Electric Motorcycle Frame Layout for Battery and Drive Unit Fixation
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Solution Overview
Problem
Existing saddle riding type vehicles face challenges in maintaining a balance between rigidity and flexibility of the vehicle body frame, which affects riding comfort and dynamic performance, particularly in off-road racing scenarios where the frame needs to be moderately bendable to accommodate large jumps and rider movements.
Innovation Solution
The drive unit and battery are fastened to different frames within the vehicle body frame, with the battery secured to the lower frame and the drive unit to the pivot frame, indirectly connecting these components to allow for moderate bending while maintaining stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle body frame is made rigid to securely fix the drive unit and battery, then reliability is improved, but riding comfort and dynamic performance deteriorate due to inability to accommodate frame bending during jumps and rider movements
Solution Approach 1:
The vehicle body frame is segmented into multiple independent frame members (head pipe, main frame, lower frame, pivot frame) that are selectively fastened to the drive unit and battery. This segmentation allows each frame member to bend independently while maintaining overall structural integrity, resolving the contradiction between reliable fixation and frame flexibility.
Solution Approach 2:
Different frame members are assigned different fastening characteristics to the drive unit and battery. The head pipe, main frame, lower frame, and pivot frame are selectively fastened at different locations and with different fastening strengths, creating local variations in rigidity that allow the frame to bend in specific areas while maintaining stability at critical points.
2Device complexity
If the drive unit and battery are fastened to the same frame member, then device complexity is reduced, but reliability of fixation deteriorates when the frame bends
Solution Approach 1:
The drive unit and battery are fastened to different frame members (head pipe, main frame, lower frame, pivot frame) rather than the same frame member. This segmentation distributes the fastening loads across multiple independent structural elements, ensuring that bending of one frame member does not compromise the fixation of both components simultaneously.
Solution Approach 2:
The frame members act as intermediaries between the drive unit and battery, providing indirect support and distribution of mechanical stresses. By fastening components to different frame members, the frame structure mediates the forces and movements, preventing direct stress concentration that would occur if both components were fastened to the same location.
Data Source
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AI summary
A saddle riding type electric vehicle (10) includes: a vehicle body frame (18); a drive unit (26) supported by the vehicle body frame (18); and a battery (24) that is supported by the vehicle body frame (18) and supplies electrical power to the drive unit (26). The battery (24) is fastened to a lower frame (46) of the vehicle body frame (18), the drive unit (26) is fastened to a pivot frame (44) of the vehicle body frame (18), and the drive unit (26) and the battery (24) are fastened to each other.