Core electric wire for multi-core cable and multi-core cable
AssigneeSumitomo Electric Industries, Ltd.
InventorsShigeyuki TANAKA, Shinya NISHIKAWA, Hiroyuki OKAWA, Takaya KOHORI, Yuhei MAYAMA, Takayuki HIRAI
Life of this patent
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Abstract
An object of the present disclosure is to provide a core electric wire for a multi-core cable that is superior in flex resistance at low temperature, and a multi-core cable employing the same. A core electric wire for a multi-core cable according to an aspect of the present disclosure comprises a conductor obtained by twisting element wires, and an insulating layer covering the conductor, wherein a linear expansion coefficient C of the insulating layer at from 25° C. to −35° C. is no less than 1×10−5 K−and no greater than 2.5×10−4 K−1.
Claims21
A core electric wire for a multi-core cable, comprising:
- a conductor obtained by twisting element wires;
- and an insulating layer that covers an outer periphery of the conductor, wherein a linear expansion coefficient C of the insulating layer at from 25° C. to −35 ° C. is no less than 1×10−5 K−1 and no greater than 2.5×10−4 K−1.
A core electric wire for a multi-core cable, comprising:
- a conductor obtained by twisting element wires;
- and an insulating layer that covers an outer periphery of the conductor, wherein
- a modulus of elasticity E of the insulating layer at −35° C. is no less than 1,000 MPa and no greater than 3,500 MPa.
The multi-core cable according to claim. 12, wherein at least one of the core electric wires is obtained by twisting subsets of the core electric wires.
A core electric wire for a multi-core cable, comprising:
- a conductor obtained by twisting element wires;
- and an insulating layer that covers an outer periphery of the conductor, wherein
- number of times of bending of the multi-core cable, counted according to a flex test is no less than 10,000,
- the flex test comprising:
- placing the multi-core cable perpendicularly between a first mandrel and a second mandrel each having a diameter of 60 mm arranged horizontally and parallel to each other;
- repeatedly bending the multi-core cable from side to side at 90° in a horizontal direction such that an upper end thereof is in contact with an upper side of the first mandrel and then in contact with an upper side of the second mandrel;
- and
- counting the number of times of bending until a breakage of the multi-core cable (a state unable to carry a current),
- under a test condition involving:
- a downward load of 2 kg applied to a lower end of the multi-core cable;
- a temperature of −30° C.;
- and a bending rate of 60 times/min.
Dependencies are inferred from the claim text.