JP3098166B2 - Fuel pump device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel pump device for sending fuel stored in a fuel tank to a carburetor or the like in an automobile, for example.

[0002]

2. Description of the Related Art FIG. 4 is a side sectional view showing a conventional fuel pump device described in, for example, Japanese Utility Model Publication No. 4-10377. In the figure, 1 is made by welding a steel plate into a box shape,
A fuel tank for storing fuel 15;
, 1b is a tank bottom. Reference numeral 2 denotes an electric fuel pump main body. The fuel pump main body 2 includes an intake port 2a, a discharge port 2b, and an impeller 2c driven by an electric motor (not shown) to perform a pumping operation. Reference numeral 3 denotes a rubber mount which is made of an elastic member such as rubber and is mounted on the fuel pump main body 2 and absorbs vibration generated by operation of the electric motor. Reference numeral 3a communicates with the suction port 2a when the rubber mount 3 is mounted on the fuel pump main body 2. The connection ports 4 formed on the rubber mount 3 are made of, for example, nylon mesh, and are net-shaped fuel filters attached to the connection ports 3a of the rubber mount 3. 5 is a bracket for fixing the fuel pump body 2 in the fuel tank 1, 6 is a band having one end welded to the bracket 5 and the other end fastened with a screw 7, and 8 is one end attached to the bracket 5. A pipe supporter whose other end supports the discharge port 2b, 9
Is a fuel hose connecting the discharge port 2b and the outlet pipe 10, and 11 is a plate for sealing the opening 1c of the fuel tank 1 via a packing 12.
1 is fixed to the other end of the bracket 5. Reference numeral 13 denotes a power supply line for supplying electric power to the fuel pump main body 2, and the power supply line 13 is drawn out of the fuel tank 1 via a terminal block 14.

In order to assemble the conventional fuel pump device configured as described above, first, the fuel pump main body 2 is mounted with the rubber mount 3 at its lower part, and then the lower end portion 5a of the L-shaped bracket 5 is bent. Put on. Then, the band 6 whose one end is welded to the bracket 5 is wound around the band tightening portion 3b of the rubber mount 3, and the screw 7 is tightened to fix the fuel pump main body 2 to the bracket 5. Next, the outlet 2b is supported by a pipe supporter 8 having one end attached to the bracket 5, and the outlet 2b and the outlet pipe 10 are connected by a fuel hose 9. further,
A mesh-shaped fuel filter 4 is connected to the connection port 3a of the rubber mount 3.
Attach. Then, the bracket 5 to which the fuel pump main body 2 is fixed is inserted into the tank through the opening 1c of the fuel tank 1, and the plate 12 is fixed to the tank upper surface 1a via the packing 12, so that the fuel pump device is assembled. . At this time, the net-shaped fuel filter 4 is
The length of the bracket 5 is set so as to be located in the vicinity.

[0004] In the conventional fuel pump device configured as described above, electric power is supplied through the power supply line 13 to operate the electric motor, and the impeller 2c rotates. Thus, the fuel 15 passes from the fuel tank 1 to the fuel pipe (not shown) through the net-shaped fuel filter 4, the connection port 3a of the rubber mount 3, the suction port 2a, the discharge port 2b, the fuel hose 9 and the outlet pipe 10. Through an engine (not shown). The vibration generated by the operation of the electric motor is absorbed by the rubber mount 3.

[0005]

As described above, in the conventional fuel pump device, when the fuel pump body 2 is assembled into the fuel tank 1, the rubber mount 3, the bracket 5, the band 6, the screw 7, the pipe support 8, Parts such as the fuel hose 9 are required, so that the number of parts is large and expensive,
There has been a problem that the assembling work becomes complicated. Further, since the fuel pump main body 2 is driven by an electric motor, the electric motor rotates at a high speed (about 4000 to 8000 revolutions /
There was also a problem that the noise increased. Further, since the net-shaped fuel filter 4 is used, it is necessary to dispose the fuel filter 4 near the tank bottom surface 1b.
For this reason, large and heavy foreign substances such as iron powder floating in the fuel 15 near the tank bottom surface 1b are to be filtered, and the fuel filter 4 tends to be clogged.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has as its first object to provide a fuel pump device which can simplify components and is inexpensive and can be easily assembled. . In addition, using a filter paper type fuel filter, it is difficult to inhale large and heavy foreign substances such as iron powder floating in the fuel near the bottom of the tank, thereby suppressing clogging of the fuel filter and increasing the efficiency of the fuel pump. It is a second object to obtain a fuel pump device that can be used.

[0007]

According to a first aspect of the present invention, there is provided a fuel pump apparatus comprising a cylinder, a plunger disposed reciprocally in the cylinder, and an electromagnetic coil for reciprocating the plunger. A fuel pump body attached to the upper surface of the fuel tank to close the opening of the fuel tank, and a suction pipe extending into the fuel tank through the opening from one side of the cylinder of the fuel pump body. A fuel filter mounted at the tip of the suction pipe, and a discharge pipe extending from the other side of the cylinder of the fuel pump body to the outside.

According to a second aspect of the present invention, there is provided a fuel pump device according to the first aspect, wherein the fuel filter comprises a filter paper type fuel filter, and a fuel suction pipe extends from the fuel filter to the fuel tank. It extends to the vicinity of the bottom surface.

[0009]

In the first aspect of the present invention, the plunger is reciprocated in the cylinder by exciting the electromagnetic coil, and the volume of one chamber of the cylinder defined by the plunger is reduced and expanded. Alternately, the volume of the other chamber alternates between expansion and contraction. Therefore, when the volume of one chamber communicating with the suction pipe increases, the pressure of the one chamber becomes negative, and the fuel in the fuel tank is sucked into the one chamber through the fuel filter and the suction pipe.
When the volume of one chamber is reduced, the fuel in one chamber is sent to the other chamber communicating with the discharge pipe. Further, when the volume of one chamber increases and the volume of the other chamber decreases, the fuel in the fuel tank is sucked into one chamber through a fuel filter and a suction pipe, and the fuel in the other chamber is discharged from the discharge pipe to the outside. Will be sent out. Therefore, the fuel in the fuel tank is sent out by repeating the reciprocating movement of the plunger in the cylinder.

[0010] In a second aspect of the present invention,
Since the fuel suction pipe extends from the fuel filter to the vicinity of the tank bottom of the fuel tank, large and heavy foreign substances such as iron powder floating in the fuel on the tank bottom were sucked up from the fuel suction pipe together with the fuel. At this time, it is difficult to reach the fuel filter due to its own weight. Therefore, the occurrence of clogging of the fuel filter is suppressed. Also, since the fuel filter is a filter paper type fuel filter, the dust filtering ability is increased,
Clean fuel is pumped out.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. Embodiment 1 FIG. FIG. 1 is a side sectional view showing a fuel pump device according to Embodiment 1 of the present invention. In the drawing, the same or corresponding parts as those of the conventional fuel pump device shown in FIG. Omitted. In the figure, reference numeral 21 denotes a fuel pump main body having a so-called self-priming type pump unit for generating a negative pressure due to a volume change to suck the fuel 15.
1a is a suction pipe arranged in the fuel pump body 21, 21b
Is a discharge pipe provided in the fuel pump main body 21, and 21c is a flange of the fuel pump main body 21. 22 is a suction tube 21
a, a plurality of mounting bolts welded to the tank upper surface 1a so as to surround the opening 1c; 24, a fastening nut; 25, a power supply for supplying power to the fuel pump body 21; It is an electric wire.

Here, the mounting bolt 2 is attached to the flange 21c.
At the position corresponding to No. 3, a mounting hole 21d is formed. The fuel pump body 21 is mounted on the tank upper surface 1a through the packing 12 so that the mounting bolt 23 is inserted through the mounting hole 21d, and the tightening nut 24 is tightened to the mounting bolt 23 projecting from the mounting hole 21d. Put on the fuel tank 1
The upper part is fixed with the opening 1c closed. At this time, the suction pipe 21a extends from the bottom of the fuel pump main body 21 through the opening 1c to the vicinity of the tank bottom 1b, and the fuel filter 22 is disposed near the tank bottom 1b.

Next, the configuration of the fuel pump main body 21 will be described with reference to FIG. A cylindrical cylinder 26 is installed with its axis in a vertical direction (vertical direction in the figure). A plunger 27 is slidably accommodated in the cylinder 26 in the vertical direction. Further, an electromagnetic coil 28 that acts to move the plunger 27 downward when energized is provided surrounding the cylinder 26. A spring 29 is contracted in the cylinder 26, and the urging force of the spring 29 acts to push the plunger 27 upward. A first valve 30 is provided between the cylinder 26 and the suction pipe 21a, and a second valve 3 is provided between the cylinder 26 and the discharge pipe 21b.
1 is provided. Further, a third valve 32 that partitions the inside of the cylinder 26 into a first chamber A and a second chamber B is provided in the plunger 27.

Next, the operation of the first embodiment will be described. Power is supplied from the power supply line 25 and the electromagnetic coil 28
Is supplied with an intermittent current. Then, the electromagnetic coil 28 alternately repeats a state of excitation and a state of non-excitation at a constant cycle. Therefore, in the excited state, the spring 2
The plunger 27 is pushed down against the urging force of No. 9 to reduce the volume of the first chamber A and expand and expand the volume of the second chamber B. In the non-excited state, the electromagnetic coil 2
8, the force of pushing down the plunger 27 is eliminated, and the plunger 27 is pushed upward by the urging force of the spring 29, whereby the volume of the first chamber A is expanded and expanded.
The volume of the second chamber B is reduced. And plunger 2
When 7 is pushed upward, the volume of the first chamber A is expanded and expanded, and the first chamber A becomes a negative pressure. Then, the first valve 30 is opened, the third valve 32 is closed, and the fuel 15 in the fuel tank 1 is removed from the fuel filter 22 through the suction pipe 21a.
Through the first chamber A. Then, when the plunger 27 is pushed down, the volume of the first chamber A decreases, the volume of the second chamber B expands and expands, the first chamber A becomes positive pressure, and the second chamber B becomes positive. It becomes negative pressure. Then, the first valve 30 and the second valve 31 are closed, the third valve 32 is opened, and the fuel 15 sucked into the first chamber A is supplied from the first chamber A to the second chamber. It is sent to B. Thereafter, when the plunger 27 is pushed upward, the volume of the first chamber A expands and expands, the volume of the second chamber B decreases, the first chamber A becomes a negative pressure, and the second chamber B becomes a negative pressure. It becomes positive pressure. Therefore, the first
The valve 30 and the second valve 31 are opened, and the third valve 32
Is closed, the fuel 15 fed into the second chamber B is discharged through the discharge pipe 21B, and the fuel 15 in the fuel tank 1 is discharged from the fuel filter 22 to the first chamber A via the suction pipe 21a. Sucked inside.

As described above, the fuel 15 passes through the fuel filter 22, the suction pipe 21a, the fuel pump main body 21, and the discharge pipe 21b by the vertical movement of the plunger 27 in the cylinder 26, that is, the reciprocating movement. It is supplied to an engine (not shown) via a pipe (not shown). At this time, since the fuel filter 22 is disposed near the tank bottom surface 1b, the fuel 15 can be reliably supplied to the engine even if the fuel 15 stored in the fuel tank 1 becomes small. Further, the fuel 15 is supplied to the engine after foreign matters are removed by the fuel filter 22.

As described above, according to the first embodiment, since the self-priming type fuel pump main body 21 is mounted on the upper surface of the fuel tank 1, the fuel pump main body 2 is connected to the fuel pump main body 2 as in a conventional fuel pump device. Mounting parts such as a rubber mount 3, a bracket 5, a band 6, a pipe supporter 8, and a fuel hose 9, which are necessary for mounting in the tank 1, become unnecessary.
The components are simplified, the cost is reduced accordingly, and the attachment and detachment of the fuel pump main body 21 is facilitated. In addition, the position where the power supply line 25 is taken out of the fuel tank 1 is outside the fuel tank 1, so that the terminal block 14 required in the conventional fuel pump device is not required, and the terminal block 14 does not need to be hermetically sealed, thereby improving reliability. There is an effect that can be.

Further, when the fuel pump main body 21 is operated, vibration corresponding to the cycle of the reciprocating movement of the plunger 27 is generated, and this vibration propagates to the tank upper surface 1a via the packing 12. Since the fuel tank 1 is made of a thin steel plate having low rigidity, when the upper surface 1a of the tank vibrates, the vibration energy is converted into sound, which causes a problem of noise. However, since the fuel pump body 21 can set the cycle of the reciprocating movement of the plunger 27 arbitrarily, the cycle of the reciprocating movement is set to 800 to 1 which is close to the idling speed of the engine.
By setting to 000 times / minute, it is possible to make it difficult to hear the pump sound and to eliminate the problem of noise.

Embodiment 2 FIG. FIG. 3 is a side sectional view showing a fuel pump device according to Embodiment 2 of the present invention.
Reference numeral 3 denotes a filter paper type fuel filter mounted on the tip of the suction pipe 21a and disposed at the middle position of the fuel tank 1. This fuel filter 33 is formed by folding the case 33a and the filter paper to form the fuel filter 33 inside the case 33a. , The cover 33c, and the like. Reference numeral 34 denotes a fuel suction pipe extending from the case 33a of the fuel filter 33 to the vicinity of the tank bottom surface 1b. Other configurations are the same as those in the first embodiment.

The filter paper type fuel filter 33 has a large filtering area and excellent dust filtering ability, but has a large volume. However, in the second embodiment, since the fuel pump main body 21 is mounted on the tank upper surface 1a of the fuel tank 1, the installation space for the fuel filter in the fuel tank 1 can be increased, and the filter paper type fuel filter 33 can be mounted. Is possible. As a result, the fuel 15
It is possible to remove foreign matter from the inside and supply it to the engine as clean fuel 15, thereby reducing the occurrence of malfunctions. Further, since the fuel filter 33 is disposed at the middle position of the fuel tank 1 and the tip of the fuel suction pipe 34 connected to the fuel filter 33 is located near the tank bottom surface 1b, the fuel filter 33 floats near the tank bottom surface 1b. Large and heavy foreign matter, such as iron powder, which is sucked in from the tip of the fuel suction pipe 34, does not easily reach the fuel filter 33 due to its own weight.
The occurrence of clogging of the fuel filter 33 is suppressed. As a result, the efficiency of the fuel pump can be improved.

[0020]

Since the present invention is configured as described above, it has the following effects.

According to the first aspect of the present invention, there is provided a cylinder, a plunger disposed reciprocally in the cylinder, and an electromagnetic coil for reciprocating the plunger. A fuel pump body attached to close the opening, a suction pipe extending from one side of the cylinder of the fuel pump body through the opening into the fuel tank, and attached to a tip of the suction pipe. Since it has a fuel filter and a discharge pipe extending from the other side of the cylinder of the fuel pump body to the outside, parts such as brackets that were conventionally required for mounting the fuel pump body in the fuel tank are unnecessary. Thus, it is possible to obtain a fuel pump device in which components are simplified, inexpensive, and easily assembled. Further, the cycle of the reciprocating movement of the plunger can be set in accordance with the cycle of the idling of the engine, so that the pump noise can be reduced.

According to a second aspect of the present invention, in the first aspect, the fuel filter is a filter-type fuel filter, and the fuel suction pipe extends from the fuel filter to the vicinity of the bottom of the fuel tank. Since it is extended, in addition to the effect of the first aspect of the invention, it is possible to improve the filtering ability, suppress the clogging of the fuel filter, and increase the efficiency of the fuel pump.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a fuel pump device according to Embodiment 1 of the present invention.

FIG. 2 is a side sectional view showing the periphery of a fuel pump main body of the fuel pump device according to Embodiment 1 of the present invention.

FIG. 3 is a side sectional view showing a fuel pump device according to Embodiment 2 of the present invention.

FIG. 4 is a side sectional view showing a conventional fuel pump device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Fuel tank, 1a tank top surface, 1b tank bottom surface, 1c opening, 21 fuel pump body, 21a suction pipe, 21b discharge pipe, 22 fuel filter, 26 cylinder, 27 plunger, 28 electromagnetic coil, 33, fuel filter, 34 fuel Inhalation tube.

Continued on the front page (56) References JP-A-64-67215 (JP, A) JP-A-58-70472 (JP, U) JP-A-57-174125 (JP, U) JP-A-3-35254 (JP) , U) Japanese Utility Model Showa 57-44995 (JP, U) Japanese Utility Model Showa 61-181860 (JP, U) Japanese Utility Model 4-10377 (JP, Y2) Japanese Utility Model 48-3540 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) F02M 37/08 F02M 37/22

Claims (2)

(57) [Claims] A cylinder, a plunger disposed reciprocally in the cylinder, and an electromagnetic coil for reciprocating the plunger, are mounted on an upper surface of the fuel tank so as to close an opening of the fuel tank. A fuel pump body, a suction pipe extending into the fuel tank through the opening from one side of the cylinder of the fuel pump body, and a fuel filter attached to a tip of the suction pipe, And a discharge pipe extending from the other side of the cylinder to the outside of the cylinder of the fuel pump body. 2. The fuel filter according to claim 1, wherein the fuel filter comprises a filter paper type fuel filter, and a fuel suction pipe extends from the fuel filter to a position near the bottom of the fuel tank. Fuel pump device.