JP2013069538A - Connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a force for holding a terminal fitting while restraining an insertion force.SOLUTION: A cavity 22 in which a terminal fitting 10 is inserted is provided in a housing 20, and a lance 30 is provided on one wall of the cavity 22. The lance 30 comprises a lance body 31 extending in an insertion direction of the terminal fitting 10, and a locking projection part 35 provided at a tip part 31B of the lance body 31. As the terminal fitting 10 is inserted in the cavity 22 to a regular position, the lance 30 is elastically recovered, and the locking projection part 35 is locked with a locked part 15 of the terminal fitting 10 so as to prevent detachment. The locking projection part 35 is formed wider than a base part 31A of the lance body 31 of the lance 30, and a receiving part 40 that can receive the terminal fitting 10 regularly inserted when the lance 30 is elastically recovered is formed to project on a tip face 31C of the lance body 31.

Description

  The present invention relates to a connector provided with a lance that is locked to a terminal fitting in a cavity of a housing to prevent the housing from coming off.

  Conventionally, what was described in patent document 1 is known as an example of this kind of connector. This is provided with a cavity into which the terminal fitting is inserted in the housing, and a lance provided with a locking projection at the tip is provided in a cantilever shape facing the insertion direction of the terminal fitting on one wall surface of this cavity. The terminal fitting is inserted into the cavity while elastically deflecting the lance, and when the lance is inserted to the proper position, the lance is elastically restored and the locking protrusion at the tip is fitted into the lance hole of the terminal fitting. To prevent it from coming off.

Japanese Patent No. 2634528

This type of lance mainly functions to lock the terminal fitting and prevent it from coming off when the wire is pulled. However, if the pulling force becomes excessive, the terminal is locked against the locking protrusion. There is a possibility that an excessive shearing force along the pulling direction of the metal fitting acts to cause damage. In order to cope with a large shear force, it is effective to widen the lance and increase the shear area. However, when the lance is widened, the rigidity of the root portion of the lance, which is the fulcrum of elastic deflection, also increases. A large force is required to bend the lance, that is, it cannot be simply dealt with because the terminal insertion force increases.
The present invention has been completed based on the above circumstances, and an object of the present invention is to improve the holding force for the terminal fitting while suppressing the insertion force.

  According to the present invention, a cavity into which a terminal fitting is inserted is provided in the housing, and a lance is provided on one wall surface of the cavity. The lance is formed to extend along the insertion direction of the terminal fitting. And a locking projection provided at the tip of the lance body. In the process of inserting the terminal fitting into the cavity, the lance is elastically bent due to interference with the terminal fitting, and the terminal fitting. In the connector in which the lance is elastically restored by being inserted to the normal position and the locking protrusion is locked to the locked portion of the terminal metal fitting to prevent the lance from being removed. The locking projection is formed wider than the base portion of the main body, and the front end surface of the lance main body is properly inserted when the lance is elastically restored. It has a feature where the receiving unit capable of receiving the terminal fitting is formed to project.

  The holding force with respect to the terminal fitting can be improved by increasing the shearing area by widening the locking projection. On the other hand, since the base portion of the lance body is kept narrow, the lance can be flexibly secured, the insertion force of the terminal fitting can be kept small, and the insertion workability can be improved. In addition, as the terminal fitting is properly inserted and the lance is elastically restored, the terminal fitting is received by the receiving portion provided on the front end surface of the lance main body, so that the terminal fitting can be housed in a stable posture in the cavity. it can.

The following configuration may also be used.
(1) Between the said base part of the said lance main body, and the said latching protrusion, the taper part which becomes gradually wide toward the front end side is interposed.
The narrow portion on the base side and the wide portion on the locking projection side are smoothly connected without any step, and stress concentration at the connecting portion is avoided, which is effective in preventing damage.

(2) The terminal fitting is provided with a rectangular tube-shaped terminal body that is fitted almost tightly into the cavity, and the rear edge of the terminal body facing the lance is the locked portion. The pair of receiving portions provided on the lance receive the left and right side edges on the facing surface of the terminal body.
When the locked portion is the rear edge of the terminal body facing the lance, for example, compared to the case where the locked portion is a lance hole, the locking protrusion of the lance can be easily widened and higher. A holding force can be obtained.

  According to the present invention, it is possible to increase the holding force against disconnection while suppressing the insertion force of the terminal fitting, and it is possible to accommodate the terminal fitting in a stable posture in the cavity.

The perspective view of the female terminal metal fitting which concerns on one Embodiment of this invention. Perspective view of male housing Front view Rear view Same part cutaway perspective view Partial cutaway plan view of female housing and bottom view of female terminal fitting Perspective view from the back side of the lance Perspective view seen from the front side Bottom view 9 is a longitudinal sectional view taken along line XX in FIG. 9 showing the insertion operation of the female terminal fitting. Longitudinal sectional view showing the insertion of female terminal fittings Longitudinal section with the female terminal fitting inserted to the proper position Longitudinal sectional view with the lance forcibly elastically deformed

<Embodiment>
An embodiment of the present invention will be described with reference to FIGS.
In this embodiment, the female connector is illustrated, and the female terminal fitting 10 connected to the end of the electric wire W is prevented from coming into the cavity 22 provided in the female housing 20 (hereinafter, female housing 20). It is comprised by being accommodated.

The female terminal fitting 10 is formed by pressing a metal plate excellent in electrical conductivity. As shown in FIG. 1, a wire barrel 13 is provided behind a terminal connecting portion 11 having a slightly flat rectangular tube shape. And the insulation barrel 14 are connected to each other, and an elastic contact piece 12 is provided in the terminal connection portion 11.
As shown in FIG. 10, the female terminal fitting 10 is fixed to the end of the electric wire W by crimping and crimping the wire barrel 13 to the end of the core wire of the electric wire W and the insulation barrel 14 to the end of the insulation coating. It is connected.

A tab of the other male terminal fitting (not shown) is inserted into the terminal connecting portion 11 of the female terminal fitting 10 from the front, and is elastically sandwiched between the bottom plate 11A of the terminal connecting portion 11 facing the elastic contact piece 12. As a result, an electrical connection is established.
Further, the rear edge portion of the ceiling plate 11B in the terminal connection portion 11 is a locked portion 15 that is locked to a lance 30 provided in the cavity 22 of the female housing 20, as will be described in detail later.

  Next, the structure of the female housing 20 will be described. The female housing 20 is made of synthetic resin, and is formed in a slightly flat block shape as a whole as shown in FIGS. The front surface of the female housing 20 (the surface on the near side in FIG. 2) is a mating surface when mated with a mating male housing (not shown). Is provided with a lock arm 21 that locks the two in a fitted state.

In the female housing 20, ten cavities 22 in which the above-described female terminal fittings 10 are inserted and accommodated from the rear are formed in a line of five in two upper and lower stages.
As shown in FIG. 10, the cavity 22 has a horizontally-long rectangular cross section in which the front half region 23 </ b> A (hereinafter referred to as the front region 23 </ b> A) fits tightly with the terminal connection portion 11 of the female terminal fitting 10. The remaining rear region 23B has a cross-sectional shape in which the lower side further expands, and the entire rear end surface is open.

  A front wall 25 is formed at the upper position of the front end surface of the cavity 22 so as to stop in front of the terminal connection portion 11 of the inserted female terminal fitting 10. The mating male terminal fitting is formed on the front wall 25. A terminal insertion opening 26 into which the tabs can be inserted is opened. An opening groove 25 </ b> A is cut out at the center width position of the lower edge portion of the terminal insertion opening 26 in the front wall 25.

The front end portion of the cavity 22, more specifically, the left and right side walls 22 </ b> A immediately after the front wall 25, is a height position that is lowered from the ceiling wall 22 </ b> B by a dimension comparable to the height of the terminal connection portion 11 of the female terminal fitting 10. In FIG. 2, a pair of terminal receiving portions 27 are formed to protrude. Both terminal receiving portions 27 are formed with an interval comparable to the width of the above-described opening groove 25A.
Therefore, when the female terminal fitting 10 is inserted into the cavity 22 from the rear side, the front end edge of the terminal connection portion 11 is stopped by hitting the front wall 25, and the left and right side edge portions on the front end side of the terminal connection portion 11 are also combined. Is received by the left and right terminal receiving portions 27.

In the front region 23A of each cavity 22, the bottom surface is opened, but a lance 30 that is locked to the female terminal fitting 10 to prevent it from coming off is formed at a position on the rear side of the bottom surface.
As shown in FIGS. 7, 8, and 10, the lance 30 has a lance main body 31 that extends forward from a bottom wall 22 </ b> C of the cavity 22 and then extends forward. The lance body 31 is formed with a narrow width about the base portion 31A (an area of a little less than half of the entire length), such as a little more than half the width of the front area 23A of the cavity 22, whereas the tip portion 31B is more than the base portion 31A. It is formed to have a predetermined width that is wide (about 1.5 times the base portion 31A). More specifically, the tip portion 31B is formed with a width wider than the distance between the pair of left and right terminal receiving portions 27 described above. The side surface of the narrow base portion 31A and the side surface of the wide tip portion 31B are connected via a tapered surface 32 that is widened in two steps toward the front.

With respect to the height position of the upper surface of the lance body 31, the upper surface of the base portion 31A is a horizontal surface at a height corresponding to the bottom surface of the front region 23A of the cavity 22, and the tip portion 31B has a slightly upward slope. The upper surface is a horizontal surface that is one step higher. Further, a short ridge 33 having the same width as the base portion 31A is formed from the front edge of the upper surface of the base portion 31A to the center portion in the width direction of the upper surface of the tip portion 31B.
As a result, a locking protrusion 35 that locks to the locked portion 15 of the female terminal fitting 10 is formed by a substantially upper half of the tip portion 31B of the lance main body 31, more specifically, a portion above the upper surface of the base portion 31A. Has been. The locking projection 35 has a convex shape with a central width portion increased in a front view, and at least in the lower half region of the locking projection 35, as compared with the root portion 31A of the lance body 31, as described above. It is about 5 times wider.

Since the tip 31B of the lance body 31 is formed wide as described above, it protrudes from both ends of the lower half region of the tip surface 31C of the lance body 31 and the left and right side walls 22A of the front end of the cavity 22. The protruding side of the provided terminal receiving portion 27 is overlapped in the width direction. A flexible piece having an elongated rectangular bar shape between the rear surfaces of the protruding portions of the left and right terminal receiving portions 27 and the left and right end portions of the lower region of the distal end surface 31C of the lance main body 31 in this overlapping relationship. 40 is handed over and connected.
Both the flexible pieces 40 are arranged in parallel with each other at a predetermined interval. In a natural state, the upper surface of the flexible piece 40 is a horizontal plane flush with the upper surface of the terminal receiving portion 27.

The lance 30 having the shape as described above has a so-called dual-support type in which the base portion 31 </ b> A of the lance main body 31 and the tips of both flexible pieces 40 are fixed to the inner surface of the cavity 22. As shown in FIG. 11, the lance body 31 and the flexible pieces 40 are elastically bent into an arc shape that bulges downward as a whole, with the front and rear fixed portions as fulcrums, respectively, and the locking protrusions accordingly. 35 is moved downward.
Therefore, a lower region of the lance 30 including the flexible piece 40 is a bending space 42 that allows the lance 30 including the flexible piece 40 to be bent and deformed.

In order to release the locking of the female terminal fitting 10 by the lance 30, the lance 30 is forcibly elastically bent by a release jig J (see FIG. 13).
Therefore, in the lower region of the tip surface 31C of the lance main body 31 described above, a release portion 45 on which the tip of the release jig J can be placed is formed so as to protrude toward the front side at the center width position. The formation position of the release portion 45 is set independently at a position different from the drawing position of both the flexible pieces 40 described above.
A region below the region between the left and right flexible pieces 40 opens to the front surface, and thus a jig insertion space 47 is formed on the front side of the release portion 45. The upper surface 45A of the release portion 45 is an inclined surface having a downward slope toward the front side so that the tip of the release jig J can be guided.

Then, the effect | action of this embodiment is demonstrated.
The female terminal fitting 10 connected to the terminal of the electric wire W according to the above-described procedure takes the posture of being inverted upside down, and then, as shown in FIGS. 6 and 10, in the cavity 22 formed in the female housing 20. Is inserted from behind. In the female terminal fitting 10, the terminal connection portion 11 rides on the upper surface of the locking projection 35 from the upper surface of the root portion 31 </ b> A of the lance 30, and the lance 30 is bent toward the bending space 42 with the flexible piece 40 as shown in FIG. 11. It is pushed in while elastically bending.

When the female terminal fitting 10 is pushed in until it comes into contact with the front wall 25, as shown in FIG. 12, the locked portion 15 at the rear edge of the terminal connecting portion 11 of the female terminal fitting 10 pushes the locking projection 35 of the lance 30. In order to pass, the lance 30 with the flexible piece 40 is elastically restored, and the locking projection 35 is locked to the locked portion 15 of the female terminal fitting 10 and is prevented from coming off. At the same time, the left and right side edge portions of the terminal connection portion 11 of the female terminal fitting 10 are received by the flexible piece 40 from the terminal receiving portion 27 over the entire length, and the female terminal fitting 10 is not bent forward or the like. The horizontal posture is taken in 22 and is stably held.
The assembly of the female connector is completed when the female terminal fitting 10 is retained and accommodated in all the cavities 22 in the same manner as described above.

Such a female connector is similarly fitted with a male connector in which a male terminal fitting is attached to the male housing, and a tab of each male terminal fitting enters the cavity 22 of the female housing 20 from the terminal insertion port 26. And by inserting in the terminal connection part 11 of the female terminal metal fitting 10 accommodated in the cavity 22, the corresponding female terminal metal fitting 10 and male terminal metal fittings are connected.
In this state, when the electric wire W drawn to the rear surface side of the female connector is pulled, the locked portion 15 of the female terminal fitting 10 is locked to the locking protrusion 35 of the lance 30 and is prevented from coming off. Here, since the locking projection 35 is formed wide and has a large shear area, a large holding force against shear fracture can be obtained.

When the female terminal fitting 10 is removed from the cavity 22 of the female housing 20 for maintenance or the like, the release jig J is inserted from the front into the jig insertion space 47 formed between the left and right flexible pieces 40, and the tip thereof Is placed on the release portion 45 projecting from the distal end surface 31C of the lance main body 31 and pushed down, the lance 30 and the flexible piece 40 are elastically deflected toward the bending space 42, so that the female by the locking projection 35 is obtained. The locking of the terminal fitting 10 with respect to the locked portion 15 is released.
Then, by pulling the electric wire W backward, the female terminal fitting 10 can be pulled out behind the cavity 22.

  As described above, according to the present embodiment, the retaining protrusion 35 provided at the tip 31B of the lance body 31 is formed wide to increase the shear area, thereby improving the holding force for the female terminal fitting 10. Can be made. On the other hand, since the base portion 31A of the lance body 31 is kept narrow, the lance 30 can be flexibly secured, the insertion force of the female terminal fitting 10 can be kept small, and the insertion workability can be improved. Further, as the female terminal fitting 10 is properly inserted and the lance 30 is elastically restored, the left and right sides of the terminal connecting portion 11 of the female terminal fitting 10 are formed by the flexible pieces 40 protruding from the distal end surface 31C of the lance main body 31. The edge portion is received, and the female terminal fitting 10 can be accommodated in the cavity 22 in a stable posture.

The narrow portion of the base portion 31A of the lance main body 31 and the wide portion on the side of the locking projection 35 are smoothly connected without a step through the tapered surface 32, and stress concentration at the connecting portion is avoided. Effective for preventing damage.
Moreover, in this embodiment, since the to-be-latched part 15 of the female terminal metal fitting 10 which the lance 30 latches was set to the rear edge of the terminal connection part 11, it compares with the case where a to-be-latched part is a lance hole, for example. Then, the locking projection 35 of the lance 30 can be easily widened, and a higher holding force can be obtained.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) The receiving portion of the terminal fitting provided on the distal end surface of the lance is not limited to the flexible piece illustrated in the above embodiment, but a pair of distal ends that are free ends from, for example, both end portions in the width direction of the distal end surface. The receiving piece may be formed to protrude, or the receiving plate may be formed to protrude from the entire width of the tip surface.
(2) The locking protrusion side and the root side of the lance may be stepped and have different widths.

(3) The lance may be of a type in which the locking projection is fitted and locked in a lance hole opened on one surface of the terminal connection portion of the female terminal fitting.
(4) In the above embodiment, a dual-support lance is illustrated, but the present invention can also be applied to a cantilever lance.
(5) The present invention can be similarly applied to a male connector in which a male terminal fitting is accommodated in a male housing.

10 ... Female terminal fitting (terminal fitting)
11 ... Terminal connection (terminal body)
11B ... Ceiling board (opposite surface to lance)
15 ... Locked portion 20 ... Female housing (housing)
22 ... Cavity 22C ... Bottom wall (one wall of the cavity)
DESCRIPTION OF SYMBOLS 30 ... Lance 31 ... Lance main body 31A ... Root part (of the lance main body 31) 31B ... Tip part (of the lance main body 31) 31C ... Tip end surface (of the lance main body 31) 32 ... Taper surface
35 ... Locking protrusion 40 ... Flexible piece (receiving part)
42 ... Deflection space

Claims (3)

A cavity into which the terminal fitting is inserted is provided in the housing, and a lance is provided on one wall surface of the cavity. The lance is the same as the lance main body extending in the insertion direction of the terminal fitting. It consists of a locking projection provided at the tip of the lance body,
In the process of inserting the terminal fitting into the cavity, the lance is elastically bent due to interference with the terminal fitting, and the lance is elastically restored as the terminal fitting is inserted to a normal position, so that the locking projection In the connector in which the part is prevented from coming off by being locked to the locked part of the terminal fitting,
The locking projection is formed wider than the base of the lance body in the lance,
In addition, the connector is characterized in that a receiving portion that can receive the terminal fitting that is normally inserted when the lance is elastically restored is projected from the front end surface of the lance body. The connector according to claim 1, wherein a taper portion that gradually becomes wider toward a tip end side is interposed between the root portion of the lance main body and the locking projection. The terminal fitting includes a rectangular tube-shaped terminal body that is fitted almost tightly into the cavity, and a rear edge of a surface of the terminal body that faces the lance is the locked portion. The connector according to claim 1 or 2, wherein the pair of receiving portions provided on the left and right sides of the terminal main body receive left and right side edges.

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