C-Section Swingarm Assembly with Covers for Weight and Rigidity
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Solution Overview
Problem
Soft tail motorcycle swingarms require a balance of high strength, high rigidity, and low weight while being cost-effectively manufactured, with existing designs facing challenges in achieving these requirements.
Innovation Solution
A swingarm assembly featuring a C-shaped cross-section with integral stiffening ribs and covers made from aluminum alloys, manufactured using permanent mold casting, which provides structural integrity and encloses cavities to prevent contamination and reduce manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the swingarm uses a solid structural design to achieve high strength and rigidity, then the strength and rigidity are improved, but the weight increases
Solution Approach 1:
The swingarm is divided into a C-shaped side arm structure with enclosed cavities formed by attaching covers to the open C-section. This segmentation allows the structure to maintain strength and rigidity through the enclosed cavity design while reducing material usage and weight compared to a fully solid structure.
Solution Approach 2:
The swingarm employs composite construction by attaching cover components to the C-shaped side arms. This composite approach allows optimization of material distribution, providing structural integrity where needed while minimizing weight in non-critical areas, achieving a balance between strength/rigidity and weight reduction.
2Strength
If the swingarm uses complex structural features like stiffening ribs and enclosed cavities to improve strength and rigidity, then the strength and rigidity are improved, but the manufacturing complexity increases
Solution Approach 1:
The swingarm design segments the structure into C-shaped side arms and separate cover components. This segmentation simplifies manufacturing by allowing each component to be produced independently using standard processes, then assembled together. The enclosed cavities are formed by attaching covers to the C-sections, avoiding the need for complex internal cores or multi-step casting operations.
Solution Approach 2:
The manufacturing approach changes the structural parameters from a fully solid or complex internally-cored design to a modular assembly of C-shaped sections and covers. This parameter change enables the use of simpler casting or forming processes for each component while achieving the same structural benefits of enclosed cavities and stiffening features through the assembly configuration.
Data Source
AI summary
A swingarm assembly for a two-wheel vehicle includes: a swingarm body including first and second side arms extending in a longitudinal direction and a transverse cross member connected to the first and second side arms, each side arm having a C-shaped cross-section open toward an outer lateral side; and covers attached to the outer lateral sides of the first and second side arms and extending in the longitudinal direction, the covers enclosing at least a portion of the C-shaped cross-section to form enclosed cavities delimited by an inner surface of the side arm and an inner surface of the cover.