Hybrid Leaf Spring Variable Stiffness for Changing Vehicle Loads
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Solution Overview
Problem
Existing leaf spring - shock absorber systems in vehicles fail to achieve optimal performance under varying load conditions, terrain types, and driving scenarios, leading to compromised vehicle stability, comfort, and increased fuel consumption, while weight distribution changes affect safety and stability.
Innovation Solution
A hybrid leaf spring with variable stiffness, combining metallic and composite materials, integrated with piezoelectric materials or shape memory alloys, allows real-time monitoring and dynamic adjustment of stiffness through sensors, enhancing structural integrity and enabling proactive maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional leaf spring systems are used, then the structure is simple and reliable, but the performance is not optimal under varying load conditions and terrain types
Solution Approach 1:
The patent implements variable stiffness leaf springs where the stiffness characteristic can be dynamically adjusted based on operating conditions. This is achieved through adjustable mounting systems that allow modification of the spring's mechanical properties, enabling optimal performance across different load conditions and terrain types while maintaining system reliability
Solution Approach 2:
The invention changes the stiffness parameter of the leaf spring dynamically by providing adjustable mounting arrangements. The mounting system allows modification of geometric and mechanical parameters of the leaf spring assembly, enabling adaptation to varying operational requirements without fundamentally changing the spring structure
2Strength
If heavier leaf springs are used to improve structural integrity, then strength increases, but fuel consumption increases
Solution Approach 1:
The patent employs composite construction in the leaf spring assembly, combining different materials to achieve high structural integrity with reduced weight. The composite structure maintains necessary strength and stiffness while being lighter than traditional solid metal springs, thereby reducing fuel consumption without compromising structural integrity
3Adaptability or versatility
If weight distribution is modified for vehicle customization, then vehicle configuration flexibility improves, but stability and safety are compromised
Solution Approach 1:
The adjustable mounting system allows dynamic adaptation of the leaf spring characteristics to compensate for weight distribution changes. When vehicle configuration is modified, the mounting parameters can be adjusted to maintain optimal stability and safety performance, enabling customization without compromising vehicle handling
4Ease of manufacture
If fixed stiffness leaf springs are used, then manufacturing is simple, but performance optimization under different driving scenarios is limited
Solution Approach 1:
The invention introduces adjustable mounting systems that provide variable stiffness capability while maintaining relatively simple manufacturing processes. The base leaf spring structure can be manufactured using conventional methods, and the adjustability is achieved through modular mounting components that enhance performance without significantly complicating production
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 hybrid leaf spring improves vehicle stability, comfort, and safety by dynamically adapting to changing conditions, reducing weight, and optimizing performance through intelligent monitoring and adjustment.
Implementation Method 1
the piezoelectric materials inserted within the variable stiffness hybrid leaf spring 10, due to their ability to convert mechanical stress or strain into an electrical signal, allow monitoring and measuring the applied load, strain and other relevant parameters in real time
Implementation Method 2
Shape memory materials, such as nickel-titanium alloys, embedded within the hybrid leaf spring 10 with variable stiffness, possess the ability to modify their crystalline structure and recover their original shape when subjected to specific conditions
Implementation Method 3
an elastic one, the spring, for example of the leaf spring type, which connects the chassis to the wheels and has the task of transforming the stresses coming from the ground into kinetic energy by loading the spring
Data Source
Figure 1
AI summary
A hybrid leaf spring (10) with variable stiffness for vehicles is described, comprising a first leaf (1) made of metallic material, fixed to a second leaf (2) made of composite material, said second leaf (2) made of composite material comprising piezoelectric materials or shape memory alloys (SMA) inserted into the composite structure to actively control the mechanical response of the hybrid leaf spring (10) by adjusting its stiffness or shape.