JP2539077Y2 - 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, and more particularly to a solenoid suitable for a solenoid valve.

[0002]

2. Description of the Related Art A bobbin wound with a coil, a fixed iron core mounted in a center hole of the bobbin, a magnetic frame and a magnetic plate surrounding the bobbin, and a pair of coils mounted on the bobbin and electrically connected to ends of the coil. Having a coil terminal of, a solenoid assembly molded with an insulating sealing material,
Solenoids having a movable iron core slidably inserted into the center hole of the bobbin are well known without particular examples. The solenoid assembly of the above-mentioned known solenoid is installed in a mold for molding, and is molded with an insulating sealing material.

However, in the molding of the above-mentioned insulating sealing material by a mold, it is necessary to press the mold against the coil terminal in order to prevent the insulating sealing material from leaking from around the coil terminal projecting outward from the inside of the mold. There is. Therefore, there is a problem that the yield of the solenoid is low because the coil terminal is damaged or the coil is disconnected at the coil connection portion by a large force directly acting on the coil terminal.

[0004]

A problem to be solved by the present invention is to increase the yield of a solenoid molded with an insulating sealing material.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a bobbin wound with a coil, a fixed iron core mounted in a center hole of the bobbin, a magnetic frame and a magnetic plate surrounding these, and the bobbin. A solenoid assembly having a pair of coil terminals attached to the end of the coil and electrically connected thereto, and molded with an insulating sealing material;
In a solenoid having a movable iron core slidably inserted into a center hole of the bobbin, the coil terminal is formed of an electrically insulating material, covers the coil connection portion, and forms a mold for molding. It is characterized in that a sealing cover capable of closely contacting the opening of the terminal insertion hole for inserting the provided coil terminal is attached.

[0006]

When the solenoid assembly is installed in the mold for molding, the opening of the terminal insertion hole for inserting the coil terminal provided in the mold covers the coil connection portion and is sealed to the coil terminal. Since it comes into contact with the cover and does not directly come into contact with the coil terminal or the coil connection portion, it is possible to prevent the coil terminal from being damaged by the die and the coil from being disconnected at the coil connection portion. Further, since the terminal insertion holes are sealed with the sealing cover, the insulating sealing material does not leak to the outside during molding.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention.
1 shows an electromagnetic valve including a solenoid 1 and a valve unit 2 whose flow path is opened and closed by the solenoid. The solenoid 1 has a bobbin 5 around which a coil 4 is wound, a fixed iron core 6 attached to a center hole 5a of the bobbin, a magnetic frame 8 and a magnetic plate 9 surrounding these, and a base end fitted to a bobbin flange 5b. A solenoid assembly 3 having coil terminals 10, 10 whose tips project outward of the magnetic frame 8, and sealing covers 11, 11 to be fitted to these coil terminals 10, 10, and a center hole of the bobbin A movable iron core 7 is slidably inserted into 5a, and the solenoid assembly 3 is molded 12 with an insulating sealing material.

The coil 4 is provided with a groove 14 formed in the flange 5b.
Is wound around the coil terminal 10 outside the flange 5b, and the wound portion 4a is fixed to the coil terminal 10 by soldering, welding, or the like, so that it is electrically connected to the coil terminal 10 (FIG. 2). reference). The above-mentioned sealing cover 1 formed of a material having electrical insulation and moderate elasticity.
Reference numeral 1 denotes a coil-wound portion 4a whose outer shape is substantially frustoconical.
Is fitted to the coil terminal 10 so as to cover the outer periphery of the coil terminal 10. The magnetic frame 8 has a radial inflow hole 8a opening toward the outer peripheral surface of the coil 4, and an axial inflow hole 8b opening toward the space around the circumferential groove 6a of the fixed iron core 6. ,
・ ・ Is formed.

The valve body 20 of the valve section 2 has a supply port P and an output port A for a pressure fluid, and a valve seat 21 formed in a flow path connecting these ports. A valve body 22 for opening and closing the attached valve seat 21
Is biased in a direction to close the valve seat 21 by a return spring 23 contracted between the movable iron core 7 and the magnetic plate 9. Reference numerals 16 and 17 in FIG.
These are a printed wiring board for supplying power to 0 and 10, and a power supply terminal.

The above-mentioned solenoid assembly 3 is set in dies 25 and 26 shown in FIG. 3 and molded. The mold 25 is provided with a pressing portion 25a which is in contact with the upper surface of the magnetic frame 8.
And a terminal insertion hole 25 into which the coil terminals 10 and 10 are inserted.
b, 25b, and the mold 26 includes a pressing portion 26a abutting on the end face of the fixed iron core 6 on the movable iron core side, and a magnetic plate 9
And a contact portion 26b contacting the lower surface of the pressing portion 25.
The distance between a and 26 a is slightly shorter than the sum of the axial length of the fixed core 6 and the thickness of the magnetic frame 8.

In the solenoid assembly 3, the center hole 5a of the bobbin 5 is inserted into the pressing portion 26a of the mold 26, and the magnetic plate 9 is brought into contact with the contact portion 26b.
6 and the molds 25 and 26 are closed, the pressing portion 25a
And 26a bring fixed iron core 6 and magnetic frame 8 into close contact with each other, and the opening edges of terminal insertion holes 25b, 25b are pressed against the outer peripheral surfaces of sealing covers 11, 11 (see FIG. 3). Therefore, since the mold 25 does not directly contact the coil terminal 10 or the coil winding portion 4a, the coil terminal
0 and breakage of the coil in the coil winding portion 4a can be prevented. Since the terminal insertion holes 25b, 25b are sealed by the sealing cover 11, the insulating sealing material does not leak from the terminal insertion holes 25b, 25b. The insulating sealing material injected into the molds 25 and 26 passes from the periphery of the solenoid assembly 3 through the inflow holes 8a,. It flows around the circumferential groove 6a of the iron core 6.

[0012]

[Effects of the Invention] In the solenoid of the present invention, when the insulating sealing material is molded by the mold, the opening of the terminal insertion hole provided in the mold closely contacts the sealing cover fitted to the outer periphery of the coil terminal. Since it does not directly contact the coil terminal, damage to the coil terminal due to the mold and disconnection of the coil at the coil connection portion can be prevented, so that the yield of the solenoid can be increased. Further, the sealing cover can prevent the insulating sealing material from leaking from the terminal insertion hole during molding.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of an embodiment.

FIG. 2 is an explanatory diagram of a mounting mode of a sealing cover.

FIG. 3 is a longitudinal sectional view in which a solenoid assembly is inserted into a mold.

[Explanation of symbols]

 Reference Signs List 1 solenoid 3 solenoid assembly 4 coil 5 bobbin 5a center hole 6 fixed iron core 7 movable iron core 8 magnetic frame 9 magnetic plate 10 coil terminal 11 sealing cover 12 mold 25, 26 mold 25b terminal insertion hole

Continuing on the front page (72) Inventor Keisuke Shimauchi 4-2-2 Kinudai, Taniwara-mura, Tsukuba-gun, Ibaraki Pref. 60-72311 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A bobbin on which a coil is wound, a fixed core mounted in a center hole of the bobbin, a magnetic frame and a magnetic plate surrounding these, and a pair of coils mounted on the bobbin and electrically connected to ends of the coil. Having a coil terminal of, a solenoid assembly molded with an insulating sealing material,
A solenoid having a movable iron core slidably inserted into a center hole of the bobbin, wherein the coil terminal is formed of an electrically insulating material, covers the coil connection portion, and forms a mold for molding. A solenoid, wherein a sealing cover capable of closely contacting an opening of a terminal insertion hole for inserting a provided coil terminal is attached.