JP4130033B2 - Fuel supply reserve structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reserve structure in a fuel supply apparatus including an injector used in a vehicle such as a motorcycle.
[0002]
[Prior art]
As a conventional fuel supply device, a reserve chamber is provided in the fuel tank and connected to the carburetor via the fuel cock, so that there is no remaining fuel in the normal use part (hereinafter referred to as the main tank part) in the fuel tank. When the fuel cock is opened, the fuel in the reserve chamber is used.
[0003]
Further, 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 is also known (for example, Japanese Patent Laid-Open No. 5-124445). In such a fuel supply apparatus, unlike the conventional example described above, a reserve chamber is not provided, a sensor is provided in the fuel tank, and an indicator lamp warns when the remaining fuel is low (as an example) No. 5-10500).
[0004]
[Problems to be solved by the invention]
By the way, since the fuel supply apparatus provided with the said injector uses the remaining fuel notification as an electric type, the structure is complicated and the cost is increased. Therefore, it is desirable to adopt a structure including the conventional reserve chamber in the fuel supply apparatus including such an injector.
[0005]
In JP-A-5-124445, it is shown that an overflow chamber is provided as a sub-tank in the fuel tank and the overflow fuel is returned to this. However, this structure narrows the bottom of the fuel tank and tilts the vehicle. This is intended to reduce the fuel level fluctuation due to the above, and cannot be used for a reserve tank. In addition, a part of the fuel in the overflow chamber remains without overflowing when the vehicle body is tilted, resulting in an increase in the remaining amount of death that cannot be consumed. Accordingly, the present invention aims to solve such problems.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, a first invention relating to a reserve structure for a fuel supply device of the present application is directed to 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. In the fuel supply apparatus, the fuel tank includes a reserve chamber and a main tank section that are partitioned by a partition wall, and the reserve chamber is connected to the main tank section at an upper portion thereof, and fuel of a fuel pump disposed in the main tank section . features are formed higher than the suction port position, to the reserve chamber with returning overflow fuel, the reserve passage connecting the storage chamber bottom and the fuel pump intake b near portion is provided, in that a fuel cock to the reserve path And
[0007]
According to a second aspect of the present invention, in the first aspect, the reserve chamber is formed by a partition wall that partitions the fuel tank forward and backward, and the partition wall connects the left and right side walls of the fuel tank. .
[0008]
【The invention's effect】
According to the first 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 is reduced, the fuel in the reserve chamber passes through the reserve passage from the reserve chamber. It is supplied to the vicinity of the fuel inlet of the fuel pump located at a lower position.
[0009]
Therefore, even in a fuel supply apparatus equipped with an injector, a reserve chamber can be provided as in the prior art, and the structure is simple, reliable and inexpensive compared to an electric type using a sensor and a control unit. Particularly, it is suitable for use in a relatively small-sized small vehicle or the like.
[0010]
In addition, since the reserve chamber is always filled with the overflow fuel, a predetermined amount of reserve fuel can be secured stably even when the vehicle body is inclined.
[0011]
According to the second aspect of the present invention, the partition wall increases the strength of the fuel tank side wall, and the grip performance is increased as compared with a case where such a partition wall is not provided, thereby improving the riding comfort. In addition, the partition wall can suppress oil level fluctuations with respect to the fuel suction of the fuel pump in the fuel tank, preventing oil level fluctuations in the fuel tank and mixing of bubbles into the fuel, ensuring stable fuel supply performance. I can maintain it.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment configured for a small motorcycle will be described below with reference to the drawings. 1 to 4 are conceptual diagrams of a fuel tank portion constituting this fuel supply device, FIG. 1 is an empty state inside, FIG. 2 is a state during normal running using fuel in the main tank portion, FIG. Is a state when the reserve chamber is switched, and FIG. 4 is a diagram showing a reserved fuel usage state of the reserve chamber. FIG. 5 is a schematic cross-sectional view taken along line 5-5 of FIG. 1, and FIG. 6 is a configuration diagram embodying a part of the fuel supply apparatus according to this embodiment.
[0013]
In FIG. 1, reference numeral 1 is a fuel tank, 2 is a cap, 3 is a fuel pump, 4 is a main tank section, and 5 is a reserve chamber. Fuel in the fuel tank 1 is sent from the fuel pump 3 to an injector 6; From here, it is supplied to a combustion chamber of an engine (not shown), and surplus is returned to the reserve chamber 5 in the fuel tank 1 through the return pipe 7 as overflow fuel.
[0014]
The reserve chamber 5 is formed by partitioning the inner front side of the fuel tank 1 from the main tank portion 4 by a partition wall 8. The reserve chamber 5 has a space opened upward, stores overflow fuel, and stores the reserve chamber 5. The fuel exceeding the capacity overflows from the upper end portion of the partition wall 8 into the main tank portion 4.
[0015]
The bottom portion of the fuel tank 1 forms an upper step portion 10 on the reserve chamber 5 side and a lower step portion 11 on the main tank portion 4 side, and close to the lower step portion 11 positioned lower than the upper step portion 10, the fuel of the fuel pump 3. The inlet is located. Further, in the vicinity of the fuel intake port, the main tank portion 4 and the reserve chamber 5 are communicated with each other by a reserve passage 12 between them, and a fuel cock 13 is provided at an intermediate portion thereof so as to be freely opened and closed.
[0016]
As schematically shown in FIG. 5, the partition wall 8 is provided by connecting the left and right side walls 14, 14 in the fuel tank 1, and if necessary, the left and right side end portions 15, 15 are bent to form the left and right side walls 14, 14. Appropriate lengths are superimposed on the inside to form a reinforcement. The connecting portion between the partition wall 8 and the left and right side walls 14 and 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 pinches with the knee 17 in order to stabilize the riding posture.
[0017]
In the specific example shown in FIG. 6, the bottom of the fuel tank 1 has a substantially staircase shape that is lowered while changing backward in a plurality of steps, and the upper step 10 mainly forms the bottom of the reserve chamber 5 on the front end side. The upper end portion of the partition wall 8 fixed to the upper step portion 10 forms an overhang portion 9 that bends forward and extends substantially parallel to the liquid surface.
[0018]
Further, an upper cover 20 that covers the upper opening of the reserve chamber 5 is provided above the overhang portion 9 so as to extend rearward from the front inner wall of the fuel tank 1, and its rear portion is an overhang portion. An overflow passage 21 is formed by overlapping with an appropriate gap S.
[0019]
The overflow passage 21 is for the fuel in the reserve chamber 5 to pass when it overflows from the upper end of the partition wall 8 to the main tank portion 4 side. Further, if the fuel moves toward the main tank portion 4 due to the fluctuation of the liquid level caused by the inclination of the vehicle body, it becomes a kind of labyrinth structure that bends the moving path.
[0020]
One end of the return pipe 7 is connected to the appropriate position of the front wall 18 of the fuel tank 1 that forms the front of the reserve chamber 5 via a joint 22, and the lowest position of the upper stage portion 10 in the reserve chamber 5. One end of the reserve passage 12 is connected to the joint 23 provided in the front end.
[0021]
The reserve passage 12 is disposed using a space formed by the bottom of the fuel tank 1 having a stepped shape, and the other end is a standing wall portion that bends upward from the front end portion of the lowermost step 19 of the lower step portion 11. It is connected to a joint 24 provided in 11a. The fuel cock 13 provided in the 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.
[0022]
The lowermost portion 19 is inclined downward toward the rear, and a pump assembly 26 is inserted into the main tank portion 4 through an opening 25 provided therein. The pump assembly 26 is obtained by integrating the fuel pump 3 and the high-pressure fuel filter 27 onto a substrate 29 by a stay 28, and the substrate 29 is detachably attached to the lowermost portion 19 so as to cover the opening 25.
[0023]
The strainer 30 that forms the fuel inlet portion of the fuel pump 3 faces the lowest position in the lowermost portion 19 and is provided for the rearward movement of the fuel when starting. The discharge port of the fuel pump 3 is connected to the high-pressure fuel filter 27 by a pipe 31, and the outlet side of the high-pressure fuel filter 27 is connected to a joint 33 provided at the lowermost portion 19 by a hose 32.
[0024]
The joint 33 is connected to one end of the high-pressure fuel pipe 34 outside the fuel tank 1, and the other end of the high-pressure fuel pipe 34 is connected to the joint portion 36 of the throttle body 35, where it is pumped from the fuel pump 3 side. Part of the fuel is also injected into the intake passage 37 from the injector 6 and the remaining fuel is returned to the return pipe 7 via the regulator 38 as overflow fuel.
[0025]
Next, the operation of this embodiment will be described. FIG. 2 shows a normal driving time using the fuel in the main tank portion 4, the fuel cock 13 is closed, and the overflow fuel is returned to the reserve chamber 5 and stored therein, and when full, the upper portion of the partition wall 8 And is supplied to the main tank unit 4.
[0026]
Therefore, the reserve chamber 5 is always filled with overflow fuel, and even if the fuel in the reserve chamber 5 temporarily flows out to the main tank portion 4 by tilting the vehicle body, it is filled again in a short time thereafter. For this reason, it becomes easy to always secure a predetermined amount of reserve fuel regardless of changes in the vehicle body posture.
[0027]
FIG. 3 shows a state in which the fuel in the main tank unit 4 has been exhausted, and the gas tank is temporarily out of gas. Therefore, the fuel cock 13 can be opened immediately by recognizing this from the state change of the engine. it can. Therefore, unlike the conventional electric notification system, there is no possibility that the indicator is overlooked, and the out-of-gas condition can be grasped more reliably.
[0028]
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 portion 4 through the reserve passage 12 by opening the chamber fuel cock 13. And the out-of-gas condition is eliminated.
[0029]
At this time, the reserve passage 12 forms the bottom of the reserve chamber 5 and exits from the upper stage portion 10 located above the fuel intake port, so that all the fuel in the reserve chamber 5 can be consumed and the upper opening The remaining amount of death can be greatly reduced as compared with the fuel flowing out from only the part.
[0030]
Moreover, even when the reserve fuel is used, the overflow fuel continues to be 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 use of the fuel can be made more efficient.
[0031]
Therefore, even in the fuel supply device provided with the injector 6, a reserve chamber can be provided as in the conventional case, and the structure is single, reliable and inexpensive compared to the electric type using the sensor and the control unit. In particular, it is suitable for use in a relatively small-sized small vehicle or the like.
[0032]
Further, since the left and right end portions 15 and 15 of the partition wall 8 are overlapped with appropriate lengths on the inner sides of the left and right side walls 14 and 14 to form a reinforcing portion, the strength of the side walls 14 and 14 of the fuel tank 1 is increased. Compared to the conventional one without the partition wall 8, the grip performance is increased and the riding comfort is improved.
[0033]
In this case, if the position of the reinforcing portion is set to the knee grip portion 16 or the vicinity thereof, the above-described effect becomes more reliable. However, the double wall-shaped reinforcing portion is not necessarily required, and it may be a simple connecting portion in which the left and right end faces of the partition wall 8 are butted against the left and right side walls 14, 14. It may be located some distance away from the grip portion 16.
[0034]
In addition, since the partition wall 8 can suppress oil level fluctuations in the fuel tank 1 relative to the fuel suction of the fuel pump 3, the oil level fluctuations in the fuel tank 1 and air bubbles in the fuel are prevented from being constantly stabilized. The fuel supply performance can be maintained.
[0035]
In addition, as shown in FIG. 6, since the overhang portion 9 is provided in the partition wall 8 and the upper cover 20 is provided above the partition wall 8, the overflow passage 21 is formed. If it is going to move to the tank part 4 side, the movement path of the fuel is bent and a kind of labyrinth effect is produced, so that it becomes difficult to move. Therefore, the fluctuation of the fuel accompanying the inclination of the vehicle body in the reserve chamber 5 can be reduced.
[0036]
In addition, since the overhang part 9 and the upper cover 20 are each effective in suppressing the liquid level fluctuation to the extent of an ant, only the overhang part 9 or 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 of them can be omitted.
[0037]
Furthermore, the present invention is not limited to the above-described embodiments, and can be variously modified.
It can be configured for various types of vehicles such as medium-sized or large-sized motorcycles or automobiles.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of a fuel supply apparatus according to an embodiment. FIG. 2 is a similar diagram showing a change in usage. FIG. 3 is a diagram showing the same. FIG. 4 is a diagram showing the same. Fig. 6 is a schematic sectional view partially embodying the fuel supply apparatus according to the embodiment.
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

Claims (2)

In 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, the fuel tank has a reserve chamber and a main tank section partitioned by a partition wall The reserve chamber is formed at a position where the upper portion communicates with the main tank portion and is higher than the fuel suction port of the fuel pump disposed in the main tank portion, and returns the overflow fuel to the reserve chamber, and the bottom portion of the reserve chamber A reserve structure for a fuel supply device, wherein a reserve passage that communicates with a fuel pump suction portion is provided, and a fuel cock is provided in the reserve passage. The reserve of the fuel supply device according to claim 1, wherein the reserve chamber is formed by a partition wall that divides the inside of the fuel tank forward and backward, and the partition wall connects between the left and right side walls of the fuel tank. Construction.

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