JP2000282993A - Reserve structure of fuel supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a reserve chamber in a fuel supply device type having an injector. SOLUTION: The internal front part of a fuel tank 1 is partitioned by a partitioning wall 8 from a main tank part 4, and a reserve chamber 5 is formed to constitute a space left open upward. The bottom of the reserve chamber 5 constitutes an upper stage 10 higher than the bottom of the main tank part 4, and the suction port of a fuel pump 3 is located in proximity of the bottom of the main tank part 4 near the upper stage 10, and the main tank part 4 near the fuel suction port communicates with the bottom parts of reserve chamber 5 through a reserve passage 12, and in the middle a fuel cock 13 is provided openably. The fuel in the tank 1 is fed to an injector 6 from the pump 3, while the surplus portion is as overflow fuel returned to the reserve chamber 5 in the fuel tank 1 via a return pipe 7. The fuel, overflowing from the reserve chamber 5, flows out of the top of the partitioning wall 8 into the main tank part 4. When the fuel in the main tank part 4 is consumed, the fuel cock 13 is opened, and from the bottom of the reserve chamber 5 the reserve fuel is supplied near the fuel suction port.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reserve structure in a fuel supply device having an injector used for a vehicle such as a motorcycle.

[0002]

2. Description of the Related Art As a conventional fuel supply device, a reserve chamber is provided in a fuel tank and connected to a carburetor via a fuel cock, so that a normal use portion (hereinafter, referred to as a fuel tank) in the fuel tank is provided.
When the remaining fuel in the main tank is exhausted,
It is known that a fuel cock is opened to use fuel in a reserve chamber.

A fuel supply device for a vehicle is also known in which fuel in a fuel tank is supplied to an injector by a fuel pump and overflow fuel is recirculated into the fuel tank (for example, see Japanese Patent Application Laid-Open No. 5-1 / 5-1).
No. 24445). In such a fuel supply device, unlike the above-described conventional example, a reserve chamber is not provided, a sensor is provided in a fuel tank, and a warning is issued by an indicator lamp when the remaining fuel is low (for example, as an example). No. 5-10500).

[0004]

However, the fuel supply device provided with the above-mentioned injector has a complicated structure and an increased cost because the remaining fuel is notified electronically. Therefore, it is desired that the fuel supply device including such an injector also adopt the structure including the conventional reserve chamber.

Japanese Patent Application Laid-Open No. 5-124445 discloses that an overflow chamber is provided as a sub-tank in a fuel tank and overflow fuel is returned to the sub-tank. However, in this structure, the bottom of the fuel tank is narrowed. The purpose is to reduce the liquid level fluctuation of the fuel due to the inclination of the vehicle, and cannot be used for a reserve tank. Further, a part of the fuel in the overflow chamber remains without overflowing even when the vehicle body is tilted, so that the dead amount that cannot be consumed increases. Then, this invention aims at solving such a problem.

[0006]

According to a first aspect of the present invention, there is provided a fuel supply device reserve structure for supplying fuel from a fuel tank to a fuel pump by an injector and supplying overflow fuel to the fuel tank. In a fuel supply device for a vehicle configured to recirculate the fuel, a reserve chamber is formed at a position higher than a fuel suction port of a fuel pump disposed in a fuel tank, and overflow fuel is returned to the reserve chamber, and a bottom of the reserve chamber is formed. And a reserve passage communicating between the fuel passage and the vicinity of the fuel pump suction port, and a fuel cock is provided in the reserve passage.

According to a second aspect of the present invention, in the first aspect, the reserve chamber is formed by a partition wall for partitioning the inside of the fuel tank back and forth, and the partition wall connects the left and right side walls of the fuel tank. Features.

[0008]

According to the first aspect of the present invention, since the reserve chamber is filled with the returned overflow fuel, when the fuel cock is opened when the remaining fuel in the main tank portion becomes low, the fuel in the reserve chamber is reduced. The fuel is supplied from the chamber through the reserve passage to the vicinity of the fuel inlet of the lower fuel pump.

Therefore, even in a fuel supply device having an injector, a reserve chamber can be provided as in the prior art, and the structure is simple and highly reliable compared to an electric type using a sensor or a control unit. Moreover, it is inexpensive, and is particularly suitable for use in relatively small-sized vehicles and the like.

In addition, since the reserve chamber is always filled with overflow fuel, a predetermined amount of reserve fuel can be secured stably even when the vehicle body is tilted.

According to the second aspect of the present invention, the strength of the fuel tank side wall is increased by the partition wall, so that the grip performance is improved as compared with the case without such a partition wall, and the riding comfort is improved. In addition, the partition wall can suppress the oil level fluctuation with respect to the fuel suction port of the fuel pump in the fuel tank, prevent the oil level fluctuation in the fuel tank and the mixing of air bubbles in the fuel, and always provide a stable fuel supply performance. I can do it.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment configured for a wheeled vehicle will be described. FIGS. 1 to 4 are conceptual diagrams of a fuel tank portion constituting the fuel supply device. FIG. 1 shows an empty state, FIG. 2 shows a state during normal running using fuel in a main tank section, and FIG. FIG. 4 is a diagram illustrating a state when the reserve chamber is switched, and FIG. 4 is a diagram illustrating a reserve fuel use state of the reserve chamber. FIG. 5 is a schematic cross-sectional view along the line 5-5 in FIG. 1, and FIG. 6 is a configuration diagram that embodies a part of the fuel supply device according to the present embodiment.

In FIG. 1, reference numeral 1 denotes a fuel tank, 2 denotes a cap, 3 denotes a fuel pump, 4 denotes a main tank, 5 denotes a reserve chamber, and fuel in the fuel tank 1 is a fuel pump 3
Is supplied to the injector 6 from which the excess fuel is supplied to the combustion chamber of the engine (not shown), and the excess is returned to the reserve chamber 5 in the fuel tank 1 through the return pipe 7 as overflow fuel.

The reserve chamber 5 is formed by partitioning the inside front side of the fuel tank 1 from the main tank portion 4 by a partition wall 8 and forms a space which is open upward, stores overflow fuel and reserves fuel. The fuel exceeding the capacity of the chamber 5 overflows from the upper end of the partition wall 8 into the main tank section 4.

The bottom of the fuel tank 1 forms an upper section 10 on the side of the reserve chamber 5 and a lower section 11 on the side of the main tank 4.
The fuel inlet of the fuel pump 3 is located near the lower part 11 located lower than the upper part 10. In the vicinity of the fuel inlet, the main tank portion 4 and the reserve chamber 5 communicate with each other between the bottoms through a reserve passage 12, and a fuel cock 13 is provided at an intermediate portion thereof so as to be openable and closable.

As shown schematically in FIG. 5, the partition wall 8 is provided so as to connect the left and right side walls 14, 14 of the fuel tank 1, and if necessary, the left and right end portions 15, 15 are bent to form the left and right side walls 14. , 14 are overlapped by an appropriate length to form a reinforcing portion. Partition wall 8 and left and right side walls 14, 14
Is fixed by welding or the like, and is preferably located at or near the knee grip portion 16. The knee grip portion 16 is a portion that the occupant holds between the knees 17 to stabilize the riding posture.

In the specific example shown in FIG. 6, the bottom of the fuel tank 1 has a substantially stair-like shape which gradually lowers while changing in a plurality of steps toward the rear, and the upper step 10 mainly forms the bottom of the reserve chamber 5 on the front end side. The upper end of the partition wall 8 fixed to the upper step 10 forms an overhang 9 that bends forward and extends substantially parallel to the liquid surface.

Further, above the overhang portion 9,
An upper cover 20 that covers the upper opening of the reserve chamber 5 is provided so as to extend rearward from the front inner wall of the fuel tank 1, and the rear portion forms an appropriate gap S over the overhang portion 9. The overlap and the overflow passage 21 are formed.

The spill passage 21 is used to pass the fuel in the reserve chamber 5 when spilling from the upper end of the partition wall 8 to the main tank 4 side. Further, if the fuel moves to the main tank portion 4 side due to the liquid level fluctuation due to the inclination of the vehicle body or the like, it also has a kind of labyrinth structure in which the movement path is bent.

One end of the return pipe 7 is connected via a joint 22 to an appropriate position of the front wall 18 of the fuel tank 1 which forms the front of the reserve chamber 5. One end of the reserve passage 12 is connected to the joint 23 provided at the lowest position.

The reserve passage 12 is provided by utilizing a space formed by the bottom of the fuel tank 1 having a stepped shape, and the other end is provided at the lowest lowermost portion 19 of the lower portion 11.
It is connected to a joint 24 provided on the upright wall 11a that bends upward from the front end. The fuel cock 13 provided at an intermediate portion of the reserve passage 12 has a function of simply opening and closing the passage, and a known on-off valve structure can be appropriately used.

The lowermost portion 19 is inclined downward toward the rear, and an opening 25 provided in the lowermost portion 19 causes the pump assembly 2 to be inclined.
6 is inserted into the main tank portion 4. Pump assembly 2
Numeral 6 denotes a structure in which the fuel pump 3 and the high-pressure fuel filter 27 are integrated on a substrate 29 by a stay 28.
9 is detachably attached to the lowermost portion 19 so as to cover the opening 25.

The strainer 30, which is a fuel suction port of the fuel pump 3, faces the lowest position among the lowermost portions 19, and prepares for backward movement of fuel at the time of starting or the like. The outlet of the fuel pump 3 is connected to the high-pressure fuel filter 27 via a pipe 31, and the outlet side of the high-pressure fuel filter 27 is connected to a joint 33 provided at the lowermost part 19 by a hose 32.

The joint 33 is connected to one end of a high-pressure fuel pipe 34 outside the fuel tank 1, and the other end of the high-pressure fuel pipe 34 is connected to a joint 36 of a throttle body 35. Part of the pumped fuel is also injected from the injector 6 into the intake passage 37 of the engine, and the remaining fuel is returned to the return pipe 7 via the regulator 38 as overflow fuel.

Next, the operation of this embodiment will be described. FIG. 2 shows a normal running state using the fuel in the main tank section 4, in which the fuel cock 13 is closed, and the overflow fuel is returned to the reserve chamber 5 and stored therein. And is supplied to the main tank 4.

Therefore, the inside of the reserve chamber 5 is always filled with the overflow fuel, and even if the fuel in the reserve chamber 5 temporarily flows into the main tank portion 4 by inclining the vehicle body, it is filled again in a short time thereafter. For this reason, it becomes easy to always stably secure a predetermined amount of reserve fuel irrespective of a change in the vehicle body posture.

FIG. 3 shows a state in which the fuel in the main tank portion 4 has been exhausted, and the fuel tank 13 is temporarily run out of gas. Can be opened. Therefore, unlike the conventional electric notification system, there is no possibility that the indicator is overlooked or the like, and the gas-out state can be grasped more reliably.

FIG. 4 shows the state of use of the reserve fuel.
The fuel in the reserve chamber 5 is supplied to the vicinity of the fuel inlet of the fuel pump 3 in the main tank part 4 through the reserve passage 12 by opening the chamber fuel cock 13, and the gas shortage state is eliminated.

At this time, since the reserve passage 12 forms the bottom of the reserve chamber 5 and protrudes from the upper portion 10 located above the fuel inlet, all the fuel in the reserve chamber 5 can be consumed. The dead amount can be greatly reduced as compared with the case where fuel flows out only from the upper opening.

In addition, even when the reserve fuel is used, the overflow fuel is continuously supplied to the reserve chamber 5 and can be supplied to the fuel pump 3, so that all the fuel can be consumed almost completely, and the fuel use can be made more efficient.

Therefore, even in the fuel supply device provided with the injector 6, a reserve chamber can be provided as in the prior art, and the structure is simpler and more reliable than in the case of an electric type using a sensor or a control unit. It is expensive and inexpensive, and is particularly suitable for use in relatively small-sized small vehicles.

The left and right ends 15, 15 of the partition wall 8 are also provided.
Are overlapped by an appropriate length on the inner side of the left and right side walls 14, 14 to form a reinforcing portion, so that the strength of the side walls 14, 14 of the fuel tank 1 is increased, and compared to the conventional one without such a partition wall 8. One grip performance is increased and riding feeling is improved.

In this case, if the position of the reinforcing portion is set to the knee grip portion 16 or the vicinity thereof, the above-mentioned effect becomes more reliable. However, the reinforcing portion having a double wall shape is not always necessary, and the left and right end surfaces of the partition wall 8 are joined to the left and right side walls 14,
It may be a simple connecting part that was welded against the
Further, the connecting portion may be located at a certain distance from the knee grip portion 16.

Further, the partition wall 8 can suppress the fluctuation of the oil level of the fuel pump 3 in the fuel tank 1 with respect to the fuel suction port, thereby preventing the fluctuation of the oil level in the fuel tank 1 and the mixing of air bubbles into the fuel. And constantly maintain stable fuel supply performance.

Further, as shown in FIG. 6, an overhang portion 9 is provided on the partition wall 8 and the upper cover 2 is provided above the overhang portion 9.
Since the overflow passage 21 is formed by providing 0, if the fuel attempts to move toward the main tank portion 4 due to the liquid level fluctuation due to the inclination of the vehicle body or the like, the fuel movement path is bent and a kind of labyrinth effect occurs. Therefore, it becomes difficult to move. Therefore, it is possible to further reduce the fuel fluctuation due to the inclination of the vehicle body and the like in the reserve chamber 5.

Since the overhang portion 9 and the upper cover 20 alone have the effect of suppressing the fluctuation of the liquid level to the extent of an ant, only one of the overhang portion 9 and the upper cover 20 may be provided. However, the overhang portion 9 and the upper cover 20 are not essential in the present invention, and both may be omitted.

Further, the present invention is not limited to the above-described embodiment, but can be variously modified. For example, the present invention can be configured for various vehicles such as a medium-sized or large-sized motorcycle or an automobile.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a fuel supply device according to an embodiment.

FIG. 2 is a similar view showing a change in the mode of use.

FIG. 3

FIG. 4

FIG. 5 is a schematic sectional view taken along the line 5-5 in FIG. 1;

FIG. 6 is a schematic configuration diagram partially embodying the fuel supply device according to the embodiment;

[Explanation of symbols]

1: fuel tank, 3: fuel pump, 4: main tank,
5: Reserve chamber, 6: Injector, 7: Return pipe,
8: Partition wall, 12: Reserve passage, 13: Fuel cock

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[Procedure amendment]

[Submission date] April 1, 1999 (1999.4.1)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name]

[Correction method] Change

[Correction contents]

FIG. 5

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02M 37/04 B60K 15/02 J 37/10 C

Claims (2)

[Claims] A fuel supply device for a vehicle configured to supply fuel from a fuel tank to an injector by a fuel pump and to recirculate overflow fuel into the fuel tank. A reserve chamber is formed at a position higher than the mouth, the overflow fuel is returned to the reserve chamber, a reserve passage communicating the bottom of the reserve chamber and the vicinity of the fuel pump suction port is provided, and a fuel cock is provided in the reserve passage. A reserve structure of a fuel supply device characterized by the above-mentioned. 2. The fuel tank according to claim 1, wherein the reserve chamber is formed by a partition wall for partitioning the inside of the fuel tank back and forth, and the partition wall connects the left and right side walls of the fuel tank. Reserve structure of fuel supply device.