Saddle Riding Vehicle Step Bracket Recessed Pivot Frame
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Solution Overview
Problem
In motorcycle design, the step bracket attached to the vehicle body frame often overhangs, causing interference with the occupant's feet and discomfort due to its outward positioning.
Innovation Solution
The step bracket is attached to a pivot frame with a step bracket attachment section that is recessed inward in the vehicle width direction, allowing the step bracket to be flush with the pivot frame's surface, minimizing overhang and using thinner bracket attachment members for enhanced support and rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the step bracket is attached to the support plate on the outer surface of the vehicle body frame, then the step bracket can be easily installed, but the step bracket overhangs outward causing interference with the occupant's feet
Solution Approach 1:
The invention transitions from attaching the step bracket to the outer surface (2D surface attachment) to attaching it to a recessed portion of the pivot frame (3D spatial repositioning). By moving the attachment location to a recessed area inside the pivot frame's outer surface, the step bracket no longer overhangs outward, eliminating foot interference while maintaining installation feasibility.
2Object-affected harmful factors
If the step bracket attachment section is recessed inside the pivot frame, then the step bracket can be flush with the pivot frame surface minimizing overhang, but the attachment structure becomes more complex
Solution Approach 1:
The pivot frame is segmented into distinct functional portions: the main pivot frame body, a recessed attachment section (step bracket attachment section), and the step bracket itself. This segmentation allows the attachment section to be positioned independently within the pivot frame structure, enabling flush mounting without requiring complete redesign of the entire pivot frame assembly.
Solution Approach 2:
The step bracket attachment section is nested within the pivot frame structure, with the attachment section positioned inside the pivot frame's outer surface. This nested configuration allows the step bracket to be mounted flush with the pivot frame exterior while keeping the attachment mechanism integrated within the existing structural envelope, avoiding additional external complexity.
3Object-affected harmful factors
If thinner bracket attachment members are used, then the step bracket can be positioned flush with the pivot frame, but the structural strength may be reduced
Solution Approach 1:
The bracket attachment members are designed with non-uniform thickness distribution: thinner sections extend outward from the pivot frame to enable flush positioning of the step bracket, while thicker sections are provided at the attachment interface to the pivot frame to ensure sufficient structural strength. This local quality variation allows the members to serve dual purposes: achieving the design goal of minimal overhang while maintaining adequate connection strength.
Data Source
AI summary
A saddle riding vehicle includes a pivot frame configured to support a swing arm, a step bracket attachment section continuous with a lower side of the pivot frame, and a step bracket attached to an outer surface of the step bracket attachment section outside in a vehicle width direction and configured to support a step, wherein the outer surface of the step bracket attachment section is provided further inside in the vehicle width direction than an outer surface of the pivot frame outside in the vehicle width direction, and an outer surface of the step bracket outside in the vehicle width direction is disposed to be arranged on the same surface as the outer surface of the pivot frame.