JP2001304447A - Electromagnetic actuator device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic actuator device capable of contributing to the improvement of the attraction force for attracting a movable iron core. SOLUTION: This electromagnetic actuator device comprises a fixed iron core 3 having a attraction face 34 and a straight inner wall face 70 extended along the axial direction, a movable iron core 4 having a straight outer wall face 42 extended along the straight inner wall face 70, a valve element 52 as an actuator part in interlocking with the movable iron core 4, and a ring-shaped non-magnetic part 8 formed on the fixed iron core 3. An axial length of the non-magnetic part 8 is determined within a range of 0.5-5.0 mm. A region to a basic part 31 side of the fixed iron core 3 with respect to a 0-point which is an axial length position of an end 42r of the straight outer wall face 42 of the movable iron core 4, is regarded as a negative (-) region, and a region at a side separated from the basic part 31 side of the fixed iron core 3 with respect to the 0-point is regarded as a positive (+) region. A position of a starting end 8s of the non-magnetic part 8 is determined within a range of -1.4 mm through +0.5 mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement in an electromagnetic actuator device such as an electromagnetic valve.

[0002]

2. Description of the Related Art As an electromagnetic actuator device, a casing, a fixed iron core disposed in a casing and having a storage chamber, and a movable iron core disposed in the storage chamber of the fixed iron core so as to be movable in the axial direction. There is also known an apparatus including an actuator unit connected to a movable iron core so as to interlock with the movable iron core, and an excitation coil unit. When the excitation coil section is energized, a magnetic flux that passes through the fixed iron core and the movable iron core is generated, whereby the movable iron core is attracted to the suction surface of the fixed iron core. As a result, the movable iron core moves in the suction direction, and the actuator unit operates in conjunction with the movable iron core. When the excitation coil is turned off, the suction of the movable iron core with respect to the suction surface of the fixed iron core is released, and the operation of the actuator unit is switched. As described above, the electromagnetic actuator device is widely used in the industry because the actuator section can be operated in association with the suction of the movable iron core.

Further, in recent years, while irradiating a fixed iron core with a laser beam, a Ni-based wire is applied to an irradiated portion to produce austenitic stainless steel in a molten state along a circumferential direction of the fixed iron core. An electromagnetic actuator device in which a ring-shaped non-magnetic portion is formed by coagulating a solid has been developed (for example, JP-A-07-189852). FIG. 5 schematically shows the concept of the main part of this electromagnetic actuator device. As shown in FIG.
The non-magnetic portion 800 formed by melt solidification has a start end 800s and an end end 800f in the axial direction. According to the above-described electromagnetic actuator device, an appropriate magnetic path for attracting the movable iron core 400 is formed by the nonmagnetic portion 800.
It is said to be formed by In this embodiment, an air gap 900 is formed between the non-magnetic part 800 and the movable iron core 400 so as to face the non-magnetic part 800.
The axial length of the air gap 900 is 800 s at the beginning and 80 at the end.
The axis length is set to be larger than 0f. The above-mentioned publication describes that even if the formation position of the non-magnetic portion 800 is shifted in the axial direction, the air gap 900 can suppress the magnetic flux leakage in the radial direction.

[0004]

In the industry, in order to further enhance the usefulness of the above-described electromagnetic actuator device, the operating force of the electromagnetic actuator device is improved, that is, the suction force for sucking the movable iron core is further improved. Has been requested.

The present invention has been made in view of the above circumstances, and has as its object to provide an electromagnetic actuator device that can contribute to a further improvement in a suction force for sucking a movable iron core.

[0006]

SUMMARY OF THE INVENTION Based on the above-mentioned problems, the present inventor has been diligently developing the electromagnetic actuator device so as to further improve the suction force for sucking the movable iron core. The inventor sets the axial length of the non-magnetic portion in the range of 0.5 mm to 5.0 mm, and sets the end of the straight outer wall surface of the movable iron core closer to the base side of the fixed iron core. The axial length position is set to 0 point, the area closer to the base side of the fixed iron core than the 0 point is set as a negative (-) area, and the area further away from the base side of the fixed iron core than the 0 point is set as the negative area. When a positive (+) region is set, and the end of the non-magnetic portion that is closer to the base of the fixed iron core is set as the starting end, the position of the starting end of the non-magnetic portion is set to −
If it is set within the range of 1.4 mm to +0.5 mm, FIG.
As shown in the graph shown in FIG. 1, it was found that the suction force exhibited a critical characteristic, and based on the critical characteristic, the electromagnetic actuator device according to the present invention was completed.

That is, an electromagnetic actuator device according to the present invention includes a casing, a base disposed in the casing and having a suction surface extending in a direction perpendicular to the axis, and extending along the axial direction so as to surround the suction surface. A fixed iron core having a straight inner wall extending coaxially with the center axis and a cylindrical portion having a storage chamber defined by the straight inner wall; The fixed iron core has a straight outer wall surface extending along the straight inner wall surface of the tubular portion of the fixed iron core and is attracted to the suction surface side of the base of the fixed iron core. A movable iron core, an actuator portion connected to the movable iron core and connected to the movable iron core, an excitation coil portion for generating a magnetic flux that passes through the fixed iron core and the movable iron core when energized, and a cylindrical shape of the fixed iron core. Around the root of the part, it is provided in a ring shape along the circumferential direction and fixed The electromagnetic actuator device having a ring-shaped non-magnetic portion which forms a magnetic path for sucking the movable iron core to the suction surface of the core, the axial length dimension of the non-magnetic portion 0.
The length is set within the range of 5 mm to 5.0 mm, and the axial length of the end of the straight outer wall of the movable iron core that is closer to the base side of the fixed iron core is set to 0 point. The area closer to the base side is defined as a negative (-) area, and the area farther from the base side of the fixed iron core than point 0 is defined as a positive (+) area. When the end closer to the base side is set as the start end, the position of the start end of the non-magnetic portion is -1.4 mm to +
It is characterized in that it is set within a range of 0.5 mm.

According to the electromagnetic actuator device of the present invention, the axial length of the non-magnetic portion is set in the range of 0.5 mm to 5.0 mm, and the starting position of the non-magnetic portion is set to-
Since it is set in the range of 1.4 mm to +0.5 mm, as shown in the graph of FIG. 4 obtained in the test example described later, the suction force is critical in the range of -1.4 mm to +0.5 mm. As a result, critical characteristics can be obtained, and a large suction force can be secured.

In the present invention, non-magnetic means a property that magnetic flux is less permeable than the material forming the fixed iron core. Therefore, the non-magnetic portion means a portion formed of a material through which magnetic flux is more difficult to transmit than the material forming the fixed iron core. Accordingly, the non-magnetic portion includes a portion formed of a paramagnetic material in addition to a portion formed of a non-magnetic material in a narrow sense.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (1) The non-magnetic portion may adopt a form made of a non-magnetic material formed by melting and solidifying a fixed iron core. The use of melt solidification enhances the integration between the fixed iron core and the non-magnetic portion.

(2) The non-magnetic portion is made of a material through which magnetic flux is less likely to pass than the material constituting the fixed iron core, and is made of a non-magnetic material. The non-magnetic material can be generally formed of a non-magnetic metal or a non-magnetic ceramic. As the non-magnetic metal, for example, an austenitic alloy, an aluminum alloy, or the like can be used. A typical austenitic alloy is austenitic stainless steel. Austenitic stainless steel is generally an Fe-Cr-Ni-based alloy.

(3) While irradiating the fixed iron core with a high-density energy beam, an additive material which is alloyed with a material constituting the fixed iron core is applied to the irradiated portion to partially melt the fixed iron core. By solidifying the molten portion, the fixed iron core is partially modified, and the reforming can form a non-magnetic portion having a property that magnetic flux is hardly transmitted. The high-density energy beam includes a laser beam and an electron beam. As a laser beam, for example, a YAG laser beam or a CO ₂ laser beam can be adopted in consideration of cost and output value.

(4) The position of the start end of the non-magnetic portion may be set in the negative (-) region.

(5) A mode in which the start position of the non-magnetic portion is set in the negative (-) region and the end position of the non-magnetic portion is set in the positive (+) region. can do.

(6) A form in which a magnetic shielding member (for example, a shim) formed of a non-magnetic material is coated on a side of the movable iron core facing the fixed iron core can be adopted. This can be expected to reduce the problems caused by the residual magnetism. As the nonmagnetic material, for example, an austenitic alloy, an aluminum alloy, or the like can be used.

(7) The axial length of the non-magnetic portion is 0.5-5.
It is set within the range of 0 mm. The nonmagnetic portion that suppresses the transmission of the magnetic flux is different in material from a fixed iron core formed of a material through which the magnetic flux easily passes, and thus tends to be expensive.
If the axial length of the non-magnetic portion is set in the above range, an increase in the area ratio and volume ratio occupied by the non-magnetic portion can be suppressed, and an increase in cost can be suppressed.

The axial length of the non-magnetic portion according to the present invention is 0.5 mm to 5.0 mm depending on the type of the electromagnetic actuator device.
It can be appropriately selected within a range of 0 mm. As the lower limit of the axial length of the non-magnetic portion, for example, 0.5 mm, 0.7 mm,
One of 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm and the like can be adopted. However, it is not limited to this.

The upper limit of the axial length of the nonmagnetic portion is, for example, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 m.
m, 3.0 mm, 3.4 mm, 3.6 mm, 3.8 mm
m, 4.0 mm, 4.2 mm, 4.4 mm, 4.6 m
m, 4.8 mm, etc. can be adopted. Therefore, the axial length of the above-described non-magnetic portion is in the range of 0.7 mm to 4.8 mm, depending on the type of the electromagnetic actuator device.
0.8 mm to 4.6 mm, 0.9 mm to 4.4
mm, within a range of 0.9 mm to 3.0 mm, or the like. However, it is not limited to this.

(8) The starting position of the non-magnetic portion is -1.4.
mm to +0.5 mm. Therefore, depending on the type of the electromagnetic actuator device, the position of the start end of the non-magnetic portion is within the range of -1.2 mm to +0.4 mm, within the range of -1.0 mm to +0.3 mm, and -0.8 m.
m to +0.25 mm, -0.7 mm to +0.1
It can be set appropriately within the range of mm. Therefore,
The position of the starting end of the nonmagnetic portion according to the present invention is -1.4.
mm, -1.3 mm, -1.2 mm, -1.1 mm,-
1.0mm, -0.9mm, -0.8mm, -0.7m
m, -0.6mm, -0.4mm, -0.2mm, 0m
m, +0.1 mm, +0.2 mm, +0.3 mm, or the like.

In the present invention, since the axial length of the non-magnetic portion is defined, if the start position of the non-magnetic portion is set, the end position of the non-magnetic portion in the axial direction is naturally defined. Will be done. The positions of the ends of the non-magnetic portion are +0.4 mm, +0.3 mm, +0.2 mm, +
0.1 mm, 0 mm, -0.2 mm and the like can be adopted. However, it is not limited to this.

(9) The axial length of the non-magnetic portion can be measured more easily on the outer surface of the cylindrical portion of the fixed iron core than on the inner surface of the cylindrical portion. For this reason, it is preferable to adopt the dimension on the outer surface side of the cylindrical portion of the fixed iron core as the axial length of the non-magnetic portion.

(10) The electromagnetic actuator device may be any device as long as the actuator section operates by suction of the movable iron core. A typical electromagnetic actuator device is an electromagnetic valve.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. This embodiment is an example applied to a solenoid valve which is a typical electromagnetic actuator device.

FIG. 1 shows a cross section of the fixed iron core 3 of the solenoid valve along the axial direction. This solenoid valve is attached to a device 1 for supplying or stopping the supply of the working medium. The device 1 includes, for example, an in-vehicle device and an industrial device. An example of the vehicle-mounted device is a brake device. The working medium includes working oil and working gas.

The device 1 includes a mounting hole 10 having a recess 10 a for seating, a first flow path 11 formed inside the device 1 and functioning as an out port, and a first flow path 1 inside the device 1.
The second flow path 12 which functions as an import and is provided so as to intersect with the first flow path 1 and communicates with the first flow path 11.
And The working medium is set to flow from the second flow path 12 to the first flow path 11.

The solenoid valve according to this embodiment has a casing 2
, Fixed iron core 3, movable iron core 4, actuator part 5
And an exciting coil section 6. The casing 2 has a cylindrical shape (material:
(Galvanized steel sheet), and is fixed to the seating recess 10 a of the mounting hole 10 of the device 1 via a ring-shaped seal member 13. The fixed iron core 3 is disposed in the casing 2 and is made of a steel material having high magnetic permeability. The fixed iron core 3 includes a columnar base 31 and a cylindrical section 33 provided coaxially and integrally with the base 31. The base 31 of the fixed iron core 3 has a flat suction surface 34 having a circular shape along the direction perpendicular to the axis, and a spring insertion hole 35 opened in a central region of the suction surface 34. Spring insertion hole 35
Is mounted with a return spring 36 formed of a coil spring. The return spring 36 is not limited to a coil spring,
Known springs such as a leaf spring and a disc spring can be employed. The return spring 36 has a biasing force in the direction of the arrow Y <b> 1, and constantly biases the movable iron core 4 in a direction in which the movable iron core 4 is separated from the fixed iron core 3.

As shown in FIG. 1, the cylindrical portion 3 of the fixed iron core 3
Reference numeral 3 denotes a thin cylindrical first cylindrical portion 37 extending coaxially from the base portion 31 and a thickness extending coaxially from the first cylindrical portion 37 and bulging radially outward. And a second cylindrical portion 38 having a meat cylindrical shape. The concave locking portion 39 formed on the outer peripheral surface of the second cylindrical portion 38 is locked by a convex locked portion 10 c formed on the inner peripheral surface of the mounting hole 10 of the device 1. Thus, the fixed iron core 3 is fixed in a state of being fitted into the mounting hole 10 of the device 1. The second cylindrical portion 38 of the fixed iron core 3 has a passage 38x formed in the radial direction so as to communicate with the first flow passage 11.

As shown in FIG. 3, the cylindrical portion 33 of the fixed iron core 3 has a ring-shaped straight inner wall surface 70 and a storage chamber having a circular cross section defined by the straight inner wall surface 70. 74. The straight inner wall surface 70 of the fixed iron core 3 extends coaxially with the central axis P of the fixed iron core 3 so as to surround the suction surface 34 of the fixed iron core 3 along the axial direction. Have been. That is, the straight inner wall surface 70 of the fixed iron core 3 is substantially parallel to the central axis P of the fixed iron core 3. As shown in FIG. 1, a plug member 76 is fitted to the distal end opening 74 k side of the storage chamber 74 of the fixed iron core 3, and the distal end opening 74 k of the storage chamber 74 of the second cylindrical portion 38 is fitted by the plug member 76. It is closed. The plug member 76 has a large diameter main hole 76m and a small diameter valve hole 7.
6n are formed in series. Main hole 76m and valve hole 76
n communicates with the first channel 11, the channel 38x, and the second channel 12.

As shown in FIG. 3, a first inclined surface 77 is formed between the straight inner wall surface 70 of the fixed iron core 3 and the periphery of the suction surface 34. The first inclined surface 77 is provided mainly due to the restriction on the processing of the fixed iron core 3, and is inclined such that the inner diameter becomes smaller as approaching the suction surface 34 of the fixed iron core 3. The first inclined surface 77 has a ring shape so as to make one round around the suction surface 34 of the fixed iron core 3.

As shown in FIG. 1, the movable iron core 4 is accommodated in an accommodation chamber 74 of the fixed iron core 3, and is arranged so as to be movable along the axial direction, that is, along the directions of arrows Y1 and Y2. ing. The movable iron core 4 includes a straight outer wall surface 42 extending along the straight inner wall surface 70 of the tubular portion 33 of the fixed iron core 3. A valve body 52 that can function as an actuator unit that performs a valve opening operation and a valve closing operation is provided at the distal end portion 4t of the movable iron core 4.
Are integrally held. The valve body 52 works with the movable iron core 4. Therefore, when the movable iron core 4 moves along the directions of the arrows Y1 and Y2, the valve body 52 moves in the same direction. Since the return spring 36 has an urging force for urging in the direction of the arrow Y1, the valve body 52 receiving this urging force closes the valve hole 76n.

As shown in FIG. 3, on the side of the movable iron core 4 facing the suction surface 34 of the fixed iron core 3, a shim 46 as a magnetic shielding member made of a non-magnetic material is held. ing. Although not shown, the movable iron core 4 has a recess along the axial length direction, and the shim 46 has legs, and the shim 46 is held by the movable iron core 4 in a state where the leg is mounted in the recess. Have been.

The shim 46 is formed of a nonmagnetic material (for example, a nonmagnetic alloy such as austenitic stainless steel). As shown in FIG. 3, the edge 4 w of the shaft end surface of the movable iron core 4 on the outer peripheral side of the shim 46 is exposed and faces the fixed iron core 3.

As shown in FIG. 3, the straight outer wall surface 42 of the movable iron core 4 is parallel to the central axis P of the fixed iron core 3, and is parallel to the central axis P of the fixed iron core 3. It makes one round. A second inclined surface 47 is formed at the distal end side of the straight outer wall surface 42 of the movable iron core 4. The second inclined surface 47 is provided mainly due to restrictions on processing of the movable iron core 4, and is inclined such that the outer diameter becomes smaller as approaching the suction surface 34 of the fixed iron core 3. This second inclined surface 47 is
It is formed in a ring shape so as to make one round around the suction surface 34 of the fixed iron core 3.

The clearance KA (see FIG. 3) between the shim 46 and the suction surface 34 of the base 31 of the fixed iron core 3 is set to 0.5 mm at the maximum. Therefore, the first inclined surface 77 and the second inclined surface 47 are minute.

As shown in FIG. 1, the exciting coil section 6 is disposed in the casing 2 and is wound around the central axis P of the fixed iron core 3 in a multiplexed manner and has a coil section 60 having a feed line 60h. And a ring-shaped coil holding portion 62 made of a material having a high magnetic permeability for holding the coil portion 60. As shown in FIG. 1, one end 60 k of the coil portion 60 in the axial direction is located on the base 31 side of the fixed iron core 3, and the other end 60 p of the coil portion 60 in the axial direction is fixed to the fixed iron core 3.
Is located on the side of the cylindrical portion 33. Therefore, the coil part 60
Is longer than the axis length of the nonmagnetic portion 8. When the excitation coil section 6 is energized, a magnetic flux that transmits through the fixed iron core 3 and the movable iron core 4 is generated.

In this embodiment, as shown in FIG.
A non-magnetic portion 8 is formed near the root of the cylindrical portion 33 of the fixed iron core 3. The non-magnetic portion 8 extends around the center axis P of the fixed iron core 3 so as to make one round.
3 is provided in a ring shape so as to be continuous along the circumferential direction. The non-magnetic portion 8 forms a magnetic path on the suction surface 34 of the fixed iron core 3 to attract the movable iron core 4.

The manufacture of the fixed iron core 3 and the non-magnetic portion 8 will be described. As shown in FIG. 2, first, a steel-based material 3A having a short-axis cylindrical shape is prepared. Then, the fixed iron core 3 including the base portion 31 and the cylindrical portion 33 is formed by forging. As forging, cold forging, warm forging, or hot forging may be used, but cold forging is preferable in consideration of higher dimensional accuracy. Next, the fixed iron core 3 is washed to remove the lubricating film coated on the fixed iron core 3. Next, a laser beam L (YAG laser beam), which is a representative high-density energy beam, is applied to the vicinity of the base of the cylindrical portion 33 of the fixed iron core 3 to melt it, and the modified alloy (Ni-Cr-based) The tip 80c of the wire-shaped additive material 80 formed by the above is applied to the irradiated portion. At this time, the fixed iron core 3 is rotated in the circumferential direction thereof. The fixed iron core 3 may be fixed, and the laser beam L may be rotated around the fixed iron core 3. By the operation described above, the components of the additive 80 are alloyed into the molten portion of the cylindrical portion 33. When the irradiation of the laser beam L is stopped, the molten portion that has been alloyed solidifies, so that a modified layer is formed. With the ring-shaped high-frequency induction coil facing the outer peripheral side of the modified layer, a high-frequency current is applied to the high-frequency induction coil to induction-heat the modified layer. Thereby, the modified layer is annealed. After that, finish cutting is performed on the modified layer. The modified layer thus formed is the non-magnetic portion 8. It should be noted that the material of the additive 80 is not limited to the above-described one, but may be any as long as it can form the nonmagnetic portion 8.

In this embodiment, as can be understood from FIG. 1, when the coil section 60 of the exciting coil section 6 is energized, a magnetic flux penetrating the fixed iron core 3 and the movable iron core 4 is generated, and The movable iron core 4 is sucked on the suction surface 34 of the core 3. As a result, the movable iron core 4 moves in the direction of the arrow Y2, and the valve body 52 linked to the movable iron core 4 opens. Here, since the pressure in the second flow path 12 is higher than the pressure in the first flow path 11, the working medium in the second flow path 12 passes through the through hole 38x, the valve hole 76n, and the main hole 76m, and flows along the arrow S1 direction. And flows into the first flow path 11.

When the coil section 60 of the exciting coil section 6 is turned off, the attraction force of the fixed iron core 3 to attract the movable iron core 4 is released. As a result, the movable iron core 4 moves in the direction of arrow Y1 due to the spring force of the return spring 36, and the valve element 52 held by the movable iron core 4 moves in the same direction. As a result, the valve element 52
Closes the valve hole 76n. Therefore, the working medium in the second flow path 12 is prevented from flowing into the first flow path 11. In this state, the solenoid valve is closed.

The reason why the shim 46 is non-magnetic is as follows. That is, when the excitation coil section 6 is turned off after being energized, the suction of the movable iron core 4 is released as described above, and the movable iron core 4 and the valve element 52 are moved in the direction of the arrow Y1 by the spring force of the return spring 36. And the valve hole 52n is closed by the valve body 52, and the solenoid valve is closed. In this case, if there is a large amount of residual magnetism in the movable iron core 4, there occurs a problem that the timing of the valve closing operation by the return spring 36 is likely to be delayed due to the effect of the attraction force due to the residual magnetism. In order to suppress this delay, it is conceivable to make the spring force of the return spring 36 excessive. However, when the spring force of the return spring 36 is excessive as described above, the exciting coil portion 6 is energized to attract the movable iron core 4 toward the fixed iron core 3 against the spring force of the return spring 36. When the valve element 52 is moved in the direction of the arrow Y2 to open the valve hole 76n, there occurs a problem that the timing of the valve opening operation is easily delayed. Suction force is return spring 36
This is because it is necessary to overcome the excessive spring force. Such a delay in the timing of the valve opening operation and the valve closing operation is not very desirable for the device 1 requiring a high-speed response. In particular, it is not preferable when the solenoid valve according to the present embodiment is incorporated in a vehicle-mounted brake system that requires a very high speed response. In this regard, in the present embodiment, a non-magnetic shim 46 facing the suction surface 34 of the fixed iron core 3 is held as a magnetic shielding member on the end surface side of the movable iron core 4, thereby suppressing the above-described problems. The high-speed response of the solenoid valve is improved.

In this embodiment, the axial length of the non-magnetic portion 8 formed on the fixed iron core 3 is 0.5 mm to
It is set within a range of 5.0 mm. This suppresses an increase in the area ratio and the volume ratio of the non-magnetic portion 8, which is a reformed portion formed of a reforming alloy that causes a high cost. As shown in FIG. 3, an end 42 r of the straight outer wall surface 42 formed on the movable iron core 4, which is closer to the base 31 side of the fixed iron core 3.
Is set to 0 point. An area closer to the base 31 side of the fixed iron core 3 than point 0 is defined as a negative (-) area. Positive (+) in the area farther from the base 31 side of the fixed iron core 3 than the zero point
Area. Base 31 of fixed iron core 3 in nonmagnetic portion 8
The side is the starting end 8s.

In this embodiment, as shown in FIG.
The position of the starting end 8s of the nonmagnetic portion 8 is set in a negative (-) region. In other words, the position of the starting end 8s of the nonmagnetic portion 8 is
It is set in the range of -0.1 mm to -0.6 mm. Further, as shown in FIG. 3, the position of the terminal end 8f of the nonmagnetic portion 8 is set in a positive (+) region. If the non-magnetic portion 8 is set in such a positional relationship, the suction force for sucking the movable iron core 4 can be increased as shown in a test example described later.

(Test Results) The inventor of the present invention has stated that, as a typical example of the axial length of the non-magnetic portion 8 formed on the fixed iron core 3 within the range of 0.5 mm to 5.0 mm described above, 1. 2 mm, 1.7 mm, and 2.2 mm, and the position of the starting end 8 s of the nonmagnetic portion 8 was set to −2 mm.
Test pieces with various changes within the range of ＋１1 mm were produced. With respect to these test pieces, the suction force for sucking the fixed iron core 3 was measured. In this test, the material of the fixed iron core 3 was chrome steel, and the material of the movable iron core 4 was carbon steel.

FIG. 4 shows the test results. In FIG. 4, the data marked with a triangle and the characteristic line W1 connected with the triangle show the test results when the axial length of the nonmagnetic portion 8 is 1.2 mm. The data indicated by the mark (■) and the characteristic line W2 connected with the mark (■) indicate the test results when the axial length of the non-magnetic portion 8 is 1.7 mm. The data marked with ▲ and the characteristic line W3 connected with ▲ indicate the test result when the axial length of the non-magnetic portion 8 is 2.2 mm. As shown by the characteristic lines W1, W2, and W3 in FIG. 4, the suction force was higher when the axial length of the nonmagnetic portion 8 was 1.7 mm than 1.2 mm. In addition, the suction force was higher at 2.2 mm than at 1.7 mm.

As shown in FIG. 4, in order to obtain a suction force exceeding 11 [N], according to this test, the starting end 8
It was found that the position of s should be set within the range of -1.4 mm to +0.5 mm. In other words, in order to obtain a large suction force, the position of the starting end 8s of the non-magnetic portion 8 must be -1.4 m.
It was found that the distance should be set in the range of m to +0.5 mm.

In order to obtain a larger suction force, as can be understood from FIG.
-1.2mm to + 0.4mm range, -1.0mm to +
It has been found that it is preferable to set the range to 0.3 mm, -0.8 mm to +0.2 mm, -0.7 mm to +0.15 mm, and the like.

Therefore, as described above, the preferred position of the starting end 8s of the non-magnetic portion 8 is -1.4 mm, -1.2 mm.
mm, -1.0 mm, -0.8 mm, -0.7 mm, and the like. Preferred positions of the end 8f of the non-magnetic portion 8 are +0.4 mm, +0.3 mm, +0.
2 mm, +0.1 mm, 0 mm, etc. can be adopted.

(Supplementary Note) The following technical idea can be understood from the present specification and the drawings. In each of the claims, a first inclined surface is formed at a tip of the straight outer wall surface of the fixed iron core on the suction surface side so that an inner diameter becomes smaller as approaching the suction surface of the fixed iron core. An electromagnetic actuator device characterized by the above-mentioned. -In each claim, a second inclined surface is formed on the tip end side of the straight outer wall surface of the movable iron core so that the outer diameter becomes smaller as approaching the suction surface of the fixed iron core. And an electromagnetic actuator device. An electromagnetic actuator device according to any of the preceding claims, wherein a magnetic shielding member for suppressing excessive residual magnetism is held in a central region of the movable iron core facing the fixed iron core.

[0049]

According to the electromagnetic actuator device of the present invention, the axial length of the non-magnetic portion is 0.5 mm to 5.0 mm.
And the position of the starting end of the non-magnetic part is-
Since it is set in the range of 1.4 mm to +0.5 mm, it is possible to contribute to further improvement of the suction force for sucking the movable iron core.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a state where a solenoid valve is attached to a device.

FIG. 2 is a perspective view illustrating a process of manufacturing a fixed iron core and a non-magnetic portion.

FIG. 3 is a graph showing test results.

FIG. 4 is a sectional view of a main part according to the related art.

FIG. 5 is a cross-sectional view of a main part of the related art.

[Explanation of symbols]

In the figure, 2 is a casing, 3 is a fixed iron core, 31 is a base, 3
Reference numeral 3 denotes a cylindrical portion, 34 denotes a suction surface, 4 denotes a movable iron core, 42 denotes a straight outer wall surface, 52 denotes a valve body (actuator portion), 6 denotes an exciting coil portion, 8 denotes a non-magnetic portion, 8s denotes a start end, and 8f. Indicates the end.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Ichiro Arita 2-1-1 Asahi-cho, Kariya-shi, Aichi Aisin Seiki Co., Ltd. (72) Inventor Naoki Kato 2-1-1 Asahi-cho, Kariya-shi, Aichi Aisin Seiki F term in reference (reference) 3H106 DA02 DA13 DA23 DB02 DB12 DB23 DB32 DC04 DC17 DD03 EE16 GA13

Claims (3)

[Claims] 1. A casing, comprising: a base disposed in the casing and having a suction surface extending in a direction perpendicular to an axis, and surrounding the suction surface along an axial length direction and with respect to a center axis. A fixed core provided with a cylindrical portion having a straight inner wall surface extending coaxially and a storage chamber partitioned by the straight inner wall surface; A movable outer surface that is movably arranged and has a straight outer wall surface extending along the straight inner wall surface of the tubular portion of the fixed iron core, and that is attracted to a suction surface side of a base of the fixed iron core; An iron core, an actuator portion connected to the movable iron core and connected to the movable iron core, an excitation coil portion that generates a magnetic flux that passes through the fixed iron core and the movable iron core when energized, the fixed iron core A ring is provided along the circumferential direction near the root of the cylindrical part of A ring-shaped non-magnetic portion that forms a magnetic path for attracting the movable iron core on the suction surface of the fixed iron core, wherein the non-magnetic portion has an axial length of 0.5 mm to 5 mm. .0 mm, and the axial length of the end of the straight outer wall of the movable iron core that is closer to the base side of the fixed iron core is set to 0 point, and the fixed iron core is set to be higher than the 0 point. A region closer to the base side of the fixed iron core is defined as a negative (-) region, and a region farther from the base side of the fixed iron core than the zero point is defined as a positive (+) region. When the end closer to the base side of the fixed iron core is set as the start end, the position of the start end of the non-magnetic portion is -1.4 mm to +0.5 mm.
An electromagnetic actuator device characterized by being set within the range of: 2. The electromagnetic actuator device according to claim 1, wherein the non-magnetic portion is made of a non-magnetic material integrally formed by melting and solidifying the fixed iron core. 3. The electromagnetic actuator device according to claim 1, wherein the end position of the non-magnetic portion is set in the positive (+) region.