Vehicle Seat Side Frame Layout for Rear-Collision Load Absorption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vehicle seat designs fail to effectively suppress damage to on-board objects during rear collisions due to interference between side frame deformations, leading to incomplete absorption of collision energy and potential damage to stored items like secondary batteries or fuel cells.
Innovation Solution
The vehicle seat design features a cushion frame and back frame with side frames that include base and eccentric portions, where the eccentric portions have lower bending rigidity than the base, allowing for opposite deformation directions to prevent interference and efficiently absorb collision energy by bending at specific connection points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If each side frame is configured to deform outward in the right-left direction during rear collision, then the load can be inhibited from acting on the on-board object, but the deformations of the respective side frames interfere with each other, causing the deformation to stop and reducing protection effectiveness
Solution Approach 1:
The patent applies asymmetry by configuring the left and right side frames with opposite deformation characteristics. Specifically, one side frame has an eccentric portion that causes inward deformation while the other has outward deformation, creating asymmetric deformation patterns that prevent mutual interference between the two side frames during collision
Solution Approach 2:
The patent inverts the conventional approach by having side frames deform in opposite directions rather than both deforming in the same direction. This inversion strategy allows the side frames to deform independently without interfering with each other, thereby maintaining continuous deformation capability throughout the collision process
2Strength
If the side frames are made rigid to maintain structural integrity, then the seat can support normal loads, but the rigid structure cannot sufficiently deform to absorb collision energy, allowing load transmission to the on-board object
Solution Approach 1:
The patent applies local quality by creating regions of different rigidity within the side frame structure. The side frame includes both high-rigidity base portions for maintaining structural integrity and low-rigidity eccentric portions for energy absorption through deformation. This local differentiation allows the structure to simultaneously achieve strength and energy absorption capabilities
Solution Approach 2:
The patent changes the rigidity parameter of different portions of the side frame by varying the cross-sectional dimensions and configurations. The base portion has larger cross-sectional dimensions providing high rigidity, while the eccentric portion has smaller dimensions providing low rigidity, enabling controlled deformation for energy absorption
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design ensures that the vehicle seat effectively inhibits the transmission of collision loads to on-board objects by allowing the side frames to deform in opposite directions, thereby enhancing the absorption of collision energy and reducing the risk of damage to stored items.
Implementation Method 1
an eccentric portion which is eccentric inward or outward in the right-left direction with respect to the base portion in the storage state and for which rigidity against bending in the right-left direction is set so as to be lower than that of the base portion
Data Source
AI summary
A vehicle seat that can suppress damage to an on-board object is provided. In each side frame of a cushion frame, an eccentric portion is eccentric outward in a right-left direction with respect to a base portion, and in each side frame of a back frame, an eccentric portion is eccentric inward in the right-left direction with respect to a base portion. Thus, when the load at the time of rear collision acts, each side frame of the cushion frame easily becomes deformed outward in the right-left direction, and each side frame of the back frame easily becomes deformed inward in the right-left direction. Accordingly, the deformation direction of each side frame of the cushion frame and the deformation direction of each side frame of the back frame can be easily made opposite to each other, and the deformations of the respective side frames and can be inhibited.