CROSS REFERENCE TO RELATED APPLICATIONS

This application is a national phase of PCT application No. PCT/JP2018/044761, filed on 5 Dec. 2018, which claims priority from Japanese patent application No. 2018-091268, filed on 10 May 2018, all of which are incorporated herein by reference.

TECHNICAL FIELD

A technique disclosed by this specification relates to a wire with terminal and particularly to a waterproof structure in a terminal.

BACKGROUND

Conventionally, a wire with terminal having a waterproof structure applied to a terminal is, for example, known from Patent Document 1. In this crimping terminal, a wire connecting portion includes a first barrel piece and a second barrel piece extending on both ends of a bottom portion, an end part of a wire is wound by the first barrel piece, and the end part of the wire and the first barrel piece are wound by the second barrel piece to crimp the wire connecting portion to the end part of the wire. Further, a water cut-off member is stuck to inner wall surfaces of the bottom portion, the first barrel piece and the second barrel piece, and this water cut-off member forms a water cut-off region between the inner wall surface of the wire connecting portion and the wire after crimping is completed. In this way, water intrusion into between the wire connecting portion and a core on a tip is prevented.

PRIOR ART DOCUMENT

Patent Document

Patent Document 1: JP 2017-111941A

SUMMARY OF THE INVENTION

Problems to be Solved

However, in this technique, there is a concern that the water cut-off member is pushed out from an end of a terminal connecting portion by a tightening force in crimping the first and second barrel pieces and water intrudes into the inside of the terminal connecting portion.

Means to Solve the Problem

A wire with terminal according to the technique disclosed in this specification is provided with a wire including a core and an insulation coating covering around the core, and a terminal including a coating crimping portion crimped to the insulation coating, wherein the wire is pulled out rearward from the terminal, a water cut-off member for suppressing liquid intrusion into the core is disposed between an inner peripheral surface of the coating crimping portion and an outer peripheral surface of the insulation coating, and the coating crimping portion is provided with an oblique extending portion for reducing rearward outflow of the water cut-off member due to the crimping.

In the wire with terminal in which the coating crimping portion is crimped to the insulation coating, there is a concern that the water cut-off member is pushed out rearward from between the inner peripheral surface of the coating crimping portion and the outer peripheral surface of the insulation coating in crimping the coating crimping portion to the insulation coating. In contrast, according to the above configuration, the outflow of the water cut-off member to outside is reduced by the oblique extending portion, wherefore water intrusion into the coating crimping portion from behind can be prevented.

The following configurations are preferable as embodiments relating to the technique disclosed in this specification.

The coating crimping portion includes a bottom portion having the insulation coating placed thereon, a first barrel piece extending from one side end of the bottom portion and a second barrel piece extending longer than the first barrel piece from another side end of the bottom portion, and the inner peripheral surface of the coating crimping portion is closed over an entire circumference by the second barrel piece winding around the outer peripheral surface of the wire and the first barrel piece.

Accordingly, for example, as compared to the case where the inner peripheral surface of the coating crimping portion is not closed over the entire circumference, the water cut-off member is easily pushed out rearward from between the inner peripheral surface of the coating crimping portion and the outer peripheral surface of the insulation coating in crimping the coating crimping portion to the insulation coating, but the outflow of the water cut-off member to outside can be reduced by the oblique extending portion. Specifically, a configuration based on the oblique extending portion is very effective when the inner peripheral surface of the coating crimping portion is closed over the entire circumference by the second barrel piece winding around the outer peripheral surface of the insulation coating and the first barrel piece as in this configuration.

The coating crimping portion includes a ceiling portion formed at a position facing the bottom portion via the wire by overlapping the first and second barrel pieces, and the oblique extending portion is provided behind the bottom portion.

In crimping the coating crimping portion to the insulation coating, clearances are formed between the first and second barrel pieces and between the second barrel piece and the wire on the side of the ceiling portion of the coating crimping portion, but clearances are hardly formed on the side of the bottom portion and the water cut-out member is easily pushed out rearward from the coating crimping portion. In contrast, since the water cut-out member remains on the oblique extending portion provided behind the bottom portion of the coating crimping portion according to the above configuration, a water cut-off effect on the side of the bottom portion can be enhanced on a back surface side of the coating crimping portion.

Further, a mold composed of an upper mold and a lower mold is generally used to crimp the coating crimping portion to the insulation coating. In crimping, the oblique extending portion has only to be placed to project from the rear end of the lower mold. Thus, the oblique extending portion is easily positioned with respect to the mold and hardly displaced during crimping.

The oblique extending portion is inclined in a diameter expanding direction toward a rear side. Specifically, by providing the oblique extending portion extending rearward while being inclined in the direction to expand a diameter of the coating crimping portion in a rear end part of the coating crimping portion, a space can be formed between the insulation coating and the oblique extending portion and the water cut-off member can easily remain in this space.

The terminal further includes a rear extending portion connected to a rear end of the coating crimping portion over an entire circumference and configured to surround the insulation coating, and the oblique extending portion constitutes the rear extending portion.

According to this configuration, since the water cut-off member pushed out rearward from the coating crimping portion is accommodated between the rear extending portion and the insulation coating over the entire circumference, the water cut-off effect on the back surface side of the coating crimping portion can be enhanced. Further, since a water intrusion path into the coating crimping portion is closed from the back surface side by the rear extending portion, the insulation coating can be tightened without considering an influence on the water cut-off member in the coating crimping portion.

A parallel extending portion is further provided which is connected to a rear end of the rear extending portion over an entire circumference, extends rearward and surrounds the insulation coating, and a ceiling portion and a bottom portion of the parallel extending portion extend in parallel to the insulation coating.

According to this configuration, since a part of the water cut-off member that cannot be accommodated in the rear extending portion remains on the parallel extending portion, the water cut-off effect on the back surface side of the coating crimping portion can be enhanced. Further, since the bottom portion of the rear extending portion extends in parallel to the insulation coating, the water cut-off member hardly hangs down from the rear end of the rear extending portion.

Effect of the Invention

According to the wire with terminal according to the technique disclosed in this specification, it is possible to enhance the water cut-off effect in the terminal.

