KR100695971B1 - Tilt sensitive fuel cut valve and fuel pump - Google Patents

Abstract

 The present invention is to provide a gradient sensitive fuel cutoff valve and a fuel pump excellent in compactness and excellent fuel cutoff capability.

To this end, in the inclined sensitive fuel cutoff valve which closes the fuel passage of a large engine by the ball valves 35 and 37 which are displaced from the valve open position to the valve closed position in response to the inclination, the fuel inlet and the fuel outlet have a cylindrical shape. It is formed on the inner surface of the large pipe | tube 34 and 36 which communicates with a flow path, the ball valves 35 and 37 accommodated in the large pipe | tube 34 and 36, and the large pipe | tube 34 and 36, and is recessed in groove shape. At least one auxiliary passage 81 extending in the flow direction is provided.

Description

 Tilt SENSITIVE FUEL CUT VALVE AND FUEL PUMP}

 1 is a cross-sectional view showing an arrangement example of a fuel pump having a gradient sensitive fuel shutoff valve according to the present invention;

2 is a partially broken cross-sectional view showing a configuration of a fuel pump;

3 is a view schematically showing a fuel cutoff function by a fuel shutoff valve at an incline;

Figure 4 is an enlarged cross-sectional view showing the structure of the valve seat portion of the inclined fuel shutoff valve according to the present invention;

Figure 5 is an enlarged cross-sectional view showing the structure of the valve seat portion of the inclined fuel shutoff valve according to the prior art,

6 is a view showing an example of a cross-sectional structure in the B-B line of FIG.

7 is a view showing a cross-sectional structure at a position corresponding to FIG. 6 of the prior art.

 BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a gradient sensitive fuel shutoff valve and a fuel pump that cut off fuel supply from a fuel tank to a fuel injection device in response to the inclination of a vehicle. The present invention relates to a gradient sensitive fuel shutoff valve for closing a fuel passage with a ball valve and a fuel pump in which the valve is integrally formed.

A fuel supply device for an automatic two-wheeled vehicle having a fuel injection device (injector) includes a fuel pump for pressurizing and supplying fuel to the fuel injection device, and shuts off fuel supply to the fuel injection device when the vehicle is inclined beyond a reference angle. A fuel shutoff valve is included.

Patent Literature 1 discloses a technique of monitoring the inclination of a vehicle by an electric sensor and cutting off the power supply to the fuel pump or the ignition device when the inclination is detected. Patent Literature 2 discloses a liquid shutoff valve device having a float chamber accommodated in a fuel tank and raising the float by buoyancy of fuel when the vehicle body is inclined to shut off the fuel passage.

[Patent Document 1]

JP 55-1530

[Patent Document 2]

Japanese Patent Application Laid-Open No. 10-205634

Patent document 1 consumes electric power of a battery because it uses an electrical sensor. Therefore, a mechanical system that does not consume power has been desired. In Patent Literature 2, not only the float chamber that requires a relatively large volume must be equipped, but also the float chamber must be accommodated in the fuel tank, so that restrictions on the arrangement of the shutoff valves and the structure of the fuel tank are increased.

 It is an object of the present invention to provide a gradient sensitive fuel shutoff valve and a fuel pump that are compact and have excellent fuel cutoff capability without consuming power.

 SUMMARY OF THE INVENTION The present invention is characterized by the following measures in the inclined sensitive fuel shutoff valve and fuel pump which close the fuel passage with a ball valve displaced from the valve open position to the valve closed position in response to the inclination.

(1) The inclined sensitive fuel cutoff valve of the present invention is provided on a large engine for communicating a fuel inlet and a fuel outlet to a cylindrical flow path, a ball valve accommodated in the large engine, and an inner surface of the large engine, And at least one auxiliary passageway concave into a groove shape and extending in the flow path direction.

(2) The ball valve is characterized by being a high polymer having elastic recovery properties, for example, made of rubber.

(3) A lip valve seat is formed at the edge portion of the flow path side of the fuel outlet.

(4) The fuel pump of the present invention is characterized by integrally forming a gradient sensitive fuel shutoff valve.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional view showing an arrangement example of a fuel pump including a gradient sensitive fuel cutoff valve according to the present invention.

The fuel pump 10 is supported by the upper surface of the fuel tank 20 in the flange part 11 provided in the upper part, The main part is accommodated in the fuel tank 20. As shown in FIG. The fuel pump 10 includes a relief pressure regulating valve 30 which suppresses a pressure increase in the fuel passage, first and second fuel shutoff valves 31 and 32 which close the valve in response to the inclination, and a residual pressure retention. Check valve 33 is integrally formed, and in each of the large pipes 34 and 36 of the first and second fuel shutoff valves 31 and 32, a high polymer having elastic recovery properties, for example, Rubber ball valves 35 and 37 are housed.

A suction pipe (not shown) provided at the bottom of the fuel pump 10 is equipped with a strainer 12, and the fuel sucked through the strainer 12 is a pressure control valve 30 and a first fuel shutoff valve 31. ), The second fuel shutoff valve 32 and the check valve 33, the fuel pipe (supplied to the discharge pipe 45 (see Fig. 2), and connected to the discharge pipe 45 via the coupler 14 again ( It is supplied to the injector via 15).

2 is a partially broken cross-sectional view showing the configuration of the fuel pump 10.

The first and second fuel shutoff valves 31 and 32 are connected in series via the communication path 43, and both the major engines 34 and 36 are refracted by a predetermined angle. The fuel sucked from the suction pipe (not shown) via the strainer 12 is pumped to the upper portion of the pump body 16 by pump functions (not shown) such as a drive motor and an impeller built in the pump body 16. Suction or pressure is then introduced into the first fuel shutoff valve 31 via the fuel passage 41, the communication passage 42 and the pressure regulating valve 30.

If the vehicle is in the upright position, in the first large engine 34 of the first fuel shutoff valve 31, since the ball valve 35 stays at the valve open position of the upstream end, the first fuel shutoff valve 31 The fuel introduced into is introduced into the second fuel shutoff valve 32 via the first large engine 34 and the communication path 43.

If the vehicle is also upright, the second fuel cutoff valve 32 is located in the second large engine 36 of the second fuel cutoff valve 32 because the ball valve 37 stays at the valve opening position of the upstream end. The fuel introduced into the injector is supplied to the injector via the second large engine 36, the communication passage 44, the check valve 33, and the discharge pipe 45.

3 is a diagram schematically showing the function of the fuel shutoff valves 31 and 32. If the vehicle is in an upright position (FIG. 3A), since the ball valve 35 in the first large engine 34 and the ball valve 37 in the second large engine 36 are both in the valve open position, the communication path The fuel supplied from the 42 to the pressure regulating valve 30 connects the first large engine 34, the communication path 43, the second large engine 36, the communication path 44 and the check valve 33. Via the discharge pipe 45 to the injector via.

When the vehicle is inclined greatly beyond the limit angle [theta] max to the left [Fig. 3 (b)] or the right [Fig. 3 (c)], the first large engine 34 or the second large engine 36 is approximately As the ball valves 35 and 37 move horizontally, the ball valves 35 and 37 are displaced to the valve closing position by inertial force and are seated at the valve seat. In this case, the fuel passage is blocked. Therefore, fuel injection is prevented when the vehicle is inclined greatly beyond the limit angle [theta] max.

FIG. 4 is an enlarged cross-sectional view showing the structure of the valve seat portion of the first fuel shutoff valve 31 surrounded by the dashed round frame A in FIG. 2, and FIG. 5 shows the structure in the prior art of the same portion. It is an enlarged cross section. In addition, although not shown, the valve seat portion of the second fuel shutoff valve 32 is also configured similarly to FIG. 4.

In the prior art of FIG. 5, the communication path 43 is arranged concentrically with the first large engine 34. On the other hand, in one embodiment of the present invention shown in FIG. 4, the communication path 43 is eccentrically opened in the downward direction when the vehicle is inclined with respect to the large engine 34, and the edge portion of the opening 60 is looped. The shape is also raised to an acute angle to form a lip structure 61.

Thus, in this embodiment, not only the opening of the communication paths 43 and 44 connected to the valve seat part of the large pipe | tube 34, 36 is eccentric in the downward direction at the time of vehicle inclination, but the opening 60 is Since the valve seat formed in an annular shape at the edge of the lip structure 61 has a lip structure and the ball valve is made of rubber, the adhesion between the ball valve and the opening of the communication path is improved, and the fuel cutoff capability at the time of vehicle inclination is improved. do.

6 (a) and 6 (b) are diagrams showing an example of the cross-sectional structure of the large engine 34 in the BB line of FIG. 2, and FIG. 7 is a cross section at the corresponding position in the prior art. The figure shows the structure. Although not shown, the corresponding part of the second large engine 36 is similarly configured.

In the first embodiment shown in Fig. 6 (a), four concave recesses are formed in the inner surfaces of the large organs 34 and 36 in a groove shape along the axial direction of the large organ 34 at equal intervals along the circumferential direction thereof. Auxiliary fuel passages 81 (81a, 81b, 81c, 81d) are provided. Similarly in the second embodiment shown in FIG. 6 (b), three auxiliary fuel passages 81 (81e, 81f, 81g) recessed in a groove shape along the axial direction on the inner surfaces of the large engines 34, 36; Is installed.

In addition, each of the auxiliary fuel passages 81 is formed only on a side from one end side (upstream side) where the ball valve stays at the valve opening to an approximately intermediate point, and the other end side (downstream side) where the ball valve is seated when the valve is closed. ) And its vicinity are not formed.

As described above, in the present embodiment, the auxiliary fuel passage 81 recessed in the groove shape along the axial direction on the inner surfaces of the large engines 34 and 36 is seated when the ball valves 35 and 37 are closed. Since it is provided only on the side surface except the downstream side and its vicinity, compared with the prior art shown in FIG. 6, the ball valves 35 and 37 are not enlarged in the valve seat part without expanding the inner diameter of the large engine 34, 36. The fuel flow path can be enlarged while the) stays at the valve opening position.

 According to this invention, the following effects are achieved.

(1) Fuel passage secured in the clearance between the inner surface of the large engine and the ball valve without increasing the inner diameter near the valve seat position of the large engine by providing an auxiliary fuel path in the large engine of the inclined sensitive fuel shutoff valve. Can increase the cross-sectional area.

(2) Since the ball valve is made of rubber, the closing capability by the ball valve can be improved.

(3) Since the valve seat portion of the inclination-sensitive fuel shutoff valve has a lip structure, the closing capability by the ball valve can be improved.

(4) Since the fuel pump and the inclination-sensitive fuel shut-off valve are integrated, the joint tube and the clamp member, which are necessary for connecting the two when the parts are different parts, are unnecessary.

Claims (10)

 In a gradient sensitive fuel cutoff valve for closing a fuel passage with a ball valve which is displaced from a valve opening position to a valve closing position in response to an inclination, A large engine for communicating the fuel inlet and the fuel outlet to a cylindrical flow path, A ball valve accommodated in said large engine, At least one auxiliary passage formed on an inner surface of said large organ and recessed in a groove shape and extending in a flow path direction; An annular valve seat formed at an edge of the flow path side of the fuel outlet, The auxiliary passage is formed extending from the side of one end of the large engine that the ball valve stays at the valve opening in the flow path direction, to reach the other end of the large engine seated when the ball valve is closed Slope sensitive fuel cutoff valve, characterized in that formed only before.  The method of claim 1, And the ball valve is a high polymer having elastic resilience.  The method according to claim 1 or 2, And the annular valve seat is raised at an acute angle.  The method of claim 3, And the annular valve seat has a lip structure.  The method according to any one of claims 1 to 4, 2. The gradient sensitive fuel shutoff valve according to claim 2, wherein two of the large engines are connected in series and refracted by a predetermined angle.  In the fuel pump in which the inclination-sensitive fuel shut-off valve integrally closes the fuel passage by a ball valve displaced from the valve opening position to the valve closing position in response to the inclination, A large engine for communicating the fuel inlet and the fuel outlet to a cylindrical flow path, A ball valve accommodated in said large engine, At least one auxiliary passage formed on an inner surface of the large organ and recessed in a groove shape and extending in a flow path direction; An annular valve seat formed at an edge of the flow path side of the fuel outlet, The auxiliary passage is formed along the flow path direction from the side of one end of the large engine in which the ball valve stays upon opening the valve, until the ball valve reaches the other end of the large engine seated when the valve is closed. Fuel pump, characterized in that formed only.  The method of claim 6, A fuel pump, characterized in that the ball valve is a high polymer having elastic recovery.  The method according to claim 6 or 7, A fuel pump, characterized in that the annular valve seat is raised at an acute end.  The method of claim 8, And the annular valve seat has a lip structure.  The method according to any one of claims 6 to 9, And two of said large engines are connected in series and refracted by a predetermined angle.

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