EV Chassis Rails Direct Floor Attachment
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Solution Overview
Problem
Electric vehicles face challenges in protecting critical components during side-impact collisions due to the dispersion of these components throughout the vehicle, rather than being centralized in the engine bay like internal combustion engine vehicles.
Innovation Solution
A chassis design featuring longitudinally extending rails that are directly attached to the vehicle floor without intervening structures, allowing for a wider frame configuration that positions critical systems, such as batteries and the electronic drive system, between the rails for enhanced protection and flexibility in accommodating various battery sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If critical components are distributed throughout the vehicle, then component protection is improved, but vehicle structural complexity increases
Solution Approach 1:
The patent merges the protection function for multiple critical components into a single centralized structure - the chassis cavity formed by longitudinal rails. Instead of distributing protection mechanisms throughout the vehicle, all critical components (batteries, electronic drive system, etc.) are housed within this unified protected space, simplifying the overall vehicle structure while maintaining comprehensive component protection.
2Ease of manufacture
If chassis rails are directly connected to floor, then manufacturing complexity is reduced, but floor height increases
Solution Approach 1:
The patent extracts the floor height increase as a separate, acceptable consequence from the manufacturing simplification process. By directly connecting chassis rails to the floor without intermediate structures, the patent eliminates complex assembly steps and intermediate components, accepting that floor height will increase as a trade-off that can be managed through overall vehicle design.
3Reliability
If critical components are centralized between rails, then protection during side-impact collisions is improved, but accessibility for maintenance deteriorates
Solution Approach 1:
The patent segments the protected cavity into manageable sections along the longitudinal rails, allowing critical components to be accessed sequentially. The rail structure itself acts as a segmented framework that can be accessed at multiple points along its length, enabling maintenance personnel to reach components without compromising the overall protective enclosure.
Data Source
AI summary
An electronic vehicle is disclosed with a vehicle body having a cab portion and a rear cargo portion. The rear cargo portion includes a floor comprising a plurality of floor planks. The vehicle includes a chassis with a first rail and a second rail extend along a longitudinal axis of the vehicle body. There are one or more connection points between the first rail, second rail, and the floor such that at least a portion of the first and second rail are adjacent the floor without any interposed structure therebetween.