JPH07279792A - Solenoid valve device - Google Patents

Abstract

PURPOSE:To prevent the occurrence of the bounce of a valve body by liquidtightly partitioning a space part where an armature part moves in a body into two fuel chambers through the armature part, and just before the valve body abuts against the body during the valve closing motion of the valve body, making impulsive force act to the valve opening movement of the valve body. CONSTITUTION:When an electric current is applied to a solenoid 2, electromagnetic force is generated, and an armature part 44 is attracted downward by magnetic force, and a needle valve 4 is therefore lowered against a spring 3 and seated on a valve seat 43. In this case, a damper chamber (the first fuel chamber) 8 under the armature part 44 is reduced in its volume and pressurized, and the fuel in the damper chamber 8 leakingly flows through a fuel relief face 47 and groove 48 into an armature part (the second fuel chamber) 10. But when the impulse face 49 of the upper part of the armature begins to lie on the upper face 17 of a body, the fuel relief groove 48 is closed by an armature guide face 16 to restrict the leaking flow of the fuel for making impulsive force act to the valve opening movement of the valve 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve device, and more particularly to a solenoid valve device suitable for use as a solenoid spill valve for controlling fuel in a fuel supply passage of a diesel engine.

[0002]

2. Description of the Related Art Conventionally, an electromagnetic spill valve for controlling fuel flow in a fuel supply passage of a diesel engine has been known. For example, Japanese Unexamined Patent Publication No. 60-128941 discloses a fuel injection pump configured by using such an electromagnetic spill valve.

The fuel injection pump described in the above publication is configured to inject fuel into each cylinder of a diesel engine at an appropriate timing. A high pressure pump whose main part is a plunger that slides in a chamber with a predetermined stroke, and an electromagnetic spill valve that connects or disconnects the pressure chamber and the low pressure chamber.

In this case, the plunger is configured to make a stroke in the pressurizing chamber as the engine rotates.
The pressurizing chamber communicates with a fuel injection nozzle provided in each cylinder of the engine. Therefore, assuming that the electromagnetic spill valve is closed, when the plunger strokes to reduce the volume of the pressurizing chamber, the fuel in the pressurizing chamber is boosted and supplied to the fuel injection nozzle for fuel injection. Will be seen.

On the other hand, when the electromagnetic spill valve is open, the pressure chamber communicates with the low pressure chamber through the electromagnetic spill valve even if the plunger strokes and the volume of the pressure chamber changes accordingly. Therefore, the internal pressure is not increased. Therefore, in this case, high-pressure fuel is not supplied to the fuel injection nozzle, and fuel injection is not executed.

That is, when the electromagnetic spill valve is used, it becomes possible to control the fuel injection timing independently of the operating cycle of the plunger which constitutes the high-pressure pump, and to realize highly accurate fuel injection timing control in the diesel engine. can do.

In this case, as the structure of such an electromagnetic spill valve, a spill passage consisting of a fuel inlet passage opening to the pressurizing chamber and a fuel outlet passage opening to the low pressure chamber is connected or cut off by a needle valve. A structure in which a valve spring for urging the needle valve in the valve opening direction and an electromagnetic solenoid for generating a reaction force against the valve spring are provided has been generally used.

[0008]

As described above, the electromagnetic spill valve is used to control the fuel injection timing, and therefore high responsiveness is required. As one of the methods for improving the responsiveness, it can be considered to increase the initial drive current to the solenoid of the electromagnetic spill valve.

However, when the initial drive current to the solenoid of the electromagnetic spill valve is increased, the armature portion of the needle valve collides strongly with the body when the electromagnetic spill valve is closed,
Further, the needle portion of the needle valve strongly collides with the body seat portion (valve seat portion) of the body, causing bounce.
Here, bounce refers to a phenomenon in which the needle valve repeats opening and closing due to the reverse displacement or vibration of the needle valve due to the reaction of the collision.

If bounce occurs when the electromagnetic spill valve is driven to close, the fuel injection pressure is reduced due to pressure leakage, or the injection amount fluctuates, making it impossible to control the fuel injection amount appropriately. There is a problem that it ends up.

The present invention has been made in view of the above points, and when the valve body closes, a buffering force acts on the valve closing movement of the valve body immediately before the valve body contacts the body. It is an object of the present invention to provide a solenoid valve device having a structure in which bounce is prevented from occurring.

[0012]

[Means for Solving the Problems] The above problems can be solved by taking the following measures.

According to the first aspect of the present invention, a spill passage including an inlet passage and an outlet passage formed in the body, a solenoid disposed in the body for generating an electromagnetic force, and the spill passage are opened and closed. In a solenoid valve device comprising a needle and a valve body having an armature portion for displacing the needle portion by applying an electromagnetic force of the solenoid, a space in which the armature portion is displaced in the body is defined by an armature. Is configured to liquid-tightly define the first fuel chamber and the second fuel chamber by means of a portion, and at the time of the valve closing operation of the valve body, until the armature portion descends to a predetermined lowering position, The first fuel chamber and the second fuel chamber are communicated with each other to allow the fuel in the first fuel chamber to escape to the second fuel chamber,
An escape passage configured to prevent the fuel in the first fuel chamber from escaping to the second fuel chamber when the armature portion is closed when the armature portion descends from the predetermined lower position, and at the time of valve opening operation of the valve element. And a supply passage that connects the second fuel chamber and the first fuel chamber and that is provided with a valve mechanism that allows only fuel supply from the second fuel chamber to the first fuel chamber. It is characterized by that.

According to a second aspect of the invention, in the solenoid valve device according to the first aspect, the relief passage is provided between an outer peripheral surface formed on the armature portion and an inner peripheral surface of an armature guide formed on the body. The armature guide outer peripheral surface is tapered toward the lower end, and a step portion is formed on the inner peripheral surface of the armature of the body. It is a feature.

According to the third aspect of the invention, a spill passage formed in the body, the spill passage having an inlet passage and an outlet passage,
A valve body including a solenoid that is disposed in the body and generates an electromagnetic force, a needle portion that opens and closes the spill passage, and an armature portion that displaces the needle portion when the electromagnetic force of the solenoid is applied. And a structure in which a space portion in which the armature portion is displaced in the body is liquid-tightly defined by the armature portion into a first fuel chamber and a second fuel chamber. A first fuel chamber formed in the lower part of the armature part and the spill passage communicate with each other, and a supply passage serving as a passage for supplying fuel from the spill passage to the first fuel chamber, the first fuel chamber and the first fuel chamber A communication passage that communicates the two fuel chambers, and a one-way orifice that is disposed in the communication passage and that changes the flow rate of the fuel between the first fuel chamber and the second fuel chamber according to the fuel flow direction. The is characterized in that provided.

Further, according to the invention of claim 4, a spill passage having an inlet passage and an outlet passage formed in the body,
A valve body including a solenoid that is disposed in the body and generates an electromagnetic force, a needle portion that opens and closes the spill passage, and an armature portion that displaces the needle portion when the electromagnetic force of the solenoid is applied. And a structure in which the space portion in which the armature portion is displaced in the body is liquid-tightly defined by the armature portion into the first fuel chamber and the second fuel chamber, and A first fuel chamber formed in the lower part of the portion and a spill passage, and a supply passage serving as a passage for supplying fuel from the spill passage to the first fuel chamber; the first fuel chamber and the second fuel chamber; A communication passage communicating with the fuel chamber and the valve closing operation of the valve body,
The communication path is opened to allow the fuel in the first fuel chamber to escape to the second fuel chamber and the armature portion is lowered from the predetermined lowered position until the armature portion is lowered to the predetermined lowered position. To prevent the fuel in the first fuel chamber from escaping to the second fuel chamber, and to open the communication passage during the valve opening operation of the valve element to prevent the fuel from flowing into the second fuel chamber.
And a communication passage opening / closing mechanism that allows fuel to be supplied from the fuel chamber to the first fuel chamber.

Further, according to the invention of claim 5, a spill passage which is formed in the body and has an inlet passage and an outlet passage,
A valve body comprising a solenoid disposed in the body for generating an electromagnetic force, a needle portion for opening and closing the spill passage, and an armature portion for displacing the needle portion by applying the electromagnetic force of the solenoid. In the electromagnetic valve device having the above-mentioned, when a closing operation of the valve body is provided, a cushioning mechanism for urging a force in a direction that hinders the lowering operation of the valve body when the valve body descends to a predetermined lowering position is provided. It is a feature.

[0018]

The above-mentioned means operate as follows.

According to the first aspect of the invention, when the valve body is closed, the armature portion causes the first fuel chamber and the second fuel chamber to be closed.
Since it is configured to be liquid-tight with the fuel chamber of
Although the volume of the first fuel chamber decreases due to the downward movement of the armature portion, the fuel in the first fuel chamber passes through the escape passage until the armature portion descends to the predetermined lowering position, and the fuel in the first fuel chamber becomes the second fuel chamber. Therefore, the valve closing operation of the valve body is performed with good responsiveness.

Further, when the armature portion is lowered from the predetermined lowering position, the escape passage is filled with the second fuel in the first fuel chamber.
The fuel flow resistance of the fuel increases because the first fuel chamber and the second fuel chamber are liquid-tightly defined by the armature portion. Therefore, a force (that is, a damper action) that prevents the lowering operation of the armature portion is generated in the first fuel chamber, and it is possible to prevent the valve body from abutting strongly on the body. As a result, it is possible to prevent bounce between the valve body and the body, prevent the fuel injection pressure from decreasing due to pressure leakage, and prevent the fuel injection amount from fluctuating. It becomes possible to carry out.

On the other hand, when the valve body is opened, the volume of the second fuel chamber is smaller than when the valve is closed.
Since the fuel in the fuel chamber flows into the first fuel chamber through the supply passage, the valve opening operation of the valve body is performed with good responsiveness. Further, since the supply passage is provided with the valve mechanism that allows only the fuel supply from the second fuel chamber to the first fuel chamber, the valve mechanism is passed through the supply passage from the first fuel chamber during the valve closing operation. No fuel flows into the second fuel chamber. Therefore, during the valve closing operation, the damper action does not deteriorate due to the supply passage. Therefore, according to the first aspect of the present invention, it is possible to reliably prevent the occurrence of bounce while maintaining high responsiveness of the solenoid valve device.

According to the invention of claim 2, claim 1
In the electromagnetic valve device described above, the escape passage is formed by a gap formed between an outer peripheral surface formed on the armature and an inner peripheral surface of an armature guide formed on the body, and
The outer peripheral surface of the armature guide is tapered toward the lower end and a step portion is formed on the inner peripheral surface of the armature of the body to project inward. The size of the gap formed between the inner peripheral surface and the inner peripheral surface changes, so that the fluid resistance of the relief passage can be made variable by the displacement of the valve body.

The fluid resistance of the relief passage acts as a damper that prevents the valve body from closing, and the outer peripheral surface of the armature guide is tapered toward the lower end. As it moves, the cross-sectional area of the gap decreases and the damper action increases. As a result, the damper action increases as the valve body closes, and it is possible to prevent the valve body from coming into strong contact with the body, and to prevent bounce between the valve body and the body. it can.

Further, according to the invention of claim 3, the flow rate of the fuel between the first fuel chamber and the second fuel chamber is provided in the communication passage which communicates the first fuel chamber and the second fuel chamber. By providing a one-way orifice that can be changed depending on the fuel flow direction, it is possible to add a damper action to the downward moving valve element with a simple structure, and increase the fuel flow rate when the valve element is opened. By setting it, it is possible to improve the responsiveness when the valve is opened.

According to the fourth aspect of the present invention, a communication passage that connects the first fuel chamber and the second fuel chamber is provided, and the armature portion descends to a predetermined lower position when the valve body closes. During the period, the communication passage opening / closing mechanism opens the communication passage to allow the fuel in the first fuel chamber to escape to the second fuel chamber, so that the fuel in the first fuel chamber can be discharged through the communication passage. Since it flows into the second fuel chamber, the valve closing operation of the valve body can be performed with good responsiveness.

Further, when the armature portion is lowered from the predetermined lowered position, the communication passage opening / closing mechanism closes the communication passage to prevent fuel from flowing from the first fuel chamber to the second fuel chamber. In addition, since the first fuel chamber and the second fuel chamber are liquid-tightly defined by the armature portion, the fuel flow resistance increases. Therefore, a damper action that prevents the lowering operation of the armature portion is generated in the first fuel chamber, and thus it is possible to prevent bounce between the valve body and the body, and to prevent fuel leakage due to pressure leakage. It is possible to prevent the injection pressure from decreasing and the injection amount from varying.

Further, when the valve body is opened, the volume of the second fuel chamber is reduced unlike when the valve is closed. During this operation, the communication passage opening / closing mechanism opens the communication passage to open the second fuel. To allow fuel supply from the chamber to the first fuel chamber,
The valve opening response of the valve body can be improved.

Further, according to the invention of claim 5, at the time of the valve closing operation of the valve body, when the valve body is lowered to a predetermined lowering position, a buffer mechanism for urging a force in a direction to hinder the lowering operation of the valve body. By providing the valve body, it is possible to prevent the valve body from coming into strong contact with the body, and thus to prevent bounce between the valve body and the body. It is possible to prevent a decrease in pressure and a change in the injection amount, and to perform an appropriate fuel injection amount control.

[0029]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 shows a solenoid valve device according to a first embodiment of the present invention. The solenoid valve device according to the present embodiment corresponds to claim 1. Further, the electromagnetic valve device shown in the figure is incorporated in a fuel injection pump of a diesel engine as an electromagnetic spill valve (hereinafter, this electromagnetic valve device is referred to as an electromagnetic spill valve).

The electromagnetic spill valve is roughly composed of a body 1, a solenoid 2, a valve spring 3, a needle valve 4 and the like.

The body 1 accommodates the respective constituent members of the electromagnetic spill valve 1 with the cap 9 screwed onto the upper portion (reference numeral 91 indicates a threaded portion), and the fuel inlet passage 11 and the fuel outlet are provided. Spill passage 20 consisting of passage 13
Are formed. The fuel inlet passage 11 is open to the left side surface of the body 1 in the figure, and the fuel outlet passage 13 is open to the right side surface of the body 1 in the figure.

The spill passage 20 has a fuel inlet passage 11 and a fuel outlet passage 1 at a central lower portion of the body 1.
3 and the body sheet surface 12 is formed in the communicating portion. The body seat surface 12 is a portion that functions as a valve seat of the needle valve 4.

A needle guide surface 14 (having a cylindrical shape) for guiding the movement of the needle valve 4 is formed in the center of the body 1 by slidingly contacting a needle valve 4 which will be described later. At the same time, a body end surface 15 and a body upper surface 17 are formed at an upper surface position facing the cap 9, and an upright armature guide surface 16 is formed at a boundary position between the body end surface 15 and the body upper surface 17. . Further, in the upper right part of the body 1 in the figure, the fuel intake passage 1
8 is formed.

As shown in the drawing, the fuel intake passage 18 has a substantially L-shape when viewed in cross section, and the lower end portion is open to the lower end portion of the armature guide surface 16.
Further, the upper end portion is configured to open to the body upper surface 17. Further, the ball spring 5,
A check ball 6 and an orifice 7 are provided. The ball spring 5, the check ball 6, and the orifice 7 cooperate with each other to form a check valve mechanism, and the fuel flows through the fuel intake passage 18 only from the top to the bottom in the drawing.

The solenoid 2 is internally provided at a predetermined position of the body 1 and is configured to be excited when a current is applied. The solenoid 2 is a computer (hereinafter referred to as ECU) that performs a fuel injection control process (not shown).
The energization is controlled by. When the solenoid 2 is energized by the ECU, the needle valve 4 described below moves downward to close the spill passage 20 and the fuel is pumped from the fuel pump to the diesel engine. Further, when the energization of the solenoid 2 is stopped, the needle valve 4 moves upward to open the spill passage 20, whereby the fuel is spilled (overflowed) and the pressure feeding of the fuel to the diesel engine is stopped. Has been done.

The needle valve 4 which constitutes the valve body has a generally cylindrical needle portion 41 and a disc-shaped armature portion 4.
4 and 4 are integrally formed. The needle portion 41 is attached to the body 1 such that the sliding surface 42 formed on the outer periphery thereof is in sliding contact with the needle guide surface 14 formed on the body 1. Further, the armature part 44 is attached to the body 1 such that the sliding surface 46 formed on the outer periphery of the armature part 44 is in sliding contact with the armature guide surface 16 formed on the body 1. The needle valve 4 is attached to the body 1 as described above. In this attached state, the armature portion 4 is attached.
The sliding surface 46 formed on the outer periphery of the armature 4 and the armature guide surface 16 are configured to be in liquid-tight contact with each other.

As shown in FIG. 1, a space 22 is formed between the upper surface of the body 1 and the cap 9 for the armature part 44 to move. In this space 22, the armature part 44 is the armature part. Liquid-tightly contacting the guide surface 16 defines the two chambers in a liquid-tight manner. In the following description, of the two chambers of the space portion 22 defined by the armature portion 44, the room located below the armature portion 44 is referred to as the damper chamber 8 (first fuel chamber), and also the armature portion 44. The room located above is referred to as the armature room 10 (second fuel room).

To define the damper chamber 8 and the armature chamber 10 more accurately, the damper chamber 8 has a sliding surface 42 of the needle portion 41, a lower surface 45 of the armature portion 44, a body end surface 15, and an armature guide surface 16. It consists of a part surrounded by and. The armature chamber 10 is composed of a portion surrounded by the cap 9 and the upper surface 50 of the armature portion 44.

A valve seat surface 43 is formed at the lower end of the needle portion 41, and the valve seat surface 43 is formed.
Is in a liquid-tight contact with the body seat surface 12 formed on the body 1 in the valve closed state, whereby the spill passage 20 is closed.

Further, the armature portion 44 is provided with a fuel escape surface 47 and a fuel escape groove 48 which form an escape passage. The fuel escape surface 47 is a chamfered portion (concave portion) formed in the armature portion 44 so as to extend in the vertical direction. Further, the fuel escape groove 48 is a groove portion formed in the armature portion 44 in an annular shape, and the fuel escape groove 48 and the fuel escape surface 47 communicate with each other. Therefore,
When the needle valve 4 moves up and down, the fuel relief groove 4
When 8 is higher than the upper surface 17 of the body, the damper chamber 8 and the armature chamber 10 are configured to communicate with each other via the fuel escape surface 47 and the fuel escape groove 48, and the fuel is transferred from the damper chamber 8 to the armature chamber 10. It functions as an escape passage.

A valve spring 3 is connected to the lower end of the needle valve 4, and the valve spring 3 is configured to constantly elastically bias the needle valve 4 upward. Therefore, when the solenoid 2 is not energized, the needle valve 4 is in the upper moving position elastically biased by the valve spring 3, and the solenoid 2
When the solenoid is energized, the armature portion 44 is attracted by the magnetic force generated in the solenoid 2 and the needle valve 4 moves downward against the elastic force of the valve spring 3.

Next, the operation of the electromagnetic spill valve having the above structure will be described with reference to FIGS.

FIG. 2 shows the electromagnetic spill valve in a state where the solenoid 2 is not energized (that is, the spill state). When the solenoid 2 is not energized, the needle valve 4 is in a position where it is elastically urged by the valve spring 3 to move upward, and the spill passage 20 is open. Therefore, the fuel flowing from the fuel inlet passage 11 (in the figure, the portion showing the fuel is hatched) flows to the fuel outlet passage 13 through between the body seat surface 12 and the valve seat surface 43, Therefore, the fuel is spilled.

FIG. 3 shows a state in which the needle valve 4 energized by the solenoid 2 is moving downward. When an electric current is passed through the solenoid 2, an electromagnetic force is generated, and the armature portion 44 (formed of a magnetic material) arranged above the needle valve 4 is attracted downward by the magnetic force, so that the needle valve 4 becomes a valve spring. It descends against the elastic force of 3.

As the needle valve 4 descends, the volume of the damper chamber 8 formed in the lower portion of the armature portion 44 becomes smaller, so that the fuel in the damper chamber 8 that has been pressurized passes through the fuel escape surface 47. Flows into the fuel escape groove 48,
Further, it flows into the armature chamber 10 formed in the upper part of the armature portion 44. As described above, in the state where the fuel escape groove 48 is in communication with the armature chamber 10, the fuel in the damper chamber 8 is still in contact with the fuel escape surface 4 even if the needle valve 4 is lowered.
7. The needle valve 4 descends promptly because it flows into the armature chamber 10 through the fuel escape groove 48, so that the responsiveness of the valve closing operation can be improved.

When the needle valve 4 is sucked further downward than in the state shown in FIG. 3 and the armature upper sliding surface 49 and the body upper surface 17 start to overlap with each other, the fuel escape groove 48 is closed by the armature guide surface 16. The escape path of the fuel in the damper chamber 8 is greatly limited, and the damper action on the needle valve 4 is thereby generated.

Due to the damper action of the damper chamber 8, the downward moving speed of the needle valve 4 decreases, and the valve seat surface 43 formed at the lower end of the needle valve gently contacts the body seat surface 12. In this way, by configuring the damper chamber 8 to have a damper action, it is possible to prevent the needle valve 4 from abutting strongly on the body 1, and bounce occurs between the needle valve 4 and the body 1. It can be surely prevented. Therefore, it is possible to prevent the decrease of the fuel injection pressure and the change of the injection amount due to the pressure leakage, and it is possible to appropriately control the fuel injection amount.

FIG. 4 shows a state where the electromagnetic spill valve is closed. In this state, the valve seat surface 43 contacts the body seat surface 12 to close the spill passage 20. Therefore, the fuel flowing from the fuel inlet passage 11 is shut off by the needle valve 4, so that the high-pressure fuel is pressure-fed to the diesel engine and the fuel injection is performed.

On the other hand, to stop the fuel injection, the power supply to the solenoid 2 is stopped. When the energization of the solenoid 2 is stopped, the electromagnetic force disappears, and the needle valve 4 is pushed upward by the valve spring. Then, the valve seat surface 43 separates from the body seat surface 12, the spill passage 20 is opened, and the fuel again flows from the fuel inlet passage 11 toward the fuel outlet passage 13 and is spilled.

Unlike the time when the needle valve 4 is opened, the volume of the armature chamber 10 is small when the needle valve 4 is opened, but the fuel in the armature chamber 10 is filled with fuel.
8 into the damper chamber 8 through the armature chamber 10
The fuel in the chamber does not hinder the opening operation of the needle valve 4, and thus the opening operation of the needle valve 4 is controlled by EC.
It can be performed with high responsiveness in response to the signal from U.
Further, in the fuel intake passage 18, the ball springs 5,
A check valve mechanism including a check ball 6, an orifice 7 (in which an orifice hole 71 is formed), and the like is provided, and the check valve mechanism allows fuel to flow through the fuel intake passage 18 from the top to the bottom in the drawing. In other words, the fuel flows only in the direction from the armature chamber 10 to the damper chamber 8. Therefore, fuel does not flow from the damper chamber 8 into the armature chamber 10 through the fuel intake passage 18 during the valve closing operation described above. Therefore, the damper action is caused by the existence of the fuel intake passage 18 during the valve closing operation. Does not decrease.

FIG. 6A is a diagram showing changes in the lift of the needle valve 4 in the electromagnetic spill valve according to this embodiment.
The arrow (a) shown in the figure indicates the state of FIG. 2 described above, similarly, (b) is the state of FIG. 3, (c) is the state of FIG. 4, and (d) is the state of FIG. The respective lift states are shown. As shown in the figure, in the electromagnetic spill valve according to the present embodiment, since the damper action acts on the needle valve 4 immediately before the needle valve 4 is completely closed, the position shown by the arrow P1 in the figure is smooth. It is a curve.

On the other hand, FIG. 6B shows the change in lift of the conventional electromagnetic spill valve. As shown in the figure, since the needle valve does not function as a damper in the related art, when the needle valve comes into contact with the body (that is, in the closed state), the needle valve bounces as indicated by arrow P2 in the figure. Occurs. Due to the occurrence of this bounce, the needle valve repeatedly separates from and abuts on the valve seat surface formed on the body, which causes a decrease in fuel injection pressure due to pressure leakage or changes in the injection amount, resulting in an appropriate fuel injection. The injection amount could not be controlled.

On the other hand, in the electromagnetic spill valve according to the present embodiment, since the needle valve 4 is smoothly seated on the valve seat surface 43 as described above, it is possible to reliably prevent the occurrence of bounce, and therefore the precision is high. The fuel injection amount control can be performed.

In the above-described embodiment, the damper action that occurs when the needle valve 4 closes is the same as the armature upper sliding surface 49 when the valve seat surface 43 and the body seat surface 12 contact each other. It can be adjusted by appropriately selecting an overlapping dimension (shown by an arrow L1 in FIG. 1) with the upper surface 17 of the body. As described above, since the damper action is adjustable, it is possible to give the most suitable damper action to the fuel pressure and the magnetic force of the solenoid 2 (equivalent to the descending speed of the needle valve 4). Therefore, by properly performing this adjustment, bounce prevention and needle valve 4
It is possible to improve both the responsiveness during the opening / closing operation of the.

FIG. 7 shows an electromagnetic valve device (electromagnetic spill valve) according to a second embodiment of the present invention. The electromagnetic spill valve according to the present embodiment corresponds to claim 2. In the figure, the same components as those of the electromagnetic spill valve according to the first embodiment shown in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

In the electromagnetic spill valve according to the first embodiment, when the needle valve 4 performs the closing operation, the fuel escape surface 47 and the fuel escape surface 47 are formed in order to form an escape passage for allowing the fuel to escape from the damper chamber 8 to the armature chamber 10. The structure in which the escape groove 48 is formed is shown. The present embodiment is characterized in that a damper action is exerted by changing the shape of the armature portion 44 in place of the fuel relief surface 47 and the fuel relief groove 48. The specific configuration will be described below.

In this embodiment, the escape passage and the sliding contact surface (outer peripheral surface) 46-1 formed on the armature portion 44 and the body 1 are provided.
It is formed by a gap formed between the armature guide surface (inner peripheral surface) 16-1 formed in the above. The sliding contact surface 46-1 is tapered toward the lower end, and the armature guide surface 16-1 is provided with a step 51 protruding inward. Therefore, the above-mentioned escape passage is accurately constituted by the gap between the sliding contact surface 46-1 and the step 51.

FIG. 8 shows the relationship between the lift amount of the needle valve 4 (indicated by arrow L2 in FIG. 7) and the area of the escape passage (area of the portion indicated by arrow A in FIG. 7). As described above, the shape of the sliding contact surface 46-1 formed on the armature portion 44 is a taper shape that is narrowed toward the lower end. Therefore, as the lift amount L2 increases, in other words, the needle valve 4 moves. As it moves downward, the gap between the sliding contact surface 46-1 and the step portion 51 becomes narrower and the area A of the escape passage becomes smaller.

That is, with the above structure, the area A of the escape passage can be changed with the displacement of the needle valve 4, and the area A of the escape passage has a correlation with the fluid resistance to the fuel flowing through the escape passage. The fluid resistance of the escape passage can be made variable by the displacement of the needle valve 4. The fluid resistance of the relief passage has a damper action that prevents the needle valve 4 from closing, and as is clear from FIG. 8, the cross-sectional area A becomes small and the damper action increases when the needle valve 4 closes. To do.

As described above, the damper action increases as the needle valve 4 performs the valve closing operation, so that when the valve seat surface 43 formed on the needle valve 4 abuts the body seat surface 12, the damper described above is used. Due to the action, the downward moving speed of the needle valve 4 is slowed down. Therefore, even with the configuration of this embodiment, the needle valve 4 can be prevented from coming into strong contact with the body 1, and the bounce between the needle valve 4 and the body 1 can be prevented, as in the first embodiment. The fuel injection amount can be controlled with high accuracy.

In order to realize the structure of the present embodiment, the sliding contact surface 46-1 is simply tapered so as to face the lower end direction, and the armature guide surface 16-1 projects inward. Since it is only necessary to form the stepped portion 51,
Since it is not necessary to form the fuel relief surface 47 and the fuel relief groove 48 having a complicated shape as in the electromagnetic spill valve according to the first embodiment, the body 1 and the needle valve 4 can be easily formed.

9 to 11 show an electromagnetic valve device (electromagnetic spill valve) which is a third embodiment of the present invention. This embodiment corresponds to claim 3. In the figure, the same components as those of the electromagnetic spill valve according to the first embodiment shown in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 9, in the electromagnetic spill valve according to the present embodiment, the fuel relief surface 47 and the fuel relief groove 48 provided in the first embodiment are eliminated, and the damper chamber 8 and the armature chamber are eliminated. A one-way orifice 25 is provided in the fuel suction passage 18 which serves as a communication passage communicating with 10. This one way orifice 25
Are arranged in place of the check balls 6 provided in the first embodiment.

The one-way orifice 25 is shown enlarged in FIGS. 10 and 11 (in each figure, the portion indicated by the arrow A in FIG. 9 is enlarged). As shown in each drawing, the one-way orifice 25 has a through hole 25a formed in the central portion and a fluid passage 25b formed in the outer peripheral portion. The one-way orifice 25 is elastically biased upward by the spring 5. Therefore, armature part 4
When there is no displacement of 4 (when the valve is open and when it is closed) and when the armature part 44 is moving downward (when the valve is closing),
As shown in FIG. 10, the one-way orifice 25 is in contact with the orifice 7.

The one-way orifice 25 is the orifice 7.
The fluid passage 25b formed in the outer peripheral portion is closed in the state where the fluid passage 25b is in contact with. Therefore, when the needle valve 4 closes and the fuel in the damper chamber 8 is pressurized, the fuel in the damper chamber 8 passes through only the through hole 25 a formed in the one-way orifice 25 and enters the armature chamber 10. Inflow.

Since the through hole 25a formed in the one-way orifice 25 is a small-diameter hole having a predetermined diameter, the fluid resistance is large, and therefore the damper chamber 8 to the armature chamber 1
The damper action occurs when the fuel flows into zero. Due to this damper action, it is possible to reliably prevent the occurrence of bounce between the needle valve 4 and the body 1, and thus it is possible to prevent a decrease in the fuel injection pressure and a change in the injection amount due to a pressure leak. It is possible to carry out an appropriate fuel injection amount control.

On the other hand, when the needle valve 4 is opened, the armature chamber 10 is pressurized, so that the fuel flows from the armature chamber 10 toward the damper chamber 8. The one-way orifice 25 is biased by the fuel flowing from the armature chamber 10 toward the damper chamber 8 and is downwardly displaced against the elastic force of the spring 5 as shown in FIG. As a result, the one-way orifice 25 is separated from the orifice 7, and the fluid passage 25b is opened. Therefore, the area of the passage of the one-way orifice 25 through which the fuel can pass is widened, and a larger amount of fuel can be flowed than when the needle valve 4 performs the valve closing operation. Thus, since the one-way orifice 25 can flow a large flow rate of fuel when the needle valve 4 performs the valve opening operation, the needle valve 4 can perform the valve opening operation with high responsiveness.

As described above, by disposing the one-way orifice 25 in the fuel intake passage 18 which connects the damper chamber 8 and the armature chamber 10, a damper action is exerted on the downwardly moving needle valve 4 with a simple structure. Further, when the needle valve 4 is opened, a large flow rate of the fuel is set to improve the responsiveness when the valve is opened.

FIG. 12 shows an electromagnetic valve device (electromagnetic spill valve) according to a fourth embodiment of the present invention. This embodiment corresponds to claim 4. In the figure, the same components as those of the electromagnetic spill valve according to the first embodiment shown in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

In the electromagnetic spill valve according to this embodiment, the fuel escape surface 4 of the armature portion 44 provided in the first embodiment is used.
7, the fuel escape groove 48 and the ball spring 5, the check ball 6, and the orifice 7 provided in the fuel intake passage 18 are eliminated, and instead, a hydraulic damper adjusting valve 19 that functions as a communication passage opening / closing mechanism and its drive circuit ( EDU
2) 102 is provided. Further, in the present embodiment, the fuel intake passage 18 functions as a communication passage that connects the damper chamber 8 and the armature chamber 10. The detailed configuration will be described below.

In FIG. 12, reference numeral 100 is a computer (ECU) for performing the above-described fuel injection control processing, and in this embodiment, the drive control of the hydraulic damper adjusting valve 19 is also performed by the ECU 100.
It is configured to be performed by. Further, this ECU 100
Is also connected to the solenoid 2 via a drive circuit (EDU1) 101, and is also configured to control the drive of the solenoid 2. Further, in the hydraulic damper adjusting valve 19, the needle valve 19b is displaced by energizing the solenoid 19a provided therein, whereby the fuel suction passage 18 is opened and closed. That is, by the operation of the hydraulic damper adjusting valve 19, the damper chamber 8 and the armature chamber 10 are communicated with each other or the communication is stopped.

Next, the operation of the electromagnetic spill valve having the above structure will be described with reference to the timing chart shown in FIG. 13 in addition to FIG.

From the ECU 100 to the drive circuit (EDU1) 1
When the drive signal S1 is transmitted to 01, the drive circuit (EDU
1) An electric current flows from 101 to the solenoid 2, whereby an electromagnetic force is generated in the solenoid 2 and the needle valve 4 is sucked downward to start the valve closing operation. At this time, the ECU 10
A control signal is sent from 0 to the hydraulic damper adjusting valve 19 via the drive circuit (EDU2) 102 so as to open.
Therefore, since the hydraulic damper adjusting valve 19 is opened when the needle valve 4 has started the valve closing operation, the fuel in the damper chamber 8 flows into the armature chamber 10 through the fuel suction passage 18. . Therefore, the closing operation of the needle valve 4 is performed with good responsiveness.

After that, when the time t1 elapses and the armature portion 44 of the needle valve 4 descends to a predetermined position, the ECU 1
00 transmits the drive signal S2 to the drive circuit (EDU2) 102. When the drive signal S2 is transmitted to the drive circuit (EDU2) 102, a current flows from the drive circuit (EDU2) 102 to the hydraulic damper adjustment valve 19, which causes the hydraulic damper adjustment valve 19 to close the fuel intake passage 18.

By closing the fuel suction passage 18, a damper action is generated in the damper chamber 8. Due to this damper action, the needle valve 4 is gently closed, and it is possible to reliably prevent bounce between the needle valve 4 and the body 1. Therefore, it is possible to prevent the decrease of the fuel injection pressure and the change of the injection amount due to the pressure leakage, and it is possible to appropriately control the fuel injection amount.

When time t2 has elapsed after the drive signal S2 was transmitted to the drive circuit (EDU2) 102, the ECU
The reference numeral 100 stops the transmission of the drive signal S2 transmitted to the drive circuit (EDU2) 102. As a result, the current flowing from the drive circuit (EDU2) 102 to the hydraulic damper adjusting valve 19 is stopped, and the hydraulic damper adjusting valve 19 opens the fuel intake passage 18 again. Therefore, when the needle valve 4 is opened, the fuel suction passage 18 is in a state in which the damper chamber 8 and the armature chamber 10 are in communication with each other, so that the fuel does not flow from the armature chamber 10 into the damper chamber 8. The needle valve 4 is opened satisfactorily, and thus the opening operation of the needle valve 4 is performed with good response.

FIG. 14 shows an electromagnetic valve device (electromagnetic spill valve) which is a fifth embodiment of the present invention. This embodiment corresponds to claim 5. In the figure, the same components as those of the electromagnetic spill valve according to the first embodiment shown in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

In the electromagnetic spill valve according to this embodiment, the fuel escape surface 4 of the armature portion 44 provided in the first embodiment is used.
7, the fuel escape groove 48, the fuel suction passage 18, the ball spring 5, the check ball 6, and the orifice 7 are abolished,
Instead, a damper spring 30 that functions as a buffer mechanism is provided. Further, in the present embodiment, the armature portion 44 of the needle valve 4 does not liquid-tightly define the damper chamber 8 and the armature chamber 10,
The armature guide surface 16 and the sliding surface 46 are separated from each other, and this separated portion functions as a communication passage that connects the damper chamber 8 and the armature chamber 10.

Next, the operation of the electromagnetic spill valve configured as described above will be described with reference to FIG. 15 in addition to FIG.
15 is a needle valve 4 of the electromagnetic spill valve shown in FIG.
It is a figure which shows the lift characteristic of.

The solenoid 2 is energized and the needle valve 4
When the valve closing operation is started, since there is a separation distance (indicated by L3 in the figure) between the upper end of the damper spring 30 and the armature portion 44 of the needle valve 4, the armature portion 44 is formed. The dump spring 30 does not affect the needle valve 4 until it moves a distance L3. Therefore, the needle valve 4 performs the valve closing operation at a speed determined by the electromagnetic force of the solenoid 2 and the elastic force of the valve spring 3, so that the valve closing operation is performed with good responsiveness.

After that, when the needle valve 4 moves the distance L3, the armature portion 44 comes into contact with the dump spring 30 and receives the elastic force of the dump spring 30. The elastic force of the dump spring 30 acts as a force that hinders the downward movement of the needle valve 4, so that the dump spring 30 exerts a damper action on the needle valve 4.

As described above, since the dump spring 30 causes the damper action, it is possible to prevent the needle valve 4 from abutting strongly on the body 1, and a bounce occurs between the needle valve 4 and the body 1. It can be surely prevented. Therefore, according to the present embodiment as well, it is possible to prevent the decrease of the fuel injection pressure and the change of the injection amount due to the pressure leakage, and it is possible to perform the appropriate fuel injection amount control.

When the solenoid 2 is de-energized and the valve opening operation is started, the needle valve 4 is biased upward by the elastic force of the dump spring 30 in addition to the elastic force of the valve spring 3. Since the upward movement is performed promptly, the valve opening response can be improved.

FIG. 16 shows an electromagnetic valve device (electromagnetic spill valve) according to a sixth embodiment of the present invention. This embodiment also corresponds to claim 5. In the figure, the same components as those of the electromagnetic spill valve according to the first embodiment shown in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

In the electromagnetic spill valve according to this embodiment, the fuel escape surface 4 of the armature portion 44 provided in the first embodiment is used.
7, the fuel escape groove 48, the fuel suction passage 18, the ball spring 5, the check ball 6, and the orifice 7 are abolished,
Instead, a pair of magnets 31, which function as a buffer mechanism,
32 is provided. Of this pair of magnets 31, 32, one magnet 31 is arranged at the lower end of the needle valve 4, and the other magnet 32 is arranged in the body 1. The arrangement position is selected so as to face the moving direction of the needle portion 41. Further, the pair of magnets 31 and 32 are arranged so that the same magnetic poles face each other.

Also in this embodiment, the armature portion 44 of the needle valve 4 does not liquid-tightly define the damper chamber 8 and the armature chamber 10, and the armature guide surface 16 and the sliding surface 46 are separated from each other. This separated portion functions as a communication passage that connects the damper chamber 8 and the armature chamber 10.

Next, the operation of the electromagnetic spill valve having the above structure will be described.

The solenoid 2 is energized and the needle valve 4
When the valve closing operation is started, immediately after the valve closing operation is started, the needle valve 4 is in the upwardly moved position and the magnets 31 and 32 are separated from each other. Therefore, even if the same magnetic poles are arranged to face each other, No repulsive force is generated between the magnets 31 and 32, so that the needle valve 4 closes at a speed determined by the electromagnetic force of the solenoid 2 and the elastic force of the valve spring 3. Therefore, the needle valve 4 closes the valve with good response.

After that, the needle valve 4 is moved to the magnets 31, 32.
Move to a position where their magnetic forces affect each other, the needle valve 4 is affected by the repulsive force generated between the magnets 31 and 32. The repulsive force generated between the magnets 31 and 32 acts as a force that hinders the downward movement of the needle valve 4, so that the magnets 31 and 32 exert a damper action on the needle valve 4.

As described above, since the pair of magnets 31 and 32 generate the damper action, it is possible to prevent the needle valve 4 from coming into strong contact with the body 1, and between the needle valve 4 and the body 1. Bounce can be reliably prevented. Therefore, according to the present embodiment as well, it is possible to prevent the decrease of the fuel injection pressure and the change of the injection amount due to the pressure leakage, and it is possible to perform the appropriate fuel injection amount control.

When the solenoid 2 is de-energized and the valve opening operation is started, the needle valve 4 is upwardly biased by the repulsive force between the magnets 31 and 32 in addition to the elastic force of the valve spring 3. Therefore, the valve opening responsiveness can be improved because the upward movement is promptly performed.

[0093]

As described above, according to the present invention, the following various effects are exhibited.

According to the first aspect of the invention, the fuel in the first fuel chamber flows into the second fuel chamber through the escape passage until the armature portion descends to the predetermined lowering position. The valve closing operation can be performed with good responsiveness.

Further, when the armature portion is lowered from the predetermined lowering position, a force (that is, a damper action) that prevents the lowering operation of the armature portion is generated in the first fuel chamber, and the valve body strongly abuts the body. This can be prevented, and thus bounce can be prevented from occurring between the valve body and the body. Therefore, it is possible to prevent a decrease in the fuel injection pressure and a change in the injection amount due to a pressure leak,
It is possible to carry out an appropriate fuel injection amount control.

According to the second aspect of the present invention, the size of the gap formed between the outer peripheral surface and the inner peripheral surface of the armature guide changes with the displacement of the valve body, so that the displacement of the valve body The fluid resistance of the escape passage, that is, the damper force can be made variable. Further, since the cross-sectional area of the gap becomes smaller as the valve body moves downward, the damper action increases as the valve body performs the valve closing operation, and the valve body is prevented from coming into strong contact with the body. It is possible to prevent the occurrence of bounce between the valve body and the body.

According to the third aspect of the invention, the flow rate of the fuel between the first fuel chamber and the second fuel chamber is provided in the communication passage that connects the first fuel chamber and the second fuel chamber. By providing a one-way orifice that can be changed depending on the fuel flow direction, it is possible to add a damper action to the downward moving valve element with a simple structure, and increase the fuel flow rate when the valve element is opened. By setting it, it is possible to improve the responsiveness when the valve is opened.

Further, according to the invention of claim 4, the fuel in the first fuel chamber flows into the second fuel chamber through the communication passage until the armature portion descends to the predetermined lowering position. The valve closing operation of the valve body can be performed with good responsiveness.

Further, when the armature portion is lowered from the predetermined lowering position, a damper action for preventing the lowering operation of the armature portion occurs in the first fuel chamber, which causes a gap between the valve body and the body. It is possible to prevent the occurrence of bounce, and it is possible to prevent a decrease in fuel injection pressure and a change in injection amount due to pressure leakage.

Further, during the valve opening operation of the valve body, the communication passage opening / closing mechanism opens the communication passage to allow the fuel supply from the second fuel chamber to the first fuel chamber, so that the valve opening response is improved. Can be made.

Further, according to the fifth aspect of the invention, since the valve body is provided with the buffer mechanism for urging the force in the direction in which the lowering operation of the valve body is hindered when the valve body is lowered to the predetermined lowering position, It is possible to prevent a strong contact with the body, which can prevent a bounce between the valve body and the body. Therefore, a decrease in fuel injection pressure due to a pressure leak and an injection amount fluctuation can be prevented. It is possible to prevent the occurrence of fuel injection and to appropriately control the fuel injection amount.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an electromagnetic spill valve that is a first embodiment of the present invention.

FIG. 2 is a diagram for explaining the operation of the electromagnetic spill valve that is the first embodiment of the present invention.

FIG. 3 is a diagram for explaining the operation of the electromagnetic spill valve that is the first embodiment of the present invention.

FIG. 4 is a diagram for explaining the operation of the electromagnetic spill valve according to the first embodiment of the present invention.

FIG. 5 is a diagram for explaining the operation of the electromagnetic spill valve that is the first embodiment of the present invention.

FIG. 6 is a diagram for explaining the operation of the electromagnetic spill valve according to the first embodiment of the present invention.

FIG. 7 is a sectional view of an electromagnetic spill valve according to a second embodiment of the present invention.

FIG. 8 is a diagram showing a relationship between a lift amount and an area of a relief passage of an electromagnetic spill valve according to a second embodiment of the present invention.

FIG. 9 is a sectional view of an electromagnetic spill valve according to a third embodiment of the present invention.

FIG. 10 is a diagram for explaining the operation of the one-way orifice.

FIG. 11 is a diagram for explaining the operation of the one-way orifice.

FIG. 12 is a sectional view of an electromagnetic spill valve according to a fourth embodiment of the present invention.

FIG. 13 is a diagram showing a relationship between a drive signal supplied to an electromagnetic spill valve according to a fourth embodiment of the present invention and a lift amount of a needle valve.

FIG. 14 is a sectional view of an electromagnetic spill valve according to a fifth embodiment of the present invention.

FIG. 15 is a diagram showing a lift amount of a needle valve of an electromagnetic spill valve according to a fifth embodiment of the present invention.

FIG. 16 is a sectional view of an electromagnetic spill valve according to a sixth embodiment of the present invention.

[Explanation of symbols]

 1 body 2 solenoid 3 valve spring 4 needle valve 5 ball spring 6 check ball 7 orifice 8 damper chamber 9 cap 10 armature chamber 11 fuel inlet passage 12 body seat surface 13 fuel outlet passage 14 needle guide surface 15 body end surface 16 armature guide surface 17 Upper surface of the body 18 Fuel intake passage 20 Spill passage 22 Space portion 25 One-way orifice 30 Dump spring 31, 32 Magnet 41 Needle portion 42, 46 Sliding surface 43 Bulb seat surface 44 Armature portion 47 Fuel escape surface 48 Fuel escape groove 49 Armature upper slide Surface 51 Step 100 ECU 101, 102 Drive circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Osamu Hishinuma 1-chome, Showa-cho, Kariya city, Aichi Nihon Denso Co., Ltd. Automotive Parts Research Institute

Claims (5)

[Claims] 1. A spill passage having an inlet passage and an outlet passage formed in a body, a solenoid disposed in the body for generating an electromagnetic force, and a needle portion for opening and closing the spill passage, In an electromagnetic valve device comprising a valve body composed of an armature part for displacing the needle part by applying an electromagnetic force of the solenoid, a space part in which the armature part is displaced in the body is defined by the armature part. The first fuel chamber and the second fuel chamber are liquid-tightly defined by the above, and at the time of the valve closing operation of the valve body, until the armature portion descends to a predetermined descending position, The first fuel chamber and the second fuel chamber are communicated with each other to allow the fuel in the first fuel chamber to escape to the second fuel chamber, and the armature portion is closed by being lowered from the predetermined lowering position. In the first fuel chamber And a relief passage configured to prevent the fuel from escaping to the second fuel chamber, the second fuel chamber and the first fuel chamber being communicated with each other when the valve body is opened. An electromagnetic valve device, comprising: a supply passage provided with a valve mechanism that allows only fuel supply from the second fuel chamber to the first fuel chamber. 2. The electromagnetic valve device according to claim 1, wherein the escape passage is formed by a gap formed between an outer peripheral surface formed on the armature portion and an inner peripheral surface of an armature guide formed on the body. And an outer peripheral surface of the armature guide is tapered toward the lower end, and a step portion projecting inward is formed on the inner peripheral surface of the armature of the body. . 3. A spill passage consisting of an inlet passage and an outlet passage formed in the body, a solenoid arranged in the body for generating an electromagnetic force, and a needle portion for opening and closing the spill passage, In an electromagnetic valve device comprising a valve body composed of an armature part for displacing the needle part by applying an electromagnetic force of the solenoid, a space part in which the armature part is displaced in the body is defined by the armature part. The first fuel chamber and the second fuel chamber are liquid-tightly defined by the above, and the spill passage and the first fuel chamber formed in the lower portion of the armature portion are communicated with each other. A supply passage serving as a passage for supplying fuel from the passage to the first fuel chamber, a communication passage connecting the first fuel chamber and the second fuel chamber, and a communication passage arranged in the communication passage. A first fuel chamber and a second fuel chamber And a one-way orifice for changing the flow rate of the fuel depending on the flow direction of the fuel. 4. A spill passage consisting of an inlet passage and an outlet passage formed in the body, a solenoid arranged in the body for generating an electromagnetic force, and a needle portion for opening and closing the spill passage, In an electromagnetic valve device comprising a valve body composed of an armature part for displacing the needle part by applying an electromagnetic force of the solenoid, a space part in which the armature part is displaced in the body is defined by the armature part. The first fuel chamber and the second fuel chamber are liquid-tightly defined by the above, and the spill passage and the first fuel chamber formed in the lower portion of the armature portion are communicated with each other. A supply passage serving as a passage for supplying fuel from the passage to the first fuel chamber, a communication passage that connects the first fuel chamber and the second fuel chamber, and the armature when the valve body is closed. Part descends to a predetermined descending position Until then, the communication passage is opened to allow the fuel in the first fuel chamber to escape to the second fuel chamber, and the armature portion is lowered from the predetermined lower position to close the communication passage. It is possible to prevent the fuel in the first fuel chamber from escaping to the second fuel chamber, and to open the communication passage during the valve opening operation of the valve body to open the first fuel chamber from the second fuel chamber. A solenoid valve device, comprising: a communication passage opening / closing mechanism that allows fuel to be supplied to a fuel chamber. 5. A spill passage formed in the body, the spill passage including an inlet passage and an outlet passage, a solenoid disposed in the body for generating an electromagnetic force, and a needle portion for opening and closing the spill passage. In a solenoid valve device comprising a valve body composed of an armature portion that displaces the needle portion by applying an electromagnetic force of the solenoid, the valve body moves to a predetermined lowered position when the valve body closes. An electromagnetic valve device comprising a buffer mechanism for urging a force in a direction that impedes the descending operation of the valve element when the valve element descends.