Automotive Side Frame Cab-Mount Bracket Shear Resistance
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Solution Overview
Problem
Conventional automotive vehicle frame structures experience significant shear deformation during frontal collisions, with the shear force concentrating at the joining portions of coupled panels, leading to instability.
Innovation Solution
A frame structure featuring side frames with closed cross sections formed by joined outer and inner panels, where the cab-mount bracket extends inwardly to support the inner panel's lower face, and includes a reinforcement member to enhance rigidity and prevent shear deformation, with specific configurations of U-shaped cross sections and projection portions to distribute forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the side frame is formed by coupled panels joined together, then the structural complexity is reduced and ease of manufacture is improved, but the shear force concentrates at the joining portion causing shear deformation during frontal collision
Solution Approach 1:
The cab-mount bracket extends from the outer panel in the vehicle width direction (first direction) and also projects inward in the vehicle longitudinal direction (second direction perpendicular to the first). This two-dimensional extension creates a spatial structure that distributes shear forces across multiple dimensions, preventing concentration at a single joining portion while maintaining the coupled panel construction
Solution Approach 2:
The extension portion of the cab-mount bracket acts as an intermediary element that connects the outer panel to the inner panel. This intermediate structure transfers and distributes shear forces between the panels, preventing direct force concentration at the joining portion while maintaining the coupled panel construction
2Device complexity
If the cab-mount bracket is attached only to the outer side face of the outer panel, then the device complexity is reduced, but the cross section of the side frame deforms under impact force during frontal collision
Solution Approach 1:
The cab-mount bracket extends not only in the vehicle width direction (first direction) from the outer side face of the outer panel but also projects inward in the vehicle longitudinal direction (second direction perpendicular to the first). This two-dimensional extension creates additional support geometry that restrains cross-sectional deformation while maintaining relatively simple device complexity
Solution Approach 2:
The extension portion of the cab-mount bracket is specifically positioned to reach the inner panel, providing localized reinforcement at the critical inner panel region. This local quality enhancement targets the specific area needing support without requiring complex overall restructuring of the bracket
Data Source
AI summary
A pair of side frames extends longitudinally away from each other in a vehicle width direction, which includes a closed cross section formed by an outer panel having a U-shaped cross section with its vehicle's inward side opening and an inner panel having a U-shaped cross section with its vehicle's outward side opening. A cab-mount bracket is provided on a vehicle-outward side of a front portion of the side frame to support a cabin. The cab-mount bracket includes an upper portion which is joined to a side face of a side portion of the outer panel and extends in an outward direction, and a lower portion which includes an extension portion extending in a vehicle inward direction beyond the side face of the outer panel and be joined to a lower face of a bottom portion of the inner panel.