JP4698876B2 - electromagnet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnet in which an outer periphery of a coil bobbin around which a coil is wound is a resin mold portion, and a lead wire electrically connected to the coil is led out from the resin mold portion.
[0002]
[Prior art]
This type of electromagnet has rubber boots attached and bonded to the lead wire lead-out part of the resin mold part that leads the lead wire electrically connected to the lead-out part of the coil winding by soldering. The waterproofing is obtained at the lead-out end of the lead wire. (For example, see Utility Model Registration No. 2541524).
[0003]
[Problems to be solved by the invention]
However, in such a conventional electromagnet, since the rubber boot bonded to the lead wire lead-out portion of the resin mold portion protrudes outward, the entire electromagnet becomes large.
[0004]
An object of the present invention is to provide an electromagnet that obtains good waterproof properties by blocking the penetration of water from the outside to the coil through the outer circumference of the lead wire without increasing the size of the entire electromagnet.
[0005]
[Means for Solving the Problems]
For this reason, in the present invention, the coil is wound around the coil bobbin so as to generate a suction force by which the movable iron core is attracted to the fixed iron core by energization, and the coil bobbin forms flanges at both ends in the axial direction, is formed and electrically connecting the lead wire to a coil wound on the coil bobbin, to derive the lead wires which are electrically connected to the coil from the lead-out portion of the coil bobbin, shrink radially inward it becomes flexible by heating the lead The outer end of the tube is fitted to the lead wire, and one end in the axial direction of the tube is brought into contact with the lead-out portion of the coil bobbin. The lead wire with the tube fitted passes through the grommet to reach the external power supply. to lead section abuts to the abutting axial end portion facing the one axial end portions, wound around the outer fitting the lead wires and the coil tube coil The outer periphery and grommet bottle was molded with a thermosetting resin to form a resin mold portion, the inner provided to derive the lead wires to the outside from the resin mold portion, the tube was fitted to the lead wire by heat during the mold The peripheral surface is in close contact with the outer peripheral surface of the lead wire and the outer peripheral surface is in close contact with the resin mold portion.
[0006]
According to the present invention, when the coil is energized from the external power source through the lead wire, a suction force is generated and the movable iron core is attracted to the fixed iron core. When it is molded, it becomes flexible due to heating during molding, shrinks in the inner diameter direction, the inner peripheral surface closely adheres to the outer periphery of the lead wire, and the outer peripheral surface adheres to the resin mold portion and travels from the outside to the outer peripheral surface of the lead wire. Block the ingress of water. And the tube that is externally fitted to the lead wire is provided inside the resin mold part, as compared with the conventional electromagnet, such as a rubber boot that protrudes outwardly and adheres to the lead wire lead-out part of the resin mold part, Without enlarging the entire electromagnet, good water resistance can be obtained by blocking the intrusion of water from the outside through the lead wire to the coil.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention in which an electromagnet is applied to an electromagnetic valve will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a cylindrical coil bobbin that has an insertion hole 2 that extends in the axial direction at the center and winds the coil 3 between flanges formed at both ends in the axial direction. Two lead wires 4A,... Electrically connected to each other by soldering at the end are led out from an opening portion 5 formed in one flange. Each of the lead wires 4A,... Abuts the tubes 6A,... To the lead-out portion 5, and is externally fitted. The lead wires 4A,. Are inserted through the insertion holes 7A,... To an external power source (not shown), and the grommet 7 is brought into contact with the other axial end opposite to the axial one end of the tube 6A,. . 8 is a resin mold portion, and the outer periphery of the coil bobbin 1 is thermoset in the above-described state in which the tube 6A externally fitted to the lead wire 4A is brought into contact with the lead portion 5 and the grommet 7 is further brought into contact with the tube 6A. The coil bobbin 1, the coil 3, the lead wire 4A,..., The tube 6A,..., And the grommet 7 are integrally formed, and a lead wire lead-out portion 9 is provided at one end thereof. The grommet 7 is formed of an elastic material made of rubber, and a part of the grommet 7 protrudes outwardly from the lead wire lead-out portion 9, and the boundary between the inside and outside of the lead wire lead-out portion 9 in the lead wires 4A,. This prevents contact with the ridge portion of the wire lead-out portion 9 and damage.
[0008]
The tubes 6A,... Are made of a material such as a polyolefin resin, an elastomer, or a fluororesin that becomes flexible by heating and contracts in the inner diameter direction, and are sold under the registered trademark “Sumitube” of Sumitomo Electric Fine Polymer Co., Ltd. When the tube 6A is externally fitted to the lead wire 4A,..., The tube 6A has a radial dimension with a gap between the lead wire 4A,. It becomes flexible and shrinks due to heating during molding, and the inner peripheral surface is in close contact with the lead wire 4A,... And the outer peripheral surface is in close contact with the resin mold portion 8, and the lead wire 4A,. Blocks intrusion to the coil 3 of hot water.
[0009]
Reference numeral 10 denotes a fixed iron core. A columnar iron core portion 10B protruding from the center of the disk-shaped flange portion 10A is inserted and fixed in the insertion hole 2 of the coil bobbin 1, and a concave portion 10C is formed on the end face of the inserted and fixed iron core portion 10B. Forming. Reference numeral 11 denotes a movable iron core, which is inserted into the insertion hole 2 of the coil bobbin 1 so as to be slidable in the axial direction so as to be slidable in the axial direction. The recess 10C is slidably inserted in the axial direction. A spring 13 is interposed between the fixed iron core 10 and the core member 12 of the movable iron core 11 and urges the movable iron core 11 in a direction away from the fixed iron core 10. Reference numeral 14 denotes a cylindrical case covering the resin mold portion 8. One end in the axial direction is brought into contact with the flange portion 10 </ b> A of the fixed iron core 10, and the lead wire lead-out portion 9 of the resin mold portion 8 is formed from a notch 14 </ b> A formed on the one end side. It extends outward. A yoke 15 is in contact with the other axial end of the case 14, and a movable iron core 11 extending from the coil block 1 is inserted through the inside. The fixed core 10 and the yoke 15 are fixed by a bolt member (not shown) with the case 14 sandwiched between the flange portion 10A of the fixed core 10 and the yoke 15, and the movable core 11 is fixed by energizing the coil 3. A magnetic circuit that generates an attractive force attracted to the iron core 10 is composed of a fixed iron core 10, a movable iron core 11, a case 14, and a yoke 15.
[0010]
Reference numeral 16 denotes a valve body, which is fixed to the yoke 15 on the side facing the contact side of the case 14 with a bolt member (not shown), and is drilled to connect the fluid inflow channel 17 and the outflow channel 18 inside. A valve seat 19 is formed at the connection point between the inflow channel 17 and the outflow channel 18. A distal end portion of the movable iron core 11 extends inside the valve body 16, and a valve body 20 seated on the valve seat 19 is attached to the distal end portion of the movable iron core 11. The valve body 20 is seated on the valve seat 19 as the movable iron core 11 is energized in the direction away from the fixed iron core 10 by the spring 13 force when the coil 3 is de-energized, and the inflow passage 17 and the outflow passage 18. And when the movable iron core 11 is attracted to the fixed iron core 10 against the force of the spring 13 by energizing the coil 3, it separates from the valve seat 19 and flows into the inflow passage 17 and the outflow flow. Communication with the path 18 is provided.
[0011]
Next, the operation of this configuration will be described.
FIG. 1 shows a state in which the coil 3 is not energized, the movable iron core 11 is urged in a direction away from the fixed iron core 10 by the force of the spring 13, and the valve body 20 is seated on the valve seat 19, The space between the outflow passage 18 is blocked.
[0012]
In this state, when the coil 3 is energized from the external power source through the lead wires 4A,..., The movable iron core 11 is attracted to the fixed iron core 10 against the force of the spring 13, and the valve body 20 is separated from the valve seat 19. The inflow channel 17 and the outflow channel 18 are communicated with each other. When the coil 3 is deenergized, the movable iron core 11 and the valve body 20 are restored to the state shown in FIG.
[0013]
With this operation, the tubes 6A externally fitted to the lead wires 4A,... Are softened by heating during molding when the resin mold portion 8 is formed of thermosetting resin, and contract in the inner diameter direction. Leads closely to the outer peripheral surface and the outer peripheral surface closely contacts the resin mold portion 8 to block the penetration of water from the outside through the lead wire 4A,. Tubes 6A,... Externally fitted to the lead wires 4A,... Are provided inside the resin mold 8 and have rubber boots protruding outwardly at the lead wire lead-out portion of the resin mold, such as conventional electromagnets. It is possible to obtain a good waterproof property by blocking the penetration of water from the outside to the coil 3 through the lead wires 4A,. In addition, the tubes 6A, ... are made flexible by heating in the process of forming the resin mold portion 8 with a thermosetting resin, and are in close contact with the lead wire 4A, ... the outer peripheral surface and the resin mold portion 8, so compared to conventional electromagnets, The work of attaching and bonding the rubber boot to the lead wire lead-out portion of the resin mold portion can be eliminated, and the production can be simplified. Further, one end of the tube 6A, which is externally fitted to the lead wire 4A, is brought into contact with the lead portion 5 of the coil bobbin 1, and the grommet is connected to the other end in the axial direction facing the one end of the tube 6A,. 7, the outer periphery of the coil bobbin 1 is molded with a thermosetting resin, and the coil bobbin 1, coil 3, lead wire 4 A,..., Tube 6 A,. Therefore, when the resin mold portion 8 is formed, the grommet 7 can be held in contact with the tubes 6A, so that the grommet 7 can be easily positioned.
[0014]
In one embodiment, the tubes 6A,... Used are those sold under the registered trademark “Sumitube” of Sumitomo Electric Fine Polymer Co., Ltd., but are not limited to this. The electromagnet may be applied to the electromagnetic valve as long as it can be waterproofed by contracting in the direction, but may be applied to other devices depending on the application.
[0015]
【The invention's effect】
As described above, in the present invention , the coil is wound around the coil bobbin so as to generate a suction force by which the movable iron core is attracted to the fixed iron core by energization, and the coil bobbin forms a flange at both ends in the axial direction, The lead wire is electrically connected to the coil wound around the coil bobbin, the lead wire electrically connected to the coil is led out from the lead portion of the coil bobbin, and the lead wire becomes flexible by heating and contracts in the inner diameter direction. The lead wire with the tube fitted through the grommet leads to the external power supply, and the grommet is connected to the lead wire of the tube. to abut the abutting axial end portion facing the one axial end portion has a coil wound around the outer fitting the lead wires and the coil tubing The outer periphery and grommet bottle was molded with a thermosetting resin to form a resin mold portion, the inner provided to derive the lead wires to the outside from the resin mold portion, the tube was fitted to the lead wire by heat during the mold Since the peripheral surface is in close contact with the outer peripheral surface of the lead wire and the outer peripheral surface is in close contact with the resin mold portion, the penetration of water that has traveled from the outside to the outer peripheral surface of the lead wire can be blocked by a tube. Compared with conventional electromagnets that have rubber boots protruding and bonded to the lead wire lead-out part of the resin mold part, the entire electromagnet is not increased in size and transmitted from the outside through the lead wire. Good water resistance can be obtained by blocking the intrusion of water to the coil. In addition, the tube becomes flexible by heating in the process of forming the resin mold part with a thermosetting resin and adheres closely to the outer peripheral surface of the lead wire and the resin mold part, so the lead wire lead-out part of the resin mold part compared to conventional electromagnets The work of attaching and bonding the rubber boots can be eliminated, and the production can be simplified. Furthermore, the outer periphery of the coil bobbin is in a state in which one end in the axial direction of the tube externally fitted to the lead wire is brought into contact with the lead-out portion of the coil bobbin, and the grommet is in contact with the other axial end opposite to one end in the axial direction of the tube. Is molded with thermosetting resin, and the coil bobbin, coil, lead wire, tube, and grommet are integrally formed to form the resin mold part, so the grommet can be held in contact with the tube when forming the resin mold part. The grommet can be easily positioned.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention in which an electromagnet is applied to an electromagnetic valve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Coil bobbin 3 Coil 4A Lead wire 6A Tube 8 Resin mold part 10 Fixed iron core 11 Movable iron core

Claims (1)

The coil is wound around the coil bobbin so that the movable iron core is attracted to the fixed iron core by energization. The coil bobbin forms flanges at both ends in the axial direction, and forms a lead-out part at one flange, and winds around the coil bobbin. electrically connecting the lead wire to a coil turn, a lead wire electrically connected to the coil derived from lead section of the coil bobbin, fitted around the tube to contract radially inward becomes flexible by heating leads, One end in the axial direction of the tube that is externally fitted to the lead wire is brought into contact with the lead portion of the coil bobbin, and the lead wire that is externally fitted to the tube is inserted into the grommet to reach the external power supply. abuts the other axial end facing the direction end portion, the outer periphery of the coil bobbin by winding an externally fitted lead wire and the coil tube and Gurome Molded the door with a thermosetting resin to form a resin mold portion, provided to derive the lead wires to the outside from the resin mold portion, the inner peripheral surface tube fitted to the lead wires by heating during the mold leads An electromagnet characterized by being in close contact with the outer peripheral surface of the wire and in close contact with the resin mold portion.

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