CN211106954U - Noise reduction baffle for plastic fuel storage tank and fuel storage tank - Google Patents

Abstract

The utility model relates to a plastics fuel storage tank is with baffle of making an uproar falls, it falls baffle (1) of making an uproar including as should fall base plate (11) of the baffle main part of making an uproar and be used for fastening this fall the baffle of making an uproar to fuel storage tank's fixing device (12), its characterized in that, it still falls the baffle of making an uproar including setting up two surperficial a plurality of annular of base plate are protruding (13), wherein do not all exist total face to arbitrary two annular protruding (13). The invention also relates to a fuel tank comprising at least one noise reducing baffle (1) as described above, moulded from the same material as the fixing means (12) of the noise reducing baffle (1).

Description

Noise reduction baffle for plastic fuel storage tank and fuel storage tank

Technical Field

The present invention relates to the field of motor vehicles, in particular to fuel tanks made of plastic for motor vehicles, in particular noise reduction baffles for such tanks.

Background

On-board fuel systems on different types of vehicles typically include a tank for storing fuel. For the purposes of weight reduction, energy saving, etc., fuel tanks are increasingly being manufactured from comparatively lightweight plastic materials. The fuel tank generally comprises at least one noise reduction baffle for reducing noise associated with fuel sloshing and impacts that may occur inside the tank in the event of rapid acceleration, braking, cornering, etc. of the vehicle. This noise is also known as "splatter" noise and the noise reduction baffle is also known as a "breakwater".

Noise reduction baffles of the prior art are typically plate-like members having a plurality of holes through which fuel passes, such as the typical noise reduction baffle shown in FIG. 1. The noise reduction baffle is usually made of plastic, such as thermoplastic, particularly preferably of the same material as the tank. High density polyethylene, HDPE, is used more frequently as a material that is cost-effective, and exhibits good resistance to fuel and good durability.

However, the noise reduction effect of the noise reduction baffle of the prior art is not satisfactory in many cases. It would therefore be desirable to provide a noise reduction baffle with improved noise reduction, while at the same time being flexible to suit different noise reduction requirements, being light and not occupying too much of the internal volume of the fuel tank, and being easy to mass produce and manufacture.

SUMMERY OF THE UTILITY MODEL

Aiming at the requirements, the inventor obtains inspiration from the dense boss structure of the seaside wave-preventing dam, designs a novel noise reduction baffle, has a noise reduction effect which is obviously superior to that of the prior art, is convenient to manufacture, and can flexibly produce different models according to actual requirements.

Therefore, the utility model provides a plastic fuel storage tank is with making an uproar baffle falls, it includes the base plate as this baffle main part of making an uproar and is used for fastening this baffle of making an uproar to fuel storage tank's fixing device falls to fall, it still includes the setting to fall the baffle of making an uproar two annular of base plate are protruding on the surface a plurality of, wherein do not all have common face to arbitrary two annular are protruding.

The utility model discloses the thinking behind it lies in through providing as much as possible protruding in order to rock the inside fuel of storage tank and cut apart as little as possible with the energy of striking on the baffle of making an uproar to show and reduce the fuel splatter noise. Therefore, the noise reduction baffle according to the present invention provides a plurality of annular protrusions on both surfaces of the base plate without any common surface therebetween. These annular projections are numerous and spaced apart from each other, and are desirably densely distributed on the substrate surface, thereby providing a large number of surfaces for fuel collision so as to finely divide the fuel splash momentum, thereby greatly reducing the fluidity of the fuel, with the object of significantly reducing the fuel splash noise. Therefore, such an annular protrusion for noise reduction according to the present invention may also be referred to as a "noise reduction boss".

Preferably, in a noise reduction baffle according to the present invention, the at least two annular protrusions are not completely identical in shape or size.

Preferably, the annular protrusions protruding from the same surface of the substrate have at least two different protrusion heights. Further preferably, at least one of the annular projections itself has a non-uniform projection height.

Preferably, in the noise reduction baffle according to the present invention, the annular protrusion has a shape of a rectangular parallelepiped or a truncated cone.

Obviously, according to the utility model discloses a factor such as the annular protruding quantity, distribution, shape and size that are used for making an uproar on the baffle of making an uproar falls can influence the noise reduction effect, and consequently it is not unchangeable to different storage tanks, but can adjust in a flexible way in order to obtain the noise reduction effect of expectation according to actual demand. Advantageously, the shape or size of the plurality of annular protrusions on the same noise reduction baffle may be different, or the heights and densities of the annular protrusions may be different, or even the heights of the annular protrusions protruding from the surface of the substrate may be different. However, the annular protrusion of a complicated shape increases the difficulty of molding, and thus a somewhat repetitive shape that facilitates molding, such as a shape of a rectangular parallelepiped or a truncated cone, is used in practical production in a trade-off against the annular protrusion. From this, according to the utility model discloses a baffle of making an uproar both is convenient for produce, can obtain the noise reduction effect of optimization again to satisfy different demands.

Preferably, in the noise reduction baffle according to the present invention, the fixing means and the annular protrusion are integrally formed with the base plate in view of convenience of manufacture.

Preferably, in a noise reduction baffle according to the present invention, the base plate has a hole at the bottom of the at least one annular protrusion for the fuel to pass through the noise reduction baffle.

Preferably, in a baffle of making an uproar falls according to the utility model discloses, be used for with this baffle of making an uproar is fastened to the fixing device of fuel tank is used for with the baffle of making an uproar falls the welding post between the upper inner wall of fuel tank and lower inner wall. In actual production, a fixing device realized as four welding studs achieves good results.

The present invention additionally provides a fuel storage tank comprising at least one noise reduction baffle as described above, and molded from the same material as the fixing means of the noise reduction baffle.

By moulding the fuel tank and the fixing means of the noise reduction baffle at least from the same material, a firm connection is obtained between the fuel tank and the noise reduction baffle according to the invention, which is not liable to come off. In practice, a more common material is for example the high density polyethylene mentioned above, i.e. HDPE.

Drawings

Preferred embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. It is to be understood by those skilled in the art that the drawings are designed solely for the purposes of illustration and not as a definition of the limits of the invention. For purposes of illustration, the drawings are not necessarily to scale. In the drawings:

figure 1 shows a schematic view of a prior art noise reduction baffle;

figure 2 shows a schematic view of a noise reduction baffle according to an embodiment of the present invention, comprising four welding studs for welding the noise reduction baffle between the upper and lower inner walls of the fuel tank.

Detailed Description

In this context, terms describing directions and positions, such as "longitudinal", "transverse", "vertical", "upper", "lower", "top", "bottom", "inner", "outer", etc., are defined with reference to the XYZ coordinate system conventionally used by motor vehicles and to the conventional mounting of fuel tanks and noise reduction baffles.

Fig. 2 is a schematic view of a noise reduction baffle 1 according to an embodiment of the present invention, the noise reduction baffle 1 comprising a base plate 11 as its main body, a fixing device 12 for fastening the noise reduction baffle 1 to a fuel tank (not shown) and a plurality of annular protrusions 13 for noise reduction purposes. Only one surface of the substrate 11 is shown in fig. 2, on which a plurality of annular projections 13 are densely distributed, and these annular projections 13 are independent of each other, that is, there is no common surface therebetween.

When a vehicle is rapidly accelerated, braked or turned, the fuel stored in the fuel tank is subjected to relatively violent sloshing and tends to collide with the tank wall and the internal components. However, in the vehicle-mounted fuel tank including the noise reduction baffle 1 as shown in fig. 2, due to the presence of the large number of annular protrusions 13, the momentum of the fuel splashed onto the noise reduction baffle 1 is divided and refined by the large number of surfaces provided by the annular protrusions 13, so that the waves formed by fuel sloshing and splashing become small or even disappear, and thus the decibel peak of the fuel splash noise is significantly reduced.

It should be understood that the shape of the base plate 11 of the noise reduction baffle 1 shown in fig. 2 and the number, distribution, size, shape, etc. of the fixing means 12 and the annular protrusions 13 are merely examples, and may be actually provided as needed. For example, the annular protrusions 13 of fig. 2 are in the shape of a rectangular parallelepiped with a top surface thereof lifted off, and they have protrusions of different heights and have a portion cut off. However, the implementation of the annular projection of the noise reduction baffle according to the present invention is not limited thereto. As another example, the fixture 12 shown in FIG. 2 is four weld posts, two of which are used to weld to the upper interior wall of the tank and two of which are used to weld to the lower interior wall of the tank. The implementation of the welding columns of the noise reduction baffle according to the present invention is not limited thereto, however, and the noise reduction baffle according to the present invention may also be connected to the fuel tank by other suitable fastening means than welding, such as riveting.

In addition, in the embodiment shown in fig. 2, holes through which fuel passes are arranged in the substrate region between the annular projections 13. However, the embodiment of the holes in the noise reduction baffle according to the present invention is not limited thereto, and for example, the base plate area at the bottom of the annular protrusion 13 may have holes through which fuel passes.

To assist in a further understanding of the invention, a method of manufacturing a fuel tank comprising a noise reduction baffle according to an embodiment of the invention is briefly described below by way of example, wherein advantageously no additional openings are required on the fuel tank for fixing the noise reduction baffle, the manufacturing method comprising, for example, the following main steps:

-integrally forming a noise reduction baffle comprising a base plate, weld studs and annular protrusions;

-extruding a parison of the same material as the welded post around the noise reduction baffle simultaneously with or subsequent to the integral moulding of the noise reduction baffle and blow moulding the parison to give it the desired shape of the fuel tank;

-welding the welded columns of the noise reduction baffles firmly between the upper and lower inner walls of the fuel tank by cooling and solidification of the tank moulding.

The drawings and the foregoing description depict non-limiting specific embodiments of the invention. For the purpose of teaching inventive principles, some conventional aspects have been simplified or omitted. Those skilled in the art will appreciate variations from these embodiments that fall within the scope of the invention. Those skilled in the art will appreciate that the above-described features can be combined in various ways to form multiple variations of the invention. Accordingly, the scope of the present invention is not limited to the specific embodiments described above, but is only limited by the appended claims and their equivalents.

Claims (10)

1. Noise reduction baffle for a plastic fuel tank, said noise reduction baffle (1) comprising a base plate (11) as the main body of the noise reduction baffle and fixing means (12) for fastening the noise reduction baffle to said fuel tank, characterized in that said noise reduction baffle further comprises a plurality of annular protrusions (13) provided on both surfaces of said base plate, wherein there is no common face for any two annular protrusions (13).

2. Noise reduction baffle according to claim 1, wherein the at least two annular protrusions (13) do not completely coincide in shape or size.

3. Noise reduction baffle according to claim 1, wherein the annular protrusions (13) protruding from the same surface of the base plate (11) have at least two different protrusion heights.

4. Noise reduction baffle according to claim 3, wherein the at least one annular protrusion (13) has a non-uniform protrusion height per se.

5. Noise reduction baffle according to one of claims 1 to 4, wherein the annular protrusion (13) has the shape of a cuboid or a truncated cone.

6. Noise reduction baffle according to one of claims 1 to 4, wherein the fixing means (12) and the annular protrusion (13) are integrally formed with the base plate (11).

7. Noise reduction baffle according to one of claims 1 to 4, wherein the base plate (11) has holes at the bottom of at least one annular protrusion (13) for the fuel to pass through the noise reduction baffle (1).

8. Noise reduction baffle according to one of claims 1 to 4, wherein the fixing means (12) are welding studs for welding the noise reduction baffle (1) between an upper inner wall and a lower inner wall of the fuel tank.

9. The noise reduction baffle of claim 8, comprising four weld posts.

10. Fuel tank comprising at least one noise reduction baffle (1) according to one of claims 1 to 9, and moulded from the same material as the fixing means (12) of the noise reduction baffle (1).

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