CN100398806C - Tilt Sensing Fuel Shutoff Valve and Fuel Pump - Google Patents

Abstract

The present invention provides a tilt-sensing type fuel shutoff valve and a fuel pump that are small in size and have excellent fuel shutoff capability. In the tilt-sensing type fuel cut-off valve that senses tilt and uses the ball valve (35 (37)) that displaces from the valve opening position to the valve closing position to block the fuel passage of the holding pipe, it is provided that the fuel is communicated with the cylindrical flow channel. A retaining tube (34(36)) for the inlet and fuel outlet; a ball valve (35(37)) housed in the retaining tube (34(36)); at least one auxiliary channel (81) formed in the retaining tube (34( 36)) The inner side surface is concave in the shape of a groove and extends along the direction of the flow channel.

Description

Tilt Sensing Fuel Shutoff Valve and Fuel Pump

technical field

The present invention relates to a tilt-sensing type fuel cut valve (cut valve) and a fuel pump that senses the tilt of a vehicle and cuts off the fuel supply from a fuel tank to a fuel injection device, and particularly relates to a tilt-sensing and utilizing displacement from an open valve position to a closed valve position. A tilt-sensing type fuel shutoff valve in which a ball valve of a valve position blocks a fuel passage and a fuel pump integrally formed with the valve.

Background technique

In a fuel supply device for a two-wheeled vehicle having a fuel injection device (injector), a fuel pump for pressurizing fuel and supplying it to the fuel injection device; a fuel cutoff valve for tilting the vehicle beyond a reference angle , the fuel supply to the fuel injection device is cut off.

Patent Document 1 discloses a technique of monitoring the inclination of a vehicle with an electric sensor, and shutting off power supply to a fuel pump and an ignition device when the inclination is detected. Patent Document 2 discloses a liquid shutoff valve (shutoff valve) device that has a float chamber accommodated in a fuel tank, and when the vehicle body is tilted, the buoyancy of the fuel is used to raise the float to shut off the fuel passage. .

[Patent Document 1] Publication No. 55-1530, Publication No. 55-1530

[Patent Document 2] Japanese Unexamined Patent Publication No. 10-205634

Since Patent Document 1 uses an electric sensor, the electric power of the storage battery is consumed. Therefore, it is desirable to have a mechanical system that consumes no power. In Patent Document 2, not only must the float chamber requiring a large volume be installed, but also the float chamber must be accommodated in the fuel tank, so the restrictions on the arrangement of the shutoff valve and the structure of the fuel tank become large.

Contents of the invention

An object of the present invention is to provide a tilt-sensing type fuel shutoff valve and a fuel pump that do not consume electric power, are small in size, and have excellent fuel shutoff capability.

The present invention is an inclination-sensing type fuel cut-off valve and a fuel pump which block a fuel passage with a ball valve displaced from an open position to a closed position in response to inclination, and are characterized in that the following methods are employed.

(1) The tilt-sensing type fuel stop valve of the present invention is characterized in that it includes: a holding pipe (standby pipe) connecting the fuel inlet and the fuel outlet with a cylindrical flow path; a ball valve housed in the holding pipe; at least one auxiliary valve; The channel, formed on the inner surface of the holding tube, is recessed in the shape of a groove and extends along the direction of the flow channel.

(2) It is characterized in that the ball valve is a high polymer with elastic recovery, such as a rubber product.

(3) It is characterized in that a lip-shaped valve seat is formed on the side edge of the flow path of the fuel outlet.

(4) The fuel pump of the present invention is characterized in that a tilt-sensitive fuel shutoff valve is integrally formed.

According to the present invention, the following effects can be achieved.

(1) Since the auxiliary fuel passage is provided in the retaining pipe of the tilt-sensing type fuel stop valve, it is possible to increase the gap between the inner surface of the retaining pipe and the ball valve without increasing the inner diameter of the retaining pipe in the vicinity of the seat position. Ensure the cross-sectional area of the fuel passage.

(2) Since the ball valve is made of rubber, it is possible to improve the shutoff capacity based on the ball valve.

(3) Since the valve seat portion of the tilt-sensing type fuel cut-off valve is made into a lip-shaped structure, it is possible to improve the shutoff capability of the ball valve.

(4) Since the fuel pump and the tilt-sensing type fuel shutoff valve are integrated, there is no need for a connecting pipe and a clamping member which are necessary for connecting the two when they are separately used.

Description of drawings

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

Fig. 2 is a partially broken sectional view showing the structure of a fuel pump.

Fig. 3 is a schematic diagram showing a fuel cutoff function by a fuel cutoff valve during inclination.

Fig. 4 is an enlarged cross-sectional view showing the structure of the valve seat portion of the fuel cutoff valve during inclination according to the present invention.

Fig. 5 is an enlarged cross-sectional view showing the structure of a valve seat portion of a conventional fuel cutoff valve during inclination.

Fig. 6 is a diagram showing an example of a cross-sectional structure taken along line B-B in Fig. 2 .

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

Detailed ways

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

The flange part 11 provided on the upper part of the fuel pump 10 is supported on the upper part of the fuel tank 20 , and the main part of the fuel pump 10 is accommodated in the fuel tank 20 . The fuel pump 10 is integrally formed with: a pressure relief (relief) pressure regulating valve 30 for controlling the pressure rise in the fuel passage; first and second fuel cut-off valves 31 and 32 for sensing tilt and closing the valve; The check valve (one-way valve) 33, in each of the holding pipes 34, 36 of the first and second fuel cut-off valves 31, 32, is accommodated with a high polymer with elastic recovery, such as a ball valve made of rubber. 35, 37.

A filter 12 is attached to a suction pipe (not shown) provided at the bottom of the fuel tank 10, and the fuel sucked through the filter 12 passes through the pressure regulating valve 30, the first fuel stop valve 31, the second fuel The stop valve 32 and the check valve 33 are supplied to the delivery pipe 45 (see FIG. 2 ), and are supplied to the injectors via the fuel pipe 15 connected to the delivery pipe 45 via the coupling 14 .

FIG. 2 is a partially broken sectional view showing the structure of the fuel pump 10 .

The first and second fuel shutoff valves 31, 32 are connected in series through the communication passage 43, and the holding pipes 34, 36 of both are bent only at a predetermined angle. The fuel sucked from the suction pipe (not shown) through the filter 12 is sucked by the pump function part (none of which is shown) such as a drive motor and an impeller built in the pump body 16 or pressurized and sent to the upper part of the pump body 16, and then passed through The fuel passage 41 , the communication passage 42 and the pressure regulating valve 30 are introduced into the first fuel shutoff valve 31 .

If the vehicle maintains an upright posture, the ball valve 35 stays at the valve opening position at the upstream end in the first holding pipe 34 of the first fuel cutoff valve 31, so the fuel introduced into the first fuel cutoff valve 31 passes through the first holding pipe. 34 and the communication passage 43 are introduced into the second fuel stop valve 32 .

Here, if the vehicle maintains an upright posture, the ball valve 37 stays at the valve opening position at the upstream end in the second holding pipe 36 of the second fuel shutoff valve 32, so the fuel introduced into the second fuel shutoff valve 32 passes through the second fuel shutoff valve 32. 2 The holding pipe 36, the connecting passage 44, the check valve 33 and the outlet pipe 45 supply the injector.

FIG. 3 is a schematic diagram showing the functions of the fuel shutoff valves 31 and 32. If the vehicle maintains an upright posture [Fig. 3(a)], the ball valve 35 in the first holding pipe 34 and the ball valve 37 in the second holding pipe 36 are all in the valve open position, so the pressure is supplied from the connecting passage 42 to the pressure regulating valve 30. The fuel is supplied from the output pipe 45 to the injector via the first holding pipe 34 , the communication passage 43 , the second holding pipe 36 , the communication passage 44 , and the check valve 33 .

When the vehicle tilts to the left (Fig. 3(b)) or rightward (Fig. 3(c)) beyond the critical angle θmax and tilts considerably, the first holding pipe 34 or the second holding pipe 36 turns left and right until it is approximately horizontal , At the same time, the ball valves 35, 37 are displaced to the closed valve position due to inertial force and seated on the valve seat, which can block the fuel passage under any circumstances. Therefore, when the vehicle is inclined beyond the critical angle θmax, the fuel injection is cut off.

4 is an enlarged cross-sectional view showing the structure of the valve seat portion of the first fuel shutoff valve 31 surrounded by a dotted circle in FIG. 2, and FIG. 5 is an enlarged cross-sectional view showing the structure of this portion in the prior art. In addition, although illustration is omitted, the valve seat portion of the second fuel shutoff valve 32 also has the same structure as that of FIG. 4 .

In the prior art shown in FIG. 5 , the communication channel 43 is arranged concentrically with the first holding pipe 34 . On the other hand, in one embodiment of the present invention shown in FIG. 4 , the communication channel 43 is eccentrically opened with respect to the holding pipe 34 in a direction downward when the vehicle is tilted, and the edge of the opening 60 has a shape of It is ring-shaped and its front end protrudes at an acute angle to form a lip structure 61 .

In this way, in the present embodiment, not only the openings of the communication passages 43 (44) connected to the valve seat portions of the holding pipes 34 and 36 are eccentric to the lower side when the vehicle is tilted, but also the edges of the openings 60 are The ring-shaped valve seat is a lip structure 61, and because the ball valve is made of rubber, the tightness between the ball valve and the opening of the communication channel is improved, and the fuel shutoff capability when the vehicle is tilted is improved.

6( a ), ( b ) are diagrams showing an example of the cross-sectional structure of the holding pipe 34 along the line B-B in FIG. 2 , and FIG. 7 is a diagram showing the cross-sectional structure at this position in the prior art. In addition, although illustration is omitted, this part of the second holding pipe 36 also has the same structure.

In the first embodiment shown in FIG. 6( a ), on the inner surface of the holding tube 34 ( 36 ), there are four groove-like recesses at equal intervals along its circumferential direction and in the axial direction of the holding tube 34 . Auxiliary fuel passages 81 (81a, 81b, 81c, 81d). Also in the second embodiment shown in FIG. 6( b ), three auxiliary fuel passages 81 ( 81 e , 81 f ) are provided on the inner surface of the holding pipe 34 ( 36 ) and are recessed in a groove shape along the axial direction. , 81g).

In addition, each of the auxiliary fuel passages 81 is formed only on the side surface from one end side (upstream side) where the ball valve stays when the valve is opened to a substantially intermediate point, and is not formed on the other end side (downstream side) where the ball valve is seated when the valve is closed. ) and its nearby sides.

In this way, in this embodiment, since the inner surface of the holding pipes 34, 36, the auxiliary fuel passage 81 recessed in a groove shape along its axial direction is only provided on the downstream side and the other side where the ball valves 35, 37 are seated when they are closed. Therefore, compared with the prior art shown in FIG. 7 , it is not necessary to enlarge the inner diameters of the retaining pipes 34, 36 at the valve seat portion, and it is possible to enlarge the space for the ball valves 35, 37 to stay in the valve-opening position. fuel runner.

Claims (9)

1. An inclination-sensing fuel cut-off valve, which senses inclination and utilizes a ball valve displaced from an open valve position to a closed valve position to block a fuel channel, comprising: The retaining tube connects the fuel inlet and the fuel outlet with a cylindrical flow channel; a ball valve housed in the holding tube; At least one auxiliary channel, formed on the inner surface of the holding tube, is recessed in a groove shape and extends along the direction of the flow channel; An annular valve seat is formed on the side edge of the flow path of the fuel outlet. 2. The tilt-sensing fuel cut-off valve according to claim 1, wherein the ball valve is made of a high polymer having elastic recovery. 3. The tilt-sensing type fuel shutoff valve according to claim 1 or 2, wherein the annular valve seat has a front end protruding at an acute angle. 4. The tilt-sensing type fuel cut-off valve according to claim 3, said annular valve seat is a lip-shaped structure. 5. A fuel pump, integrally formed with a tilt-sensing fuel shut-off valve that senses tilt and uses a ball valve displaced from an open valve position to a valve-closed position to block the fuel passage, the tilt-sensing fuel shut-off valve comprising: The retaining tube connects the fuel inlet and the fuel outlet with a cylindrical flow channel; a ball valve housed in the holding tube; At least one auxiliary channel, formed on the inner surface of the holding tube, is recessed in the shape of a groove and extends along the direction of the flow channel; An annular valve seat is formed on a flow path side edge of the fuel outlet. 6. The fuel pump according to claim 5, wherein the ball valve is a high polymer with elastic recovery. 7. The fuel pump according to claim 5 or 6, wherein a front end of the annular valve seat protrudes at an acute angle. 8. The fuel pump of claim 7, wherein the annular valve seat is a lip structure. 9 . The fuel pump according to claim 5 , comprising two tilt-sensing fuel shutoff valves, and holding pipes of the two tilt-sensing fuel shutoff valves are connected in series and bent only at predetermined angles.

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