JPH09254184A - Resin mold structure having elastic member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a resin mold structure having an elastic member capable of reducing the damage of parts at a time of molding. SOLUTION: A mold 1 for molding a main body case of an electromagnet is constituted of a lower mold 2 to which a coil member 11 is fitted, the placing piece 4 arranged to the side part of the lower mold and an upper mold 3. An elastic rubber bushing 15 is arranged to a part of the recessed surface 4a formed to the placing piece 4 on the side of the lower mold 2 so as to protrude outward. The rubber bushing 15 has a through-hole formed to its head part 16 and body part 17 and the lead wire 19 connected from the coil member 11 is inserted into the through-hole. A first jaw part 16a, a taper surface and a second jaw part are formed to the end surface on the side of the body part 17 of the head part 16 and the first jaw part 16a is brought into contact with the inner peripheral wall of the recessed surface 4a of the placing piece 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molding structure having an elastic member, and mainly to a structure for molding a main body case of an electromagnet with resin.

[0002]

2. Description of the Related Art Conventionally, a main body case 21 of an electromagnet is shown in FIG.
As shown in FIG. 5, a yoke 13 made of a magnetic material that constitutes an outer peripheral circuit body is arranged on the outer circumference of the coil body 11, and a resin material is formed on the outer circumference of the yoke 13. Furthermore, the coil body 11
A rubber bushing 22 is arranged on a part of the outer periphery of the main body case 21 so as to protect the lead wire 19 connected to the main body case 21. The coil body 11, the yoke 13, and the rubber bushing 22 are integrally molded with a resin material. Are configured. The rubber bushing 22 formed on a part of the outer periphery of the protrusion 21a of the main body case 21 has a large-diameter head 23 and a small-diameter body 24, as shown in FIG. A through hole 25 through which the lead wire 19 penetrates is provided inside. The head 23 is embedded in the main body case 21, and the head 23
The resin material is disposed between the main body case 21 and the outer peripheral edge of the main body case 21, and the body portion 24 is integrally molded with the main body case 21 so as to project outward from the main body case 21.

This state will be described with reference to a die in the manufacturing process. As shown in FIG. 7, the die 1 for molding the main body case 21 has a base portion 2a formed in a cylindrical shape at the bottom.
And a lower die 2 having an eccentric position from the central portion and having a small-diameter columnar support portion 2b protruding upward from the base portion 2a, and the coil body 11 is fitted to the support portion 2b of the lower die 2. The upper die 3 is disposed so as to cover the coil body 11 from above, and the placing piece 4 for covering the rubber bushing 22 disposed on the protrusion 21a of the main body case 21 is provided. . The fine knitting part (the part in the figure) in the figure is the part into which the resin material flows, and from the injection gate 7 formed in one place (the right side surface part in the figure) between the upper mold 3 and the lower mold 2. The main body case 21 is formed by injecting the resin material into the space 5 formed in the main body case 21 between the upper die 3, the lower die 2 and the placing piece 4.

The rubber bushing 22 is a rubber bushing 2.
The resin material is arranged so as to flow between the head portion 23 of the second member 2 and the end surface of the placement piece 4.

[0005]

However, in the conventional resin molding structure having the elastic member, the rubber bushing 22 is arranged so that the resin material flows between the head 23 of the rubber bushing 22 and the placing piece 4. Therefore, when the resin material is injected from the injection gate 7, the resin material to which the pressure P is applied as shown in FIG. 6 is placed on the side surface of the body portion 24 of the rubber bushing 22 and the body portion 24. It will flow in from the gap between the hole 4b of 4 and the hole 4b. Therefore, the tip of the rubber bushing 22 formed of an elastic body (left side in the figure)
Is pressed from the outer periphery toward the through hole 25, and the through hole 2
The lead wire 19 of the coil 12 inserted through the wire 5 is pressed. When the pressure applied to the resin material is large, the lead wire 19 originally protected by the rubber bushing 22 may damage the coating,
Many of them are broken and cannot be used.

The present invention is intended to solve the above-mentioned problems, and an object of the present invention is to provide a resin molding structure having an elastic member for extremely reducing damage to parts during molding.

[0007]

In the resin molding structure having an elastic member according to the present invention, in order to solve the above problems, an elastic member is provided on a part of the outer periphery of a case body whose outer periphery is formed of a resin material. A resin molding structure having an elastic member that is embedded and molded so as to project outward, wherein the elastic member has an inflow prevention unit that prevents the inflow of the resin material in the outward projecting direction of the elastic member. It is characterized by having.

Further, the inflow preventing means formed on the elastic member has a jaw portion formed so as to abut against an inner wall of the mold into which the resin material is introduced. Is desirable.

Further, the elastic member is formed to have a flange-shaped head portion, a cylindrical body portion, and a through hole that passes through a shaft core inside, and the head portion serves as the inflow means. First of
It suffices that a jaw portion and a second jaw portion that prevents the elastic member from coming off the case body are formed.

Further, according to the present invention, a resin molding having an elastic member formed by embedding an elastic member in a part of the outer periphery of a main body case of an electromagnet whose outer periphery is formed of a resin material so as to project outward. A structure, in which a coil body including a coil is disposed in a mold having a lower mold and an upper mold, and a head having a large diameter and a small diameter are arranged so as to be directed outward from a part of an inner peripheral wall of the mold. An elastic member having a body portion of is disposed, and a head portion of the elastic member, a jaw portion that abuts the inner peripheral wall of the mold,
Retaining means for preventing the elastic member from coming off the main body case, a lead wire connected to the coil is inserted through the elastic member, and the jaw portion is the inner peripheral wall of the mold. Abutting against the resin material is configured to prevent the resin material from flowing out of the elastic member when the resin material flows into the mold. It may be.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In the following description,
The same members as those in the related art are designated by the same reference numerals.

FIG. 1 shows a resin molding structure of an improved mold for molding the main body case 10 of the electromagnet S shown in FIG. 3. The mold 1 is provided with a coil 12 and a bobbin 14. The lower die 2 that supports the coil body 11 that it has, the upper die 3 that is arranged so as to support the yoke 13 from above the lower die 2 and cover the coil body 11, and the main body case 10 on a part of the lower die 2. And a placing piece 4 arranged to mold the outer peripheral protruding portion.

The lower die 2 has a large diameter cylindrical base portion 2a at the bottom.
Is formed, and a cylindrical support portion 2b having a small diameter is formed upward at a position eccentric to the right side in FIG. 1 from the central portion of the base portion 2a. The coil body 11 has a supporting portion 2b.
Is fitted and supported. A placing piece 4 whose lower part is fitted to the base portion 2 a of the lower die 2 is provided on a part of the lower die 2 on the left side in FIG. 1. The surface of the placing piece 4 on the side of the support portion 2b of the lower die 2 is formed and arranged as a stepped concave surface 4a that matches the shape of a part of the outer peripheral surface of the main body case 10 including the protruding portion 10a shown in FIG. Has been done. The upper mold 3 has a concave portion 3a including a supporting portion 3b having the same shape as the outer peripheral surface of the main body case 10 excluding the placing piece 4 therein, so that the lower surface is engaged with the base portion 2a of the lower mold 2. The yoke 13 is disposed and the yoke 13 is supported by the support portion 3b of the upper mold 3. A space 5 in which the main body case 10 is formed is formed between the lower mold 2, the upper mold 3, the placement piece 4, and the coil body 11.

A rubber bushing 15 is arranged in a portion of the space 5 corresponding to the protruding portion 10a of the main body case 10. The rubber bushing 15 is, as shown in FIG.
It is composed of a flange-shaped head portion 16 and a cylindrical body portion 17, and a through hole 18 is formed in the shaft core. Head 16 is space 5
And the body portion 16 is a hole portion 4 formed in the placement piece 4.
It is inserted in b. The head portion 16 is formed in two steps, and a first jaw portion 16a is formed on the body-side end surface, and a tapered surface 16b is formed which hangs from the first jaw portion 16a to the side opposite to the body portion and spreads toward the side opposite to the body portion. Has been done. The non-body portion side is formed to have a larger diameter than the body portion side, and the second jaw portion 16c is formed on the end surface on the tapered surface 16b side. Then, the first jaw portion 16a of the head portion 16 is brought into contact with the concave surface 4a of the placing piece 4 and the rubber bushing 15
The taper surface 1 serves to prevent resin from flowing out to the body portion 17 of the
The portion formed by 6b and the second jaw portion 16c serves as a retaining function of the rubber bushing 15 from the main body case 10.

A lead wire 19 is provided on the coil 12 forming the coil body 11, and the lead wire 19 passes through a portion corresponding to the projecting portion 10a of the main body case 10 and is inserted into the through hole 18 of the rubber bushing 15 to externally. Be extended to.

An injection gate 7 is formed at one place on a part of the mating surface of the lower mold 2 and the upper mold 3 (right side surface in FIG. 1), and resin is injected from the injection gate 7.

When the resin is injected into the mold 1 thus constructed, the resin flows into the space 5 formed in the mold 1. Since the resin flows into the space 5 in the mold 1 without leaving a gap, the resin is under pressure. However, the rubber bushing 15 and the concave surface 4b of the placing piece 4 are in contact with each other, and the molding resin pressure P is applied to the right end of the head of the rubber bushing 15 in the left direction. The resin does not flow from the portion 16a toward the body portion 17. Therefore, the lead wire 19 is not damaged. Further, the rubber bushing 15 does not come off from the main body case 10 due to the tapered surface 16b formed on the rubber bushing 15 and the second jaw 16c.

The shape of the head 16 formed on the rubber bushing 15 is such that the rubber bushing 15 is the main body case 10.
The shape is not limited to the above as long as it can prevent the slipping off from the inside. For example, the second jaw portion 16c may be eliminated and the tapered surface 16b may be formed so as to continue to the outer peripheral surface on the side opposite to the trunk portion. Conversely, the tapered surface 16b may be eliminated and the first jaw portion 16a may be eliminated.
Alternatively, the second jaw 16c may be formed.

The body case 10 of the electromagnet resin-molded as described above is constructed as shown in FIG.

The main body case 10 is formed in a cylindrical shape except for a protruding portion 10a which is partially formed, and a coil body 11 having a coil 12 and a bobbin 14 is built in the main body case 10. A hollow portion 20 is formed inside the bobbin 14 around which the coil 12 is wound, and a yoke 13 is formed on the outer circumference of the bobbin 14.
Are arranged. In addition, the protruding portion 10 of the main body case 10
A rubber bushing 15 is arranged at the inner end of a, and a lead wire 19 connected to the coil penetrates the rubber bushing 15 and extends to the outside. Coil body 11, yoke 1
Except for the hollow portion 20, except for 3, the rubber bushing 15, and the lead wire 19, all are filled with resin.

Then, as shown in FIG. 4, a fixed iron core 22, a pipe 23, and a magnetic blocking member arranged between the fixed iron core 22 and the pipe 23 are integrally formed in the main body case 10. When the movable iron core 25 is fitted into the pipe 23 and the magnetic blocking member 24 so that the movable iron core 24 is inserted and sucked by the fixed iron core 22, the electromagnetic proportional solenoid S is constituted by fixing the movable iron core 25 with the cap body 26. A solenoid valve is formed by attaching a hydraulic valve to the tip of a pin 25a formed in the fixed core 22 and penetrating through the fixed iron core 22.

The electromagnetic proportional solenoid S achieves stable performance because the lead wire 19 constituting the electromagnetic proportional solenoid S is protected by the rubber bushing 15 without deformation.

[0023]

As described above, according to the present invention, in the resin molding structure having the elastic member, the elastic member protrudes outward at a part of the outer circumference of the case body having the outer circumference made of the resin material. Thus, the elastic member is deformed by the pressure of the resin by having the inflow prevention means for preventing the inflow of the resin material in the outward projecting direction of the elastic member. There is nothing to do. Therefore, a stable product can be molded without damaging the member arranged on the elastic member.

Further, when the resin molding structure having this elastic member is applied to the main body case of the electromagnet, the rubber bushing of the elastic body arranged in the main body case has the first jaw portion as the resin inflow preventing means, Since the second jaw portion that prevents the rubber bushing from coming out of the main body case is formed, the inside of the rubber bushing is not deformed.
Therefore, a stable main body case of the electromagnet can be molded without damaging the lead wire or the like passing through the through hole of the rubber bushing. .

[Brief description of drawings]

FIG. 1 is a sectional view showing a resin molding structure according to an embodiment of the present invention.

FIG. 2 is a partial detailed view of FIG.

FIG. 3 is a sectional view of the main body case molded in FIG.

FIG. 4 is a form showing a usage state of a main body case in FIG.

FIG. 5 is a sectional view showing a conventional body case.

6 is a partial detailed view of FIG.

FIG. 7 is a view showing a resin molding structure of the main body case in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Mold 2 ... Lower mold 3 ... Upper mold 4 ... Placement piece 4a ... Concave surface (inner peripheral wall) 10 ... Main body case 10a ... Projection 11 ... Coil body 12 ... Coil 15 ... Rubber bushing (elastic member) 16 ... Head 16a ... 1st jaw part (outflow prevention means) 16b ... Tapered surface (prevention means) 16c ... 2nd jaw part (prevention means) 17 ... Body part 18 ... Through hole 19 ... Lead wire

Claims (4)

[Claims] 1. A resin molding structure having an elastic member formed by embedding an elastic member so as to project outward, at a part of the outer periphery of a case body having an outer periphery formed of a resin material,
A resin molding structure having an elastic member, characterized in that the elastic member has an outflow prevention means for preventing the outflow of the resin material in a protruding direction of the elastic member. 2. The outflow prevention means formed on the elastic member has a jaw portion formed so as to abut against an inner wall of the mold into which the resin material is introduced. A resin molding structure having the elastic member described. 3. The elastic member includes a flange type head,
A first body serving as the outflow prevention means is formed in the head portion, the body portion having a cylindrical shape and a through hole that passes through the shaft core inside.
The resin molding structure having an elastic member according to claim 1, wherein a jaw part and a second jaw part for preventing the elastic member from coming off the case body are formed. 4. A resin-molded structure having an elastic member formed by embedding an elastic member in a part of the outer periphery of a main body case of an electromagnet whose outer periphery is formed of a resin material so as to project outward. A coil body including a coil is arranged in a mold having a lower mold and an upper mold, and a large-diameter head part and a small-diameter body part are arranged so as to extend outward from a part of the inner peripheral wall part of the mold. An elastic member having the elastic member is disposed, and a head portion of the elastic member is provided with a jaw portion that abuts against the inner peripheral wall of the mold, and a retaining means for preventing the elastic member from coming off the main body case. ,
Is formed, a lead wire connected to the coil is inserted through the elastic member, and when the jaw portion abuts on the inner peripheral wall of the mold, when the resin material flows into the mold. A resin molding structure having an elastic member configured to prevent the resin material from flowing out of the elastic member.