Chassis Cab Side Sill Structure for Battery Side-Impact Protection
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Solution Overview
Problem
Conventional chassis cab vehicles lack an effective structure to protect batteries from side collisions without increasing weight or degrading connectivity between the upper and lower frames, leading to potential battery damage and reduced support rigidity.
Innovation Solution
A chassis cab vehicle design where the lower frame and upper body are coupled, with side sills extending to the rear of the cabin interior, forming a response structure that overlaps with side members to absorb impact without additional collision members, thereby reducing frame weight and maintaining connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional collision members (fixing brackets, protruding materials) are configured at the outer side to protect the battery from side collision, then battery protection is improved, but vehicle weight increases and frame connectivity is degraded
Solution Approach 1:
The side sill of the upper body is extended to the rear of the cabin interior to merge the upper body structure with the lower frame structure. This integrated side sill acts as a collision member that protects the battery without requiring separate fixing brackets or protruding materials, thereby reducing vehicle weight while maintaining battery protection
Solution Approach 2:
The extended side sill serves multiple functions: it maintains the structural integrity of the upper body, provides side collision protection for the battery, and enhances frame connectivity. This multi-functional design eliminates the need for dedicated collision protection components, reducing overall vehicle weight
2Reliability
If additional collision members are configured at the outer side to protect the battery, then battery protection is improved, but support rigidity of the lower frame is decreased
Solution Approach 1:
The side sill is merged with the lower frame structure by extending it to the rear of the cabin interior. This integration creates a continuous structural element that enhances support rigidity while providing battery protection, eliminating the need for separate collision members that would compromise frame strength
3Reliability
If a separate protection structure is added to protect the battery, then battery protection is improved, but device complexity increases
Solution Approach 1:
The protection structure is merged into the existing side sill of the upper body, which is extended to the rear of the cabin interior. This eliminates the need for separate protection structures and reduces device complexity while maintaining battery protection
Solution Approach 2:
The extended side sill serves as both a structural component of the upper body and a protection structure for the battery. This multi-functional design simplifies the overall vehicle structure by eliminating dedicated protection components
Data Source
AI summary
A chassis cab vehicle includes a lower frame, which constitutes a lower structure of the vehicle and is equipped with a pair of side members extending in a lengthwise direction of the vehicle. A battery is coupled between the side members. An upper body is coupled to a front portion of the lower frame and forms a cabin interior. A side sill is formed at a lower end at each side of the upper body and extends to a rear side of the cabin interior. The side sills overlap the respective side members in a lateral direction of the vehicle when coupled to the lower frame.