Multi-twisted Wire with Flattened Side Strands for Noise Reduction
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Solution Overview
Problem
Operating wires with multiple strand structures face reduced fatigue resistance and generate cyclic groove movement sound due to slide movement between direction turning members, particularly when used in high-temperature conditions or with resin guides, leading to abnormal noise and wire deformation.
Innovation Solution
An operating wire with a multiple strand structure featuring a core strand and side strands twisted together, where the side strands have a smooth surface extending radially and axially, with a specific length and pitch multiplying factor to reduce contact pressure and point contact spots, thereby minimizing strand track formation and noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the operating wire is guided by a resin direction turning member, then the wiring flexibility is improved, but abnormal noise is generated due to strand track formation
Solution Approach 1:
The patent applies local quality by providing a smooth surface treatment specifically at the outer peripheral portion of the operating wire that contacts the direction turning member, while other portions maintain their original stranded structure. This localized modification reduces friction and strand track formation at the critical contact area without compromising the overall wire flexibility and strength.
Solution Approach 2:
The patent changes the surface parameter of the operating wire by applying a smooth surface coating or treatment to the outer peripheral portion. This parameter change reduces the coefficient of friction between the wire and the resin guide, thereby suppressing strand track formation and abnormal noise generation while maintaining the wire's mechanical properties.
2Adaptability or versatility
If the operating wire has a multiple strand structure, then the flexibility is improved, but the fatigue resistance is reduced due to point contact deformation
Solution Approach 1:
The patent applies local quality by providing a smooth surface treatment specifically at the outer peripheral portion of the operating wire that contacts the direction turning member, while other portions maintain their original stranded structure. This localized modification reduces friction and strand track formation at the critical contact area without compromising the overall wire flexibility and strength.
Solution Approach 2:
The patent employs a composite structure combining the traditional stranded wire core with an additional smooth surface layer or coating on the outer peripheral portion. This composite approach maintains the flexibility benefits of the stranded structure while adding a protective layer that reduces wear and improves fatigue resistance at the contact surface.
3Object-generated harmful factors
If the element wire is deformed to have a smooth surface, then the strand track formation is suppressed, but the fatigue resistance is reduced due to preferential deformation at point contacts
Solution Approach 1:
The patent applies local quality by providing a smooth surface treatment specifically at the outer peripheral portion of the operating wire that contacts the direction turning member, while other portions maintain their original stranded structure. This localized modification reduces friction and strand track formation at the critical contact area without compromising the overall wire flexibility and strength.
Solution Approach 2:
The patent applies partial action by providing the smooth surface treatment only at the outer peripheral portion of the wire where contact with the direction turning member occurs, rather than treating the entire wire surface. This partial treatment is sufficient to reduce strand track formation and noise while minimizing the impact on fatigue resistance.
Data Source
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AI summary
This wire (1) is for operation and has a multi-twisted structure constituted by twisting a plurality of side strands (3), each of which is formed by twisting together a plurality of wires (3a, 3b), around a core strand (2) formed by twisting a plurality of wires (2a, 2b, 2c, 2d) together. The wire (1) is characterized in that the side wire (3b) of the side strand (3) faces the outside of the wire (1) in the radial direction at a site located on the outer circumference of the wire (1) and has a flattened surface (P) in which a flat portion (F) provided in a portion of the side wire (3b) in the circumferential direction extends in the X axis direction, the length in the X axis direction of the flattened surface (P) being 4.8-11.0 times the diameter of the side wire (3b), and the pitch magnification of the side strand (3) being 7.0-12.0 times the diameter. As a result of the foregoing, it is possible to suppress the occurrence of groove movement direction noise caused when a direction change member and the wire slide against each other, and suppress a decrease in the fatigue resistance of the wire.