JP2005299483A - Electromagnetic valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic valve capable of reducing power consumption when operating an armature stopped in a neutral position. <P>SOLUTION: This electromagnetic valve is provided with an electromagnetic actuator 32 for driving both of opening/closing operation and a side core 33 near a side of the armature 24. In the side core 33, a part corresponding to a neutral position of the armature 24 is provided with first clearances 34 and 35, and provided with second clearances 36 and 37 in both vertical sides of the first clearances so that the armature 24 is tilted to be separated in a displacing direction from the neutral position thereof, as it separates more from an armature stem 19. When a lower coil 31 is electrified in the condition wherein the armature 24 is stopped in the neutral position, these clearances 34-37 deflect direction of a flux, which passes through the armature 24 and the side core 33 in order, along the clearances 34-37. With this deflection, divided force directing to a lower core 26 is generated in the electromagnetic force. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electromagnetically driven valve suitable as a mechanism constituting, for example, an intake valve or an exhaust valve of an internal combustion engine.

  For example, as an intake valve or an exhaust valve of an internal combustion engine, it is considered to employ an electromagnetically driven valve that is opened and closed by electromagnetic force instead of a valve that is opened and closed based on the rotation of a camshaft (for example, Patent Document 1). This electromagnetically driven valve is a valve that functions as an intake valve or an exhaust valve, an armature system that is arranged coaxially with the valve and provided with an armature, a pair of springs that urge the armature to a neutral position, and a displacement direction of the armature A pair of electromagnetic actuators disposed on both sides of the. Each electromagnetic actuator includes a core and an electromagnetic coil. When an exciting current flows by energizing the electromagnetic coil in one electromagnetic actuator, an electromagnetic force directed toward the core acts on the armature. By this electromagnetic force, the armature stem is displaced in the axial direction and the valve is driven. Accordingly, the valve is driven to open and close by alternately applying an exciting current to both electromagnetic actuators.

In addition, as a prior art document concerning this invention, the following patent document 2 is mentioned other than the patent document 1 mentioned above.
JP 2003-318025 A Japanese Patent Laid-Open No. 62-278386

  By the way, in the electromagnetically driven valve, for example, when the engine is stopped, the armature is stopped at the neutral position. When the armature is displaced from the neutral position and the valve is driven, the electromagnetic coil in the electromagnetic actuator in the displacement direction is energized. From the viewpoint of reducing the energy (power consumption) required for driving, it is desirable to reduce the energization current to the electromagnetic coil. However, in reality, the conventional electromagnetically driven valves including Patent Document 1 and Patent Document 2 described above have not been devised to reduce the power consumption at the time of starting.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an electromagnetically driven valve capable of reducing power consumption when operating an armature stopped at a neutral position. is there.

In the following, means for achieving the above object and its effects are described.
According to the first aspect of the present invention, the valve, the armature stem disposed coaxially with the valve and provided with the armature, and disposed on both sides in the displacement direction of the armature, the core and the electromagnetic coil And a pair of electromagnetic actuators for driving the valve by displacing the armature stem in the axial direction by applying an electromagnetic force generated upon energization of the electromagnetic coil to the armature. The side coil provided in the lateral vicinity of the both electromagnetic actuators and the armature, and the armature is stopped at a neutral position between the two electromagnetic actuators, and the electromagnetic coil of one electromagnetic actuator is energized. Sometimes the magnetic flux passing through the armature and the side core in turn is Farther from the stem, and a magnetic flux deflecting means for deflecting away from said neutral position for the armature to the displacement direction.

  According to the above configuration, when the electromagnetic coil in one electromagnetic actuator is energized while the armature is stopped at the neutral position, a magnetic circuit including the armature and the core is formed, and the armature, the side core, and the core are included. A magnetic circuit is formed, a magnetic flux is generated around the electromagnetic coil, and an electromagnetic force directed toward the core acts on the armature. By this electromagnetic force, the armature is attracted to the core side with the armature stem and displaced, and the valve coaxial with the armature stem is driven to open and close.

  By the way, in the magnetic circuit including the armature, the side core, and the core, if the direction of the magnetic flux in the side core is orthogonal to the armature stem, the magnetic force does not generate a component force toward the core. In this regard, according to the first aspect of the present invention, when the magnetic flux passes through the side core, the magnetic flux is deflected away from the neutral position of the armature in the displacement direction as the distance from the armature stem increases. This deflection creates a component force for the armature toward the core for the electromagnetic force. As a result of this component force, less current is passed through the electromagnetic coil, and drive energy can be reduced. In other words, even with a small energization current, the armature stopped at the neutral position can be displaced to open and close the valve, thereby reducing power consumption.

  According to a second aspect of the present invention, in the first aspect of the present invention, the side core is constituted by a part of a case that covers the armature stem and the two electromagnetic actuators.

  According to said structure, since a part of case which covers an armature stem and both electromagnetic actuators functions as a side core, it is not necessary to provide a side core separately from a case, and can reduce a number of parts.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the magnetic flux deflecting means includes a first gap provided at a position corresponding to the neutral position of the armature in the side core. And

  According to said structure, the air in a space | gap becomes resistance of magnetic flux. For this reason, the magnetic flux tries to avoid the first gap when sequentially passing through the armature and the side core stopped at the neutral position. Since the first gap is provided at a position corresponding to the neutral position of the armature, the direction of the magnetic flux in the side core is not perpendicular to the armature stem, and from the beginning of energization to the electromagnetic coil, A component force toward the core acts on the electromagnetic force.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the first gap is constituted by a groove that opens at least on the inner side surface of the side core.
According to said structure, the 1st space | gap opened to the inner surface of a side core becomes resistance of magnetic flux, and when the magnetic flux from an armature passes a side core, it is reliably deflected in the displacement direction of the armature.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the magnetic flux deflecting means is provided in the side core, and the further away from the armature stem, the more about the armature. Suppose that it inclines so that it may move away from a neutral position to a displacement direction.

  According to the above configuration, the magnetic flux tries to avoid the second air gap when sequentially passing through the armature and the side core stopped at the neutral position. This 2nd space | gap is inclined so that it may move away from the neutral position about an armature in a displacement direction, so that it leaves | separates from an armature stem. Therefore, the direction of the magnetic flux in the side core is deflected in the same or substantially the same direction as the tilt direction by the second gap. This deflection reliably generates a component force toward the core for the electromagnetic force.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, it is assumed that the end portion of the second gap on the side opposite to the armature stem is separated from the outer surface of the side core.
According to the above configuration, when the magnetic flux deflected by the second air gap reaches the end of the second air gap on the side opposite to the armature stem, the direction is changed to the armature displacement direction. Therefore, the magnetic flux once deflected can be reliably returned from the side core to the core.

In the invention according to claim 7, in the invention according to claim 5 or 6, a plurality of the second gaps are provided in a state of being separated from each other in the displacement direction of the armature.
According to the above configuration, when the armature is displaced from the neutral position by the electromagnetic force generated when the electromagnetic coil is energized, the positional relationship between the armature and the side core is changed along with the displacement. However, since the plurality of second gaps are provided in the side core so as to be spaced apart from each other, the direction of the magnetic flux that exits the armature and passes through the side core is determined by any of the second gaps regardless of the position of the armature. Deflected. Therefore, the effect of the invention described in claim 1 can be maintained.

Hereinafter, an embodiment of an electromagnetically driven valve according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the cylinder head 11 of the internal combustion engine is formed with a port 13 that forms part of the intake passage or part of the exhaust passage and communicates with the combustion chamber 12. A valve seat 14 is provided at the end of the port 13 on the combustion chamber 12 side. The cylinder head 11 is provided with a valve 15 that functions as an intake valve or an exhaust valve. The valve 15 includes a valve stem 15A supported by a valve guide 16 so as to be reciprocable in the axial direction (vertical direction in the figure), and a valve body 15B provided at the lower end of the valve stem 15A. The port 13 is in communication (opened) state with the combustion chamber 12 when the valve stem 15A is displaced downward and the valve body 15B is separated from the valve seat 14. Further, the port 13 is disconnected (closed) from the combustion chamber 12 when the valve stem 15A is displaced upward and the valve body 15B is seated on the valve seat 14.

  A lower retainer 17 is attached to the upper portion of the valve stem 15A. A lower spring 18 is disposed in a compressed state between the cylinder head 11 and the lower retainer 17 and around the valve stem 15A. The lower spring 18 constantly biases the valve 15 in the valve closing direction (upward). Has been.

  On the same axis as the valve stem 15A, an armature stem 19 made of a nonmagnetic material is disposed so as to be able to reciprocate in the axial direction (vertical direction in FIG. 1). An applicator 21 is attached to the upper end of the armature stem 19. An upper cap 22 is fixed to the cylinder head 11 via a case 20. An upper spring 23 is disposed in a compressed state between the upper cap 22 and the upper retainer 21. By this upper spring 23, the upper retainer 21 is always urged downward.

  A lash adjuster 30 is disposed between the armature stem 19 and the valve stem 15A. The lash adjuster 30 absorbs a difference in thermal expansion between the valve body 15B and the cylinder head 11, a relative displacement between the valve stem 15A and the armature stem 19 due to wear of the valve seat 14 and the valve body 15B, and the like. In order to prevent the gap between the valve stem 15A and the armature stem 19 from being generated.

  An armature 24 is fixed to a substantially central portion in the axial direction of the armature stem 19. In the case 20, an upper core 25 is fixed between the armature 24 and the upper retainer 21. Similarly, a lower core 26 is fixed between the armature 24 and the lower retainer 17 in the case 20. The armature stem 19 is inserted into the upper core 25 and the lower core 26 and supported by the slide bearings 27 so as to be reciprocally movable.

  In the upper core 25, two grooves 25 </ b> A are formed on the surface facing the armature 24 (the lower surface in FIG. 1) with the armature stem 19 sandwiched therebetween, and the upper coil as an electromagnetic coil wound in a substantially rectangular shape Many portions of 28 are accommodated in these grooves 25A. The upper coil 28 is covered with a synthetic resin 40 at least in the groove 25A. The upper core 25 and the upper coil 28 constitute a closing drive electromagnetic actuator 29 for driving the valve 15 in the valve closing direction.

  Similarly, two grooves 26 </ b> A are formed on the surface of the lower core 26 facing the armature 24 (upper surface in FIG. 1) with the armature stem 19 sandwiched therebetween, as an electromagnetic coil wound in a substantially rectangular shape. Many portions of the lower coil 31 are accommodated in the grooves 26A. The lower coil 31 is covered with the synthetic resin 40 at least in the groove 26A. The lower core 26 and the lower coil 31 constitute an opening drive electromagnetic actuator 32 for driving the valve 15 in the valve opening direction.

  Further, as shown in FIGS. 1 and 2, side cores 33 are arranged in the vicinity of the sides of the electromagnetic actuators 32 and 29 for both opening and closing and the armature 24. In this embodiment, the side core 33 is configured by the side wall portion of the case 20 described above.

  On the inner side surface 33A and the outer side surface 33B of the side core 33, first gaps 34 and 35 are provided at positions corresponding to the neutral position of the armature 24 in a state of being separated from each other. Here, the neutral position of the armature 24 is a position where the armature 24 stops when the coils 31 and 28 of the open / close driving electromagnetic actuators 32 and 29 are not energized, and both biasing forces of the lower spring 18 and the upper spring 23 are applied. Is the position to balance. In the present embodiment, an intermediate position in the axial direction of the armature stem 19 between the cores 25 and 26 is the neutral position.

  The inner first gap 34 is constituted by a groove that opens on the inner side surface 33 </ b> A of the side core 33. This groove has a substantially triangular cross-sectional shape in which the distance between the upper and lower sides becomes narrower as the distance from the armature stem 19 increases. Further, the outer first gap 35 is configured by a groove that opens on the outer surface 33 </ b> B of the side core 33. This groove has a substantially triangular cross-sectional shape in which the upper and lower intervals become narrower as it approaches the armature stem 19.

  A plurality of second gaps 36 and 37 are provided inside the side core 33 and above and below the first gaps 34 and 35, respectively. The second gaps 36 and the second gaps 37 are inclined so as to move away from the neutral position with respect to the armature 24 in the displacement direction (vertical direction) as the distance from the armature stem 19 increases. The adjacent second gaps 36 (37) are separated from each other by a predetermined interval. In other words, the plurality of second gaps 36 on the upper side are inclined so as to become higher as they move away from the armature stem 19 in a parallel state. On the other hand, the plurality of second lower air gaps 37 are parallel to each other and are inclined so as to become lower as they move away from the armature stem 19.

  End portions (inner end portions) of the second gaps 36 and 37 near the armature stem 19 are close to the inner side surface 33 </ b> A of the side core 33. On the other hand, the end portions (outer end portions) of the second air gaps 36 and 37 on the side opposite to the armature stem are located relatively far from the outer surface 33B of the side core 33, for example, near the middle in the thickness direction of the side core 33. ing.

  Note that when the magnetic flux passes through the second gaps 36 and 37 that are farthest from the neutral position in the displacement direction, the magnetic flux can be quickly returned to the cores 25 and 26 while being deflected by the second gaps 36 and 37. , 26 is effective in efficiently generating the electromagnetic force directed to. In consideration of this point, in the present embodiment, the outermost end of the plurality of second gaps 36 is positioned closer to the armature stem 19 than the outer ends of the other second gaps 36. It is formed to do. Similarly, the lowermost one of the plurality of second gaps 37 is formed such that the outer end portion thereof is positioned closer to the armature stem 19 than the outer end portions of the other second gaps 37.

  The first air gaps 34 and 35 and the second air gaps 36 and 37 described above are magnetic fluxes that sequentially pass through the armature 24 and the side core 33 when the coils 28 and 31 are energized with the armature 24 stopped at the neutral position. The magnetic flux deflecting means is configured to deflect the armature 24 away from the neutral position in the displacement direction as the armature stem 19 is further away from the armature stem 19.

  The electromagnetically driven valve according to this embodiment is configured as described above. FIG. 1 shows a state in which energization to the coils 31 and 28 of the open / close drive electromagnetic actuators 32 and 29 is stopped, such as when the engine is stopped. In this state, the armature 24 is stopped at the neutral position, the valve body 15B is seated downward from the valve seat 14, and the valve 15 is slightly opened.

  From this state, for example, when an attractive current flows by energizing the lower coil 31, a magnetic circuit 38 including the armature 24 and the lower core 26 is formed, and the armature 24, the side core 33, and the lower core 26 are formed as shown in FIG. 2. A magnetic circuit 39 is formed, and lines of magnetic force are generated around the lower coil 31. In the latter magnetic circuit 39, when a magnetic flux that passes through the armature 24 and the side core 33 is generated in sequence, if the direction of the magnetic flux in the side core 33 is orthogonal to the armature stem 19, depending on the magnetic flux, the lower core 26 is reduced in terms of electromagnetic force. No component force toward is generated. In this regard, in the present embodiment, when the magnetic flux passes through the side core 33, the magnetic flux is deflected obliquely so as to move away from the neutral position with respect to the armature 24 in the displacement direction (downward) as it moves away from the armature stem 19.

This is due to the following reasons (i) to (iii).
(I) In the side core 33, the first gaps 34 and 35 are provided at locations corresponding to the neutral position of the armature 24. Moreover, the inner first gap 34 is formed by a groove that opens on the inner side surface 33 </ b> A of the side core 33. The air in the first gaps 34 and 35 serves as a magnetic flux resistance. For these reasons, when the magnetic flux emitted from the armature 24 stopped at the neutral position passes through the side core 33, it tries to pass through a place having as little resistance as possible. There is almost no magnetic flux crossing the first gaps 34 and 35, and most of the magnetic flux passes through the first gaps 34 and 35. For this reason, the direction of the magnetic flux in the side core 33 is not orthogonal to the armature stem 19 and is deflected away from the neutral position of the armature 24 in the displacement direction as the distance from the armature stem 19 increases.

  (Ii) This is because the second gap 37 is provided inside the side core 33 so as to be farther away from the neutral position of the armature 24 in the displacement direction as it is farther from the armature stem 19. That is, for the same reason as the above (i), when the magnetic flux emitted from the armature 24 stopped at the neutral position passes through the side core 33, the magnetic flux tries to avoid the second gap 37. Therefore, the direction of the magnetic flux in the side core 33 is deflected by the second gap 37 in substantially the same direction as the inclination direction.

  (Iii) This is because the plurality of second gaps 37 are provided in the side core 33 so as to be separated from each other in the displacement direction of the armature 24. That is, when the armature 24 is displaced from the neutral position by the electromagnetic force generated when the lower coil 31 is energized, the positional relationship between the armature 24 and the side core 33 changes as shown in FIGS. . Note that the two-dot chain line in FIGS. 4 and 5 indicates the armature 24 in the neutral position. However, since the plurality of second gaps 37 are provided in the side core 33 in the displacement direction of the armature 24 as described above, the direction of the magnetic flux that flows out of the armature 24 and flows in the side core 33 is the position of the armature 24. Regardless, it is deflected by any second gap 37.

  When the magnetic flux deflected by the second gap 37 as described above reaches the end (outer end) of the second gap 37 on the side opposite to the armature stem, the direction is changed to the displacement direction of the armature 24. And if magnetic flux passes through the 2nd space | gap 37 located in the lowest part about a displacement direction, direction will be changed to the lower core 26 side.

  As shown in FIG. 3, the electromagnetic force F generated by the deflected magnetic flux is decomposed into a component orthogonal to the armature stem 19 (component force F1) and a component parallel to the armature stem 19 (component force F2). The In this way, not only the component force F1 toward the outer side of the electromagnetic force F but also the component force F2 toward the lower core 26 is generated for the armature 24. This component force F2 is added to the original electromagnetic force directed to the open drive electromagnetic actuator 32 by the magnetic circuit 38. Due to these electromagnetic forces, the armature 24 is displaced downward, and the valve body 15B is further separated from the valve seat 14. When the armature 24 is further displaced, the valve body 15B is brought into a fully open state in contact with the lower core 26.

  When energization to the lower coil 31 is stopped from this state, the magnetic attractive force for holding the armature 24 in the fully open state disappears. Therefore, the armature 24 starts to be displaced toward the closing drive electromagnetic actuator 29 by the urging force of the lower spring 18.

  Thereafter, when the amount of displacement of the armature 24 reaches a predetermined value, energization of the upper coil 28 is started. When an energization current flows through the upper coil 28 by this energization, a magnetic circuit composed of the armature 24 and the upper core 25 is formed, and a magnetic circuit composed of the armature 24, the side core 33, and the upper core 25 is formed. Magnetic field lines are generated around the upper coil 28, and an electromagnetic force directed toward the closing drive electromagnetic actuator 29 is generated with respect to the armature 24, so that the armature 24 is displaced upward. When the armature 24 is further displaced, the valve body 15B is seated on the valve seat 14 and is fully closed, and the valve stem 15A is no longer displaced in the valve closing direction. Therefore, thereafter, only the armature stem 19 is displaced in the same direction against the upper spring 23. Thereafter, when the armature 24 comes into contact with the upper core 25, the armature stem 19 is no longer displaced in the same direction.

  When the energization of the upper coil 28 is stopped from this state, the magnetic attractive force for holding the armature 24 in the fully closed state disappears. For this reason, the armature 24 starts to be displaced toward the opening driving electromagnetic actuator 32 by the urging force of the upper spring 23.

  Thereafter, when the amount of displacement of the armature 24 reaches a predetermined value, energization to the lower coil 31 is started. When an energization current flows through the lower coil 31 due to this energization, an electromagnetic force directed to the opening drive electromagnetic actuator 32 acts on the armature 24, and the armature 24 is displaced downward.

  Accordingly, by controlling the energization of the open / close drive electromagnetic actuators 32 and 29 so that the exciting current flows alternately to the upper coil 28 and the lower coil 31 as described above, the valve 15 is driven to open and close, and the intake valve or the exhaust valve Function as.

  Note that the description of the case where the attracting current flows by energizing the upper coil 28 from the state where the armature 24 is stopped at the neutral position is basically the same as above.

According to the embodiment described in detail above, the following effects can be obtained.
(1) A side core 33 is provided in the vicinity of the sides of the electromagnetic actuators 32 and 29 for driving both opening and closing and the armature 24, and the distance from the neutral position of the armature 24 in the displacement direction is increased in the side core 33 from the armature stem 19. The second gaps 36 and 37 that are inclined to each other are provided. For this reason, the direction of the magnetic flux in the side core 33 can be deflected in substantially the same direction as the inclination direction of the second gaps 36 and 37, and the component force F <b> 2 directed to the cores 25 and 26 can be generated with respect to the electromagnetic force F. Since the component force F2 is generated, less current is applied to the coils 28 and 31, and even when the current is small, the armature 24 stopped at the neutral position is displaced to open / close the valve 15. Is possible. The amount of energized electricity at the start of movement from the neutral position can be reduced, and the power consumption can be reduced.

  (2) In the side core 33, first gaps 34 and 35 are provided at locations corresponding to the neutral position of the armature 24. For this reason, it is possible to prevent the direction of the magnetic flux in the side core 33 from being orthogonal to the armature stem 19 at the beginning of energization of the coils 28 and 31. The direction of the magnetic flux in the side core 33 can be deflected away from the neutral position with respect to the armature 24 in the displacement direction as the distance from the armature stem 19 increases.

  (3) The first gap 34 is constituted by a groove that opens on the inner side surface 33 </ b> A of the side core 33. The first gap 34 serves as a resistance for passage of magnetic flux. For this reason, when the magnetic flux from the armature 24 passes through the side core 33, it can be reliably deflected to one of the second gaps 36 and 37.

  (4) The plurality of second gaps 36 and 37 are provided in the side core 33 in a state of being separated from each other in the displacement direction of the armature 24. Therefore, for a while after the armature 24 starts to be displaced from the neutral position, the magnetic flux can be deflected regardless of the amount of displacement, and the effect (1) can be further ensured.

  (5) The end portions (outer end portions) on the side opposite to the armature stem of the second gaps 36 and 37 are separated from the outer surface 33B of the side core. Therefore, the direction of the magnetic flux deflected by the second air gaps 36 and 37 and reaching the outer end thereof can be changed to the displacement direction of the armature 24, and can be reliably returned from the side core 33 to the cores 25 and 26.

  (6) The outer end of the uppermost one of the second gaps 36 is positioned closer to the armature stem 19 than the others. Similarly, the outer end portion of the lowermost second gap 37 is positioned closer to the armature stem 19 than the others. Therefore, the magnetic flux can be quickly returned to the cores 25 and 26 while being deflected by the second gaps 36 and 37, and the electromagnetic force directed to the cores 25 and 26 can be efficiently generated.

  (7) A part of the case 20 that covers the armature stem 19 and the electromagnetic actuators 32 and 29 for both opening and closing driving functions as the side core 33. For this reason, it is not necessary to provide the side core 33 separately, and the number of parts can be reduced.

Note that the present invention can be embodied in another embodiment described below.
-You may change the cross-sectional shape of the 1st space | gap 34 and 35 into shapes other than the triangle mentioned above.
The cross-sectional shape and number of the second gaps 36 and 37 may be different from those in the above embodiment. For example, although the linear cross-sectional shape is used in the embodiment, the cross-sectional shape may be changed to a curved cross-sectional shape.

The end portions (inner end portions) of the second gaps 36 and 37 on the armature stem 19 side may be opened on the inner side surface 33 </ b> A of the side core 33.
The side core 33 may be constituted by a member different from the case 20.

  The position of the upper spring 23 that urges the armature stem 19 in the valve opening direction of the valve body 15B may be changed below the lower core 26. In this case, for example, a retainer is attached to the lower end portion of the armature stem 19, and the upper spring 23 is disposed between the retainer and the lower core 26.

The schematic sectional drawing of the electromagnetically driven valve in one Embodiment which actualized this invention. The partial expanded sectional view of FIG. The enlarged view of the A section in FIG. The fragmentary sectional view which shows the change of the direction of magnetic flux in case an armature displaces to a valve opening direction from a neutral position. The fragmentary sectional view which shows the change of direction of magnetic flux in case an armature further displaces to a valve opening direction.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 15 ... Valve | bulb, 19 ... Armature stem, 20 ... Case, 24 ... Armature, 25 ... Upper core, 26 ... Lower core, 28 ... Upper coil (electromagnetic coil), 29 ... Electromagnetic actuator for closed drive, 31 ... Lower coil (electromagnetic coil), 32 ... open drive electromagnetic actuator, 33 ... side core, 33A ... inner side, 33B ... outer side, 34, 35 ... first gap (flux deflecting means), 36, 37 ... second gap (flux deflecting means), F ... electromagnetic Power.

Claims (7)

A valve,
The armature stem is disposed coaxially with the valve and provided with an armature, and is disposed on both sides of the armature in the displacement direction, and has a core and an electromagnetic coil. In an electromagnetically driven valve comprising a pair of electromagnetic actuators that actuate the generated electromagnetic force on the armature to displace the armature stem in the axial direction and drive the valve,
A side core provided in the lateral vicinity of both the electromagnetic actuator and the armature;
When the armature is stopped at the neutral position between the two electromagnetic actuators, when the electromagnetic coil of one of the electromagnetic actuators is energized, the magnetic flux passing through the armature and the side core in sequence is separated from the armature stem. And a magnetic flux deflecting means for deflecting the armature so as to move away from the neutral position in the displacement direction. The electromagnetically driven valve according to claim 1, wherein the side core is constituted by a part of a case that covers the armature stem and the two electromagnetic actuators. 3. The electromagnetically driven valve according to claim 1, wherein the magnetic flux deflecting unit includes a first gap provided at a position corresponding to the neutral position of the armature in the side core. The electromagnetically driven valve according to claim 3, wherein the first gap is configured by a groove that opens at least on an inner surface of the side core. The said magnetic flux deflection | deviation means is provided in the said side core, and is provided with the 2nd space | gap which inclines so that it may move away from the said neutral position about the said armature to a displacement direction, so that it leaves | separates from the said armature stem. Electromagnetically driven valve described in 1. The electromagnetically driven valve according to claim 5, wherein an end portion of the second gap on the side opposite to the armature stem is separated from an outer surface of the side core. The electromagnetically driven valve according to claim 5 or 6, wherein a plurality of the second gaps are provided in a state of being separated from each other in the displacement direction of the armature.

Images