JP2007309259A - Solenoid-driven valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solenoid-driven valve capable of improving silence. <P>SOLUTION: This solenoid-driven valve has a disk 21 for driving the valve and an electromagnet 51m. The disk 21 includes a first portion 26 and second portions 27, 28. The electromagnet 51m is arranged so as to oppose to the disk 21 and includes a core part 52 attracting the disk 21. The electromagnet 51m forms a magnetic flux flow passing through the core part 52 and the disk 21 and applies electromagnetic force to the disk 21. On the disk 21, notches are formed such that magnetic circuit areas in the second portions 27, 28 become smaller than that in the first potion 26. Assuming that the disk 21 has no notch formed thereon, the magnetic flux flow formed on the disk 21 has relatively large magnetic flux density in the first portion 26 and relatively small magnetic flux density in the second portions 27, 28. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention generally relates to an electromagnetically driven valve, and more particularly to an electromagnetically driven valve that constitutes an engine valve of an internal combustion engine such as a gasoline engine or a diesel engine mounted on a vehicle.

  Regarding a conventional electromagnetically driven valve, for example, US Pat. No. 6,467,441 discloses an electromagnetic actuator in which a valve of an internal combustion engine operates by cooperation of electromagnetic force and elastic force of a spring (Patent Document 1). . The electromagnetic actuator disclosed in Patent Document 1 includes a valve having a stem and a swing arm. The swing arm is swingably supported by the support frame and has a first end portion formed in a cylindrical shape and a second end portion in contact with the tip end of the stem. An electromagnet including a core and a coil wound around the core is disposed above and below the swing arm.

  The electromagnetic actuator is provided at the first end of the swing arm, and a torsion bar that biases the valve toward the open state, and a spiral spring that is disposed on the outer periphery of the stem and biases the valve toward the closed state. Is further provided. The swing arm is alternately attracted to the cores of the electromagnets arranged above and below by the electromagnetic force generated by the electromagnet and the elastic force of the torsion bar and the spiral spring.

  Japanese Patent Laid-Open No. 2003-83015 discloses a valve drive device for an internal combustion engine that aims to reduce the space for power distribution while eliminating overheating of the wiring (Patent Document 2). Japanese Laid-Open Patent Publication No. 10-1441028 discloses an electromagnetically driven valve mechanism for an internal combustion engine for the purpose of stabilizing seating control and reducing impact when the plunger is seated on an electromagnet ( Patent Document 3).

Japanese Patent Application Laid-Open No. 2003-33674 discloses a cutter for a bag breaker for the purpose of suppressing a collision noise between the cutter and waste (Patent Document 4). In addition, German Patent Application No. 19608061 discloses an electromagnetic valve including an armature that operates between a valve opening position and a valve closing position (Patent Document 5).
US Pat. No. 6,467,441 JP 2003-83015 A JP-A-10-1441028 JP 2003-33674 A German Patent Application Publication No. 19608061

  In the electromagnetic actuator disclosed in Patent Document 1 described above, a magnetic flux flow is formed through the electromagnet core and the swing arm, and an electromagnetic force is generated that pulls the swing arm toward the electromagnet core. At this time, it is necessary to secure the magnetic path area of the swing arm so as not to cause magnetic saturation inside the swing arm. On the other hand, if the thickness of the swing arm is increased in order to secure the magnetic path area, the weight of the swing arm increases. For this reason, the hitting sound when the swing arm is seated on the core of the electromagnet increases, and the silence of the electromagnetic actuator may be impaired. Further, there are concerns that the responsiveness of the electromagnetic actuator is deteriorated and that the impact applied to the swing arm and the core of the electromagnet is increased, resulting in a decrease in durability.

  Accordingly, an object of the present invention is to solve the above-described problems and to provide an electromagnetically driven valve that can improve quietness.

  An electromagnetically driven valve according to one aspect of the present invention operates by cooperation of electromagnetic force and elastic force. The electromagnetically driven valve includes an armature that drives the valve and an electromagnet. The armature includes a first part and a second part. The electromagnet is disposed to face the armature and includes a core portion that attracts the armature. The electromagnet forms a magnetic flux flow through the core portion and the armature, and applies an electromagnetic force to the armature. The armature is notched so that the magnetic path area at the second part is smaller than the magnetic path area at the first part. Assuming an armature in which notches are not formed, the magnetic flux flow formed in the armature has a relatively large magnetic flux density at the first portion and a relatively small magnetic flux density at the second portion.

  According to the electromagnetically driven valve thus configured, in the armature in which the magnetic flux flow is dense and dense, the magnetic path area of the second part where the magnetic flux flow is sparse is the magnetic path area of the first part where the magnetic flux flow is dense. A notch is formed so as to be smaller. As a result, the weight of the armature can be reduced without causing magnetic saturation inside the armature. As a result, it is possible to reduce the hitting sound generated when the armature is attracted to the core portion, and to improve the quietness of the electromagnetically driven valve.

  Preferably, the electromagnet further includes a coil wound around the core portion. When the magnetic flux flow passing through the core portion and the armature is formed so as to circulate around the coil, the armature includes the first portion at a position facing the coil, and is shifted from the position facing the coil. Includes a second site. According to the electromagnetically driven valve configured as described above, a region where the magnetic flux flow is dense is included at a position facing the coil, and a region where the magnetic flux flow is sparse is included at a position shifted from the position facing the coil. .

  An electromagnetically driven valve according to another aspect of the present invention operates by cooperation of electromagnetic force and elastic force. The electromagnetically driven valve includes an armature that drives the valve, an electromagnet that applies an electromagnetic force to the armature, and a support member that supports the electromagnet. The electromagnet is disposed to face the armature, and includes a core portion that draws the armature and a seat portion that fixes the core portion to the support member. The seat has a shape that can be elastically deformed.

  According to the electromagnetically driven valve configured as described above, an impact generated when the armature is attracted to the core portion can be absorbed by the elastic deformation of the seat portion. Thereby, the hitting sound between the armature and the core portion can be reduced, and the silence of the electromagnetically driven valve can be improved.

  Preferably, the armature includes a support portion rotatably supported and a connection portion connected to the valve. The armature reciprocates the valve by rotating around the support portion. According to the electromagnetically driven valve configured as described above, any of the above-described effects can be obtained in the rotationally driven electromagnetically driven valve that reciprocates the valve by rotating the armature.

Further, the electromagnetic torque T acting on the armature at a position away from the support portion by the distance L is
T = (B ² S / μ ₀ ) × L
B: Magnetic flux density of magnetic flux flow at the above position S: Magnetic path area at the above position μ ₀ : Expressed by air permeability. Preferably, the shape of the core portion is determined so that the electromagnetic torque T derived from the above formula has a maximum value. According to the electromagnetically driven valve configured as described above, the shape of the core portion is determined so that the electromagnetic torque T acting on the armature becomes the maximum value in consideration of the increase in the magnetic flux density caused by the magnetic saturation. Thereby, an electromagnetically driven valve capable of obtaining a sufficiently large driving force can be realized.

  Preferably, the core portion has a suction surface facing the armature. The armature further includes a surface facing the suction surface and an end surface that is continuous from the surface and does not face the suction surface. The core portion further has a protruding portion that protrudes from the adsorption surface and is disposed with a gap between the core portion and the end surface.

  According to the electromagnetically driven valve configured as described above, when the armature attracted to the core part is detached from the core part, a counter electromotive force is generated to attract the armature to the core part. On the other hand, by providing a protrusion on the core part, when the armature is detached from the core part, a magnetic flux flow is formed through the core part, the armature and the protrusion part, and the occurrence of a back electromotive current is suppressed. Therefore, by adjusting the size of the gap between the end face and the protrusion, it is possible to appropriately control the movement of the armature that separates from the core.

  Preferably, the electromagnetically driven valve further includes a torsion bar that is provided in the support portion and applies an elastic force to the armature. The armature is formed from spring steel. A torsion bar and an armature are integrally formed. According to the electromagnetically driven valve configured as described above, the manufacturing cost of the electromagnetically driven valve can be suppressed through the reduction of the number of parts.

  Preferably, the core part is formed from spring steel. According to the electromagnetically driven valve configured as described above, an impact generated when the armature is attracted to the core portion can be absorbed from the core portion formed of spring steel. Thereby, the silence of an electromagnetically driven valve can be improved more effectively.

  Preferably, the core portion has a suction surface that faces the armature and repeatedly collides with the armature. The adsorption surface is subjected to heat treatment. According to the electromagnetically driven valve configured as described above, the adsorption surface of the core portion can be cured by heat treatment, and the wear resistance of the core portion can be improved.

  Preferably, the armature is made of spring steel. The armature includes a surface that faces the core portion and repeatedly collides with the core portion. The surface is heat-treated. According to the electromagnetically driven valve configured as described above, the surface of the armature can be hardened by heat treatment, and the wear resistance of the armature can be improved.

  As described above, according to the present invention, it is possible to provide an electromagnetically driven valve that can improve quietness.

  Embodiments of the present invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are denoted by the same reference numerals.

(Embodiment 1)
1 is a cross-sectional view showing an electromagnetically driven valve according to Embodiment 1 of the present invention. The electromagnetically driven valve in the present embodiment constitutes an engine valve (intake valve or exhaust valve) of an internal combustion engine such as a gasoline engine or a diesel engine mounted on a vehicle. Although the case where the electromagnetically driven valve constitutes an exhaust valve will be described in the present embodiment, the electromagnetically driven valve has a similar structure even when the intake valve is constituted.

  Referring to FIG. 1, an electromagnetically driven valve 10 is a rotationally driven electromagnetically driven valve that is driven by cooperation of electromagnetic force and elastic force.

  The electromagnetically driven valve 10 includes a valve 14 including a stem 11 extending in one direction, a disk 21 that swings around a central axis 25 by an applied electromagnetic force and elastic force, and an electromagnet that applies an electromagnetic force to the disk 21. 51m and 51n, and a torsion bar 31 for applying an elastic force to the disk 21. The valve 14 reciprocates in the direction in which the stem 11 extends (the direction indicated by the arrow 101) in response to the swinging motion of the disk 21.

  The valve 14 is mounted on a cylinder head 18 in which an exhaust port 16 is formed. A valve seat 19 is provided at a position communicating with the combustion chamber 17 from the exhaust port 16. The valve 14 further includes an umbrella portion 12 formed at the tip of the stem 11. As the valve 14 reciprocates, the umbrella portion 12 is brought into close contact with the valve seat 19 or detached from the valve seat 19, whereby the exhaust port 16 is opened and closed. In the present embodiment, when the stem 11 is raised, the valve 14 is positioned to the valve closing position, and when the stem 11 is lowered, the valve 14 is positioned to the valve opening position.

  The electromagnetically driven valve 10 is provided with valve guides 41 and 42 for guiding the stem 11 so as to be slidable in the axial direction. The valve guides 41 and 42 are made of, for example, a metal such as stainless steel so as to withstand high-speed sliding with the stem 11.

  A lower spring 43 is supported on the outer periphery of the stem 11 by a bowl-shaped lower retainer 44. The lower spring 43 is formed of a coil spring. The lower spring 43 applies an elastic force in the direction in which the stem 11 is raised to the valve 14.

  FIG. 2 is a perspective view showing the electromagnet in FIG. With reference to FIGS. 1 and 2, a support base 48 is fixed on the top surface of the cylinder head 18. The support base 48 supports electromagnets 51m and 51n. The electromagnet 51m and the electromagnet 51n are arranged above and below the disk 21, respectively.

  The electromagnet 51 m includes a coil 53 and a core part 52. The core part 52 has a substantially E-shaped cross-sectional shape when cut by a plane orthogonal to the central axis 25. The core portion 52 includes a base portion 52g and a first extending portion 52k, a second extending portion 52h, and a third extending portion 52j that are provided at an interval from each other and extend from the base portion 52g toward the disk 21. The distance between the first extending portion 52k and the central axis 25 is greater than the distance between the third extending portion 52j and the central axis 25. The distance between the second extending portion 52h and the central axis 25 is smaller than the distance between the first extending portion 52k and the central axis 25, and is smaller than the distance between the third extending portion 52j and the central axis 25. large. The coil 53 is wound around the second extending portion 52h. The length of the core portion 52 in the direction along the central axis 25, that is, the depth of the core portion 52 is constant. The electromagnet 51n has the same shape as the electromagnet 51m.

  The core portion 52 of the electromagnet 51 m has an attracting surface 52 m that faces the disk 21. The core portion 52 of the electromagnet 51 n has an attracting surface 52 n that faces the disk 21. A space in which the disk 21 swings is formed between the suction surface 52m and the suction surface 52n.

  The core part 52 is formed from a magnetic material, and in this embodiment, is formed from a plurality of laminated electromagnetic steel sheets. The core portion 52 may be formed of a magnetic material other than the electromagnetic steel plate, for example, a green compact of magnetic powder. The coil 53 of the electromagnet 51m and the coil 53 of the electromagnet 51n may be formed from a single continuous coil wire or may be formed from separate coil wires.

  FIG. 3 is a perspective view showing the disk in FIG. With reference to FIGS. 1 and 3, the disk 21 is further supported on the support base 48. The disk 21 is made of a magnetic material. The disk 21 includes a support portion 23 and a connecting portion 22. A central axis 25 is defined in the support portion 23. The disk 21 extends in a direction intersecting the stem 11 from the support portion 23 toward the connecting portion 22.

  The disk 21 includes a surface 21a facing the suction surface 52m and a surface 21b facing the suction surface 52n. The surfaces 21 a and 21 b are formed between the support portion 23 and the connecting portion 22.

  A through hole 24 is formed in the support portion 23. A torsion bar 31 is press-fitted into the through hole 24. The torsion bar 31 extends along the central axis 25. The support portion 23 is rotatably supported by the support base 48 via the torsion bar 31. The connecting portion 22 is connected to the tip 11c of the stem 11 opposite to the tip on which the umbrella portion 12 is formed.

  The torsion bar 31 applies an elastic force to the disk 21 in a direction to rotate counterclockwise about the central axis 25. That is, the torsion bar 31 applies an elastic force to the valve 14 in the direction of lowering the stem 11 via the disk 21. With no electromagnetic force acting on the disc 21, the disc 21 is positioned at an intermediate position between the swing end on the valve opening side and the swing end on the valve closing side by the elastic force of the lower spring 43 and the torsion bar 31. Is done.

  When a current is supplied to the coil 53 of the electromagnet 51m, a magnetic flux flow passing through the core portion 52 of the electromagnet 51m and the disk 21 is formed. As a result, the electromagnet 51m generates an electromagnetic force that attracts the disk 21 to the attracting surface 52m. Further, when a current is supplied to the coil 53 of the electromagnet 51n, a magnetic flux flow passing through the core portion 52 of the electromagnet 51n and the disk 21 is formed. As a result, the electromagnet 51n generates an electromagnetic force that attracts the disk 21 to the attracting surface 52n.

  With such a configuration, the disk 21 is swung around the central axis 25 by the electromagnetic force generated by the electromagnets 51m and 51n and the elastic force of the lower spring 43 and the torsion bar 31, and the valve 14 is reciprocated. When the disk 21 is attracted to the suction surface 52m, the stem 11 is raised and the valve 14 is positioned to the valve closing position. When the disk 21 is attracted to the suction surface 52n, the stem 11 is lowered and the valve 14 is positioned to the valve opening position.

  FIG. 4 is a cross-sectional view showing the magnetic flux flow formed in the disk and the core portion in FIG. In the figure, the disk 21 attracted to the electromagnet 51m is shown. In the following, only the electromagnet 51m will be described as a representative, but the same applies to the electromagnet 51n.

  3 and 4, when the disk 21 is attracted to the electromagnet 51m, a current is supplied to the coil 53, whereby a magnetic flux flow is formed between the core portion 52 and the disk 21. The magnetic flux circulates around the coil 53 while flowing through an annular path constituted by the base 52g, the second extending portion 52h, the disk 21 and the first extending portion 52k. The magnetic flux circulates around the coil 53 while flowing through an annular path constituted by the base 52g, the second extending portion 52h, the disk 21, and the third extending portion 52j.

  The disk 21 includes a first portion 26 and second portions 27 and 28. The first part 26 and the second parts 27 and 28 are provided at positions separated from each other by a different distance from the central axis 25. The disk 21 includes a first portion 26 at a position facing the coil 53 and includes second portions 27 and 28 at positions shifted from the position facing the coil 53. The disk 21 includes a second portion 28 at a position facing the first extending portion 52k, and includes a second portion 27 at a position facing the second extending portion 52h.

  The distance between the central axis 25 and the second part 28 is larger than the distance between the central axis 25 and the second part 27. The distance between the central axis 25 and the first part 26 is smaller than the distance between the central axis 25 and the second part 28 and larger than the distance between the central axis 25 and the second part 27. The second portion 28 is provided adjacent to the connecting portion 22. A second part 27 and a second part 28 are provided on both sides of the first part 26.

  The disc 21 is formed with a notch so that the magnetic path areas S2 and S3 in the second portions 27 and 28 are smaller than the magnetic path area S1 in the first portion 26. The magnetic path areas S <b> 1 to S <b> 3 are cross-sectional areas of the disk 21 when cut along a plane orthogonal to the direction from the support portion 23 toward the coupling portion 22. When the length between the surface 21a and the surface 21b is called the thickness T of the disk 21, the disk 21 has a thickness at the second portions 27 and 28 that is smaller than the thickness at the first portion 26. A notch is formed.

  By forming the notches, the surfaces 21a and 21b do not extend on the same plane. Each of the surfaces 21 a and 21 b extends while being bent from the support portion 23 toward the connection portion 22. Each of the surfaces 21 a and 21 b may extend while being curved from the support portion 23 toward the connection portion 22.

  FIG. 5 is a cross-sectional view showing the shape of the disc when notches are not formed. Referring to FIG. 5, when assuming a disk 21y having a shape in which notches are not formed in disk 21 in FIG. 4, surfaces 21a and 21b each extend on the same plane. The thickness T of the disk 21 monotonously decreases from the support portion 23 toward the connecting portion 22. When the notch is not formed, the magnetic path area in the first portion 26 is S1. The magnetic path area S4 in the second part 27 is larger than the magnetic path area S1 in the first part 26. The magnetic path area S1 in the first part 26 is larger than the magnetic path area S5 in the second part 28.

  When a magnetic flux flow is formed on the disk 21y having such a shape, the magnetic flux flow has a relatively large magnetic flux density at the first portion 26 and a relatively small magnetic flux density at the second portions 27 and 28. Have In the present embodiment, notches are formed in the disk 21y so as to reduce the magnetic path areas S4 and S5 in the second portions 27 and 28, and the disk 21 in FIG. 4 is obtained. Thereby, the weight of the disk 21 can be reduced without causing magnetic saturation inside the disk 21.

  The electromagnetically driven valve 10 according to the first embodiment of the present invention includes a disk 21 as an armature for driving the valve 14 and electromagnets 51m and 51n. The disk 21 includes a first portion 26 and second portions 27 and 28. The electromagnets 51m and 51n are disposed to face the disk 21 and include a core portion 52 that draws the disk 21. The electromagnets 51m and 51n form a magnetic flux flow passing through the core portion 52 and the disk 21 and apply an electromagnetic force to the disk 21. The disk 21 is formed with a notch so that the magnetic path areas S2 and S3 in the second portions 27 and 28 are smaller than the magnetic path area S1 in the first portion 26. Assuming a disk 21y in which notches are not formed, the magnetic flux flow formed on the disk 21y has a relatively large magnetic flux density at the first portion 26 and a relatively small magnetic flux at the second portions 27 and 28. Has a density.

  The disk 21 includes surfaces 21 a and 21 b that face the core portion 52 and repeat collision with the core portion 52. In the disk 21y in which notches are not formed, the surfaces 21a and 21b each extend on the same plane. In the disk 21 in which the cutout is formed, the surfaces 21a and 21b do not extend on the same plane.

  According to the electromagnetically driven valve 10 according to Embodiment 1 of the present invention configured as described above, it is possible to reduce the hitting sound between the disk 21 and the core portion 52 by reducing the weight of the disk 21. Thereby, the silence of the electromagnetically driven valve 10 can be improved. In addition, power consumption and transition time can be reduced, and durability can be improved. In particular, in the present embodiment, since the second portions 27 and 28 are set at positions far from the central axis 25 that is the rotation center of the disk 21, these effects can be obtained more effectively.

(Embodiment 2)
The electromagnetically driven valve according to the second embodiment of the present invention basically has the same structure as the electromagnetically driven valve according to the first embodiment. Hereinafter, the description of the overlapping structure will not be repeated.

FIG. 6 is a graph showing the relationship between the magnetic path width of the core portion, the magnetic flux density, and the electromagnetic torque. 4 and 6, the electromagnetic torque acting on the disk 21 at a position away from the central axis 25 by a distance L is T, the magnetic flux density at that position is B, the magnetic path area is S, and the air permeability is When μ ₀ is set, the electromagnetic torque T is
T = (B ² S / μ ₀ ) × L
It is expressed by the following formula.

  If the depth of the core part 52 is constant, the magnetic path area S and the magnetic path width D of the core part 52 have a proportional relationship. In this case, in order to apply a larger electromagnetic torque to the disk 21, it is necessary to increase the magnetic flux density B and the magnetic path width D. As the magnetic path width D is decreased, the magnetic flux density B increases, but as the magnetic saturation approaches, the rate of increase of the magnetic flux density B decreases. For this reason, the magnetic path width Db that maximizes the electromagnetic torque T is obtained from the above equation. In the present embodiment, the magnetic path width Db calculated from the above equation is the width dimension of the core portion 52 at a position away from the central axis 25 by the distance L.

  According to the electromagnetically driven valve according to the second embodiment of the present invention configured as described above, the effects described in the first embodiment can be similarly obtained. In addition, a larger electromagnetic force can be applied to the disk 21 by setting the magnetic path width and magnetic path position of the core portion 52 to optimum values. In addition, the power consumed by the electromagnets 51m and 51n can be reduced.

(Embodiment 3)
7 and 8 are cross-sectional views showing an electromagnetically driven valve according to Embodiment 3 of the present invention. FIG. 7 shows the disk 21 drawn to the suction surface 52m. FIG. 8 shows the disk 21 to be detached from the suction surface 52m. The electromagnetically driven valve in the present embodiment basically has the same structure as that of the electromagnetically driven valve 10 in the first embodiment. Hereinafter, the description of the overlapping structure will not be repeated.

  Referring to FIG. 7, disk 21 further includes an end surface 21c. The end face 21c does not face the suction faces 52m and 52n. The end surface 21c continues from the surface 21a. The end surface 21c extends between the surface 21a and the surface 21b. The end surface 21 c is provided on the front end side of the disk 21 that extends from the support portion 23 toward the connecting portion 22.

  In the present embodiment, core portion 52 further includes a protrusion 56. The protrusion 56 is provided so as to protrude from the suction surface 52m. The protrusion 56 is disposed with a gap from the end surface 21c. The protruding portion 56 is provided adjacent to the first extending portion 52k.

  For comparison, FIG. 9 is a cross-sectional view showing the magnetic flux flow formed in the disk and the core when no protrusion is provided on the core. FIG. 9 shows the disk 21 to be detached from the suction surface 52m.

  Referring to FIG. 9, when the disk 21 is about to be detached from the suction surface 52 m, a counter electromotive current flows inside the disk 21 and the core portion 52. The counter electromotive force generates a counter electromotive force that attracts the disk 21 to the suction surface 52m, and prevents the disk 21 from moving away from the suction surface 52m.

  Referring to FIG. 8, in the present embodiment, by providing a protrusion 56 on the core 52, when the disk 21 is about to be detached from the suction surface 52m, the base 52g and the second extension are formed around the coil 53. An annular magnetic circuit composed of the portion 52h, the disk 21, the protruding portion 56, and the first extending portion 52k is formed. Thereby, generation | occurrence | production of a counter electromotive current is suppressed.

  FIG. 10 is a graph showing the relationship between the size of the gap between the end face and the protrusion, the electromagnetic force, and the counter electromotive current. Referring to FIG. 10, the smaller the size X of the gap between the end surface 21 c and the protrusion 56, the more the generation of the back electromotive current is suppressed. On the other hand, if the size X of the gap is small in the state where the disk 21 shown in FIG. 7 is attracted to the suction surface 52m, the disk 21 is caused by the magnetic flux leaking from the disk 21 toward the protrusion 56. The electromagnetic force F attracted to the adsorption surface 52m is reduced. Considering these points, the size of the gap is determined.

  According to the electromagnetically driven valve in the third embodiment of the present invention configured as described above, the effect described in the first embodiment can be obtained in the same manner. In addition, the size of the gap can be set within a range where the back electromotive force is allowed, and the controllability at the initial stage of the swing of the disk 21 can be improved.

(Embodiment 4)
FIG. 11 is a sectional view showing an electromagnetically driven valve according to Embodiment 4 of the present invention. FIG. 11 shows a cross-sectional shape of the disk 21 corresponding to a position along the line XI-XI in FIG. FIG. 12 is a perspective view showing the disk at a position surrounded by a two-dot chain line XII in FIG. The electromagnetically driven valve in the present embodiment basically has the same structure as that of the electromagnetically driven valve described in the first embodiment. Hereinafter, the description of the overlapping structure will not be repeated.

  Referring to FIGS. 11 and 12, in the present embodiment, disk 21 is formed of spring steel. The disk 21 and the torsion bar 31 are integrally formed.

  A rotation stop block 37 is attached to the support base 48. The support part 23 has a cylindrical shape. The support portion 23 is rotatably supported by a support base 48 via a bearing 36. The torsion bar 31 includes a rotation end 31p connected to the support portion 23, and a fixed end 31q fixed to the rotation stop block 37.

  According to the electromagnetically driven valve according to the fourth embodiment of the present invention configured as described above, the same effects as those described in the first embodiment can be obtained. In addition, by forming the torsion bar 31 integrally with the disk 21, the cost of parts can be reduced. Further, the process of joining the torsion bar 31 to the disk 21 becomes unnecessary, so that the assembly cost can be reduced.

(Embodiment 5)
FIG. 13 is a cross-sectional view showing an electromagnetically driven valve according to Embodiment 5 of the present invention. The electromagnetically driven valve in the present embodiment basically has the same structure as that of the electromagnetically driven valve 10 in the first embodiment. Hereinafter, the description of the overlapping structure will not be repeated.

Referring to FIG. 13, in the present embodiment, core portion 52 is formed of spring steel.
According to the electromagnetically driven valve in the fifth embodiment of the present invention configured as described above, the effects described in the first embodiment can be obtained in the same manner. In addition, the impact when the disk 21 collides with the core portion 52 can be absorbed by the entire core portion 52. Thereby, the silence of the electromagnetically driven valve 10 can be further improved.

  The adsorption surfaces 52m and 52n of the core portion 52 formed of spring steel may be subjected to heat treatment such as quenching. Further, the disk 21 may be formed from spring steel. Heat treatment such as quenching may be applied to the surfaces 21a and 21b of the disk 21 formed of spring steel. In these cases, the adsorption surfaces 52m and 52n or the surfaces 21a and 21b can be cured, and the wear resistance and durability of the core portion 52 or the disk 21 can be improved.

(Embodiment 6)
FIG. 14 is a sectional view showing an electromagnetically driven valve according to Embodiment 6 of the present invention. Hereinafter, the description of the same structure as that of the electromagnetically driven valve 10 according to Embodiment 1 will not be repeated.

  Referring to FIG. 14, in the present embodiment, electromagnet 51 m includes a seat portion 54. The seat portion 54 is provided integrally with the core portion 52. The seat portion 54 may be provided separately from the core portion 52 and attached to the core portion 52. The seat portion 54 is fixed to the support base 48 with bolts 55. The seat portion 54 is formed so as to provide a gap 60 between the core portion 52 and the support base 48. The seat portion 54 is subjected to heat treatment such as annealing. With such a configuration, the seat portion 54 is elastically deformed so as to reduce the size of the gap 60 when the disk 21 collides with the core portion 52.

  The electromagnetically driven valve according to the sixth embodiment of the present invention includes a disk 21 as an armature for driving the valve 14, electromagnets 51m and 51n for applying an electromagnetic force to the disk 21, and a support member for supporting the electromagnets 51m and 51n. And a support base 48. The electromagnets 51m and 51n are disposed to face the disk 21 and include a core part 52 that draws the disk 21 and a seat part 54 that fixes the core part 52 to the support base 48. The seat part 54 has an elastically deformable shape.

  According to the electromagnetically driven valve according to the sixth embodiment of the present invention configured as described above, the impact when the disk 21 collides with the suction surface 52m can be absorbed by the elastic deformation of the seat portion 54. . Thereby, the silence of the electromagnetically driven valve 10 can be improved.

  In the electromagnetically driven valve in the present embodiment, the notch described in the first embodiment may not be formed in the disk 21. Further, the structure of the electromagnetically driven valve described in the second to fifth embodiments may be applied to the electromagnetically driven valve in the present embodiment. In addition, the structure of the electromagnetically driven valve in the first to sixth embodiments is not limited to the rotationally driven electromagnetically driven valve, but is appropriately applied to a translationally driven electromagnetically driven valve that drives the valve by linear motion obtained by electromagnetic force. Applied.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is sectional drawing which shows the electromagnetically driven valve in Embodiment 1 of this invention. It is a perspective view which shows the electromagnet in FIG. It is a perspective view which shows the disk in FIG. It is sectional drawing which shows the magnetic flux flow formed in the disk and core part in FIG. It is sectional drawing which shows the shape of the disc in case the notch is not formed. It is a graph which shows the relationship between the magnetic path width of a core part, magnetic flux density, and electromagnetic torque. It is sectional drawing which shows the electromagnetically driven valve in Embodiment 3 of this invention, and is a figure which shows the disk attracted | sucked to the adsorption surface. It is sectional drawing which shows the electromagnetically driven valve in Embodiment 3 of this invention, and is a figure which shows the disk which is going to detach | leave from an adsorption surface. It is sectional drawing which shows the magnetic flux flow formed in a disk and a core part when a projection part is not provided in a core part for a comparison. It is a graph which shows the relationship between the magnitude | size of the clearance gap between an end surface and a projection part, an electromagnetic force, and a counter electromotive current. It is sectional drawing which shows the electromagnetically driven valve in Embodiment 4 of this invention. It is a perspective view which shows the disk of the position enclosed with the dashed-two dotted line XII in FIG. It is sectional drawing which shows the electromagnetically driven valve in Embodiment 5 of this invention. It is sectional drawing which shows the electromagnetically driven valve in Embodiment 6 of this invention.

Explanation of symbols

  10 Electromagnetically driven valve, 14 valve, 21 and 21y disc, 21a and 21b surface, 21c end surface, 22 connecting portion, 23 support portion, 26 first portion, 27 and 28 second portion, 31 torsion bar, 48 support base, 51 m , 51n Electromagnet, 52 core part, 52m, 52n adsorption surface, 53 coil, 54 seat part, 56 projection part.

Claims (10)

An electromagnetically driven valve that operates in cooperation with electromagnetic force and elastic force,
An armature that includes a first part and a second part and drives the valve;
An electromagnet disposed opposite to the armature, including a core portion that attracts the armature, forming a magnetic flux flow through the core portion and the armature, and applying an electromagnetic force to the armature;
A cutout is formed in the armature such that the magnetic path area in the second part is smaller than the magnetic path area in the first part,
Assuming the armature in which the notch is not formed, the magnetic flux flow formed in the armature has a relatively large magnetic flux density at the first portion and a relatively small magnetic flux density at the second portion. Having an electromagnetically driven valve. The electromagnet further includes a coil wound around the core portion,
When the magnetic flux flow passing through the core and the armature is formed so as to circulate around the coil, the armature includes the first portion at a position facing the coil, and faces the coil. 2. The electromagnetically driven valve according to claim 1, wherein the second portion is included at a position shifted from a position to be operated. An electromagnetically driven valve that operates in cooperation with electromagnetic force and elastic force,
An armature that drives the valve;
An electromagnet that applies electromagnetic force to the armature;
A support member for supporting the electromagnet,
The electromagnet is disposed to face the armature, and includes a core part that draws the armature, and a seat part that fixes the core part to the support member,
The said seat part is an electromagnetically driven valve which has a shape which can be elastically deformed.   The armature includes a support part rotatably supported and a connection part connected to the valve, and reciprocates the valve by rotating around the support part. The electromagnetically driven valve according to any one of the above. The electromagnetic torque T acting on the armature at a position separated from the support by a distance L is:
T = (B ² S / μ ₀ ) × L
B: Magnetic flux density of the magnetic flux flow at the position S: Magnetic path area at the position μ ₀ : Permeability of air
The shape of the said core part is an electromagnetically driven valve of Claim 4 determined so that the electromagnetic torque T derived | led-out from the said formula may become the maximum value. The core portion has a suction surface facing the armature,
The armature further includes a surface that faces the suction surface, and an end surface that continues from the surface and does not face the suction surface;
6. The electromagnetically driven valve according to claim 4, wherein the core portion further includes a protruding portion that protrudes from the adsorption surface and is provided with a gap between the core portion and the end surface. Further provided with a torsion bar provided on the support portion and applying an elastic force to the armature;
The electromagnetically driven valve according to any one of claims 4 to 6, wherein the armature is made of spring steel, and the torsion bar and the armature are integrally formed.   The electromagnetically driven valve according to any one of claims 1 to 7, wherein the core portion is formed of spring steel.   The electromagnetically driven valve according to claim 8, wherein the core portion has an adsorption surface that faces the armature and repeatedly collides with the armature, and the adsorption surface is heat-treated. The armature is formed of spring steel;
The electromagnetically driven valve according to any one of claims 1 to 9, wherein the armature includes a surface facing the core portion and repeatedly colliding with the core portion, and the surface is heat-treated.

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