JPH05280314A - Electromagnetic drive valve - Google Patents

Abstract

PURPOSE:To increase a drive force of an electromagnetic valve by a moving coil disposed in a cavity on the outer periphery of a cylindrical magnet pole and changed in the shape. CONSTITUTION:Upper and lower magnetic fields 2, 3 are formed of cores 20, 30, permanent magnets 21, 31 and upper and lower coils 23, 33 to generate powerful magnetic fields in cavities 24, 34 between center magnetic poles 2a, 3a and side magnetic poles 22, 32. A moving coil 4 interposed in the cavities 24, 34 has the vertical portions 40, 41 overlappingly combined with each other parallel to the driving direction to form a long length of arcuate portion of a conductor generating a thrust for increasing a drive force to a electromagnetic valve 1.

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 provided at an intake / exhaust port of a cylinder of an engine and driven by an electromagnetic force.

[0002]

2. Description of the Related Art Conventionally, an intake / exhaust valve arranged in a cylinder is mechanically opened / closed by a camshaft driven based on the rotation of a crankshaft, a rocker arm, etc. Because of its small size, various electromagnetically driven valves that have been driven by electromagnetic force to increase the degree of freedom have been tried.

In order to control the opening and closing of this type of valve, there is a valve control device having a drive means which is always biased in the closing direction by the magnetic force of a permanent magnet and is driven in the opening direction by an electromagnetic force. As shown in Japanese Patent No. 123210, an explanatory view from the top surface shown in FIG. 5 using a pair of saddle type movable wire wheels as shown in FIG. 4 in order to increase the stroke of the electromagnetic valve and control the driving speed. Has been developed in which a valve operating mechanism is arranged in the magnetic field and is driven in the vertical direction by controlling the energization of the movable wheel.

[0004]

In the above valve operating mechanism, the desired stroke can be obtained by changing the span of the magnetic field in the vertical direction, and the drive speed can be controlled by controlling the supplied current. The electromagnetic force due to the vertical portion of the movable coil shown in FIG. 4 becomes independent of the vertical drive, and this vertical portion occupies a large area in an arc shape in the circumferential direction, which reduces the arc-shaped conductor length that effectively produces the driving force. The inconvenience has occurred.

The present invention has been made in view of the above problems, and an object thereof is to provide a winding portion irrelevant to a driving force in a pair of saddle type movable coils arranged in a magnetic field to serve as a valve mechanism. An object of the present invention is to provide an electromagnetically driven valve whose shape is deformed to improve the thrust of the movable coil.

[0006]

In order to achieve the above object, according to the present invention, a pair of saddle type movable wires are arranged in an air gap having a magnetic flux along the outer peripheral wall of a cylindrical magnetic pole and traversing the magnetic pole. In an electromagnetically driven valve driven by a cylindrical valve mechanism having a combination of wheels, a wire wheel that reduces the occupied portion of the conductor portion parallel to the driving direction of the saddle type movable wire wheel in the gap. An electromagnetically actuated valve having a forming means is provided.

[0007]

In the valve mechanism formed by a pair of saddle type movable wire wheels, the portion of the conductor irrelevant to the thrust which is irrelevant to the thrust is occupied in the gap, and the portion of the arc-shaped conductor that produces the thrust is increased. The thrust of the valve mechanism is increased, and the electromagnetic valve can be driven strongly.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a top view and a vertical sectional view showing an embodiment of an electromagnetically driven valve according to the present invention, and FIG. 2 is a perspective view showing the shape of a movable coil used in this embodiment. In these drawings, reference numeral 1 denotes an electromagnetic valve, a stem 11 of which is vertically reciprocally supported by a valve guide 12 and, when the valve is closed, a valve seat 13 of an intake port or an exhaust port of a cylinder.
The valve portion 14 is seated on the valve to close the flow path.

Reference numeral 2 denotes an upper field, which is a core portion 20 having a cylindrical central magnetic pole 2a and an outer yoke 2b, a pair of permanent magnets 21 and 21, and a side magnetic pole 2 corresponding to the central magnetic pole 2a.
2, 22 and upper coils 23, 23, and a center magnetic pole 2a and a side magnetic pole 22 in which a movable coil described later is arranged.
It is configured to generate a strong magnetic field in the air gap 24 of the.

A lower field 3 is provided with a core portion 30 having a central magnetic pole 3a and an outer yoke 3b, permanent magnets 31, 31, side magnetic poles 32, 32, lower coils 33, 33, and the upper field 2 described above. Is arranged upside down, and the direction of the magnetic flux in the air gap 34 generated by the permanent magnet 31 and the lower coil 33 is opposite to the direction of the air gap 24 in the upper portion.

Reference numeral 4 denotes a movable wire wheel, in which two saddle-shaped wire wheels concentratedly wound are combined from the left and right, and a vertical portion 40, which is the combined end portion, is formed on the outer surface of the other vertical portion 41. The arc portions 42 and 43 have a long conductor length, and the inner circumferential surface of the arc portions 42 and 43 has a long conductor length.
Is formed in a cylindrical shape so as to form a predetermined gap, and when the movable coil 4 is energized, the arc portion 4 above the movable coil 4 is energized.
The magnetic flux generated in 2 generates a vertical thrust by the electromagnetic force of the magnetic field of the air gap 24 of the upper field 2, and the magnetic flux generated in the lower arc portion 43 becomes the electromagnetic force of the magnetic field of the air gap 34 of the lower field 3. Are configured to generate thrust in the same direction.

It should be noted that the lower end portion of the movable wire wheel 4 has an electromagnetic valve 1
It is fixed to the upper seat 16 attached to the stem 11 by the fixing metal fitting 15, and the electromagnetic valve 1 is opened by pressing the spring 17 by the downward thrust when energized.

Next, the operation of the present embodiment constructed as described above will be explained. The movable coil 4 comprising two saddle type coils.
The ends of are overlapped and formed narrower than the circumference,
On the other hand, since the arc portions 42 and 43 in which the magnetic flux due to energization generates thrust have a large conductor length, the side magnetic poles 22 and 3 are formed.
The portion corresponding to the central magnetic pole 2 can also be formed wide, so that the movable coil wheel 4 when energized produces a strong thrust to lower the electromagnetic valve 1.

FIG. 3 shows a modification of the shape of the vertical portion of the movable coil in this embodiment. As shown in the drawing, the vertical portion 45 irrelevant to the thrust is bent in the radial direction so as to project, and the adjacent vertical portion It is fixed to face 46.

Therefore, in the case of the movable coil having the vertical portions facing each other as described above, the conductor length of the arc portion 47 can be further increased, so that the thrust is also increased.

Although the present invention has been described with reference to the above-described embodiments, various modifications can be made within the scope of the gist of the present invention, and these modifications are not excluded from the scope of the present invention.

[0018]

According to the present invention as in the above embodiments,
Since a pair of saddle-shaped movable coils are made to face each other and conductor portions parallel to the driving direction of the electromagnetic valve are overlapped with each other and combined, a large arc-shaped conductor length is formed in the gap formed by the upper and lower fields. Therefore, the arc-shaped portion that generates the driving force becomes large, and the thrust of the electromagnetic valve increases.

Further, according to the present invention, since the conductor portion of the movable coil parallel to the driving direction is bent outward in the radial direction and is removed from the gap having the magnetic flux, a large arc-shaped portion can be formed. , The advantage of increased thrust occurs.

[Brief description of drawings]

FIG. 1 is a top view and a vertical sectional view showing an embodiment of an electromagnetically driven valve according to the present invention.

FIG. 2 is a perspective view showing the shape of a movable coil used in this embodiment.

FIG. 3 is a perspective view showing another shape of the movable coil wheel used in this embodiment.

FIG. 4 is a perspective view showing a shape of a conventional movable coil.

5 is an explanatory view from the upper surface of a mechanism using the movable coil shown in FIG. 4. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Electromagnetic valve 2 ... Upper field 3 ... Lower field 4 ... Movable coil 21 ... Permanent magnet 24 ... Void 40,41 ... Vertical part 42, 43 ... Arc part

Claims (3)

[Claims] 1. An electromagnetically driven valve which is arranged in a gap having a magnetic flux that crosses the magnetic pole along the outer peripheral wall of the cylindrical magnetic pole and which is driven by a cylindrical valve operating mechanism in which a pair of saddle type movable coils are combined. The electromagnetically driven valve according to claim 1, further comprising a wire ring forming means for reducing the occupied portion of the conductor portion parallel to the driving direction of the saddle type movable wire wheel in the gap. 2. The electromagnetically driven valve according to claim 1, wherein the coil forming means superimposes conductor portions parallel to the driving direction on conductor portions adjacent to each other. 3. The electromagnetically driven valve according to claim 1, wherein said coil forming means bends a conductor portion parallel to said driving direction to form a radial direction.