Composite Leaf Spring Fiber Alignment for Weight Reduction
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Solution Overview
Problem
Traditional steel leaf springs used in vehicle suspension systems are heavy, inefficient in energy storage, noisy, and prone to corrosion, requiring additional damping and mounting considerations to manage their weight and performance.
Innovation Solution
Development of composite leaf springs made from a thermoplastic matrix material reinforced with fibers such as carbon, glass, or Kevlar, which provide higher energy storage per unit mass, reduced noise transmission, and lower damping requirements, using materials like polyvinylidene fluoride and high-strength fibers like E-glass and aramid fibers, and incorporating metals for specific properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If steel leaf springs are used for load carrying and energy storage, then structural strength and reliability are improved, but weight increases significantly
Solution Approach 1:
The patent applies composite materials by combining fiber reinforcement (such as carbon fiber, glass fiber, or aramid fiber) with a thermoplastic matrix material to create a composite leaf spring. This composite structure provides the necessary structural strength while significantly reducing weight compared to traditional steel leaf springs, directly resolving the contradiction between strength and weight.
2Use of energy by moving object
If steel leaf springs are used for energy storage, then load carrying capacity is improved, but energy storage efficiency per unit mass decreases
Solution Approach 1:
The composite material construction with high-strength fibers embedded in a thermoplastic matrix enables superior energy storage capacity per unit mass. The fiber reinforcement provides high elastic modulus and strength, allowing the spring to store more energy while being lighter, thus improving energy storage efficiency.
Solution Approach 2:
The patent changes the material parameters by transitioning from metallic steel to composite materials with different mechanical properties. The composite material offers higher specific energy storage capacity (energy per unit mass), allowing optimization of the spring's mass-spring rate product for improved energy storage efficiency.
3Reliability
If steel leaf springs are used in suspension systems, then durability and reliability are improved, but noise transmission increases
Solution Approach 1:
The composite leaf spring construction with fiber reinforcement in a thermoplastic matrix provides inherent noise reduction capabilities. The composite material structure dampens vibrations and reduces noise transmission more effectively than steel, while maintaining the durability and reliability needed for suspension applications.
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
The composite leaf springs offer significantly higher energy storage per unit mass, reduced weight, lower noise transmission, and reduced damping needs, resulting in improved vehicle performance and efficiency.
Implementation Method 1
a thermoplastic matrix material reinforced with fibers embedded and aligned in the matrix of the composite leaf spring
Data Source
AI summary
A composite leaf spring comprising a thermoplastic matrix material reinforced with fibers embedded and aligned in the matrix of the composite leaf spring.