Electric Motorcycle Seat Frame Bridge Structure
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Solution Overview
Problem
Existing electric motorcycles face challenges in maintaining the bending rigidity of their seat frames, which can lead to deformation and deterioration under the bending loads experienced during travel.
Innovation Solution
The electric motorcycle incorporates a vehicle body frame with a hollow main frame, a seat frame extending in the upper and lower direction, and a bridge frame that connects the seat frame to the main frame, forming a truss structure that enhances the bending rigidity of the seat frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the seat frame is erected independently in an upright state connected only to the seat support portion, then the structure is simple and easy to manufacture, but the bending rigidity of the seat frame deteriorates under traveling loads
Solution Approach 1:
The vehicle body frame is segmented into multiple functional components: the main frame (providing overall structure), the seat frame (supporting the seat), and the bridge frame (connecting seat frame to main frame). This segmentation allows each component to be optimized independently for manufacturing while collectively providing enhanced bending rigidity through their interconnections.
Solution Approach 2:
The bridge frame extends in the front-rear direction (longitudinal dimension) to connect the seat frame to the main frame, adding a dimensional reinforcement that prevents bending deformation. This longitudinal connection creates a rigid triangular structure with the seat frame, significantly improving bending rigidity without complicating the upright erection process.
2Device complexity
If the seat frame is erected independently in an upright state, then the device complexity is low, but the stability and deformation resistance under traveling conditions deteriorate
Solution Approach 1:
The bridge frame merges the seat frame and main frame into a unified rigid structure. By combining these two components through the bridge frame connection, the system achieves enhanced stability and deformation resistance while maintaining relatively simple device complexity. The merged structure forms a stable triangular configuration that resists bending loads during traveling.
3Device complexity
If no bridge frame is provided, then the structure is simple, but the protection of the battery and overall motorcycle stability deteriorate
Solution Approach 1:
The bridge frame acts as an intermediary structural element between the seat frame and main frame. This intermediary component provides critical protection for the battery by reinforcing the main frame structure and preventing deformation that could compromise battery safety. The bridge frame mediates the load transmission path, protecting vulnerable components while maintaining structure simplicity.
Data Source
AI summary
There is provided an electric motorcycle including: a vehicle body frame; a handle disposed above a front wheel; a seat on which an occupant sits. The vehicle body frame includes: a hollow main frame including a handle support portion, a seat support portion disposed behind the handle support portion, and a space extending rearward while being inclined downward from the handle support portion to the seat support portion and that accommodates a battery for a motor; a seat frame extending in an upper and lower direction, and connected to the seat support portion of the main frame at a lower portion; and a bridge frame extending in a front and rear direction, having a rear portion connected to the seat frame and a front portion connected to a portion of the main frame that is located behind the handle support portion.