the present utility model may further include: s6) fixedly coupling the first housing 400 and the second housing 500 together using the coupling assembly. Specifically, in the exemplary embodiment of the present utility model, S6-1) the insertion part 620 is inserted into the first connection hole 421 of the first housing 400 and the second connection hole 521 of the second housing 500 such that the support part 610 is in contact with the lower surface of the top of the first housing 400; s6-2) fixedly connects the clip 640 to the catch 630.

Fig. 16 is a schematic view of an adjustment of the total height of the first housing 400 of the upper limit adjustable filler fuel tank vent valve and the valve body 100 after connection according to an exemplary embodiment of the present utility model.

As shown in fig. 16, when it is desired to reduce the total height of the first housing 400 of the fuel tank vent valve and the valve body 100 after they are coupled for fuel tanks of different nominal volumes, the total height of the first housing 400 of the fuel tank vent valve and the valve body 100 after they are coupled can be adjusted as follows: 1) Rotating the second housing 500 in a certain direction to move the second housing 500 upward; 2) Rotating the first housing 400 in a direction opposite to the rotation direction of the second housing, causing the first housing 400 to move upward until the top of the first housing 400 contacts the bottom of the second housing 500; 3) The insertion portion 620 is passed through the first connection hole 421 of the first housing 400 and the second connection hole 521 of the second housing 500, and then the clip 640 is fixedly coupled to the clamping portion 630.

In the case where it is required to increase the total height of the first housing 400 of the fuel tank vent valve and the valve body 100 after being connected, the total height of the first housing 400 of the fuel tank vent valve and the valve body 100 after being connected may be adjusted as follows: 1) Rotating the first housing 400 in a certain direction, causing the first housing 400 to move downward; 2) Rotating the second housing 500 in a direction opposite to the rotation direction of the second housing, causing the second housing 500 to move downward until the bottom of the second housing 500 contacts the top of the first housing 400; 3) The insertion portion 620 is passed through the first connection hole 421 of the first housing 400 and the second connection hole 521 of the second housing 500, and then the clip 640 is fixedly coupled to the clamping portion 630.

Fig. 17 is a schematic view in which the first housing 400 and the second housing 500 of the upper limit-adjustable fuel tank vent valve according to the exemplary embodiment of the present utility model are at the upper limit position of the valve body 100, fig. 18 is a schematic view in which the first housing 400 and the second housing 500 of the upper limit-adjustable fuel tank vent valve according to the exemplary embodiment of the present utility model are at the lower limit position of the valve body 100, and fig. 19 is a schematic view in which the first housing 400 and the second housing 500 of the upper limit-adjustable fuel tank vent valve according to the exemplary embodiment of the present utility model are at the middle position of the valve body 100.

FIG. 20 is a schematic illustration of the flow path of fuel vapor and/or air of a fuel tank vent valve with an adjustable upper fill limit according to an exemplary embodiment of the present utility model mounted to a fuel tank when the fuel level does not reach the bottom of the first housing.

After the upper limit adjustable filler fuel tank vent valve according to the exemplary embodiment of the present utility model is assembled, the fuel tank vent valve may be fixedly connected to the fuel tank. In an exemplary embodiment of the present utility model, the upper limit adjustable fuel tank vent valve may further include a flange portion 230, and the flange portion 230 of the fuel tank vent valve may be welded to the outer top surface of the fuel tank 700, but the present utility model is not limited thereto.

In an exemplary embodiment of the present utility model, the weight of the valve cartridge 300 is greater than the elastic force applied to the valve cartridge 300 by the spring 330. Therefore, the protrusion 310 of the valve body 300 is positioned below the vent hole 221 of the valve cover 200 without other external force. When the fuel tank is refueled with the refueler, fuel vapor and/or air in the fuel tank may enter the first interior space 1000 of the valve body 100 through the bottom opening of the first housing 400, the circumferential through-hole 120 and/or the middle through-hole 110 and the through-hole 1801 and then be discharged to an external component (e.g., a canister) through the vent hole 221 and the vent pipe 214 when the liquid level 800 of the fuel in the fuel tank is lower than the bottom of the first housing 400. Further, since the side of the upper portion of the valve body 100 may be formed with at least one side through hole 130, and the side through hole 130 may communicate the inside and the outside of the valve body 100, fuel vapor and/or air in the fuel tank may also flow into the first inner space 1000 of the valve body 100 through the side through hole 130 and then be discharged to an external part such as a canister through the vent hole 221 and the vent pipe 214.

FIG. 21 is a schematic illustration of the flow paths of fuel vapor and/or air and fuel liquid of a fuel tank vent valve with an adjustable upper fill limit according to an exemplary embodiment of the present utility model mounted to a fuel tank when the fuel level reaches the bottom of a first housing.

In an exemplary embodiment of the present utility model, when the level 800 of the fuel in the fuel tank reaches the bottom of the first housing 400 during refueling of the fuel tank with the refueling gun, the fuel level may seal the bottom of the first housing 400 such that the fuel vapor and/or air in the fuel tank cannot continue to flow through the bottom opening, the circumferential through-hole 120, and/or the middle through-hole 110 of the first housing 400 into the valve body 100. The fuel vapor and/or air in the fuel tank can be discharged only through the side through holes 130 and the vent holes 221, so that the discharge rate of the fuel vapor and/or air in the fuel tank is low, and the pressure in the fuel tank is rapidly increased, thereby forcing the fuel to gradually enter the first inner space 1000 of the valve body 100 and the fourth inner space 4000 of the valve body 300 from the bottom opening of the first housing 400, the middle through hole 110, the through hole 1801, and the circumferential through hole 120, and then to come into contact with the valve body 300. When the valve cartridge 300 receives a sum of buoyancy force generated by fuel in the fuel tank and elastic force applied to the valve cartridge 300 by the spring 330 is greater than the gravity force of the valve cartridge 300, the spring 330 may perform an extending motion to support the valve cartridge 300 upward, thereby promoting upward movement of the valve cartridge 300 until the protrusion 310 of the valve cartridge 300 is inserted into the vent hole 221 and the second seal 320 of the valve cartridge 300 contacts the top wall of the joint 220. In this case, the vent hole 221 is closed by the second seal 320, and fuel vapor and/or air in the fuel tank cannot be discharged out of the fuel tank. At this time, the pressure in the fuel tank rises instantaneously, and the fuel cannot be continuously filled into the fuel tank, so that the fuel filling gun can automatically stop filling, and the fuel filling process is finished.

As can be seen from the above description, the total height of the first housing 400 of the fuel tank vent valve and the valve body 100 after connection may define the upper filler limit of the fuel tank. Specifically, the smaller the total height of the first housing 400 of the tank vent valve and the valve body 100 after connection, the later the fuel can reach the bottom of the first housing 400 when being filled, the more fuel is filled, and accordingly the greater the upper limit of filling of the tank; conversely, the greater the overall height of the first housing 400 of the tank vent valve and the valve body 100 after connection, the earlier the fuel reaches the bottom of the first housing 400 upon filling, the less fuel is filled and, correspondingly, the lower the upper limit of filling of the tank.

Thus, with the structure of the present utility model, by continuously adjusting the total height of the first housing 400 of the tank vent valve and the valve body 100 after connection, the upper filling limit of the fuel tank can be adjustably defined to flexibly match fuel tanks of different nominal volumes, thereby saving a lot of development investment costs due to changing the shape of the fuel tank or designing a new tank vent valve as a result of matching different nominal volumes of the fuel tank.

In an exemplary embodiment of the present utility model, the bottom of the first housing 400 may be formed with at least one recess 430 (as shown in fig. 20), and the recess 430 may prevent the pressure in the fuel tank from increasing excessively instantaneously during the fuel filling process before the fuel level reaches the bottom of the first housing 400 and before the bottom of the liquid seal.

Fig. 22 is a schematic diagram of the first housing 400 and the second housing 500 being maintained stable with respect to the position of the valve body 100 when the upper limit-adjustable-filler fuel tank vent valve vibrates upward according to an exemplary embodiment of the present utility model, and fig. 23 is a schematic diagram of the first housing 400 and the second housing 500 being maintained stable with respect to the position of the valve body 100 when the upper limit-adjustable-filler fuel tank vent valve vibrates downward according to an exemplary embodiment of the present utility model.

As shown in fig. 22, when the upper limit adjustable fuel tank vent valve according to the exemplary embodiment of the present utility model vibrates upward with the vehicle, both the first housing 400 and the second housing 500 have a tendency to move downward due to inertia. Since the screw direction of the second external screw thread 150 of the valve body is opposite to that of the first external screw thread 140, the first housing 400 and the second housing 500 will rotate in opposite directions due to the inertia. However, since the first housing 400 and the second housing 500 are fixedly coupled together, the rotational movements of the first housing 400 and the second housing 500 may cancel each other. Therefore, there is no change in the position of the upper fill limit of the fuel tank defined by the fuel tank vent valve.

Similarly, as shown in fig. 23, when the upper limit adjustable fuel tank vent valve according to the exemplary embodiment of the present utility model vibrates downward with the vehicle, both the first housing 400 and the second housing 500 have a tendency to move upward due to inertia. Since the screw direction of the second external screw thread 150 of the valve body is opposite to that of the first external screw thread 140, the first housing 400 and the second housing 500 will rotate in opposite directions due to the inertia. However, since the first housing 400 and the second housing 500 are fixedly coupled together, the rotational movements of the first housing 400 and the second housing 500 may cancel each other. Therefore, there is no change in the position of the upper fill limit of the fuel tank defined by the fuel tank vent valve.

FIG. 24 is a schematic illustration of a tunable upper fill tank vent valve to prevent fuel in a fuel tank from leaking out in the event of a vehicle rollover in accordance with an exemplary embodiment of the present utility model.

In an exemplary embodiment of the present utility model, the sum of the elastic force applied to the valve body 300 by the spring 330 and the gravity of the valve body 300 is greater than the buoyancy force generated by the valve body 300 subjected to the fuel in the fuel tank. In the event of rollover of the vehicle, fuel in the fuel tank will flow into the first interior space 1000 of the valve body 100 and the fourth interior space 4000 of the valve body 300 through the bottom opening of the first housing 400, the middle through-hole 110, the circumferential through-hole 120, the side through-holes 130, and the like. However, since the sum of the elastic force applied to the valve body 300 by the spring 330 and the gravity of the valve body 300 is greater than the buoyancy force generated by the fuel in the fuel tank to which the valve body 300 is subjected, the valve body 300 will move downward until the protruding portion 310 of the valve body 300 is inserted into the vent hole 221 and the second sealing member 320 of the valve body 300 contacts the top wall of the joint 220. In this case, therefore, the vent hole 221 may be closed by the second seal 320, and the fuel in the fuel tank may not flow out through the vent hole 221.

Figure 25 is a schematic illustration of a fuel tank vent valve with an adjustable upper fill limit applied to a combination valve in accordance with an exemplary embodiment of the present utility model.

The upper limit adjustable fuel tank vent valve according to an exemplary embodiment of the present utility model may be replaced by a combination valve cartridge or the like. The combination valve integrates a number of functions, such as a tank vent valve function, an ROV function, and an adjustable tank filler upper limit function. As a result, the fuel tank vent valve structure becomes more compact.

Figure 26 is a schematic illustration of a tank vent valve with an adjustable upper fill limit installed inside a fuel tank according to an exemplary embodiment of the present utility model.

As shown in fig. 26, the upper limit adjustable filler tank vent valve according to an exemplary embodiment of the present utility model may be installed inside the fuel tank, which helps to improve the size and packaging of the fuel tank. In an exemplary embodiment of the present utility model, the upper limit adjustable filler tank vent valve according to an exemplary embodiment of the present utility model may be welded to the inside of the fuel tank, for example, by means of heat resistance welding.

By using the fuel tank vent valve with the adjustable filling upper limit, the filling upper limit of the fuel tank can be continuously adjusted, and the fuel tank with different nominal volumes can be flexibly matched, so that a great deal of research and development cost caused by changing the shape of the fuel tank or designing a new fuel tank vent valve due to matching different nominal volumes of the fuel tank is saved.

In addition, the height adjustment configuration of the upper fill limit adjustable fuel tank vent valve of the present utility model (the valve body external threads, the first housing, the second housing, and the connection assembly) can be readily applied to other products such as ROVs, combination valves, CFLVVs, leveling pipe joints in fuel tanks, and any component requiring a change in position. The height adjustment of other valves can be achieved by replacing the valve body internal components (valve element, spring, etc.) of the present utility model with those of other valves.

In addition, the fuel tank vent valve with the adjustable upper filling limit has the advantages of more compact structure, fewer components and more reliability, does not occupy too much fuel tank space, can effectively utilize the internal space of the vehicle, and can be assembled and used conveniently.

The foregoing description of the exemplary embodiments of the utility model has been presented only for the purposes of illustration and description. And embodiments of the utility model are not intended to be exhaustive or to limit the utility model to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. The preferred embodiments were chosen and described in order to explain certain principles of the utility model and its practical application to thereby enable others skilled in the art to make and utilize various exemplary embodiments and various alternatives and modifications thereof. It is intended that the scope of the utility model be defined by the following claims and their equivalents.

Claims (17)

1. A fuel tank vent valve with an adjustable upper fill limit, comprising:

a valve body having at least one through hole at the bottom thereof;

a valve cover disposed on the valve body and defining a first interior space with the valve body, the valve cover being provided with a vent hole and a vent pipe;

a valve core provided in the first inner space for closing the vent hole;

a first housing, the bottom of which is formed to be at least partially open, is adjustably coupled to the lower portion of the valve body, and enables the total height of the first housing and the valve body after coupling to be adjusted.

2. The adjustable upper fill tank vent valve of claim 1 wherein the outer surface of the lower portion of the valve body is formed with a first external thread and the inner surface of the first housing is formed with a first internal thread, the first housing being adjustably connected to the lower portion of the valve body by threaded connection of the first external thread and the first internal thread.

3. The fuel tank vent valve with adjustable upper limit for filling as recited in claim 2, further comprising a second housing, and wherein an outer surface of the middle portion of the valve body is formed with a second external thread having a thread direction opposite to a thread direction of the first external thread;

The inner surface of the second housing is formed with a second internal thread, and the second housing can be connected to the middle part of the valve body and be in contact with the top of the first housing by the threaded connection of the second external thread and the second internal thread.

4. A fuel tank vent valve with an adjustable upper fill limit as set forth in claim 3, wherein a first connecting portion is formed at a top of the first housing and a second connecting portion corresponding to the first connecting portion is formed at a bottom of the second housing, the first and second housings being connected by the first and second connecting portions.

5. The adjustable upper fill limit fuel tank vent valve of claim 4, further comprising a connection assembly, and wherein the first connection portion is formed with at least one first connection aperture and the second connection portion is formed with at least one second connection aperture corresponding to the first connection aperture, the connection assembly comprising:

a support portion having a shape corresponding to the first connection portion;

an insertion portion formed on the support portion and extending upward perpendicular to the support portion, the insertion portion passing through the first and second connection holes and contacting the support portion with the first connection portion;

A holding portion formed on the top of the insertion portion and extending laterally perpendicular to the insertion portion;

and a clip formed with a shape corresponding to the clamping portion and fixedly connected to the clamping portion.

6. The adjustable upper fill limit fuel tank vent valve of claim 1, wherein said valve cover comprises:

a flange portion formed with a second inner space and having a bottom opening, an inner wall of the flange portion being provided with at least one stopper provided to extend downward along the inner wall from an inner top surface of the flange portion;

and a joint part formed with a third inner space, a bottom of the joint part being opened and received in an upper portion of the valve body, the upper portion of the joint part being received in the second inner space of the flange part, a top wall of the joint part being formed with the vent hole and an edge of a top of the joint part being in contact with a bottom of the stopper.

7. A fuel tank vent valve as defined in claim 6, wherein an upper outer surface of the engagement portion is provided with a first seal to seal a gap between the engagement portion and the flange portion.

8. The adjustable upper fill tank vent valve of claim 6, wherein the flange portion of the valve cover comprises at least one pair of lugs disposed to extend downwardly from a bottom of the flange portion;

the upper outer surface of the valve body is provided with at least one pair of catching portions corresponding to the lugs, and the valve cover is fixedly coupled to the valve body by cooperation of the catching portions and the lugs.

9. The adjustable upper fill tank vent valve of claim 6, wherein the flange portion further comprises a vent tube for connection to a carbon canister.

10. The adjustable upper fill limit fuel tank vent valve of claim 1, wherein an outer top surface of the valve core is formed with a protrusion corresponding to the vent hole, the valve core being configured to be movable up and down in the first interior space such that the protrusion of the valve core can be inserted into or removed from the vent hole.

11. The adjustable upper fill limit fuel tank vent valve of claim 10, wherein the outer top surface of the valve core is provided with a second seal surrounding the protrusion to seal a gap between the outer top surface of the valve core and the top wall of the junction when the protrusion is inserted into the vent hole.

12. A fuel tank vent valve as defined in claim 11, wherein the inner surface of the valve body is provided with at least one guide rib disposed to extend upwardly from the bottom of the valve body to guide the upward and downward movement of the valve cartridge.

13. The fuel tank vent valve with an adjustable upper fill limit according to claim 1, wherein the valve element is provided in a cylindrical shape having an opening at a bottom and having a fourth internal space formed therein;

the fourth internal space accommodates therein a spring, one end of which abuts against an inner upper surface of the valve body, and the other end of which abuts against a bearing portion provided on an inner lower surface of the valve body.

14. A fuel tank vent valve with adjustable upper limit for filling as defined in claim 13, wherein a center of a bottom portion of the valve body is formed with a central through hole, the bottom portion of the valve body having at least one circumferential through hole formed along a circumferential direction of the bottom portion of the valve body;

the valve body is provided with a first guide post, the first guide post is in a cylindrical shape with two ends open and extends upwards from the bottom of the valve body, the lower end opening of the first guide post forms a middle through hole of the valve body, and the spring is arranged on the outer side of the first guide post;

The valve core is provided with a second guide post, the second guide post is in a cylinder shape extending downwards from the inner top surface of the valve core, and the spring is arranged on the outer side of the second guide post.

15. The adjustable upper fill limit fuel tank vent valve of claim 14, wherein the carrier portion has at least one through bore fluidly connecting the central through bore and the circumferential through bore.

16. The adjustable upper fill limit fuel tank vent valve of claim 13, wherein the weight of the valve spool is greater than the spring force exerted by the spring on the valve spool;

the sum of buoyancy generated by fuel in the fuel tank and elastic force exerted on the valve core by the spring is larger than the gravity of the valve core.

17. A fuel tank vent valve with an adjustable upper fill limit as set forth in claim 1, wherein the upper side of the valve body is formed with at least one side through hole that communicates the inside and outside of the valve body.