Straddle Vehicle Side Stand Bracket Rigidity Distribution
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Solution Overview
Problem
In straddle vehicles like motorcycles, the local increase in rigidity due to the proximity of side stand and main step brackets to the body frame leads to an imbalance in rigidity, which can affect the vehicle's structural integrity and stability.
Innovation Solution
The design includes a side stand bracket with a first fixing portion connected only to the pivot frame and a second fixing portion connected only to the main step bracket, dispersing fastening points and reducing the concentration of rigidity, while the main step bracket is arranged to cover the side stand bracket and has an opening for the fastening bolt, and the second fastening bolts have a smaller diameter, thereby distributing the rigidity and reducing protrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the side stand bracket and main step bracket are brought close to each other to concentrate fastening members, then the ease of manufacture is improved, but the rigidity of the body frame becomes unbalanced due to local increase in rigidity
Solution Approach 1:
The side stand bracket is divided into two separate fixing portions: a first fixing portion connected to the pivot frame and a second fixing portion connected to the main step bracket. This segmentation disperses the fastening points across different structural components, preventing local rigidity concentration while maintaining manufacturing efficiency.
Solution Approach 2:
The side stand bracket acts as an intermediary component that connects the pivot frame and main step bracket through separate fixing portions. This intermediary structure distributes the mechanical connections across multiple attachment points, avoiding excessive rigidity in any single location while preserving the overall structural integrity.
2Ease of operation
If the side stand bracket is made visible, then the ease of operation is improved for maintenance, but the appearance design is deteriorated
Solution Approach 1:
The side stand bracket is nested within the spatial arrangement of other vehicle components, specifically positioned such that it is obscured by the main step bracket and shift lever assembly. This nesting arrangement hides the bracket from external view, improving appearance design while maintaining its functional accessibility for maintenance operations.
3Strength
If the first fastening bolt is made with large diameter for strong connection, then the strength is improved, but the device complexity increases due to different bolt sizes
Solution Approach 1:
The first fixing portion of the side stand bracket is designed with local structural characteristics that enable the use of a large-diameter fastening bolt specifically where high connection strength is required (at the pivot frame attachment point), while other portions use smaller bolts appropriate for their lower load requirements. This local quality differentiation optimizes both strength and complexity.
Data Source
AI summary
A straddle vehicle includes: a body frame including a main frame extending rear-downward from a head pipe, a pivot frame extending downward from the main frame, and a lower frame which extends downward from the head pipe and extends rearward, and further, is connected to a lower portion of the pivot frame; a side stand which supports a vehicle body during parking; and a main step on which a foot of a rider is placed. A side stand bracket for supporting the side stand includes a first fixing portion connected only to the lower portion of the pivot frame and a second fixing portion connected only to a main step bracket for supporting the main step.