JPH0511698Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a saddle-shaped fuel tank for vehicles.

(Prior art) Fuel tanks for vehicles have a saddle formed by protruding the center part of the bottom in the vehicle width direction upwards, and are manufactured to allow propeller shafts, etc. to pass through the lower part of the saddle. When it is below the saddle, it separates into concave parts on both sides of the saddle, and if a single fuel pump is used like a fuel tank without a saddle, there is a drawback that it will run out of fuel even though there is still fuel left. For this reason, Utility Models 60-49021, 60-46436, 60-62323, and
There have been many proposals, such as those shown in various publications such as No. 60-141472, in which a fuel pump or suction tube of the pump is installed on one side of the saddle, and about 80% of the fuel pumped to the engine side by the fuel pump is Either place the turn tube that returns to the fuel tank on one side, or insert the suction tubes of the fuel pump on both sides, and lower the fuel level slightly before one side becomes unable to suck up the fuel. The suction tube on one side is configured to be automatically closed by a valve when the drop or deficiency is sensed by a floating member, etc.
Although some solutions have been taken, configurations using return tubes are unreliable because they rely on the amount of return fuel, and when using floating members, two are required, making the device No satisfactory solutions have been found, such as the high cost.

(Problems to be solved by the invention) In view of the above, a siphon that goes over the upper side of the saddle is provided on the other side and one side of the saddle, and the fuel on the other side is supplied with a fuel pump or a suction tube of the pump. The problem is solved by sending the fuel to the side by siphon action and causing the siphon action of the siphon to be caused by return fuel discharged from a return tube inserted on one side.

(Means for solving the problem) The purpose of the present invention is to solve the problem mentioned in the previous section by using a siphon. In the formed fuel tank body 1, a fuel pump or a suction tube 5 of the pump is provided on one side 3 of the saddle 2, and a return tube 7 is inserted, and the upper part of the saddle 2 is provided on the other side 4 and one side 3. 1st through
A siphon pipe 8 is provided, and an upper return fuel receiver 11 and a return fuel reservoir 12 having an upper wall 13 higher than the first siphon pipe 8 are installed in the lower part of the return tube 7. A guide pipe 14 is provided to guide a portion of the fuel excluding the overflow to the side to the return fuel reservoir 12, and a branch pipe 9 provided on one side 3 of the first siphon pipe 8 is inserted into the return fuel reservoir 12. This fuel tank is characterized in that a return fuel reservoir 12 is provided with a second siphon pipe 17 which is open on one side 3 and has a curve at a higher position than the first siphon pipe 8.

A preferred embodiment of the invention will now be described.

(Example) The attached Figures 1 and 2 show an example of the present invention.
Reference numeral 1 denotes a fuel tank body for mounting on a vehicle, which has a saddle 2 that projects upward from the center portion of the bottom surface in the vehicle width direction, and one side 3 and the other side 4 of the saddle 2 are recessed. The one side 3 is provided with a suction tube 5 to which a filter 6 of a fuel pump (not shown) provided outside the tank body 1 is attached, and a return tube 7.
Insert. The suction tube 5 may be replaced with an inner pump (fuel pump).

Reference numeral 8 denotes a first siphon tube passing over the saddle 2, which opens below the other side 4 and the one side 3, and has a branch tube 9 branched on the one side 3 side. Reference numeral 10 designates a shallow dish-shaped fuel receiver 11 on the lower side of the return tube 7 for receiving the return fuel spouted from the tube 7, and a high upper wall substantially below the receiver 11 that includes the branch pipe 9 of the first siphon pipe 8. An auxiliary tank with a return fuel reservoir 12 having 13 is fixed on the bottom of one side 3. Most of the fuel received in the return fuel receiver 11 overflows to one side 3, and a guide pipe 14 is provided to guide about 1/3 to the return fuel reservoir 12. Release it so that the fuel overflows to one side 3 and U
A trap portion 15 is provided which is shaped downward. The branch pipe 9 of the first siphon pipe 8 is inserted into and connected to the lower side surface of the return fuel reservoir 12, and a check valve 16 is attached to the inserted portion. Further, the return fuel reservoir 12 is provided with a second siphon pipe 17 curved downward at a position higher than the height including the branch pipe 9 of the first siphon pipe 8, and the second siphon pipe 17 has a lower end open on the return fuel reservoir 12 side. is set at approximately the same height as the communicating portion of the branch pipe 9, and the opening on one side 3 is set slightly higher. 1
8 is an air vent hole provided in the upper wall 13 of the return fuel reservoir 12, and 19 is a check valve for opening and closing the air vent hole.

(Function) In this embodiment, the engine is started in the state shown in Fig. 1, where the fuel is divided into one side 3 and the other side 4 due to fuel consumption, and the fuel pump starts feeding fuel to the engine. Since the return fuel in the return fuel reservoir 12 is empty and the first and second siphon pipes 8 and 17 are not producing siphon action in most cases, the fuel on one side 3 is sent to the engine. Although the liquid level is lowered, the return fuel is immediately poured from the return tube 7 into the fuel receiver 11 and most of it overflows to one side 3, and the remainder of the overflow is caused by the trap part 15 to release air bubbles upward and guide them. The return fuel enters the return fuel reservoir 12 via the pipe 14, and the return fuel gradually rises. The air in the return fuel reservoir 12 is released through the air vent hole 1 by opening the check valve 19 upward.
8 is discharged to one side 3. Furthermore, return reservoir 12
The check valve 16 is closed due to the fuel pressure inside, and fuel does not flow out. As shown in FIG. 2, when the fuel level of the return fuel reservoir 12 reaches the height of the bent part of the second siphon pipe 17, the fuel in the return fuel reservoir 12 flows from the second siphon pipe 17 to the one side 3 due to the siphon action. As shown in FIG. 3, the fuel level in the return fuel reservoir 12 drops, and the
As the pressure inside 2 decreases, the check valve 16 opens and removes the air from the branch pipe 9 and the first siphon pipe 8.
The siphon tube 8 is caused to have a siphon function. When the pressure in the return fuel reservoir 12 decreases, the check valve 19 closes to prevent air from flowing in from the one side 3. When the siphon function occurs in the first siphon pipe 8, the fuel on the other side 4 flows to the one side 3 through the siphon pipe 8, and the fuel on the one side 3 and the other side 4 always maintain approximately the same liquid level and keep the fuel in the tank constant. It can be used effectively till the end. Even if air gets mixed into the first siphon 8 during a sudden turn and the siphon function is lost, the return fuel will always be jetted out from the return tube 7, so the first operation in this explanation will be repeated. , the siphon function of the first siphon 8 is recovered in a short time.

The present invention does not require that the guide tube 14 be provided with the trap portion 15, and other functions are as described in the embodiments. Even if the communication part of the return fuel reservoir 12 is a through hole with a small diameter by using the branch pipe 9 instead of the check valve 16, the first siphon pipe 8 will have a siphon function, and the fuel will flow from the other side 4 to one side. Moving.

(Effects) The present invention relates to a saddle-shaped fuel tank for mounting on a vehicle, in which a fuel pump or suction tube 5 of the pump is provided on one side 3 of the saddle 2, a return tube 7 is inserted, and the other side 4 is provided with a fuel pump or a suction tube 5 of the pump. A first siphon pipe 8 is provided on one side 3 and passes over the saddle 2, and is held at the bottom of the return tube 7 by an upper return fuel receiver 11 and an upper wall 13 higher than the first siphon pipe 8 approximately below it. A return fuel reservoir 12 is installed, and a guide pipe 14 is provided to guide a part of the return fuel excluding the overflow to one side 3 of the fuel receiver 11 to the return fuel reservoir 12. The branch pipe 9 provided on the side 3 is connected to the return fuel reservoir 12.
In addition, a second siphon pipe 17 is provided in the return fuel reservoir 12 that is open on one side 3 and has a higher curve than the first siphon pipe 8. The fuel that does not move due to alternating current to the other side 4 is transferred from the other side 4 to the one side 3 by giving a siphon function to the first siphon pipe 8, and the fuel filled in the fuel tank is converted into a fuel tank without a saddle 2. It also has an effect that can be used up.

[Brief explanation of the drawing]

The attached drawings show one embodiment of the present invention.
1 and 2 are longitudinal sectional rear views showing one embodiment of the present invention, and FIG. 3 is a partial longitudinal sectional rear view. 1... fuel tank body, 2... saddle, 3... one side, 4... other side, 5... suction tube, 7
... Return tube, 8 ... First siphon tube, 9 ... Branch pipe, 11 ... Fuel receiver, 12 ...
Return fuel reservoir, 14...guiding pipe, 17...second siphon pipe.

Claims (1)

[Scope of utility model registration request] Saddle 2 with the center part of the bottom surface in the width direction protruding upward
In the fuel tank body 1, a fuel pump or a suction tube 5 of the pump is provided on one side 3 of the saddle 2, and a return tube 7 is inserted, and the other side 4 and one side 3 of the saddle 2 are provided with a fuel pump or a suction tube 5 of the pump. A first siphon pipe 8 passing above is provided, an upper return fuel receiver 11 is provided at the lower part of the return tube 7, and a return fuel reservoir 12 having an upper wall 13 higher than the first siphon pipe 8 is provided substantially below the return tube. A guide pipe 14 is installed to guide a part of the return fuel excluding the overflow to the first side 3 of the fuel receiver 11 to the return fuel reservoir 12, and a branch provided on the first siphon pipe 8 on the first side 3. Return pipe 9 to fuel reservoir 12
The fuel tank is further provided with a second siphon pipe 17 which is inserted into the return fuel reservoir 12 and is curved at a position higher than the first siphon pipe 8 and is open on one side 3.