Stranded conductor to be used for movable member and cable using same

• US 20030037957A1
• Filed: 07/25/2001
• Published: 02/27/2003
• Est. Priority Date: 05/25/2001
• Status: Active Grant

• Current Assignee: Hitachi Cable Limited (Proterial Ltd.)
• Original Assignee: Hitachi Cable Limited (Proterial Ltd.)
• Inventors: Ueno, Satoshi, Matsui, Hakaru, Tanaka, Hiroo
• Granted Patent: US 6,674,011 B2
• Time in Patent Office: Days
• US Class Current: 174/128.1
• CPC Class Codes: D07B 1/147 comprising electric conductors or elements for information transfer D07B1/145 takes precedence
• CPC Class Codes: H01B 5/08 Several wires or the like stranded in the form of a rope
• CPC Class Codes: H01B 7/0009 Details relating to the conductive cores

Abstract

A stranded conductor 10 to be used for movable member having a two-layered structure of an inner layer section and an outer layer section, which is prepared by stranding two or more types of element wires with each other, each type having different mechanical properties from one another wherein a first element wire 11 constituting at least the inner layer section 13 has 1.5 times or higher tensile strength than that of a second element wire 12 constituting at least a part of the outer layer section 15, and the respective element wires 11 and 12 are stranded with each other in such that a ratio of a strength in a group of inner layer element wires forming the inner layer section 13 to a strength in a group of outer layer element wires forming the outer layer section 15 (a tensile strength in the group of inner layer element wires/a tensile strength in the group of outer layer element wires) comes to be 0.5 to 5. Thus, a stranded conductor to be used for movable member having good stranding workability and good terminal processability as well as good conductivity, tensile properties, flexing properties, and high-frequency properties is provided, besides a cable using such stranded conductor as described above is also provided.

Claims

1. A stranded conductor to be used for movable member prepared by stranding two or more types of element wires with each other, each type having different mechanical properties from one another, and having a two-layered structure of an inner layer section and an outer layer section, comprising:

a first element wire constituting at least the inner layer section having 1.5 times or higher tensile strength than that of a second element wire constituting at least a part of the outer layer section; and

the respective element wires being stranded with each other in such that a ratio of a strength in a group of inner layer element wires forming the inner layer section to a strength in a group of outer layer element wires forming the outer layer section (a tensile strength in the group of inner layer element wires/a tensile strength in the group of outer layer element wires) comes to be 0.5 to 5.

3. A stranded conductor to be used for movable member as claimed in claim 1 or 2, wherein:

said respective element wires are stranded with each other in such that a ratio of a stranding pitch in said outer layer section to a layer core diameter comes to be 7 to 25.

4. A stranded conductor to be used for movable member as claimed in any one of claims 1 through 3, wherein:

an Ag plating film having 0.6 μ

m or thicker film thickness is formed around the outer circumference of all the element wires including said first and second element wires.

5. A stranded conductor to be used for movable member as claimed in any one of claims 1 through 4, wherein:

each outer diameter of said first and second element wires is formed to be 0.08 mm or thinner, and an outer diameter of each of element wires constituting said group of the outer layer element wires is made to have an equal to or smaller than that of each of element wires constituting said group of the inner layer element wires.

6. A stranded conductor to be used for movable member as claimed in any one of claims 1 through 5, wherein:

said rigid copper alloy wires are prepared from a fiber-reinforced type copper alloy containing 2 to 10 wt% of Ag or Nb, and said soft or semi-rigid copper alloy wires are prepared from copper or an Sn-containing copper alloy wherein a sum total of additives is 0.5 wt% or less.

7. A cable using a stranded conductor to be used for movable member, comprising:

an insulating layer being disposed around the outer circumference of said stranded conductor to be used for movable member as claimed in any one of claims 1 through 6.

8. A cable using a stranded conductor to be used for movable member as claimed in claim 7, wherein:

an outer conductor layer is disposed around the outer circumference of said insulating layer.

2. A stranded conductor to be used for movable member prepared by stranding two or more types of element wires with each other, each type having different mechanical properties from one another, and having a two-layered structure of an inner layer section and an outer layer section, comprising:

a first element wire made from a rigid copper alloy wire having 1000 MPa or higher tensile strength and 0.2% or higher elongation, which constitutes at least the inner layer section;

a second element wire made from a soft or a semi-rigid copper alloy wire having 70% or higher IACS and 5% or higher elongation which constitutes at least a part of the outer layer section; and

the respective element wires being stranded with each other in such that a ratio of a strength in a group of inner layer element wires forming the inner layer section to a strength in a group of outer layer element wires forming the outer layer section (a tensile strength in the group of inner layer element wires/a tensile strength in the group of outer layer element wires) comes to be 0.5 to 5.