JP2005308040A - Solenoid valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent flow-in of unnecessary resin material by easily installing a yoke and a coil corresponding to a second one, a yoke corresponding to a third one and a yoke corresponding to a first one in order in a mold in a short time without embedding these in the mold. <P>SOLUTION: In a solenoid valve formed by inserting a coil assembly 41 provided with a coil winding 46 into a tube assembly 42 provided with a movable iron core 60 to form a solenoid 40 of a molded body 55, the coil assembly 41 is provided with the coil 44, the first and the second yokes 51 and 52 to be engaged with a circumferential side wall surface of the coil 44 formed within a first and a second flanges 47a and 47b formed at both ends of a coil barrel 47, and the third yoke 53 provided with the coil 44 and the first and the second yokes inside thereof. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electromagnetic valve that controls a pressurized fluid by displacing a spool in accordance with an applied current, and more particularly to an assembly of a coil bobbin.

As shown in FIG. 10, the coil bobbin of the electromagnetic valve is assembled by the yoke 12, the coil 5, and the third equivalent to the fixed mold 25 (all of which are described in Patent Document 1) forming the mold 24. The corresponding yoke 13 and the first corresponding yoke 11 (both of the symbols described in Patent Document 1) are mounted in this order, and the movable molds 26 to 28 are combined with the fixed mold 25, respectively, and the molding (not shown) is performed. By using a machine, for example, an injection molding machine, a resin material is injected into the mold 24 to form a coil assembly having a required shape.
No. 6-14406

However, the yoke 12 corresponding to the second, the coil 5, the yoke 13 corresponding to the third, and the yoke 11 corresponding to the first, which are members of the coil bobbin, must be sequentially attached to the fixed die 25. 12, the assembly of the coil 5, the yoke 13, and the yoke 11 to mount the molding die 24 takes time, and the injection molding time becomes longer, which increases the cost.
Further, when the machining accuracy of the yoke 12, the coil 5, the yoke 13, and the yoke 11 is low, the resin material flows between them at the time of molding, so that the troublesome work of scraping off the resin material that has flowed in after the mold has been opened. Sometimes it was necessary.
The present invention has been made in order to solve the above-described problems, and sequentially attaches the yoke corresponding to the second, the coil, the yoke corresponding to the third, and the yoke corresponding to the first to the mold. It is an object of the present invention to provide a solenoid characterized in that it can be easily mounted on a molding die in a short time and can prevent the flow of unnecessary resin material.

In order to achieve the above object, the present invention provides a tube assembly including a movable iron core,
A coil assembly with coil windings;
In the electromagnetic valve in which the coil assembly is inserted into the tube assembly and a solenoid is formed by a molded body,
The coil assembly includes a coil bobbin having a protrusion on each of first and second flanges formed radially at both ends of a hollow winding drum,
First and second yokes engaged with circumferential side wall surfaces of the first and second rods;
A third yoke in which the coil bobbin, the first and second yokes are provided;
With
The bobbin and the first and second yokes are inserted into the third yoke.

According to the present invention, the coil bobbin and the first to third yokes can be easily integrated, and these can be closely engaged, so that the molding material is placed between the coil bobbin and the first to third yokes. Inflow can be prevented, and the time for assembling the coil assembly can be shortened, thereby reducing the cost.
In this case, the first and second rods include a pair of protrusions oriented in the axial direction of the winding drum,
The first ridge is formed in a circular shape, the second ridge is formed in a semicircular shape with one side being concentric, the other side is eccentric and formed in a semicircular shape, and a protrusion oriented in the axial direction is provided on the outer peripheral portion. In this case, the coil bobbin and the third yoke can be easily engaged with each other.
Furthermore, if the third yoke has an opening with which a protrusion formed on the first flange is engaged, the third yoke may be engaged with the coil bobbin and prevented from falling off.
Further, if the pair of openings are formed so as to face each other in the axial direction, the direction of the third yoke may not be restricted when the coil bobbin and the third yoke are engaged.
Furthermore, the projection may prevent the first and second yokes from being detached from the coil bobbin when the first and second yokes are fitted.

In the present invention, the yokes can be reliably assembled to the coil bobbin in a short time, so that they are not disassembled during transportation and can be mounted on the mold in a short time, so that the molding cycle time can be shortened. The molding cost can be reduced.
Furthermore, since the shape of the fitting part between each yoke is circular shape, the influence on the assembly operation by processing accuracy can be reduced.
In addition, the contact surface of each yoke is a combination structure having a flat surface, and since the yoke is not deformed by the assembling work, the gap between the contact surfaces can be reduced, and the suction force and the like are not reduced. Therefore, the magnetic properties are excellent.

The solenoid 40 according to the embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a schematic structure of a solenoid 40 according to an embodiment of the present invention.
The solenoid 40 includes a cylindrical coil assembly 41 having a hollow portion and a tube assembly 42 inserted through the hollow portion of the coil assembly 41, which are integrated by a resin fixing nut 43. Reference numerals 44 to 55 denote known members in the coil assembly 41. That is, the coil 44 is configured by winding the coil winding 46 around the outer peripheral surface of a coil bobbin 45 formed of a synthetic resin material, for example, a thermoplastic resin such as nylon or PPS. The coil bobbin 45 has a hollow winding drum 47, and flanges 47a and 47b are integrally formed at both ends of the winding drum 47 in the radial direction. Reference numeral 48 is a lead wire of the coil winding 46, and 49 is a plug pin for electrical contact.

The external magnetic circuit body 50 surrounding the coil 44 includes an annular first yoke 51 attached to one end of the coil bobbin 45, a second yoke 52 attached to the other end, and the yokes 51, 52.
And a third yoke 53 magnetically connected to each other. These first to third yokes 51 to 53 are all made of a magnetic material such as pure iron or low carbon steel. The first and second yokes 51 and 52 are formed of a single plate material, but it is needless to say that a plurality of the materials may be stacked.
The inner diameters of the first yoke 51 and the second yoke 52 are formed to be slightly larger than the outer diameter of the tube assembly 42. The third yoke 53 is formed in a cylindrical shape, and a projecting portion 54 for projecting the plug pin 49 is formed at one end thereof. The molded body 55 is formed in such a state that the coil 44 and the first to third yokes 51 to 53 are embedded in the molding material when injection molding is performed. As the molding material of the molded body 55, a thermosetting resin having high heat resistance, for example, an epoxy resin is employed.

Reference numerals 56 to 59 denote known members in the tube assembly 42. The fixed iron core 56 is made of a high magnetic permeability material such as magnetic stainless steel, and has a connecting portion 57 to a valve device (not shown). The hollow cylindrical member 58 is formed of a member 58a formed of a high magnetic permeability material such as magnetic stainless steel and a member 58b formed of an extremely low magnetic permeability material such as nonmagnetic stainless steel. Reference numeral 59 indicates a closing member.
The fixed iron core 56, the members 58a and 58b, and the closing member 59 are integrated by, for example, welding so that the inside of the hollow cylindrical member 58 is sealed. The movable iron core 60 and the interlocking rod 61 are formed of a material that is not magnetized even if work hardened, such as high manganese steel nitrogen-containing stainless steel. Reference numeral 62 indicates a push pin for manual operation.

  3 is a longitudinal sectional view showing the details of the coil 44, and FIG. 4 is an outline view in the direction of arrow Z in FIG. A pair of protrusions 63a and 63b and protrusions 64a and 64b are formed on the circumferential side wall surfaces of the flanges 47a and 47b of the coil bobbin 45 so as to face each other in a direction orthogonal to the axial direction. Further, as shown in FIG. 3, the flange 47b is formed in a concentric circular shape. On the other hand, as shown in FIG. 4, the flange 47a is formed with a concentric semicircular shape 65a on one side in a direction orthogonal to the axial direction passing through the protrusions 63a and 63b, and on the other side from the axial center. A semicircular shape 65b that decenters δ is formed. The amount of eccentricity δ is related to the thickness h in the diameter direction of the protrusion 66 formed on the circumferential side wall surface of the semicircular shape 65a along the direction orthogonal to the axial direction passing through the protrusions 63a and 603b of the flange 47a. h ≦ δ is set.

FIG. 5 is a schematic structural diagram showing a state in which the third yoke 53 is assembled to the coil 44, and FIG. 6 is a schematic diagram in the direction of arrow Y in FIG.
As shown in FIGS. 5 and 6, when the outer peripheral surface of the coil 44 is mounted on the inner peripheral surface 53a of the third yoke 53, the yoke 53 is inclined according to the height of the protrusion 66 of the flange 47a. When the yoke 53 is displaced in the direction of arrow A, the projection 66 is inserted into the opening 67a of the yoke 53, and the outer peripheral surface of the flange 47a is mounted on the inner peripheral surface 53a of the yoke 53, so that the coil 44 is connected to the third portion. Movement in the axial direction within the yoke 53 is restricted, and the coil 44 is integrated with the third yoke 53. Thereby, the projection 66 formed on the flange 47a is inserted into the opening 67a formed on the third yoke 53. Therefore, the coil 44 and the third yoke 53 are integrally attached to the fixed die 74 (see FIG. 2).
In this case, the openings 67 a and 67 b have an engaging function when the coil 44 is inserted into the third yoke 53. Furthermore, the reason why the openings 67a and 67b of the yoke 53 are formed at symmetrical positions along the axial direction is to avoid limiting the orientation of the yoke 53 during assembly work. Further, the openings 68 and 69 formed in the yoke 53 have a function of allowing a molding material to flow in during molding.

  7 is a schematic structural diagram in which the coil 44 and the first to third yokes 51 to 53 are assembled and formed in the coil assembly 41, FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 7, and FIG. 9 is an arrow X in FIG. It is an external view of a viewing direction. As shown in FIGS. 7 to 9, protrusions 63 a and 63 b and protrusions 64 a and 64 b formed on the circumferential side wall surfaces of the flanges 47 a and 47 b of the coil bobbin 45 attached to the inner peripheral surface 53 a of the third yoke 53. Are inserted into the holes 70 a and 70 b and the holes 71 a and 71 b formed in the first yoke 51 and the second yoke 52. Further, the projections 63a and 63b and the claws 72a and 72b and the claws 73a and 73b formed at the tips of the projections 64a and 64b prevent the yokes 51 and 52 from being detached through the holes 70a and 70b and the holes 71a and 71b. ing. Therefore, the first and second yokes 51 and 52 are prevented from being detached from the coil bobbin 45 in the axial direction. Further, the second and third yokes 51 and 52 are prevented from being displaced in the circumferential direction by the protrusions 63a and 63b and the protrusions 64a and 64b.

The solenoid 40 according to the embodiment of the present invention is basically configured as described above. Next, a case where the solenoid 40 is assembled will be described.
First, as shown in FIGS. 3 and 4, a predetermined amount of coil winding 46 is wound around a winding drum 47 of a coil bobbin 45, and lead wires 48 and plug pins 49 of the coil winding 46 are formed. 49 is attached to the protrusion 54 of the flange 47a.
Next, as shown in FIGS. 5 and 6, the projection 66 of the flange 47 a of the coil bobbin 45 is inserted into the opening 67 a of the third yoke 53, and the outer peripheral surface of the coil bobbin 45 is connected to the third yoke 53 on the inner peripheral surface. The coil bobbin 45 and the third yoke 53 are integrally formed. In this case, since the projection 66 of the flange 47a is inserted into the opening 67a of the third yoke 53, the coil bobbin 45 is accommodated in the yoke 53 without being displaced in the axial direction.

  7-9, the projections 63a, 63b and the projections 64a, 64b formed on the outer wall surfaces of the flanges 47a, 47b of the coil bobbin 45 are respectively connected to the first yoke 51 and the second yoke 52. The holes 70a, 70b and 71a, 71b provided are inserted, the first yoke 51 and the second yoke 52 are engaged with the flanges 47a, 47b, and the outer peripheral surfaces of the first and second yokes 51, 52 Is provided around the inner peripheral surface 53 a of the third yoke 53. Therefore, the first and second yokes 51 and 52 are prevented from being detached from the coil 44 and the third yoke 53 by the claws 72a and 72b and the claws 73a and 73b formed on the protrusions 63a and 63b and the protrusions 64a and 64b. It is. Eventually, the coil 44 and the first to third yokes 51 to 53 are maintained in an integrally coupled state.

Next, as shown in FIGS. 7 to 9, the coil assembly 41 is formed in the coil assembly 41 in a state where the coil 44 and the first to third yokes 51 to 53 are integrally formed as shown in FIG. For example, when the molding material (not shown) is attached to the fixed die 74 and the movable dies 75 to 77 and injected into the molding die by an injection molding machine, the molding material is fixed through the injection port 78 and the openings 68 and 69. The coil assembly 41 is formed by a molded body 55 that is press-fitted into the mold 44 and the movable molds 45 to 47 and in which the coil 44 and the first to third yokes 51 to 53 are integrated. After molding, the fixed mold 74 and the movable molds 75 to 77 are opened, and the molded body 55 is taken out.
Then, as shown in FIG. 1, the molded body 55 and the O-ring 79 are inserted into the outer periphery of the fixed iron core 56 and the hollow cylindrical member 58 that are members of the tube assembly 42, and the fixing nut 43 is screwed onto the closing body 59. By doing so, the solenoid 40 is formed.

It is a longitudinal section showing a schematic structure of a solenoid valve concerning an embodiment of the invention. It is a longitudinal cross-sectional view which shows the schematic structure which mounted | wore the shaping | molding die with the coil assembly and tube assembly of FIG. It is a longitudinal cross-sectional view of the coil of FIG. It is an external view of the Z arrow direction of FIG. It is explanatory drawing showing the engagement state of the coil of FIG. 1, and a 3rd yoke. FIG. 4 is an external view in the direction of arrow Y in FIG. 3. It is a longitudinal cross-sectional view which shows schematic structure of the coil assembly of FIG. It is sectional drawing of the VIII-VIII line of FIG. It is an external view of the X arrow direction of FIG. It is the longitudinal cross-sectional view which attached the yoke and the coil to the conventional shaping | molding die.

Explanation of symbols

40 Solenoid 41 Coil assembly 42 Tube assembly 51 First yoke 52 Second yoke 53 Third yoke 55 Molded body 56 Fixed iron core 60 Movable iron core 63a, 63b, 64a, 64b Projection 70a, 70b, 70a, 70b Hole 72a, 72b, 73a, 73b nails

Claims (5)

A tube assembly with a movable iron core;
A coil assembly with coil windings;
In the electromagnetic valve in which the coil assembly is inserted into the tube assembly and a solenoid is formed by a molded body,
The coil assembly includes a coil bobbin having first and second flanges formed radially at both ends of a hollow winding drum,
First and second yokes engaged with circumferential side wall surfaces of the first and second rods;
A third yoke in which the coil bobbin, the first and second yokes are provided;
With
An electromagnetic valve formed by inserting the bobbin and the first and second yokes into the third yoke. The solenoid valve according to claim 1, wherein
The first and second collars include a pair of protrusions oriented in the axial direction of the winding drum, the first collar is formed in a circular shape, and the second collar is a semicircular concentric on one side. A solenoid valve characterized in that it is formed in a shape, the other side is eccentric and formed in a semicircular shape, and a projection directed in an axial direction is provided on an outer peripheral portion. The solenoid valve according to claim 1 or 2,
The electromagnetic valve, wherein the third yoke has an opening with which a protrusion formed on the first flange is engaged. The solenoid valve according to any one of claims 1 to 3,
The electromagnetic valve according to claim 1, wherein a pair of the openings are formed to face each other in the axial direction. The solenoid valve according to claim 2,
The electromagnetic valve according to claim 1, wherein the protrusion is fitted with the first and second yokes.

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