JP2020047403A - Connector and method for manufacturing connector - Google Patents

Abstract

To provide a connector which can improve molding accuracy of an opening of a hood part with which a mating connector is engaged, and can reduce molding failure.SOLUTION: A connector 10 includes a primary molding 21 in which each intermediate portion 20c has a held insulation state with a resin portion 22 by primary molding each of the intermediate portions 20c of a pair of bent and formed terminals 20 and 20, and a housing 11 as a secondary molding which integrally has a first cylindrical bottomed part 12 having a hood part 13 that stores each one end 20a side of a pair of terminals on one end 12a side and with which a mating connector is engaged by secondary molding the primary molding 21, and a second cylindrical part 14 that stores each other end side of the pair of terminals 20 and 20 on the other end side and with which other mating connector is engaged, where a peripheral wall 13a of the hood part 13 has a bored part 13b in an axial direction Z, and the primary molding 21 has a projection 24 facing the bored part 13b.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a connector suitable for use as a relay connector for an automatic transmission of an automobile, and a method of manufacturing the connector.

  For example, there is a connector disclosed in Patent Document 1 as a connector configured by insert molding a primary molded product in which a pair of terminals are inserted.

  As shown in FIG. 7, in the primary molding step, the connector 1 is formed by insert molding a primary molding block 5 in which the intermediate portions of the pair of terminals 6 and 6 are integrated with a synthetic resin material. In the above, the housing 2 is formed into a final shape by insert molding using a plurality of molding dies 7 and 8 with a synthetic resin material so as to include and integrate the primary molding block 5. You.

  At the time of the secondary molding of the housing 2, the lower tubular portion 3 to be fitted into the mounting hole 9 a of the bracket 9, and the illustration shown bent laterally from the upper end of the tubular portion 3. A thickened portion 2A is formed by a bar-shaped thinning piece 8a of a molding die 8 at a thick portion at the boundary with the hood portion 4 where the mating connector does not fit. Sinking due to resin shrinkage of the thick part is prevented.

JP-A-7-106045

  However, in the conventional connector 1, when the housing 2 is taken out of the molding die 8, there is nothing to support the frontage of the hood portion 4 of the housing 2, so that the frontage collapses. In addition, due to the fall of the frontage of the hood portion 4, the occurrence of a galling defect or the like in the frontage or the piece 8a for lightening cannot be smoothly removed, and the piece 8a is broken. Further, since the thickness of the lightening piece 8a is long, the piece 8a cannot be kept at its original position due to the resin pressure, and the piece 8a is broken, which causes a problem that a shape as designed cannot be manufactured.

  Then, this invention is made in order to solve the above-mentioned subject, and the connector which can improve the shaping | molding precision of the frontage of the hood part with which a mating connector fits, and can reduce a shaping | molding defect. And a method of manufacturing the connector.

  The present invention primarily forms each intermediate portion of at least a pair of bent terminals by forming the respective intermediate portions in a state of being insulated by a resin portion, and secondarily forms the primary molded product. Thereby, one end side of the pair of terminals is accommodated at one end side, and a bottomed first cylindrical portion having a hood portion to which a mating connector is fitted, and the other end side of the pair of terminals is provided at the other end side. A housing as a secondary molded product integrally including a second tubular portion that is housed and fitted with another mating connector, and a peripheral wall of the hood portion is formed in an axial direction. It has a lightening portion, and the primary molded article has a protrusion at a position facing the lightening portion.

  Further, the present invention forms a primary molded product in which each intermediate portion of at least a pair of bent terminals is insulated by a resin portion by primary molding each intermediate portion, and forming the primary molded product. By the secondary molding, one end side of the pair of terminals is accommodated at one end side, and a bottomed first cylindrical portion having a hood portion to which a mating connector is fitted, and the pair of terminals at the other end side. And a second cylindrical portion in which the other end of the pair of terminals is accommodated, and a second cylindrical portion into which another mating connector is fitted. A primary molding step of covering each intermediate portion with the resin portion, and molding the primary molded article having a projection protruding in the axial direction, and the first molding step covering the primary molded article molded in the primary molding step. The first tubular portion and the second tubular portion And forming a hollow portion extending in the axial direction on the peripheral wall of the hood portion so as to face the projecting portion of the primary molded product in the secondary molding step. It is characterized by doing.

  According to the present invention, the peripheral wall of the hood to which the mating connector is fitted has a hollow portion in the axial direction, and the primary molded product has a projection at a position facing the lightening portion. The molding accuracy of the frontage can be improved, and molding defects can be reduced.

It is a perspective view showing the connector of one embodiment of the present invention. (A) is a perspective view of a primary molded product used for the connector, and (b) is a perspective view showing a cross section of a main part of a secondary molded product obtained by secondary molding of the same primary molded product. (A) is a sectional view of the connector, and (b) is an enlarged sectional view of a main part of the primary molded product. (A) is a front view of the connector, and (b) is a cross-sectional view along line AA in (a). (A) is a partial cross-sectional view around the hood portion of the connector, (b) is an enlarged cross-sectional view of a portion B in FIG. (A), and (c) is a partial cross-sectional view around the hood portion of the connector of the comparative example. It is. It is sectional drawing which shows the attachment state of the said connector. It is sectional drawing which shows the secondary molding process of the conventional connector.

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

  FIG. 1 is a perspective view showing a connector according to an embodiment of the present invention, FIG. 2 (a) is a perspective view of a primary molded product used in the connector, and FIG. 2 (b) is a secondary molded secondary molded product of the primary molded product. FIG. 3 (a) is a cross-sectional view of a connector, FIG. 3 (b) is an enlarged cross-sectional view of a main part of a primary molded product, and FIG. 4 (a) is a front view of the connector. 4 (b) is a sectional view taken along line AA in FIG. 4 (a), FIG. 5 (a) is a partial sectional view around a hood portion of the connector, and FIG. 5 (b) is FIG. 5 (a). FIG. 5C is an enlarged cross-sectional view of a portion denoted by reference numeral B, FIG. 5C is a partial cross-sectional view around a hood portion of a connector of a comparative example, and FIG. In addition, in each figure, the symbol Y indicates a vertical direction, the symbol X indicates a left-right (horizontal) direction, and the symbol Z indicates a front-back (axial) direction.

  As shown in FIGS. 1, 2 (a), (b), and FIG. 6, the connector 10 is a type of relay connector and is suitable for use as a relay connector for an automatic transmission of an automobile, for example. A primary molded product (preliminary molded product) 21 in which each intermediate portion 20c of the pair of bent terminals 20 and 20 is primarily molded so that each intermediate portion 20c is kept insulated by a block-shaped resin portion 22. And the secondary molding of the primary molded article 21 so that one end 12a of the pair of terminals 20 is accommodated at one end 12a side, and the hood 13 has a hood 13 into which a mating connector (not shown) is fitted. And a second cylindrical portion 14 in which the other end 20b side of the pair of terminals 20, 20 is accommodated in the other end 14b side, and into which another mating connector (not shown) is fitted. A housing 11 as a secondary molded article which integrally as Gall in shape, provided with, constructed by insert molding the primary molded article 21 which is insert a pair of terminals 20 and 20.

  As shown in FIG. 4A, the center line L1 of the first tubular portion 12 of the housing (secondary molded product) 11 is offset from the center line L2 of the second tubular portion 14 by a predetermined amount. The first tubular portion 12 and the second tubular portion 14 are formed integrally with each other in a state of being offset by the predetermined amount. That is, the hood portion 13 of the first cylindrical portion 12 is formed in a vertically long elliptical cylindrical shape, and the bottom 12b side of the first cylindrical portion 12 at the back of the hood portion 13 is formed in a vertically long elliptical column shape. I have. Then, as shown in FIG. 4 (b), on the bottom 12b side of the first cylindrical portion 12, the one end 14a side of the cylindrical second cylindrical portion 14 in the downward direction Y is integrally formed in an L-shape. The primary molded product 21 is insert-molded in one end 14a side of the second cylindrical portion 14.

  As shown in FIGS. 1, 2B and 6, both lower corner portions of the peripheral wall 13 a of the hood portion 13 extend in the front-rear direction (axial direction) Z to the middle of the hood portion 13. It has a pair of cylindrical lightening portions 13b.

  As shown in FIG. 2B, a flange portion 15 including a flange protrusion 23 described later of the primary molded product 21 is protruded in the lateral direction X on one end 14 a side of the second cylindrical portion 14. It is integrally molded. Further, as shown in FIGS. 1 (a), 4 (a) and 6, a seal member is provided below the mounting flange 16 below the flange 15 on the one end 14a side of the second cylindrical portion 14. The mounting groove 17 for assembling the O-ring 18 is formed in an annular concave shape. The O-ring 18 mounted on the annular concave mounting groove 17 seals the mounting hole 31 of the housing 30 of the transmission and the second cylindrical portion 14 of the housing 11. Further, the flange portion 15 protruding in the lateral direction X of the housing 11 in which the mounting flange portion 16 is installed on the housing 30 is fitted and held down in a recess of a peripheral device (not shown) provided on the housing 30. By being fixed (fixed), rotation of the housing 11 is prevented. As shown in FIG. 6, a liquid 32 such as a lubricating oil is contained in the housing 30, and the other end 14 b side of the second cylindrical portion 14 of the housing 11 enters the liquid 32. .

  As shown in FIGS. 2A and 2B and FIGS. 4A and 4B, the pair of terminals 20 and 20 are connected to the first tubular portion 12 and the second tubular portion 14 of the housing 11. Each intermediate portion 20c is formed to be bent at a right angle and in the lateral direction X so as to follow. That is, as shown in FIGS. 2A and 2B, each intermediate portion 20c of the pair of terminals 20, 20 is insert-molded on one side of the resin portion 22, and one end 20a of the pair of terminals 20, 20 is inserted. The other end 20b of the pair of terminals 20, 20 is disposed on the lower surface 22b of the resin portion 22 at a predetermined distance in the front-rear direction Z, while being disposed on the upper surface 22a of the resin portion 22 with a predetermined distance therebetween. Have been. Each terminal 20 is a male relay terminal having one end 20a and the other end 20b formed in a tab shape.

  Further, as shown in FIGS. 2 (a) and 2 (b) and FIGS. 3 (a) and 3 (b), the primary molded product 21 is formed by insert-molding each intermediate portion 20c of the pair of terminals 20 and 20. A rectangular column-shaped flange projecting portion 23 projecting in the lateral direction X is integrally formed with the block-shaped resin portion 22 holding each of the intermediate portions 20c in an insulated state.

  As shown in FIGS. 2A and 2B and FIGS. 3A and 3B, a pair of lightening portions 13b, 13b of the hood portion 13 are provided on the front surface 22c of the block-shaped resin portion 22. Has a pair of protruding portions 24, 24 at positions opposed to. Each of the protrusions 24 is formed in a columnar shape slightly larger than the cylindrical lightening portion 13b, and at the tip of the columnar protrusion 24, a conical concave portion 24a for a cutting die is formed. It is formed. That is, as shown in FIG. 4B and FIGS. 5A and 5B, during the secondary molding, the resin is molded into the conical concave portion 24a at the tip of the cylindrical projection 24 of the resin portion 22. The conical convex portion 51a at the tip of the lightening piece 51 of the mold 50 is held, so that the deflection of the tip of the piece 51 can be suppressed.

  Next, a method of manufacturing the connector 10 in the secondary molding will be described.

  As shown in FIG. 2A, a primary molding having a pair of protrusions 24, 24 projecting in the front-rear direction Z by covering each intermediate portion 20 c of the pair of terminals 20, 20 by insert molding and covering the resin portion 22. The article 21 is injection-molded using a molding die (not shown) (primary molding step).

  Next, as shown in FIG. 5A, a secondary molded product in which the first cylindrical portion 12 and the second cylindrical portion 14 are integrally formed so as to cover the primary molded product 21 molded in the primary molding step. Is formed by injection molding using a molding die 50 (secondary molding step). In this secondary molding step, a pair of lightening portions 13b, 13b extending in the axial direction Z so as to face the pair of projecting portions 24, 24 of the primary molded product 21 are formed on the hood portion 13 of the first cylindrical portion 12. It is formed on the peripheral wall 13a.

  At the time of the secondary molding in which the primary molded article 21 is insert-molded to form the housing 11 as a secondary molded article, like the connector 10 ′ of a comparative example shown in FIG. When the lightening portion 13b 'is formed long with the lightening piece 51 of the molding die 50 as long as the lightening portion 13b' is extended to the bottom portion 12b side of the first cylindrical portion 12, a cylindrical piece is formed by the pressure of the resin (the injection pressure of the molten resin). 5A and 5B, a molding defect such as a hole is formed in the frontage of the hood portion 13 or the peripheral wall 13a. In this embodiment, as shown in FIGS. The conical convex part 51a at the tip of the lightening piece 51 of the molding die 50 is held in the conical concave part 24a at the tip of the cylindrical protruding part 24 of the resin portion 22 of the resin part 22. It is possible to reduce the load on the piece 51 by suppressing the deflection on the tip side of Can be, receptacle such as a hole in the frontage or wall 13a of 13 molding defects can be prevented from occurring.

  As described above, the peripheral wall 13a of the hood portion 13 of the housing 11 has the cylindrical lightening portion 13b in the front-rear direction Z, and the primary molded product 21 has a cylindrical protrusion at a position facing the lightening portion 13b. Since it has 24, the molding accuracy of the frontage of the hood portion 13 of the housing 11 can be improved, and molding defects can be reduced.

  Further, in the case of the secondary molding of the connector 10 ′ of the comparative example shown in FIG. 5C, when removing the housing 11, which is a secondary molded product, from the molding die 50, the frontage of the hood portion 13 of the housing 11. Since there is nothing to support the frontage, the frontage collapses, and the frontage collapse of the hood portion 13 causes the occurrence of the galling failure in the frontage, and the piece 51 for lightening does not come off smoothly, and the piece 51 breaks. Although a defect occurs, in this embodiment, as shown in FIGS. 5A and 5B, the cylindrical protrusion 24 of the resin portion 22 formed of the primary molded product 21 is In order to support the peripheral wall 13a, when the housing 11 is taken out of the molding die 50, it is possible to prevent the front end of the hood portion 13 from collapsing, to prevent the occurrence of a galling failure in the frontage, and to generate the broken piece 51. Can be prevented. Further, the length of the lightening portion 13b formed in the front-rear direction Z on the peripheral wall 13a of the hood portion 13 can be reduced as much as possible by the cylindrical protrusion 24 of the resin portion 22 of the primary molded article 21. .

  Furthermore, the length of each of the lightening pieces 51 can be reduced by the length of the columnar protruding portion 24 of the resin portion 22 formed by the primary molded product 21, so that the die cost can be reduced. In addition, the housing 11 can be manufactured with high precision in a shape as shown in the design drawing, without the lightening pieces 51 swinging or breaking due to the pressure of the resin.

  According to the above-described embodiment, the primary molded product is formed by primary molding the pair of terminals. However, the primary molded product may be formed by primary molding two or more terminals. .

10 Connector 11 Housing (Secondary molded product)
12 First cylindrical part 12a One end 13 Hood part 13a Peripheral wall 13b Lightening part 14 Second cylindrical part 14b Other end 20, 20 A pair of terminals 20a One end 20b Other end 20c Intermediate part 21 Primary molded product 22 Resin part 24 Projecting part 24a Conical concave portion 51 Lightening piece (cutting die) for forming die
Z front and rear direction (axial direction)

Claims (3)

A primary molded product in which each intermediate portion of the at least one pair of terminals formed by bending is primarily formed, and each intermediate portion is kept in an insulated state by a resin portion.
The first molded article is secondarily molded so that one end of each of the pair of terminals is housed at one end and a bottomed first cylindrical portion having a hood portion with which a mating connector is fitted, and the other end. And a housing as a secondary molded product integrally having a second tubular portion in which the other end of the pair of terminals is housed, and a second cylindrical portion into which another mating connector is fitted. ,
The peripheral wall of the hood portion has a lightening portion in the axial direction,
The said primary molded article has a protrusion part in the position facing the said lightening part, The connector characterized by the above-mentioned. The connector according to claim 1, wherein
The protrusion is formed in a cylindrical shape,
A connector, wherein a conical concave portion for a punching die is formed at a tip of the cylindrical protruding portion. By primary molding each intermediate portion of at least a pair of terminals formed by bending, each intermediate portion forms a primary molded product in which an insulating state is maintained by a resin portion,
The first molded article is secondarily molded so that one end of each of the pair of terminals is housed at one end and a bottomed first cylindrical portion having a hood portion with which a mating connector is fitted, and the other end. And a second cylindrical part in which the other end of the pair of terminals is housed, and a second cylindrical part into which another mating connector is fitted. hand,
A primary molding step of covering each intermediate portion of the pair of terminals with the resin portion and molding the primary molded product having a protruding portion projecting in an axial direction;
A secondary molding step of integrally molding the first cylindrical portion and the second cylindrical portion so as to cover the primary molded product molded in the primary molding step,
In the secondary molding step,
A method for manufacturing a connector, comprising: forming a lightening portion extending in an axial direction on a peripheral wall of the hood portion so as to face the projecting portion of the primary molded product.

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