JP3438532B2 - Solenoid driven valve - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetically driven valve, and more particularly to an electromagnetically driven valve including a magnetic core having a laminated structure.

[0002]

2. Description of the Related Art Generally, an electromagnetically driven valve comprises a plunger for driving a valve body and an electromagnet for attracting the plunger. When the electromagnet is excited, the electromagnetic force attracts the plunger toward the electromagnet. Then, the electromagnetically driven valve is opened and closed by driving the valve body according to the displacement of the plunger. The electromagnet includes a core made of a magnetic material and a coil housed inside the core. When the excited state of the electromagnet changes, eddy current is generated in the core.
The eddy current generated in the core acts so as to cancel the electromagnetic force generated by the electromagnet. Therefore, in order to secure the performance of the electromagnetically driven valve, it is required to suppress the eddy current generated in the core.

As a structure capable of reducing the eddy current generated in the core, there has been conventionally known, for example, Japanese Patent Laid-Open No. 6-17692.
The core disclosed in No. 1 is known. The conventional core is formed by stacking a plurality of magnetic plates spirally in the circumferential direction. According to this structure, a plurality of magnetic plates are laminated in the direction of the eddy current generated in the core, that is, in the circumferential direction of the core, thereby increasing the resistance to the eddy current, and as a result, suppressing the eddy current generated in the core. To be done. Therefore, by applying the above conventional core configuration to the electromagnet of the electromagnetically driven valve, it is possible to prevent the performance of the electromagnetically driven valve from being deteriorated due to the eddy current of the core.

[0004]

When the core has a spiral laminated structure like the above-mentioned conventional core, its strength is lowered and the core is apt to be deformed. On the other hand, in the electromagnetically driven valve, when the electromagnet is energized, the plunger is displaced until it comes into contact with the core of the electromagnet. Therefore, when the above conventional core structure is applied to the electromagnet of the electromagnetically driven valve, when the impact force is repeatedly applied to the core due to the contact between the plunger and the core, the core gradually deforms.
If the core is deformed, the desired characteristics of the electromagnetically driven valve cannot be obtained because the gap between the core and the plunger changes. As described above, if the conventional core structure is applied to the electromagnetically driven valve as it is, the durability of the core is deteriorated.

The present invention has been made in view of the above points, and it is an object of the present invention to improve the durability of an electromagnetically driven valve including a magnetic core having a laminated structure.

[0006]

The above-mentioned object is defined in claim 1.
And an electromagnet having a core formed by laminating a plurality of magnetic plates, and an electromagnetic force generated by the electromagnet.
Supports an armature that is sucked in more and can be displaced in the axial direction
So that the armature faces the end surface of the core.
And a valve body that opens and closes according to the displacement of the plunger, and the circumference of the core of the electromagnet.
A contact member that is provided on a surface, contacts the plunger in a state where the armature is attracted to the electromagnet, and forms a predetermined gap between the armature and the core;
Is achieved by an electromagnetically driven valve.

In the present invention, the core of the electromagnet is formed by laminating a plurality of magnetic plates. Therefore, the strength of the core is low and the core is easily deformed. Contact members provided on the peripheral surface of the core of the electromagnet, with the armature <br/> is attracted to the electromagnet, the plunger abuts, A
-Create a gap between the maca and the core. Therefore, according to the present invention, since the armature and the core do not come into contact with each other, the deformation of the core is prevented. Also, the contact member is
Since it is provided on the peripheral surface of the core, the contact member is
The axial impact force received from the flanger is transmitted to the end surface of the core.
Never be done. Therefore, according to the present invention, in particular
Prevents the transmission of impact force to the end face of the laminated structure core
It is possible to stop. The contact member is the peripheral surface of the core.
Provided on the inner or outer peripheral surface of the core as long as
May be provided on the peripheral surface between the inner peripheral surface and the outer peripheral surface.
Yes.

The above-mentioned object is as described in claim 2.
In the electromagnetically driven valve according to claim 1, wherein said abutment member,
A slit made of soft magnetic material over the entire axial length
And the plunger is made of a non- magnetic material, which is more effectively achieved by an electromagnetically driven valve.

In the present invention, the abutting member is a substantially cylindrical portion.
It is made of soft magnetic material. For this reason, an eddy current is generated in the circumferential direction of the contact member along with the operation of the electromagnetically driven valve. However, the contact member is axially
By having the slit over the entire length , such an eddy current is suppressed. Meanwhile, the plunger, the armature being composed of magnetic material, while retaining the outer peripheral portion, the plunger itself is composed of a nonmagnetic material. Therefore, when the excitation of the electromagnet is cut off, it is possible to prevent the attraction force from acting between the contact member and the plunger due to the residual magnetism of the contact member. Therefore, according to the present invention, the contact member can be made of a soft magnetic material without deteriorating the performance of the electromagnetically driven valve.

[0010]

1 is a block diagram of an electromagnetically driven valve according to an embodiment of the present invention. In FIG. 1, the electromagnetically driven valve of this embodiment is applied as an intake valve of an internal combustion engine.
As shown in FIG. 1, the electromagnetically driven valve includes a valve body 12.
The valve body 12 constitutes an intake valve of the internal combustion engine. Disc 12
Are disposed in the lower head 16 so as to be exposed in the combustion chamber 14 of the internal combustion engine. An intake port 18 is formed in the lower head 16. The valve body 12 is installed in the intake port 18.
A valve seat 20 is formed. Intake port 18
Is brought into a conducting state when the valve body 12 is separated from the valve seat 20, and is brought into a shut-off state when the valve body 12 is seated on the valve seat 20. An upper head 22 is connected to an upper portion of the lower head 16.

A valve shaft 24 is fixed to the valve body 12.
The valve shaft 24 is held by a valve guide 26 so as to be slidable in the axial direction. The valve guide 26 is the lower head 16.
Held in. A cylindrical portion 28 is formed at a portion surrounding the upper half of the valve shaft 24 of the lower head 16. Also,
A lower retainer 30 is fixed to the upper end of the valve shaft 24. Between the lower retainer 30 and the bottom surface of the cylindrical portion 24,
A lower spring 32 that generates a biasing force that separates the two is disposed. The lower spring 32 urges the valve shaft 24 and the valve body 12 upward via the lower retainer 30, that is, in the direction toward the valve seat 20.

The lower end surface of the plunger 36 is in contact with the upper end surface of the valve shaft 24. The plunger 36 is a non-magnetic member formed in a rod shape. An upper retainer 38 is fixed to the upper end of the plunger 36. The lower end of the upper spring 40 is in contact with the upper part of the upper retainer 38. A cylindrical upper cap 42 is arranged around the upper spring 40. An adjuster bolt 44 is screwed onto the upper portion of the upper cap 42. The upper end of the upper spring 40 is in contact with the adjuster bolt 44. Upper spring 40
Urges the plunger 36 downwards via the appertainer 38.

An armature holding portion 36a is formed on the outer periphery of the axially intermediate portion of the plunger 36 so as to project outward in the radial direction. Around the armature holding portion 36a,
The armature 46 is joined. The armature 46 is an annular member made of a soft magnetic material. A first core portion 48 is arranged above the armature 46. A second core portion 50 is arranged below the armature 46. The first core portion 48 and the second core portion 50 have the same structure, and are arranged vertically symmetrically. Hereinafter, the configuration of the first core portion 48 will be representatively described with reference to FIG. 2.

FIG. 2 is an axial sectional view of the first core portion 48. Further, FIG. 3 is a diagram showing a state in which the first core portion 48 is viewed from below in FIG. As shown in FIGS. 2 and 3, the first core portion 48 includes a core 52. Core 52
Is a cylindrical member formed by stacking soft magnetic materials such as silicon steel plates formed in an involute shape in a spiral shape in the circumferential direction. An annular groove 53 is provided on one end surface (lower end surface in FIG. 2) of the core 52.
An electromagnetic coil 54 is fixed inside the annular groove 53.

When the energization state of the electromagnetic coil 54 changes,
Eddy current is generated in the core 52 in the circumferential direction. In the present embodiment, the core 52 is composed of magnetic plates that are spirally laminated in the circumferential direction, so that the eddy current generated in the core 52 is suppressed to a small level. The core 52 is also provided with a through hole 56 penetrating the center thereof in the axial direction. A core plate 58 is arranged on the other end surface (upper end surface in FIG. 2) side of the core 52. The core plate 58 is a disk-shaped member having a larger diameter than the core 52. The core plate 58 has a through hole 56 in the core 52.
A through hole 60 is provided coaxially with. Through hole 60
Is the large diameter portion 60a provided on the core 52 side and the core 52
And a small diameter portion 60b provided on the opposite side.

The first core portion 48 also includes a sleeve 62. The sleeve 62 is a tubular member made of a soft magnetic material. The sleeve 62 is configured to have an inner diameter slightly larger than the outer diameter of the plunger 36. As will be described later, the plunger 62 is attached to the sleeve 62.
An impact force acts upon contact with 6. A plated layer of a high hardness material is provided on the surface of the sleeve 62 so that abrasion is unlikely to occur even when receiving such an impact force.

The sleeve 62 has a large diameter portion 62a and a small diameter portion 62b provided on the upper end side of the large diameter portion 62a in FIG.
It has and. FIG. 4 shows the large diameter portion 62 a of the sleeve 62.
FIG. 6 is a cross-sectional view of the pie cut along a plane perpendicular to the axis. As shown in FIG. 4, the sleeve 62 has a slit 62a. The slit 62a is configured to extend over the entire axial length of the sleeve 62. As will be described later, the provision of the slit 62a reduces the eddy current generated in the sleeve 62 during the operation of the electromagnetically driven valve.

As shown in FIG. 2, in the sleeve 62, the small diameter portion 62b is the large diameter portion 60a of the through hole 60 of the core plate 58.
The large diameter portion 62a is press-fitted into the through hole 56 of the core 52 and is held inside the core 52. With the sleeve 62 thus held inside the core 52, the end portion on the large diameter portion 62a side is
Is configured to protrude from the end face of the above by a predetermined distance L. The core 52 and the core plate 58 are, for example,
They are fixed to each other by joining means such as laser welding, electron beam welding, brazing, or gluing.

Small diameter portion 6 of through hole 60 of core plate 58
A bearing 64 is provided at 0b. The bearing 64 is a slide bearing made of a cylindrical metal member or a resin member. In FIG. 5, the armature 46 has the first core portion 4
8 shows the suctioned state. As shown in FIG. 5, the plunger 36 penetrates the inside of the sleeve 62 in the axial direction, and is held by the bearing 64 so as to be slidable in the axial direction. Further, as described above, since the sleeve 62 is disposed so as to project from the end surface of the core 52, the displacement of the plunger 36 toward the first core portion 48 side is prevented from occurring.
And the sleeve 62 are in contact with each other and are regulated. Therefore, under such a condition, a predetermined gap G (for example, 0.03 to
A gap of about 0.1 mm) is formed.

Referring again to FIG. 1, the upper head 22
A cylindrical portion 22a is formed so as to pass through the upper and lower sides. Large diameter portions 22b and 22c having a diameter larger than that of the cylindrical portion 22a are formed at the upper end and the lower end of the cylindrical portion 22a, respectively. The core plate 58 of each of the first core portion 48 and the second core portion 50 has a spacer 66.
It is inserted into the cylindrical portion 22a until it comes into contact with the bottom surfaces of the large diameter portions 22b and 22c of the upper head 22 via the and 68.

Above the core plate 58 of the first core portion 48, the flange portion 42a formed at the lower end of the upper cap 42 is arranged. The lower cap 70 is provided below the core plate 58 of the second core portion 50.
Is provided. Then, the fixing bolt 72 penetrates the flange portion 42 a of the upper cap 42, the core plate 58 of the first core portion 48, the spacer 66, the upper head 22, the spacer 68, the core plate 58 of the second core portion 50, and the lower cap 70. The upper cap 42 is fixed to the upper head 22 and the first core portion 48 and the second core portion 50 are fixed to the inside of the upper head 22 with a predetermined gap therebetween. .
The adjuster bolt 44 described above is used for the armature 4
The neutral position of 6 is adjusted to be an intermediate point between the core 52 of the first core portion 48 and the core 52 of the second core portion 50.

Next, the operation of the electromagnetically driven valve will be described. When the exciting current is supplied to the electromagnetic coil 54 of the first core 48, the magnetic flux generated by the electromagnetic coil 54 exerts an electromagnetic attraction force on the armature 46 in the direction toward the first core portion 48. Therefore, the armature 46 is displaced toward the first core portion 48 against the biasing force of the upper spring 40. In this case, as described above, the sleeve 62 replaces the core 52.
Since the armature 46 is disposed so as to project from the end face of the armature 46, the displacement of the armature 46 is restricted by the armature holding portion 36 a coming into contact with the sleeve 62. Armature 4
When 6 is displaced until it abuts on the sleeve 62 of the first core portion 48, the valve body 12 is seated on the valve seat 20,
The electromagnetically driven valve is closed. Hereinafter, the position where the armature 46 contacts the sleeve 62 of the first core portion 48 is referred to as the armature 46, the plunger 36, or the valve closing side displacement end of the valve body 12.

When the supply of the exciting current to the electromagnetic coil 54 of the first core portion 48 is stopped while the electromagnetically driven valve is closed, the armature 46 is held at the valve closing side displacement end. The electromagnetic attraction force necessary for is lost. In this case, as described above, in the state where the armature 46 is held at the valve closing side displacement end, the gap G is formed between the armature 46 and the core 52.
Due to the formation of, the attraction force acting between the armature 46 and the first core 50 due to the residual magnetism inside the armature 46 is prevented. Further, since the plunger 36 is made of a non-magnetic material, it is possible to prevent the attraction force between the armature holding portion 36a of the plunger 36 and the sleeve 62 due to the residual magnetism inside the sleeve 62. . Therefore, the first core portion 48
When the supply of the exciting current to the electromagnetic coil 54 is stopped,
The plunger 36 is urged by the upper spring 40 to promptly start the downward displacement.

When the plunger 36 is displaced downward from the valve closing side displacement end, the valve body 12 separates from the valve seat 20, whereby the electromagnetically driven valve is opened. When an exciting current is supplied to the electromagnetic coil 54 of the second core 50 at the time when the downward displacement of the plunger 36 reaches a predetermined value, electromagnetic attraction that urges the armature 46 toward the second core portion 50. Occurs.

When the electromagnetic attraction force acts on the armature 46, the plunger 36 is displaced toward the second core portion 50 against the biasing force generated by the lower spring 32.
In this case, the displacement of the plunger 36 is restricted by the armature holding portion 36a coming into contact with the sleeve 62 of the second core portion 50. Hereinafter, the position where the armature holding portion 36a is in contact with the sleeve 62 of the second core portion 50 is referred to as the armature 46, the plunger 36, or the valve opening side displacement end of the valve body 12. In this state, the electromagnetic coil 54 of the second core unit 50
When the supply of the exciting current to the armature 46 is stopped, the electromagnetic attraction force required to hold the armature 46 at the valve-opening side displacement end disappears. Also in this case, a predetermined gap G is formed between the armature 46 and the core 52, and the plunger 3
Since 6 is made of a non-magnetic material, the plunger 36 quickly starts to be displaced upward by the urging force of the lower spring 32.

When an exciting current is supplied to the electromagnetic coil 54 of the first core portion 48 when the amount of upward displacement of the plunger 36 reaches a predetermined value, the armature 46 is moved to the first position by the electromagnetic attraction force generated by the electromagnetic coil 54. It is urged toward the 1-core portion 48. Therefore, the valve shaft 12 and the plunger 36 are displaced to the valve closing side displacement end, and the valve body 12 is seated on the valve seat 20, so that the electromagnetically driven valve is closed again.

As described above, according to this embodiment, the electromagnetic coil 54 of the first core 48 and the electromagnetic coil 54 of the second core 50 are
The magnetically driven valve can be opened and closed by alternately supplying an exciting current at appropriate timings and reciprocating the valve body 12 between the valve closing side displacement end and the valve opening side displacement end. . By the way, as described above, in the present embodiment,
By forming the core 52 from a laminated plate, eddy current generated in the core 52 is suppressed. However, when the core 52 is configured to have such a laminated structure, the strength of the end surface of the core 52 is reduced and the core is easily deformed. In this embodiment, the core 52 is arranged so that its end surface faces the armature 46. Therefore, if the armature 46 directly contacts the core 52, impact force is repeatedly applied to the end surface of the core 52 as the electromagnetically driven valve opens and closes, and the core 52 gradually deforms. Further, when an impact force is applied to the end surface of the core 52, the laminated plate is displaced so as to be displaced in the axial direction, so that the core 5
2 becomes deformed. When these deformations occur in the core 52, the gap between the core 52 and the armature 46 changes, so that the desired characteristics of the electromagnetically driven valve cannot be obtained. That is, if the armature 46 directly contacts the core 52, the durability of the core 52 will decrease.

On the other hand, in the present embodiment, as described above, when the electromagnetically driven valve is opened and closed, the armature holding portion 36a of the plunger 36 becomes the sleeve 62 of the first core portion 48 or the second core portion 50. By abutting, the sleeve 62
Impact force acts on. The impact force acting on the sleeve 62 is transmitted from the core plate 58 to the upper head 22 via the upper cap 42 or the lower cap 70. That is, with the opening / closing operation of the electromagnetically driven valve, the core 5
The impact force does not act directly on 2. Therefore, in this embodiment, the core 52 is prevented from being deformed even when the opening / closing operation of the electromagnetically driven valve is repeated, and as a result, the durability of the core 52 is improved.

Further, as described above, in this embodiment,
A gap G is formed between the armature 46 and the core 52 in a state where the armature 46 is located at the valve closing side displacement end or the valve opening side displacement end. Therefore, when the exciting current to the electromagnetic coil 54 is cut off, the attractive force acting between the armature 46 and the core 52 due to the residual magnetism inside the armature 46 is reduced. As a result, the plunger 36
The armature 46 and the armature 46 can be displaced with high responsiveness according to the on / off state of the exciting current to the electromagnetic coil 54.
As described above, according to the present embodiment, the sleeve 62 is configured to form the gap G between the core 52 and the armature 46, so that the response of the electromagnetically driven valve is improved. You can also get

Since the sleeve 62 is arranged inside the core 52, the magnetic flux generated by the electromagnetic coil 52 acts on the sleeve 62 in the axial direction thereof. Therefore, when the magnetized state of the electromagnetic coil 54 changes, a circumferential eddy current is generated in the sleeve 62. The eddy current generated in the sleeve 62 acts to cancel the magnetic flux generated by the electromagnetic coil 54. Therefore, in order to secure the desired performance of the electromagnetically driven valve, it is required to suppress the eddy current generated in the sleeve 62.

On the other hand, in this embodiment, as described with reference to FIG. 4, the sleeve 62 is provided with the slit 62a extending in the entire axial length. By providing the slit 62a, the flow path of the eddy current circulating in the sleeve 62 in the circumferential direction is blocked.
Therefore, the length of the eddy current distribution path is increased, and the effective resistance value to the eddy current is increased. Therefore, in this embodiment, the eddy current generated in the sleeve 62 is suppressed to a small level, which prevents the performance of the electromagnetically driven valve from being deteriorated due to the eddy current in the sleeve 62.

As described above, the surface of the sleeve 62 is provided with a plating layer of a high hardness material. For this reason,
The wear generated in the sleeve 62 due to the impact force caused by the contact of the sleeve 62 with the plunger 36 is suppressed. Next, an electromagnetically driven valve that is a second embodiment of the present invention will be described with reference to FIG. FIG. 6 shows a first core portion 148 and a plunger 136 included in the electromagnetically driven valve of this embodiment.
Shows the configuration of. In FIG. 6, the armature 46 is the first
The state of being sucked by the core portion 148 is shown. The electromagnetically driven valve of the present embodiment is the same as the first core portion 148 and the first core portion 148 shown in FIG. 6 in place of the first core portion 48 and the second core portion 50 in the first embodiment. It is realized by using the second core portion (not shown) having the configuration. 6, the same components as those in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted or simplified.

As shown in FIG. 6, the electromagnetically driven valve of this embodiment has a plunger 136. Plunger 136
Is a rod-shaped member made of a non-magnetic material.
The plunger 136 is axially slidably held by a bearing 64 provided on the core plate 58. The plunger 136 includes an armature holding portion 136a that projects outward in the radial direction. An armature 46 is joined around the armature holding portion 136a. The armature holding portion 136a has conical surfaces 136b on both sides in the axial direction of its base portion.

The first core portion 148 also includes the sleeve 16
Equipped with 2. The sleeve 162 is a cylindrical member made of a soft magnetic material. Similar to the sleeve 62 of the first embodiment, the sleeve 162 is provided with a slit extending along the entire axial length. The sleeve 162 includes a large diameter portion 162a and a small diameter portion 162b provided on the upper end side of the large diameter portion 162a in FIG. Sleeve 16
2, the small diameter portion 162b has a through hole 60 in the core plate 58.
Of the core 5 by being press-fitted into the large diameter portion 60a of the core 5 and the large diameter portion 162a being pressed into the through hole 56 of the core 52.
It is held inside 2. A conical contact surface 162c is provided on the inner peripheral portion of the end surface of the sleeve 162 on the large diameter portion 162b side.

In the present embodiment, the contact surface 162c provided on the sleeve 162 contacts the conical surface 136b of the armature holding portion 136b of the plunger 136 in a state where the armature 46 is attracted to the first core portion 148, Core 5
2 and the armature 46 are configured to form a predetermined gap G. Therefore, also in this embodiment, as in the first embodiment, the armature 46 is prevented from coming into contact with the core 52 due to the opening / closing operation of the electromagnetically driven valve, and thus the durability of the core 52 is improved. Has been improved.

Further, the armature 46 has the first core portion 148.
When a predetermined gap is formed between the core 52 and the armature 46 in the state of being sucked into the plunger 46,
Due to the residual magnetism, the attraction force is prevented from acting between the core 52 and the plunger 46. Therefore, also in this embodiment, an electromagnetically driven valve having excellent responsiveness is realized as in the first embodiment.

Although the sleeves 62, 162 are arranged on the inner peripheral portion of the core 52 in the first and second embodiments, the present invention is not limited to this, and the sleeve 62, 162 is not limited to this. 162 may be arranged in the outer peripheral portion of the core 52 or in the intermediate portion between the inner peripheral portion and the outer peripheral portion. That is, in the first embodiment, as long as the sleeve 62 is configured to project from the end surface of the core 52 and prevent the core 52 from coming into contact with the armature 46 and the plunger 36, any position of the core 52. May be located at.
In the second embodiment, the plunger 136 or the armature 46 is provided with a protrusion projecting toward the core 52 side in accordance with the position of the sleeve 162, and the protrusion 162 and the sleeve 162 are brought into contact with each other. do it.

In the first and second embodiments, the sleeves 62 and 162 are made of a soft magnetic material, the plungers 36 and 136 are made of a non-magnetic material, and the armature holding portions 36a and 136a thereof are made of sleeves. 62, 162 by contacting the sleeve 62,
It was decided to prevent the responsiveness of the electromagnetically driven valve from decreasing due to the residual magnetism of 162. However, the present invention is not limited to this, and the sleeves 62 and 162 may be made of a non-magnetic material. Sleeves 62, 1
When 62 is made of a non-magnetic material, the sleeve 62,
Since no residual magnetism is generated in 162, the plunger 36 and the armature 46 can be integrally formed of a soft magnetic material. Further, when the sleeves 62 and 162 are made of a non-magnetic material, eddy current is not generated in the sleeves 62 and 162, so that it is not necessary to provide the slits 62a in the sleeves 62 and 162.

That is, in the above embodiment, even if the sleeves 62 and 162 are made of either a non-magnetic material or a soft magnetic material, the performance of the electromagnetically driven valve can be secured and the durability of the core can be improved. . Therefore, according to the above-mentioned embodiment, the constituent material of the sleeves 62 and 162 is not limited to the soft magnetic material, and can be selected from a wider range of materials.

If the sleeves 62 and 162 are made of, for example, non-magnetic high hardness steel (for example, HPM75 manufactured by Hitachi Metals), the conditions for annealing the core 52 (for example, 700 to 800 ° C.). Vacuum annealing) can simultaneously cure the sleeve 62. Therefore, in this case, the surface of the sleeve 62 need not be plated to improve the wear resistance of the sleeve 62, and the manufacturing process of the electromagnetically driven valve can be simplified.

In the above embodiment, the case where the present invention is applied to the intake valve of the internal combustion engine has been described.
The present invention is not limited to this, and can be applied to an electromagnetically driven valve having any other structure including a core having a laminated structure.
In the first and second embodiments, the sleeve 6
2, 162, the plunger 36, 1
The armature 46 and the armature 46 correspond to the plunger described above, and the core 52 and the electromagnetic coil 54 correspond to the electromagnet described above.

[0042]

As described above, according to the first aspect of the present invention, it is possible to prevent the plunger from coming into contact with the core. Therefore, according to the present invention, the durability of the core can be improved. According to the second aspect of the invention, the contact member can be made of a soft magnetic material without deteriorating the characteristics of the electromagnetically driven valve. That is, according to the present invention, it is possible to broaden the selection range of the material forming the contact member.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an electromagnetically driven valve that is an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a first core portion included in the electromagnetically driven valve of this embodiment.

3 is a diagram of the first core portion as viewed from the lower side in FIG. 2. FIG.

FIG. 4 is an axial cross-sectional view of a sleeve included in the first core portion.

FIG. 5 is a diagram showing a state where the plunger is sucked by the first core portion.

FIG. 6 is a first diagram of the electromagnetically driven valve according to the second embodiment of the present invention.
It is sectional drawing of a core part.

[Explanation of symbols]

36 Plunger 46 Armature 48 1st core part 50 Second core part 52 core 62 sleeve

Front Page Continuation (72) Inventor Hiroyuki Hattori 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Co., Ltd. (56) References JP-A-9-112729 (JP, A) JP-A-2-212685 (JP, A) JP-A-9-53743 (JP, A) JP-A-9-32957 (JP, A) JP-A-6-176921 (JP, A) JP-A 64-6575 (JP, A) Actual development Sho-60 -184471 (JP, U) JP-B-62-4588 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16K 31/06-31/11 F01L 9/04 H01F 7/06

Claims (2)

(57) [Claims] 1. A coil formed by laminating a plurality of magnetic plates.
An electromagnet having aArmature attracted by the electromagnetic force generated by the electromagnet
And The armature is supported so as to be displaceable in the axial direction, and the armature is
A plunger that holds it so that it faces the end face of A valve body that opens and closes according to the displacement of the plunger.
When, The electromagnetOn the circumference of the coreProvided, saidArmachi
AIs attracted to the electromagnet, the plunger and
Abut,The armatureGap between the core and the core
A contact member for forming An electromagnetically driven valve comprising: 2. The electromagnetically driven valve according to claim 1, wherein The contact member is, Made of soft magnetic material, all axial direction
A tubular member having a slit over its length, The plungerIs nonBeing composed of magnetic material
Characteristic electromagnetically driven valve.