Vehicle Suspension Swing Arm Local Reinforcement Design
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Solution Overview
Problem
Existing swing arms for vehicle suspensions face challenges in balancing manufacturing costs and weight with the need for high stiffness, as they often require costly and weight-increasing folding along the entire perimeter.
Innovation Solution
A swing arm design featuring a single-sheet metal piece with a main open section and secondary closed sections created by folding and securing metal strips, particularly in edge zones, to enhance stiffness and mechanical strength while minimizing overall cost and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the swing arm is manufactured by folding the edge zones substantially along the whole perimeter, then the stiffness and mechanical strength are improved, but the manufacturing cost and weight increase
Solution Approach 1:
The patent applies local quality by implementing closed sections only in specific edge zones where reinforcement is needed, rather than folding the entire perimeter. The main portion retains an open section configuration, while secondary portions have closed sections formed by folding and securing metal strips. This localized approach provides necessary stiffness in critical areas without the weight penalty of complete perimeter folding.
2Strength
If the swing arm is manufactured by folding the edge zones substantially along the whole perimeter, then the stiffness and mechanical strength are improved, but the manufacturing cost increases
Solution Approach 1:
The patent reduces manufacturing cost by applying the costly folding and securing operation only to secondary portions where it is most needed, rather than the entire perimeter. The main portion is manufactured using a simpler stamping process from a single sheet metal piece, minimizing the use of expensive labor-intensive operations while maintaining necessary structural integrity.
Solution Approach 2:
The swing arm is segmented into a main portion with an open section and secondary portions with closed sections. This segmentation allows different manufacturing approaches to be applied to different zones: stamping for the main portion and selective folding/securing for secondary portions, optimizing both cost and performance.
3Strength
If folding is applied along the whole perimeter, then the mechanical strength is improved, but the weight of the arm increases
Solution Approach 1:
The patent implements local quality by providing closed sections only in secondary portions along edge zones where additional mechanical strength is required, while the main portion maintains an open section configuration. This selective reinforcement provides necessary strength in critical areas without the weight increase associated with complete perimeter folding.
4Weight of moving object
If a single-sheet metal piece with open section is used, then the cost and weight are reduced, but the stiffness in certain zones is insufficient
Solution Approach 1:
The patent resolves this contradiction by maintaining the lightweight open section configuration in the main portion while adding closed sections in secondary portions where stiffness is critical. This is achieved by folding and securely attaching metal strips to form closed sections in specific edge zones, providing localized reinforcement without compromising the overall lightweight design.
Solution Approach 2:
The patent creates a composite structure by combining the open section main portion with closed section secondary portions formed by folding and securing metal strips. This composite configuration integrates the advantages of both open and closed sections, achieving optimal balance between weight and stiffness through heterogeneous structural elements.
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 solution achieves a cost-effective and lightweight swing arm with improved stiffness and mechanical properties, specifically in areas requiring reinforcement, without increasing the arm's weight or cost significantly.
Implementation Method 1
formed by at least one strip of the metal piece folded onto the main portion
Implementation Method 2
firmly secured with a free edge of the strip to the main portion
Data Source
AI summary
A swing arm for a suspension of a vehicle comprises a substantially transversely outer arm portion having a free end for mounting of a support for supporting a wheel of the vehicle and a substantially transversely inner arm portion with a first branch and second branch. The first branch is substantially aligned with the outer arm portion and has a free end for mounting of a first connector for connection to a body of the vehicle, and the second branch extends along an arched path towards a rear part of the vehicle and has a free end for mounting of a second connector for connection to the vehicle body. A single-sheet metal piece includes a main portion having an open section and at least one secondary portion arranged in an edge zone of the swing arm, having a closed section, and formed by at least one strip of the metal piece folded onto the main portion and firmly secured with a free edge of the strip to the main portion. A method for manufacturing the swing arm comprises steps of obtaining the main portion by stamping of the metal piece, folding the strip of the metal piece so as to obtain the secondary portion, and firmly securing the free edge of the strip to the main portion.