JP2001055962A - Fuel pressure control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel pressure control valve which shows excellent responsiveness and pressure governing performance in supplying fuel, and can automatically rest the pressure of the fuel to a specified value especially when it is temporarily lowered. SOLUTION: A partitioning body 7 having a valve part 8 is sandwiched between a diaphragm sandwiching flat portion 1A and a cover 10 on one side X of a valve main body 1. A fuel chamber 12 is formed on the side of the valve main body 1, while a spring chamber 11 is formed on the side of the cover 10. A fuel inflow passage 3 extended to a boosting part P, a fuel outflow passage extended to a consumption part, and a fuel return passage 5 having a valve seat are opened to the fuel chamber 12. A partitioning body 9 is sandwiched between a cover attaching flat portion 2A and a cover 14 on the other side Y of a devise main body 2. An accumulating chamber 16 is formed on the side of the device main body 2, while an atmospheric chamber 15 is formed on the side of the cover 14. The partitioning body 9 is energized to the side of the accumulation chamber 16 by means of a spring S. The accumulating chamber 16 is communicated with the fuel outflow passage through a pressure introduction passage 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel pressurized by a pressurizing section, in which a part of the fuel is discharged through a fuel return passage by the pressure of the fuel, whereby the fuel is adjusted to a constant pressure from a fuel outflow passage. The present invention relates to a fuel pressure control valve for supplying fuel to a consuming unit, and is used, for example, in a fuel supply device of an internal combustion engine.

[0002]

2. Description of the Related Art A conventional fuel pressure control valve is disclosed in
No. 4718. According to this, a partition body having a valve body is sandwiched between the upper end of the valve body and the lower end of the cover, and the partition body forms a fuel chamber on the valve body side and a spring chamber is formed separately on the cover side. . The fuel chamber has a concave shape that is deeper downward from the upper end of the valve body, and a fuel inflow passage and a fuel outflow passage are opened at or near the bottom of the fuel chamber, and a valve seat that is opened and closed by the valve body. The provided fuel return passage extends from the bottom of the fuel chamber toward the vicinity of the upper end of the valve body. Further, the fuel inflow path is connected to the pressure increasing section, and the fuel outflow path is connected to the consuming section. When the fuel pressurized by the pressurizing unit flows from the fuel inflow passage into the fuel chamber, the partition body operates according to the pressure in the fuel chamber.
When the fuel pressure in the fuel chamber rises above a predetermined pressure, the partition body is displaced toward the spring chamber, the valve body opens the valve seat, and discharges fuel from the fuel return passage. According to the above, the pressure in the fuel chamber is controlled to a predetermined pressure, and the fuel controlled to the predetermined pressure is supplied from the fuel outflow passage to an external consuming portion.

[0003]

Such a conventional fuel pressure control valve has the following disadvantages. (1) When fuel is supplied from the fuel inflow passage into the fuel chamber with the fuel pressure control valve being empty, the supply of fuel controlled at a predetermined pressure from the fuel outflow passage to the outside can be immediately performed. This is not preferable because a start delay occurs during the start operation of the engine. This is because the fuel chamber was formed in a concave shape deeper downward from the upper end of the valve body. And that the fuel inflow passage and the fuel outflow passage are opened at the bottom of the fuel chamber. Further, the fuel return passage is provided near the upper end of the valve body from the bottom of the fuel chamber. by. (2) When fuel is supplied from the fuel inflow passage into the fuel chamber while the fuel pressure control valve is empty, a large amount of air flows out from the fuel outflow passage to the outside to supply accurate fuel to the engine. It is not preferable because it is difficult and hinders the operability of the engine. This is due in particular to the fact that the fuel chamber has a deep concave shape. (3) It is difficult to supply fuel having a high pressure regulation effect from the fuel outflow passage. This is because the fuel inflow passage and the fuel return passage open into the fuel chamber with large openings. (4) When the pressure of the fuel introduced into the fuel inflow passage from the booster temporarily decreases, the fluid pressure directed to the consumer also decreases in synchronization with the supply of the fluid determined by the consumer. Can not. For example, when a pulsating-pressure diaphragm fuel pump (hereinafter simply referred to as a fuel pump) is used as a booster, the pulsating pressure for driving the fuel pump temporarily decreases, and the fuel introduced from the fuel pump into the fuel inflow passage is reduced. When the pressure of the fuel injector temporarily decreases, the fuel having the reduced pressure is supplied to the fuel injector as the consuming part. According to this, the valve opening time of the fuel injector is controlled to a predetermined time. Even in this case, the amount of fuel injected from the fuel injection valve toward the engine is temporarily reduced corresponding to the pressure decrease.

[0004] The fuel pressure control valve according to the present invention has been made in view of the above-mentioned problem. In particular, when the fuel chamber of the fuel pressure control valve is supplied with fuel through the fuel inflow passage from an empty state, the fuel is immediately supplied. To provide a fuel pressure control valve capable of supplying accurate fuel regulated from an outflow passage, and having a small pulsation pressure and capable of supplying fuel having a high pressure regulation effect. When the pressure of the fluid introduced into the fuel inflow path from the pressurizing section temporarily drops to a pressure equal to or lower than a certain value, the pressure drop is suppressed and the pressure is automatically raised to the original pressure and returned. To provide a fuel pressure control valve capable of operating. With the goal.

[0005]

In order to achieve the above object, a fuel pressure control valve according to the present invention has a fuel chamber recess opening toward a diaphragm sandwiching flat portion, and a fuel chamber recess opening toward the fuel chamber recess. A valve body including a valve seat connected to the fuel return passage, a fuel inflow passage, and a fuel outflow passage, a valve body for opening and closing the valve seat, a partition body disposed on the diaphragm sandwiching flat portion, and a partition body. The valve body comprises a bottomed cup-shaped cover sandwiched on the diaphragm sandwiching flat portion of the valve body, and a fuel chamber is formed by the other side surface of the partition body and the fuel chamber recess of the valve body.
A fuel pressure control valve in which a spring chamber in which a spring is contracted by one side surface and the cover is formed,
A compression body is formed on the device body side by the partition body sandwiched between the device body and the cover, an air chamber is formed on the cover side, and a spring for urging the partition body toward the pressure storage chamber side is formed in the atmosphere chamber. The first feature is that the pressure accumulator is provided in a contracted manner, and a pressure introduction path is branched from a fuel outflow path of the fuel pressure control valve to communicate with a pressure accumulator chamber of the pressure accumulator.

In addition to the first feature, the present invention provides a fuel pressure control valve having a valve main body and a pressure accumulator device main body as a common main body, and a fuel chamber of the fuel pressure control valve provided on one side of the main body. The second feature is that a pressure accumulating chamber of a pressure accumulating device is formed on the other side, and a pressure introducing passage is formed in the main body.

[0007] In addition to the first feature, the present invention provides a fuel pressure control valve, wherein a fuel chamber concave portion is formed near a diaphragm sandwiching flat portion and a fluid pressure does not act on the pressure accumulating chamber. A third feature is that the side surface of the pressure accumulating chamber of the partition body abuts against the bottom of the accumulating chamber of the apparatus main body.

Further, the present invention provides, in addition to the first feature,
A fourth feature is that the pressure introduction passage is opened at a position above the pressure accumulation chamber in the direction of gravity, and a valve seat connected to the fuel return passage is disposed at a position above the pressure introduction passage.

Further, the present invention provides, in addition to the first feature,
A fifth feature is that a jet is arranged in one or both of the fuel inflow passage and the fuel return passage.

[0010]

According to the first feature of the present invention, when the pressure of the fuel flowing into the fuel chamber of the fuel pressure control valve rises above a certain value, the valve body opens the valve seat to release the fuel in the fuel chamber. The fuel is discharged to the outside through the return passage to reduce the pressure, whereby the fuel adjusted to a constant pressure is supplied from the fuel outflow passage toward the consuming portion. On the other hand, the fuel of a constant pressure flowing through the fuel outflow passage is introduced into the accumulator of the accumulator through the pressure introduction passage, and the partition of the accumulator is displaced toward the atmosphere chamber against the spring force of the spring. To increase the volume of the accumulator, and accumulate fluid pressure in the accumulator. Here, when the fuel pressure in the fuel outflow passage decreases to a pressure equal to or lower than a certain value and the pressure in the accumulator decreases in synchronization with this, the partition body is displaced toward the accumulator by the spring force of the spring and accumulates. , The pressurized fluid pressure in the accumulator can be made to act on the fuel outflow path via the pressure introduction path.

According to the second feature of the present invention, the valve body of the fuel pressure control valve and the device body of the pressure accumulator can be shared by a single body, and the pressure introduction passage can also be formed in the body.

According to a third feature of the present invention, when the supply of fuel from the booster is started in a state where the fuel chamber of the fuel pressure control valve and the accumulator of the accumulator are empty, the fuel immediately flows out of the fuel. It can be supplied from roads to consumers. This is because the chamber volume of the fuel chamber of the fuel pressure control valve and the chamber volume of the accumulator of the accumulator are made as small as possible.

According to a fourth feature of the present invention, when fuel is supplied into the accumulator, gas remaining in the accumulator can be immediately discharged from the pressure introduction passage toward the valve seat and the fuel return passage. it can.

According to the fifth aspect of the present invention, the pressure fluctuation of the fuel flowing into the fuel chamber from the fuel inflow passage or the pressure fluctuation of the fuel discharged from the fuel chamber via the fuel return passage can be suppressed. , The pressure fluctuation of the fuel discharged from the fuel outflow passage can be improved.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the fuel pressure control valve according to the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a valve body having a fuel chamber recess 1B that opens toward the diaphragm holding flat portion 1A on one side X, and reference numeral 2 denotes a device that has a pressure accumulation chamber recess 2B that opens toward the cover mounting flat portion 2A on the other side Y. In this example, the valve main body 1 and the apparatus main body 2 are formed of a single common main body B. The fuel chamber recess 1B is formed in the vicinity of the diaphragm sandwiching flat portion 1A, and has a shallow depth. 3 is a booster part P such as a fuel pump.
And is open to the fuel chamber recess 1B. Reference numeral 4 denotes a fuel outflow passage connected to the consuming portion T such as a fuel injection valve, which opens into the fuel chamber recess 1B. 5 is a fuel chamber recess 1B
Is a fuel return passage that opens through the valve seat 5A substantially at the center. Reference numeral 6 denotes a pressure introduction passage connecting the fuel outflow passage 4 and the accumulator recess 2B, and is formed in the main body B. Note that the pressure introduction path may be opened in the fuel chamber recess 1B. Reference numeral 7 denotes a partition such as a diaphragm disposed on the diaphragm sandwiching flat portion 1A, and a valve portion 8 capable of opening and closing the valve seat 5A is integrally disposed at the center thereof. Reference numeral 9 denotes a partition such as a diaphragm arranged on the cover mounting flat portion 2A, and a thick disk portion 9A is integrally formed in an inner portion of the partition 9.

The partition 7 is disposed on the diaphragm sandwiching flat portion 1A, and a bottomed cup-shaped cover 10 having an air hole formed thereon is disposed thereon. Diaphragm clamping flat part 1A
It is folded and squeezed to hold it. According to the above description, the outer peripheral portion of the partition 7 is sandwiched between the diaphragm holding flat portion 1A and the outer peripheral portion of the cover 10, and the spring chamber 1 is formed by one side surface 7X of the partition 7 and the cover 10.
1, the other side surface 7Y of the partition 7 and the fuel chamber recess 1B
Thus, the fuel chamber 12 is formed. The spring S
Reference numeral 1 denotes a spring which is contracted in the spring chamber 11 and presses the partition 7 toward the fuel chamber 12 to urge it.
A, which opens and closes the valve seat 5A. Further, the fuel inflow passage 3, the fuel return passage 5, and the fuel outflow passage 4 open to the fuel chamber 12.

The partition 9 is disposed on the cover mounting flat portion 2A, and a bottomed cup-shaped cover 14 having an air hole formed thereon is disposed thereon. In this state, the outer periphery of the cover 14 is mounted on the cover mounting flat portion 2A. It is screwed and fixed toward the flat portion 2A. According to the above description, the outer peripheral portion of the partition 9 is sandwiched between the cover mounting flat portion 2A and the outer peripheral portion of the cover 14, and the other side surface 9Y of the partition 9 and the cover 14
And the atmosphere chamber 15 is formed, and one side surface 9X of the partition body 9 is formed.
And the accumulator recess 2B form an accumulator 16.
Note that S2 is contracted in the atmosphere chamber 15 and the partition 9 is
This is a spring that presses and biases toward the 6th side. Said configuration can be said to be a pressure accumulator.

Next, the operation will be described. When the engine is stopped, the fuel pump P is in a non-driving state, and no pressurized fuel is supplied into the fuel inflow passage 3. According to the above, the partition body 7 is pressed by the spring S1 and is closest to the fuel chamber 12, and the valve section 8 closes and holds the valve seat 5A. On the other hand, the partition 9 is pressed by the spring S2 and is closest to the pressure accumulating chamber 16, and the side of the pressure accumulating chamber 9 B of the partition 9.
(Corresponding to the left side surface in the drawing of the thick disk portion 9A) abuts against the bottom 16A of the accumulator 16. Such a state is shown in FIG.

Next, when the engine starts operating, the fuel pump P is pulsated by, for example, pulsating pressure generated in the engine, and pressurized fuel is supplied to the fuel chamber 12 through the fuel inflow passage 3.
At this time, when the fuel pressure supplied to the fuel chamber 12 rises above a predetermined constant pressure, the partition 7 is pressed toward the spring chamber 11 against the spring force of the spring S1. The valve portion 8 which is displaced corresponding to the rise and moves synchronously with the partition 7 opens the valve seat 5A, and discharges the increased pressure to the outside through the fuel return passage 5. According to the above, the increased fuel pressure in the fuel chamber 12 is controlled by decreasing to the predetermined fuel pressure, and the fuel adjusted to the predetermined fuel pressure via the fuel outflow passage 4 is supplied to the fuel injection valve J. Supplied to.

On the other hand, the fuel flowing through the fuel outflow passage 4 is introduced into the accumulator 16 through the pressure introducing passage 6, whereby the partition 9 receives the fuel pressure in the accumulator 16 and Displaced toward the atmosphere chamber 15 against the spring force of the spring S2, the capacity of the accumulator 16 is increased, and fuel is stored in the accumulator 16. The partition 9 is displaced until the retainer 19 attached to the partition 9 contacts the step 14C inside the cover 14. This state is continuously maintained while the pressure of the fuel discharged from the fuel pump P toward the fuel chamber 12 and the fuel outflow passage 4 is equal to or higher than a certain pressure value.

In such a fuel pump P, the pressure of the fuel discharged from the fuel pump P may temporarily drop below a certain pressure value. For example, this corresponds to a sudden acceleration operation of the engine, which is caused by a temporary decrease in the pulsating pressure generated in the engine during the rapid acceleration operation. In such a state, the fuel pressure control valve according to the present invention can suppress a temporary decrease in the fuel pressure and can immediately return the fuel pressure to a constant pressure value. That is, when the pressure of the fuel acting from the pressure introducing passage 6 into the pressure accumulating chamber 16 falls below a certain pressure value, the partition 9 is immediately moved to the pressure accumulating chamber 1 by the spring force of the spring S2.
The fuel stored in the pressure accumulating chamber 16 is pressurized and pressurized, and the pressurized fuel is immediately displaced to the pressure introducing path 6. , And acts on the fuel injection valve J via the fuel outflow passage 4.
According to the above description, even if the pressure value of the fuel discharged from the fuel pump P temporarily drops to a certain pressure value or less, the fuel that has been pressurized by the accumulator 16 is immediately supplied to the fuel injection valve J. Thus, the fuel quantity injected from the fuel injection valve J does not temporarily decrease, and appropriate fuel can be supplied from the fuel injection valve J to the engine, whereby a favorable acceleration operation of the engine can be performed. Although the above description has been given of the case of the acceleration operation of the engine, when the pressure of the fuel discharged from the fuel pump P falls below a certain pressure value for some reason, the fuel pressure is similarly increased toward the certain pressure value. be able to.

Further, according to the fuel pressure control valve of the present invention, the volume of the fuel chamber 12 can be made extremely small, and the fuel pressure does not act on the accumulator 16 or the fuel pressure does not reach a constant pressure value. , Accumulator 16
Chamber volume can be kept to a minimum. This is because the fuel chamber 12 has the fuel chamber recess 1B formed near the diaphragm flat portion 1A. Further, in the accumulator 16, the accumulator chamber side surface 9B (corresponding to the left side surface of the thick disk portion 9A) of the partition body 9 abuts against the bottom 16A of the accumulator 16. According to the above, when the fuel pump P is driven in a state where the fuel chamber 12 and the accumulator 16 are empty, the fuel chamber 12 and the accumulator 16 are immediately filled with the fuel, and the fuel is discharged from the fuel outflow passage 4 with time. Fuel injection valve J without delay
Can be supplied to Therefore, when such a fuel pressure control valve is used in a fuel supply device of an internal combustion engine, fuel can be supplied to the engine at the same time as the start of the engine without time delay, thereby improving the response to start of the engine.

When the fuel chamber 12 and the accumulator 16 are empty, the fuel chamber 12 and the accumulator 16
When fuel is supplied into the fuel chamber, the air or fuel vapor in the fuel chamber 12 and the pressure accumulating chamber 16 is changed by the fuel flowing into the fuel outlet passage 4.
Alternatively, the fuel is discharged toward the fuel return passage 5. And
At this time, since the volume of the fuel chamber 12 could be reduced and the volume of the accumulator 16 could be reduced, the amount of air or fuel vapor flowing from the fuel outflow passage 4 to the fuel injection valve J could be reduced. Accurate fuel control can be performed in the fuel injection valve J. That is, when a large amount of air or fuel vapor is contained in the fuel directed to the fuel injection valve J, the amount of fuel actually supplied to the engine becomes unstable.

Further, the pressure introducing passage 6 is opened at a position above the pressure accumulating chamber 16 in the direction of gravity, and the valve seat 5A connected to the fuel return passage 5 is disposed above the pressure introducing passage 6 in the direction of gravity. When fuel is supplied into the accumulator 16 via the pressure introducing passage 6, the air or fuel vapor in the accumulator 16 converges to a position above it and is effectively discharged into the pressure introducing passage 6, and The air or fuel vapor discharged into the pressure introducing passage 6 moves upward due to its own buoyancy, and is discharged from the fuel return passage 5 through a valve seat 5A opened at an upper position. In the above,
Reducing the volume of the fuel chamber 12 also contributes to the effective discharge of the air or fuel vapor from the valve seat 5A. According to the above, when the partition 9 compresses the accumulator 16, the fuel in the accumulator 16 can be effectively pressurized. If air or fuel vapor remains in the accumulator 16, air compression is performed, and the pressure in the accumulator 16 cannot be sufficiently increased.

Further, the valve body 1 and the apparatus body 2 are formed into a single common valve body B, a fuel chamber 12 is formed on one side X, a pressure accumulating chamber 16 is formed on the other side Y, and a pressure is introduced. Road 6 with valve body B
According to this, the number of parts can be reduced and the size can be reduced. The pressure introduction path 6 does not need to use a pipe material or the like, and may be a simple passage.

J1 is a jet disposed in the fuel inflow passage 3, and the jet J1 regulates the fuel pressure from the fuel inflow passage 3 toward the fuel chamber 12. That is, when the pressure of the fuel flowing in the fuel inflow passage 3 forms a large pulsating pressure, the jet J1 suppresses the pressure on the positive pressure side, reduces the fluctuation width of the pulsating pressure, and supplies the fuel to the fuel chamber 12. According to the above, the pulsation of the fuel supplied from the fuel outflow passage 4 toward the fuel injection valve J can be reduced, which is suitable for regulating the pressure.

J2 is a jet disposed in the fuel return passage 5, and the jet J2 is
Control the fuel pressure from the air to the atmosphere. That is, when the valve seat 8 opens the valve seat 5A, the fuel pressure in the fuel chamber 12 is released from the fuel return passage 5 at once, and the fuel chamber 12 is opened.
According to the present invention, since the fuel pressure in the fuel chamber 12 is limited by the jet J2 and released, the pressure in the fuel chamber 12 is not greatly reduced. Thereby, the pulsation of the fuel supplied from the fuel outflow passage 4 toward the fuel injection valve J can be reduced. If the jet J1 is arranged in the fuel inflow passage 3 and the jet J2 is arranged in the fuel return passage 5, the above effects can be obtained in a synergistic manner.

[0028]

According to the present invention, a fuel chamber recess opening toward a diaphragm sandwiching flat portion, a valve seat opening toward the fuel chamber recess and connected to a fuel return passage, a fuel inflow passage, and a fuel A valve body having an outflow passage, a valve portion for opening and closing a valve seat, a partition disposed on a diaphragm clamping flat portion, and a bottomed cup shape for clamping the partition member on a diaphragm clamping flat portion of the valve body; A fuel chamber is formed by the other side surface of the partition body and the fuel chamber recess of the valve body, and a spring chamber in which a spring is contracted inside by one side surface of the partition body and the cover is formed. A pressure control valve, a pressure storage chamber is formed on the device main body side by the partition body sandwiched between the device main body and the cover, an air chamber is formed on the cover side, and the partition body is formed in the air chamber toward the pressure storage chamber side. The biasing spring is retracted The pressure introduction path is branched from the fuel outflow path of the fuel pressure control valve to communicate with the pressure accumulation chamber of the pressure accumulation apparatus, so that when the pressure in the fuel chamber rises above a predetermined pressure, a predetermined pressure is immediately applied. Regulated to fuel pressure,
This fuel is supplied to the consumer through the fuel outflow channel. Further, when the fuel pressure supplied from the booster to the fuel chamber temporarily decreases, the fuel pressurized by the pressure accumulator acts on the fuel outflow path, so that a temporary decrease in the fuel pressure can be suppressed. Therefore, a more stable fuel pressure can be supplied to the consuming portion, which is particularly preferable as a fuel pressure control valve used in a fuel supply device. Further, the valve body of the fuel pressure control valve and the device body of the pressure accumulator are used as a common body, a fuel chamber of the fuel pressure control valve is formed on one side of the main body, and a pressure accumulator of the pressure accumulator is formed on the other side. Further, since the pressure introducing passage is formed in the main body, it is preferable in reducing the number of parts and reducing the size. Further, the fuel chamber concave portion of the fuel pressure control valve is formed near the diaphragm sandwiching flat portion, and the side surface of the accumulator chamber of the compartment of the accumulator is located at the bottom of the accumulator chamber of the device body in a state where no fluid pressure acts on the accumulator. Since the contact is made, the fuel supply to the consuming unit can be performed without a time delay, and the amount of the air or the fuel vapor toward the consuming unit can be reduced, so that the stable supply of the fuel to the consuming unit can be performed. Further, since the pressure introduction passage is opened at a position above the pressure accumulation chamber in the direction of gravity, and a valve seat connected to the fuel return passage is arranged at a position above the pressure introduction passage, the air or fuel vapor is discharged from the pressure accumulation chamber well. The fuel pressure in the accumulator can be effectively compressed, and the pressure increasing effect can be improved. Furthermore, since the jet is arranged in one or both of the fuel inflow passage and the fuel return passage, pulsation from the fuel outflow passage toward the consuming portion can be reduced, and stable fuel can be supplied to the consuming portion.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a fuel pressure control valve according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve main body 1A Diaphragm clamping flat part 1B Fuel chamber recess 2 Device main body 3 Fuel inflow path 4 Fuel outflow path 5 Fuel return path 5A Valve seat 6 Pressure introduction path 7 Partition body 8 Valve part 9 Partition body 11 Spring chamber 12 Fuel chamber 15 Atmospheric chamber 16 Accumulator P Booster (fuel pump) J Consumer (fuel injector)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02M 55/00 F02M 55/00 EF Term (Reference) 3G066 AA01 AB02 AD10 BA12 BA19 BA61 BA67 CB11 CB13T CB15 CB16 CE13 CE16 CE34 DB01 DB16

Claims (5)

[Claims] 1. A fuel chamber recess 1B opening toward a diaphragm sandwiching flat portion 1A, a valve seat 5A opening toward the fuel chamber recess and connected to a fuel return passage 5, a fuel inflow passage 3, and a fuel outflow. A valve body 1 having a passage 4 and a valve seat 5
A is provided with a valve portion 8 for opening and closing the diaphragm A, and the diaphragm holding flat portion 1 is provided.
A, a partition 7 disposed on the valve body 1, a bottomed cup-shaped cover 10 for holding the partition 7 on the diaphragm holding flat portion 1A of the valve body 1, and the other side surface 7Y of the partition 7 and the valve body 1 A fuel pressure control valve in which a fuel chamber 12 is formed by the fuel chamber recess 1B, and a spring chamber 11 in which a spring S1 is contracted and formed by one side surface 7X of the partition body 7 and the cover 10; A pressure accumulating chamber 16 is formed on the device body 2 side by the partition 9 sandwiched between the cover 2 and the cover 14, an atmosphere chamber 15 is formed on the cover 14 side, and the pressure accumulating chamber 9 is stored in the atmosphere chamber 15. A pressure accumulator is provided in which a spring S2 biasing toward the chamber 16 is contracted. The pressure introducing path 6 is branched from the fuel outflow path 4 of the fuel pressure control valve and communicates with the pressure accumulator 16 of the pressure accumulator. Fuel pressure control valve. 2. The fuel pressure control valve valve body 1 and the pressure accumulator device body 2 are formed into a common body B, and a fuel chamber 12 of the fuel pressure control valve is formed on one side of the body and a fuel chamber 12 is formed on the other side. The fuel pressure control valve according to claim 1, wherein a pressure accumulating chamber (16) of the pressure accumulating device is formed, and a pressure introducing passage (6) is formed in the main body (B). 3. A pressure accumulating chamber side surface 9B of a partition 9 of a pressure accumulating device in a state where a fuel chamber recess 1B of the fuel pressure control valve is formed near a diaphragm sandwiching flat portion 1A and no fluid pressure acts on the pressure accumulating chamber 16. 2. The fuel pressure control valve according to claim 1, wherein the valve is in contact with a bottom portion 16A of the pressure accumulating chamber 16 of the apparatus main body 2. 4. The pressure introducing passage is opened at a position above the pressure accumulating chamber 16 in the direction of gravity, and a valve seat 5A connected to the fuel return passage 5 is disposed above the pressure introducing passage 6. Fuel pressure control valve. 5. The fuel pressure control valve according to claim 1, wherein jets J1 and J2 are arranged in one or both of the fuel inflow passage and the fuel return passage 5.