JP3479142B2 - solenoid - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid for an oil immersion type solenoid valve.

[0002]

2. Description of the Related Art The structure of a solenoid of a conventional oil-immersed solenoid valve is constructed by welding a closing member at one end using a hollow material as shown in Japanese Utility Model Laid-Open No. 59-15454. In such an oil-immersed solenoid valve, as shown in FIG. 6, for example, a hollow body 1 is welded with a closing body 2 on one side at a welded portion 1a and a fixed iron core 3 also serving as a closing body on the other side by welding 1b or mechanically. Is fitted to. A coil 6 is provided outside the hollow member 1.
O-rings 10 and 11 are provided to prevent water from entering the coil. An annular yoke 4, a case 5, a fixed iron core 3, and a movable iron core 8 are provided so that the magnetism generated by energizing the coil flows in the direction shown by the arrow in FIG. Then, when the coil is energized, a suction force is generated between the movable iron core 8 and the fixed iron core 3 in the space 12, and the movable iron core 8
Moves by being attracted to the right in FIG. By this movement, the spool provided in the solenoid valve main body (not shown) is moved via the rod 7 to switch the direction of the fluid.

In such a solenoid structure, in order to improve the magnetic efficiency, it is necessary to make the gap in the portion through which the magnetic flux passes extremely small. In FIG. 6, a gap 14 between the case 5 and the yoke 4, a gap 15 between the case 5 and the fixed iron core 3, a gap 16 at the inner diameter portion of the movable iron core 8 and the hollow member 1, a gap between the outer diameter portion of the hollow member 1 and the yoke 4. It is necessary to make 17 small. Therefore, the outer diameter of the cylindrical portion of the closing body 2 and the fixed core 3 and the hollow member 1
The outer diameters of the coil 6 and the yoke 4 into which the hollow material and the like are fitted are substantially the same, and the gap 17 shown in FIG. 6 is made as small as possible. The dimensions of the parts are fixed. Then, when assembling, the O-ring 11, from the closing body 2 side of the hollow member 1,
By externally inserting the coil 6, the yoke 4, the O-ring 10, and the case 5 into contact with the collar 3a provided on the fixed iron core 3 and screwing the nut 13 onto the screw 2a provided on the closing member 2, The case is tightened and each part is assembled together. In some cases, a yoke 4 is further provided between the coil 6 and the fixed iron core 3 in order to improve the magnetic efficiency.

By the way, the closure 2 and the hollow member 1 are joined by welding. Since welding is generally carried out while rotating the hollow member, the molten metal flows by gravity and a partial thickness unevenness occurs on the outer periphery. Therefore, as shown in FIG. 5, a part of the welded portion 1a rises above the outer diameter of the hollow material, and in an extreme case, the raised portion 18
The amount of protrusion 18a from the outer diameter of is 0.2 to 0.3 m
It may reach m. Furthermore, the maximum outer diameter dimension of the hollow material increases due to the adhesion of spatter during welding. Therefore, because of the magnetic circuit configuration, the coil is at least this welded portion 1.
a, 1b closer to the fixed core, and the yoke is welded portion 1a
When the yokes are provided on the fixed core side and on both ends of the coil, they must be assembled on the fixed core side from the welded portions 1a, 1b. Must be larger than the outer diameter of the.

[0005]

However, in order to improve the magnetic efficiency, the clearance 17 between the inner diameter of the yoke and the outer shape of the hollow material, which is externally inserted in the outer peripheral portion of the hollow material, must be made as small as possible. I want to have little or no climax.
However, it is difficult to control the amount of swelling of the welded part with a small variation and a minute dimension, and it is generally difficult to control it by the welding conditions, etc. After the welding, the swelled portion was machined by finishing such as finishing to a dimension or less. However, subjecting such a hollow member to mechanical processing has problems such as an increase in processing man-hours, a decrease in wall thickness, and a decrease in strength due to deletion of welded portions.

In view of the above-mentioned problems, an object of the present invention is to provide a solenoid which does not require finishing of a hollow material by machining, has high strength of the hollow material, is easy to assemble, and has excellent magnetic characteristics. To do.

[0007]

[Means for Solving the Problems] In order to achieve the above object, in the present invention, a tubular hollow member having a closed body welded at one end and a fixed iron core provided at the other end, and A movable iron core that is slidable in the axial direction, a coil that is inserted and attached to the outer periphery of the hollow member, and at least one annular yoke that is provided on the outer periphery of the hollow member in contact with the coil.
Is adapted to form a magnetic circuit in the yoke abuts the yoke and the coil and the fixed iron core and and the coils provided to internal and said movable iron core and the fixed iron core said movable iron core and the yoke A solenoid for an oil-immersed solenoid valve, wherein the hollow member is a hollow
It has a welded portion that rises from the outer diameter of the material,
Has an inner diameter equal to the outer diameter of the hollow material, and
The weld is divided into two or more along a line passing through the inside of the annular hole.
It was solved by not interfering with the department .

For example, the outer edge of the annular yoke divided into two or more and the case bottom edge are tapered, and after assembly, the annular yoke is divided into two or more in accordance with the axial movement due to the taper of the case bottom edge. The inner diameter of the hollow material is moved in the direction orthogonal to the axis so that the inner diameter of the hollow material has the same inner diameter as the outer diameter of the hollow material.

[0009]

Since the annular yoke is divided into two or more, it can be assembled without passing through the bulge of the welded portion of the hollow material. Therefore, by setting the inner diameter of the annular yoke to be the same as the outer diameter of the hollow material, the hollow material outer diameter and the yoke are
The gap is very small.

Further, since the annular yoke divided into two or more is moved in the radial direction with the movement of the case at the time of assembling, it does not pass through the bulging portion of the welded portion of the hollow material. After being assembled, the inner diameter portion of the annular yoke comes into contact with the outer diameter of the hollow member without a gap as the case moves.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. In FIGS. 1 and 2, a hollow member 1 is welded with a closing member 2 at one end and a fixed iron core 3 at the other end at welded portions 1a and 1b, respectively. On the outer side of the hollow member 1, the coil 6 is abutted against the flange 3a of the fixed iron core 3, and the coil 6 is externally inserted to prevent water from entering the coil.
0 and 11 are provided. The coil 6 uses an electric wire for connecting the bobbin 6a, the winding 6b wound around the bobbin, and an external power source for the winding, and a packing 6c for preventing water from entering from the outer peripheral portion of the electric wire is molded. The material 6d is integrally formed. Further, two semicircular fan-shaped yokes 4a and 4b are provided on the outer side of the hollow member 1 so as to abut the coil 6, and a case 5 is attached so as to cover these parts. The case 5 is sandwiched between the collar 3a of the hollow member 1 and the nut 13 screwed to the screw 2a provided on the closing member 2,
A coil is fixed and a solenoid is formed.

A hollow core 1f of the hollow member 1 is provided with a movable iron core 8 slidable in the axial direction and a rod 7 for taking out a suction force generated in a gap 12 between the closing bodies 2 via the movable iron core to the outside. It is provided. Further, a spacer 9 is provided between the movable iron core 8 and the fixed iron core 3 in the case of a DC solenoid in order to improve responsiveness during demagnetization.

As shown in FIG. 2, the yoke 4 is divided into two parts, and is formed by two parts of semi-circular fan-shaped yokes 4a and 4b. The inner diameter 4c of the yoke 4 is the same as the outer diameter 1c of the hollow material 1, and the gap 17 between the inner diameter of the yoke and the outer diameter of the hollow material is substantially zero. On the other hand, the outer diameter 4d of the yoke is set to have an inner diameter 5a of the case 5 and a slight gap 14 within a range that does not hinder the assembly. The inner diameter 6a of the coil 6 is larger than the maximum outer diameter 1d of the hollow member 1 so that the coil 6 can be assembled in the welded portions 1a and 1b without interfering with the bulge generated during welding.

Next, the operation of the first embodiment will be described.
When assembling, first, coil 6, O-ring 10, 1
1 is inserted into the hollow member 1. Since the inner diameter 6a of the coil is larger than the outer diameter 1d of the raised portion of the hollow material, it can pass through the raised portions of the welded portions 1a and 1b of the hollow material 1 without any trouble. Then, the halved yokes 4a and 4b are assembled from the radial direction of the hollow material, the case 5 is further inserted from the closing material 2 side, and finally the nut 13 is screwed to the threaded portion 2a of the hollow material. Since the yoke 4 is divided into two, it is not necessary to assemble the yoke 4 through the welded portion 1a of the hollow material.
Further, since the inner radii of the two split yokes 4a and 4b have the same dimensions as the outer diameter 1c of the hollow member 1 and the outer diameter 4d has the same dimension as the inner diameter 5a of the case, the magnetic efficiency after assembly is improved. The voids 14 and 17 required for increasing the height are at least as large as those before the conventional division into two.

Magnetism generated by energizing the coil 6 flows in the order of the case 5, the fixed iron core 3, the movable iron core 8, the split yoke 4, and the case 5, as shown by the arrow. The air gap between the coil inner diameter 6a and the hollow member outer diameter 1c is not affected in terms of magnetic efficiency. Further, the gap 4e between the two divided yokes works in the direction of reducing the magnetic path cross-sectional area, but the gap is made minute, and the magnetic path is formed in the radial direction, and the magnetic path in the circumferential direction passing through the gap is formed. Since it does not need to be formed, the influence on the magnetic efficiency is small.

Next, a second embodiment of the present invention will be described with reference to the drawings. 3 is a sectional view of a main part of a second embodiment of the present invention, and FIG. 4 is a sectional view taken along the line BB of FIG. In the first embodiment, the inner and outer diameters of the yoke were the same as the conventional dimensions, but in the conventional dimensions, a slight gap was required to assemble the hollow member and the yoke, and the yoke and the case. It is ideal that this gap should not be originally present, and the second embodiment has a smaller gap. The same parts as those in the first embodiment described above are designated by the same reference numerals, and a part of the description will be omitted.

As shown in FIGS. 3 and 4, the yoke 41 is radially divided into three parts from the axial center, the inner diameter 42 of the yoke is made equal to the outer diameter 1c of the hollow material, and the outer diameter 43 is the inner diameter 52 of the case 51. A tapered portion 44 having a slightly smaller outermost diameter is formed. The edge portion 54 of the bottom portion 53 of the case 51 has a tapered portion 5 whose inner diameter gradually decreases toward the bottom portion.
5 are provided. The tapered portions 44 and 55 have substantially the same shape, and the minimum diameter portion 56 of the case side tapered portion 55 is slightly smaller than the minimum diameter portion 45 of the yoke side tapered portion 44. The taper portion is exaggeratedly illustrated for the sake of explanation.

According to this structure, when the solenoid is assembled, the solenoid is assembled in the same manner as in the first embodiment, but as the nut 13 is screwed in, the case 51 and the tapered portions 44 and 45 of the yoke 41 are abuttingly fitted. In combination, the yoke outer diameter is pressed down so that the yoke moves toward the axis, and the inner diameter portion 42 of the yoke abuts the outer diameter portion 1c of the hollow member. Therefore, the case 51, the yoke 41, and the hollow member 1 can be assembled without any gap. In addition, each dimension is such that the inner diameter of the yoke does not become an excessive force when coming into contact with the outer diameter portion of the hollow material, and the case,
It goes without saying that the flat portion of the yoke is set to abut.

[0019]

According to the present invention, since the yoke is divided into two or more, the welded portion or the like having the outer diameter of the hollow material is formed.
It is easy to assemble without interfering with the upward movement, and has magnetic properties comparable to those of conventional products. In addition, melt the hollow material
Since no post-welding machining is performed, it is possible to obtain a hollow material having a high strength without a decrease in wall thickness and the like, and having a reduced number of finishing processing steps and costs after welding. Also, since there is no machining after welding, it is possible to use thin hollow materials,
It is also possible to provide a solenoid having better magnetic characteristics.

Furthermore, since the yoke is moved in the axial direction and the yoke, the hollow member and the case are assembled in a shape close to zero, a solenoid having more excellent magnetic characteristics can be provided.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a solenoid that is a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a vertical cross-sectional view of a solenoid that is a second embodiment of the present invention.

FIG. 4 is a sectional view taken along line BB of FIG.

FIG. 5 is an enlarged cross-sectional view of a welded portion of a hollow material.

FIG. 6 is a vertical sectional view of a conventional solenoid.

[Explanation of symbols]

1 hollow material 2 closure materials 3 fixed iron core 4, 4a, 4b, 41 yoke 5 cases 6 coils 8 movable iron core

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography Sho 59-109107 (JP, U) Sho 59-67681 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01F 7/127 H01F 7/16

Claims (2)

(57) [Claims] 1. A tubular hollow member having a closed body welded at one end and a fixed iron core provided at the other end; a movable iron core slidable in the hollow member in the axial direction; A coil inserted into the outer periphery, at least one annular yoke provided on the outer periphery of the hollow member in contact with the coil, the yoke contacting with the yoke, the coil, the fixed iron core, and the movable iron core. a solenoid oil Hitakatachi solenoid valve having a casing which is adapted to form a magnetic circuit is provided to incorporate and said coil and said fixed iron core and the movable iron core and the yoke, said hollow The material is the outer diameter of the hollow material
It has a raised weld and the yoke is
Has an inner diameter equal to the outer diameter of the hollow material and is in an annular hole
It is divided into two or more along the line passing through the side and interferes with the weld
Solenoids that are characterized by not being . 2. The outer edge of the annular yoke divided into two or more parts is urged by the bottom edge of the case after assembling so that the inner diameter portion of the annular yoke is in contact with the outer diameter of the hollow member. The solenoid according to claim 1, which is characterized in that.