JP2022175113A - Electromagnetic valve and high pressure fuel pump using the same - Google Patents

Abstract

To provide a technology which can reduce collision noise of an armature when an electromagnetic valve is closed.SOLUTION: An electromagnetic valve 60 according to one embodiment of the disclosure includes a valve member 64, a fixed core 80, a coil 90, and an armature 74. The valve member reciprocates to separate from a valve seat 62a or be seated on the valve seat and thereby open or close a passage 212. The coil is energized to generate magnetic flux. The armature reciprocates with the valve member and is attracted to the fixed core side by the magnetic flux generated by the coil. A direction in which the valve member is seated on the valve seat is a direction in which the armature is separated from the valve member. A bottomed insertion hole 74a is formed at one of the armature and the valve member. An insertion part 64a which is inserted into the insertion hole so as to be movable in a reciprocating direction of the valve member and the armature is formed at the other of the armature and the valve member.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a solenoid valve in which a valve member that reciprocates with an armature opens and closes a flow path.

A solenoid valve is known that opens and closes a flow path by reciprocating a valve member with an armature to separate from or sit on a valve seat. Patent Literature 1 below describes a technique in which a valve member is inserted into a through hole formed in an armature and reciprocates with the armature while being in contact with the armature.

DE 102013218844 A1

As a result of detailed studies by the inventor, in the technique described in Patent Document 1, the valve member is inserted into the through hole formed in the armature. moves further toward the stopper while the valve member is inserted in the through hole. As a result, in the technique described in Patent Literature 1, a problem was found in that the collision sound of the armature colliding with the stopper became louder.

In one aspect of the present disclosure, it is desirable to provide a technique for reducing armature collision noise when a solenoid valve is closed.

A solenoid valve according to one aspect of the present disclosure comprises a valve member (64, 112), a stationary core (80), a coil (90) and an armature (74, 114).
The valve member opens and closes the flow path (212) by reciprocating and separating from or sitting on the valve seat (62a). The coil generates magnetic flux when energized. The armature reciprocates together with the valve member and is attracted to the fixed core side by the magnetic flux generated by the coil, and the direction in which the valve member is seated on the valve seat is the direction away from the valve member.

Further, bottomed insertion holes (74a, 112a) are formed in one of the armature and the valve member, and the other of the armature and the valve member is inserted into the insertion hole so as to be movable in the reciprocating direction of the valve member and the armature. An insertion portion (64a, 114a) is formed.

A high-pressure fuel pump according to another aspect of the present disclosure adjusts the amount of fuel to be discharged by the solenoid valve.
According to such a configuration, since the insertion hole has a bottom, the armature is separated from the valve member by the valve member being seated on the valve seat and stopped while the valve member is inserted into the insertion hole. Then, the force acts in the direction opposite to the direction of separation.

This force in the opposite direction is generated, for example, by negative pressure generated when the space formed by the insertion portion and the insertion hole becomes large while the insertion portion is inserted into the insertion hole. This force in the opposite direction is generated by the attraction force acting on the contact surfaces where the valve member and the armature face and contact each other in the reciprocating direction when the insertion portion is inserted into the insertion hole.

In this way, when the valve member is seated on the valve seat and stops, a force acts in the direction opposite to the direction in which the armature separates from the valve member. decreases. Therefore, when the solenoid valve is closed, it is possible to reduce the collision noise when the armature collides with the stopper and stops.

FIG. 2 is a schematic cross-sectional view showing the high-pressure fuel pump of the first embodiment; Sectional drawing which shows the solenoid valve of a high-pressure fuel pump. Sectional drawing which shows the state which the armature collided with the fixed core. 4 is a time chart showing the amount of lift between the armature and the valve member; Sectional drawing which shows the electromagnetic valve of 2nd Embodiment. Sectional drawing which shows the electromagnetic valve of 3rd Embodiment. Sectional drawing which shows the electromagnetic valve of 4th Embodiment. Sectional drawing which shows the solenoid valve of 5th Embodiment. Sectional drawing which shows the electromagnetic valve of 6th Embodiment. Sectional drawing which shows the electromagnetic valve of 7th Embodiment. Sectional drawing which shows the electromagnetic valve of 8th Embodiment.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.
[1. First Embodiment]
[1-1. Constitution]
The high-pressure fuel pump 20 shown in FIG. 1 includes a pump housing 30, a plunger 40, a discharge valve 50, and an electromagnetic valve 60. The high-pressure fuel pump 20 pressurizes the fuel sucked up from the fuel tank 2 by the low-pressure pump 4 and supplies it to the common rail 6 . A common rail 6 supplies fuel to an injector 8 which injects fuel into the internal combustion engine.

The head 40 a of the plunger 40 is in contact with the cam 12 of the camshaft 10 due to the load of the spring 42 . As the cam 12 rotates and the head 40a reciprocates according to the cam profile, the plunger 40 reciprocates.

Fuel supplied from the low-pressure pump 4 is sucked into the pressurization chamber 200 during the suction stroke in which the plunger 40 descends. In the pumping stroke in which the plunger 40 rises, the fuel in the pressure chamber 200 is pressurized and discharged from the discharge valve 50 to the common rail 6 .

The solenoid valve 60 is controlled to open and close by an electronic control device (not shown). When the electromagnetic valve 60 is opened, the low-pressure pump 4 side and the pressurization chamber 200 are communicated with each other. When the solenoid valve 60 is closed, communication between the low-pressure pump 4 side and the pressurizing chamber 200 is cut off.

When the solenoid valve 60 is closed during the pumping stroke, the fuel in the pressure chamber 200 is pressurized by the rise of the plunger 40 and discharged from the discharge valve 50 . Therefore, the amount of fuel discharged from the discharge valve 50 of the high-pressure fuel pump 20 is adjusted by controlling the closing timing of the solenoid valve 60 in the pumping stroke. That is, the solenoid valve 60 is used as a metering valve for the high-pressure fuel pump 20 .

Next, the configuration of the solenoid valve 60 will be described with reference to FIG.
The solenoid valve 60 includes a valve body 62, a valve member 64, a spring seat 70, a spring 72, an armature 74, a spring 76, a fixed core 80, a yoke 82, a housing member 84, and a non-magnetic member 86. and a coil 90.

A plurality of fuel passages 212 are formed in the valve body 62 to guide the fuel supplied from the low-pressure pump 4 to the annular fuel passage 210 to the pressurizing chamber 200 . The valve body 62 supports the valve member 64 so as to be able to reciprocate. Further, the valve body 62 is formed with a valve seat 62a on which the valve member 64 is seated.

When the valve member 64 is seated on the valve seat 62a, the electromagnetic valve 60 is closed and communication between the fuel flow path 212 and the pressurizing chamber 200 is cut off. When the valve member 64 is separated from the valve seat 62a, the solenoid valve 60 is opened, and the fuel passage 212 and the pressurizing chamber 200 are communicated. In other words, the valve member 64 opens and closes the fuel flow path 212 by being separated from the valve seat 62a or being seated on the valve seat 62a.

An insertion portion 64 a of the valve member 64 formed on the opposite side of the valve seat 62 a is inserted into an insertion hole 74 a formed in the armature 74 . The clearance between the inner peripheral surface of the insertion hole 74a of the armature 74 and the outer peripheral surface of the insertion portion 64a of the valve member 64 is 10 μm or more and 30 μm or less.

The spring seat 70 is secured to the valve member 64 by, for example, welding. The spring 72 applies a load to the spring seat 70 in the closing direction of the solenoid valve 60, that is, in the direction in which the valve member 64 is seated on the valve seat 62a.

The armature 74 is installed at a position facing the fixed core 80 on the opposite side of the valve member 64 from the valve seat 62a. The armature 74 is formed with a bottomed insertion hole 74a into which the insertion portion 64a of the valve member 64 is inserted. When the electromagnetic valve 60 is closed, the bottom surface of the insertion hole 74a and the end surface of the insertion portion 64a are in contact with each other.

As shown in FIG. 3, when the valve member 64 and the armature 74 are separated, the space 220 formed by the bottom surface of the insertion hole 74a and the end surface of the insertion portion 64a becomes larger.
The spring 76 applies a load to the armature 74 in the valve opening direction of the electromagnetic valve 60, that is, in the direction in which the valve member 64 is separated from the valve seat 62a. The load that the spring 76 applies to the armature 74 in the valve opening direction is greater than the load that the spring 72 applies to the spring seat 70 in the valve closing direction.

Therefore, when the coil 90 is de-energized and no magnetic attraction force is generated between the armature 74 and the fixed core 80, the difference in load between the springs 76 and 72 causes the valve member 64 to move away from the valve seat 62a. It sits down and the electromagnetic valve 60 opens.

A fixed core 80 is installed on the opposite side of the armature 74 from the valve member 64 . Yoke 82 covers the outer periphery of coil 90 . The housing member 84 is installed on the outer peripheral side of the armature 74 between the fixed core 80 and the valve body 62 .

A space 230 for accommodating the armature 74 and the valve member 64 is formed on the inner peripheral side of the accommodating member 84 around the armature 74 and the valve member 64 . The inner peripheral surface of the housing member 84 guides the outer peripheral surface of the armature 74 in the reciprocating direction.

The fixed core 80, the armature 74, the yoke 82, and the housing member 84 described above are made of a magnetic material and form a magnetic circuit.
The nonmagnetic member 86 is installed between the fixed core 80 and the housing member 84 on the outer peripheral side of the armature 74 . The non-magnetic member 86 prevents magnetic short-circuiting between the fixed core 80 and the housing member 84 .

The coil 90 is accommodated between the outer peripheral side of the accommodating member 84 and the inner peripheral side of the yoke 82 . When the coil 90 is energized, the magnetic flux generated by the coil 90 flows through the magnetic circuit formed by the fixed core 80 , the armature 74 , the housing member 84 and the yoke 82 .

The coil 90 generates a magnetic flux that flows between the armature 74 and the fixed core 80 , thereby generating a magnetic attraction force that attracts the armature 74 toward the fixed core 80 side. This magnetic attraction force acts in the direction in which the valve member 64 is seated on the valve seat 62a. The magnetic flux generated by the coil 90 causes the air attraction force acting in the direction in which the valve member 64 is seated on the valve seat 62a. greater than the working force.

Therefore, when the coil 90 is energized, the valve member 64 is seated on the valve seat 62a against the force acting on the valve member 64 in the valve opening direction due to the load difference between the springs 76 and 72. , the solenoid valve 60 is closed.

[1-2. operation]
As shown in FIG. 2, when the coil 90 is de-energized, the difference in load between the spring 76 and the spring 72 causes the valve member 64 to separate from the valve seat 62a and the electromagnetic valve 60 to open. In this case, fuel flow path 212 and pressurization chamber 200 communicate with each other.

When the coil 90 is energized and the armature 74 is attracted toward the fixed core 80 against the load difference between the spring 76 and the spring 72, the spring seat 70 and the valve member 64 are pulled together by the load of the spring 72. moves in the valve closing direction together with the armature 74 .

As shown in FIG. 3, when the valve member 64 moves in the valve closing direction and is seated on the valve seat 62a, communication between the fuel flow path 212 and the pressurizing chamber 200 is blocked.
As shown in FIG. 4, even when the valve member 64 is seated on the valve seat 62a, the armature 74 has not yet collided with the fixed core 80 and moves further toward the fixed core 80. As shown in FIG. Then, forces described in (1) and (2) below act on the armature 74 .

(1) The end surface of the insertion portion 64a of the valve member 64 and the bottom surface of the insertion hole 74a tend to leave the contact state. Since the end surface of the insertion portion 64a and the bottom surface of the insertion hole 74a are in contact with each other through the fuel, an adsorption force acts. As a result, an attractive force acts in the direction in which the armature 74 does not separate from the valve member 64 .

(2) When the end surface of the insertion portion 64a of the valve member 64 and the bottom surface of the insertion hole 74a are in contact with each other, as shown in FIG. The space 220 formed between is going to grow. As a result, a negative pressure is generated in this space 220 , so that a force acts in the direction in which the armature 74 does not separate from the valve member 64 .

Due to the forces acting in (1) and (2) described above, the moving speed of the armature 74 toward the fixed core 80 after the valve member 64 is seated on the valve seat 62a is reduced. Then, as indicated by the dotted line in FIG. 4, the armature 74 collides with the fixed core 80 while the speed is reduced.

[1-3. effect]
According to the first embodiment described above, the following effects can be obtained.
(1a) When the electromagnetic valve 60 is closed, the armature 74 collides with the fixed core 80 in a state of reduced speed, so that the collision noise of the armature 74 colliding with the fixed core 80 when the valve is closed can be reduced.

(1b) By inserting the insertion portion 64a into the insertion hole 74a without adding a new member, it is possible to reduce the impact noise of the armature 74 colliding with the fixed core 80 when the valve is closed.
(1c) Since the outer peripheral surface of the armature 74 is guided in the reciprocating direction by the inner peripheral surface of the housing member 84, the armature 74 can be stably guided in the reciprocating direction.
(1d) Since the insertion hole 74a is formed in the armature 74 which is larger in size than the valve member 64, the insertion hole 74a can be easily machined.

In the first embodiment, the solenoid valve 60 corresponds to the metering valve, and the fixed core 80 corresponds to the stopper.
[2. Second Embodiment]
[2-1. Differences from First Embodiment]
Since the basic configuration of the second embodiment is the same as that of the first embodiment, differences will be described below. Note that the same reference numerals as in the first embodiment indicate the same configurations, and refer to the preceding description.

In the first embodiment described above, the bottom of the insertion hole 74a of the armature 74 is closed, and the space 220 is blocked. On the other hand, as shown in FIG. 5, the armature 74 of the electromagnetic valve 100 of the second embodiment is formed with an orifice 240 that penetrates the armature 74 and communicates the space 220 and the space 230. It differs from the first embodiment.

By forming the orifice 240, when the solenoid valve 100 is closed, the absolute value of the negative pressure generated in the space 220 formed between the end surface of the insertion portion 64a of the valve member 64 and the bottom surface of the insertion hole 74a. becomes smaller.

[2-2. effect]
According to the second embodiment described above, in addition to the effects (1a) to (1d) of the first embodiment, the following effects can be obtained.

(2a) By adjusting the diameter of the orifice 240, the speed at which the armature 74 collides with the fixed core 80 when the solenoid valve 100 is closed can be adjusted.
In addition, in the said 2nd Embodiment, the electromagnetic valve 100 respond|corresponds to a metering valve.
[3. Third Embodiment]
[3-1. Differences from First Embodiment]
Since the basic configuration of the third embodiment is the same as that of the first embodiment, differences will be described below. Note that the same reference numerals as in the first embodiment indicate the same configurations, and refer to the preceding description.

In the first embodiment described above, the insertion portion 64 a formed in the valve member 64 is inserted into the insertion hole 74 a formed in the armature 74 .
On the other hand, the electromagnetic valve 110 of the third embodiment shown in FIG. differ.

The inner peripheral surface of the housing member 84 guides the outer peripheral surface of the armature 114 in the reciprocating direction. A bottomed insertion hole 112a is formed on the armature 114 side of the valve member 112 . An insertion portion 114a is formed on the valve member 112 side of the armature 114 to be inserted into the insertion hole 112a. A clearance between the outer peripheral surface of the insertion portion 114a of the armature 114 and the outer peripheral surface of the insertion portion 112a of the valve member 112 is 10 μm or more and 30 μm or less.

[3-2. effect]
According to the third embodiment described above, the same effects as the effects (1a) to (1c) of the first embodiment can be obtained.
In addition, in the said 3rd Embodiment, the solenoid valve 110 respond|corresponds to a metering valve.

[4. Fourth Embodiment]
[4-1. Differences from the Third Embodiment]
Since the basic configuration of the fourth embodiment is the same as that of the third embodiment, differences will be described below. The same reference numerals as in the third embodiment indicate the same configurations, and the preceding description is referred to.

In the third embodiment described above, the space 220 formed by the end surface of the insertion portion 114a of the armature 114 and the bottom surface of the insertion hole 112a of the valve member 112 is closed.
On the other hand, in the electromagnetic valve 120 of the fourth embodiment shown in FIG. 7, the orifice 240 communicates the space 220 with the space 230 around the valve member 112 and the armature 114, which is the difference from the first embodiment. do. Orifice 240 is formed through armature 114 in the reciprocating direction.

By forming the orifice 240, when the electromagnetic valve 120 is closed, the absolute value of the negative pressure generated in the space 220 formed by the end surface of the insertion portion 114a of the armature 114 and the bottom surface of the insertion hole 112a of the valve member 112. becomes smaller.

[4-2. effect]
According to the fourth embodiment described above, the following effects can be obtained in addition to the effects of the third embodiment described above.

(4a) By adjusting the diameter of the orifice 240, the speed at which the armature 114 collides with the fixed core 80 when the solenoid valve 120 is closed can be adjusted.
In addition, in the said 4th Embodiment, the electromagnetic valve 120 respond|corresponds to a metering valve.

[5. Fifth Embodiment]
[5-1. Differences from the Third Embodiment]
Since the basic configuration of the fifth embodiment is the same as that of the third embodiment, differences will be described below. The same reference numerals as in the third embodiment indicate the same configurations, and the preceding description is referred to.

In the third embodiment described above, the space 220 formed by the end surface of the insertion portion 114a of the armature 114 and the bottom surface of the insertion hole 112a of the valve member 112 is closed.
On the other hand, in the electromagnetic valve 130 of the fifth embodiment shown in FIG. 8, the orifices 250, 252 communicate the space 220 with the space 230 around the valve member 1112 and the armature 114, which is different from that of the third embodiment. differ from

The orifices 250 and 252 are formed radially penetrating the peripheral wall of the valve member 112 forming the insertion hole 112 a and the peripheral wall of the spring seat 70 . Orifice 250 and orifice 252 are in communication.

By forming the orifices 250 and 252, when the solenoid valve 130 is closed, the negative pressure generated in the space 220 formed by the end surface of the insertion portion 114a of the armature 114 and the bottom surface of the insertion hole 112a of the valve member 112 is reduced. absolute value becomes smaller.

[5-2. effect]
According to the fifth embodiment described above, the same effects as those of the fourth embodiment can be obtained.
In addition, in the said 5th Embodiment, the electromagnetic valve 130 respond|corresponds to a metering valve.

[6. Sixth Embodiment, Seventh Embodiment, Eighth Embodiment]
[6-1. Differences between the sixth embodiment and the third embodiment, differences between the seventh embodiment and the fourth embodiment, differences between the eighth embodiment and the fifth embodiment]
The basic configuration of the sixth embodiment is the same as that of the third embodiment, the basic configuration of the seventh embodiment is the same as that of the fourth embodiment, and the basic configuration of the eighth embodiment is the same as that of the fifth embodiment. Since it is similar to the embodiment, differences will be described below. The same reference numerals as in the third to fifth embodiments indicate the same configurations, and the preceding description is referred to.

In the third to fifth embodiments described above, the armature 114 was guided in the reciprocating direction by the inner peripheral surface of the housing member 84 .
On the other hand, in the solenoid valve 140 of the sixth embodiment shown in FIG. 9, the solenoid valve 150 of the seventh embodiment shown in FIG. 10, and the solenoid valve 160 of the eighth embodiment shown in FIG. The difference from the third to fifth embodiments is that the insertion portion 114a of the valve member 112 is guided in the reciprocating direction by the inner peripheral surface of the insertion hole 112a of the valve member 112 into which the insertion portion 114a is inserted.

[6-2. effect]
According to the solenoid valves 140, 150, 160 of the sixth to eighth embodiments described above, the same effects as the effects (1a), (1b) of the first embodiment can be obtained.
Incidentally, in the sixth to eighth embodiments, the solenoid valves 140, 150, 160 correspond to the metering valves.

[7. Other embodiments]
Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above embodiments, and various modifications can be made.

(7a) In the above embodiments, the solenoid valves 60, 100, 110, 120, 130, 140, 150, and 160 are used as the control valves of the high-pressure fuel pump, but the present invention is not limited to this. As long as the valve member reciprocates together with the armature to open and close the flow path, the electromagnetic valve of the above embodiments may be used for any purpose.

(7b) In the above embodiment, the fixed core 80 also serves as a stopper for stopping the movement of the armatures 74 and 114 when the valve is closed, but the present invention is not limited to this. A member other than the fixed core 80 may be used as a stopper.

(7c) In the first embodiment and the second embodiment, the armature 74 is guided in the reciprocating direction by the inner peripheral surface of the housing member 84 . On the other hand, the armature 74 may be guided in the reciprocating direction by the outer peripheral surface of the insertion portion 64a of the valve member 64 inserted into the insertion hole 74a of the armature 74 .

(7d) A plurality of functions possessed by one component in the above embodiment may be realized by a plurality of components, or a function possessed by one component may be realized by a plurality of components. . Also, a plurality of functions possessed by a plurality of components may be realized by a single component, or a function realized by a plurality of components may be realized by a single component. Also, part of the configuration of the above embodiment may be omitted. Also, at least part of the configuration of the above embodiment may be added or replaced with respect to the configuration of the other above embodiment.

(7e) In addition to the electromagnetic valve described above, the present disclosure can also be implemented in various forms, such as a system including the electromagnetic valve as a component.

20: high-pressure fuel pump 60, 100, 110, 120, 130, 140, 150, 160: solenoid valve (control valve) 62a: valve seat 64, 112: valve member 64a, 114a: insertion portion 74 , 114: armature, 74a, 112a: insertion hole, 80: fixed core (stopper), 84: housing member, 90: coil, flow path: 212, space: 220, 230, orifice: 240, 250, 252

Claims (9)

a valve member (64, 112) that reciprocates to open and close the flow path (212) by separating from or sitting on the valve seat (62a);
a stationary core (80);
a coil (90) that generates a magnetic flux when energized;
an armature (74, 114) that reciprocates together with the valve member, is attracted to the fixed core side by the magnetic flux generated by the coil, and the direction in which the valve member is seated on the valve seat is the direction away from the valve member; ,
with
A bottomed insertion hole (74a, 112a) is formed in either the armature or the valve member, and the other of the armature or the valve member is movable in the reciprocating direction of the valve member and the armature. An insertion portion (64a, 114a) to be inserted into the insertion hole is formed.
solenoid valve. The solenoid valve according to claim 1,
orifices (240, 250, 252) communicating between a space (220) formed by the insertion hole and the insertion portion and a space (230) around the armature and the valve member,
solenoid valve. The solenoid valve according to claim 1 or 2,
The insertion hole (74a) is formed in the armature (74), and the insertion portion (64a) is formed in the valve member (64),
solenoid valve. The solenoid valve according to claim 1 or 2,
The insertion portion (114a) is formed in the armature (114), and the insertion hole (112a) is formed in the valve member (112).
solenoid valve. The solenoid valve according to any one of claims 1 to 4,
The armature is guided in the reciprocating direction by an inner peripheral surface of a housing member (84) that houses the armature.
solenoid valve. The solenoid valve according to claim 5,
The clearance between the inner peripheral surface of the insertion hole and the outer peripheral surface of the insertion portion is 10 μm or more and 30 μm or less.
solenoid valve. The solenoid valve according to any one of claims 1 to 4,
When the armature (74) is formed with the insertion hole (74a) and the valve member (64) is formed with the insertion portion (64a), the armature is inserted into the insertion hole. When the insertion portion (114a) is formed in the armature (114) and the insertion hole (112a) is formed in the valve member (112), the insertion portion is guided in the reciprocating direction by the inner peripheral surface of the insertion hole into which the
solenoid valve. The solenoid valve according to any one of claims 1 to 7,
Used as a metering valve for metering the discharge of a high-pressure fuel pump (20) that supplies fuel to an internal combustion engine,
solenoid valve. A high-pressure fuel pump (20) for metering the amount of fuel discharged by solenoid valves (60, 100, 110, 120, 130, 140, 150, 160),
The solenoid valve is
a valve member (64, 112) that reciprocates to open and close the flow path (212) by separating from or sitting on the valve seat (62a);
a fixed core (80);
a coil (90) that generates a magnetic flux when energized;
an armature (74, 114) that reciprocates together with the valve member, is attracted to the fixed core side by the magnetic flux generated by the coil, and the direction in which the valve member is seated on the valve seat is the direction away from the valve member; ,
with
A bottomed insertion hole (74a, 112a) is formed in either the armature or the valve member, and the other of the armature or the valve member is movable in the reciprocating direction of the valve member and the armature. An insertion portion (64a, 114a) to be inserted into the insertion hole is formed.
high pressure fuel pump.

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