JPH0314209B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnet for operating a solenoid valve or other machine, and more particularly to an electromagnet coil assembly used in the electromagnet and a method for manufacturing the same.

An object of the present invention is to provide a coil assembly with low eddy current loss.

Another object of the present invention is to
It is an object of the present invention to provide a method for manufacturing a coil assembly that allows easy manufacturing work.

The drawings showing the embodiments of the present application will be described below. 1 to 12, the electromagnetic valve device includes a valve device 1, an electromagnet 2 for operating the valve device, and a terminal box 3 for connecting an electric wire for power supply to the electromagnet 2. . First, valve device 1
I will explain about it. Inside the main body 4, a space 5 for advancing and retreating the spool and an oil passage 6 are formed. The main body 4 is also provided with a port 7 for connecting a hydraulic source (for example, a pump), a port 8 for connecting to an oil tank, and ports 9 and 10 for connecting to a driven device such as a hydraulic cylinder. , these ports communicate with the space 5 or the oil passage 6 for advancing and retreating the spool. A well-known spool 11 is provided in the space 5 for advancing and retracting the spool and is movable in the left and right directions in FIG. Spool 11
Spring seats 12 are installed at both left and right ends of the
Spool return springs 13 are interposed between these spring seats 12 and fixed iron cores of each electromagnet, which will be described later. These spool return springs 13 are for positioning the spool 11 in a neutral position as shown in FIG. 1, and each uses a compression spring.

Next, the electromagnet 2 will be explained. This electromagnet consists of a driving body 16 for mechanically operating the valve device 1, and an excitation body 17 for exerting a magnetic force on the driving body 16. First, the driving body 16 has a fixed iron core 20 and a connecting portion 21 provided in a part thereof.
is screwed onto the main body 4 of the valve device 1. Further, the fixed core 20 has a flange portion 22, and the O-ring 23 for sealing is pressed down by the flange portion 22. Furthermore, a through hole 24 is bored in the fixed core 20, into which a push rod 25 is inserted so as to be freely movable in the left and right direction in FIG. One end of a cylindrical body 26 is placed over the other end of the fixed iron core 20, and both are fixed to each other by welding means so that the space inside the cylindrical body is sealed. The cylindrical body 26 is made of a non-magnetic material, and has a space formed therein for moving the movable core forward and backward. A closure body 27 is provided at the other end of the cylindrical body 26.
is fixed by welding means so that the inside is sealed. A through hole 28 is provided in a part of the closure body 27, and a push pin 29 for manual operation is provided therein so that it can be freely moved to the left in FIG. 1 and returned to the state shown in the figure. . Through hole 2
The seal between 8 and push pin 29 is provided by an O-ring 30. A movable iron core 31 is provided in a space formed inside the cylindrical body 26 so as to be movable in the left and right directions in FIG. A groove 32 for oil circulation is formed in a part of the circumferential surface of the movable core 31 over its entire length in the longitudinal direction, so that oil flows between the left and right sides of the movable core 31 in FIG. It is adapted to be able to move through the groove 32. The drive body 16 is also called a tube assembly. Next, the excitation body 17 will be explained. This excitation body 17 is located on the outer peripheral side of the drive body 16 and is prevented from moving away from the valve device 1 by a stopper 18 . The excitation body 17 first has a housing 35 . This housing 35 may be formed of a resin material or as a metal die-gas molded product.
A coil assembly 36 is housed inside the housing 35, and the coil assembly 36 is housed inside the housing 35.
6 and the inner surface of the housing 35 is filled with a filler material 37. As the filler 37, a synthetic resin material with high electrical insulation and good heat conduction is used. Next, the coil assembly 36 will be described. The coil assembly 36 includes a cylindrical coil body and a yoke 44 covering the outside of the cylindrical coil body. First, the coil body 38 is cylindrical and has flanges at both ends of the bobbin 39.
It is constructed by winding the . A tongue piece 41 is made to protrude from one collar of the bobbin 39,
A plug holder 42 is formed at the tip of the tongue piece 41. The coil winding 40
A lead wire 40a is connected thereto. The coil bobbin 39 is naturally made of a material with good electrical insulation, and the coil winding is made of a material with low electrical resistance, such as copper wire. Next, yoke 4
4 is a plurality of (two in this example) yoke elements 4;
Consists of 5.45. Each yoke element 45 is constructed by arranging a plurality of yoke elements 47 of the same shape radially with respect to the axis of the coil body 38 inside an outer frame 46 used as an auxiliary member. It is preferable that the outer frame 46 be made of a magnetic material in order to use it as a magnetic circuit, but this is not necessarily the case. Furthermore, the yoke piece 47 is naturally made of a magnetic material. As shown in FIG. 6, each yoke piece 47 is composed of an intermediate member 48 located on the outer peripheral side of the coil body 38 and end members 49, 49 integrally connected to both ends of the intermediate member 48. The intermediate member 48 is formed to be substantially the same length as the coil body 38 (slightly larger to provide clearance for assembly as described later). Also, the width is the same as the intermediate member 48 of many other yoke pieces.
The width is formed to allow sufficient passage of the magnetic flux generated by the coil body 38. The end member 49 is formed to have a length that is the sum of the thickness of the coil body 38 and the width of the intermediate member 48 (the length of the coil body 38 in the radial direction). Further, its width (length in the axial direction of the coil body 38) is set to a width that allows the magnetic flux of the coil body 38 to pass through sufficiently, similarly to the intermediate member 48. Each intermediate member 48 of the plurality of yoke pieces 47 is a cylindrical yoke portion (actually, it is cylindrical with a part of the side surface open, but it has a magnetic function) that surrounds the coil body 38. That is, an opening as large as that of this embodiment has no problem with the function of passing the magnetic flux generated in the coil body 38. In addition, each end member 49 of the plurality of yoke pieces 47 as a whole covers the circumferential surface of the space in which the movable core 31 advances and retreats, one end of the cylindrical yoke portion, and the circumferential surface of the fixed core and the cylindrical yoke portion. This constitutes a flange-like yoke portion that connects the other end of the yoke to the other end of the yoke.

Next, the terminal box 3 will be explained. This terminal box 3
The box body 52 has a box body 52 and a lid body 53 placed over the box body 52, both of which are made of an insulating material such as synthetic resin. The box body 52 includes a base body 54 and a partition wall body 5.
5 and 56, the base body 54 and the partition body 5
5 is fixed to the main body 4 of the valve device 1 by a fixing screw 57. A control circuit storage space 58 is formed between the base body 54 and the partition wall body 55, and a control circuit 59 is housed therein. This circuit 59
A plurality of elements 61 and a socket 6 are mounted on a circuit board 60.
2. It is constructed by attaching a pilot lamp 63, etc. The plug 43 is removably connected to the socket 62, as clearly shown in FIG. The partition wall body 56 is provided with a connection terminal 64.
Further, a wire lead-in port 65 is integrally formed in the partition wall 56, and a power supply wire drawn through the lead-in port 65 is connected to the connection terminal 64. The lid 53 is attached to the box body 52 with attachment screws 66.

Although not shown in FIG. 1, an electromagnet similar to the electromagnet 2 is installed on the left side of the valve device 1 (only a part of the fixed core is shown), and a plug provided for the electromagnet is connected to the control circuit. It is connected to a socket 62 provided on the left side of 59.

In the case of the above configuration, when power is supplied to the connection terminal 64 via the electric wire drawn in from the outside, the power is passed through the control circuit 59 and further into the plug 4.
3 to the coil winding 40. Also, in this case, the pilot lamp 63 lights up as is well known.
When power is supplied and current flows through the coil winding 40 as described above, the cylindrical yoke portion of the yoke 44, one of the flanged yoke portions, the movable core 31, the fixed core 20, and the other flanged portion of the yoke 44 Magnetic flux passes through the magnetic circuit made up of the yoke part. the result,
The movable core 31 is attracted toward the fixed core 20 and moves in that direction. This movement of the movable iron core 31 is transmitted to the spool 11 via the push rod 25, and the spool 11 moves to the left in FIG. As a result, port 7 and port 9 communicate with each other, and port 10 and port 8 communicate with each other.

Next, when the electricity is turned off as described above, the coil 38 no longer generates magnetic flux. Therefore, the movable iron core 31
is no longer attracted to the fixed iron core 20. Then the first
The spool 11 is returned to the neutral position as shown in FIG. 1 by the biasing force of a spool return spring 13 provided on the left side of the spool 11 in the figure. Further, the movement of the spool 11 causes the movable core 31 to be returned to the position shown in FIG. 1 via the push rod 25.

When the coil winding 40 is energized to operate the movable iron core 31 as described above, even if the current flowing through the coil winding 40 is alternating current, the eddy current loss in the yoke 44 can be reduced, and the eddy current loss of the above current can be reduced. Energy can be used efficiently for operating the movable iron core 31. That is, when the magnetic flux passes through the yoke 44 by energizing the coil winding 40 as described above, since the yoke 44 is composed of a large number of pieces 47 arranged in a radial manner, it is difficult for eddy current to flow there. Eddy current loss there is small. Therefore, as described above, the energy of the current can be used efficiently.

Further, when the electromagnet is operated by energizing the coil winding 40 as described above, the coil winding 40
Even if 0 generates heat, the heat can be efficiently dissipated to the outside. That is, in the yoke 44 surrounding the coil body 38, a large number of yoke pieces 47 are arranged radially. Therefore, when the heat generated by the coil winding 40 is transmitted from the outer circumferential surface of the coil winding 40 to the inner circumferential end of the yoke element piece 47, the heat is directly transmitted outward through each yoke element piece 47 in the radial direction. It is then carried to the outer peripheral end of each yoke piece 47. Therefore, the heat generated by the coil winding 40 can be radiated from a wide portion of the entire outer peripheral surface of the yoke 44. Thereby, the heat of the coil body 38 can be efficiently released. Furthermore, each yoke element piece 4
The heat reaching the outer peripheral edge of the outer frame 46 and the filler 3
7. Through direct heat conduction through the housing 35 etc., it can reach the outer peripheral surface of the housing 35 and be radiated from there, so that the heat generated by the coil winding 40 can finally be transferred to the outer peripheral surface of the housing 35. It can be efficiently dissipated from the surface.

Next, the manufacturing procedure of the above excitation body 17 will be explained. First, the housing 35 is manufactured, and then the coil assembly 36 is manufactured. This coil assembly 36 is manufactured as follows. That is, first, a coil winding 40 is wound around the coil bobbin 39, and its lead wire 40a is connected to a plug 43 to form a coil body 38 as shown in FIG. On the other hand, a plurality of yoke elements 45 are formed in a separate process. For its manufacture, a required number of outer frames 46 as shown in FIG. 5 are prepared, and a large number of yoke pieces 47 as shown in FIG. 6 are prepared. Further, as shown in FIGS. 8 and 9, an assembly jig consisting of an outer envelope 71 and a center rod 72 removably fitted into the outer envelope 71 is prepared.
The thickness of the center rod 72 is made the same as the thickness of the drive body 16. Once such a jig is prepared, the outer frame 46 is first fitted between the outer enclosure 71 and the center rod 72 of the jig. Thereafter, a number of yoke pieces 47 are inserted between the outer frame 46 and the center rod 72 from above to below in FIG. Once a predetermined number of yoke elements 47 have been inserted, the outer enclosure 71 is divided into two parts at the dividing line 73 in FIG. Take out the pieces 47 so that they do not come apart. Next, the removed yoke element 45
is placed on the outside of the coil 38 previously formed as shown in FIG.
Make the state as shown in the figure. This completes the assembly of the coil assembly 36. Then the 10th
The coil assembly 36 is inserted into the housing 35 as shown in the figure. Next, as shown in FIG. 11, a positioning jig 74 is assembled.
This positioning jig 74 has a fitting part 75 that fits on the outside of the opening of the housing 35 and a rod-shaped body 76 that is inserted into the inside of the coil assembly 36. The coil assembly 36 is positioned relative to the housing 35.
Note that the rod-shaped body 76 is formed to have the same size as the thickness of the drive body 16. Next, a liquid filler is injected into the housing 35 through the injection hole 77 provided in the jig 74 . This filler is made to flow not only between the housing 35 and the coil assembly 36, but also between the coil body 38, the yoke piece 47, and the outer frame 46 in the coil assembly 36. And after injection, let it solidify. In this case, the housing 35 is provided with a bottom plate 35a in advance, as shown in FIG. 11, to prevent the liquid filler from flowing out. Once the filling material has solidified, the jig 74 is removed and the bottom plate 35a is removed. As a result, the exciter 1
7 is completed.

In the case of injection of the above-mentioned filler, the positioning jig 74
If the rod-shaped body 76 is made of a magnetic material and a current is passed through the coil body 38 of the coil assembly 36 via the plug 43, the following effects can be obtained. That is, when the coil body 38 is energized, the rod-shaped body 76 is magnetized and becomes a magnet. As a result, as shown in FIG.
a is attracted to the rod-shaped body 76. Therefore, the inner circumferential ends 49a of the end members 49 in the large number of yoke pieces 47 are arranged neatly along the outer circumferential surface of the rod-shaped body 76. Further, the outer peripheral end 49b of the end member 49 has the same polarity (for example, N
As shown in FIG. 12, the outer peripheral ends 49b of the end members 49 of the large number of yoke pieces 47 are arranged at equal intervals. Therefore, if the filler is injected and solidified in this state, a large number of yoke pieces 47 can be fixed in a state in which they are arranged in an orderly manner at approximately equal intervals. Furthermore, in the case of the one formed as described above, the inner peripheral end 4
Since the positions of the 9a are neatly aligned as described above, when the electromagnet 2 is assembled, the inner peripheral end 49a of the electromagnet 2 is aligned with the fixed core 20 or the movable core 31 of the driving body 16.
located extremely close to. As a result, the magnetic resistance in the magnetic circuit as described above can be further reduced, and a large operating force can be generated in the movable core 31. Furthermore, as mentioned above, the coil body 3
By supplying electricity to 8, it generates heat, and the heat can be used to promote solidification of the filler.

On the other hand, in addition to manufacturing the excitation body 17, the drive body 16
Manufacture. That is, the cylindrical body 26 is placed over the fixed core 20 and fixed by welding, and the movable core 31 is inserted into the cylindrical body 26. Furthermore, while inserting the push pin 29 into the through hole 28 of the closure body 27,
The closing body 27 and the cylindrical body 26 are fixed by welding. As a result, the driving body 16 is completed. Next, the assembly procedure of the solenoid valve device will be explained. First, the connecting portion 21 of the driving body 16
The drive body 16 is coupled to the valve device 1 by screwing into the screw hole of the valve body 4. Next, the exciter 17
is placed on the outer peripheral side of the driving body 16. Next, the stopper 18, for example, a C ring, is fitted into the groove 27a provided in the closure body 17 in a direction perpendicular to the plane of the paper in FIG. As a result, the excitation body 17 is also fixed to the valve device 1, and the electromagnetic valve device is completed.

Next, FIGS. 13 and 14 show different examples of the assembly jig for the yoke element 46 (different examples from those shown in FIGS. 8 and 9). The assembly jig shown in these figures includes the outer enclosure 71e
and the center rod 72e are integrally formed.

It should be noted that the same reference numerals as those in the previous figure are appended with an alphanumeric letter "e" for parts that are functionally the same or equivalent to those in the previous figure, and redundant explanations are omitted.
(Furthermore, in the following figures, the same concept is applied sequentially, and the alpha alphabets f, g, etc. are attached in order, and redundant explanations are omitted.) Next, Fig. 15 shows an example of a different method of injecting the filler. It is something. In the figure, the mold is composed of two elements 78 and 79, and a rod-shaped body 76f is attached to element 79. In the case of such a configuration, the coil assembly 36f is assembled in the housing 35f, and the element 79 and the element 7
Insert between 8. Next, a filler is poured between the housing 35f and the coil assembly 36f through the injection hole 77f. The filling material is then solidified. In this case, as in the previous case, the plug 43f
It is preferable to energize the coil body 38f via the coil body 38f. Once the filler has solidified, the elements 78, 79 are separated from each other. With this, the excitation body 17f is completed. In the case of the example shown in FIG. 15, it is not necessary to provide the housing 35f with a bottom plate as described above.

Next, FIG. 16 shows a further different example of the method of forming the excitation body 17g. In FIG. 16, molding is carried out using a mold similar to that shown in FIG. 15. Also, in this example, molding is performed without using the housing. That is, as shown in the figure, the coil body 38g and the yoke 44g are positioned around the center rod 76g of the element 79g, and the elements 78g and 79g are assembled in this state. Then, the filler is injected through the injection hole 77g and solidified. According to such a method, when the injected filler solidifies, the solidified filler comes to function as a housing. In the case of this example as well, it is preferable to energize the coil body 38g via the plug 43g as in the case described above.

Next, FIGS. 17 and 18 show the yoke element 45h.
This figure shows different examples of jigs used for assembly. This jig consists of an outer frame 81, an inner frame 82 that can be divided into two, and a core 83. The yoke element 45h is assembled using such a jig as follows. That is, first, a large number of yoke pieces 47h are arranged around the core 83 as shown in FIG.
h into the inner frame 82 that has been assembled into the outer frame 81. Then, from the injection port 84 formed between the inner frame 82 and the core 83, the yoke element piece 47h
A bonding material such as liquid resin or adhesive is poured in to bond the parts. Once the binding material has solidified, first the outer frame 81 is removed, then the inner frame 82 is disassembled into two, and the completed yoke element 45h is removed from the core 83. The yoke element 45h formed in this way has a large number of yoke pieces 47h.
Since they are all integrated, the next operation, that is, fitting the coil body and inserting it into the housing, can be easily carried out. In this example, if the core 83 is constructed using a permanent magnet, it is easy to fit a large number of yoke pieces 47h to the core 83 and insert them into the inner frame 82. Can be done. That is, the magnetic force of the core 83 allows the plurality of yoke pieces 47h to be connected (retained) around the core 83, thereby preventing the large number of yoke pieces 47h from coming apart. In addition, in this case, a large number of yoke pieces 47h can be arranged in an orderly manner as in the case described based on FIG. 12.

Next, FIG. 19 shows a still different example of the assembly jig. This example is an example in which the division positions of the inner frame 82i are different from those shown in FIGS. 17 and 18.

Next, FIG. 20 shows a further different embodiment of the present application. In the example shown in FIG. 20,
The yoke 44j is composed of four yoke elements 45j. Note that the number of yoke elements is not limited to two as in the previous embodiment or four as in this embodiment, but may be any number of three or more.

Next, FIGS. 21 and 22 show examples of different shapes of yoke pieces. The yoke element piece 47k shown in these figures is formed so that the thickness is thinner toward the inner circumferential side and thicker toward the outer circumferential side. When such a yoke element piece 47k is formed into a yoke 44k as shown in FIG. 23, a large number of yoke element pieces are arranged closely together without any gaps. Therefore, a magnetic path with a large cross-sectional area can be formed, and the magnetic resistance therein can be reduced. In other words, the radial dimension can be reduced in order to obtain the required cross-sectional area, thereby making it possible to downsize the electromagnet. In the case of this example, it is preferable to use a silicon steel plate as the yoke piece 47k, or, in the case of a normal magnetic steel plate, to perform appropriate surface treatment to make it difficult for eddy currents to flow therethrough.

Next, FIGS. 24 and 25 show examples of further different shapes of the yoke pieces. In these figures, the yoke piece 47l has a convex portion 86 for maintaining the distance.
have. When forming the yoke element piece 47l by punching out a metal plate material (magnetic metal plate material), this convex portion can be formed to protrude at the same time as the punching. By using the yoke element pieces 47l having such convex portions 86, the yoke elements can be arranged in an orderly manner at equal intervals as shown in FIG.

Next, FIGS. 27 and 28 show further different examples of the yoke element, in which a convex portion 86m for maintaining the distance is shown.
An example is shown in which an engaging protrusion 87 is further provided at the tip, and an engaging recess 88 is formed inside the spacing maintaining convex portion 86m. Yoke piece 4 like this
7m, when forming the yoke element 46m, by arranging each yoke element 47m so that the engagement protrusion 87 of each yoke element 47m engages with the engagement recess 88 of the other yoke element 47m. , the plurality of yoke pieces 47m can be integrated by their engagement. Therefore, as shown in FIG. 29, the yoke element 46m can be formed without using the aforementioned outer frame.

Next, FIG. 30 shows an example of a drive body having a different structure, in which a drive body 90 has a hollow container 92. This container 92 has a connecting body 93 for connecting to the main body of the valve device, and a housing body 94 for housing a movable iron core, which will be described later. The connecting body 93 is generally made of a magnetic material such as iron, but may also be made of a non-magnetic metal. Next, the storage body 94 has a cylindrical member 97 that guides the movement of the movable iron core and an end member 98 that is formed integrally with the cylindrical member 97. These cylinder members 9
7. The end member 98 is made of a magnetic material,
It may also be made of non-magnetic material. One end of an intermediate cylinder 99 is fixed to one end of the cylindrical member 97 by welding means over its entire circumference. This intermediate cylinder 99 is located inside the coil and outside the space in which the movable core advances and retreats. Therefore, the magnetic flux that should pass through the movable core and the fixed core flows through this intermediate tube 99.
It is made of non-magnetic material to prevent it from passing through. Intermediate cylinder 9
The other end of the connector 9 is welded to the tip of the cylindrical portion 96 of the connecting body 93 over the entire circumference. As a result, the inside of the hollow container 92 is sealed. Inside the hollow container 92, a fixed iron core 101 is fixedly provided at a position close to the connecting body 93, and a movable iron core 102 is provided to freely move forward and backward in the left and right directions in the figure.

Next, the fixed iron core 101 will be explained in detail with reference to FIGS. 31 to 38. This fixed core 101 consists of a central bundle 103 and a core main body 104 disposed around it. Binding body 10
3 is constructed by combining two elements 105 and 106. In addition, the above-mentioned bundle 103 is S10C or
For example, it is formed using a high strength material such as S45C. Each of the elements 105 and 106 has a joint 107 around it. These joint portions 107 have a dovetail-shaped cross section. The element 105 also has a through hole 108 in its center, through which the push rod is inserted. Next, the core main body part 104 is the 37th
Iron core piece 10 as shown in Fig. 38 and Fig. 38, respectively.
It is constructed using a plurality of materials 9 and 110.
The core pieces 109 and 110 are arranged alternately as shown in FIG. 32, and each is arranged radially around the bundle 103. The core piece 109 is made of, for example, a silicon steel plate, and the iron core piece 110 is made of a magnetic steel plate so that eddy currents are hardly generated in the main body portion 104. The core piece 110 is thicker toward the outer circumferential side and thinner toward the inner circumferential side. As a result, by sequentially overlapping each of the pieces 109 and 110, they are arranged in a ring shape around the bundle 103 as a whole.
Incidentally, both of the pieces 109 and 110 may be formed of silicon steel plates. Further, both may be formed of magnetic steel plates, but in that case, it is preferable to use an arbitrary surface treatment to increase the electrical resistance of the surface. When making pieces from one type of material in this way, there is no need to make pieces with different shapes as shown in Figures 37 and 38, and when multiple pieces are closely arranged, It is sufficient to use a single type of elemental piece with a thickness such that it can be radial. On the inner peripheral side of each of the core pieces 109 and 110,
A connecting portion 111 having a corresponding shape to be connected to the connecting portion 107 of the bundle 103 is provided. Furthermore, fixing recesses 112 are formed in the outer peripheral portions of each of the core pieces 109 and 110, respectively. Each recess 112 of each of these core pieces 109, 110
The grooves 113 are continuous with each other and form grooves 113 as shown in FIG. The above fragments 109, 110
Also, there is a recess 11 for retaining the Kumatori coil.
It is equipped with 4. These recesses 114 are also the 32nd
A groove 115 is formed as shown in the figure. A Kumatori coil 116 is embedded in the groove 115 as clearly shown in FIG. The bear coil 116 is made of a material with good conductivity, such as copper. Any means such as cutting or press punching may be used as the forming means.

Next, regarding the movable iron core 102, FIGS.
This will be explained with reference to FIG. This movable iron core 102 and the fixed iron core 101 are configured equally. That is, the bundle 117 consists of two elements 118 and 119, and these elements have a connecting part 120. On the other hand, the core main body 121 around the bundle 117
A plurality of core pieces 122 each made of a silicon steel plate and a plurality of iron core pieces 123 each made of a magnetic steel plate are arranged radially around the axis of the bundle 117. It is formed by overlapping the . Furthermore, each core piece 122, 123 is connected to the joint part 12.
4, and this connecting portion 124 is connected to the connecting portion 120 of the binding body 117. next,
The main body portion 121 of the movable core 102 has an oil flow groove 125 on its circumferential surface. This groove 125 is formed to be long in the longitudinal direction of the movable iron core, that is, in the advancing and retreating direction. Its formation consists of a piece 12 with a small radial dimension.
2', 123'. In the main body part 121, the fixed iron core 10
An oil circulation groove 126 is formed on the surface opposite to 1. This groove 126 is formed by reducing the longitudinal dimension of some of the pieces 122', that is, the axial dimension of the movable core 102, as shown clearly in FIG. Furthermore, the movable iron core 102
In the element 118 of the bundle 117, the groove 1 is
An oil flow groove 127 connected to 26 is formed.
Incidentally, the dimension L between the grooves 127, 127 located at mutually opposing positions is formed to be smaller than the diameter of the push rod. Therefore, the movable iron core 102
Even in the state in which the groove 127 is adsorbed to the fixed iron core 101, a portion of the groove 127 is connected to the through hole 108, and oil can flow therethrough.

In the case of the above configuration, when the movable core 102 is operated by energizing the coil as described above, even if the current flowing through the coil is alternating current, the fixed core 102
1 and the movable core 102 can be reduced, and the energy of the current can be transferred to the movable core 1.
It can be used efficiently for the operation of 02.
That is, when magnetic flux passes through the fixed iron core 101 and the movable iron core 102 by energizing the coil as described above,
Since the yoke is provided on the outer periphery of the fixed iron core 101 and the movable iron core 102, the magnetic flux passing through the fixed iron core 101 and the movable iron core 102 mainly flows through the outer periphery of the core 101 and the movable iron core 102, not the center thereof. Pass through 104 and 121. However, the main body portions 104, 121 are constructed by arranging a large number of core pieces in a radial manner, and have a structure in which eddy currents do not easily flow therein. Therefore, when the movable core 102 is operated by energizing the coils as described above, the eddy current loss in the cores 101 and 102 is reduced.

In addition, in the case of the above operation, when the load bearing surface of the movable core 102, that is, the surface that contacts the push rod, collides with the rod, the reaction force of the impact is applied from the rod to the bundle 117 in the axial direction (horizontal direction in FIG. 30). join. This reaction force is applied to all the pieces 122 and 123 in the same way via the joint 120 and the joint 124 connected thereto. Therefore, even if the above-mentioned collisions are repeated, it is extremely rare for a large number of elemental pieces to become misaligned with each other.

Next, the manufacturing procedure of the driving body 90 will be explained. First, the fixed core 101 in the drive body 90 is manufactured as follows. That is, first, one bundle element 105 as shown in FIG. 35, one bundle element 106 as shown in FIG. 36, one element piece 109 in FIG. 37, and one element piece 110 in FIG. Prepare many sheets. Next, as shown in FIG. 39A, the element 105 is fixed to a jig 128 prepared in advance by any means. For example, the positioning rod 129 of the jig 128 is inserted into the through hole 108. After that, a large number of elementary pieces 109 and 110 are transferred to the third
One or several sheets are arranged radially around the element 105 in the arrangement order shown in FIG. 2. In this case, the connecting portion 111 of each elemental piece is connected to the connecting portion 107 of the element 105. Next, after arranging the predetermined number of elementary pieces,
The element 106 is fitted onto the element 105 by press-fitting means such that the coupling part 107 is coupled to the coupling part 111. After the above operations are completed, each elemental piece is prevented from separating from the bundle 103 because the connecting portion 111 of each elemental piece is connected to the connecting portion 107 of the bundle 103. Next, swage the part indicated by numeral 130 to convert element 106 to element 105.
The elements 105, 106 and the pieces 109, 110 are securely fixed together by welding the parts indicated by reference numeral 131.
Thereafter, the outer circumferential surface of the main body portion 104 is polished (for example, centerless polishing) to have a diameter that fits snugly inside the cylindrical portion 96 and the intermediate tube 99 of the hollow container 92. Also fixed core 101
Both end surfaces (left and right end surfaces in Fig. 33)
Cut each to make a flat surface. Incidentally, after or before the polishing process and the cutting process described above, the Kumatori coil 116 is assembled into the groove 115. This operation involves fitting the coil 116 into the groove 115, deforming the portion indicated by reference numeral 132 in FIG. 32 as shown in FIG.
6 comes into contact with the side wall of the groove 115 and is fixed there. This completes the fixed core 101.

Next, the movable core 102 is assembled in the same manner as the fixed core 101. That is, after assembling the main body 121 to the bundle 117, the reference numeral 133
The elements 118, 119 are fixed to each other by caulking the parts indicated by , and then welding the parts 134 and 135, respectively, to form the elements 118, 119 and the pieces 122, 123, 122'. ,1
23' are surely integrated and fixed. However, the rear main body part 1
The outer peripheral surface of 21 is polished. As a result, the movable iron core 102 is completed.

On the other hand, apart from the above-mentioned work, the connecting body 93 and storage body 94 in the hollow container 92 are formed. Storage body 9
4, the cylindrical member 97 and the intermediate cylinder 99 are welded in advance, and the inner circumferential surface thereof is polished so as not to interfere with the forward and backward movement of the movable core 102.

Next, the fixed core 101, the movable core 102, push pins, etc. are assembled inside the hollow container 92 to complete the driving body 90. In this operation, the fixed core 101 is first fitted into the cylindrical portion 96 of the connecting body 93. On the other hand, a push pin is inserted into the through hole in the storage body 94, and the movable iron core 1 is inserted inside the storage body 94.
Stores 02. After that, the tip of the intermediate cylinder 99 in the storage body 94 is placed over the fixed iron core 101. Then, the distal end of the cylindrical portion 96 and the distal end of the intermediate cylinder 99 are butted against each other and welded over the entire circumference. In the case of this welding, a concave groove 113 of the fixed iron core 101 exists behind a portion where the tip of the cylindrical portion 96 and the tip of the intermediate tube 99 are butted against each other. Therefore, when heating and welding the butt portions, it is difficult for the welding heat to dissipate from that portion to the surroundings (the temperature of the butt portions is difficult to lower), and as a result, it is difficult to weld the butt portions. It can also be done with good workability. Due to the above welding, the third
As shown in FIG. 3, a convex portion 136 (referred to as a Uranami) is formed that protrudes toward the inside of the groove 113. Naturally, this convex portion 136 is formed all around the circumference of the groove 113, and the fixed core 101 is prevented from moving relative to the hollow container 92 by the convex portion 136. Through the above operations, the cylindrical part 96 and the intermediate cylinder 99 are interconnected to complete the sealed hollow container 92, and the fixed core 101 is fixed to the container 92, and the driving The body 90 is completed.

As described above, the present invention has the effect of achieving the above object.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a longitudinal sectional view of the solenoid valve device, FIG. 2 is a sectional view taken along the line -
FIG. 3 is a perspective view of the coil assembly, FIG. 4 is an exploded perspective view showing the relationship between the coil body and the yoke element,
Fig. 5 is a perspective view of the outer frame, Fig. 6 is a perspective view of the yoke element, Fig. 7 is an enlarged sectional view taken along the - line, and Fig. 8 is a plan view showing how the yoke elements are assembled using an assembly jig. Figure 9 is a sectional view taken along the - line, Figure 10 is a perspective view showing the state before filling with the filler, and Figure 1
Figure 1 is a vertical cross-sectional view showing the state filled with resin.
Figure 2 is a partially enlarged sectional view taken along the line XII-XII, Figure 13 is a plan view showing different examples of the assembly jig, and Figure 14 is the XI line.
15 and 16 are longitudinal sectional views showing different examples of molds, FIG. 17 is a plan view showing still different examples of yoke element assembly jigs, and FIG. 18 is a - 19 is a plan view showing further different examples of yoke element assembly jigs, FIG. 20 is a plan view showing examples with different numbers of yoke element divisions, and FIG. 21 is a plan view showing different examples of yoke element assembly jigs. A perspective view showing an example, FIG. 22 is a partially enlarged view of FIG. 21, FIG. 23 is a view similar to FIG. 7 when using the yoke element piece of FIG. 21, and FIG. A perspective view showing a further different example, FIG. 25 is a partially enlarged view of FIG. 24, FIG. 26 is a view similar to FIG. 7 when the yoke element piece of FIG. 24 is used, and FIG. FIG. 28 is a partially enlarged view of FIG. 27, FIG. 29 is a view similar to FIG. 7 when the yoke element piece of FIG. 27 is used, and FIG. Vertical sectional view showing different examples of the driving body, 3rd
Figure 1 is an enlarged side view of the fixed core in Figure 30, Figure 32
The figure is an enlarged front view of the fixed core, FIG. 33 is a sectional view taken along the - line, FIG. 34 is a partial sectional view taken along the line - showing the fixing structure of the Kumatori coil to the main body of the core, and FIGS. 35 and 36 are the bundled bodies, respectively. Perspective views of elements, Figures 37 and 38
39 is a diagram showing the assembly process of the fixed core, FIG. 40 is an enlarged side view of the movable core in FIG. 30, and FIG. 41 is an enlarged front view of the same movable core. FIG. 42 is a sectional view taken along the - line. 44...Yoke, 46...Yoke element, 47...
... Yoke piece, 38 ... Coil body, 20 ... Fixed iron core, 31 ... Movable iron core.

Claims (1)

[Scope of Claims] 1. The coil includes a cylindrical coil and a yoke disposed outside the coil, and the yoke is characterized in that the yoke includes a large number of yoke pieces arranged in a radial manner. Electromagnetic coil assembly. 2. A method for manufacturing an electromagnetic coil assembly including a cylindrical coil and a yoke disposed outside the cylindrical coil, and the yoke including a large number of yoke pieces arranged in a radial manner with respect to each other. The manufacturing method includes a step of preparing a cylindrical coil, a step of forming a plurality of yoke elements formed by arranging a plurality of yoke pieces in a shape, and a step of forming a plurality of yoke elements on the outside of the cylindrical coil. 1. A method of manufacturing an electromagnetic coil assembly, comprising: arranging elements.