Reserve structure of fuel supply device

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a reserve structure in a fuel supply device including an injector used in a vehicle such as a motorcycle.

【0002】

[Conventional technology]

As a conventional fuel supply device, a reserve chamber is provided in the fuel tank and connected to the vaporizer via a fuel cock, so that the residual fuel in the normal use part (hereinafter referred to as the main tank part) in the fuel tank is eliminated. It is known that when the fuel cock is opened to use the fuel in the reserve chamber.

【0003】

Further, a vehicle fuel supply device configured to supply fuel in a fuel tank to an injector by a fuel pump and recirculate overflow fuel into the fuel tank is also known (for example, Japanese Patent Application Laid-Open No. 5-124445). In such a fuel supply device, 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). , Special fair 5-10500).

【0004】

[Problems to be Solved by the Invention]

By the way, the fuel supply device provided with the injector has a complicated structure and a high cost because the residual fuel notification is an electric type. Therefore, it is desired that the fuel supply device provided with such an injector also adopts the structure provided with the reserve chamber as described above.

【0005】

In Japanese Patent Application Laid-Open No. 5-124445, it is indicated that an overflow chamber is provided as a sub tank in the fuel tank, and the overflow fuel is returned to this chamber. However, this structure narrows the bottom of the fuel tank and tilts the vehicle. The purpose is to reduce fluctuations in the fuel level due to fuel, and it cannot be used for reserve tanks. In addition, a part of the fuel in the overflow chamber remains without overflowing even when the vehicle body is tilted, so that the remaining amount of dead fuel that cannot be consumed increases. Therefore, the present invention aims to solve such a problem.

【0006】

[Means for solving problems]

In order to solve the above problems, the first invention relating to the reserve structure for a fuel supply device of the present application is a vehicle configured to supply fuel from a fuel tank to an injector by a fuel pump and recirculate overflow fuel into the fuel tank. In the fuel supply device, a reserve chamber is formed at a position higher than the fuel suction port of the fuel pump arranged in the fuel tank, overflow fuel is returned to this reserve chamber, and the bottom of the reserve chamber and the vicinity of the fuel pump suction rotor are separated. It is characterized in that a reserve passage for communication is provided and a fuel cock is provided in this reserve passage.

【0007】

The second invention is characterized in that, in the first invention, the reserve chamber is formed by a partition wall that partitions the inside of the fuel tank back and forth, and the partition wall connects the left and right side walls of the fuel tank. ..

【0008】

[Effect of the invention]

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 low, the fuel in the reserve chamber moves from the reserve chamber to the reserve passage. Through it, it is supplied to the vicinity of the fuel inlet of the fuel pump located at a lower level.

【0009】

Therefore, even in a fuel supply device equipped with an injector, a reserve chamber can be provided as in the conventional case, and the structure is simpler and more reliable and cheaper than in the case of an electric type using a sensor or a control unit. , Especially suitable for use in relatively small vehicles and the like.

【0010】

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

【0011】

According to the second invention, the partition wall increases the strength of the side wall of the fuel tank, and the grip performance is increased by 21 as compared with the one lacking such a partition wall, and the riding comfort is improved. In addition, the partition wall can suppress the oil level fluctuation of the fuel pump in the fuel tank with respect to the fuel suction rotor, and prevent the oil level fluctuation in the fuel tank and the entry of air bubbles into the fuel to maintain stable fuel supply performance at all times. It can be fueled.

【0012】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment configured for a small two-wheeled vehicle will be described based on the drawings. Fig. 1 to Fig. 4 are conceptual diagrams of the fuel tank part that constitutes this fuel supply device, Fig. 1 is the state where the inside is empty, Fig. 2 is the state during normal driving using the fuel of the main tank part, and Fig. 3 Is a diagram showing the state when the reserve chamber is switched, and FIG. 4 is a diagram showing the reserve fuel usage status in the reserve chamber. FIG. 5 is a schematic cross-sectional view taken along the line 5-5 of FIG. 1, and FIG. 6 is a configuration diagram embodying a part of the fuel supply device according to the present 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 part, 5 is a reserve chamber, and fuel in the fuel tank 1 is sent from the fuel pump 3 to the injector 6. From here, it is supplied to the combustion chamber of an engine (not shown), and the surplus is returned as overflow fuel to the reserve chamber 5 in the fuel tank 1 via the return pipe 7.

【0014】

The reserve chamber 5 is divided from the main tank portion 4 by a partition wall 8 on the inner front side of the fuel tank 1, and forms an open space upward to store overflow fuel and to store overflow fuel in 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 of the fuel tank 1 forms an upper portion 10 on the reserve chamber 5 side and a lower portion 11 on the main tank portion 4 side, and the fuel of the fuel pump 3 is close to the lower portion 11 located lower than the upper portion 10. The suction port 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 the bottom portions, and a fuel cock 13 is provided in the middle portion thereof so as to be openable and closable.

【0016】

As outlined in FIG. 5, the partition wall 8 is provided by connecting the left and right side walls 14, 14 of the fuel tank 1, and if necessary, the left and right ends 15, 15 are bent to form the left and right side walls 14, 14. An appropriate length is overlapped inward to form a reinforcing part. The connecting portions between the partition wall 8 and the left and right side walls 14, 14 are fixed by welding or the like, and are preferably located at or near the knee grip portion 16. The knee grip portion 16 is a portion sandwiched between the knees 17 in order for the occupant to stabilize the riding posture.

【0017】

In the specific example shown in FIG. 6, the bottom of the fuel tank 1 has a substantially stepped shape that decreases while changing in multiple 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 portion 10 forms an overhang portion 9 that bends forward and extends substantially parallel to the liquid level.

【0018】

Further, above the overhang portion 9, an upper cover 20 covering 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 is an overhang portion. An appropriate gap S is formed on the 9 and overlapped to form an overflow passage 21.

【0019】

The overflow passage 21 is for passing when the fuel in the reserve chamber 5 overflows from the upper end of the partition wall 8 to the main tank portion 4 side. Further, if the fuel tries to move to the main tank portion 4 side due to the fluctuation of the liquid level due to the inclination of the vehicle body or the like, it also becomes a kind of labyrinth structure that bends the movement path.

【0020】

One end of the return pipe 7 is connected to an appropriate position on the front wall 18 of the fuel tank 1 forming the front part of the reserve chamber 5 via a joint 22, and the lowest position of the upper portion 10 in the reserve chamber 5 One end of the reserve passage 12 is connected to the joint 23 provided in.

【0021】

The reserve passage 12 is arranged by utilizing the space formed by the bottom of the fuel tank 1 having a stepped shape, and the other end is a vertical wall portion that bends upward from the lowest lowermost 19 of the lower steps 11. It is connected to the joint 24 provided in 11a. The fuel cock 13 provided in the middle 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 has a downward slope toward the rear, and the pump assembly 26 is inserted into the main tank portion 4 through the opening 25 provided here. In the pump assembly 26, the fuel pump 3 and the high-pressure fuel filter 27 are integrated on the 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, which forms the fuel intake port portion of the fuel pump 3, faces the lowest position among the lowermost 19s and prepares for the backward movement of the fuel at the time of starting or the like. Further, 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 the 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 the fuel pump 3 is pumped. A part of the fuel is injected from the injector 6 to 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.

【0025】

Next, the operation of this embodiment will be described. FIG. 2 shows normal driving using the fuel of the main tank part 4, the fuel cock 13 is closed, the overflow fuel is returned to the reserve chamber 5 and stored there, and when it is full, the upper part of the partition wall 8 is used. It overflows from and is supplied to the main tank part 4.

【0026】

Therefore, the inside of 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. Therefore, regardless of the change in the posture of the vehicle body, it becomes easy to stably secure a predetermined amount of reserve fuel at all times.

【0027】

Figure 3 shows the state in which the fuel in the main tank section 4 has been exhausted, and the gas is temporarily out of gas. Therefore, it is possible to perceive this from changes in the state of the engine, etc., and immediately open the fuel cock 13. it can. Therefore, unlike the conventional electric notification system, there is no possibility that the indicator is overlooked, and the gas shortage state can be grasped more reliably.

【0028】

FIG. 4 shows the usage state of the reserve fuel, and the fuel in the reserve chamber 5 is supplied to the vicinity of the fuel intake port 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 resolved.

【0029】

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

【0030】

Moreover, even while the reserve fuel is in use, the overflow fuel continues to be supplied to the reserve chamber 5, which 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.

【0031】

Therefore, even in the fuel supply device equipped with the injector 6, a reserve chamber can be provided as in the conventional case, and the structure is simpler, more reliable, and cheaper than in the case of the electric type using a sensor or a control unit. Therefore, it is particularly suitable for use in a relatively 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 inside 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 its vicinity, the above effect becomes more reliable. However, the reinforcing portion forming a double wall shape is not always necessary, and it may be a simple connecting portion in which the left and right end surfaces of the partition wall 8 are abutted against the left and right side walls 14 and 14 and welded, and further, this connecting portion is kneeled. It may be positioned some distance from the grip portion 16.

【0034】

Further, since the partition wall 8 can suppress the oil level fluctuation of the fuel pump 3 in the fuel tank 1 with respect to the fuel suction rotor, it is always stable by preventing the oil level fluctuation in the fuel tank 1 and the mixing of air bubbles in the fuel. It is possible to maintain the improved fuel supply performance.

【0035】

Moreover, as shown in FIG. 6, since the overhang portion 9 is provided on the partition wall 8 and the upper cover 20 is provided above the partition wall 8 to form the overflow passage 21, the fuel is mainly used due to the fluctuation of the liquid level due to the inclination of the vehicle body and the like. If it tries to move to the tank portion 4 side, the movement path of the fuel is bent and a kind of labyrinth effect is generated, so that it becomes difficult to move. Therefore, it is possible to reduce the fluctuation of fuel due to the inclination of the vehicle body in the reserve chamber 5.

【0036】

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

【0037】

Further, the present invention is not limited to the above embodiment, and can be variously modified, and can be configured for various vehicles such as medium-sized or large-sized motorcycles or automobiles.

[Simple explanation of drawings]

[Figure 1]

Conceptual diagram of the fuel supply device according to the embodiment [Figure 2]

Similar figure showing the change of the usage mode [Fig. 3]

Same as above [Fig. 4]

Same as above [Fig. 5]

Schematic cross-sectional view along lines 5-5 in Figure 1. [Fig. 6]

Schematic configuration diagram that partially embodies 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