JP2001082623A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide. a solenoid valve excellent in responsiveness of a movable core, easy to work a yoke and low in manufacturing cost. SOLUTION: This solenoid valve is furnished with a movable core 4 to be connected to a valve element 20 to work to open and close, a yoke 5 to constitute a magnetic path with this movable core 4 and an electromagnetic coil 1 to magnetize the movable core 4 and yoke 5. The yoke 5 is furnished with a pair of holding pieces 25, 26 to hold the electromagnetic coil 1 by confronting both end sides of the electromagnetic coil 1 and a connecting base end part 27 to connect this pair of the holding pieces 25, 26 on its base end side to each other. At least one of the holding pieces 25, 26 of the yoke 5 is formed thicker than the connecting base end part 27 by piling it up by folding its head end side back.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve suitable for use in an antilock brake device for controlling brake fluid pressure for a vehicle.

[0002]

2. Description of the Related Art An electromagnetic valve of this type includes a movable core connected to a valve element that opens and closes, a yoke that forms a magnetic path together with the movable core, and an electromagnetic coil that magnetizes the movable core and the yoke. ing.

The yoke is formed by plastically processing (pressing or the like) a plate member made of a conductive metal material, and a pair of holding pieces facing both ends of the electromagnetic coil, and a pair of the holding pieces. And a connection base end portion that connects the base members to each other on the base end side, and the electromagnetic coil is arranged between the pair of holding pieces. A similar configuration is disclosed in, for example, Japanese Patent Application Laid-Open No. 58-28077,
285114.

[0004]

In the conventional solenoid valve, it is effective to increase the area of the magnetic path in order to increase the response of the movable core, and the magnetic path is formed at both ends of the electromagnetic coil. It is conceivable to increase the thickness of the yoke.

However, the yoke of the prior art is formed by plastically processing a metal plate member. If the thickness of the plate is increased, the processing becomes difficult and the production cost may increase.

The present invention has been devised in view of the above-mentioned conventional circumstances, and has as its object to provide a solenoid valve which is excellent in responsiveness of a movable core, can easily process a yoke, and is inexpensive to manufacture. I do.

[0007]

SUMMARY OF THE INVENTION In view of the above, the present invention is directed to a movable core connected to a valve element that opens and closes, a yoke forming a magnetic path together with the movable core, and a movable core and a yoke. In a solenoid valve having an electromagnetic coil that is magnetized, the yoke includes a pair of holding pieces facing both ends of the electromagnetic coil, and a connection base end that connects the pair of holding pieces to each other at a base end thereof. At least one of the holding pieces of the yoke is formed to be thicker than the connection base end by overlapping the top end by folding back.

According to a second aspect of the present invention, in the configuration of the first aspect, at least one of the holding pieces of the yoke is arranged on the holding piece side where the folded piece faces.

According to a third aspect of the present invention, in the configuration of the first aspect, a plurality of electromagnetic coils are arranged in parallel between a pair of holding pieces by integrally connecting the plurality of yokes. It is arranged so that a plurality of solenoid valves are arranged.

The yoke is formed by plastically processing a plate member made of a conductive metal material.

In such a configuration, the movable core is driven by energizing and de-energizing the electromagnetic coil. Specifically, a magnetic path is formed between the electromagnetic coil, the yoke, and the movable core by exciting the electromagnetic coil with a DC or AC current, and the movable core is attracted and driven from the reference position. Further, by stopping the power supply to the electromagnetic coil, the magnetic path disappears, and the movable core is returned to the reference position.

Since a valve element is connected to the movable core, the valve element is driven by driving the movable core, and the valve element is opened and closed.

[0013] Here, at least one of the holding pieces of the yoke is overlapped by folding back the front end side,
It is formed thicker than the connection base end. That is, since the holding piece is folded back at the tip end, the thickness is substantially increased by the thickness of the folded piece.

Accordingly, the thickness of the yokes constituting the magnetic path at both ends of the electromagnetic coil is substantially increased, so that the magnetic flux density is increased and the responsiveness of the movable core is easily increased.

Here, in the yoke, although the holding pieces constituting the magnetic path are substantially thick at both ends of the electromagnetic coil, the holding pieces are bent at the ends, and the thickness of the folded pieces is reduced. It is thicker by the minute. That is,
The thickness of the metal plate member forming the yoke remains thin as a whole.

Therefore, the yoke can be easily plastically worked from a metal plate member.

Therefore, a solenoid valve which is excellent in responsiveness of the movable core, can be easily processed in the yoke, and has a low manufacturing cost can be obtained.

In addition, since the front end of the holding piece is folded back, the front end is formed into an arc shape by the folding. For this reason, when inserting and assembling the electromagnetic coil between the holding pieces, the electromagnetic coil is guided in an arc shape on the distal end side of the holding piece, so that the operation of inserting and assembling the electromagnetic coil can be easily performed.

According to the second aspect of the present invention, since at least one of the holding pieces of the yoke is disposed on the side of the holding piece opposite to the folded piece, the bending stress at the time of folding remains and the folded piece is folded. When the piece springs back, it is possible to easily temporarily lock the electromagnetic coil between the holding pieces by using the springback.

According to the third aspect of the present invention, the plurality of yokes are integrally connected, so that a plurality of electromagnetic coils are arranged in parallel between a pair of holding pieces, and a plurality of electromagnetic valves are assembled. By doing so, it can be advantageously applied to an antilock brake device or the like of an automobile that requires a plurality of solenoid valves.

[0021]

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

FIG. 1 is a sectional view of an electromagnetic valve showing an embodiment of the present invention, FIG. 2 is a perspective view of a yoke shown in FIG. 1, and FIG.
FIG. 4 is a diagram illustrating a state in which the electromagnetic coil shown in FIG.

In the figure, 1 is a cylindrical electromagnetic coil, 2
A fixed core fixed to one end (upper side in FIG. 1) of the cylinder 2; a movable core slidably accommodated in the cylinder 2; Reference numeral 5 denotes a yoke that forms a magnetic path together with the movable core.

The electromagnetic coil 1 comprises a coil section 10 and a coil holding section 11, and is formed in a cylindrical shape as a whole. Further, a connection terminal 12 connected to the conductor of the coil unit 10 is provided, and the connection terminal 12 is connected to a control device (not shown).

The cylinder 2 is made of a non-magnetic material and is formed in a cylindrical shape with both ends open. A fixed core 3 is fixed to one end (upper side in FIG. 1) and the other end (lower side in FIG. 1). The valve seat member 15 is fixed.

The fixed core 3 is made of a conductive metal material and has a blind hole 1 opening toward the movable core 4.
7. A spring member 18 is housed in the blind hole 17, and the spring member 18 urges the movable core 4 toward the valve seat member 15.

The movable core 4 is made of a conductive metal material, is slidably accommodated in the cylinder 2, and is connected to a valve 20 that opens and closes. The inside of the cylinder on the fixed core 3 side and the inside of the cylinder on the valve seat member 15 side defined by the movable core 4 communicate with each other around the trunk portion of the movable core 4 so that the movable core 4 is An axial groove 21 is formed to enable smooth sliding. In addition, the valve element 2 linked to the movable core 4
Numeral 0 extends inside the valve seat member 15 so that a valve hole (not shown) provided in the valve seat member 15 can be opened and closed.

The yoke 5 is formed by plastically processing a plate member made of a conductive metal material, and a pair of holding pieces 25 and 26 facing both ends of the electromagnetic coil 1.
And a connecting base 27 for connecting the pair of holding pieces 25 and 26 to each other on the base end side. That is,
The yoke 5 has a substantially U-shaped cross section. A pair of holding pieces 25 and 26 can hold both ends of the electromagnetic coil 1 between the holding pieces 25 and 26.

In this embodiment, at least one of the holding pieces 25 and 26 of the yoke 5 is formed so as to be overlapped by folding back the distal end side so as to be thicker than the connecting base end 27. Thereby, the holding piece 2
The tips of 5, 26 are formed in an arc shape. Further, at least one of the holding pieces 25 and 26 of the yoke 5, in this embodiment, both of them are the folded pieces 2.
5A and 26A are arranged on the side of the opposing holding pieces 25 and 26, respectively. That is, the folded pieces 25A, 26
A is arranged inside the U-shaped cross section.

Holding holes 28 and 29 are formed in each of the pair of holding pieces 25 and 26 of the yoke 5, and a part of the fixed core 3 of the electromagnetic coil 1 is inserted into the holding holes 28. The part of the cylinder 2 of the electromagnetic coil 1 is inserted into the holding hole 29.
Thereby, a pair of holding pieces 25 and 26 of the yoke 5 are formed.
The electromagnetic coil 1 is held in a state where a part of the fixed core 3 is inserted into the holding hole 28 and a part of the cylinder 2 is inserted into the holding hole 29.

The holding piece 25 is formed with an insertion slit 30 which is opened at the tip of the holding piece 25 and ends at the connecting base 27 through the holding hole 27. The insertion slit 30 allows the electromagnetic coil 1 to pass through the connection terminal 12 when the electromagnetic coil 1 is inserted between the holding pieces 25 and 26, and the electromagnetic coil 1 is held between the holding pieces 25 and 26. In this state, the connection terminals 12 are arranged so as to pass through the slit 30.

In this embodiment, a plurality of the holding holes 28 and 29 are formed in a pair of holding pieces 25 and 26, respectively (see FIG. 2). That is, a plurality of the yokes 5 are integrally connected, whereby a plurality of electromagnetic coils 1 are provided between the pair of holding pieces 25 and 26.
Are arranged in parallel, and a plurality of solenoid valves can be assembled.

In the yoke 5, adjacent holding holes 28, 2
9, separation slits 31, 32, and 33 are formed. That is, in the holding piece 25, between the adjacent holding holes 28,
A slit 31 is formed on the tip side of the holding piece 25, and a slit 32 is formed on the holding piece 26 between the adjacent holding holes 29, opening on the tip side of the holding piece 26. Further, a slit 33 is formed at the connection base end 27 on the opposite side of the slits 31 and 32, and ends at both ends with holding pieces 25 and 26, respectively. The slit, 31, 3
2, 33, when a plurality of electromagnetic coils 1 are arranged on the yoke 5, prevents leakage of magnetic flux between individual magnetic paths formed via the plurality of connected yokes 5. ing.

Reference numeral 35 denotes a housing to which the valve seat member 15 is attached, and reference numeral 36 denotes a seal member provided between the valve seat member 15 and the housing 35.

The assembling of the solenoid valve having such a configuration is performed as follows.

First, the cylinder 2, the fixed core 3, the movable core 4, the valve seat member 15, the spring member 18, and the valve body 20 are unitized. In this unitized state, the valve seat member 1
5 is attached to the housing 35. At this time, a seal member 36 is disposed between the valve seat member 15 and the housing 35, and sealing is performed.

Next, the electromagnetic coil 1 is attached to the yoke 5. The assembly of the electromagnetic coil 1 to the yoke 5 is described in FIG.
As shown in FIG.
26 is inserted from the distal end side toward the connection base end portion 27 side. At this time, the connection terminal 12 of the electromagnetic coil 1 is inserted from the opening end of the insertion slit 30 that opens on the tip side of the holding piece 25, and the insertion slit 3
0. Also, holding holes 28,
29 and are aligned concentrically.

When the electromagnetic coil 1 is mounted on the yoke 5, the tips of the holding pieces 25 and 26 of the yoke 5 are formed in an arc shape, so that the electromagnetic coil 1 is attached to the holding pieces 25 and 26.
It is guided in an arc shape on the distal end side of the device and is easily inserted and assembled. Further, since the folded pieces 25A, 26A of the holding pieces 25, 26 of the yoke 5 are arranged on the facing holding pieces 25, 26 side, bending stress at the time of folding remains, and the folded pieces 25A, 26A become springs. In the case of backing, it is possible to easily temporarily lock the electromagnetic coil 1 between the holding pieces 25 and 26 using this spring back.

Next, with the electromagnetic coil 1 mounted on the yoke 5, this is inserted into the outer periphery of the fixed core 3 and the cylinder 2, and the holding hole 2 formed in the holding piece 25 of the yoke 5 is formed.
A part of the fixed core 3 is located in the inside 8, and a part of the cylinder 2 is located in the cylindrical inside of the electromagnetic coil 1 and the holding hole 29 formed in the holding piece 26. Thereafter, the yoke 5 is fixed to the housing 35 by an appropriate method.

In such a configuration, under the control of a control device (not shown) connected to the connection terminal 12 of the electromagnetic coil 1, energization and de-energization of the electromagnetic coil 1 allow the movable core 4 to move. Driven. More specifically, a magnetic path is formed between the electromagnetic coil 1, the yoke 5, the movable core 4, and the fixed core 3 by exciting the electromagnetic coil 1 with a DC or AC current, and the movable core 4 is
8 is driven toward the fixed core 3 from the reference position (see FIG. 1) against the spring force of No. 8. By stopping the power supply to the electromagnetic coil 1, the magnetic path disappears, and the movable core 4
Is pushed back to the valve seat member 15 side, that is, to the reference position by the spring force of the spring member 18.

Since the movable core 4 is connected to the valve body 20, the movable core 4 is driven to
0 is driven to open and close.

Here, the holding pieces 25 and 26 of the yoke 5
In this embodiment, at least one of them is formed to be thicker than the connection base end portion 27 by overlapping the front end side by folding it back. That is, the holding piece 2
Since the front ends of the pieces 5 and 26 are folded, the thickness is substantially increased by the thickness of the folded pieces 25A and 26A.

As a result, the thickness of the yoke 5 constituting the magnetic path at both ends of the electromagnetic coil 1 is substantially increased.
The magnetic flux density increases, and the responsiveness of the movable core 4 can be easily increased.

Here, in the yoke 5, although the holding pieces 25 and 26 forming the magnetic path are substantially thick at both ends of the electromagnetic coil 1, the holding pieces 25 and 26 are bent at the tip ends. The thickness is increased by the thickness of the folded pieces 25A and 26A. That is, the thickness of the metal plate member forming the yoke 5 remains thin as a whole.

Therefore, the yoke 5 can be easily plastically processed from a metal plate member.

Accordingly, a solenoid valve having excellent responsiveness of the movable core 4 and easy processing of the yoke 5 can be obtained at a low manufacturing cost.

In addition, since the leading ends of the holding pieces 25 and 26 are folded, the leading ends are formed in an arc shape by the folding. For this reason, when the electromagnetic coil 1 is inserted and assembled between the holding pieces 25 and 26, the electromagnetic coil 1 is guided in an arc shape on the tip side of the holding pieces 25 and 26. Mounting work can be performed easily.

The holding pieces 25, 26 of the yoke 5
Are the holding pieces 25 whose folded pieces 25A and 26A face each other,
Since it is arranged on the side 26, when the bending stress at the time of folding remains and the folded pieces 25A and 26A spring back, the electromagnetic coil 1 is moved between the holding pieces 25 and 26 by using this spring back. Temporary locking can be easily performed.

The plurality of yokes 5 are integrally connected, so that a plurality of electromagnetic coils 1 are arranged in parallel between a pair of holding pieces 25 and 26, and a plurality of electromagnetic valves are assembled. Thus, the present invention can be advantageously applied to an anti-lock brake device of an automobile that requires a plurality of solenoid valves.

FIGS. 4 and 5 show another embodiment of the present invention. The difference between this embodiment and the above embodiment is the shape of the holding pieces 25 and 26 of the yoke 5. FIG.

That is, at least one of the holding pieces 25, 26 of the yoke 5, and in this embodiment, both of them, the folded pieces 25A, 26A are arranged on the opposite sides of the holding pieces 25, 26, respectively. That is, the folded pieces 25A and 26A are arranged outside the U-shaped cross section. Since other configurations are the same as those of the above-described embodiment, the same components are denoted by the same reference numerals, and redundant description will be omitted.

Also in this configuration, at least one of the holding pieces 25 and 26 of the yoke 5, in this embodiment, both are formed to be thicker than the connection base end 27 by overlapping the front end by folding back. Therefore, substantially the same operation and effect as those of the above embodiment can be obtained.

Although the embodiment has been described with reference to the drawings, the specific configuration is not limited to this embodiment and can be changed without departing from the spirit of the invention.
For example, the electromagnetic valve in which the fixed core 3 is disposed above the movable core 4 and the movable core 4 is attracted and driven upward by excitation of the electromagnetic coil 1 has been described, but the present invention is not limited thereto. May be arranged below the movable core 4 so that the movable core 4 is attracted and driven downward by the excitation of the electromagnetic coil 1.

[0054]

As described in detail above, according to the present invention, a solenoid valve having excellent responsiveness of the movable core, easy processing of the yoke, and low production cost can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a solenoid valve according to an embodiment of the present invention.

FIG. 2 is a perspective view of the yoke shown in FIG.

FIG. 3 is a view for explaining a state in which the electromagnetic coil shown in FIG. 1 is assembled to a yoke.

FIG. 4 is a drawing similar to FIG. 1, showing another embodiment of the present invention.

FIG. 5 is a perspective view of the yoke shown in FIG.

[Explanation of symbols]

 Reference Signs List 1 electromagnetic coil 4 movable core 5 yoke 20 valve body 25 holding piece 26 holding piece 27 connection base end

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H106 DA07 DA23 DA32 DB02 DB12 DB23 DB32 DD03 EE04 EE35 GA11 GB01 GC26 JJ02 JJ06 KK22

Claims (3)

[Claims] 1. A solenoid valve comprising: a movable core connected to a valve element that opens and closes; a yoke that forms a magnetic path together with the movable core; and an electromagnetic coil that magnetizes the movable core and the yoke. Consists of a pair of holding pieces opposed to both ends of the electromagnetic coil, and a connecting base end for connecting the pair of holding pieces to each other at a base end thereof, and at least one of the holding pieces of the yoke has a tip. An electromagnetic valve, characterized in that it is formed to be thicker than a connecting base end portion by folding the sides to overlap each other. 2. The solenoid valve according to claim 1, wherein at least one of the holding pieces of the yoke is arranged on a side of the holding piece where the folded pieces face each other. 3. A plurality of yokes are integrally connected, a plurality of electromagnetic coils are arranged in parallel between a pair of holding pieces, and a plurality of electromagnetic valves are assembled. The solenoid valve according to claim 1.