JP3362837B2 - Barrel structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a barrel portion crimped on a shield layer of a shielded electric wire.

[0002]

2. Description of the Related Art FIG. 8 shows a structure of a barrel of a terminal fitting disclosed in Japanese Utility Model Laid-Open No. 5-27983 as an example of the structure of a conventional barrel. At the rear end of the terminal fitting 1, a pair of barrel portions 1b and 1c are provided side by side in the front-rear direction. Then, the first barrel portion 1b on the front side plays a role of being caulked to the outside of the shield layer 2a exposed at the end portion of the shielded electric wire 2 and electrically connected to the shield layer 2a, and the second barrel portion 1c on the rear side. Is a shielded wire 2
The outer sheath 2b serves to hold the terminal fitting 1 on the shielded electric wire 2.

[0003]

By the way, in the above-mentioned one, since both barrel portions 1b and 1c are provided at the front and rear, it has been an obstacle to downsizing of the entire terminal fitting. As a countermeasure, there may be a structure in which only the first barrel portion 1b holds the shield electric wire 2 and has a conductive connection to the shield layer 2a, but in general, the inner insulating layer 2c inside the shield layer 2a is hard. Since it is hard to elastically deform, if the first barrel portion 1b is strongly caulked, the shield layer 2a is likely to be broken. On the other hand, since only the second barrel portion 1c is required, for example, as shown in FIG. 9, if the shield layer 2a is folded back to the outer surface of the outer sheath 2b and the second barrel portion 1c is caulked from above, the shield layer 2a is , Outer sheath 2b
Is too soft to obtain sufficient holding power. Therefore, as shown in the figure, a structure in which a pair of protrusions 3 and 3 is provided on the second barrel portion 1c to bite into the shielded electric wire 2 is conceivable. However, when the barrel portion 1c is strongly caulked, the core wire of the shielded electric wire 2 is 2d is sandwiched between the protrusions 3 and 3 and has a constricted shape, which causes a problem of disconnection of the core wire 2d.

The present invention has been made in view of the above circumstances, and is capable of reliably holding a shielded electric wire and electrically connecting the shielded electric wire to the shielded layer, and reducing the size of the terminal fitting. The purpose is to provide the structure of.

[0005]

In order to achieve the above-mentioned object, the invention according to claim 1 is provided at the rear end of a terminal fitting, and a core wire is formed by an inner insulating layer, a shield layer and an outer sheath.
Of the covered shielded wire, the shield layer exposed from the outer sheath and folded back to the outside of the outer sheath is caulked from the outside, and has a structure of a barrel portion, and the shielded wire penetrates into the shielded wire from opposite directions. With a pair of protrusions,
By arranging both of these protrusions in the longitudinal direction of the shielded electric wire, the core is prevented when the barrel is caulked.
It is characterized in that it allows the line to escape to the opposite side of the protrusion . The invention according to claim 2 is
Characterized by the top of the protrusion being rounded
I am trying.

[0006]

According to the first and second aspects of the invention, when the barrel portion is crimped, the terminal metal fitting is brought into close contact with the shield layer for conductive connection, and the pair of protrusions bite in a direction opposite to the shielded wire. Is held by the shielded wire. Here, since both protrusions are displaced in the longitudinal direction of the shielded wire, the core wire provided inside the shielded wire can escape to the opposite side of the protrusion even if the barrel part is caulked strongly. The core wire will not be constricted.

[0007]

As described above, according to the present invention, since one barrel portion also serves to hold the shielded electric wire and electrically connect it to the shield layer, the entire terminal fitting can be made compact. Moreover, since the barrel portion can be strongly crimped without worrying about the influence on the core wire, the holding to the shielded electric wire and the conductive connection to the shield layer can be surely performed.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a terminal fitting to which the structure of the barrel portion of the present invention is applied will be described below with reference to FIGS. As shown in FIGS. 1 and 2, the shielded electric wire 10 covers the core wire 11 with the inner insulating layer 12, the outer side with the shield layer 13, and the outer side with the outer sheath 1.
It has a structure covered with 4. And shielded wire 1
In the end portion of 0, the exposed shield layer 13 is folded back to the outside of the outer sheath 14 and
The internal insulating layer 12 is exposed before the folded back portion of 3,
Further, the core wire 11 is exposed and extends from the tip thereof.

The terminal fitting 20 is provided with a square tube portion 21 on the front side, and a pin 23 is held in the inside thereof by an insulating member 22 as shown in FIG. A small barrel portion 24 having a U-shaped cross section is provided at the rear end of the pin 23, and the core wire 11 of the shielded electric wire 10 is crimped thereto (see FIG. 3). Furthermore, the upper surface of the rectangular tube portion 21 is open on the rear side, and the small barrel portion 24 is exposed from the open portion.

At the rear end of the rectangular tube portion 21, a shielded electric wire 10 is provided.
A barrel portion 26 that is crimped to the shield layer 13 is provided. The barrel portion 26 is formed by bending a metal plate connected to the bottom portion of the rectangular tubular portion 21 into a U-shape, and includes the shield layer 13
Is crimped so as to surround (see FIG. 5). Further, the taper surface 26 is provided on the inner edge portions before and after the barrel portion 26.
A and 26A (see FIG. 2) are formed so as not to damage the shield layer 13 when crimped (see FIG. 3). Further, both ends of the barrel portion 26 are tapered by a tapered surface 26B formed on the outer surface side as shown in FIG. As a result, as shown in FIG. 5A, one end of the barrel portion 26 is closely attached to the outside of the other end and overlapped. Moreover, at the tip of the barrel portion 26,
As shown in the enlarged view of FIG. 5B, the curved surface 2 is formed along the inner edge.
6C is shaped. As a result, when the barrel portion 26 is caulked, the curved surface 26C is prevented from slidingly contacting the outer surface of the barrel portion 26 without damaging and scraping the plating.

As shown in FIG. 4, the barrel portion 26 is formed with a pair of protrusions 27, 27 directed inward. Each of the protrusions 27 is formed by forming a slit 28 extending in a direction orthogonal to the axial direction in the barrel portion 26 and tapping out a rear portion of the slit 28 (see FIG. 7). As a result, the protrusion 27 has a shape in which the front surface is oriented substantially in the axial direction. Moreover, the upper portion of the protrusion 27 is rounded.

The arrangement of the both protrusions 27, 27 is as follows. That is, as shown in FIG.
When 6 is viewed from the rear side, one protrusion 27 is arranged on the bottom surface of the barrel portion 26, and the other protrusion 27 is arranged on the left side inner surface of the barrel portion 26 in FIG. When the barrel portion 26 is crimped, both the protrusions 27, 27 bite into the shielded electric wire 10 in opposite directions (see FIG. 3). On the other hand, FIG.
When the barrel portion 26 is viewed from above, the both protrusions 27, 27 are displaced in the longitudinal direction of the shielded electric wire 10, as shown in FIG.

Next, the operation of this embodiment will be described. To attach the terminal fitting 20 to the terminal portion of the shielded electric wire 10, first, with the pin 23 removed from the rectangular tube portion 21, the core wire 11 of the shielded electric wire 10 is attached to the small barrel portion 24.
Crimp. Then, the pin 23 is inserted into the inside of the square tube portion 21 and is held by the square tube portion 21 via the insulating member 22. Then, the shield layer 13 of the shielded electric wire 10 just fits in the barrel portion 26.

In this state, the barrel portion 26 is crimped. Specifically, the piece on the left side in FIG. 4 of the barrel portion 26 is directed to the outer surface of the shield layer 13, and the piece on the right side is covered from above to crimp the barrel portion 26. Then, as shown in FIG. 3, the barrel portion 26 is brought into close contact with the shield layer 13 to be conductively connected, and at the same time, the projections 2 formed on the barrel portion 26 are formed.
7, 27 bite into the shielded electric wire 10 from above and below, and the terminal fitting 20 is held by the shielded electric wire 10. Here, since both the protrusions 27, 27 are arranged to be displaced in the longitudinal direction of the shielded electric wire 10, the core wire 11 can escape to the opposite side of the protrusion 27 even if the barrel portion 26 is strongly caulked (see FIG. 3). (See FIG. 9), the core wire is not constricted as in the conventional case (see FIG. 9). Moreover, the protrusion 27
Since the upper part of the shield has a rounded shape, the shield layer 13 or the outer sheath 14 is not cut. Further, since the front surface of the protrusion 27 is directed substantially forward in the axial direction of the shielded electric wire 10, it can be opposed even when the shielded electric wire 10 is strongly pulled.

As described above, according to the present embodiment, since the single barrel portion 26 serves to hold the shielded electric wire 10 and electrically connect the shielded electric wire to the shield layer 13, it is possible to reduce the size of the terminal fitting 20 as a whole. Becomes Moreover, since the barrel portion 26 can be strongly crimped without worrying about the influence on the core wire 11, it is possible to reliably hold the shield wire 10 and electrically connect it to the shield layer 13.

<Other Embodiments> The present invention is not limited to the above-described embodiments. For example, the embodiments described below are also included in the technical scope of the present invention.
Other than the following, various modifications can be made without departing from the scope of the invention. (1) In the above-described embodiment, the both protrusions 27, 27 are arranged on the bottom surface and one inner side surface of the barrel portion 26.
It is also possible to have a structure in which both protrusions are arranged on both inner side surfaces of the barrel portion that face each other in a U shape. (2) In the above embodiment, the core wire 11 is caulked and fixed to the pin 23, but it may be fixed by screwing or the like.

[Brief description of drawings]

FIG. 1 is an exploded side view of a terminal fitting according to an embodiment of the present invention.

[Fig. 2] Side sectional view of the terminal fitting

FIG. 3 is a side sectional view showing a state in which the terminal fitting is attached to the shielded wire.

FIG. 4 is a rear view of the barrel section.

FIG. 5A is a sectional view of the barrel portion. (B) Partial enlarged view

FIG. 6 is a plan view of the terminal fitting.

FIG. 7 is an enlarged perspective view of a protrusion.

FIG. 8 is a perspective view showing a conventional terminal fitting.

FIG. 9 is a side sectional view showing a state in which the core wire of the shielded electric wire is deformed in a constricted manner.

[Explanation of symbols]

10 ... Shielded wire 11 ... Core wire 13 ... Shield layer 14 ... External sheath 20 ... Terminal fittings 26 ... Barrel part 27 ... Protrusion

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-7-263037 (JP, A) Actual flat 6-86285 (JP, U) Actual flat 5-77863 (JP, U) Actual flat 5- 87824 (JP, U) Actual development Sho 63-39887 (JP, U) Actual development Sho 63-184567 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01R 9/05 H01R 24 / 02 H01R 24/08

Claims (2)

(57) [Claims] 1. A core wire is provided at the rear end of the terminal fitting ,
A Department insulating layer, the shield layer and is exposed from the outer sheath of the sheet <br/> Rudo wire comprising covering the external sheath and the structure of the barrel caulking the shield layer folded back on the outside of the outer sheath from the outside It is said that the barrel portion is caulked by providing a pair of protrusions that bite into the shielded wire from opposite directions, and disposing these both protrusions in the longitudinal direction of the shielded wire.
So that the core wire can escape to the opposite side of the protrusion
Structure of the barrel portion, characterized in that in the. 2. The structure of the barrel portion according to claim 1, wherein an upper portion of the protrusion has a rounded shape.