Four-Point Link Weight Reduction via Aluminum Alloy and Curved Arms
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Solution Overview
Problem
Existing four-point links for commercial vehicles are heavy due to their construction materials, such as gray or nodular cast iron and steel, which increases the dead weight and affects vehicle performance.
Innovation Solution
A four-point link with an X-shaped design featuring outward protruding arms with bearing eyes, where the arms have parallel outer surfaces connected via arcuately curved surfaces, and a central area with parallel arcuate wall sections, allowing for reduced weight through convex or concave designs and material reinforcement, manufactured via drop forging or laminate construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If four-point links are made from gray or nodular cast iron or steel, then strength and reliability are ensured, but dead weight increases significantly
Solution Approach 1:
The patent changes the material parameters by using aluminum alloy instead of traditional cast iron or steel, fundamentally altering the density and strength characteristics. This material substitution enables weight reduction while maintaining structural integrity through optimized alloy composition and heat treatment parameters
Solution Approach 2:
The invention employs composite construction by combining aluminum alloy material with optimized geometric structures including hollow arms and strategic reinforcement zones. This composite approach integrates lightweight material properties with structural design to achieve both weight reduction and sufficient strength
2Weight of moving object
If the four-point link design is simplified to reduce weight, then dead weight decreases, but ability to withstand torsional loads and various forces may be compromised
Solution Approach 1:
The patent applies local quality by implementing non-uniform arm design where wall thickness varies along the arm length. The arms feature thicker sections at critical stress zones (near mounting points and central area) and thinner sections elsewhere, optimizing strength-to-weight ratio by concentrating material where torsional and bending stresses are highest
Solution Approach 2:
The invention incorporates curved outer surfaces on the arms rather than straight edges, creating aerodynamic and stress-distributing geometries. These curved surfaces help distribute stress more evenly under torsional loads while reducing material requirements compared to conservative straight-edged designs
3Ease of manufacture
If traditional materials and designs are used, then manufacturing experience and availability are advantageous, but weight reduction and performance improvement are limited
Solution Approach 1:
The patent utilizes established aluminum alloy casting and heat treatment processes, applying proven manufacturing parameters to a new application. By leveraging existing metallurgical knowledge and processing capabilities for aluminum alloys, the invention achieves weight reduction without requiring entirely new manufacturing technologies
Solution Approach 2:
The design incorporates features suitable for conventional manufacturing including defined mounting surfaces, standardized bearing eye configurations, and geometries amenable to casting or forging. These localized traditional features maintain ease of manufacture while the overall aluminum alloy construction and optimized arm geometries enable weight reduction
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The extended arms (6-9) extended from a central region (5) has outer-end bearings (10-13). The two bearings (10,11) are connected with vehicle chassis frame (3), and the two bearings (12,13) are connected with beam axle (2). The mutually parallel outer surfaces (14A,14B,15A,15B,16A,16B,17A,17B) of each arm are joined with arcuated outer surfaces (18A,18B,18C,18D) of central region. The central region has four arc-shaped wall sections (20A-20D) which are spaced apart from each other at specific interval (25) corresponding to distance (26) of arm outer surfaces.