JPH09106911A - Resin sealed coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely separate at a prescribed distance or more the electric wire, which forms a winding part, and a lead wire, and to prevent the lead wire etc., to deviate from the appropriate position. SOLUTION: The outer circumference of a winding part 15 is mold-sealed in such a manner that the connection parts P and Q of both ends 15a of the wire, which forms a winding part 15, and a pair of lead wires 21 are covered. Before the above-mentioned sealing, a lead wire holder 30, having a groove-like holding parts 31, where the tip parts of a pair of lead wires 21 are inserted and retained, is arranged on the outer circumference of the winding part 15. By the above-mentioned lead wire holder 30, the connection parts P and Q between both ends 15a of the winding part and a pair of lead wires 21 can be forcedly separated by an appropriate distance with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin-sealed coil obtained by sealing the outer circumference of a winding part wound around a bobbin with a resin mold, and particularly to both ends of an electric wire forming the winding part. The present invention also relates to one in which the connecting portion between the end portion and the pair of lead wires is also molded with resin.

[0002]

2. Description of the Related Art Conventionally used coils (solenoids) usually include a bobbin and a winding portion formed of an electric wire wound around the bobbin, and the winding portion is formed to energize and energize the bobbin. A pair of lead wires are connected to both ends (starting end and terminating end) of the electric wire, and the lead wires are drawn out to the outside.

In such a coil, in order to improve safety, durability, etc., the entire outer periphery of the winding portion is molded and sealed with resin, and the winding portion and the electric wire forming the winding portion are thereby formed. It has been conventionally practiced to isolate the connection between the lead wire and the lead wire from the outside. When molding the outer circumference of the winding part with resin, usually, the wire is wound around the bobbin to form the winding part, and a pair of lead wires is connected to both ends of the wire forming the winding part. The molded product is placed in a mold, and a method of injecting and filling a mold resin into the mold or a method of injection molding is performed, and the resin is waited until the resin is cured and then taken out of the mold.

[0004]

In the conventional resin-sealed coil in which the outer circumference of the winding portion is molded with the resin as described above, the winding is caused by the flow at the time of injecting and filling the resin. Undesirable behavior occurs at both ends of the electric wire forming the part, the tip ends of the pair of lead wires, or the connection parts thereof, and they approach each other beyond a required insulation distance and interfere with each other. Or lead wire position (draw-out position), etc. may be displaced from the proper position, which may cause not only a decrease in yield but also a decrease in product quality and reliability. Was there.

The present invention has been made in view of the above problems, and an object of the present invention is to reliably separate electric wires and lead wires forming a winding portion by a required distance or more. It is possible to prevent the lead wires, etc. from shifting from the proper position, thus improving yield, quality,
It is intended to provide a resin-sealed coil that can improve reliability and the like.

[0006]

In order to achieve the above-mentioned object, a resin-sealed coil according to the present invention basically comprises a bobbin, a winding portion formed of an electric wire wound around the bobbin, and this winding. A pair of lead wires to which both ends of the electric wire forming the wire portion are respectively connected, and the outer circumference of the winding portion is made of resin so as to cover the connecting portion between the both ends of the electric wire and the pair of lead wires. It is molded and sealed.

A lead wire holder is arranged on the outer circumference of the winding portion, and the lead wire holder has groove-shaped holding portions on both sides thereof into which the tip portions of the pair of lead wires are fitted and held. The groove-shaped holding portion forcibly separates the connecting portions between the both ends of the electric wire and the tip portions of the pair of lead wires from each other by an appropriate distance.

A preferred embodiment of the resin-sealed coil of the present invention is one in which the groove-shaped holding portion is formed in an L-shape and the lead wire is pulled out in the radial direction. In the resin-sealed coil according to the present invention having such a configuration, both end portions (starting end portion, terminating end portion) of the electric wire forming the winding portion are previously formed before molding the outer periphery of the winding portion with resin. The connecting portions of the lead wire and the pair of lead wires were held substantially immovably by the groove-like holding portions formed on both sides of the lead wire holder, and at the same time, were forcibly separated from each other by an appropriate distance. Arranged in a state. Along with this, both ends of the electric wire and the pair of lead wires are also held in a state of being separated from each other by an appropriate distance by the lead wire holder.

Therefore, even when the resin is injected and filled,
Both ends of the electric wire forming the winding portion, the tips of the pair of lead wires, and the connecting portions thereof do not move, and therefore, they may approach each other over a required insulation distance and interfere with each other, Problems such as deviation of the lead wire position (drawing position) from the proper position are less likely to occur, and yield,
Product quality and reliability are improved.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a resin-sealed coil according to the present invention, and FIG. 2 is a view showing a resin-sealed coil 10 shown in FIG. FIG. 3 is a front view showing a state (10 ′) of the coil semi-finished product, and FIG. 3 is a sectional view showing a state where the resin-sealed coil 10 of FIG. 1 is used as a valve body driving coil of the solenoid valve 1, for example.

As shown in FIGS. 2 and 3, the resin-sealed coil 10 of the illustrated example has a bobbin 12 having a through hole 13 into which a movable iron core, which will be described later, is inserted, as well as a bobbin 12 at the center thereof. A winding portion 15 formed of a wound electric wire,
It has. The bobbin 12 has a collar-shaped portion 12 at the top and bottom.
The collar-shaped portions 12A and 12B have a semicircular shape on one side (left side in FIG. 1) and a substantially trapezoidal shape on the other side for positioning the lead wire holder 30 to be described later at the end portion on the trapezoidal side. The fitting convex portions 12a and 12b are provided.

The bobbin 1 on the outer peripheral side of the winding portion 15
A lead wire holder 30 as shown in FIG. 4 is arranged at a position sandwiched by the two fitting protrusions 12a and 12b.
The lead wire holder 30 is made of synthetic resin.
5, a rear plate portion 34 having a curved surface extending along the outer peripheral surface of the rear end portion 34, which is brought into contact with the winding portion 15, an L-shaped central partition column portion 33 projecting from the central portion of the rear plate portion 34, and the rear plate. A lateral plate portion 35 projecting laterally below the L-shaped partition column portion 33 at the lower end of the portion 34, and provided on the upper side of the L-shaped partition column portion 33.
The L-shaped front plate portion 36 is shorter than the L-shaped partition column portion 33 and has the same width as that of the lateral plate portion 35. The L-shaped partition column portion 33 is provided at the upper end portion thereof and is fitted with the bobbin 12 in a convex shape. The upper fitting portion 37 is fitted into the portion 12a, and the lower fitting portion 38 is projectingly provided at the center of the lower surface of the lateral plate portion 35 and fitted into the fitting convex portion 12b of the bobbin 12.

Here, the rear plate portion 34, the horizontal plate portion 35, and the L-shaped front plate portion 36 are provided on both sides of the L-shaped central partition column portion 33.
A pair of left and right L-shaped groove-shaped holding portions 31 and 32 are formed so as to be sandwiched between and. Then, as shown by phantom lines in FIG. 4, not only the tip portions of the pair of lead wires 21 and 22 (not only the core wire portions 21A and 22A where the coating portions 21B and 22B are cut away and exposed) but also the coating of the rear side thereof are covered. (Including some of the portions) are fitted in groove-shaped holding portions 31 and 32 formed on both the left and right sides of the lead wire holder 30.

In this case, the coating portions 21B and 22B made of vinyl or the like for the lead wires 21 and 22 are the groove-shaped holding portions 3.
It is pressed into 1, 32 and held by its elasticity. In this case, the lead wires 21 and 22 are pulled out in the radial direction (lateral direction) because the groove-shaped holding portions 31 and 32 are formed in an L shape. The pair of lead wires 2
Before and after the tips of the lead wires 1, 22 are fitted into the groove-shaped holding portions 31, 32, as shown in FIG. 2 and FIG. 3, the tips of the pair of lead wires 21, 22 are exposed. Both ends 15a and 15b of the electric wire forming the winding portion 15 are separately wound around the core wire portions 21A and 22A and entwined with each other, and the starting end portion 15a of the electric wire forming the winding portion 15 and one lead wire 21 (the tip of the core wire 21A), and the terminal end portion 15b of the electric wire and the other lead wire 22 (the tip of the core wire 22A) are connected.

In this case, the connecting portions P and Q (FIG. 2) between the end portions 15a and 15b of the electric wire forming the winding portion 15 and the pair of lead wires 21 and 22 (FIG. 2) may be soldered or the like if necessary. Reinforcing so as not to loosen, and thereafter, groove-shaped holding portions 31, 32 formed on both sides of the lead wire holder 30.
Of the electric wire and the pair of lead wires 2 and 15a, 15b, which are held at a position above the upper part of the wire, are held in a state of being forcibly separated from each other by an appropriate distance.
The lead wire holder 30 also holds the lead wires 1 and 22 separated from each other by an appropriate distance.

In this state, the lead wire holder 30 is fixed to the winding portion 15 (or the bobbin 12) by an appropriate means such as an adhesive tape 18 made of polyester, as shown in FIG. In this case, the adhesive tape 18 is wound around the winding portion 15 so as to pass through the L-shaped partition column portion 33 and the connecting portions P and Q. The coil semi-finished product 10 'in this state (the portion consisting of the bobbin 12, the winding portion 15, the lead wire holder 30, and the lead wires 21 and 22 shown in FIG. 2) is arranged in the mold, and the mold resin is injected and filled therein. Then, molding is performed.

As a result, as shown in FIG. 4, the connecting portions P and Q between the both ends 15a and 15b of the electric wire forming the winding portion 15 and the pair of lead wires 21 and 22 are covered. The entire outer periphery of the winding portion 15 is molded with resin (resin mold 20) and sealed, and the resin-sealed coil 10 as a product is obtained. The resin-sealed coil 10 thus produced is used as a valve body driving coil for the solenoid valve 1 as shown in FIG. 3, and in this case, the blind lid 43 and the sleeve 45 are inserted into the through hole 13. At the same time, a U-shaped holding member 25 is mounted on the outer periphery of the blind lid 43 and the holding member 25 is fastened with a set screw 44,
A movable iron core 40 biased downward by a coil spring 46 is slidably inserted into the sleeve 45.
A conical valve body 42 is provided at the lower end of the movable iron core 40 so as to project therefrom.

The resin-sealed coil 10 is seated and fixed to the seat 53 of the valve box 50 through the waterproof packing 54, and the coil 10 is energized and excited through the lead wires 21 and 22 to move the movable iron core. 40 is slid vertically, and a valve seat 51 disposed in the seat 53 is provided.
On the other hand, the valve element 42 protruding from the movable iron core 40 is brought into contact with and separated from the movable iron core 40, whereby the flow rate is adjusted.

In one embodiment of the resin-sealed coil according to the present invention having such a structure, both ends of the electric wire forming the winding portion 15 are previously formed before the outer periphery of the winding portion 15 is molded with resin. The connecting portions P and Q between the portions 15a (starting end portions) and 15b (terminating end portions) and the pair of lead wires 21 and 22 are groove-shaped holding portions 31 formed on both sides of the lead wire holder 30, respectively.
They are held substantially immobile in 32 and at the same time are forced apart from one another by a suitable distance. Along with this, both ends 15a and 15b of the electric wire and the pair of lead wires 21 and 22 are also connected to the lead wire holder 30.
To be separated by an appropriate distance.

Therefore, even when the resin is injected and filled,
Both ends 15a, 15b of the electric wire forming the winding portion 15, the tips of the pair of lead wires 21, 22 and their connecting portions P, Q hardly move, so that they are separated from each other by a required insulation distance. Problems such as lead wires approaching each other and interfering with each other and the position of lead wires (drawing position), etc. deviating from the proper position are less likely to occur, and yield, product quality,
Reliability etc. improves.

The shape of the lead wire holder 30 is not limited to that of the above-mentioned example, and it is needless to say that it can be appropriately changed. In short, both ends of an electric wire forming a winding portion and a pair of lead wires are required. Any structure may be used as long as it can separate the connection portion with the front end of the resin by an appropriate distance and at the same time can hold it in an immovable state against the flow of the resin.

[0022]

As can be understood from the above description, the resin-sealed coil of the present invention has a structure in which both ends of an electric wire forming a winding portion are formed in advance before molding the outer periphery of the winding portion with resin. A state in which the connecting portions with a pair of lead wires are held substantially immovably in groove-shaped holding portions formed on both sides of the lead wire holder, and at the same time, are forcibly separated from each other by an appropriate distance. Therefore, both ends of the electric wire forming the winding portion, the tip portions of the pair of lead wires, and the connecting portions thereof hardly move even when the resin is injected and filled.
Therefore, they approach each other beyond the required insulation distance and interfere with each other, or the position of lead wires (drawing position)
It is less likely that a defect such as deviation from the proper position will occur, and the yield, product quality, reliability, etc. are improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a resin-sealed coil according to the present invention.

FIG. 2 is a front view showing a state of a coil semi-finished product before resin is molded on an outer periphery of a winding portion in the resin-sealed coil shown in FIG.

FIG. 3 is a cross-sectional view showing a state where the resin-sealed coil shown in FIG. 1 is used as a valve body driving coil of an electromagnetic valve.

4 is a perspective view showing a lead wire holder used for the resin-sealed coil shown in FIG. 1. FIG.

[Explanation of symbols]

 10 Resin Sealing Coil 12 Bobbin 15 Winding Part 18 Adhesive Tape 20 Resin Mold 21, 22 Lead Wire 30 Lead Wire Holder 31, 32 Groove-shaped Holding Part P, Q Connection Part

Claims (3)

[Claims] 1. A bobbin, a winding part formed of an electric wire wound around the bobbin, and a pair of lead wires to which both ends of the electric wire forming the winding part are connected, respectively. In the resin-sealed coil in which the outer circumference of the winding part is molded with resin so as to cover the connection part between the lead wire and the pair of lead wires, a lead wire holder is arranged on the outer circumference of the winding part. Characteristic resin-sealed coil. 2. The lead wire holder has groove-shaped holding portions on both sides of which the distal end portions of the pair of lead wires are fitted and held, and the groove-shaped holding portions and both end portions of the electric wire and the electric wire holder. 2. The resin-encapsulated coil according to claim 1, wherein the connecting portions between the tip portions of the pair of lead wires are forcibly separated from each other by an appropriate distance. 3. The resin-sealed coil according to claim 2, wherein the groove-shaped holding portion is formed in an L-shape, and the lead wire is pulled out in a radial direction.