JP7118703B2 - fuel supply - Google Patents

Description

This specification discloses a technology related to a fuel supply device that supplies fuel to an internal combustion engine.

Patent Document 1 discloses a fuel supply device. A fuel supply device is provided with a pressure regulating valve that regulates the pressure of fuel discharged from a fuel pump. Excess fuel discharged from the pressure regulating valve is guided to the side surface of the filter by the fuel guide path.

JP 2013-221420 A

In the fuel supply system, a reserve cup is installed near the intake port of the fuel pump so that the fuel pump can draw in fuel even when the amount of fuel stored in the fuel tank is reduced. When the amount of fuel in the reserve cup decreases, a situation may arise in which the fuel pump cannot stably draw in fuel.

The present specification provides a technique capable of suppressing reduction of fuel in the reserve cup.

The technology disclosed by this specification relates to a fuel supply device. The fuel supply device includes a fuel pump arranged in a fuel tank, a filter attached to an intake port of the fuel pump, a reserve cup housing at least part of the filter, and a fuel discharged from the fuel pump. a pressure regulator that delivers part of the fuel supplied into the fuel tank; and a guide section that guides the fuel delivered from the pressure regulator into the fuel tank to the filter and the reserve cup, wherein the pressure regulator and the guide portion extending from toward the filter and the reserve cup, and the filter and the reserve cup are arranged on an extension line.

In this configuration, the fuel discharged from the pressure regulator to the fuel tank, that is, the surplus fuel is discharged toward the filter and the reserve cup from the extended line of the filter and the reserve cup. As a result, fuel is supplied to the filter and also to the reserve cup. According to this configuration, by supplying fuel to the filter, the amount of fuel in the reserve cup sucked by the fuel pump can be suppressed. Furthermore, fuel can be supplied to the reserve cup by supplying fuel to the reserve cup. As a result, reduction of fuel in the reserve cup can be suppressed.

A pump cover that covers the outer circumference of the fuel pump and is arranged on the guide portion side of the reserve cup, the filter is arranged along the outer circumference of the pump cover, and the guide portion is , the fuel delivered from the pressure regulator into the fuel tank may be guided between the filter and the pump cover. According to this configuration, since surplus fuel is supplied between the filter and the pump cover, fuel can be supplied to at least one of the reserve cup and the filter even when the fuel tank is tilted. . As a result, reduction of fuel in the reserve cup can be suppressed.

The fuel pump may further include a first fuel pipe extending from the discharge port of the fuel pump toward the internal combustion engine, and the guide portion, the first fuel pipe, and the pressure regulator may be integrated. With this configuration, the number of parts for assembly can be reduced.

A second fuel pipe is inserted into the end of the first fuel pipe opposite to the fuel pump, and the inner diameter of the end of the first fuel pipe opposite to the fuel pump is equal to the fuel pump. The inner peripheral surface of the end of the first fuel pipe opposite to the fuel pump is provided with the fuel from the side opposite to the fuel pump. An inclined surface may be arranged that is inclined in a direction in which the inner diameter of the first fuel pipe is reduced toward the pump side. According to this configuration, the opening at the end of the first fuel pipe opposite to the fuel pump can be made larger than the inner diameter of the first fuel pipe at the intermediate position. This makes it easier to insert the second fuel pipe through the opening of the first fuel pipe. Further, by providing the inclined surface in the first fuel pipe, when the second fuel pipe is inserted into the first fuel pipe, the central axis of the second fuel pipe is offset from the central axis of the first fuel pipe. Even in this state, the second fuel pipe can be inserted into the first fuel pipe by correcting the axial deviation by abutting the second fuel pipe against the inner peripheral surface of the first fuel pipe.

further comprising an O-ring attached to the second fuel pipe and sandwiched between the first fuel pipe and the second fuel pipe; The distance to the inclined surface may be shorter than the distance from the end of the second fuel pipe on the first fuel pipe side to the O-ring. According to this configuration, when inserting the second fuel pipe into the first fuel pipe, even if the central axis of the second fuel pipe is deviated from the central axis of the first fuel pipe, the second fuel pipe The O-ring is inserted into the first fuel tube after the fuel tube abuts against the inner peripheral surface of the first fuel tube to correct the axial deviation. As a result, when the O-ring is inserted into the first fuel pipe, it is possible to prevent the O-ring from contacting the first fuel pipe and the second fuel pipe and being twisted or damaged.

The perspective view with the fuel supply apparatus of an Example is shown. The front view of the fuel supply apparatus of an Example is shown. 3 shows a cross-sectional view of the III-III cross section of FIG. 2 ; FIG. Fig. 4 shows a vertical cross-sectional view of a connecting portion of the first fuel pipe and the second fuel pipe of the embodiment;

(Example)
A fuel supply system 10 of the present embodiment will be described with reference to FIGS. 1 to 4. FIG. First, the fuel supply device 10 will be described with reference to FIGS. 1 and 2. FIG. The fuel supply device 10 is housed in the fuel tank of the motorcycle. In this embodiment, the vertical direction is defined by the direction shown in FIG. 1, but this direction does not limit the actual usage posture.

The fuel supply device 10 includes a fuel pump 12 , a lower cover 14 , an upper cover 16 , a pressure regulator 18 , a filter 30 and a liquid level detector 40 .

The fuel pump 12 rotates an impeller by a motor, sucks fuel into the fuel pump 12 through a suction port located at the lower end, raises the pressure of the fuel, and discharges the fuel from a discharge port located at the upper end. A pressure regulator 18 is connected to the discharge port. The pressure regulator 18 regulates the pressure of the fuel discharged from the discharge port and sends it to the engine. The pressure regulator 18 is integrally attached to the upper cover 16 .

The upper cover 16 covers the upper end of the fuel pump 12 . The upper cover 16 has a guide portion 50 and a first fuel pipe 52 . The guide portion 50 and the first fuel pipe 52 are integrally formed by resin molding. The guide portion 50 guides the fuel pressure-regulated by the pressure regulator 18 . The configuration of the guide portion 50 will be described later. A liquid level detector 40 is attached to the upper cover 16 in addition to the pressure regulator 18 . The liquid level detection section 40 includes a sensor support section 42 , a sensor (not shown), and a cover 44 . The sensor support portion 42 is attached to the upper cover 16 at its lower end. The sensor support portion 42 gradually tapers upward.

A sensor is attached to the upper end of the sensor support portion 42 . The sensor comprises a temperature sensor. The temperature detected when the sensor is immersed in fuel differs from that when it is not immersed in fuel. This detects whether the liquid level in the fuel tank is above or below the sensor.

The sensor and sensor support 42 are covered with a cover 44 . As a result, for example, when the vehicle shakes and the liquid surface of the fuel in the fuel tank shakes, even though the liquid surface of the fuel is below the sensor, the shake of the liquid surface causes the fuel to come into contact with the sensor. It is possible to avoid a situation in which the sensor makes an erroneous detection.

(Structure of first fuel pipe)
The first fuel pipe 52 communicates with the discharge port of the fuel pump 12 . The first fuel pipe 52 has a cylindrical shape. The first fuel pipe 52 is arranged between the outlet of the fuel pump 12 and the engine. The fuel pressure-regulated by the pressure regulator 18 flows through the first fuel pipe 52 toward the engine. The first fuel pipe 52 extends parallel to the vertical direction. FIG. 4 shows a cross section passing through the central axis of the first fuel pipe 52 and showing the lower end of the first fuel pipe 52, that is, the end opposite to the fuel pump 12. As shown in FIG.

At the lower end of the first fuel pipe 52, the inner diameter of the first fuel pipe 52 gradually increases toward the lower end. The first fuel pipe 52 has a plurality of inclined surfaces 54, 56, 58 on its inner peripheral surface. The sloping surface 58 is located at an opening 60 at the lower end of the first fuel tube 52 . The inclined surface 58 is inclined so that its diameter continuously decreases toward the fuel pump 12 side (that is, linearly in cross section).

The inclined surface 56 is arranged above the opening 60 at a distance D1. Between the sloping surface 58 and the sloping surface 56, the inner diameter of the first fuel tube 52 does not change and the first fuel tube 52 has a cylindrical shape. The inclined surface 58 is inclined so that its diameter continuously decreases toward the fuel pump 12 side (that is, linearly in cross section).

The inclined surface 54 is arranged at a position spaced upward from the inclined surface 56 . Between ramps 54 and 56, the inner diameter of first fuel tube 52 does not change by less than the inner diameter between ramps 58 and 56, and first fuel tube 52 is It has a cylindrical shape. The inclined surface 54 is inclined such that its diameter continuously decreases toward the fuel pump 12 side (that is, it is linear in cross section). Above the upper end of the inclined surface 54, the first fuel tube 52 has a constant inner diameter.

As shown in FIGS. 1 and 2, the lower end of fuel pump 12 is housed in lower cover 14 . The lower cover 14 includes a cover portion 70 , a reserve cup 72 , a second fuel pipe 74 and a nozzle 76 at the lower end of the fuel pump 12 . The cover portion 70, the reserve cup 72, the second fuel pipe 74, and the nozzle 76 are integrally produced by resin molding. The cover portion 70 has a substantially cylindrical shape arranged along the outer peripheral surface of the fuel pump 12 .

A second fuel pipe 74 connected to the lower end of the first fuel pipe 52 of the upper cover 16 is arranged outside the cover portion 70 . The second fuel pipes 74 are arranged in parallel in the vertical direction. The fuel that has passed through the first fuel pipe 52 passes through the second fuel pipe 74 . As shown in FIG. 4 , the second fuel pipe 74 is inserted into the first fuel pipe 52 . The second fuel tube 74 has a tip 80 . The tip portion 80 is arranged at the end of the second fuel pipe on the first fuel pipe 52 side. The upper end of tip 80 is slanted to reduce the outer diameter. The outer diameter of the tip portion 80 is smaller than the outer diameter of the second fuel tube 74 and the inner diameter of the tip portion 80 is the same as the inner diameter of the second fuel tube 74 . Thereby, a step is formed at the lower end of the tip portion 80 .

An O-ring 90 is arranged on the outer periphery of the lower end of the tip portion 80 . The O-ring 90 is positioned in contact with the step at the lower end of the tip portion 80 . A distance D2 from the upper end of the O-ring 90 to the upper end of the tip portion 80 is shorter than the distance D1.

When manufacturing the fuel supply device 10, the second fuel pipe 74 is inserted into the first fuel pipe 52 from below. The opening 60 of the first fuel tube 52 is larger than the inner diameter of the first fuel tube 52 at an intermediate position. This makes it easier to insert the second fuel pipe 74 through the opening 60 . The first fuel pipe 52 and the second fuel pipe 74 may tilt during resin molding. By providing the sloping surfaces 54 , 56 , 58 in the first fuel pipe 52 , when the second fuel pipe 74 is inserted into the first fuel pipe 52 , the central axis of the second fuel pipe 74 is aligned with the first fuel pipe 52 . Even if the second fuel pipe 74 contacts the inner peripheral surface of the first fuel pipe 52, the misalignment of the axis is corrected and the second fuel pipe 74 is displaced. It can be inserted into the first fuel tube 52 .

Also, the distance D2 from the upper end of the O-ring 90 to the upper end of the tip portion 80 is shorter than the distance D1. As a result, when inserting the second fuel pipe 74 into the first fuel pipe 52, even if the central axis of the second fuel pipe 74 is deviated from the central axis of the first fuel pipe 52, the The O-ring 90 is inserted into the first fuel tube 52 after the second fuel tube has abutted against the inclined surface 56 of the first fuel tube to correct the misalignment. As a result, when the O-ring 90 is inserted into the first fuel pipe 52, it is possible to prevent the O-ring 90 from contacting the first fuel pipe 52 and the second fuel pipe 74 and being twisted or damaged. .

Furthermore, the upper end of the second fuel pipe 74 is arranged at a position facing the inclined surface 54 . According to this configuration, even if the central axis of the second fuel pipe 74 is deviated from the central axis of the first fuel pipe 52, the contact of the upper end of the second fuel pipe 74 with the inclined surface 54 allows the second The central axis of the two fuel pipes 74 is corrected.

A nozzle 76 is connected to the lower end of the second fuel pipe 74 . The nozzle 76 is connected to a supply pipe communicating the fuel that has passed through the second fuel pipe 74 to the engine located outside the fuel supply device 10 .

A reserve cup 72 is arranged at the lower end of the cover portion 70 . The reserve cup 72 accommodates the intake port of the fuel pump 12 . A lower end portion of the filter 30 is accommodated in the reserve cup 72 . Filter 30 is connected to the intake of fuel pump 12 . The filter 30 is produced by laminating a plurality of nonwoven fabrics. Filter 30 is arranged along cover portion 70 . As shown in FIG. 3, a gap is provided between the filter 30 and the cover portion 70. As shown in FIG. The filter 30 removes foreign substances contained in the fuel by filtering the fuel sucked into the fuel pump 12 .

(Construction of guide part)
Next, the guide portion 50 will be described. As shown in FIG. 2, the guide portion 50 is arranged in front of the discharge port 18a of the pressure regulator 18 through which surplus fuel is discharged. The guide portion 50 is arranged in parallel with the vertical direction downward from the discharge port 18a. The guide portion 50 extends up to the upper end of the filter 30 . As shown in FIGS. 1 and 3 , the guide portion 50 includes guide walls 92 , 94 , 96 and 98 . The guide portion 50 is surrounded on all four sides by guide walls 92, 94, 96, and 98 in the vertical direction. In the guide portion 50 , the guide walls 92 , 94 , 96 , 98 define a channel with a square cross section.

The guide walls 92 and 94 have flat plate shapes spaced apart from each other. Guide walls 92 , 94 extend directly above filter 30 . The discharge port 18a is arranged in a gap between the guide walls 92 and 94. As shown in FIG.

A guide wall 96 closes the gap between the guide walls 92 , 94 at the end of the guide walls 92 , 94 opposite the pressure regulator 18 . The guide wall 96 has a flat plate shape. The guide wall 96 faces the discharge port 18a with a space therebetween. The guide wall 96 extends right above the filter 30 .

A guide wall 98 closes the gap between the guide walls 92 and 94 at the ends of the guide walls 92 and 94 on the side of the pressure regulator 18 . The guide wall 98 has a flat plate shape. The guide wall 98 is arranged below the discharge port 18a and faces the guide wall 96 with a space therebetween. The guide wall 96 extends right above the filter 30 . A lower end of the guide portion 50 is open.

On the extension line of the flow path defined by the guide walls 92, 94, 96, and 98, that is, below, there are a portion of the filter 30 on the cover portion 70 side, a gap between the filter 30 and the cover portion 70, and a reserve cup 72. are placed. Furthermore, a connecting portion 200 between the filter 30 and the fuel pump 12 is arranged on an extension of the flow path defined by the guide walls 92, 94, 96, 98. As shown in FIG.

A filter holder 100 is arranged parallel to the guide wall 92 outside the guide wall 92 . The filter holding part 100 has a flat plate shape. The filter holding portion 100 is integrally molded with the upper cover 16 by resin molding. The filter holding portion 100 is arranged above the surface of the filter 30 opposite to the cover portion 70 . The filter holding portion 100 is arranged at a position overlapping the upper end portion of the filter 30 in the vertical direction. For example, when the vehicle is tilted, the filter holding part 100 prevents the filter 30 from falling due to contact with the tilted filter 30 .

(effect)
Fuel discharged from the discharge port 18a of the pressure regulator 18 into the fuel tank, that is, surplus fuel is discharged toward the filter 30 and the reserve cup 72 from above the filter 30 and the reserve cup 72 by the guide portion 50 . As a result, fuel is supplied to the filter 30 and also to the reserve cup 72 . According to this configuration, the amount of fuel in the reserve cup 72 sucked by the fuel pump 12 can be suppressed by supplying fuel to the filter 30 . Furthermore, fuel can be supplied to the reserve cup 72 by supplying fuel to the reserve cup 72 . As a result, reduction of fuel in the reserve cup 72 can be suppressed.

Further, the guide portion 50 guides the fuel delivered from the pressure regulator 18 into the fuel tank toward between the filter 30 and the cover portion 70 . According to this configuration, since surplus fuel is supplied between the filter 30 and the cover portion 70, even when the two-wheeled vehicle is tilted with respect to the horizontal direction and the fuel tank is tilted, the reserve cup 72 is and/or the filter 30 can be supplied with fuel. As a result, reduction of fuel in the reserve cup 72 can be suppressed.

The guide portion 50 , the first fuel pipe 52 and the pressure regulator 18 are integrated with the upper cover 16 . With this configuration, the number of parts for assembly can be reduced.

Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

(Modification)
(1) In the above embodiment, the fuel supply device 10 is arranged in the fuel tank of the two-wheeled vehicle. However, the fuel supply device 10 may be arranged in a vehicle other than a two-wheeled vehicle, such as a four-wheeled vehicle.

(2) In the above embodiment, the guide portion 50 guides the fuel delivered from the pressure regulator 18 into the fuel tank toward between the filter 30 and the cover portion 70 . However, the guide portion 50 may guide the fuel delivered from the pressure regulator 18 into the fuel tank directly above the filter 30 or toward the side of the filter 30 opposite to the cover portion 70 .

(3) The modes of the first fuel pipe 52 and the second fuel pipe 74 are not limited to those of the above embodiments. For example, the first fuel pipe 52 and the second fuel pipe 74 may be integrally formed by resin molding. In this case, the first fuel pipe 52 and the second fuel pipe 74 may be arranged either on the upper cover 16 or the lower cover 14 or separately from the upper cover 16 and the lower cover 14 . Further, the number of inclined surfaces of the first fuel pipe 52 is not limited to three, and may be one, two, or four or more. good.

(4) The distance D2 may be longer than the distance D1.

(5) In the technology disclosed in this specification, a fuel supply device having the following configuration is also novel and useful. That is, the fuel supply system includes a fuel pump arranged in a fuel tank, a first fuel pipe arranged between the fuel pump and the internal combustion engine, and a fuel pipe opposite to the fuel pump in the first fuel pipe. and a second fuel pipe inserted into an end on the side of the fuel pump, wherein the inner diameter of the end of the first fuel pipe opposite the fuel pump extends from the end opposite the fuel pump to the fuel pump side. on the inner peripheral surface of the end of the first fuel pipe opposite to the fuel pump, the first fuel pipe from the side opposite to the fuel pump toward the fuel pump. An inclined surface that is inclined in a direction in which the inner diameter of is reduced may be arranged.

According to this configuration, the opening at the end of the first fuel pipe opposite to the fuel pump can be made larger than the inner diameter of the first fuel pipe at the intermediate position. This makes it easier to insert the second fuel pipe through the opening of the first fuel pipe. Further, by providing the inclined surface in the first fuel pipe, when the second fuel pipe is inserted into the first fuel pipe, the central axis of the second fuel pipe is offset from the central axis of the first fuel pipe. Even in this state, the second fuel pipe can be inserted into the first fuel pipe by correcting the axial deviation by abutting the second fuel pipe against the inner peripheral surface of the first fuel pipe.

It should be noted that at least one of the "filter", "reserve cup", and "guide portion" may not be provided in the above configuration.

In the fuel supply device according to Modification (5) above, an O-ring attached to the second fuel pipe and sandwiched between the first fuel pipe and the second fuel pipe is further provided. The distance from the end of the first fuel pipe opposite to the fuel pump to the inclined surface is shorter than the distance from the end of the second fuel pipe on the first fuel pipe side to the O-ring. good too. According to this configuration, when inserting the second fuel pipe into the first fuel pipe, even if the central axis of the second fuel pipe is deviated from the central axis of the first fuel pipe, the second fuel pipe The O-ring is inserted into the first fuel tube after the fuel tube abuts against the inner peripheral surface of the first fuel tube to correct the axial deviation. As a result, when the O-ring is inserted into the first fuel pipe, it is possible to prevent the O-ring from contacting the first fuel pipe and the second fuel pipe and being twisted or damaged.

The technical elements described in this specification or in the drawings exhibit technical utility either singly or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technique illustrated in this specification or drawings can simultaneously achieve a plurality of purposes, and achieving one of them has technical utility in itself.

10: Fuel supply device 12: Fuel pump 14: Lower cover 16: Upper cover 18: Pressure regulator 18a: Discharge port 30: Filter 40: Liquid level detection unit 42: Sensor support unit 44: Cover 50: Guide unit 52: First Fuel pipes 54, 56, 58: Inclined surface 60: Opening 70: Cover portion 72: Reserve cup 74: Second fuel pipe 76: Nozzle 80: Tip portion 90: O-rings 92, 94, 96, 98: Guide wall 100: Filter holder

Claims (5)

a fuel pump disposed within the fuel tank;
a filter attached to an inlet of the fuel pump;
a reserve cup containing at least part of the filter;
a pressure regulator that delivers part of the fuel discharged from the fuel pump into the fuel tank;
A guide portion for guiding fuel sent from the pressure regulator into the fuel tank to the filter and the reserve cup, the guide portion extending from the pressure regulator toward the filter and the reserve cup, the guide portion in which the filter and the reserve cup are arranged;
a pump cover that covers the outer periphery of the fuel pump and is arranged on the guide portion side of the reserve cup ;
The guide section
a flat plate-shaped first guide wall facing the discharge port of the pressure regulator with a gap therebetween;
a flat plate-shaped second guide wall adjacent to the first guide wall;
a third guide wall facing the second guide wall across the first guide wall;
A flow path defined by each of at least the first guide wall, the second guide wall, and the third guide wall extends from the discharge port of the pressure regulator to the filter-side end of the guide section. extending in a straight line ,
The filter is arranged along the outer periphery of the pump cover,
The fuel supply device , wherein the guide portion guides fuel delivered from the pressure regulator into the fuel tank toward between the filter and the pump cover . The fuel supply device of claim 1 ,
further comprising a first fuel pipe disposed between the fuel pump and the internal combustion engine;
The fuel supply device, wherein the guide portion, the first fuel pipe, and the pressure regulator are integrated. The fuel supply device according to claim 2 ,
further comprising a second fuel pipe inserted into the end of the first fuel pipe opposite to the fuel pump;
the inner diameter of the end of the first fuel pipe opposite to the fuel pump is reduced from the end opposite to the fuel pump toward the fuel pump;
On the inner peripheral surface of the end portion of the first fuel pipe opposite to the fuel pump, a A fuel supply device in which an inclined ramp is arranged. The fuel supply device according to claim 3 ,
further comprising an O-ring attached to the second fuel tube and sandwiched between the first fuel tube and the second fuel tube;
The distance from the end of the first fuel pipe opposite to the fuel pump to the inclined surface is shorter than the distance from the end of the second fuel pipe on the first fuel pipe side to the O-ring. Device. The fuel supply device according to claim 3 or 4 ,
On the inner peripheral surface of the end portion of the first fuel pipe opposite to the fuel pump, a A plurality of inclined surfaces are arranged,
a first slanted surface of the plurality of slanted surfaces is disposed at the end of the first fuel pipe opposite to the fuel pump;
a second inclined surface of the plurality of inclined surfaces is spaced apart from the first inclined surface toward the fuel pump;
a third inclined surface among the plurality of inclined surfaces is spaced apart from the second inclined surface toward the fuel pump;
the inner diameter of the first fuel pipe on the second inclined surface is smaller than the inner diameter of the first fuel pipe on the first inclined surface;
The fuel supply device, wherein the inner diameter of the first fuel pipe at the third inclined surface is smaller than the inner diameter of the first fuel pipe at the second inclined surface.

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