JPS61171977A - Multipolar solenoid valve - Google Patents

Abstract

PURPOSE:To reduce the weight of an armature and strengthen attractive force by arranging the armature to be freely movable against an iron core in the groove parts of which conductive coils are wound around so as to form different magnetic poles alternately on the end faces of the tooth-shaped part. CONSTITUTION:An iron core 3 for opening valve is a comb-shaped disk on the flat surface of which plural number of groove parts 4 and tooth-shaped parts 5 are formed. In the groove parts 4 conductive coils 6 are fitted so as to generate magnetic poles on the end faces of the tooth-shaped parts 5. The winding direction of conductive coils 6 is changed alternately so that the magnetic poles differs alternately every tooth-shaped part 5. The armature 7 is arranged on the same axis as the iron core 3 for opening valve, and on the other end face side of the armature 7 opposite to the iron core an iron core 8 for closing valve having the same shape as the iron core 3 for opening valve is fixed in a valve casing 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a multipole solenoid valve for a fuel injection device for an internal combustion engine.

[Background of the invention]

As a solenoid valve for a fuel injection device, for example, JP-A-58-
As shown in Japanese Patent No. 133468, there is a device in which a flat surface pole electromagnet is used and a spool valve is fixedly connected to the flat surface pole. Although the influence of fluid pressure on valve operation can be reduced by using a spool valve, the valve stroke is larger than that of a poppet valve or the like. Therefore, if you try to increase the suction force to shorten the valve response time, you will have to increase the armature diameter to increase the suction area, which will significantly increase the armature weight and increase the inertia force. There's a problem. In addition, as related to this type of solenoid valve, for example,
5AE810462 Co1enoidaucluat
ors-Further l)development
inExtremely Fast acting 5
olenoids are known.

[Purpose of the invention]

The present invention was made in view of the above-mentioned situation, and an object of the present invention is to provide a multi-pole solenoid valve that can reduce the increase in armature current, increase the attractive force, and improve the operating characteristics of the valve. be.

[Summary of the invention]

In the multi-polar TA valve of the present invention, a conductive coil is wound around an iron core made of a ferromagnetic material, and when the conductive coil is excited, an armature is attracted and a valve body fixed to the armature is opened and closed. The iron core is configured such that a plurality of grooves and toothed portions are alternately formed on a flat surface of a comb-shaped plate, and the grooves are arranged such that the end faces of each of the toothed portions alternately form different magnetic poles. The wound conductive coil is arranged to be movable coaxially with respect to an axis that is formed into a flat plate and passes through the flat central part of the iron core, and is mounted with a predetermined gap provided to the end face of the toothed part. The above-mentioned armature is provided.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The multi-pole solenoid valve of the present invention will be explained below using an embodiment with reference to FIG. FIG. 1 is a longitudinal sectional view of the valve in the open state. In the figure, reference numeral 1 denotes a valve casing, and a guide member 2 is attached within the square casing 1, and the guide member 2 presses and fixes the valve opening core 3 against the valve casing l. The valve opening iron core 3 is
A comb-shaped disc is provided on the flat surface (I several grooves 4 and toothed portions 5).
is formed. A conductive coil 6 is attached to the groove portion 4 and formed on the end face of the toothed portion 5 so that a @ pole of N or S pole is generated. In this magnetic pole, the conductive coil 6 is wound in seven different winding directions so that the winding direction is alternately different for each toothed portion 5.

Reference numeral 7 denotes an armature, which is disposed coaxially with respect to the valve-opening iron core 3, and is provided in the valve casing 1 with one end face forming a space mt-to the end face of the toothed portion 5 and opposing it. . A valve-closing core 8 having the same shape as the valve-opening core 3 is fixed in the valve casing 1 on one end surface side of the pond with the contactor 7 in between. Valve closing iron core! Similarly to the valve opening core 3, conductive coils 6 are wound in the grooves 4 of 8 so that the winding directions are alternately different from each other.

The toothed portion 5 of the valve-opening core 3 is arranged to face the groove 4 of the valve-closing core 8, and the toothed portion 5 of the valve-closing core 8 is arranged to face the groove 4 of the valve-opening core 3. 6, magnetic flux is prevented from flowing to the iron core on the side to which no excitation current is supplied.

A spool valve 9 is coaxially connected to the armature 7 , and the spool valve 9 has a center hole 10 . It is slidably fitted into the hole 12. The center hole 10 is
On the one hand, it communicates with a low pressure chamber 14 formed in the main body 13,
On the other hand, it leads to a control line 15 provided on the outer periphery of the spool valve 9. A relief passage 16 provided in the main body 13 extends to the inner hole of the valve main body 11. A valve-closing holding spring 17 is housed between the guide member 2 and the end face of the spool valve 9 on the side of the valve-opening iron core 3, and presses the spool valve 9 toward the valve body 11 side, so that the relief passage 16 and the control line 15 match. Don't hold back. When the relief passage 16 and the control line 15 match, the fuel in the relief passage 16 can flow out into the low pressure chamber 14 through the center hole 10.

Next, the operation of the above configuration will be explained. When an exciting current is supplied from a control device (not shown) to the conductive coil 6 of the valve opening core 3, magnetic flux flows as shown by the dotted line in FIG. An attractive force acts in the axial direction to reduce the electromagnetic energy on the end face of the armature 7 facing the end face, that is, to bring the end face closer to the end face. Due to this suction force, the end of the spool 7l'9 fixed to the contactor 7
It moves toward the valve-opening iron core 3 side against the tension of the valve-closing holding spring 17, and the control f115 of the spool valve 9 coincides with the relief passage 16, so that the valve is in the open state. Therefore, fuel flows out into the low pressure chamber 14 via the fuel relief passage 16 and the center hole 10.

Next, when the supply of exciting current to the conductive coil 6 of the valve-opening core 3 is stopped and the exciting current is supplied to the conductive coil 6 of the valve-closing core 8, the magnetic flux changes as shown by the dotted line in FIG. As a result, an axial suction force acts between the end surface of the toothed portion 5 of the valve-closing core 8 and the end surface of the contactor 7. This suction force causes the spool valve 9 to move toward the valve body 11, resulting in a closed state in which the relief passage 16 and the control line 15 do not match. Therefore, fuel no longer flows out from the relief passage 16. Next, when the supply of excitation current to the conductive coil 6 of the valve closing iron core 8 is stopped, the valve closing state is maintained by the valve closing retaining spring 17.

In this way, the multi-electromagnetic valve of this embodiment is constructed by forming a plurality of grooves and tooth sections alternately on the flat surface of a plate with a comb-shaped iron core, and the end surfaces of each tooth section alternately have different magnetic poles. A conductive coil is wound around the groove so that the armature is formed into a flat plate, and the armature is arranged with a predetermined gap between the end face of the toothed part so as to be movable coaxially with respect to the axis that passes through the flat central part of the iron core. Therefore, the magnetic flux from each conductive coil is overlapped on the end face of the tooth profile of the iron core to generate multiple magnetic poles, and the armature is made into a thin disc-shaped armature expanded in the radial direction. The increase in weight of the armature can be suppressed and the suction force can be increased.Furthermore, the armature can be held open on both sides.

The valve-closing iron core is arranged so that the groove portion of one iron core is opposed to the toothed portion of the other iron core, so that a quick response can be obtained for both opening and closing of the valve.

〔Effect of the invention〕

As described above, the multi-pole 'f71m valve of the present invention has the effect of reducing the increase in the weight of the armature, increasing the suction force, and improving the operating characteristics of the valve.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of an embodiment of the magnetic valve according to the present invention when the cell is closed, Fig. 2 is an explanatory cross-sectional view taken along arrows -■ in Fig. 1, and Fig. 3 is a cross-sectional view of the magnetic valve in the open state. FIG. 1 is a sectional view of the same portion as in FIG. 3... Valve opening iron core, 4... Groove portion, 5... Tooth profile portion,
6...4 No. l Phantom procedural amendment (method) June 1985 2g

Claims (2)

[Claims] 1. A conductive coil is wound around an iron core made of a ferromagnetic material, and when the conductive coil is excited, an armature is attracted and a valve body fixed to the armature is opened and closed. The iron core has a plurality of grooves and teeth formed alternately on a flat surface of the plate, and the conductive coil is wound around the groove so that the end faces of the teeth alternately form different magnetic poles. and the armature, which is formed in a flat plate shape and is disposed so as to be movable coaxially with respect to an axis passing through the flat central part of the iron core, and is attached to the end face of the toothed part with a predetermined gap. A multi-pole solenoid valve featuring: 2. Claims in which the valve-opening and valve-opening iron cores are disposed on both sides of the armature, and the grooves of one of the iron cores are opposed to the toothed portions of the other iron core. The multi-pole solenoid valve according to item 1.