CN1911699A - Automobile fuel tank - Google Patents

Abstract

The automobile oil tank includes one oil tank body for storing fuel, and one oil filling pipe for filling the oil tank body with oil. The oil filling pipe has double layer structure in the upper section and the middle section, and the double layer structure includes an inner pipe as the oil feeding part for the fuel oil to be fed into the oil tank and a ring pipe between the outer pipe and the inner pipe as the air exhausting part for air to be exhausted from the oil filling pipe. The aeration pipe connects the oil tank body with the oil feeding port of the oil filling pipe.

Description

car fuel tank

【Technical field】

The invention relates to an automobile oil tank, which is used in an automobile fuel supply system, in particular to an automobile oil tank used for storing fuel and supplying fuel to an engine system.

【Background technique】

Automobile fuel tank is an important part of automobile fuel supply system. Among them, the refueling performance is one of the important indicators to test the performance of the automobile fuel tank. The design of the automobile fuel tank must ensure that it is unobstructed during the refueling process, and overflow and reverse flow are not allowed.

At present, the filling pipes of most automobile fuel tanks are connected to the upper part of the fuel tank body, so that when filling fuel, the fuel can be smoothly injected into the fuel tank body without spillage or backflow.

However, due to the structure of the body, some fuel tanks cannot meet this arrangement. The car fuel tank shown in Figure 1. Because the upper part of the fuel tank is close to the automobile floor 10, and a beam 11 is located at the rear of the fuel tank, the filling pipe cannot extend upwards from the upper part of the fuel tank body. In the fuel tank, the lower end of the filling pipe is connected to the middle and lower part of the fuel tank body. Due to the structure of the vehicle body, there is a horizontal part 3 at the bottom of the filler pipe, and then extends upwards. When filling the fuel tank body 1 with fuel, if the fuel liquid level in the fuel tank body reaches a certain height, the horizontal part of the filler pipe bottom will also be full of fuel. In this case, once the fueling gun 12 works, the upper part of the fueling pipe may be quickly filled with fuel sprayed out at a high speed. A closed air layer 13 can be formed in the middle of the filler pipe like this. As the air layer flows in the reverse direction, the fuel will also flow in the reverse direction, and when it reaches the height of the fuel injection gun, it will cause the fuel gun to automatically stop refueling.

【Content of invention】

The invention provides a fuel tank, which can solve the problem of failure to refuel or misoperation of the refueling gun when the lower and upper parts of the refueling pipe are filled with fuel and a closed air layer is formed in the middle of the refueling pipe, and the air can be discharged smoothly. Complete fueling.

The automobile fuel tank for achieving the above object of the present invention comprises: a fuel tank body for storing fuel; a fuel filler pipe for refueling in the fuel tank body; a breather pipe for connecting the fuel tank body and the fuel filler pipe near the filling port; it is characterized in that : Double-layer pipes are formed between the upper position and the middle position of the oil filling pipe.

The connection position between the fuel tank body and the filling pipe is located at the middle and lower part of the fuel tank body.

The refueling pipe includes three parts, the lower part is a horizontal pipe, the upper part is a vertical pipe, and the middle part is a folded pipe, which connects the upper part and the lower refueling pipe.

The double-layer pipe structure is divided into an oil inlet part and an exhaust part, the inner pipe is the oil inlet part, and the annular pipe formed by the inner pipe and the outer pipe is the exhaust part.

There is a hole in the upper part of the inner tube of the oil filling pipe, and the gas is used to discharge from the hole.

The interface of the breather pipe and the oil filling pipe communicates with one of the holes.

With the automobile fuel tank structure provided by the present invention, due to the use of double-layer pipes, when refueling, the air in the middle of the oil pipe can be smoothly discharged from the interlayer between the inner and outer layers, which can effectively solve the problem of the formation of a closed air layer in the refueling pipe that cannot be refueled or refueled The problem of gun mishandling made refueling possible. Moreover, the design of the structure fully considers mechanical processing, has low cost, and is easy to realize mass production.

【Description of drawings】

Figure 1 is a schematic diagram of the structure of an ordinary fuel tank.

Figure 2 is a schematic diagram of the structure of the fuel tank with double-layer filler pipes.

Fig. 3 is a schematic diagram of a partially enlarged structure of a double-layer tube.

Fig. 3' is a sectional view of A-A in Fig. 3 .

Fig. 4 is a schematic diagram of the enlarged structure of the double-layer pipe structure near the oil filling port.

【Detailed ways】

The present invention is described in further detail below:

As shown in Fig. 2, the automobile fuel tank of the present embodiment comprises: a fuel tank body 1, which is used to store fuel; a filling pipe 14, which is used to refuel the fuel tank body, and the upper position of the filling pipe is a double-layer pipe between the middle position, as shown in Fig. 3 As shown, the double-layer pipe structure is divided into an oil inlet part and an exhaust part, wherein the inner pipe 9 is the oil inlet part, and the oil inlet part ensures that the fuel enters the fuel tank, and the annular pipe formed by the inner pipe 9 and the outer pipe 8 is the exhaust part , the exhaust part can discharge the closed air layer formed in the middle of the filling pipe; the breather pipe connects the fuel tank body and the vicinity of the filling port of the filling pipe.

According to the above fuel tank structure, as shown in Figure 2, under normal circumstances, fuel is added from the filling pipe, and as the fuel enters the fuel tank, the air in the fuel tank is discharged from the vent pipe to achieve smooth refueling. Once the lower part of the filling pipe is filled, and the upper part of the filling pipe is quickly filled with the fuel sprayed from the filling gun, when an air layer is formed in the middle of the filling pipe, the air can also be discharged through the exhaust part of the double-layer pipe, so that There will be no fuel backflow, causing the fuel gun to stop refueling in advance.

As shown in Fig. 3 and Fig. 3 ', the inner pipe 9 is a refueling part, and the fuel sprayed by the refueling gun flows into the fuel tank body from the inner pipe 9. The annular pipe formed by the inner pipe 9 and the outer pipe 8 can realize the exhaust function. As shown in Figure 4, there are two circular holes on the upper part of the inner tube 9 of the fuel filler pipe, from which the gas is discharged. Simultaneously, the interface between the breather pipe and the oil filling pipe communicates with one of the circular holes, and the air in the breather pipe is also discharged therefrom.

Claims (6)

1. A fuel tank for an automobile, comprising: a fuel tank body (1) for storing fuel; a refueling pipe (14) for refueling into the fuel tank body (1); a breather pipe (2) for connecting the fuel tank body (1) It is connected with the vicinity of the filling port of the filling pipe (2); it is characterized in that: the upper position to the middle position of the filling pipe (14) is a double-layer pipe. 2. The automobile fuel tank according to claim 1, characterized in that the connection position between the fuel tank body (1) and the filling pipe (14) is located at the middle and lower part of the fuel tank body (1). 3. The automobile fuel tank according to claim 1, characterized in that: the filling pipe (14) consists of three parts, the lower part (3) is a horizontal pipe, the upper part (5) is a vertical pipe, and the middle part (4) is a folded pipe pipe, and connect the upper part with the lower refueling pipe. 4. The automobile fuel tank according to claim 1, characterized in that: the double-layer pipe structure is divided into an oil inlet part and an exhaust part, the inner pipe (9) is the oil inlet part, and the inner pipe (9) and the outer pipe (8) ) The annular pipe formed is the exhaust part. 5. The automobile fuel tank according to claim 1, characterized in that there is a hole (15) on the upper part of the inner tube (9) of the fuel filler pipe, through which air is discharged. 6. The automobile fuel tank according to claim 1, characterized in that: the interface between the breather pipe (2) and the filling pipe (14) communicates with one of the holes (15).

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