Hose Steel Wire Reinforcement E-Ratio Gradient
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Solution Overview
Problem
High pressure hoses with steel wire reinforcement layers face challenges in achieving optimal load sharing among layers, leading to premature overloading and reduced impulse life, while existing solutions often require multiple materials and complex treatments.
Innovation Solution
The design features at least two steel wire reinforcement layers with varying E-ratios, where the outermost layer has a higher E-ratio than the innermost, achieved through heat treatment or crimping, to ensure equal loading of all wires and improved flexibility, using a single type of steel wire with specific alloy compositions and configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If steel wire reinforcement layers are used in high pressure hoses, then the burst pressure and strength are improved, but the load sharing among layers becomes unbalanced leading to premature overloading of inner layers
Solution Approach 1:
The patent applies different E-ratios to different reinforcement layers based on their radial position. The innermost layer uses steel wires with a first E-ratio, while outer layers use wires with different E-ratios. This local differentiation ensures that each layer has the appropriate stiffness characteristics for its position, enabling balanced load distribution across all layers during pressure cycles and improving impulse life.
Solution Approach 2:
The patent changes the E-ratio parameter of steel wires across different reinforcement layers. By varying this mechanical property parameter (modulus of elasticity ratio) from inner to outer layers, the patent optimizes the load sharing characteristics of the hose reinforcement system, preventing premature failure of inner layers while maintaining overall burst pressure performance.
2Reliability
If multiple types of steel wire with different E-ratios are used in reinforcement layers, then the load sharing and impulse life are improved, but the material complexity and manufacturing complexity increase
Solution Approach 1:
The patent implements local quality by assigning different E-ratio characteristics to steel wires in different radial layers. This ensures that each layer contributes optimally to load bearing based on its position, improving impulse life while maintaining a relatively simple overall structure that uses only steel wire reinforcement throughout.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the burst pressure and impulse life of the hoses by ensuring all reinforcement layers are loaded equally, reducing material complexity and improving flexibility, while maintaining tensile strength and resistance to fatigue.
Implementation Method 1
achieved through heat treatment or crimping
Implementation Method 2
achieved through heat treatment or crimping
Data Source
Figure 1a~1b
Figure 1c~2
Figure 3~4
AI summary
In order to improve the equal loading of steel wires in a high pressure hose,steel wires with different load elongation properties are introduced into the subsequent reinforcement layers of a hose. The difference in load elongation is quantified by means of the E-ratio of the wire that is equal to the tensile strength divided by the elongation at break. The steel wires of the radially outermost steel wire reinforcement layer have the highest E-ratio, while the radially innermost steel wire reinforcement layer has the lowest E-ratio. The E-ratio of any steel wire reinforcement layer is not lower than the E-ratio of any inner laying steel wire reinforcement layer. The E-ratio of the steel wires can be influenced by either a thermal treatment or by a mechanical treatment. In the mechanical treatment crimps or bends can be introduced into the wire by guiding them through a preforming device.