JPH0747818Y2 - Waterproof structure of connector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a waterproof structure of a connector for waterproofing a female connector connecting portion fitted to a male connector such as a diode built-in connector.

(Prior Art) As a waterproof structure of a conventional connector, for example, there is one as shown in FIG. 4 (Actual No. 62-28371). This FIG. 4 relates to a transfer molding connector as an electronic function part,
It shows a male connector 1 and a female connector 3. In the male connector 1, a diode element (not shown) is electrically adhesively connected to two or more multiple lead terminals 5, and the base end of the lead terminal 5 including the element mounting portion is covered with an insulator 7 formed by transfer molding. is doing. In this case, the molding die of the insulator 7 is generally opened and closed in a direction perpendicular to the longitudinal direction of the lead terminal 5, particularly in the thickness direction of the terminal indicated by the arrow, due to restrictions based on the production method and the arrangement space.

On the other hand, when the male connector 1 is fitted to the female connector 3, the fitting portion is required to be waterproofed in order to protect the electrical connection portions of the both from water. Conventionally,
This request has been made by the sealing material 9 such as an O-ring and packing. That is, the insulator 7 of the male connector 1
5 is provided with a circumferential continuous groove 11 shown in FIG. 5, the sealing material 9 is fitted into the groove 11, and the housing 13 of the female connector 3 is provided with a hood 15 into which the insulator 7 is inserted. The sealing material 9 is closely attached to the inner surface of 15.

(Problems to be solved by the invention) However, a so-called resin burr 17 is formed on the male connector 1 for transfer molding the insulator 7 along the parting line of the molding die with respect to the insulator 7.
When the molding die is moved in the direction of the arrow in the figure, the burrs 17a on the two side surfaces of the insulator 7 extend in the connector insertion / removal direction. Therefore, in the conventional waterproof structure, as shown in FIG. 5, the sealing material 9 is used for the insulator 7 and the hood due to the resin burr 17.
There was a limit to the sealing function because it did not adhere well to 15.

In order to solve this, in Japanese Utility Model Laid-Open No. 62-28371, as shown in FIG. 6, a large diameter portion 19 is provided on the opening side of the hood 15, and an end plug type seal is provided at the end of the insulator 7 of the male connector 1. Insert the material 21 and attach the outer peripheral surface of this sealing material 21 to the large diameter portion of the hood 15.
19 The structure is closely attached to the inner surface. However, even in such a structure, the sealing function is the outer surface of the end plug 21 and the hood 15.
Since it is performed only between the inner surface of the large diameter portion 19 of
There is a limit in securing the length of the sealing surface (length in the left-right direction in FIG. 6), and it is unavoidable that the sealing function is improved. Further, since the end plug 21 has a structure in which it is press-fitted between the hood 15 and the insulator 7, for example, a bulge portion is formed at the end of the insulator 7.
In the case where the end plug 21 is provided with 23, the end plug 21 cannot be fitted into the bulging portion 23 well, and in the mounted state, the reaction force in the pull-out direction always acts on the end plug 21. Moreover, when the male connector 1 shakes with respect to the female connector 3 due to vibration or the like,
The vibration is directly transmitted to the end plug 21, and there is a problem that the end plug 21 is likely to come off together with the reaction force in the pulling direction. A similar problem may occur in a fuse or the like in which a plastic molded product is fitted to the base end as an electronic functional component.

Therefore, an object of the present invention is to provide a connector water discharge structure in which the sealing length can be secured without making the size large and the sealing function can be remarkably improved, and the end plug cannot be easily removed.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, the present invention relates to an electrical functional component in which the base end portions of multiple lead terminals are covered with an insulator, and the lead wires. A hood for accommodating the insulator of the electric functional component from the opening side at one end side of the terminal accommodating chamber containing the terminal and a lead terminal of the electric functional component accommodated in the hood facing the terminal side so as to combine the two. And a connector provided with an insertion hole of the hood, and a sealing wall portion is provided on the outer periphery of the hood to form a sealing concave portion opened on the opening side of the hood. An end plug including a ring-shaped seal portion that is in tight elastic contact with both the outer surface and an end wall portion that closes the opening side of the hood is provided.

Further, the end plug is provided with a projection, and the seal wall is provided with a locking hole for locking the projection.

Further, the sealing portion of the end plug is composed of a core portion formed of a hard resin and an elastic portion obtained by molding an elastic body on the inner and outer surfaces of the core portion, and the core portion is integral with the end wall portion formed of the hard resin. And

(Function) In the electric functional component, the lead terminal can be made to face the terminal side from the insertion hole and the both can be coupled. At this time, the electric functional parts are stored in the hood. Next, the ring-shaped seal part of the end plug is made to face the recess for sealing formed on the outer periphery of the hood, and the end wall of the end plug is pushed in, the seal part is pressed into the recess for sealing, and the inner surface of the seal wall and the outer surface of the hood are pressed. And close contact with both. Therefore, the sealing surface is long formed on both the inner surface of the seal wall portion and the outer surface of the hood.
Since the storage of the electric functional component in the hood and the press-fitting of the end plug into the sealing recess are performed separately, it is possible to suppress the vibration of the electric functional component from being directly transmitted to the end plug.

In the case where the end plug is provided with the projection and the seal wall is provided with the locking hole for locking the projection, the end plug can be prevented from coming off by locking the projection in the locking hole.

When the seal part of the end plug is molded with a core part molded with hard resin and an elastic part molded with an elastic body on the inner and outer surfaces of the core part, and the core part is integrally formed with the end wall part molded with hard resin The shape of the seal portion is maintained in the plug, and it becomes easy to press the end plug into the recess for sealing.

(Embodiment) An embodiment of the present invention will be described below.

FIG. 1 is a sectional view according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view. In FIGS. 1 and 2, the same components as those in FIGS. 4 to 6 are designated by the same reference numerals.

The male connector 1 which is a connector with a built-in diode as an electric functional component has its insulator 7 provided with the resin burr mentioned above, but the illustration thereof is omitted.

A female connector 3 as a connector to which the male connector 1 is coupled is provided with a hood 15 for accommodating the insulator 7 of the male connector 1 from the opening side at one end of a female housing 13, and a lead terminal 5 surrounded by the hood 15. It has the same number of insertion holes 27 as those. And the terminal accommodating chamber 13a of the female housing 13
A female terminal 31 is incorporated therein as a terminal connected to the lead wire 29.

The male connector 1 is inserted from the opening side of the hood 15, the insulator 7 is stored in the storage chamber 33, the lead terminal 5 is exposed from the insertion hole 27 to the female terminal 31 side, and the lead terminal 5 is coupled to the female terminal 31. Has been done.

The hood 15 of the female housing 25 is formed as shown in FIGS. 1 and 2 so that the entire storage chamber 33 of the hood 15 fits the insulator 7. The outer wall of the peripheral wall 35 of the hood 15 has a rounded shape with its corners dropped as shown in FIG.

On the other hand, a seal wall portion 37 is formed integrally with the female housing 13 on the outer periphery of the hood 15 so as to cover the entire hood 15. The inner surface of the seal wall portion 37 is formed in a shape substantially similar to the outer surface of the peripheral wall 35 of the hood 15, and has a rounded cross-sectional shape. Therefore, the sealing recess 43 opened on the opening side of the hood 15 is formed between the peripheral wall 35 of the hood 15 and the seal wall portion 37. The opening end 39 of the seal wall portion 37 projects slightly from the opening end 41 of the peripheral wall 35 of the hood 15, and the amount of projection is substantially the same as the thickness of the end wall portion 51 of the end plug 45 described later.

The end plug 45 is press-fitted into the sealing recess 43 and closes the opening side of the hood 15, and the end surface 47 is flush with the opening end 39 of the seal wall portion 37. The end plug 45 is formed of an elastic body such as rubber or soft resin, and has an integral structure of the seal portion 49 and the end wall portion 51. Inner surface 45 of end plug 45
Is formed in a shape similar to the outer surface of the peripheral wall 35 of the hood 15, and the inner surface 53 is formed slightly smaller than the peripheral wall 35. The outer surface 55 of the seal portion 49 is formed in a shape substantially similar to the inner surface of the seal wall portion 37, and the outer surface 55 is formed slightly larger than the inner surface of the seal wall portion 37. The inner surface 53 and the outer surface 55 of the seal portion 49 have good adhesion of the seal surface,
A plurality of circumferential grooves 57 are formed in each circumferential direction. In this embodiment, four circumferential grooves 57 are formed on the inner surface 53 and three circumferential grooves 57 are formed on the outer surface 55. The length of the end plug 45 is such that when the end face 47 is flush with the open end 39 of the seal wall portion 37, the tip 59 is in close contact with the inner wall 61 of the sealing recess 43. Seal part
The inner and outer peripheries of the tip of 49 are as thick as the depth of the circumferential groove 57, and are tapered. Therefore, when the end plug 45 is press-fitted into the sealing recess 43, the work can be easily performed. Further, the end plug 45 is provided with a pair of projections 63 on the end wall 51 side, and these projections 63 are locked in locking holes 65 formed on the opening end 39 side of the seal wall 37.

Next, the connection of the male and female connectors 1 and 3 having such a structure will be described.

In the male connector 1, the lead terminal 5 is inserted from the opening side of the hood 15 in the female connector 3, the lead terminal 5 is exposed to the female terminal 31 side through the insertion hole 27, and the both are coupled. In this state, the insulator 7 of the male connector 1 is accommodated in the storage chamber 33 of the hood 15 in its entirety. Next, the tip 59 side of the end plug 45 is opposed to the opening side of the sealing recess 43,
By pressing the end wall portion 51, the seal portion 49 is press-fitted into the sealing recess 43. The end wall portion 51 is the opening end of the seal wall portion 37.
When it becomes substantially flush with 39, the projection 63 elastically clicks into the locking hole 65 to prevent the end plug 45 from coming off.

In this state, the insulator 7 of the male connector 1 and the end plug 45 are partitioned by the peripheral wall 35 of the hood 15. Therefore, even if the male connector 1 shakes due to vibration or the like, the vibration will end up on the end plug 45 side. It is suppressed to be directly transmitted to. Further, since the end plug 45 is not directly press-fitted into the insulator 7, even if the end portion of the insulator 7 has a bulge as shown in FIG. It does not work. As a result, the end plug 45 is prevented from coming off.

Even if the protrusion 63 and the locking hole 65 are omitted, the reaction force in the pulling direction does not act on the end plug 45 as described above, and the vibration of the insulator 7 may directly act on the end plug 45. Since it is suppressed, the end plug 45 is hard to come off.

If the connection of the male connector 1 to the female connector 3 is insufficient, the end face 47 of the end plug 45 cannot be press-fitted until it becomes flush with the opening end 39 of the seal wall portion 37. You can check defects.

Next, the sealing function of the end plug 45 thus press-fitted will be described.

Since the inner surface 53 of the seal portion 49 is formed slightly smaller than the outer surface of the peripheral wall 35 and the peripheral groove 57 is formed, the peripheral wall 35 is formed.
Locally and densely contact the outer surface of. Similarly, the outer surface 55 of the seal portion 49 is formed to be slightly larger than the inner surface of the seal wall portion 37,
In addition, due to the presence of the circumferential groove 57, the inner wall of the seal wall portion 37 is locally and closely elastically contacted. Therefore, the sealing portion 49 and the peripheral wall 35 of the hood 15
A sealing surface is secured both between the outer surface and the inner surface of the sealing wall portion 37, and the length of the sealing surface that is about twice the conventional length can be secured without increasing the overall length of the connector. A dramatic improvement can be achieved. Further, the sealing surface formed inside and outside the seal portion 49 is folded back at the tip 59 of the seal portion 49, and has a function like a so-called labyrinth packing, and the sealing function is further improved. . The tip 59 of the seal portion 49 has a seal recess 43.
The sealing function is further improved due to the close contact with the inner wall 61 of the inner wall 61 and the local contact with the peripheral groove 57.

FIG. 3 shows a modification 67 of the end plug 45. This end plug
67 is a ring-shaped core portion 69 in which the sealing portion 49 is made of hard resin.
Also, an elastic portion 71 is formed by molding rubber or a soft resin as an elastic body on the inner and outer surfaces of the core portion 69. The end wall portion 73 is made of hard resin and is integrally formed with the core portion 69.

According to this example, the shape of the seal portion 49 can be maintained by the core portion 69, and press fitting into the sealing recess 43 becomes easier. Also, when press-fitting the end plug 67 into the sealing recess 43,
Positioning is performed by abutting the hard end wall portion 73 against the open end of the hood 15, and positioning at the time of press fitting becomes easier.

The protrusion 75 is formed on the side of the end wall 73, and in order to facilitate insertion into the locking hole 65, a transversal slope 77 is formed at the tip of the protrusion 75 in the insertion direction. Therefore, the hard protrusion 75 is locked in the locking hole 65, and the end plug 67 can be more reliably prevented from coming off.

The invention is not limited to the connector molded by transfer molding, but can be applied to a fuse, a diode, a capacitor and the like in which a plastic molded product is fitted to the base end.

[Effects of the Invention] As is clear from the above, according to the configuration of the present invention, the seal portion of the end plug is press-fitted into the sealing recess so that it is elastically contacted with both the inner surface of the seal wall and the outer surface of the hood. A long sealing surface can be secured, and the sealing function can be dramatically improved. Further, since the end plug is not directly press-fitted into the insulator of the electric functional component, the reaction force in the removal direction due to the press-fitting does not act, and the vibration of the insulator may be directly transmitted to the end plug. As a result, the end plug can be prevented from coming off.

Further, when the end plug is provided with the projection and the seal wall is provided with the locking hole, the end plug can be more reliably prevented from coming off.

The end plug is composed of a core part molded with hard resin and an elastic part molded with an elastic body on the inner and outer surfaces of the core part. The core part is a seal formed by integrally molding with the end wall part molded with hard resin. The shape of the portion can be retained by the hard core portion, and the work of press-fitting the end plug can be performed more easily.

[Brief description of drawings]

1 is a sectional view of the present invention, FIG. 2 is an exploded perspective view of the same, FIG. 3 is a sectional view showing a modified example of the end plug, FIG. 4 is a perspective view of a conventional example, and FIG. FIG. 6 is a sectional view of another conventional example. 1 …… Male connector (electrical functional part) 3 …… Female connector (connector) 5 …… Lead terminal, 7 …… Insulator 13a …… Terminal chamber, 15 …… Hood 27 …… Insertion hole, 29 …… Lead Wire 31 …… Female terminal (terminal), 37 …… Seal wall part 43 …… Seal recess, 45,67 …… End plug 49 …… Seal part, 51,73 …… End wall part 63,75 …… Protrusion Part, 65 ... Locking hole 69 ... Core part, 71 ... Elastic part

Claims (3)

[Scope of utility model registration request] 1. An electrical functional component in which a base end portion of multiple lead terminals is covered with an insulator, and an insulator of the electrical functional component is opened at one end side of a terminal accommodating chamber having a terminal connected to a lead wire therein. A hood to be housed from the side and a connector provided with an insertion hole for connecting the lead terminal of the electric functional part housed in the hood to the terminal side so as to connect the two, and a seal wall portion around the outer periphery of the hood. To form a sealing concave portion opened on the opening side of the hood, and a ring-shaped sealing portion press-fitted into the concave portion to make a close elastic contact with both the inner surface of the seal wall and the outer surface of the hood and the opening side of the hood. A waterproof structure for a connector, which is provided with an end plug composed of a closed end wall portion. 2. The waterproof structure for a connector according to claim 1, wherein a projection is provided on the end plug, and a locking hole for locking the projection is provided on the seal wall. 3. A sealing portion of the end plug comprises a core portion formed of a hard resin and an elastic portion formed by molding an elastic body on inner and outer surfaces of the core portion, and the core portion includes an end wall portion formed of a hard resin. The waterproof structure for a connector according to claim 1, wherein the waterproof structure is integrated.