KR100570039B1 - Suction cutting apparatus in a fuel tank - Google Patents

Abstract

The present invention relates to a suction shutoff device of a saddle fuel tank for preventing air from being sucked through an inlet of a suction line connected to the sub tank when the amount of fuel stored in the sub tank is small in the saddle fuel tank.

In the saddle-type fuel tank in which the main tank and the sub tank is formed separately, and a pipe-shaped suction line is formed to allow the fuel in the sub tank to be guided to the main tank side.

A chamber having a predetermined volume provided on the suction side of the suction line located in the sub tank;

A valve seat provided in the middle of the chamber to define an upper and lower portions, and a valve hole communicating with the upper and lower portions in the middle thereof;

A valve positioned below the valve seat for closing the valve hole during the ascending operation and opening the valve ball during the descending operation;

A float connected to the lower end of the valve by a rod such that the shank-dong of the valve is linked with the amount of fuel in the sub tank; Characterized in that comprises a.

Fuel Tank, Suction Block, Sub Tank, Valve

Description

Suction cutting apparatus in a fuel tank

1 is a configuration diagram of a saddle type fuel tank according to the present invention.

Figure 2 is an enlarged cross-sectional view of the suction blocking device according to the present invention.

Figure 3 is a view showing an operating state of the suction cutoff device according to the present invention.

4 to 5 are views for explaining the conventional technology.

※ Explanation of code for main part of drawing

10 fuel tank 11: main tank

12: sub tank 13: fuel pump

14: suction line 14a: suction pipe

20: suction breaker 21: chamber

22: valve seat 23: valve ball

24: valve 25: head portion

26: Load 27: Float

28: sender arm 29: hinge

30: spring

The present invention relates to a suction shutoff device for a saddle fuel tank, and more particularly, in a saddle fuel tank in which a fuel storage space is divided into a main tank and a sub tank, when the amount of fuel stored in the sub tank is small, the sub tank is connected to the sub tank. Suction blocker of the saddle fuel tank for preventing the intake of air through the inlet of the suction line is provided.

The fuel tank is for storing fuel required for driving the vehicle, and a cylindrical storage tank having a predetermined storage volume is attached to the lower side or one side of the vehicle body.

4 is a cross-sectional view of a saddle-type fuel tank mainly mounted in a passenger vehicle, the lower plate of the tank is concave so that the exhaust pipe, etc. according to the layout of the vehicle can be positioned across the lower middle portion of the fuel tank 10. The fuel tank 10 is divided into a main tank 11 and a sub tank 12 based on the concave portion.

The relatively large volume side is the main tank 11 and the narrow volume side is the sub tank 12, and the main tank 11 is equipped with a fuel pump 13 for pumping fuel to the engine side. A suction line 14 is connected between the tank 11 and the sub tank 12 on the other side to allow fuel on the sub tank 12 side to move to the main tank 11 side.

On the other hand, the fuel that is moved from the sub tank 12 side to the main tank 11 side is concentrated around the fuel pump 13, the reservoir cup 15 so that the pumping to the fuel pump 13 can be performed smoothly ) Is formed to a predetermined size so as to wrap around the fuel pump 13.

The reservoir cup 15 is configured such that not only the fuel in the sub tank 11 but also the return fuel which is pumped by the fuel pump 13 and is not consumed by the engine but is returned to the fuel tank again. To this end, the upper side of the reservoir cup 15 is formed with a jet valve 17 to which the suction line 14 and the fuel return line 16 are simultaneously connected to the sub tank 12.

As shown in FIG. 5, the orifice 18 is formed in the jet valve 17 so that the negative pressure is transmitted to the suction line 14 by the pressure of the returned fuel. That is, the principle that the fuel in the sub tank 12 is led to the main tank 11 side through the suction line 14 is achieved by the orifice 18 described above.

Therefore, the fuel in the sub tank 12 is caused by the strong negative pressure generated while passing through the orifice 18 at 70 to 90% of the pumping amount pumped from the fuel pump 13 and returned through the return line. Is first drawn into the reservoir cup 15 and consumed first over the fuel on the main tank 11 side.

However, when the amount of fuel stored in the sub tank is lower than the suction port of the suction line, air is introduced through the suction port of the suction line, thereby causing aeration in the reservoir cup as well as problems such as miniaturization of fuel pump and durability reduction. There was a problem that caused.

In order to solve this problem, conventional efforts have been made to add a separate cup to the lower side of the jet valve or to form a U-shaped pipe. However, a separate member is formed at the outlet of the jet valve. In case of doing so, there was another problem such as deterioration of suction ability.

Therefore, the present invention has been made to solve the above problems, in the saddle type fuel tank in which the fuel storage space is divided into the main tank and the sub tank, when the amount of fuel stored in the sub tank is small, the suction line connected to the sub tank It is an object of the present invention to provide a suction shutoff device for a saddle fuel tank to prevent air from being sucked through the inlet of the fuel cell.

The present invention as a means for achieving the above object,

In the saddle-type fuel tank in which the main tank and the sub tank is formed separately, and a pipe-shaped suction line is formed to allow the fuel in the sub tank to be guided to the main tank side.

A chamber having a predetermined volume provided on the suction side of the suction line located in the sub tank;

A valve seat provided in the middle of the chamber to define an upper and lower portions, and a valve hole communicating with the upper and lower portions in the middle thereof;

A valve positioned below the valve seat for closing the valve hole during the ascending operation and opening the valve ball during the descending operation;                         

A float connected to the lower end of the valve by a rod so that the up and down operation of the valve can be linked with the amount of fuel in the sub tank; Characterized in that comprises a.

Hereinafter, a preferred embodiment according to the configuration and operation of the saddle fuel tank formed by the present invention will be described in detail with the accompanying drawings.

1 is a configuration diagram of a saddle-type fuel tank according to the present invention, Figure 2 is an enlarged cross-sectional view of the suction cutoff device according to the present invention, Figure 3 is a view showing an operating state diagram of the suction cutoff device according to the present invention.

Reference numeral 20 shown in the drawing indicates a suction cutoff device formed by the present invention, and reference numerals related to the fuel tank to which the suction cutoff device is applied are referred to as symbols used in the description of the prior art.

The fuel tank 10 is a saddle type fuel tank divided into a main tank 11 and a sub tank 12 based on an intermediate portion as described in the description of the prior art, and stored on the sub tank 12 side. A suction line 14 is formed between the sub tank 11 and the main tank 12 so that fuel can be transferred to the main tank 11 side.

In particular, a suction cut-off device for blocking the suction side of the suction line 14 when there is no fuel flowing into the suction line 14 during the suction side of the suction line 14 positioned in the sub tank 12 ( 20) is formed.

A chamber 21 having a predetermined volume is formed in the middle of the suction side of the suction line 14 for the configuration of the suction shutoff device 20, and by the operation of the valve 24 in the middle of the chamber 21. A valve seat 22 is formed to allow flow to be blocked.

The valve seat 22 divides the space of the chamber 21 into upper and lower portions, and a valve hole 23 is formed therethrough so that the upper space 21a and the lower space 21b can communicate with each other. . The side cross-sectional shape of the valve seat 22 is formed to be inclined toward the upper side as shown in the figure, so that the valve hole 23 can be opened and closed more effectively by the valve 24.

The valve 24 has a spherical head portion 25 is integrally formed on the cylindrical body in accordance with the size of the valve hole (23). On the other hand, the lower end of the body of the valve 24 is connected to the rod 26, the lower end of which is exposed to the outside of the chamber 21.

The lower end of the rod 26 is linked by the rod 26 with the sender arm 28 of the float 27 provided in the sub tank 12. The sender arm 28 is rotatably coupled to the fixed side of the tank by a hinge 29, and thus the position of the float 27 varies depending on the amount of fuel stored in the sub tank 12. The valve 24 is configured to be shanghaidong.

On the other hand, between the lower end of the valve 24 and the lower surface of the chamber 21 is interposed a spring 30 surrounding the outer periphery of the rod 26, the valve 24 is applied to the elastic force of the spring 30 By force to the upper side.

Since the lower end of the suction pipe 14a connected to the lower surface of the chamber 21 of the suction blocker 20 is bent in a direction parallel to the lower surface of the sub tank 12, more efficient intake of fuel can be achieved. It is configured to be.

The operation state of the suction cutoff device configured as described above is made as follows.

When the engine is started and the fuel pump 13 is driven, the fuel of the fuel tank 10 is consumed earlier than the main tank 11 side by the action of the jet valve 17. As described in the description of the prior art.

In this process, the suction side of the suction line 14 connecting the space between the main tank 11 and the sub tank 12 is opened or closed by the suction cut-off device 20.

First, when sufficient fuel is stored in the sub tank 12, the fuel in the sub tank 12 is moved to the main tank 11 side through the suction line 14. In this process, the float 27 floats by the fuel in the sub tank 12, and the rod 26 and the valve 24 are moved downward by the hinge 29 as a starting point. Therefore, the valve hole 23 of the valve seat 22 is allowed to flow fuel to the cushion line 14 away from the valve 24.

On the contrary, as the fuel amount in the sub tank 12 decreases, the float 27 moves downward while the rod 26 and the valve 24 move upward from the hinge 29. In this process, since the valve hole 23 of the valve seat 22 is closed by the valve 24, the flow of fuel and air to the suction line 14 is blocked. Therefore, even if there is no fuel in the sub tank 12, the inflow of air to the suction line 14 is blocked, and aeration is prevented from occurring on the inlet side of the suction line 14.

On the other hand, since the spring 30 is mounted on the outer circumference of the rod 26 connected to the lower end of the valve 24, the valve 24 is in a state of being elastically supported upward.

The present invention constituted as described above is blocked when the sub tank runs out of fuel because the blocking device provided on the intake side of the suction line for guiding the fuel to move from the sub tank side of the saddle fuel tank to the main tank side. In this case, the aeration is prevented from occurring at the suction port of the suction line, which is a great advantage that can be more advantageous in terms of noise and durability generated in the fuel pump.

Claims (5)

In the saddle-type fuel tank in which the main tank and the sub tank is formed separately, and a pipe-shaped suction line is formed to allow the fuel in the sub tank to be guided to the main tank side. A predetermined volume chamber 21 provided on the suction side of the suction line 14 located in the sub tank 12; A valve seat 22 provided in the middle of the chamber 21 and bordering the upper and lower parts, and a valve hole 23 formed therein for communicating the upper and lower parts; A valve 24 positioned below the valve seat 22 to close the valve hole 23 in the ascending operation and to open the valve hole 23 in the descending operation; A float (27) connected to the lower end of the valve (24) by a rod (26) and a sender arm (28) so that the up and down operation of the valve (24) can be linked with the amount of fuel in the sub tank (12); Suction intermittent device of the saddle-type fuel tank, characterized in that comprising a. The method of claim 1, Suction control device of the saddle-type fuel tank, characterized in that the sender arm (28) of the float (27) is mounted so that the middle thereof is rotatable by the hinge (29) on the fixed side. The method according to claim 1 or 2, Saddle type, characterized in that between the rod 26 is connected to the lower side of the valve 24 and the lower wall of the chamber 21 interposed spring 30 for supporting the valve 24 upwardly elastic Suction chopper of fuel tank. The method of claim 1, The lower end of the suction pipe (14a) connected to the lower side of the chamber 21 is bent in the saddle fuel tank, characterized in that bent in the direction parallel to the bottom surface of the sub tank (12). The method of claim 1, The valve 24 is formed in a cylindrical shape with a long length in the vertical direction, the head portion 25 is a suction intermittent device of the saddle-type fuel tank, characterized in that formed in a spherical shape.

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