JP5547593B2 - Connector housing with mat seal - Google Patents

Description

  The present invention relates to a connector housing with a mat seal in which a rubber mat seal is integrally formed on a resin connector housing by injection molding such as two-color molding.

  2. Description of the Related Art Conventionally, a connector housing with a mat seal for a waterproof connector obtained by integrally molding a thick plate-shaped waterproof rubber plug called a mat seal into a hard resin connector housing. An example of this is shown in FIG.

  In the connector housing 100 with mat seal, a rubber mat seal 120 is integrally formed on the inner surface 111 a side of the rear wall portion 111 of the hard resin connector housing 110, and the mat is inserted from the terminal insertion hole 112 of the rear wall portion 111. By inserting a terminal (not shown) through a through hole 122 of the seal 120 into a terminal receiving chamber of an inner housing (not shown) incorporated in the connector housing 110, the inner periphery of the through hole 122 of the mat seal 120 extends from the terminal. In close contact with the outer periphery of the electric wire not to be sealed, the connector housing 110 and the electric wire are sealed.

JP-A-8-238627

  By the way, when such a rubber mat seal 120 is integrally formed on the hard resin connector housing 110 by injection molding such as two-color molding, as shown in FIG. 13B, the hard resin connector housing is formed. Since a gap is formed between the inner surface 111a of the rear wall portion 110 of the 110 and the front surface 130a of the mold 130, as shown in FIG. 13A, a rubber mat seal 120 and a hard resin connector housing are provided. The rubber burrs B as molding defects were likely to occur at the inner surface 111a of the rear wall portion 110 and the boundary portion of the terminal insertion hole 112.

  Therefore, the present invention has been made to solve the above-mentioned problems, and it is easy and reliable to generate a molding defect of a rubber burr that is easily formed at a boundary portion between a rubber mat seal and a resin connector housing. An object is to provide a connector housing with a mat seal that can be prevented.

According to the first aspect of the present invention, a rear wall portion that closes the rear end opening of the hood portion is provided at the rear end of the cylindrical hood portion whose front end surface is open, and terminals can be inserted into the rear wall portion from the rear. A resin connector housing provided with a plurality of terminal insertion holes, and a front mold and a rear mold so as to sandwich the rear wall portion inside and outside the hood portion of the connector housing, and the rear A rubber molding material is injected from a gate provided in the rear mold into a seal molding cavity secured between the wall and the front mold, so that it is integrally formed on the inner surface of the rear wall. is composed of a substantially rectangular plate-shaped mat seal, the mat seal, the through hole through which the communicating with the terminal insertion holes of the rear wall of each of said connector housing is formed, and the inner periphery of each of the through-hole Through the terminal insertion hole and the through hole. Inside the inserted annular sealing lip mat seal can meet many connector housing formed is in close contact with the outer surface of the electric wire extending from the terminal to the rear of the connector housing, the terminal of the inner surface of the rear wall of the connector housing An annular convex part is formed around the insertion hole for burr cutting, and after the annular convex part is crushed by the front mold when the front mold and the rear mold are clamped, The rubber molding material is filled into the seal molding cavity to mold the mat seal , and the outer surface of the inner surface of the rear wall portion of the connector housing is formed with a ring for burr cutting outside the area where the mat seal is rubber molded. A convex part is separately formed, and after the annular convex part is crushed by the front mold when the front mold and the rear mold are clamped, the rubber molding material is placed in the seal molding cavity. There the mat seal is filled is characterized in that the so that the molded.

  A second aspect of the present invention is the connector housing with a mat seal according to the first aspect, wherein the annular convex portion is provided at a position away from the periphery of the terminal insertion hole.

The invention according to claim 3, a mat seal with the connector housing of claim 1, wherein, around the pin insertion holes of the outer surface of the rear wall of the connector housing, the annular convex portion in a burr cutting formed And after the annular convex portion is crushed by the rear mold when the front mold and the rear mold are clamped, the seal molding cavity is filled with the rubber molding material, A mat seal is formed.

As described above, according to the invention of claim 1, the periphery of the inner surface terminal insertion holes of the rear wall of the connector housing, with a burr cutting to form the annular convex portion, the convex portion of the annular Since the front mold and the rear mold are crushed by the front mold, the seal molding cavity is filled with a rubber molding material to form a mat seal. It is possible to easily and reliably prevent the occurrence of rubber burrs that are easily formed at the boundary between the terminal insertion hole on the inner surface side of the housing and the through hole of the rubber mat seal. In particular, an annular protrusion is separately formed for burr cutting outside the area where the mat seal on the inner surface of the rear wall portion of the connector housing is rubber-molded, and the annular protrusion is formed in the front mold and the rear mold. After crushing with the front mold at the time of mold clamping, a rubber molding material was filled in the seal molding cavity to form a mat seal, so the rubber mat seal and the rear wall portion of the resin connector housing It is possible to easily and surely prevent the occurrence of rubber burrs that are easily formed at the boundary portion of the inner surface of the connector, and it is possible to further improve the quality of the connector housing with mat seal.

  According to the invention of claim 2, since the annular convex portion is provided at a position away from the periphery of the terminal insertion hole, even if the annular convex portion is crushed to the terminal insertion hole side by the front mold, It is possible to reliably prevent the terminal insertion hole from being blocked by the projected portion.

According to the invention of claim 3, the circumferential wall portion of the outer surface terminal insertion holes after the connector housing, the protruding portion of the annular form with a burr cutting, the front mold and the rear convex portion of the annular After crushing with the rear mold during mold clamping, the seal molding cavity was filled with a rubber molding material to form a mat seal, so the outer surface side of the resin outer housing It is possible to easily and reliably prevent the occurrence of rubber burrs that are easily formed at the boundary between the terminal insertion hole and the through hole of the rubber mat seal.

It is the perspective view which showed the connector housing single-piece | unit which comprises the connector housing with a mat | matte seal of one Embodiment of this invention from the front side. It is the perspective view which looked at the said connector housing single-piece | unit from the rear side. It is a front view of the said connector housing single-piece | unit. FIG. 4 is a cross-sectional view taken along the line II in FIG. 3. (A) is an expanded sectional view of the X part of FIG. 4, (b) is an expanded sectional view of the Y part of FIG. (A) is an enlarged cross-sectional view showing a state where the mold hits the convex part for burr cutting in the X part in FIG. 4, and (b) shows the mold hitting the convex part for burr cutting in the Y part in FIG. 4. It is an expanded sectional view which shows the state. 4A is an enlarged cross-sectional view showing a state in which the X-part burr cutting convex part in FIG. 4 is crushed with a mold, and FIG. 4B is a Y-type burr cutting convex part in FIG. It is an expanded sectional view which shows the state. It is the perspective view which looked at the connector housing with a mat seal which formed the mat seal integrally in the above-mentioned connector housing from the front side. It is the perspective view which looked at the connector housing with a mat seal from the back side. It is a front view of the connector housing with the mat seal. It is II-II arrow sectional drawing of FIG. It is the III-III arrow sectional drawing of FIG. (A) is sectional drawing of the conventional connector housing with a mat seal, (b) is sectional drawing of the connector housing single-piece | unit which comprises the conventional connector housing with a mat seal.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing a connector housing unit constituting a connector housing with a mat seal according to an embodiment of the present invention as seen from the front side, FIG. 2 is a perspective view showing the connector housing unit from the rear side, and FIG. 4 is a front view of the connector housing alone, FIG. 4 is a cross-sectional view taken along the line II of FIG. 3, FIG. 5A is an enlarged cross-sectional view of the X portion of FIG. 4, and FIG. 6 (a) is an enlarged cross-sectional view showing a state where the mold has hit the convex part for deburring at the X portion in FIG. 4, and FIG. 6 (b) is for deburring at the Y portion in FIG. FIG. 7A is an enlarged cross-sectional view showing a state in which the mold hits the convex portion of FIG. 7, FIG. 7A is an enlarged cross-sectional view showing a state in which the convex portion for burr cutting of the portion X in FIG. b) is an enlarged cross-sectional view showing a state where the protrusion for burr cutting at the Y portion in FIG. 4 is crushed by a mold, and FIG. FIG. 9 is a perspective view of the connector housing with mat seal formed from the front side, FIG. 9 is a perspective view of the connector housing with mat seal formed from the rear side, and FIG. 10 is a front view of the connector housing with mat seal. 11 is a cross-sectional view taken along the line II-II in FIG. 10, and FIG. 12 is a cross-sectional view taken along the line III-III in FIG.

  As shown in FIG. 1, the outer housing with mat seal (connector housing with mat seal) 1 of the present invention is a main part for constituting a waterproof connector. This waterproof connector includes an outer housing (connector housing) 10 and an inner housing (not shown) made of a molded product of a hard synthetic resin, and a mat seal (an elastic seal member and a waterproof rubber plug) made of a molded product of an elastic material such as rubber. 20) and a plurality of terminals 31 attached to the tip of the electric wire 30.

  Although not shown, the inner housing made of hard synthetic resin is provided with a plurality of terminal accommodating chambers into which the terminals 31 attached to the front ends of the electric wires 30 can be inserted from the rear end. The rear wall surface of the housing whose end is open is a seal set surface that is in close contact with the front surface of the mat seal 20.

  As shown in FIGS. 1 to 4, the outer housing 10 made of hard synthetic resin includes a rectangular tubular hood portion 11 having a front end surface opened and a rear wall portion 12 that closes the rear end opening of the hood portion 11. Have. The rear wall 12 is formed with terminal insertion holes 13 corresponding to the terminal housing chambers of the inner housing, and the terminals 31 are inserted into the terminal housing chambers of the inner housing through the terminal insertion holes 13. ing.

As shown in FIGS. 1, 3, and 4, a recess 17 into which the mat seal 20 is integrally formed is formed on the inner surface 12a of the rear wall portion 12 of the outer housing 10, and the recess 17 and the inner surface 12a. On the inner surface 12a of the boundary portion, a quadrangular annular convex portion 18 is integrally protruded for burr cutting. 7A, when the mat seal 20 is formed, the square annular convex portion 18 sandwiches the rear wall portion 12 inside and outside the hood portion 11 of the outer housing 10. As shown in FIG. The front mold 50 and the rear mold 55 disposed in the front mold 50 are crushed by the front mold 50. Further, as shown in FIGS. Around the four terminal insertion holes 13 positioned above and below both sides of the inner surface 12a of the portion 12, annular convex portions 19 are integrally formed for burr cutting. As shown in FIGS. 5 (b) and 7 (b), each annular convex portion 19 sandwiches the rear wall portion 12 inside and outside the hood portion 11 of the outer housing 10. When the front mold 50 and the rear mold 55 arranged in the front mold 50 are crushed by the front mold 50, the convex portions 19 are not clogged and deformed so as not to block the terminal insertion holes 13. The top of 19 is provided in the periphery of the straight portion that is separated from each terminal insertion hole 13 by a predetermined distance T.

  Further, as shown in FIGS. 2 and 4, around the four terminal insertion holes 13 located on the upper and lower sides of the outer surface 12 b of the rear wall portion 12 of the outer housing 10, an annular convex portion is used for burr cutting. 19 'are integrally formed to project. As shown in FIG. 7 (b), each annular projection 19 ′ is formed so that the projection 19 ′ is formed inside and outside the hood portion 11 of the outer housing 10 when the mat seal 20 is formed. The front mold 50 and the rear mold 55 arranged so as to sandwich the mold are crushed by the rear mold 55.

  As shown in FIGS. 8 to 12, the rubber mat seal 20 is disposed on the inner surface 12 a side of the rear wall portion 12 as a wire drawing portion of the rear portion of the outer housing 10, so that the outer housing 10 and the inner housing 20 are arranged. The water seal between the housing and the electric wire 30 is formed integrally with the inner surface 12a of the rear wall portion 12 of the outer housing 10, and a seal set at the rear end of the inner housing is formed on the front surface of the mat seal 20. The surfaces are in close contact.

  The mat seal 20 includes a thick, substantially rectangular plate-like seal body 21, and the electric wires 30 passing through the terminal insertion holes 13 of the rear wall portion 12 of the outer housing 10 are inserted into the seal body 21. A plurality of through holes 22 are provided corresponding to the respective terminal insertion holes 13. On the inner peripheral surface of each through hole 22, an annular inner peripheral lip (annular seal lip) 23 that is in close contact with the outer periphery of the electric wire 30 is provided in a plurality of stages at intervals in the axial direction. The attached terminal 31 is inserted through the through hole 22 while expanding the through hole 22 by using the elasticity of the mat seal 20, so that the terminal 31 passes through the through hole 22 and then moves backward from the terminal 31. The inner peripheral lip 23 is in close contact with the outer periphery of the extending electric wire 30, thereby sealing the gap between the through hole 22 and the electric wire 30. Further, on the outer periphery of the seal main body 21 of the mat seal 20, there is an outer peripheral lip 29 that, when fitted to the mating connector, closely contacts the inner periphery of the mating connector housing and stops water between the mating connector housing and the inner housing. Is provided. An extension 28 is attached to the outer periphery of the seal body 21.

  The mat seal 20 has a front mold 50 and a rear mold 55 arranged so that the rear wall 12 is sandwiched between the inside and outside of the hood portion 11 of the outer housing 10, and between the rear wall 12 and the front mold 50. A silicone rubber molding material (not shown) as a rubber molding material is injected into a seal molding cavity secured in the rear mold 55 from a gate provided in the rear mold 55, and is integrally molded.

  In this case, as shown in FIGS. 1 to 3, a plurality of silicone rubber moldings separated from each other outside the region where the plurality of terminal insertion holes 13 are formed in the outer surface 12 b of the rear wall portion 12 of the outer housing 10. Inlet / outlets 15A to 15D for materials (rubber molding materials) are provided. These inlets / outlets 15 </ b> A to 15 </ b> D are arranged at the four corners of the rectangular seal body 21. Moreover, the shape of these entrances / exits 15A-15D may be circular or square.

  Further, on the outer surface 12b of the rear wall portion 12 of the outer housing 10 on the outer side of the inlets / outlets 15A to 15D of these silicone rubber molding materials, an annular rib 14 surrounding the inner region is integrally formed. And the area | region inside this cyclic | annular rib 14 is used as the storage space 16 which accumulates the molding material 26 which overflowed from the cavity for seal molding, and one inlet / outlet in the inlet / outlet 15A-15D of several silicone rubber molding material The mat seal 20 is molded using 15A as an inlet / outlet for a gate for injecting a silicone rubber molding material into the seal molding cavity and using the other inlets / outlets 15B to 15D as an inlet / outlet for overflow.

  More specifically, the outer housing 10 is molded by injection molding in which a molten thermoplastic resin is injected into a mold. As described above, the mat seal 20 is formed by performing two-color molding (or insert molding) on the molded outer housing 10, and is applied to the inner surface 12 a of the rear wall portion 12 of the outer housing 10. It is in close contact with no gap.

  The mat seal 20 exerts an adhesive force on the thermoplastic resin constituting the outer housing 10 but does not exert an adhesive force on the metal material (chromium steel) constituting the injection mold. Because it is molded using, for example, “liquid silicone rubber selective adhesive material for polyamide resin” (product number: X-34-1625A / B) manufactured by Shin-Etsu Chemical Co., Ltd. The outer peripheral portion of the rear end surface of the mat seal 20 and the extending portion 28 are bonded to the rear wall portion 12 of the outer housing 10. In addition, as a silicone rubber molding material, an adhesion-imparting agent using silicone rubber such as PBT or LCP is also effective.

  In order to manufacture an integral part of the outer housing 10 and the mat seal 20, first, the outer housing 10 is formed by injecting molten thermoplastic resin into a mold. Next, when the thermoplastic resin of the outer housing 10 is solidified, a mold for molding the inner surface 12a side of the rear wall 12 of the outer housing 10 is replaced with a front mold 50 for molding the front side of the mat seal 20. Further, after replacing the mold for molding the outer surface 12b side of the rear wall portion 12 of the outer housing 10 with the rear mold 55 for molding the rear surface side of the mat seal 20, a liquid silicone rubber molding material is used. Injection into the gate of the rear mold 55. When the rubber mold is clamped, as shown in FIGS. 7 (a) and 7 (b), a square ring is used to deburr the inner surface 12a of the rear wall 12 of the outer housing 10 on the front surface of the front mold 50. 7 to crush the annular projections 19 for cutting burrs around the projections 18 and the terminal insertion holes 13 to eliminate the gaps between them, and as shown in FIG. On the rear surface, the annular convex portion 19 'is crushed for burr cutting around the terminal insertion hole 13 on the outer surface 12b of the rear wall portion 12 of the outer housing 10 to eliminate the gap between the two, and then rubber molding is performed. Do.

  Here, since the melting point of the thermoplastic resin constituting the outer housing 10 is set to be higher than the melting point of the silicone rubber molding material, the outer housing 10 melts when molding is performed according to the above procedure. There is nothing. In addition, since the silicone rubber molding material does not exert an adhesive force to the metal constituting the mold, the mat seal 20 extends from the outer peripheral portion of the rear end surface without damaging the bonding portion between the outer housing 10 and the mat seal 20. The outer housing 10 and the mat seal 20 are removed from the mold in a state where the protruding portion 28 is bonded to the joint portion of the inner surface 12a of the rear wall portion 12 of the outer housing 10. Further, there is no rubber burr at the boundary between the inner surface 12a of the rear wall portion 12 of the outer housing 10 and the extending portion 28 of the mat seal 20, and the inner surface 12a of the rear wall portion 12 of the outer housing 10 is further eliminated. In addition, no rubber burrs are generated around the terminal insertion holes 13 on the outer surface 12b.

  Thus, after obtaining the integrally molded outer housing 10 and mat seal 20, the inner housing is inserted into the outer housing 10, and the seal set surface at the rear end of the inner housing is brought into close contact with the front surface of the mat seal 20. Let

  Next, the terminal 31 attached to the tip of the electric wire 30 is inserted into the terminal housing chamber of the inner housing through the terminal insertion hole 13 of the outer housing 10 and the through hole 22 of the mat seal 20, and each terminal 31 is inserted into the terminal housing chamber. Fix it.

  At this time, since the mat seal 20 is integrated with the outer housing 10 in advance, the parts can be easily handled and the mat seal 20 can be held in a stable state, and the inner housing and the outer housing 10 can be held. The combination with the mat seal 20 can also be performed smoothly.

  Next, a mating connector (not shown) is fitted with the waterproof connector of this embodiment. Then, the mating connector housing is inserted into the annular space inside the hood portion 11 of the outer housing 10 and is fitted into the inner housing. At the same time, the terminals 31 accommodated in the terminal housing chamber of the inner housing are accommodated in the mating connector housing. The wires are connected to each other and the wires are connected to each other.

  In such a fitted state, the inner peripheral lip 23 of the mat seal 20 is elastically adhered to the outer periphery of the electric wire 30 inserted through the through hole 22 of the mat seal 20, so that water or the like is in contact with the inner periphery. Intrusion into the housing can be reliably prevented. Further, since the outer peripheral lip 29 of the mat seal 20 stops water between the mating connector housing and the inner housing, the connection space between the terminal inside the mating connector housing and the terminal 31 inside the inner housing is surely stopped. be able to.

  By forming the outer housing 10 with the mat seal 20 as described above, the following effects can be obtained. That is, when the mat seal 20 is molded, the gate inlet / outlet 15A for injecting the silicone rubber molding material into the seal molding cavity and the overflow inlet / outlet for overflowing the excess silicone rubber molding material out of the cavity 15B to 15D are secured, and further, the outer space 12b of the rear wall portion 12 of the outer housing 10 is molded after securing the storage space 16 for storing the silicone rubber molding material overflowed from the cavity, so that the sealing performance of the mat seal 20 is achieved. Thus, the mat seal 20 can be easily molded integrally without worrying about leaving a molding defect due to gas accumulation in the functional portion that exhibits the above, and the waterproof reliability can be improved.

  Further, a quadrangular annular convex portion 18 is formed for burr cutting outside the region where the mat seal 20 of the inner surface 12a of the rear wall portion 12 of the connector housing 10 is rubber-molded. Since the mat seal 20 is molded by filling the seal molding cavity with the rubber molding material after the front mold 50 is pressed and crushed when the mold 50 is clamped, the rubber mat seal 20 can easily and reliably prevent the occurrence of rubber burrs (molding defects) that are easily formed at the boundary portion between the inner surface of the rear wall portion 12 of the connector housing 10 made of resin and the resin, and the quality of the connector housing 1 with mat seal. Can be further improved.

  Further, annular protrusions 19 and 19 'are formed for burr cutting around the inner surface 12a and the outer surface 12b of the rear wall 12 of the outer housing 10 around the terminal insertion holes 13, respectively. 19 and 19 'are pressed and crushed by the front mold 50 and the rear mold 55, respectively, when the front mold 50 and the rear mold 55 are clamped, and then the rubber molding material is put into the seal molding cavity. Since the mat seal 20 is molded integrally, the rubber burrs easily formed at the boundary between the terminal insertion hole 13 of the resin outer housing 10 and the through hole 22 of the rubber mat seal 20 are formed. Occurrence can be prevented easily and reliably.

  Furthermore, each annular convex portion 19 on the inner surface 12a side of the rear wall portion 12 of the connector housing 10 is provided at a position away from the periphery of the terminal insertion hole 13 by a predetermined distance T. Even if the annular protrusion 19 is crushed toward the terminal insertion hole 13, it is possible to reliably prevent the terminal insertion hole 13 from being blocked by the crushed protrusion 19.

  In addition, according to the said embodiment, although the silicone rubber molding material was used as a rubber molding material, of course, a rubber molding material is not restricted to a silicone rubber molding material.

  Further, according to the embodiment, around the four terminal insertion holes located on the upper and lower sides of the rear wall portion of the outer housing near the gate inlet and outlet for the silicone rubber molding material, Although the burr cutting convex portions are integrally formed to project, the burr cutting convex portions may be integrally formed around the other terminal insertion holes.

  Further, according to the embodiment, the burr cutting convex portion is integrally formed to project in a triangular cross section, but it is needless to say that various shapes such as a trapezoidal cross section and a semicircular cross section may be used.

1 Outer housing with mat seal (Connector housing with mat seal)
10 Outer housing (connector housing)
DESCRIPTION OF SYMBOLS 11 Hood | hood part 12 Rear wall part 12a Inner surface 12b Outer surface 13 Terminal insertion hole 18, 19, 19 'Annular convex part for burr cutting 20 Mat seal 22 Through-hole 23 Inner peripheral lip (annular seal lip)
50 Front mold 55 Rear mold

Claims (3)

A rear wall portion for closing the rear end opening of the hood portion is provided at the rear end of the cylindrical hood portion whose front end surface is open, and a plurality of terminal insertion holes through which terminals can be inserted from the rear are provided on the rear wall portion. A resin connector housing provided, and a front mold and a rear mold are disposed so as to sandwich the rear wall portion inside and outside a hood portion of the connector housing, and the rear wall portion and the front mold A substantially rectangular plate-shaped mat integrally formed on the inner surface of the rear wall portion by injecting a rubber molding material from a gate provided in the rear mold into a seal molding cavity secured between Each of the mat seals is formed with a through hole communicating with each of the terminal insertion holes of the rear wall portion of the connector housing, and the terminal insertion hole and the inner periphery of each of the through holes. The connector housing is passed through the through hole. Inside the inserted annular sealing lip mat seal can meet many connector housing formed is in close contact with the outer surface of the electric wire extending from the terminal to the rear of the ring,
Wherein the periphery of said terminal insertion hole of the inner surface of the rear wall of the connector housing, the convex portion of the annular is formed by a burr cutting convex portion of the annular clamping of the front mold and the rear mold In this case, after being crushed by the front mold, the seal molding cavity is filled with the rubber molding material to mold the mat seal, and the mat seal on the inner surface of the rear wall portion of the connector housing is molded with rubber. An annular projection is separately formed for burr cutting outside the region to be cut, and after the annular projection is crushed by the front mold when the front mold and the rear mold are clamped in the mat seals the connector housing, wherein the mat seal the rubber molding material is filled in the seal molding cavity is characterized in that the so that the molded. A connector housing with a mat seal according to claim 1,
The connector housing with a mat seal, wherein the annular convex portion is provided at a position away from the periphery of the terminal insertion hole. A connector housing with a mat seal according to claim 1,
Around the pin insertion holes of the outer surface of the rear wall of the connector housing, the convex portion of the annular is formed by a burr cutting convex portion of the annular clamping of the front mold and the rear mold after being crushed by the rear side mold upon, the mat seals the connector housing, wherein the mat seal the rubber molding material into the seal molding cavity is filled, characterized in that it has to be molded.

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