Patent ID: 11887758
Assignee: SUMITOMO WIRING SYSTEMS, LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B  Y | IPC B  H

Claim 0:
1. An insulated electric wire comprising:
a conductor in which a plurality of elemental wires made of a metal material are twisted together; and
an insulation covering that covers an outer circumference of the conductor,
wherein the insulated electric wire comprises:
an exposed portion in which the insulation covering is removed from the outer circumference of the conductor;
a covered portion in which the insulation covering covers the outer circumference of the conductor, the exposed portion and the covered portion being provided adjacent to each other in a longitudinal axis direction of the insulated electric wire; and
a water-stopping portion in which a water-stopping agent is placed over the exposed portion and an area of the covered portion that is adjacent to the exposed portion, and
the water-stopping portion comprises:
a filled area between the plurality of elemental wires in which gaps between the plurality of elemental wires in the exposed portion are filled with the water-stopping agent;
an exposed portion outer circumferential area in which the water-stopping agent covers the outer circumference of the conductor in the exposed portion; and
a covered portion outer circumferential area in which the water-stopping agent covers an outer circumference of the insulation covering in the area of the covered portion that is adjacent to the exposed portion, wherein

the filled area between the plurality of elemental wires, the exposed portion outer circumferential area, and the covered portion outer circumferential area are continuous with each other,
a twist pitch of the plurality of elemental wires in the exposed portion is less than a twist pitch at least in a remote area that is an area of the covered portion except for an area adjacent to the exposed portion,
a layer thickness of the water-stopping agent in the exposed portion outer circumferential area is greater than a layer thickness in the covered portion outer circumferential area,
the layer thickness of the water-stopping agent in the covered portion outer circumferential area is less than a thickness of the insulation covering,
an elasticity modules of the water-stopping agent is greater than an elasticity modulus of the insulation covering, and
the water-stopping agent directly contacts a surface of the insulation covering in the covered portion and a surface of the conductor in the exposed portion.