JPH08200178A - Fuel pulsation damper in fuel feeding device for internal combustion engine - Google Patents

Abstract

PURPOSE: To provide a fuel separation damper which is constituted to improve a damping effect of pulsation of fuel generated by a fuel pump and a fuel injection valve. CONSTITUTION: A casing is partitioned into first and second chambers 4 and 5 by a partition body 3. A fuel flow passage C connected to a fuel pump and a fuel distribution passage B1 of a fuel distribution piping B are opened to the first chamber 4. Pressurized gas is added on the second chamber 5 and the pressure of the gas is made equal to the pressure of fuel exerted on the interior of the first chamber 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine in which fuel in a fuel tank is pressurized by a fuel pump and supplied to a fuel distribution pipe, and the fuel in the fuel distribution pipe is injected into an intake pipe through a fuel injection valve. And more particularly to a fuel pulsation damper for attenuating fuel pulsation that occurs in the fuel flow path from the fuel pump to the fuel distribution pipe or in the fuel distribution passage of the fuel distribution pipe.

[0002]

2. Description of the Related Art In the fuel flow path from a fuel pump to a fuel distribution pipe, fuel pulsation occurs mainly due to periodical changes in the discharge pressure of the fuel pump, while in the fuel distribution path, The pulsation of fuel is caused mainly by the reflected wave generated when the fuel injection valve is closed. When such fuel pulsation occurs, the amount of fuel injected from the fuel injection valve varies, and accurate fuel cannot be supplied to the engine. Alternatively, it causes a problem that the fuel piping system forming the fuel flow path vibrates to generate noise. The fuel pulsation damper is prepared to solve the above problems. A conventional pulsation damper is disclosed in Japanese Utility Model Laid-Open No. 55-20620. This pulsation damper is divided into a main pipe inner space and an air chamber by a diaphragm, and the pulsation of fuel generated in the main pipe can be absorbed or reduced by the diaphragm contracting and expanding the air in the air chamber. Is.

[0003]

According to such a conventional pulsation damper, although the pulsation is absorbed, it is difficult to greatly attenuate the pulsation. This is what will be clarified in the description of the operation of the present invention, the point is that the air chamber is in a closed state,
This is because even if the diaphragm moves, the gas pressure in the air chamber cannot be increased to a pressure state approximately equal to the liquid pressure applied to the liquid chamber.

The present invention has been made in view of the above problems, and a main object of the present invention is to provide a pulsation damper capable of greatly damping fuel pulsation.

[0005]

According to the pulsation damper in the fuel supply system for the internal combustion engine of the present invention, the fuel distribution passage is bored inside, and the fuel is controlled from the fuel distribution passage toward the intake pipe. A fuel distribution pipe equipped with a fuel injection valve for injecting fuel, a fuel pump for supplying fuel in a fuel tank to the fuel distribution pipe, a fuel pump, and a fuel flow passage including a fuel distribution passage of the fuel distribution pipe. In the fuel supply device for an internal combustion engine including the fuel pulsation damper, the fuel pulsation damper is divided into a first chamber and a second chamber by a flat partition body, and the fuel pulsation damper is provided in the first chamber. Is a fuel flow path connected to the fuel pump and a fuel distribution path of the fuel distribution pipe is opened to introduce fuel, while the second chamber has a gas pressure of the same pressure as the fuel pressure introduced into the first chamber. Have That the introduction of pressurized gas first
It is a feature of.

Further, according to the present invention, at one end of the fuel distribution pipe,
A first recess is provided that opens with a flange toward one side, and a cover having a second recess is disposed on the flange with a partition body interposed between the first recess and the first recess on the other side of the partition body. A chamber is formed, and a second chamber is formed on the second recess and one side of the partition body. In the first chamber, a fuel passage communicating with the fuel pump and a fuel distribution passage of the fuel distribution pipe are opened, and the fuel is formed. On the other hand, the second feature is that a pressurized gas having a gas pressure of the same pressure as the fuel pressure introduced into the first chamber is introduced into the second chamber.

A third feature of the present invention is that the flat plate-shaped partition body is formed of fluororubber containing a base cloth.

According to a fourth aspect of the present invention, the flat plate-shaped partition body is formed of polyphenylene sulfide.
It is a feature of.

A fifth feature of the present invention is that the flat plate-shaped partition body is formed of a thin metal plate.

Further, according to the present invention, a fuel distribution pipe is provided inside, and a fuel distribution pipe having a fuel injection valve for controlling and injecting fuel from the fuel distribution passage toward an intake pipe, and a fuel tank. Fuel pump for supplying the fuel of the above to the fuel distribution pipe,
In a fuel supply device for an internal combustion engine, comprising a fuel pump and a fuel pulsation damper arranged in a fuel flow path including a fuel distribution passage of a fuel distribution pipe, the fuel pulsation damper is a flat plate-shaped partition body. It is formed by being divided into a first chamber and a second chamber, and the first chamber is formed by introducing fuel by opening a fuel flow passage that communicates with a fuel pump and a fuel distribution passage of a fuel distribution pipe. The device is formed by providing a piston operation flow path in the air cylinder on one side of the pressure piston slidably arranged in the air cylinder and a pressure flow path in the air cylinder on the other side of the pressure piston. Then, the piston operation flow path of the gas pressurizing device is connected and opened to the fuel flow path, and the pressurizing flow path is connected and opened to the second chamber, and the pressure of the gas applied to the second chamber via the pressurizing flow path is adjusted to the first level. 1 That was equal to the pressure of the fuel exerted to the inner characterized sixth.

[0011]

According to the first feature of the present invention, the fuel pulsation can be greatly reduced by causing the pressurized gas having the same pressure as the liquid pressure applied in the first chamber to act in the second chamber. It is a thing.

Further, according to the second aspect of the present invention, it is possible to provide an extremely compact fuel pulsation damper which can greatly reduce the fuel pulsation generated in the fuel distribution passage.

Further, according to the third feature of the present invention, since the partition body has excellent chemical resistance, weather resistance and heat resistance, it can be arranged in the vicinity of the internal combustion engine as a heat generating section, and Gasoline, alcohol, petroleum, oil mixed gasoline,
It can withstand the use of various fuels such as gasohol.

According to the fourth feature of the present invention, in addition to the third feature, the partition can be formed by injection molding, so that the partition can be manufactured at extremely low cost and easily. It is a thing.

Further, according to the fifth feature of the present invention, the rigidity of the partition body can be increased, so that the partition body is suitable as a partition body to be mounted on an internal combustion engine having particularly severe vibration conditions.

According to the sixth aspect of the present invention, the gas pressure having the same pressure as the fuel pressure can be generated in the gas pressurizing device by utilizing the pressure of the fuel flowing in the fuel passage. . Then, by introducing the pressurized gas generated in the gas pressurizing device into the second chamber, it is possible to introduce into the second chamber a gas pressure having the same pressure as the liquid pressure supplied to the first chamber. . Further, the pressure of the fuel flowing in the fuel flow passage has different values in various operating states, for example, at the time of idling, when fully opened, etc., but this gas pressurizing device always generates a gas pressure corresponding to the fuel pressure. can do. Therefore, the fuel pulsation damping effect can be improved over the entire operating region. Further, even if the partition body is damaged and the fuel flows into the second chamber, for example, the gas pressurizing device has a pressurizing passage connected to the second chamber and opened by a pressurizing piston arranged in the air cylinder. Since a blind hole, that is, a closed circuit is formed, no fuel leaks to the outside. Even if the fuel flows into the piston operation flow path side through the pressurizing piston, the piston operation flow path forms a connection opening, that is, a closed circuit in the fuel flow path, so that the fuel does not leak to the outside.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a fuel pulsation damper in a fuel supply system for an internal combustion engine according to the present invention will be described below. First, the entire intake system passage of the fuel supply system including the internal combustion engine E will be described with reference to FIG. 1. In the intake passage 21 connected to the intake valve 20 of the internal combustion engine E (hereinafter referred to as the engine),
The intake pipe 22 is connected, and further upstream thereof, a throttle body 24 having a throttle valve 23 and an air cleaner 25 are provided.
Is connected. 26 is a fuel tank in which fuel is stored. The fuel in the fuel tank 26 is the fuel pump 27.
The pressurized fuel is pressurized by the fuel strainer 28 and the fuel pulsation damper A.
Is supplied into the fuel distribution passage B1 of the fuel distribution pipe B via
The fuel in the fuel distribution path B1 is injected and supplied into the intake pipe 22 via the fuel injection valve J. The above-described fuel pump 27 and the fuel distribution pipe B are connected by the fuel flow path C. still,
Reference numeral 29 is a pressure regulator for controlling the fuel pressure in the fuel passage C or the fuel distribution passage B1 to a constant pressure.

The fuel pulsation damper A is constructed as shown in FIG. D is a bottomed cup-shaped first housing 1 having an opening on the left side and a bottomed cup-shaped second housing having an opening on the right side.
It is a casing including the casing 2, and a flat plate-shaped partitioning body 3 is arranged in the openings of both the casings 1 and 2. The other side 3A of the partition 3 and the first housing 1 form a first chamber 4, and the one side 3B of the partition 3 and the second housing 2 form a second chamber 5. The fuel flow path C and the fuel outflow path 6 are opened in the first chamber 4, and the fuel in the fuel tank 26 pressurized by the fuel pump 27 is the fuel flow path C.
The fuel in the first chamber 4 is supplied from the fuel outflow passage 6 into the fuel distribution passage B1 of the fuel distribution pipe B through the fuel outflow passage 6, and the fuel in the fuel distribution passage B1 is The fuel is injected from the fuel injection valve J into the intake pipe 22.

When the fuel pump 27 is operated, the discharge pressure of the fuel discharged from the fuel pump 27 changes periodically to cause pulsation, and this pulsation passes through the fuel flow path C to the first position. Acts in the one chamber 4. On the other hand, when the fuel injection valve J mounted on the fuel distribution pipe B is opened / closed, a reflected wave is generated to cause pulsation in the fuel distribution passage, and this pulsation acts in the first chamber 4 via the fuel outflow passage 6. To do. That is, the fuel pulsation acts in the first chamber 4.

On the other hand, the pressurized gas generated by a gas pressurizing device (not shown) such as an air pump is supplied into the second chamber 5 through the air introducing passage 7,
The pressure of the pressurized gas applied in the second chamber 5 is preferably maintained at the same pressure as the fuel pressure acting in the first chamber 4. The fuel pulsation damper A may be disposed separately from the fuel distribution pipe B or may be integrally disposed by a screw member.

This was verified by the following test results. A fuel having a pressure of 2.3 Kg / Cm2 and a swing range of ± 0.15 Kg / Cm2 was added to the first chamber 4. (It means that pressurized fuel having pulsation was added) On the other hand, gases having different pressures were added to the second chamber 5. For the flat plate-shaped partition body 3, a fluororubber with a base cloth having a plate thickness of 0.8 mm was used. Then, when the pressure of the gas applied to the second chamber 5 was changed variously, the attenuation (corresponding to the swing width) of the fuel pulsation in the first chamber 1 was measured and confirmed.

The test results are shown in FIGS. 3 to 12, and the pressurized gas added to the second chamber 5 and the first gas
The table below summarizes the damping of fuel pulsation in the chamber 4. From the above test results, it is understood that the most effective pulsation damping in the first chamber 4 was achieved when the pressure of the pressurized gas applied to the second chamber 5 was 2.3 Kg / Cm 2. It That is, the pulsation of the fuel pressure of 2.3 ± 0.15 (Kg / Cm2) applied to the first chamber 4 could be attenuated to 2.3 + 0, -0.005 (Kg / Cm2).

On the other hand, the test result shown in FIG.
A liquid having a pressure of 2.3 Kg / Cm2 is added to the chamber 5, and the inside of the first chamber 4 is 2.3 in this case.
+0.0425, -0.08 (Kg / Cm2),
The fluctuation range of the pulsation is 0.1225 (Kg / Cm2), and even if a liquid pressurized to the same pressure as the pressure in the first chamber 4 is added to the second chamber 5, a large pulsation is generated. It is understood that there is no damping effect.

Next, FIG. 14 to FIG. 23 show test results in another embodiment. In this embodiment, the material of the partition 3 is
Board thickness is different. The pressure in the first chamber 4 is 2.3 Kg / Cm.
2 and the fuel having a swing range of ± 0.15 Kg / Cm 2 was added, while in the second chamber 5, gases with different pressures were added. It should be noted that the flat plate-shaped partition 3 has 0.1
Polyphenylene sulfide with a plate thickness of mm was used. Then, when the pressure of the gas applied to the second chamber 5 was changed variously, the attenuation (corresponding to the swing width) of the fuel pulsation in the first chamber 1 was measured and confirmed.

The results of this test are shown in FIGS. 13 to 22, and the sum of the pressurized gas added to the second chamber 5 and the damping of the fuel pulsation in the first chamber 4 is as shown in the table below. Becomes From the above test results, it is understood that the most effective pulsation damping in the first chamber 4 was achieved when the pressure of the pressurized gas applied to the second chamber 5 was 2.3 Kg / Cm 2. It That is, the pulsation of the pressure of the fuel applied to the first chamber 4 of 2.3 ± 0.15 (Kg / Cm2) is 2.3 + 0.0075, -0.005 (Kg / Cm2).
It was proved that effective attenuation can be achieved even if at least polyphenylene sulfide is selected as the material of the partition body 3.

The above-mentioned polyphenylene sulfide is in the form of a film and has high strength and high rigidity. Among them, the specific elasticity and the specific strength are the same as those of metal, so a thin metal plate is used as the material of the partition body 3. In adopting it, by appropriately selecting the plate thickness, it is possible to obtain a pulsation damping effect equivalent to that of fluororubber containing a base cloth and polyphenylene sulfide. For example, a stainless steel plate having a thickness of 0.05 mm is used.

FIG. 24 shows another embodiment of the fuel pulsation damper A. At one end B2 of the fuel distribution pipe B, a first recess B3 that opens toward one side F (left in FIG. 23) is formed, and further this first recess B3.
A collar portion B4 is formed at the opening end of the. And the first recess B
At the bottom of 3, the fuel distribution passage B1 is formed in the fuel distribution pipe B.
Is opened, and a fuel passage C communicating with the fuel pump 27 is opened in the side wall of the first recess B3. Reference numeral 8 denotes a cover having a second recess 8A that opens toward the other side G (right side in FIG. 23) and a flange 8B at the opening end of the second recess 8A, and a flange B4 of the first recess B3. After arranging the partition body 3 on the upper side, the collar portion 8B of the cover 8 is arranged and fixed.

According to the above, the other side 3A of the partition 3 and the first
The first chamber 4 is formed by the recess B3, and the second chamber 5 is sectioned by the one side 3B of the partition 3 and the second recess 8A. The fuel passage C and the fuel distribution passage B1 are opened in the first chamber 4 as described above, while the air introduction passage 7 is opened in the second chamber 5.

When the fuel pump 27 is operated, the discharge pressure of the fuel discharged from the fuel pump 27 changes periodically to cause pulsation, and this pulsation passes through the fuel flow path C to the first position. Acts in the one chamber 4. On the other hand, when the fuel injection valve J attached to the fuel distribution pipe B is opened / closed, a reflected wave is generated to cause pulsation in the fuel distribution passage B1, and this pulsation acts from the fuel distribution passage B1 into the first chamber 4. . Then, the pressure of the pressurized gas having the same pressure as the fuel pressure acting in the first chamber 4 is caused to act in the second chamber 5 via the air introduction path 7. According to the above, the fuel pulsation in the first chamber 4 can be greatly attenuated by the same operation as in the first embodiment. According to the present embodiment, the one end B2 of the fuel distribution pipe B can be directly used without providing the first housing, so that the number of parts and the number of assembling steps can be reduced and the manufacturing cost can be reduced. it can. Further, the pulsation generated in the fuel distribution passage B1 due to the opening / closing operation of the fuel injection valve J directly acts in the first chamber 4 without passing through any other member, so that the pulsation generated in the fuel distribution passage B1 is changed over time. It can be damped more effectively without delay. Furthermore, it is not necessary to provide a special fixing means for fixing the fuel pulsation damper A to another member.

FIG. 25 shows still another embodiment. Incidentally, FIG.
The same structural parts as those of No. 4 are denoted by the same reference numerals and the description thereof is omitted. A cylindrical air cylinder 10 is bored in the cover 8, and a pressure piston 11 is slidably arranged in the air cylinder 10 in an airtight state. In this pressurizing piston, a plurality of labyrinth grooves 1 are used to obtain airtightness.
1A was drilled. Then, one side 1 of the pressurizing piston 11
The air cylinder 10 of 1B has a piston operation flow path 10
A is formed, and a pressure passage 10B is formed in the air cylinder 10 on the other side 11C of the pressure piston 11. The pressurizing flow passage 10B communicates with the inside of the second chamber 5, and the piston operation flow passage 10A communicates with the fuel flow passage C. The gas pressurization device R was formed by the above.

According to the above structure, the fuel pressurized by the fuel pump 27 flows into the first chamber 4 through the fuel passage C, and the fuel distribution passage B1 of the fuel distribution pipe B is introduced from the first chamber 4.
Flows in. Then, the fuel pulsation generated by the operation of the fuel pump 27 acts into the first chamber 4 through the fuel flow passage C, and the pulsation generated by the operation of the fuel injection valve J passes through the fuel distribution passage B1. It acts into the first chamber 4. On the other hand, the pressurized fuel flowing in the fuel flow path C reaches the piston operation flow path 10A of the air cylinder 10, whereby the one side 11B of the pressurizing piston 11 moves downward due to the pressurized fuel. The pressure piston 11 is pressed toward the pressure channel 10B, and the pressure piston 11 compresses the pressure channel 10B. With the above downward movement of the pressurizing piston 11, the volume of the pressurizing passage 10B decreases and the gas pressure in the pressurizing passage 10B gradually rises. The downward movement of the pressure piston 11 is continued until the pressure P1 applied to the one side 11B of the pressure piston 11 and the pressure P2 applied to the other side 11C of the pressure piston 11 become the same pressure. , Keep pressing. That is, the pressure of the fuel flowing in the fuel passage C is 2.
In the case of 3 (Kg / Cm2), when the gas pressure in the pressurizing flow path 10B rises to 2.3 (Kg / Cm2),
The pressing movement of the pressure piston 11 is stopped. Then, the pressure of the gas in the pressurizing flow path 10B is introduced into the second chamber 5.

According to the above, 2.3 kg from the fuel flow path C
/ Cm2, the fuel in a pulsating state flows into the first chamber 4, while the gas pressurized to 2.3 Kg / Cm2 from the pressurizing passage 10B toward the second chamber 5 is the second chamber. Acts within 5. Therefore, the pressure of the fuel applied to the first chamber 4 and the pressure of the gas applied to the second chamber 5 can be maintained at the same pressure, so that the fuel pulsation is the same as in the above embodiment. It was able to be effectively damped.

Then, in this embodiment, the pressure increase of the gas applied to the second chamber 5 is caused by the gas pressurizing device R operated by the pressure of the fuel flowing in the fuel passage C, and Since pressurized gas is used, there is no need to prepare a special drive source such as electricity, and its implementation is extremely easy. Further, the pressure of the fuel flowing in the fuel flow path C takes different values in various operating states such as idling and fully opening. Can occur. Therefore, the fuel pulsation damping effect can be improved over the entire operating region. Also, this gas pressurizing device R
Even if, for example, the partition body 3 is damaged and fuel flows into the second chamber 5, the pressurized flow channel 10B that is connected and opened to the second chamber 5
Is a pressure piston 1 arranged in the air cylinder 10.
Since 1 forms a blind hole, that is, a closed circuit, fuel does not leak to the outside. Even if the fuel flows into the piston operation flow passage 10A side through the pressurizing piston 11, the piston operation flow passage 10A forms a connection opening, that is, a closed circuit in the fuel flow passage C, so that the fuel leaks to the outside. There is nothing to do. Further, since the gas pressurizing device R is integrally arranged on the cover 8, the number of parts relating to piping and the number of assembling steps can be reduced, and the fuel pulsation damper including the gas pressurizing device R can be compactly assembled. it can. The gas pressurizing device R is not necessarily the cover 8
Need not be one with. In short, the pressure of the gas flowing through the fuel flow path C may be used to operate the gas pressurizing device R to increase the pressure of the gas to the same pressure as the fuel.

[0034]

As described above, according to the first aspect of the present invention, the first chamber divided by the partition body is opened by being connected to the fuel flow passage or the fuel distribution passage of the fuel distribution pipe. The pressurized fuel is supplied, the pressurized gas is supplied to the second chamber, and the pressure of the fuel in the first chamber and the pressure of the gas in the second chamber are kept at the same pressure state. It is possible to provide an accumulator having a high damping effect because the pulsation of the acting fuel can be largely damped.

Further, according to the second aspect of the present invention, since one end of the fuel distribution pipe is directly used as the first housing of the fuel pulsation damper, the number of parts and the number of assembling steps can be reduced. Was able to compact the fuel pulsation damper itself.
Further, the fuel distribution passage and the first chamber can be directly opened to the first chamber without passing through another flow passage, so that the pulsation generated in the fuel distribution passage is not time-delayed. It was able to be damped more effectively.

Further, according to the third aspect of the present invention, since the partition body is formed of the fluororubber containing the base cloth, it is possible to provide a fuel pulsation damper having excellent chemical resistance, weather resistance and heat resistance, and particularly an internal combustion engine. It is suitable as a fuel pulsation damper used in an engine, and since a seal ring for holding the first chamber and the second chamber in an airtight state is formed in the partition body itself, in order to keep the chamber airtight. No special sealing member is required.

According to the fourth aspect of the present invention, since the partition body is made of polyphenylene sulfide, it has the same specific elasticity and specific strength as the metal material, as well as excellent fatigue characteristics and creep resistance. It can be used in a high temperature range of 200 ° C. to 220 ° C. and has chemical resistance comparable to that of a fluororesin, so that the degree of freedom in use can be further increased. Further, since it is a thermoplastic resin material, its production can be extremely easily obtained by injection molding, and in particular, the productivity can be improved as compared with a rubber material.

Further, according to the fifth aspect of the present invention, since the partition body is formed of a thin metal plate, it is suitable as a fuel pulsation damper for an internal combustion engine having particularly severe vibration conditions.

Still further, according to the sixth aspect of the present invention, the gas pressurizing device is operated by the pressurized fuel added to the first chamber so that the gas pressure pressurized to the same pressure as the fuel is maintained. It is generated and this pressurized gas is introduced into the second chamber. Therefore, since it is not necessary to operate the gas pressurizing device by a special drive source such as electricity, the gas pressure device can be easily implemented. Further, the pressure of the fuel flowing in the fuel flow passage has different values in various operating states, for example, at the time of idling, when fully opened, etc., but this gas pressurizing device always generates a gas pressure corresponding to the fuel pressure. can do. Therefore, the fuel pulsation damping effect is
It will be possible to improve over the entire operating range. Further, even if the partition body is damaged and the fuel flows into the second chamber, the gas pressurizing device has a pressurizing flow path that is connected and opened to the second chamber by the pressurizing piston arranged in the air cylinder. Since a blind hole, that is, a closed circuit is formed, no fuel leaks to the outside. Even if the fuel flows into the piston operation flow path side through the pressurizing piston, the piston operation flow path forms a connection opening, that is, a closed circuit in the fuel flow path, so that the fuel does not leak to the outside.

[Brief description of drawings]

FIG. 1 is a fuel system diagram including a fuel pulsation damper in an internal combustion engine.

FIG. 2 is a longitudinal sectional view showing an embodiment of a fuel pulsation damper in the fuel supply system for an internal combustion engine of the present invention.

FIG. 3 is a diagram showing the first section using a fluororubber containing a base cloth as a compartment.
FIG. 6 is a diagram showing a relationship between pressure and time in the first chamber in a state where a gas pressure of 1.0 Kg / Cm2 is applied to the second chamber when a pulsating pressure of 2.3 Kg / Cm2 of liquid is applied to the chamber.

FIG. 4 is a diagram showing the first section using a fluororubber containing a base cloth as a compartment.
FIG. 6 is a diagram showing the relationship between pressure and time in the first chamber when a pulsating pressure of a liquid of 2.3 Kg / Cm 2 is applied to the chamber and a gas pressure of 1.5 Kg / Cm 2 is applied to the second chamber.

[FIG. 5] First, using a fluororubber containing a base cloth as a partition,
FIG. 6 is a diagram showing a relationship between pressure and time in the first chamber in a state where a gas pressure of 2.0 Kg / Cm2 is applied to the second chamber when a pulsating pressure of liquid of 2.3 Kg / Cm2 is applied to the chamber.

FIG. 6 is a diagram showing the first section using a fluororubber containing a base cloth as a compartment.
FIG. 6 is a diagram showing a relationship between pressure and time in the first chamber in a state where a gas pressure of 2.1 Kg / Cm2 is applied to the second chamber when a pulsating pressure of liquid of 2.3 Kg / Cm2 is applied to the chamber.

[FIG. 7] The first section is made of fluororubber containing a base cloth as a partition body.
FIG. 6 is a diagram showing a relationship between pressure and time in the first chamber in a state where a gas pressure of 2.2 Kg / Cm2 is applied to the second chamber when a pulsating pressure of liquid of 2.3 Kg / Cm2 is applied to the chamber.

FIG. 8 is a diagram showing the first section using a fluororubber containing a base cloth as a partition body.
FIG. 6 is a diagram showing a relationship between pressure and time in the first chamber in a state where a gas pressure of 2.3 Kg / Cm2 is applied to the second chamber when a pulsating pressure of liquid of 2.3 Kg / Cm2 is applied to the chamber.

FIG. 9 is a diagram showing the first section using a fluororubber containing a base cloth as a compartment.
FIG. 6 is a diagram showing a relationship between pressure and time in the first chamber in a state where a gas pressure of 2.4 Kg / Cm2 is applied to the second chamber when a pulsating pressure of 2.3 Kg / Cm2 of liquid is applied to the chamber.

FIG. 10: Using a fluororubber containing a base cloth as a compartment, when a pulsating pressure of a liquid of 2.3 Kg / Cm2 was applied to the first chamber, a gas pressure of 2.5 Kg / Cm2 was applied to the second chamber. FIG. 6 is a diagram showing a relationship between pressure and time in the first chamber in a state.

FIG. 11: Fluorine rubber containing base cloth was used as a compartment, and when a pulsating pressure of a liquid of 2.3 Kg / Cm2 was applied to the first chamber, a gas pressure of 2.7 Kg / Cm2 was applied to the second chamber. FIG. 6 is a diagram showing a relationship between pressure and time in the first chamber in a state.

[Fig. 12] A fluororubber containing a base cloth was used as a compartment, and when a pulsating pressure of a liquid of 2.3 Kg / Cm2 was applied to the first chamber, a gas pressure of 3.0 Kg / Cm2 was applied to the second chamber. FIG. 6 is a diagram showing a relationship between pressure and time in the first chamber in a state.

[Fig. 13] A fluororubber containing a base cloth is used as a compartment, and when a pulsating pressure of a liquid of 2.3 Kg / Cm2 is applied to the first chamber, a liquid pressure of 2.3 Kg / Cm2 is applied to the second chamber. FIG. 6 is a diagram showing a relationship between pressure and time in the first chamber in a state.

FIG. 14 is a graph showing a state where a gas pressure of 1.0 Kg / Cm2 is applied to the second chamber when a pulsating pressure of a liquid of 2.3 Kg / Cm2 is applied to the first chamber using polyphenylene sulfide as a compartment. The diagram which shows the relationship between the pressure in one room, and time.

FIG. 15 is a graph showing a state in which a gas pressure of 1.5 Kg / Cm2 is applied to the second chamber when a pulsating pressure of a liquid of 2.3 Kg / Cm2 is applied to the first chamber using polyphenylene sulfide as a compartment. The diagram which shows the relationship between the pressure in one room, and time.

FIG. 16 is a graph showing a state where a gas pressure of 2.0 Kg / Cm2 is applied to the second chamber when a pulsating pressure of a liquid of 2.3 Kg / Cm2 is applied to the first chamber using polyphenylene sulfide as a compartment. The diagram which shows the relationship between the pressure in one room, and time.

FIG. 17 is a graph showing a state in which a gas pressure of 2.1 Kg / Cm2 is applied to the second chamber when a pulsating pressure of 2.3 Kg / Cm2 of a liquid is applied to the first chamber using polyphenylene sulfide as a compartment. The diagram which shows the relationship between the pressure in one room, and time.

[Fig. 18] Fig. 18 is a view showing a state where a gas pressure of 2.2 Kg / Cm2 is applied to the second chamber when a pulsating pressure of a liquid of 2.3 Kg / Cm2 is applied to the first chamber using polyphenylene sulfide as a compartment. The diagram which shows the relationship between the pressure in one room, and time.

FIG. 19 is a diagram showing a state in which a gas pressure of 2.3 Kg / Cm2 is applied to the second chamber when a pulsating pressure of liquid of 2.3 Kg / Cm2 is applied to the first chamber using polyphenylene sulfide as a partition. The diagram which shows the relationship between the pressure in one room, and time.

[Fig. 20] Fig. 20 is a graph showing a state in which a gas pressure of 2.4 Kg / Cm2 is applied to the second chamber when a pulsating pressure of a liquid of 2.3 Kg / Cm2 is applied to the first chamber using polyphenylene sulfide as a compartment. The diagram which shows the relationship between the pressure in one room, and time.

[Fig. 21] Fig. 21 is a graph showing a state in which a gas pressure of 2.5 Kg / Cm2 is applied to the second chamber when a pulsating pressure of a liquid of 2.3 Kg / Cm2 is applied to the first chamber using polyphenylene sulfide as a compartment. The diagram which shows the relationship between the pressure in one room, and time.

FIG. 22 is a graph showing a state in which a gas pressure of 2.7 Kg / Cm2 is applied to the second chamber when a pulsating pressure of liquid of 2.3 Kg / Cm2 is applied to the first chamber using polyphenylene sulfide as a compartment. The diagram which shows the relationship between the pressure in one room, and time.

FIG. 23 is a graph showing a state in which a gas pressure of 3.0 Kg / Cm2 is applied to the second chamber when a pulsating pressure of a liquid of 2.3 Kg / Cm2 is applied to the first chamber using polyphenylene sulfide as a compartment. The diagram which shows the relationship between the pressure in one room, and time.

FIG. 24 is a longitudinal sectional view showing another embodiment of the fuel pulsation damper according to the present invention.

FIG. 25 is a vertical sectional view showing still another embodiment of the fuel pulsation damper according to the present invention.

[Explanation of symbols]

 3 Partition 3A Other Side 3B One Side 4 First Chamber 5 Second Chamber 6 Fuel Outflow Channel 10 Air Cylinder 10A Piston Operation Flow Channel 10B Pressurized Flow Path 11 Pressurized Piston 11B One Side 11C Other Side B Fuel Distribution Pipe B1 Fuel Distribution Channel C Fuel channel A Fuel pulsation damper R Gas pressurizer 27 Fuel pump

Claims (6)

[Claims] 1. A fuel distribution pipe having a fuel distribution passage formed therein, the fuel distribution pipe having a fuel injection valve for controlling and injecting fuel from the fuel distribution passage toward an intake pipe, and fuel in a fuel tank. A fuel supply device for an internal combustion engine, comprising: a fuel pump for supplying fuel to a fuel distribution pipe; a fuel pump; and a fuel pulsation damper arranged in a fuel flow passage including a fuel distribution passage of the fuel distribution pipe. The pulsation damper comprises a flat plate-shaped partition 3 and a first chamber 4 and a second chamber.
In the first chamber 4, a fuel flow passage C connected to the fuel pump 27 and a fuel outflow passage 6 connected to the fuel distribution passage B1 of the fuel distribution pipe B are opened and fuel is introduced into the first chamber 4.
On the other hand, a fuel in a fuel supply system for an internal combustion engine, characterized in that a pressurized gas having the same gas pressure as the fuel pressure introduced into the first chamber 4 is introduced into the second chamber 5. Pulsation damper. 2. One end F of the fuel distribution pipe B is connected to one end B2.
Is provided with a first recessed portion B3 having a flange portion B4, and a cover 8 having a second recessed portion 8A is disposed on the flange portion B4 with the partition body 3 interposed between the first recessed portion B3 and the partition body 3. A first chamber 4 is formed on the other side 3A, and a second chamber 5 is formed on the second recess 8A and one side 3B of the partition body 3, and a fuel flow communicating with the fuel pump 27 is formed in the first chamber 4. The fuel is introduced by opening the fuel distribution passage B1 of the passage C and the fuel distribution pipe B, while the second chamber 5 has a gas pressure of the same pressure as the fuel pressure introduced into the first chamber 4. 2. A fuel pulsation damper in a fuel supply system for an internal combustion engine according to claim 1, wherein pressurized gas is introduced. 3. The fuel pulsation damper in the fuel supply system for an internal combustion engine according to claim 1, wherein the flat plate-shaped partition body 3 is formed of fluororubber containing a base cloth. 4. The fuel pulsation damper in the fuel supply system for an internal combustion engine according to claim 1, wherein the flat plate-shaped partition body 3 is formed of polyphenylene sulfide. 5. The fuel pulsation damper in a fuel supply system for an internal combustion engine according to claim 1, wherein the flat plate-shaped partition body 3 is formed of a thin metal plate. 6. A fuel distribution pipe having a fuel distribution passage formed therein, the fuel distribution pipe having a fuel injection valve for controlling and injecting fuel from the fuel distribution passage toward an intake pipe, and fuel in a fuel tank, A fuel supply system for an internal combustion engine, comprising: a fuel pump for supplying fuel to a fuel distribution pipe; a fuel pump; and a fuel pulsation damper arranged in a fuel flow path including a fuel distribution passage of the fuel distribution pipe. The sation damper A is formed by dividing the first chamber 4 and the second chamber 5 by the flat partition 3 and the first chamber 4 has a fuel flow path C and a fuel distribution pipe B which communicate with the fuel pump 27. To form fuel by opening the fuel distribution path B1 of
The gas pressurizing device R is provided with a piston operation flow passage 10A in the air cylinder 10 on one side 11B of the pressurizing piston 11 slidably arranged in the air cylinder 10, and on the other side 11C of the pressurizing piston 11. The air cylinder 10 is formed with a pressurizing flow path 10B, the piston operating flow path 10A of the gas pressurizing device R is connected to the fuel flow path C, and the pressurizing flow path 10B is connected to the second chamber 5. And pressure channel 1
The pressure of the gas applied to the second chamber 5 via
A fuel pulsation damper in a fuel supply system for an internal combustion engine, characterized in that the pressure of fuel applied to the chamber 4 is made equal.