JPH10332027A - Electromagnetic drive valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability of a core, relating to an electromagnetic drive valve provided with the core having a laminated structure. SOLUTION: A core 50 is constituted by laminating a plurality of plates, formed in involute shape to have magnetism, spirally in a peripheral direction. In the core 50, an electromagnetic coil 54 is received. In an internal peripheral part of the core 50, a sleeve 62 is press fitted, its end part is protruded from an end face of the core 50. Consequently, in the case that an armature 46 is attracted to the core 50, the sleeve 62 and a plunger 36 are brought into contact, between the core 50 and the plunger 36, a prescribed gap G is formed.

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 having a magnetic core having a laminated structure.

[0002]

2. Description of the Related Art In general, 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 plunger is attracted toward the electromagnet by the electromagnetic force. Then, the valve body is driven according to the displacement of the plunger, so that the electromagnetically driven valve is opened and closed. The electromagnet includes a core made of a magnetic material and a coil housed inside the core. When the excitation state of the electromagnet changes, an eddy current is generated in the core.
The eddy current generated in the core acts to cancel the electromagnetic force generated by the electromagnet. Therefore, in order to ensure the performance of the electromagnetically driven valve, it is required to suppress the eddy current generated in the core.

As a configuration capable of reducing the eddy current generated in the core, a configuration has been conventionally known, for example, from Japanese Patent Application Laid-Open No. 6-17692.
The core disclosed in No. 1 is known. The conventional core is configured by laminating a plurality of magnetic plates in a spiral shape in the circumferential direction. According to such a configuration, the resistance to the eddy current is increased by stacking a plurality of magnetic plates in the direction of the eddy current generated in the core, that is, in the circumferential direction of the core. As a result, the eddy current generated in the core is suppressed. Is done. Therefore, by applying the above-described conventional core configuration to the electromagnet of the electromagnetically driven valve, it is possible to prevent the performance of the electromagnetically driven valve from deteriorating due to the eddy current of the core.

[0004]

When the core has a spiral laminated structure as in the above-mentioned conventional core, its strength is reduced and the core is easily 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-described conventional core configuration is applied to an electromagnet of an electromagnetically driven valve, the core is gradually deformed when an impact force is repeatedly applied to the core in accordance with the contact between the plunger and the core.
When the core is deformed, the desired characteristics of the electromagnetically driven valve cannot be obtained due to a change in the gap between the core and the plunger. As described above, if the above-described conventional core configuration is directly applied to the electromagnetically driven valve, the durability of the core is reduced.

[0005] The present invention has been made in view of the above points, and an object of the present invention is to improve the durability of an electromagnetically driven valve provided with a magnetic core having a laminated structure.

[0006]

The above object is achieved by the present invention.
As described in, an electromagnet having a core formed by laminating a plurality of plates having magnetism, a plunger attracted by an electromagnetic force generated by the electromagnet, and a valve body that opens and closes in accordance with the displacement of the plunger. , Provided in the electromagnet, in a state where the plunger is attracted by the electromagnet,
This is achieved by an electromagnetically driven valve comprising: a contact member that comes into contact with the plunger and forms a predetermined gap between the plunger and the core.

In the present invention, the core of the electromagnet is formed by laminating a plurality of magnetic plates. For this reason, the strength of the core is low, and the core is easily deformed. The contact member provided on the electromagnet contacts the plunger while the plunger is attracted by the electromagnet, and forms a gap between the plunger and the core. Therefore, according to the present invention, since the plunger does not come into contact with the core, deformation of the core is prevented.

According to a second aspect of the present invention, in the electromagnetically driven valve according to the first aspect, the contact member is made of a soft magnetic material and has a slit, and the plunger is A portion formed of a non-magnetic material at a portion that comes into contact with the contact member when attracted by the electromagnet, and a magnetic material at a portion where the predetermined gap is formed between the core and the attracted portion by the electromagnet. This is achieved more effectively by an electromagnetically driven valve made of a material.

In the present invention, the contact member is made of a soft magnetic material. Therefore, an eddy current is generated in the contact member with the operation of the electromagnetically driven valve. However, since the contact member has the slit, the eddy current is suppressed. On the other hand, the plunger is made of a magnetic material at a portion where a predetermined gap is formed between the plunger and the core while being attracted by the electromagnet. Thus, the plunger can be attracted by the electromagnet. The plunger is made of a non-magnetic material at a position where the plunger comes into contact with the contact member while being attracted to the electromagnet. For this reason, when the excitation of the electromagnet is interrupted, 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 lowering the performance of the electromagnetically driven valve.

[0010]

FIG. 1 is a structural view 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 element 12.
The valve body 12 constitutes an intake valve of the internal combustion engine. Valve body 12
Is disposed on the lower head 16 so as to be exposed inside the combustion chamber 14 of the internal combustion engine. An intake port 18 is formed in the lower head 16. The intake port 18 has a valve body 12
Is formed. Intake port 18
When the valve body 12 is separated from the valve seat 20, the conductive state is established, and when the valve body 12 is seated on the valve seat 20, the closed state is established. 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 slidably held in the axial direction by a valve guide 26. The valve guide 26 is the lower head 16
Is held in. A cylindrical portion 28 is formed in a portion of the lower head 16 surrounding a substantially upper half of the valve shaft 24. 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 for generating an urging force in a direction for separating the both is provided. The lower spring 32 urges the valve shaft 24 and the valve body 12 upward, that is, toward the valve seat 20 via the lower retainer 30.

A lower end surface of a plunger 36 is in contact with an 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 an 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 provided 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 downward through the applicator 38.

An armature holding portion 36a protruding radially outward is formed on the outer periphery of the plunger 36 at an intermediate portion in the axial direction. Around the armature holding portion 36a,
An armature 46 is joined. The armature 46 is an annular member made of a soft magnetic material. A first core portion 48 is provided above the armature 46. Further, a second core unit 50 is provided below the armature 46. The first core part 48 and the second core part 50 have the same configuration, and are arranged so as to be vertically symmetrical to each other. Hereinafter, the configuration of the first core unit 48 will be representatively described with reference to FIG.

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

When the energized state of the electromagnetic coil 54 changes,
An eddy current is generated in the core 52 in the circumferential direction. In the present embodiment, since the core 52 is formed of a magnetic plate laminated in a spiral shape in the circumferential direction, the eddy current generated in the core 52 is suppressed to be small. The core 52 is also provided with a through hole 56 that passes through the center in the axial direction. A core plate 58 is provided on the other end surface (the upper end surface in FIG. 2) of the core 52. The coablate 58 is a disk-shaped member formed with a larger diameter than the core 52. The core plate 58 has a through hole 56 of the core 52.
A through hole 60 is provided coaxially. Through hole 60
Is a large-diameter portion 60a provided on the core 52 side;
And a small-diameter portion 60b provided on the side opposite to the first portion.

The first core section 48 also has a sleeve 62. The sleeve 62 is a cylindrical 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 described later, the plunger 3 is attached to the sleeve 62.
The impact force acts upon the contact with 6. A plating layer of a high-hardness material is provided on the surface of the sleeve 62 so that abrasion hardly occurs even under 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.
And FIG. 4 shows a large diameter portion 62a of the sleeve 62.
FIG. 3 is a cross-sectional view taken 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 length of the sleeve 62 in the axial direction. As described later, the provision of the slit 62a reduces eddy current generated in the sleeve 62 when the electromagnetically driven valve is operated.

As shown in FIG. 2, the sleeve 62 has a small diameter portion 62b having a large diameter portion 60a of the through hole 60 of the core plate 58.
And the large-diameter portion 62 a is pressed into the through hole 56 of the core 52, so that the large-diameter portion 62 a is held inside the core 52. With the sleeve 62 held inside the core 52 in this manner, the end on the large-diameter portion 62a side is
Is configured to protrude from the end face 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 bonding.

Small diameter portion 6 of through hole 60 of core plate 58
A bearing 64 is provided at 0b. The bearing 64 is a sliding bearing made of a cylindrical metal member or a resin member. FIG. 5 shows that the armature 46 is the first core unit 4.
FIG. 8 shows the state of suction. As shown in FIG. 5, the plunger 36 passes through 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 protrude from the end surface of the core 52, the displacement of the plunger 36 toward the first core portion 48 is prevented by the armature holding portion 36a.
It is regulated by the contact of the sleeve 62 with the sleeve 62. For this reason, in such a situation, a predetermined gap G (for example, 0.03 to 0.03) is provided between the armature 46 and the core 52.
(A gap of about 0.1 mm) is formed.

Referring again to FIG. 1, the upper head 22
Is formed with a cylindrical portion 22a penetrating vertically. Large-diameter portions 22b and 22c having a larger diameter than the cylindrical portion 22a are formed at the upper end and the lower end of the cylindrical portion 22a, respectively. The first core portion 48 and the second core portion 50 each include a core plate 58 having a spacer 66.
And 68 are inserted into the cylindrical portion 22a until they come into contact with the bottom surfaces of the large-diameter portions 22b and 22c of the upper head 22.

Above the core plate 58 of the first core portion 48, a flange portion 42a formed at the lower end of the above-described upper cap 42 is disposed. A lower cap 70 is provided below the core plate 58 of the second core part 50.
Are arranged. Then, the fixing bolt 72 penetrates through the flange portion 42a 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. As a result, 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 inside the upper head 22 at a predetermined interval. .
Note that the above-described adjuster bolt 44 is attached to the armature 4
The neutral position of the core 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 an exciting current is supplied to the electromagnetic coil 54 of the first core 48, an electromagnetic attraction in a direction toward the first core portion 48 acts on the armature 46 by the magnetic flux generated by the electromagnetic coil 54. Therefore, the armature 46 is displaced toward the first core portion 48 against the urging force of the upper spring 40. In this case, as described above, the sleeve 62 is
Is disposed so as to protrude from the end surface of the armature 46, the displacement of the armature 46 is restricted by the armature holding portion 36 a abutting on the sleeve 62. Armature 4
In a state where the valve body 12 is displaced until it comes into contact with 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 in the state in which the electromagnetically driven valve is closed, the armature 46 is held at the valve closing side displacement end. The electromagnetic attraction required for the operation disappears. In this case, as described above, with the armature 46 held at the valve-closing-side displacement end, the gap G between the armature 46 and the core 52 is maintained.
Is formed, thereby preventing the attraction force from acting between the armature 46 and the first core 50 due to the residual magnetism inside the armature 46. Further, since the plunger 36 is made of a non-magnetic material, it is possible to prevent a suction force from acting between the armature holding portion 36a of the plunger 36 and the sleeve 62 due to residual magnetism inside the sleeve 62. . For this reason, the first core portion 48
When the supply of the exciting current to the electromagnetic coil 54 is stopped,
The plunger 36 immediately starts displacing downward by being urged by the upper spring 40.

When the plunger 36 is displaced downward from the valve-closing-side displacement end, the valve body 12 separates from the valve seat 20 to open the electromagnetically driven valve. When an exciting current is supplied to the electromagnetic coil 54 of the second core 50 at the time when the amount of downward displacement of the plunger 36 reaches a predetermined value, electromagnetic attraction for urging 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 50 against the urging force generated by the lower spring 32.
In this case, the displacement of the plunger 36 is restricted by the armature holding portion 36a abutting on 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 50
When the supply of the exciting current to the armature is stopped, the electromagnetic attraction 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 the member 6 is made of a non-magnetic material, the plunger 36 immediately 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 driven by the electromagnetic attraction generated by the electromagnetic coil 54. It is urged toward one 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, whereby the electromagnetically driven valve is again closed.

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
The electromagnetically driven valve can be opened and closed by alternately supplying an exciting current at an appropriate timing and repeatedly 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 this embodiment,
By configuring 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 is reduced at the end face, and deformation is likely to occur. In this embodiment, the core 52 is arranged so that its end face faces the armature 46. For this reason, if the armature 46 directly contacts the core 52, the impact force repeatedly acts on the end face of the core 52 with the opening and closing operation of the electromagnetically driven valve, and the core 52 gradually deforms. Further, when an impact force acts on the end face of the core 52, the laminated plate is displaced so as to be displaced in the axial direction.
2 is 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 is reduced.

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 is in contact with the sleeve 62 of the first core portion 48 or the second core portion 50. By contact, the sleeve 62
The 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 and closing operation of the electromagnetically driven valve, the core 5
No impact force acts directly on 2. Therefore, in the present embodiment, even if the opening and closing operation of the electromagnetically driven valve is repeated, deformation of the core 52 is prevented, and as a result, the durability of the core 52 is improved.

Also, 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 can be displaced with high responsiveness in accordance with on / off of the exciting current to the electromagnetic coil 54.
As described above, according to the present embodiment, since the sleeve 62 is configured to form the gap G between the core 52 and the armature 46, the advantage that the responsiveness of the electromagnetically driven valve is improved. You can also get

Since the sleeve 62 is disposed inside the core 52, the magnetic flux generated by the electromagnetic coil 52 acts on the sleeve 62 in the axial direction. Therefore, when the excitation state of the electromagnetic coil 54 changes, an eddy current is generated in the sleeve 62 in the circumferential direction. 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 desired performance of the electromagnetically driven valve, it is required to suppress eddy current generated in the sleeve 62.

On the other hand, in the present embodiment, as described with reference to FIG. 4, the sleeve 62 is provided with the slit 62a extending over the entire length in the axial direction. By providing such a slit 62a, the flow path of the eddy current circulating in the circumferential direction of the sleeve 62 is blocked.
For this reason, the length of the flow path of the eddy current is increased, and the effective resistance value to the eddy current is increased. Therefore, in the present embodiment, the eddy current generated in the sleeve 62 is suppressed to be small, thereby preventing the performance of the electromagnetically driven valve from being reduced due to the eddy current of the sleeve 62.

As described above, a plating layer of a high hardness material is provided on the surface of the sleeve 62. For this reason,
Wear caused on 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 according to a second embodiment of the present invention will be described with reference to FIG. FIG. 6 shows the first core portion 148 and the plunger 136 provided in the electromagnetically driven valve of this embodiment.
Is shown. In FIG. 6, the armature 46 is the first armature.
The state where it was sucked by the core part 148 is shown. The electromagnetically driven valve of this embodiment is the same as the first core portion 148 and the first core portion 148 shown in FIG. 6 instead of the first core portion 48 and the second core portion 50 in the first embodiment. This is realized by using a second core unit (not shown) having a configuration. 6, the same components as those in FIG. 2 are denoted 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 slidably held in the axial direction by a bearing 64 provided on the core plate 58. The plunger 136 includes an armature holding portion 136a that projects radially outward. 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 the base.

The first core portion 148 is provided with the sleeve 16.
2 is provided. The sleeve 162 is a cylindrical member made of a soft magnetic material. As in the sleeve 62 of the first embodiment, the sleeve 162 is provided with a slit extending over the entire length in the axial direction. 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 is formed in the through hole 60 of the core plate 58.
The large diameter portion 162a is press-fitted into the through hole 56 of the core 52 while the large diameter portion 60a is press-fitted into the large diameter portion 60a.
2 are held inside. A conical abutment 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 this 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 sucked by the first core portion 148. Core 5
A predetermined gap G is formed between the armature 2 and the armature 46. Therefore, also in the present embodiment, similarly to the first embodiment, the armature 46 is prevented from coming into contact with the core 52 with the opening / closing operation of the electromagnetically driven valve, whereby the durability of the core 52 is reduced. Has been improved.

The armature 46 is connected to the first core 148
A predetermined gap is formed between the core 52 and the armature 46 in a state where the plunger 46 is sucked.
Of the core 52 and the plunger 46 due to the residual magnetism. Therefore, also in the present embodiment, an electromagnetically driven valve having excellent responsiveness is realized as in the first embodiment.

In the first and second embodiments, the sleeves 62 and 162 are arranged on the inner periphery of the core 52. However, the present invention is not limited to this. The core 162 may be provided at the outer peripheral portion of the core 52 or at an intermediate portion between the inner periphery and the outer periphery. That is, in the first embodiment, any position of the core 52 can be used if the sleeve 62 is configured to protrude from the end face of the core 52 to prevent the core 52 from contacting the armature 46 and the plunger 36. May be arranged.
In the second embodiment, a projection is provided on the plunger 136 or the armature 46 to project toward the core 52 in accordance with the position of the sleeve 162, and the projection is brought into contact with the sleeve 162. 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 are made of a sleeve. The sleeve 62, 162
162, a reduction in the responsiveness of the electromagnetically driven valve due to the residual magnetism is prevented. However, the present invention is not limited to this, and the sleeves 62 and 162 may be made of a non-magnetic material. Sleeve 62, 1
When the sleeve 62 is made of a non-magnetic material, the sleeve 62,
Since no residual magnetism is generated in the plunger 162, the plunger 36 and the armature 46 can be integrally formed of a soft magnetic material. When the sleeves 62 and 162 are made of a non-magnetic material, no eddy current is generated in the sleeves 62 and 162, so that it is unnecessary to provide the sleeves 62 and 162 with the slits 62a.

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 durability of the core can be improved while ensuring the performance of the electromagnetically driven valve. . Therefore, according to the above embodiment, the constituent materials of the sleeves 62 and 162 are not limited to soft magnetic materials, and can be selected from a wider range of materials.

Further, if the sleeves 62 and 162 are made of, for example, non-magnetic high hardness type steel (for example, HPM75 made by Hitachi Metals), the conditions (for example, 700 to 800 ° C.) for performing the annealing treatment of the core 52 can be used. Vacuum annealing), the sleeve 62 can be simultaneously cured. Therefore, in this case, it is not necessary to apply a plating process to the surface of the sleeve 62 in order to improve the wear resistance, 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 configuration including a core having a laminated structure.
In the first and second embodiments, the sleeve 6
The contact members 2 and 162 include the plungers 36 and 1
The armature 46 and the armature 46 correspond to the above-described plunger, and the core 52 and the electromagnetic coil 54 correspond to the above-described electromagnet.

[0042]

As described above, according to the first aspect of the present invention, it is possible to prevent the plunger from contacting the core. Therefore, according to the present invention, the durability of the core can be improved. According to the second aspect of the present 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, the range of selection of the material forming the contact member can be expanded.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an electromagnetically driven valve according to 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 the present embodiment.

FIG. 3 is a view of a first core portion viewed from a lower side in FIG. 2;

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

FIG. 5 is a diagram showing a state in which a plunger is sucked into a first core portion.

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

[Description of Signs] 36 Plunger 46 Armature 48 First Core 50 Second Core 52 Core 62 Sleeve

Continued on the front page (72) Inventor Hiroyuki Hattori 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation

Claims (2)

[Claims] An electromagnet having a core formed by laminating a plurality of plates having magnetism; a plunger attracted by an electromagnetic force generated by the electromagnet; and a valve body that opens and closes in response to displacement of the plunger. A contact member provided on the electromagnet, the plunger being in contact with the plunger in a state where the plunger is attracted to the electromagnet, and forming a predetermined gap between the plunger and the core. And an electromagnetically driven valve. 2. The electromagnetically driven valve according to claim 1, wherein the contact member is made of a soft magnetic material and has a slit, and the plunger is attracted by the electromagnet while the contact member is in a state of being attracted by the electromagnet. And a part where the predetermined gap is formed between the core and the core when attracted by the electromagnet. valve.