JP2518481Y2 - Fuel pressure control valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a fuel pressure control valve device, and more particularly to adjusting the pressure of fuel supplied to an injection valve used in a vehicle fuel injection device. The present invention relates to an effective fuel pressure control valve device.

[Conventional technology]

2. Description of the Related Art In a vehicle such as an automobile, a fuel pressure control valve device is used as a device for controlling the pressure of fuel supplied to a fuel injection valve to a constant value. This device, for example,
The pressure of fuel supplied to the injection valve is adjusted according to the intake pressure, and the amount of fuel injected from the fuel injection valve is always adapted to the operating state.

Conventionally, among the fuel pressure control valve devices of this type, the one described in Japanese Utility Model Publication No. 53-44325 and Japanese Utility Model Publication No. 62-24145 has been known as a control valve having a spherical body. There is.

When a sphere is used as the valve body of the control valve, as shown in FIG. 6, the armature 2 which is supported by the diaphragm 1 and moves in the fuel chamber, and the fuel which guides the fuel in the fuel chamber to the fuel outlet. A sphere 6 is arranged between the pole 3 forming the passage 4 and a seat 5 formed on the valve seat 5 formed in the middle of the fuel passage 4, and the sphere 6 separates from the seat 5 as the armature 2 moves. It is configured so that the passage 4 can be opened and closed. With this configuration, the structure of the control valve is simplified.

[Problems to be solved by the device]

However, in the conventional fuel pressure control valve device shown in FIG. 6, the spherical body 6 is inserted into the mortar-shaped valve seat 5 so as to be separated from and seated in the mortar-shaped valve seat 5. When the inside of the valve seat 5 is moved by the urging force of the spring 7 for constantly pressing the sphere 6, the sphere 6 may be displaced laterally, and the flow rate-pressure characteristic may be deteriorated. That is, the fuel amount corresponding to the pressure may not be discharged.

Therefore, as shown in FIG. 3, a sphere guide fuel passage 34 'is formed in the upper portion of the valve seat, and the sphere 38' is slidably accommodated in this passage, and the sphere guide fuel passage 34 'is accommodated. By forming vertical grooves 39 'as auxiliary fuel passages along the side walls of the passages along the plural normals, a means for preventing lateral displacement of the sphere and ensuring good fuel flow can be proposed. .

However, in this case, when each of the vertical grooves 39 'is opened along the normal, as shown in FIG. It has been clarified by the present inventor that turbulent flow occurs due to collision of the flows with each other, resulting in a phenomenon that the flow rate-pressure characteristic is deteriorated. This phenomenon becomes particularly noticeable at high flow rates.

An object of the present invention is to provide a fuel pressure control valve device capable of preventing deterioration of flow rate-pressure characteristics.

[Means for solving the problem]

A fuel pressure control valve device according to the present invention is provided with a case forming a fuel chamber and a pressure chamber, a fuel inlet and a fuel outlet provided on the fuel chamber side of the case, and a case on the pressure chamber side of the case. A pressure inlet, a diaphragm stretched between the fuel chamber and the pressure chamber so as to divide the case into two chambers, an armature supported by the diaphragm and inserted into the fuel chamber, and an armature. Disposed between the pole and the armature, a spring member for urging the fuel to the fuel chamber side, a pole provided in the fuel outlet of the case so as to form a fuel passage for guiding the fuel in the fuel chamber to the fuel outlet, And a sphere that opens and closes the fuel passage of the pole with the movement of the armature, the fuel passage of the pole (33) includes a sphere (38) capable of sliding the sphere (38). 38 Spherical guide fuel passage is opened slightly larger than the diameter (3
4) and a valve seat formed to have a smaller diameter than the spherical guide fuel passage (34) and to prevent fuel from flowing out by contact with the spherical body (38). (35)
And a fuel discharge fuel passage (36, 37) opened to guide the fuel from the valve seat (35) to the fuel discharge port (25) of the case (23), and a spherical guide fuel passage (34 ), An auxiliary fuel passage is provided penetrating the wall surface of the sphere, and a sphere (38) is slidably inserted in the sphere guide fuel passage (34) for discharging the fuel. The fuel passage (36, 37) is provided with an elastic member (41) for applying a biasing force to the spherical body (38) so that the spherical body (38) and the armature (30) are always in contact with each other. The fuel passage is characterized in that the extension line of the fuel passage is shifted from the center of the spherical guide fuel passage (34) so that a swirling flow is generated by the fuel flowing through the auxiliary fuel passage. .

[Action]

According to the above means, when the fuel is introduced into the fuel chamber and the pressure is introduced into the pressure chamber, the armature is balanced by the balance between the fuel pressure in the fuel chamber and the intake pressure in the pressure chamber and the biasing force of the spring member. Is determined, and the sphere moves in the fuel passage of the pole according to this position. Then, the fuel in the fuel chamber is discharged from the fuel outlet according to the position of the sphere. At this time, since the sphere moves in the sphere guide fuel passage, the moving direction of the sphere is restricted to a fixed direction. Moreover, since the swirling flow is generated by the auxiliary fuel passage formed in the spherical guide fuel passage, the fuel is circulated in the fuel passage without causing a turbulent flow.

For this reason, a constant flow rate of fuel is always discharged in accordance with the position of the armature, and a decrease in flow rate-pressure characteristics can be suppressed.

〔Example〕

FIG. 1 is an enlarged partial sectional view taken along line II of FIG. 2 showing a fuel pressure control valve device according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing the fuel pressure control valve device, and FIG. The figure is an enlarged partial sectional view for explaining the operation.

In this embodiment, the pressure regulator 20 as a fuel pressure control valve device is provided with a case 23 having a fuel chamber 21 and a pressure chamber 22, and a fuel inlet port 24 is provided on the side wall of the case 23 on the fuel chamber 21 side. It has been opened, and a mounting port 25 is opened on the bottom wall. A pipe 26 serving as a fuel introduction pipe is connected to the fuel introduction port 24. The pipe 26 is provided in the middle of a fuel passage for pumping fuel in a fuel tank to a fuel injection valve (neither is shown) by a pump. It is connected.
The fuel is introduced into the fuel chamber 21 by the pipe 26.

On the other hand, a pressure inlet 28 is provided on the ceiling wall of the pressure chamber 22 of the case 23.
The pressure introduction port 28 is connected to a pipe 29 as a pressure introduction pipe. The pipe 29 is connected in the middle of a pipe of an engine intake pipe (not shown), and the intake pressure is introduced into the pressure chamber 22 through the pipe 29.

A diaphragm 31 for dividing the inside of the case into a fuel chamber 21 and a pressure chamber 22 is movably stretched around the case 23, and the periphery of the diaphragm 31 is fixed to the inner wall surface of the case 23. The armature 30 is floatingly supported on the diaphragm 31, and the armature 30 is a pressure chamber.
It is urged toward the fuel chamber 21 by a compression spring 32 as a spring member inserted into the inside 22.

A pole 33 for forming a fuel passage is concentrically arranged and fixed to a mounting opening 25 at the bottom of the case 23. Pole
33 is formed in a substantially columnar shape, and a fuel passage is opened in the center. A pipe 27 as a discharge pipe is connected to the outer wall of the fuel passage of the pole 33. The pipe 27 is connected to a fuel tank, and is configured so that the fuel in the fuel chamber 21 is returned to the tank via the pipe 27.

A spherical guide fuel passage 34, into which a spherical body 38 as a valve body is inserted, is slidable on the inner end of the fuel passage.
It is slightly larger than the diameter of sphere 38. A plurality of vertical grooves 39, which form an auxiliary fuel passage, are formed on the wall surface of the fuel passage 34 so as to extend in the vertical direction at substantially equal intervals in the circumferential direction. As shown in detail, these flutes 39 are arranged so that their radial extension lines are displaced from the center point of the fuel passage and are translated in the circumferential direction from the normal line of the center point. Is formed.

At the lower end of the group of vertical grooves 39, a valve seat 35 is formed in a mortar shape whose diameter gradually decreases toward the fuel passage 34, and the valve seat 35 is a spherical body accommodated in the spherical guide fuel passage 34. It is formed so as to prevent the fuel from flowing out by contact with 38. Below the valve seat 35 is a fuel passage for fuel discharge.
36 and 37 are opened, and a step portion 40 is formed between the fuel passage 36 and the fuel passage 37. A spring 41 as an elastic member is inserted into the step portion 40. The spring 41 is configured to apply a biasing force to the sphere 38 so that the sphere 38 and the armature 30 are always brought into contact with each other.

 Next, the operation will be described.

When the fuel is introduced into the fuel chamber 21 through the pipe 26 and the intake pressure is introduced into the pressure chamber 22 through the pipe 29, the fuel pressure in the fuel chamber 21 and the intake pressure and spring in the pressure chamber 22 are introduced. The position of the armature 30 is determined by the balance with the biasing force of 32, and the sphere is determined according to the position of the armature 30.
38 moves in the spherical guide fuel passage 34. Then, the fuel amount corresponding to the position of the sphere 38 is discharged from the fuel discharge port 25. At this time, the sphere 38 is vertically moved while being prevented from moving in the radial direction by the sphere guide fuel passage 34, and the armature is urged by the urging force of the spring 41.
It moves in this fuel passage 34 while being in contact with 30. That is, since the spherical body 38 is prevented from moving in the radial direction when the valve operates, the moving direction of the spherical body 38 is always maintained in a constant direction (vertical direction). As a result, stabilization of the pressure-flow characteristics is ensured.

When the sphere 38 is seated on the valve seat 35 by the movement of the sphere 38, the outflow of fuel is blocked and the valve is closed. When the fuel passage is blocked by the contact between the sphere 38 and the valve seat 35, if the seating surface of the valve seat 35 is punched so as to match the curved surface of the sphere, the sealing performance of the valve seat can be further improved. it can.

In this embodiment, the fuel passage for the spherical guide is
Since a plurality of vertical grooves 39 as auxiliary fuel passages are formed in the auxiliary fuel passage 34, a large amount of fuel is discharged through the vertical groove 39 group even if the clearance between the spherical body 38 and the spherical guide fuel passage 34 is small. You can

By the way, as shown in FIG. 3, when the vertical grooves 39 'are respectively opened along the normal line of the center of the sphere guide fuel passage 34', they are indicated by broken line arrows in FIG. The fuel passing through each vertical groove 39 'is
Since they collide with each other in the 34 ', turbulent flow is generated, and as a result, the phenomenon that the passing flow rate becomes unstable occurs.

However, in the present embodiment, as shown in FIG. 1, since each vertical groove 39 is opened by being displaced from the center of the sphere guide fuel passage 34, it is indicated by a broken line arrow in FIG. The fuel passing through each vertical groove 39 is
Causes swirling flow within 34. By this swirling flow,
The fuel flowing into the fuel passage 34 will smoothly and stably flow into the fuel discharge passages 36 and 37 through the valve seat 35 while rotating. As a result, the flow rate of fuel passing through the ball guide fuel passage 34, the auxiliary fuel passage 39 group, the valve seat 35, and the fuel discharge passages 36 and 37 is stabilized, and the pressure-flow rate characteristics are further stabilized. .

Needless to say, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.

For example, the auxiliary fuel passage is not limited to the vertical groove shown in FIG. 1, but may be constructed as shown in FIGS. 4 and 5.

In FIG. 4, a plurality of vertical grooves 39A as auxiliary fuel passages, which are inclined with respect to the normal line, are arranged on the side wall of the spherical guide fuel passage 34 at substantially equal intervals in the circumferential direction, and the passage is extended. The line is opened so as to deviate from the center point of the fuel passage 34.

Also in this embodiment, as indicated by the broken line arrow in FIG. 4, the fuel that has passed through the vertical grooves 39A causes a swirling flow in the fuel passage 34, so the fuel that has flowed into the fuel passage 34 rotates. While passing through the valve seat 35, the fuel discharge passage 3
It flows into 6 and 37 smoothly and stably.

In FIG. 5, a plurality of spiral grooves 39B as auxiliary fuel passages are provided on the inner peripheral surface of the side wall of the spherical guide fuel passage 34 (only one is shown in FIG. 5), and the spiral grooves 39B are substantially equal in the circumferential direction. It is arranged at intervals and engraved in a spiral shape.

In the present embodiment, as indicated by the broken line arrow in FIG. 5, the fuel flowing into each spiral groove 39B flows along the spiral shape to cause a swirling flow in the fuel passage 34. . As a result, the fuel in the fuel passage 34 smoothly and stably flows into the fuel discharge passage 36 through the valve seat 35 while rotating.

[Effect of device]

As described above, according to the present invention, the moving direction of the sphere can be maintained in a constant direction, and at the same time, a large amount of fuel can be stably circulated through the auxiliary fuel passage without causing turbulent flow. Therefore, a stable amount of fuel can be discharged according to the position of the armature, which can contribute to stabilization of the pressure-flow rate characteristic.

[Brief description of drawings]

FIG. 1 is an enlarged partial sectional view taken along line II of FIG. 2 showing a fuel pressure control valve device according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing the fuel pressure control valve device, and FIG. The drawings are enlarged partial cross-sectional views for explaining the operation, FIG. 4 and FIG.
FIG. 6 is an enlarged partial sectional view and a partially cut enlarged enlarged partial perspective view showing a modified example of the auxiliary fuel passage, and FIG. 6 is a main portion sectional view showing a conventional example. 20: Pressure regulator (fuel pressure control valve device), 21: Fuel chamber, 22: Pressure chamber, 23: Case, 24
… Fuel inlet, 25… Fuel outlet, 26, 27, 29… Pipe, 28… Pressure inlet, 30… Armature, 31…
Diaphragm, 32, 44 ... Spring, 33 ... Pole,
34 …… Sphere guide fuel passage, 35 …… Valve seat, 36, 37 ……
Fuel discharge passage, 38 ... Sphere, 39, 39A ... Vertical groove (auxiliary fuel passage), 39B ... Spiral groove (auxiliary fuel passage), 4
0 …… Step, 41 …… Spring.

Claims (3)

(57) [Scope of utility model registration request] 1. A case comprising a fuel chamber and a pressure chamber, a fuel introduction port and a fuel discharge port opened on the fuel chamber side of the case, and a pressure introduction port opened on the pressure chamber side of the case. , A diaphragm stretched between the fuel chamber and the pressure chamber so as to divide the case into two chambers, an armature supported by the diaphragm and inserted into the fuel chamber, and an armature attached to the fuel chamber side. A biasing spring member, a pole at the fuel outlet of the case so as to form a fuel passage for guiding the fuel in the fuel chamber to the fuel outlet, and a pole disposed between the pole and the armature to move the armature. In the fuel pressure control valve device, which further comprises a sphere that opens and closes the fuel passage of the pole, the fuel passage of the pole (33) is larger than the diameter of the sphere (38) so that the sphere (38) can slide. Slightly Fuel passage spheres guides that are listening opened (34)
And a valve seat (35) formed to have a smaller diameter than the sphere guide fuel passage (34) and to prevent fuel from flowing out by contact with the sphere (38). )
And a fuel discharge fuel passage (36, 37) opened to guide the fuel from the valve seat (35) to the fuel discharge port (25) of the case (23), and a spherical guide fuel passage (34 ), An auxiliary fuel passage is provided penetrating the wall surface of the sphere, and a sphere (38) is slidably inserted in the sphere guide fuel passage (34) for discharging the fuel. Fuel passage (3
6, 37) is provided with an elastic member (41) that gives the sphere (38) an urging force for constantly contacting the sphere (38) with the armature (30), and the auxiliary fuel passage is A fuel pressure control characterized in that an extension line of the flow path is displaced from the center of the spherical guide fuel passage (34) so that a swirling flow is generated by the fuel flowing through the auxiliary fuel passage. Valve device. 2. An auxiliary fuel passage is constituted by vertical grooves (39, 39A) cut at the opening end of the pole (33),
The fuel pressure control valve device according to claim 1, wherein the vertical groove (39, 39A) is formed so that an extension line in the radial direction is displaced from the center. 3. The utility model registration claim 1 in which the auxiliary fuel passage is constituted by a vertical spiral groove (39B) cut on the inner peripheral surface of the pole (33). Fuel pressure control valve device.