JP4937937B2 - Normally open type solenoid valve and normally closed type solenoid valve - Google Patents

Description

  The present invention belongs to the technical field of normally open solenoid valves and normally closed solenoid valves.

Japanese Patent Laid-Open No. 2004-228561 forms a concavo-convex shape on both the suction surfaces of the body member and the armature, and reduces the amount of magnetic flux passing between the suction surfaces when the distance between the suction surfaces is short. A technique for suppressing the above is disclosed.
JP 2005-155794 A

  However, in the above prior art, there is a problem in that the concave and convex shapes must be formed on both the suction surfaces of the armature and the body member, resulting in a complicated shape and an increase in cost.

  The present invention has been made paying attention to the above problems, and its purpose is to provide a normally open solenoid valve and a normal valve that can suppress changes in attractive force characteristics with respect to stroke while reducing costs by simplifying parts. The object is to provide a closed solenoid valve.

In the present invention, the cylinder disposed on the inner peripheral side of the coil yoke is formed of a non-magnetic material, and a cylindrical magnetic member is attached to the outer periphery of the body portion of the body member. The end portion is configured to overlap with a gap formed between the body member and the armature when the coil is not energized.

  Therefore, in the present invention, it is possible to suppress a change in the suction force characteristic with respect to the stroke while reducing the cost by simplifying the parts.

  Hereinafter, the best mode for realizing a normally open solenoid valve and a normally closed solenoid valve of the present invention will be described based on each embodiment shown in the drawings.

[Example 1]
First, the configuration will be described.
FIG. 1 is a longitudinal sectional view showing a configuration of a normally open solenoid valve A according to the first embodiment.
The normally open solenoid valve A according to the first embodiment is, for example, a brake hydraulic circuit such as an ABS (anti-skid brake system) that controls the braking force of an automobile to prevent the wheel from being locked, a hydraulic circuit of an automatic transmission, or the like. Is a linear solenoid valve used for opening and closing a predetermined oil passage.

The coil 1 is for generating an attractive force in the electromagnetic valve A, and forms a magnetic field when energized.
The coil yoke 2 is formed of a magnetic material (for example, iron: a ferromagnetic material constituting a magnetic circuit) that covers the periphery of the coil 1, and forms a magnetic path outside the coil.

The armature 3 is disposed on the inner peripheral side of the coil yoke 2 and is provided in the oil seal cylinder 8 so as to be movable in the axial direction. The armature 3 is made of a magnetic material (for example, iron: a ferromagnetic material constituting a magnetic circuit). The oil seal cylinder 8 is made of a nonmagnetic material.
The plunger 4 is provided integrally with the armature 3 and moves in the axial direction in an axial through hole 5 a formed in the body member 5.

  The body member 5 is formed of a magnetic material (for example, iron: a ferromagnetic material constituting a magnetic circuit), and is fixed to the valve housing 9. The body member 5 has a body portion 10 located on the inner periphery of the coil yoke 2. The body portion 10 is arranged with a predetermined gap (air gap) between the armature 3 and the axial direction when the coil 1 is not energized.

  A seat valve 11 is arranged in the axial through hole 5a of the body member 5 to perform a valve action by contact with and separation from the plunger 4. An axial oil passage 11a passes through the seat valve 11, and an orifice 11b is provided at the plunger side end. The shaft center oil passage 11 a communicates with an oil passage 9 a formed in the valve housing 9. A radial oil passage 5 b communicating with an oil passage 9 b formed in the valve housing 9 is formed on the side surface of the body member 5.

  The coil spring (elastic member) 6 is disposed in the axial through hole 5a and is interposed between the plunger 4 and the seat valve 11 in a compressed state, and attaches the plunger 4 in the direction of the armature 3, that is, in the valve opening direction. It is fast.

  The collar member 7 is disposed on the outer periphery of the body portion 10 of the body member 5, and is formed by cutting or pressing using a magnetic material (for example, iron: a ferromagnetic material constituting a magnetic circuit). The collar member 7 has a flange portion 12 and a cylindrical portion 13.

  FIG. 2 is an enlarged view of a main part of the solenoid valve A showing the configuration of the collar member 7, and the flange portion 12 is provided on the first end portion 13 a side of the cylindrical portion 13, and the coil yoke 2 and the valve housing 9 are arranged. Sandwiched between them.

  The cylindrical portion 13 is interposed between the coil 1 and the body portion 10 of the body member 5, and the second end portion 13 b opposite to the first end portion 13 a is connected to the armature 3 and the body portion when the coil 1 is not energized. 10 is overlapped in the axial direction.

Next, the effect of the solenoid valve A of Example 1 is demonstrated.
FIG. 3 is a diagram showing a magnetic field state when the coil is energized in the solenoid valve A. When the armature 3 is moved by energization of the coil 1, the second end portion 13 b of the collar member 7 is axially aligned with the armature 3. Overlap.

  For this reason, the larger the overlap amount, the more the magnetic flux lines passing through the armature 3 are directed to the collar member 7 and the number of magnetic flux lines flowing from the armature 3 to the body member 5 can be reduced. Therefore, as the air gap becomes smaller, the amount of decrease in magnetic flux lines (magnetic flux leakage amount) flowing from the armature 3 to the body member 5 increases.

  That is, by providing the collar member 7 that overlaps the armature 3 in the axial direction, the increase gradient of the suction force can be suppressed as the distance between the armature 3 and the body member 5 becomes shorter. Can be kept small.

  In general, in a solenoid valve, when a constant current is passed through a coil, the relationship between the stroke of the plunger and the attractive force is a curve as shown by a broken line in FIG. Here, in the normally open type solenoid valve, the stroke is maximum when the coil is not energized and the stroke is minimum when the coil is energized (the opposite is true for the normally closed solenoid valve). That is, in the normally open type solenoid valve, the attractive force has a characteristic that the smaller the stroke, that is, the larger the air gap between the armature and the body member, the larger the attractive force (because the magnetic force is inversely proportional to the square of the distance). ).

  Here, when the electromagnetic valve is used as a hydraulic control valve, it is desirable from the viewpoint of hydraulic controllability that the movement displacement of the armature changes in proportion to the current supplied to the coil within the stroke range of the plunger. In other words, a flat attractive force characteristic that is not affected by the armature stroke under a constant current is ideal.

Therefore, in the conventional solenoid valve, an uneven shape is formed on the suction surface (opposite surface) of the armature and body member, and by increasing the magnetic flux lines that do not pass through the suction surface when the coil is energized, the change in the attractive force characteristics with respect to the stroke Suppressed. The alternate long and short dash line in FIG. 4 shows the suction force characteristic with respect to the stroke when the uneven surface is provided with the uneven shape, and the change in the suction force characteristic with respect to the stroke is further suppressed as compared with the wavy line without the uneven shape.
However, when the concave and convex shape is provided on the suction surface, the shapes of the armature and the body member are complicated, resulting in an increase in cost.

  On the other hand, in the electromagnetic valve A of the first embodiment, the cylindrical collar member 7 is mounted on the outer periphery of the body portion 10 of the body member 5 and the second end portion 13b of the collar member 7 is connected to the coil 1 when the coil 1 is not energized. The gap formed between the body member 5 and the armature 3 was overlapped in the axial direction. That is, the second end portion 13b of the collar member 7 is disposed so as to overlap the armature 3 in the axial direction when the coil is energized.

  As a result, as shown by a solid line in FIG. 4, it is possible to suppress the change in the suction force characteristic with respect to the stroke and improve the controllability. Moreover, compared with the prior art which formed the uneven | corrugated shape in the suction surface, simplification of components can be achieved and manufacturing cost can be held down.

  In addition, since the solenoid valve A has the collar member 7 interposed in the gap (side gap) between the coil 1 and the body portion 10, the magnetic resistance of the magnetic circuit is kept small, and the amount of magnetic flux on the magnetic circuit Can be increased. Therefore, as is apparent from FIG. 4, the attractive force when a constant current is passed through the coil 1 is greater than that of the conventional solenoid valve regardless of the stroke, and the attractive efficiency can be increased.

[Example 2]
FIG. 5 is a longitudinal sectional view showing the configuration of the normally open solenoid valve B of the second embodiment.
In the normally open solenoid valve B of the second embodiment, a coil yoke that covers the periphery of the coil 1 is constituted by two members, a first yoke member 14 and a second yoke member 15. The first yoke member 14 and the second yoke member 15 are made of a magnetic material.

  A burring portion 16 is formed on the inner periphery of the second yoke 15 member so as to cover the outer periphery of the body portion 10 of the body member 5. The end 16a of the burring portion 16 overlaps the gap formed between the body member 5 and the armature 3 in the axial direction when the coil 1 is not energized, like the collar member 7 of the first embodiment. Yes. Other configurations are the same as those in the first embodiment.

  As described above, in the solenoid valve B of the second embodiment, the end 16a of the burring portion 16 of the coil yoke (second yoke member 15) overlaps the armature 3 in the axial direction when the coil is energized. Changes in characteristics can be suppressed and controllability can be improved. Moreover, compared with the prior art which formed the uneven | corrugated shape in the suction surface, simplification of components can be achieved and manufacturing cost can be held down. Furthermore, the suction efficiency can be increased.

[Example 3]
FIG. 6 is a longitudinal sectional view showing the configuration of the normally closed solenoid valve C of the third embodiment.
The coil 21 is for generating an attractive force in the electromagnetic valve C, and forms a magnetic field when energized.
The coil yoke 22 is formed of a magnetic material that covers the periphery of the coil 21 and forms a magnetic path outside the coil.

  The armature 23 is disposed on the inner peripheral side of the coil yoke 22 and is provided in the oil seal cylinder 30 so as to be movable in the axial direction. The armature 23 is made of a magnetic material. The oil seal cylinder 30 is made of a nonmagnetic material.

  The body center 24 is made of a magnetic material (for example, iron: a ferromagnetic material constituting a magnetic circuit). The body center 24 is disposed with a predetermined air gap between the armature 23 and the armature 23 when the coil 1 is not energized.

  A part of the coil spring (elastic member) 25 is housed in a recess 23 a formed on the body center side of the armature 23, and is interposed between the armature 23 and the body center 24 in a compressed state. The coil spring 25 urges the armature 23 away from the body center 24, that is, in the valve closing direction.

  The seat portion 26 has an axial oil passage 26a extending in the axial direction, and an orifice 26b is provided at the armature side end thereof. The shaft center oil passage 26 a communicates with an oil passage 29 a formed in the valve housing 29.

  The ball valve body 27 has a spherical shape that is assembled as a valve portion of the armature 23, and performs a valve action by contacting and separating from the seat portion 26. The ball valve body 27 is made of, for example, a nonmagnetic material having a Rockwell hardness of about 60 to 65.

  The seat body 28 fits and supports the seat portion 26 therein. The seat body 28 is made of a magnetic material. An oil passage 29 b is formed on a side surface of the seat body of the valve housing 29. The oil passage 29 b communicates with the space between the armature 23 and the seat body 28.

  The collar member 31 is disposed on the outer periphery of the body center 24, and is formed by cutting or pressing using a magnetic material (for example, iron: a ferromagnetic material constituting a magnetic circuit). The collar member 31 has a flange portion 32 and a cylindrical portion 33.

  FIG. 7 is an enlarged view of the main part of the solenoid valve C showing the configuration of the collar member 31, and the flange portion 32 is provided on the first end portion 33 a side of the cylindrical portion 33, and is welded and press-fitted with the coil yoke 22. It is fixed.

  The cylindrical portion 33 is interposed between the coil 21 and the body center 24, and the second end portion 33 b opposite to the first end portion 33 a is between the armature 23 and the body center 24 when the coil 21 is not energized. Are overlapping in the axial direction.

  Thus, in the solenoid valve C of the third embodiment, the cylindrical collar member 31 is mounted on the outer periphery of the body center 24, and the second end 33b of the collar member 31 is connected to the body center 24 when the coil 21 is not energized. The gap formed between the armature 23 and the armature 23 was overlapped in the axial direction. That is, the second end portion 33b of the collar member 31 is disposed so as to overlap the armature 23 in the axial direction when the coil is energized.

  Thereby, like Example 1, since the number of magnetic fluxes which do not contribute to attractive force increases, so that overlap amount is large, the change of the attractive force characteristic with respect to a stroke can be suppressed, and controllability can be improved. Moreover, compared with the prior art which formed the uneven | corrugated shape in the suction surface, simplification of components can be achieved and manufacturing cost can be held down.

  In addition, since the solenoid valve C has the collar member 31 interposed in the space between the coil 21 and the body center 24, the magnetic resistance of the magnetic circuit can be kept small, and the amount of magnetic flux on the magnetic circuit can be increased. The suction efficiency can be improved.

[Example 4]
FIG. 8 is a longitudinal sectional view showing the configuration of the normally closed solenoid valve D of the fourth embodiment.
In the normally closed solenoid valve D of the fourth embodiment, a coil yoke that covers the periphery of the coil 1 is configured by two members, a first yoke member 41 and a second yoke member 42. The first yoke member 41 and the second yoke member 42 are made of a magnetic material.

  A burring portion 43 that covers the outer periphery of the body center 24 by burring is formed on the inner periphery of the second yoke 42 member. The end 43a of the burring portion 43 overlaps the gap formed between the body center 24 and the armature 23 in the axial direction when the coil 1 is not energized, like the collar member 31 of the third embodiment. Yes. Other configurations are the same as those in the first embodiment.

  Thus, in the solenoid valve D of the fourth embodiment, the end 43a of the burring portion 43 of the coil yoke (second yoke member 42) is overlapped in the axial direction with the armature 23 when the coil is energized. Changes in characteristics can be suppressed and controllability can be improved. Moreover, compared with the prior art which formed the uneven | corrugated shape in the suction surface, simplification of components can be achieved and manufacturing cost can be held down. Furthermore, the suction efficiency can be increased.

[Example 5]
FIG. 9 is a longitudinal sectional view showing the configuration of the normally open solenoid valve E of the fifth embodiment.
The fifth embodiment is different from the first embodiment only in the shape of the collar member.
The collar member 51 of the fifth embodiment is fixed to the outer periphery of the body portion 10 of the body member 5 by press-fitting or welding, and has an enlarged diameter portion 52a formed at the tip of an oil seal cylinder 52 that houses the body portion 10 and the armature 3. It is installed between.

  The color member 51 is made of a magnetic material and is formed in a cylindrical shape by cutting or pressing. The collar member 51 has a first end portion 51a and a second end portion 51b, and the second end portion 51b is against a gap formed between the armature 3 and the trunk portion 10 when the coil 1 is not energized. , Overlap in the axial direction.

  Thus, in the solenoid valve E of the fifth embodiment, the cylindrical collar member 51 is mounted on the outer periphery of the body portion 10 of the body member 5 and the second end portion 51b of the collar member 51 is connected to the coil 1 when the coil 1 is not energized. The gap formed between the body member 5 and the armature 3 was overlapped in the axial direction. That is, the second end portion 51b of the collar member 51 is disposed so as to overlap the armature 3 in the axial direction when the coil is energized.

  Thereby, the change of the attraction | suction force characteristic with respect to a stroke can be suppressed, and controllability can be improved. Moreover, compared with the prior art which formed the uneven | corrugated shape in the suction surface, simplification of components can be achieved and manufacturing cost can be suppressed. Furthermore, the suction efficiency can be increased.

[Example 6]
FIG. 10 is a longitudinal sectional view showing the configuration of the normally open solenoid valve F of the sixth embodiment.
The sixth embodiment is different from the first embodiment only in the shape of the collar member.
The collar member 61 of Example 6 is press-fitted or insert-molded on the outer periphery of the body portion 10 of the body member 5 and on the inner periphery of the bobbin 64 of the coil 1. The collar member 61 is formed by cutting or pressing using a magnetic material. The collar member 61 has a flange portion 62 and a cylindrical portion 63.

The flange portion 62 is provided on the first end portion 63 a side of the cylindrical portion 63. The flange portion 62 is fitted into a recess 64 a formed in the bobbin 64 and is sandwiched between the bobbin 64 and the coil yoke 2.
The cylindrical portion 63 is interposed between the coil 1 and the body portion 10 of the body member 5, and the second end portion 63 b opposite to the first end portion 63 a is connected to the armature 3 and the body portion when the coil 1 is not energized. 10 is overlapped in the axial direction.

  As described above, in the electromagnetic valve F of the sixth embodiment, the cylindrical collar member 61 is mounted on the outer periphery of the body portion 10 of the body member 5, and the second end 63 b of the collar member 61 is connected to the coil 1 when the coil 1 is not energized. The gap formed between the body member 5 and the armature 3 was overlapped in the axial direction. That is, the second end 63b of the collar member 61 is arranged so as to overlap the armature 3 in the axial direction when the coil is energized.

  Thereby, the change of the attraction | suction force characteristic with respect to a stroke can be suppressed, and controllability can be improved. Moreover, compared with the prior art which formed the uneven | corrugated shape in the suction surface, simplification of components can be achieved and manufacturing cost can be held down. Furthermore, the suction efficiency can be increased.

(Other examples)
The best mode for carrying out the present invention has been described based on each embodiment. However, the specific configuration of the present invention is not limited to the configuration shown in the embodiment, and the gist of the invention is described. Any design change or the like within a range that does not deviate from the above is included in the present invention.

For example, the collar member may have any shape that overlaps the armature when the armature is actuated when the coil is energized.
The elastic member is not limited to a coil spring, and a leaf spring or the like may be used.

1 is a longitudinal sectional view showing a configuration of a normally open solenoid valve A of Example 1. FIG. 3 is an enlarged view of a main part of a solenoid valve A showing a configuration of a collar member 7 of Example 1. FIG. 3 is a diagram showing a magnetic field state when a coil is energized in a solenoid valve A. FIG. It is an attraction force characteristic diagram with respect to the stroke of a solenoid valve. 6 is a longitudinal sectional view showing a configuration of a normally open solenoid valve B of Example 2. FIG. 6 is a longitudinal sectional view showing a configuration of a normally closed solenoid valve C of Example 3. FIG. FIG. 6 is an enlarged view of a main part of a solenoid valve C showing a configuration of a collar member 31 of Example 3. 6 is a longitudinal sectional view showing a configuration of a normally closed solenoid valve D of Example 4. FIG. 10 is a longitudinal sectional view showing a configuration of a normally open solenoid valve E of Example 5. FIG. 10 is a longitudinal sectional view showing a configuration of a normally open solenoid valve F of Example 6. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coil 2 Coil yoke 3 Armature 4 Plunger 5 Body member 6 Coil spring (elastic member)
7 Collar member 9 Valve housing 13b Second end 15 Second yoke member (coil yoke)
16 Burring portion 16a End portion 21 Coil 22 Coil yoke 23 Armature 24 Body center 25 Coil spring (elastic member)
31 Collar member 33b Second end 42 Second yoke member (coil yoke)
43 Burring portion 43a End portion 51 Color member 51b Second end portion 61 Color member 63b Second end portion

Claims (2)

A coil that forms a magnetic field when energized;
A coil yoke made of a magnetic material for housing the coil;
A magnetic armature that is movable when the coil is energized in a cylinder disposed on the inner peripheral side of the coil yoke;
A plunger actuated by movement of the armature;
A body member of a magnetic material having a barrel located on the inner periphery of predetermined said coil yoke is disposed with a gap between said armature when not energized the coil within the cylinder,
An elastic member for urging the plunger in the direction of the armature;
In a normally open type solenoid valve equipped with
The cylinder is formed of a non-magnetic material;
A normally open solenoid valve characterized in that a cylindrical magnetic collar member is mounted on an outer periphery of a body portion of the body member, and an end portion of the collar member is overlapped with the gap. The normally open solenoid valve according to claim 1,
The normally open solenoid valve according to claim 1, wherein an end of the collar member overlaps the armature when the armature is moved.

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