Coil Spring Inner Side Strength via Non-Uniform Fiber Distribution
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Solution Overview
Problem
Conventional coil springs face a challenge in balancing the strength between the inner and outer circumferential sides when compressed, leading to insufficient strength on the inner side, which increases the size and weight of the coil spring when attempting to enhance strength.
Innovation Solution
A coil spring design featuring a core with a fiber-reinforced resin layer where the content percentage of reinforcing fibers is higher on the inner circumferential side than the outer, with a continuous reduction in fiber percentage from the inner to the outer side, and the fibers are wound in a direction aligned with the tension load, ensuring increased strength without increasing the overall fiber amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the amount of fibers is increased to enhance the strength on the inner circumferential side, then the strength of the coil spring is improved, but the diameter of the wire rod increases and thus the size of the coil spring increases
Solution Approach 1:
The patent applies local quality by creating a non-uniform fiber distribution where the fiber content percentage varies across the cross-section. Specifically, the fiber content is higher on the inner circumferential side and lower on the outer circumferential side, matching the stress distribution pattern. This allows strength enhancement exactly where needed (inner side under higher stress) without uniformly increasing the overall fiber amount and wire rod diameter.
Solution Approach 2:
The patent changes the parameter of fiber content percentage distribution across the cross-section. By controlling the fiber content percentage to be higher on the inner circumferential side and lower on the outer circumferential side, the patent optimizes strength where stress is highest while maintaining reasonable overall dimensions, avoiding the need to uniformly increase fiber amount throughout the wire rod.
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 design effectively enhances the strength of the coil spring on the inner side while maintaining a balanced stress distribution, reducing the need for additional fibers and minimizing size and weight increments.
Implementation Method 1
a thermoset resin that firmly adheres the reinforcing fibers to one another
Implementation Method 2
a core that is elastically deformable
Data Source
AI summary
The coil spring according to the present invention is a coil spring that is formed by spirally winding a wire rod and that includes a core that is elastically deformable and a reinforced fiber layer including reinforcing fibers wound around an outer circumference of the core and a thermoset resin that firmly adheres the reinforcing fibers to one another, wherein, in at least a part of a surface layer of the reinforced fiber layer, a content percentage of the reinforcing fibers on an inner circumferential side of the coil spring is larger than a content percentage of the reinforcing fibers on an outer circumferential side of the coil spring.