JPH11176633A - Harness lead part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a harness lead part structure which can improve insulating property of a molded coil without causing increase of its size and substantial increase of its costs. SOLUTION: A lead part 26 of a molded coil 15 includes a molding resin 25 for molding the coil 15, a resin bush 31 loosely fitted to a harness 24, and an O ring 32 disposed between the bush 31 and harness 24 as closely contacted with an outer peripheral surface of the harness 24 and with an inner peripheral surface of the bush 31. The bush 31 has a cylindrical part 33 and a stopped part 34 projected in the inward direction from a left end of the cylindrical part 33 to prevent sideway slip-out of the O ring. A projection 35 thinner than the cylindrical part 33 is provided as projected in the form of a ring from a right end of the cylindrical part 33. In molding, the right end of the resin bush 31 surrounding the harness 24 is melted to be integral with the resin 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead-out structure of a molded coil harness for generating a magnetic force in, for example, an electromagnetic valve.

[0002]

2. Description of the Related Art Conventionally, a solenoid valve is provided with a molded coil for generating a magnetic force.

[0003] The molded coil includes a bobbin, a coil wound around the bobbin, and a harness connected to the coil, and the harness and the coil are molded by molding resin. Thereby, as shown in FIG. 4, the harness 101 connected to the coil
Is configured such that its outer peripheral portion is covered with a mold resin 102 to prevent water from entering the coil and to ensure insulation from the outside.

[0004]

However, since the harness 101 is constructed so as not to be melted by heat during molding, the adhesion between the harness 101 and the molding resin 102 is poor, and the harness 101 is hardly melted.
In some cases, a gap may be formed in the outer peripheral portion of No. 01.

[0005] Further, as shown in FIG.
01 is externally fitted with a rubber grommet 103 and molded with a molding resin 102 to
It is conceivable to ensure the sealing performance at the outer peripheral portion of the harness 101, but in this case, the adhesion between the rubber grommet 103 and the mold resin 102 is poor, and a gap is formed in the outer peripheral portion of the grommet 103. Sometimes.

[0006] In the draw-out portion of the harness 101 in both cases, water or the like may enter through the gap, and there is a possibility that the insulating property is reduced.

On the other hand, as shown in FIG.
A recess 105 is formed in advance in a drawn-out portion of the mold resin 102 from which the
A method of forming an adhesive portion 106 between the harness 101 and the mold resin 102 by filling an adhesive with the adhesive and curing the adhesive is considered. In this case, the adhesion between the harness 101 and the mold resin 102 immediately after the adhesive is cured can be increased, but the degree of exposure of the bonding portion 106 to the outside is large, and the bonding portion 106 is affected by the external environment. Cheap. Therefore, it is difficult to select the temperature characteristics and the like of the adhesive. In addition, a process of filling the adhesive and a process of curing are added, and a curing time is required, which causes an increase in cost.

Therefore, as shown in FIG. 7, after the molded coil is housed in the casing 112 of the electromagnetic valve 111, the upper end of the casing 112 including the part from which the harness 101 is drawn out is covered with a rubber boot 113. In this case, the solenoid valve 1
This leads to an increase in size and a significant increase in cost.

The present invention has been made in view of such conventional problems, and has a drawer portion structure of a harness capable of improving the insulation of a molded coil without increasing the size and the cost. The purpose is to provide.

[0010]

According to a first aspect of the present invention, there is provided a harness lead-out portion structure for pulling out a harness of a molded coil in which a harness to be drawn out is molded with a molding resin. In the partial structure, a seal member is provided between the harness and a loose fitting member that loosely fits into the harness, and the seal member is attached to an outer peripheral surface of the harness and an inner peripheral surface of the loose fitting member. At the same time, when the harness was molded with the mold resin, a portion of the loose fitting member surrounding the harness was melted and integrated with the mold resin.

That is, a seal member is provided between the harness and the loose fitting member that loosely fits into the harness, and the seal member is in close contact with the outer peripheral surface of the harness and the inner peripheral surface of the loose fitting member. The sealing performance between one side and the other side of the harness as a boundary is ensured. Then, in the loose fitting member surrounding the seal member, the portion surrounding the harness is melted when the harness is molded and integrated with the mold resin, so that the mold resin and the harness are combined. There is no gap between the surrounding loose fitting member.

In the harness drawer structure according to a second aspect of the present invention, the loose fitting member is formed by projecting the cylindrical member in which the seal member is internally fitted and an inner side from one end of the cylindrical member. A stopper portion for preventing the sealing member from coming off in the direction in which the harness is pulled out, and a projection thinner than the cylindrical portion is provided at the other end of the cylindrical portion that is melted when being molded. The portion was formed in a ring shape along the circumferential direction of the cylindrical portion.

[0013] Thus, the stopper portion prevents the seal member provided between the harness and the loose fitting member that is loosely fitted in the harness from being inadvertently pulled out of the harness in the pull-out direction. The harness that passes through the cylindrical portion is surrounded by a protrusion formed at an end of the cylindrical portion, and the protrusion is set to be thinner than the cylindrical member. For this reason, the projection has a smaller volume than the cylindrical portion, and is reliably melted during molding.

Further, in the harness draw-out portion structure of the third aspect, the loose fitting member is formed of the same material as the molding resin.

Thus, the degree of coupling between the loose fitting member and the mold resin after melting is increased,
As compared with the case where the loose fitting member and the mold resin are formed of different materials, the procurement cost of the material is suppressed.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a solenoid valve 1 having a harness draw-out portion structure according to the present embodiment. The solenoid valve 1 is provided, for example, in a hydraulic circuit for assisting the operation of a brake, This controls the flow of oil.

The solenoid valve 1 includes an inflow path 11 and an outflow path 1.
An electromagnetic valve body 14 having a nozzle portion 13 having a protrusion 2 formed at a lower end thereof; a molded coil 15 housed in the electromagnetic valve body 14; a core 16 fitted in an end of the molded coil 15; And a plunger 17 housed inside the molded coil 15. When the molded coil 15 is energized and the core 16 is excited, the plunger 17 is attracted to the core 16, 17 is formed at the lower end of the inflow passage 1.
The seat 1 is configured so as to be seated from a valve seat 19 formed at the upper end thereof to shut off the inflow path 11 and the outflow path 12.

As shown in FIG. 2, the molded coil 15 includes a bobbin 21 and a coil 2 wound around the bobbin 21.
2, a harness 24 connected to the coil 22 and extending laterally from an upper surface 23 of the bobbin 21;
An outer peripheral portion of the bobbin 21, the coil 22, and a molding resin 25 for molding the harness 24 are provided. At an upper end portion of the molded coil 15, a drawer 26 from which the harness 24 is pulled out is directed sideways. It is protruding.

As shown in FIG. 3, the drawer 26 has a resin bush 31 serving as a loose fitting member which is loosely fitted to the harness 24 and integrated with the mold resin 25, as shown in FIG. The resin bush 31
And between the harness 24 and the harness 2.
4 and an O-ring 32 as a sealing member closely contacted with the inner peripheral surface of the resin bush 31. The resin bush 31 is provided with the mold resin 2.
5. The resin bush 31 is formed of a resin of the same material as that of the fifth embodiment, and the resin bush 31 projects inward from the left end of the cylindrical portion 33 in which the O-ring 32 is fitted. And the stopper portion 34 formed. Thereby, the O-ring 32 fitted inside the cylindrical portion 33 is prevented from being accidentally pulled out to the side by the stopper portion 34. Further, the cylindrical portion 3
At the right end of 3, a projection 35 extending along the cylindrical portion 33 and having a smaller thickness than the cylindrical portion 33 is provided in a ring shape along the cylindrical portion 33.

When the mold coil 15 is molded, an O-ring 32 is externally fitted to the base end of the harness 24 pulled out from the bobbin 21.
The resin bush 31 is externally fitted to the harness 24 from the cylindrical portion 33 side. And the resin bush 3
1 is moved along the harness 24 toward the bobbin 21 to fit the O-ring 32 inside the tubular portion 33, and while maintaining this state, molding is performed with the molten mold resin 25. I do. This allows
The resin bush 31 is melted at a right end portion surrounding the harness 24 and integrated with the mold resin 25.
And a connection portion between the harness 24 and the mold resin 25.

In the present embodiment having the above configuration, the harness 24 drawn out of the molded coil 15
An O-ring 32 that is in close contact with the outer peripheral surface of the harness 24 and the inner peripheral surface of the resin bush 31 is provided between the cylindrical portion 33 of the resin bush 31 that fits loosely into the harness 24. The sealing property between the left side and the right side of the cylindrical portion 33 with the O-ring 32 as a boundary is ensured. The resin bush 31 surrounding the O-ring 32 is melted when the right end surrounding the harness 24 is molded and is integrated with the mold resin 25.
There is no gap between the mold resin 25 and the resin bush 31 surrounding the harness 24.

Therefore, the mold resin 25 and the harness 24 or the mold resin 25 are formed by directly molding the harness 24 that is not melted by heat, or by molding the harness 24 with a rubber grommet. A gap is formed between the wire harness 24 and the grommet, and water may enter through these gaps, and the draw-out portion 26 of the conventional harness 24 may have reduced insulation.
As compared with the structure, it is possible to reliably ensure insulation. In addition, a concave portion is formed in the drawer portion 26 of the harness 24, and the concave portion is filled with an adhesive and cured to form an adhesive portion between the harness 24 and the mold resin 25. There is no need to select a temperature characteristic or the like. In addition, the process of filling the adhesive,
Since the curing step is not required, the waterproofness can be improved without increasing the cost. In addition, harness 2
As compared with the case where the drawer 26 of the fourth valve 4 is covered with a rubber boot or the like, it is possible to avoid an increase in size of the solenoid valve 1 and a significant increase in cost.

The cylindrical portion 33 of the resin bush 31
Is formed with a stopper portion 34 protruding inward. The stopper portion 34 prevents the O-ring 32 fitted inside the cylindrical portion 33 from being accidentally pulled out to the side. It is configured as follows. For this reason, the resin bush 31 is externally fitted to the harness 24 and is moved along the harness 24 toward the bobbin 21 so that the O-ring 32 externally fitted to the harness 24 is
It is possible to securely fit the inside of the tubular portion 33 while preventing the resin bush 31 from accidentally coming off.

The protrusion 35 formed on the resin bush 31 is formed at the right end of the cylindrical portion 33, and more effectively removes heat from the molten mold resin 25 during molding. It is configured so that it is arranged inside which is easy to receive. The projection 35 is formed in a ring shape along the cylindrical portion 33, and the cylindrical portion 3
The harness 24 through which the wire 3 is inserted is surrounded by the protrusion 35. Further, the protrusion 35 is formed so as to be thinner than the cylindrical portion 33, and is set so as to have a smaller volume than the cylindrical portion 33. Can be melted. Therefore, a fusion-bonded portion in which the resin bush 31 and the mold resin 25 are fusion-bonded can be reliably formed on the outer peripheral portion surrounding the harness 24.

In addition, the protrusion 35 is provided on the cylindrical portion 3.
3 is formed on the right end of the cylindrical portion 3
3, the mold resin 25 can be brought into close contact with the resin bush 31 without obstructing the flow of the melted mold resin 25. Therefore, the sealing performance of the harness 24 can be further improved.

In particular, in the present embodiment, since the resin bush 31 is formed of a resin of the same material as the mold resin 25, the degree of coupling between the resin bush 31 and the mold resin 25 after melting is increased. And the procurement cost of the material can be reduced as compared with the case where the resin bush 31 and the mold resin 25 are formed of different materials.

[0027]

As described above, according to the harness drawer structure of the first aspect of the present invention, the loose fit in which the sealing performance between the one side and the other side of the harness with the seal member as a boundary is ensured. The member is melted when molding the harness and is integrated with the mold resin, so that a gap between the mold resin and the loose fitting member surrounding the harness is formed. Will not occur. Therefore, a gap is formed between the molding resin and the harness, or between the molding resin and the grommet, by directly molding the harness that does not melt in heat or molding the harness with the rubber grommet fitted outside. As a result, it is possible to reliably ensure the insulation as compared with the conventional harness draw-out portion structure in which water may enter through these gaps and the insulation may decrease.

Further, a concave portion is formed in the harness lead-out portion, and the concave portion is filled with an adhesive and cured to form an adhesive portion between the harness and the mold resin. Effort is not required when selecting such items. Further, since a step of filling the adhesive and a step of curing are not required, the waterproof property can be improved without increasing the cost. In addition, it is possible to avoid an increase in size and a significant increase in cost as compared with a case where the cover is covered with a rubber boot or the like.

According to the second aspect of the present invention, the sealing member disposed between the harness and the loose fitting member that loosely fits into the harness is inadvertently pulled out in the direction in which the harness is pulled out. Can be prevented by the stopper portion. And, while surrounding the harness, a projection formed thinner than the cylindrical member,
Since the volume is set smaller than that of the cylindrical portion, it can be reliably melted during molding. Thereby, the fusion bonding portion between the loose fitting member and the mold resin can be reliably formed at the outer peripheral portion surrounding the harness, and the sealing performance of the harness can be further enhanced.

Further, in the harness drawer portion structure according to claim 3, the loose fitting member is formed of the same material as the mold resin, so that the loose fitting member and the mold resin after melting are formed. The degree of coupling can be increased, and the procurement cost of the material can be suppressed as compared with the case where the loose fitting member and the mold resin are formed of different materials.

[0031]

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing the molded coil of the embodiment.

FIG. 3 is an enlarged view showing a portion A in FIG. 2;

FIG. 4 is a cross-sectional view of a harness extension portion showing a first conventional example.

FIG. 5 is a cross-sectional view of a harness extension portion showing a second conventional example.

FIG. 6 is a cross-sectional view of a harness extension portion showing a third conventional example.

FIG. 7 is a side view of a harness drawer showing a fourth conventional example.

[Explanation of symbols]

 15 Mold coil 24 Harness 25 Mold resin 26 Pull-out part 31 Resin bush (external fitting member) 32 O-ring (seal member) 33 Cylindrical part 34 Stopper part 35 Projection part

Claims (3)

[Claims] In a drawer structure of a harness of a molded coil in which a harness to be drawn out is molded with a molding resin, a seal member is provided between the harness and a loosely fitting member that fits loosely into the harness. The seal member is brought into close contact with an outer peripheral surface of the harness and an inner peripheral surface of the loose fitting member, and a part of the loose fitting member surrounding the harness when molding the harness with the mold resin. A harness withdrawal portion structure, wherein the harness is integrated with the mold resin. 2. The loose fitting member comprises: a cylindrical tubular portion in which the seal member is fitted; and an inner end protruding from one end of the tubular portion, and the seal member is moved in a direction in which the harness is pulled out. A stopper portion for preventing detachment, and a thinner projection than the cylindrical portion is formed along the circumferential direction of the cylindrical portion at the other end of the cylindrical portion that is melted when being molded. 2. The harness lead-out part structure according to claim 1, wherein the harness is formed so as to project in a ring shape. 3. The harness lead-out structure according to claim 1, wherein the loose fitting member is formed of the same material as the mold resin.