JPH06288211A - Eelectromagnetic drive valve - Google Patents

Abstract

PURPOSE:To electrically regenerate a part of driving energy by way of driving an air suction and exhaust valve of a long stroke by attractive force of a plunger type electromagnet and a permanent magnet. CONSTITUTION:Above a stem 11, a plunger 3 of a magnetic substance and a permanent magnet 31 magnetized in the axial direction are installed and they are biased at a valve closing position by a spring 2. An electromagnetic drive part 4 is furnished with a shell type core 42 to attract the plunger 3 and a collection coil 43 to generate electromotive force by vertical movement of its exciting coil 41 and the permanent magnet 31. At the time of valve opening drive, when the exciting coil 41 is electrified in a specified direction, the magnetized core 42 attracts the plunger 3, a magnetic pole above the core 42 attracts the permanent magnet 31, by attraction force of both of them, an electromagnetic valve 1 of a long stroke is opened, additionally, by movement of the permanent magnet 31, electromotive force is generated on the collection coil 43, and electric power is regenerated.

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 arranged at an intake / exhaust port of a cylinder of an internal combustion engine and opened / closed by an electromagnetic force.

[0002]

2. Description of the Related Art An intake / exhaust valve arranged at an intake / exhaust port of a cylinder is normally mechanically driven via a timing belt based on rotation of a crankshaft to open / close the intake / exhaust port. Since the degree of freedom is small, an electromagnetic valve that uses electromagnetic force to increase the degree of freedom has been developed.

As this type of electromagnetic valve, one using a flat plate type electromagnet has been devised, for example, Japanese Patent Laid-Open No. 2-1232.
No. 10 discloses an electromagnetic valve that uses a flat electromagnet as a valve control device that drives an intake / exhaust valve that is always biased in a closing direction by a permanent magnet in an opening direction by an electromagnetic force.

[0004]

Due to the structure of the electromagnetic valve using the above-mentioned flat plate electromagnet, the magnetic flux density in the air gap cannot be sufficiently secured due to its structure, so that a large attractive force can be obtained. There is also a problem that the electric energy that causes the suction force is consumed and cannot be recovered.

The present invention has been made in view of the above problems, and an object thereof is to provide an electromagnetically driven valve that can obtain a sufficient suction force even with a large stroke and can recover energy.

[0006]

To achieve the above object, according to the present invention, a plunger made of a magnetic material attached to a stem of an intake / exhaust valve is driven by an attractive force of an electromagnet to open the valve, and a spring is opened. In an electromagnetically driven valve that is closed by the elastic force of, the permanent magnet that is attached to the stem and is magnetized in the direction that urges the attraction force of the electromagnet when the valve is opened, and the magnetic flux from the permanent magnet Provided is an electromagnetically driven valve including a recovery coil that generates an electromotive force in response to movement of a permanent magnet.

[0007]

Operation: A permanent magnet is attached above the plunger provided on the stem, and the magnetic pole of the permanent magnet is magnetized in the direction of energizing the attraction force of the electromagnet when the valve is opened, and the recovery is linked to the magnetic flux of the permanent magnet. Since the coil is installed on the fixed side, when the exciting coil of the electromagnet is energized and the electromagnetic valve is opened, the magnetic force of the permanent magnet is added to the attractive force of the electromagnet to obtain a strong driving force. An electromotive force is generated in the recovery coil and power is regenerated.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a vertical sectional view showing an embodiment of an electromagnetically driven valve according to the present invention, and FIG. 2 is a sectional view showing an electromagnetic mechanism at a valve opening position in the present embodiment.

In these drawings, reference numeral 1 denotes an electromagnetic valve, the stem 11 of which is supported by a valve guide 12, and when the valve is closed, a valve portion 14 is seated on a valve seat 13 to close the flow path.

Reference numeral 2 denotes a spring, which is an upper seat 21 attached to a predetermined position of the stem 11 and a cylinder upper wall 15.
It is arranged between and, and always biases the electromagnetic valve 1 to the upper position, that is, the valve closing position by the elastic force.

Reference numeral 3 denotes a plunger made of a ferromagnetic material, which is attached above the stem 11 and is attracted by an electromagnetic drive unit 4 which will be described later to open the electromagnetic valve 1.
A ring-shaped permanent magnet 31 is provided on the upper part of the magnet, and its magnetization is magnetized, for example, as shown in the figure, the upper N pole and the lower S pole.

The electromagnetic drive unit 4 is provided with an outer iron type core 41, a ring-shaped exciting coil 42 for exciting the core 41, and an annular recovery coil 43 arranged above the core 41, and above the cylinder upper wall 15. It is installed at a predetermined position of.
Then, the plunger 3 having the permanent magnet 31 is attracted downward by the electromagnetic force generated by the energization of the exciting coil 42, and the magnetic flux of the permanent magnet 31 that moves during the attraction or the elastic force of the spring 2 causes the recovery coil 43 to wake up. It is configured to generate power.

Reference numeral 5 denotes a rectifying circuit, which is provided with, for example, a diode or a capacitor to convert the electromotive force of the recovery coil 43 into a direct current. It is wired so as to be guided.

Next, the operation of the present embodiment thus constructed will be described. When a current in the direction shown in FIG. 1 is passed through the exciting coil 41 when the electromagnetic valve 1 is opened, the electromagnetic force causes an attractive force of the plunger 3 of the ferromagnetic body, and the magnetic pole portion above the core 41 becomes the N pole. When magnetized, the south pole below the permanent magnet 31 is strongly attracted, and the thrust of both moves the stem 11 downward to open the electromagnetic valve 1 even if the stroke is somewhat long. At this time, since the magnetic flux from the permanent magnet 31 moves while interlinking the recovery coil 43,
An electromotive force is generated in the recovery coil 43 and flows into the rectifier circuit 5.

When the electromagnetic coil 1 is closed, the exciting coil 42 is de-energized, and the plunger 3 attracted downward is driven upward by the elastic force of the spring 2 to close the electromagnetic valve 1. However, since the permanent magnet 31 at the position shown in FIG. 2 returns upward, the magnetic flux of the permanent magnet 31 is linked to the recovery coil 43 to generate electromotive force, which flows into the rectifier circuit 5 and is recovered. .

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.

[0017]

According to the present invention as in the above embodiments,
A permanent magnet is attached above the plunger attached to the stem, and the polarity of the magnetic pole is magnetized so as to attract each other with the polarity opposite to that of the core at the time of attraction, and the recovery coil is located at the position interlinking with the magnetic flux of the permanent magnet. Since the electromagnetic valve is installed, the attraction force of the electromagnet and the thrust force of the permanent magnet work together when the electromagnetic valve is opened to drive strongly even if the valve stroke is a little longer, and the permanent magnet is moved to open and close the valve for recovery. The effect that electromotive force is generated in the coil and power is regenerated is obtained.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view showing an electromagnetic mechanism at the time of valve suction in the present embodiment.

[Explanation of symbols]

 1 ... Electromagnetic valve 2 ... Spring 3 ... Plunger 4 ... Electromagnetic drive unit 11 ... Stem 31 ... Permanent magnet 41 ... Core 42 ... Excitation coil 43 ... Recovery coil

Claims (1)

[Claims] 1. An electromagnetically driven valve in which a magnetic plunger mounted on the stem of an intake / exhaust valve is driven by the attraction force of an electromagnet to open the valve and closed by the elastic force of a spring. A permanent magnet magnetized in a direction in which the attraction force of the electromagnet is biased when the valve is opened, and a recovery coil that interlinks with the magnetic flux from the permanent magnet and generates an electromotive force according to the movement of the permanent magnet. Electromagnetically driven valve characterized by.