Motorcycle Swingarm Bracket Detachable Case Mounting
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Solution Overview
Problem
Existing motorcycle swingarm supporting structures face challenges in balancing rigidity and design freedom, as direct support by the crankcase restricts design options and increases rigidity excessively.
Innovation Solution
A swingarm supporting structure featuring a separately formed bracket that is detachably fixed to the case in a direction intersecting the pivot shaft, allowing for reduced stress concentration and increased design flexibility by placing the bracket on the opposite surface of the swingarm, thereby preventing excessive rigidity and enhancing design freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the swingarm is directly supported by the crankcase, then the support structure is simple, but the rigidity of the crankcase becomes excessive and design freedom is restricted
Solution Approach 1:
The support structure is divided into two separate components: the crankcase and a detachable bracket. The bracket is formed separately from the crankcase and can be attached or detached as needed. This segmentation allows the crankcase to maintain its primary function without excessive rigidity requirements, while the bracket provides the necessary swingarm support, thereby increasing design freedom and adaptability.
2Adaptability or versatility
If the bracket is formed separately from the case, then design freedom is improved, but the structure becomes more complex
Solution Approach 1:
While the bracket is formed separately to improve design freedom, it is designed to be detachably fixed to the crankcase, allowing the two components to function together as an integrated support system. This merging approach maintains structural effectiveness while preserving the benefits of separate formation, such as optimized stress distribution and increased design flexibility.
3Stress or pressure
If the bracket is fixed from a direction intersecting the pivot shaft, then stress concentration is reduced, but the attachment position options are limited
Solution Approach 1:
The bracket is designed to be attachable from multiple directions, including directions intersecting the pivot shaft. By considering three-dimensional attachment possibilities rather than being restricted to a single plane, the design achieves both reduced stress concentration (through intersecting direction attachment) and increased attachment position options (through multi-directional capability).
4Strength
If the rigidity of the crankcase is increased to support the swingarm, then support strength is improved, but the degree of freedom of design is restricted
Solution Approach 1:
The swingarm support function is extracted from the crankcase and transferred to a separate detachable bracket. This extraction allows the crankcase to maintain its original design freedom and adaptability, while the bracket provides the necessary support strength. The bracket can be specifically designed for support functionality without compromising the crankcase's design flexibility.
Data Source
AI summary
A swingarm supporting structure can prevent rigidity of a case from becoming excessive and can improve a degree of freedom of design. The swingarm supporting structure includes: a case in which a power unit is stored; and a bracket for freely pivotally supporting a swingarm up and down through a pivot shaft. The swingarm supports an axle, and the bracket is detachably fixed to the case in a fixed direction intersecting the pivot shaft.