JP2016129088A - connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connector which enables improvement of holding power of a terminal fitting.SOLUTION: A connector includes: a terminal fitting 10 connected to a terminal part of an electric wire W; and a housing 20 housing the terminal fitting 10. The terminal fitting 10 has a cylindrical body part 13. The body part 13 is provided with a lance engagement part 18 with which a resin lance 24 provided in the housing 20 may engage from a rear side. A relief part 19 retreated to a front side relative to an inner edge part 18U of the lance engagement part 18, which is positioned at an inner peripheral surface side of the body part 13, is provided at an outer edge part 18S of the lance engagement part 18 which is positioned at an outer peripheral surface side of the body part 13. A retainer 27 which limits elastic displacement of the resin lance 24 in an engagement release direction is attached to the housing 20.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a connector.

  Conventionally, there is known a connector in which a terminal fitting connected to a terminal portion of an electric wire is accommodated in a housing. The terminal fitting accommodated in the housing is locked by a resin lance provided in the housing and is prevented from coming off. For example, in the connector described in Patent Document 1 below, a lance locking surface on which a resin lance is locked from the rear is provided at the rear end of the rectangular tube portion of the terminal fitting. When the electric wire is pulled with a strong force, the corner of the outer edge of the lance locking surface (the edge on the outer peripheral surface side of the square tube portion) is caught by the resin lance so that the locked state of the resin lance is maintained. It has become. Thereby, the holding power of the terminal fitting of the connector is enhanced.

JP 2003-272744 A

  However, in the configuration as described above, stress concentrates on the portion of the resin lance where the outer edge of the lance locking surface is hooked. Therefore, if the wire is pulled with a very strong force, the resin lance may be destroyed. . For this reason, it has been desired to improve the holding power of the terminal metal fitting by preventing stress concentration on the resin lance.

  This invention is completed based on the above situations, Comprising: It aims at providing the connector which can improve the retention strength of a terminal metal fitting.

  The connector of the present invention includes a terminal fitting connected to a terminal portion of an electric wire, and a housing in which the terminal fitting is accommodated, and the terminal fitting has a cylindrical main body, and the main body includes A lance locking portion capable of locking the resin lance provided in the housing from the rear is provided, and the lance locking portion is provided on an outer edge portion of the lance locking portion located on the outer peripheral surface side of the main body portion. A relief portion retracted forward from an inner edge located on the inner peripheral surface side of the main body portion is provided, and the housing has a retainer for restricting elastic displacement in the unlocking direction of the resin lance. It is installed.

  According to the present invention, since the relief portion is provided on the outer edge portion of the lance locking portion, it is possible to prevent stress from concentrating on the resin lance, and the retainer in the unlocking direction of the resin lance. Since the elastic displacement is limited, the holding force of the terminal fitting can be improved.

It is a terminal metal fitting in a present Example, Comprising: The top view which shows the state connected to the terminal part of an electric wire Sectional view showing connector Partially enlarged sectional view of the connector showing a state where the resin lance is locked to the lance locking portion.

Preferred embodiments of the present invention are shown below.
In the connector according to the present invention, the relief portion may be provided in a minimum range in accordance with a width dimension of the resin lance in the lance locking portion. According to such a configuration, the escape portion can be formed by a minimum necessary processing.

In the connector according to the present invention, the escape portion may be formed by hitting the outer edge portion.
In the connector of the present invention, the lance locking portion may be formed by punching from the inner peripheral surface side to the outer peripheral surface side.

<Example>
Hereinafter, an embodiment embodying the present invention will be described in detail with reference to FIGS.
The connector C in the present embodiment includes a terminal fitting 10 connected to the terminal portion of the electric wire W and a housing 20 in which the terminal fitting 10 is accommodated. The terminal fitting 10 is a male terminal fitting that is connected to a female terminal fitting provided in the mating connector when the connector C is fitted to a mating connector (not shown). Hereinafter, in each component, the left side (fitting surface side with the mating connector) in FIG.

  The housing 20 is made of a synthetic resin, and includes a terminal accommodating portion 21 having a block shape in which the terminal fitting 10 is accommodated, and a cylindrical hood portion 22 that surrounds the outer periphery of the terminal accommodating portion 21 and protrudes forward. It has.

  The terminal accommodating portion 21 is provided with a plurality of cavities 23 in which the terminal fittings 10 are individually accommodated. The cavities 23 are provided in two upper and lower tiers, and a pair of cavities are arranged in each row in the width direction.

  A resin lance 24 is formed on the wall surface of each cavity 23 so as to protrude forward. The resin lance 24 is provided on the partition wall 25 between the upper and lower cavities 23, that is, on the lower wall in the upper cavity 23 and on the upper wall in the lower cavity 23.

  The resin lance 24 includes an extending portion 24A that extends in a cantilevered manner from the partition wall 25, and a locking protrusion 24B that protrudes from the upper surface or the lower surface of the extending portion 24A. The resin lance 24 can be elastically bent in the vertical direction with the base portion (rear end portion) of the extending portion 24A as a fulcrum.

  The locking projection 24B is provided at the intermediate portion in the front-rear direction of the extension 24A. The front surface of the locking projection 24 </ b> B is a locking surface 26 that intersects the insertion direction of the terminal fitting 10 at a substantially right angle. The height dimension of the locking surface 26 (the protruding dimension of the locking projection 24B) is the same as the plate thickness dimension of the two metal plate materials constituting the terminal fitting 10.

  The hood part 22 is provided at a predetermined interval from the terminal accommodating part 21, and projects forward from the terminal accommodating part 21. The mating connector is fitted inside the hood portion 22 and on the front side of the terminal accommodating portion 21.

  The housing 20 is provided with a retainer 27 that restricts the elastic displacement of the resin lance 24 in the unlocking direction (elastic displacement toward the bending space S). The retainer 27 is a front retainer that is formed separately from the terminal accommodating portion 21 and is attached to the front side of the terminal accommodating portion 21.

  The retainer 27 is made of a synthetic resin, has a cap shape as a whole, and has a bending restricting portion 28 that can enter the bending space S of the resin lance 24 from the front. The bending restriction portion 28 fills the bending space S and restricts the elastic displacement of the resin lance 24 in the unlocking direction.

  When the terminal fitting 10 connected to the terminal portion of the electric wire W is inserted into the cavity 23 from the rear side, the terminal fitting 10 pushes the locking projection 24B of the resin lance 24 and flexes the resin lance 24 elastically into the space S, When the terminal fitting 10 reaches the proper position, the resin lance 24 is elastically restored and the locking projection 24B is fitted into the lance hole 17 of the terminal fitting 10. As a result, the terminal fitting 10 is temporarily prevented from coming off by the resin lance 24. Thereafter, the displacement of the resin lance 24 in the unlocking direction is restricted by the deflection restricting portion 28 of the retainer 27 attached to the housing 20, and the terminal fitting 10 is secondarily prevented from coming off.

The terminal fitting 10 is integrally formed by bending a conductive metal plate material or the like, and has an elongated shape in the front-rear direction as a whole. The rear end portion of the terminal fitting 10 is provided with a wire connecting portion 11 connected to the terminal portion of the electric wire W, and the front end portion is a flat plate-like tab portion connected in contact with the mating terminal fitting. 12 is provided. And the main-body part 13 which connects between the electric wire connection part 11 and the tab part 12 is provided in the intermediate part of the front-back direction of the terminal metal fitting 10. As shown in FIG.
The electric wire connecting portion 11 has an open barrel shape to which a terminal portion of the electric wire W is crimped, and has a pair of barrel pieces 11A protruding from both side edges of the bottom plate 14 (see FIG. 1).

  The main body 13 has a cylindrical shape, and includes a bottom plate 14, a pair of side plates 15 rising from both side edges thereof, and a ceiling plate 16 that is bent substantially at right angles from the rising ends of the side plates 15 and arranged substantially parallel to the bottom plate 14. Have. Note that the bottom plate 14 extends rearward until reaching the wire connection portion 11.

  As shown in FIG. 3, the ceiling plate 16 has a form in which two metal plates are stacked on the front end portion of the main body portion 13. A lance hole 17 into which the locking projection 24 </ b> B of the resin lance 24 can be fitted is formed at an intermediate portion in the front-rear direction of the ceiling plate 16. The lance hole 17 is formed by partially cutting and raising the ceiling plate 16. A portion folded back to form the lance hole 17 is inclined obliquely rearward from the ceiling plate 16 inside the main body 13, and a tip thereof is arranged in contact with or close to the bottom plate 14.

  The lance hole 17 penetrates the ceiling plate 16 in a slightly long rectangular shape in the front-rear direction that is large enough to allow the locking projection 24B of the resin lance 24 to enter. And the edge part of the front side among the peripheral parts of the lance hole 17 is made into the lance latching | locking part 18 which the resin lance 24 can latch from back.

  As shown in FIG. 3, the outer edge 18 </ b> S located on the outer peripheral surface side of the main body portion 13 in the lance locking portion 18 is an inner edge located on the inner peripheral surface side of the main body portion 13 in the lance locking portion 18. The escape portion 19 is retracted forward from the portion 18U. The escape portion 19 is an inclined tapered surface having a shape in which a corner portion outside the lance locking portion 18 is cut off.

  The escape portion 19 is provided in a minimum range in accordance with the width dimension of the resin lance 24 in the lance locking portion 18. Specifically, the escape portions 19 are not formed at both ends of the entire width of the lance hole 17, but are arranged at the central portion (the bent portion 17 </ b> K between the ceiling plate 16 and the side plate 15 and the rounded portion of the corner portion of the lance hole 17. 17M) (see FIG. 1).

  The lance locking portion 18 is formed by punching from the inner peripheral surface side to the outer peripheral surface side, and the escape portion 19 is formed by hitting the outer edge portion 18S of the lance locking portion 18. By forming the escape portion 19, the corner portion of the outer edge portion 18S has a chamfered shape. The punching direction of the lance locking portion 18 may be any direction.

Next, an experimental result of measuring the holding force of the terminal fitting 10 in the connector C of this embodiment will be described.
In this experiment, each holding force using a terminal fitting in which the relief portion 19 is not formed in the lance locking portion 18 (hereinafter referred to as a conventional terminal fitting) and the terminal fitting 10 in which the relief portion 19 is formed. Was measured. Specifically, the conventional terminal fitting or terminal fitting 10 connected to the terminal portion of the electric wire W is accommodated in the housing 20, and the electric wire W is moved at a constant speed (50 mm in this embodiment) with the retainer 27 attached to the housing 20. / Min), and the experiment was conducted a plurality of times to read the load when the conventional terminal fitting or terminal fitting 10 was pulled out.

  The experimental results were as follows. As for the holding force of the conventional terminal fitting, the minimum value was 80.2N, the maximum value was 95.2N, and the average value (arithmetic mean) was 86.9N. On the other hand, the holding force of the terminal fitting 10 was 94.8N for the minimum value, 107.0N for the maximum value, and 98.6N for the average value. From this experimental result, it was confirmed that the holding force of the terminal fitting 10 was remarkably (about 10 N) higher than the holding force of the conventional terminal fitting.

  It should be noted that when the conventional terminal fittings were pulled out of the housing 20, many forms of destruction were observed, such as a portion of the resin lance 24 being cut off cleanly. On the other hand, when the terminal fitting 10 is pulled out from the housing 20, a part of the resin lance 24 is not cut off as in the case of the conventional terminal fitting, but remains in a largely deformed state. Many were seen.

Next, operations and effects of the embodiment configured as described above will be described.
The connector C of the present embodiment includes a terminal fitting 10 connected to the terminal portion of the electric wire W and a housing 20 in which the terminal fitting 10 is accommodated, and the terminal fitting 10 has a cylindrical main body portion 13. The main body portion 13 is provided with a lance locking portion 18 that can be locked from the rear with a resin lance 24 provided on the housing 20. The portion 18S is provided with a relief portion 19 that is retracted forward from the inner edge portion 18U located on the inner peripheral surface side of the main body portion 13 of the lance locking portion 18, and the housing 20 is engaged with the resin lance 24. A retainer 27 is mounted to limit the elastic displacement in the stop release direction.

  According to this configuration, the relief portion 19 is provided on the outer edge 18 </ b> S of the lance locking portion 18, whereby stress can be prevented from concentrating on the resin lance 24, and the resin lance 24 can be prevented by the retainer 27. Therefore, the holding force of the terminal fitting 10 can be improved.

  Further, the relief portion 19 is provided in a minimum range in accordance with the width dimension of the resin lance 24 in the lance locking portion 18. According to this configuration, the escape portion 19 can be formed by the minimum necessary processing.

<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) In the above embodiment, the case where the lance hole 17 is provided in the main body portion 13 of the terminal fitting 10 and the front edge portion thereof is the lance locking portion 18 is described, but the present invention is not limited to this. For example, the present invention can also be applied to a terminal fitting in which the lance hole is not provided in the main body portion of the terminal fitting and the rear end of the main body portion is a lance locking portion.
(2) In the above embodiment, the case where the terminal fitting 10 is a male terminal fitting has been described. However, the present invention is not limited to this, and the present invention can also be applied to a female terminal fitting.
(3) In the above embodiment, the escape portion 19 is formed in the central portion excluding both end portions of the entire width of the lance locking portion 18. You may form at intervals in several places.

C ... Connector W ... Electric wire 10 ... Terminal metal fitting 13 ... Main body 18 ... Lance locking part 18S ... Outer edge 18U ... Inner edge 19 ... Relief 20 ... Housing 24 ... Resin lance 27 ... Retainer

Claims (4)

A terminal fitting connected to the end of the wire;
A housing in which the terminal fitting is accommodated,
The terminal fitting has a cylindrical main body portion, and the main body portion is provided with a lance locking portion capable of locking a resin lance provided in the housing from the rear,
Out of the lance locking portion, the outer edge portion located on the outer peripheral surface side of the main body portion is retracted further forward than the inner edge portion of the lance locking portion positioned on the inner peripheral surface side of the main body portion. There is a relief,
The housing is provided with a retainer for restricting the elastic displacement of the resin lance in the unlocking direction.   The connector according to claim 1, wherein the relief portion is provided in a minimum range in accordance with a width dimension of the resin lance in the lance locking portion.   The connector according to claim 1, wherein the relief portion is formed by hitting the outer edge portion.   The connector according to any one of claims 1 to 3, wherein the lance locking portion is formed by punching from the inner peripheral surface side to the outer peripheral surface side.

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