Seat Backrest Bank Structure for Rear-Collision Upper-Body Sinking
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Solution Overview
Problem
The existing vehicle seat backrest designs fail to effectively prevent the reduction of backward sinking of the upper body during a rear-end collision, as the bank parts compress and impair the shock-absorbing effects on the neck region of the occupant.
Innovation Solution
A seat backrest design featuring right and left side frame segments with a pressure receiving member movable in the front-back direction, a cushion pad covering the side frame segments and pressure receiving member, and bank parts with recesses on their rear surfaces to allow for backward bending and retreat, preventing compression and maintaining the ability to sink the upper body backward.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the bank parts are made rigid to support the upper body, then the holding ability is improved, but the backward sinking of the upper body is reduced during collision
Solution Approach 1:
The bank parts are divided into multiple regions with different rigidity characteristics. The front region maintains higher rigidity for holding ability, while the rear region has lower rigidity to allow backward bending and sinking during collision, resolving the contradiction between strength and ease of operation
Solution Approach 2:
Different portions of the bank parts are given different mechanical properties. The front surface maintains structural integrity for support, while the rear surface is designed with reduced rigidity to enable controlled deformation during rear-end collision, allowing both holding ability and backward sinking
2Object-affected harmful factors
If the pressure receiving member is made movable to allow backward retreat, then the shock-absorbing effect is improved, but the structural complexity increases
Solution Approach 1:
The pressure receiving member is designed to be movable rather than fixed, allowing it to retreat backward during rear-end collision. This dynamic capability enables the structure to absorb shock through controlled movement and deformation, improving shock-absorbing effect while maintaining relatively simple structural implementation
Solution Approach 2:
The pressure receiving member is positioned and designed to retreat backward before the main impact force reaches the occupant. This preliminary cushioning action absorbs part of the collision energy, reducing the shock transmitted to the occupant's neck region
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
The design prevents the bank parts from reducing the backward sinking of the upper body, enhancing the shock-absorbing effects and maintaining the occupant's posture by allowing the pressure receiving member to compensate for the reduced holding ability of the bank parts during a collision.
Implementation Method 1
At a rear-end collision by another vehicle, the upper body of the occupant sinks into the cushion pad and the central portion of the cushion pad and the pressure receiving member retreat, thus allowing the headrest to rapidly receive the head of the occupant
Implementation Method 2
the upper body of the occupant sinks into the cushion pad and the central portion of the cushion pad and the pressure receiving member retreat
Implementation Method 3
a recess is formed at an area of a rear surface of each bank part, the area facing a corresponding extending part of the extending parts
Data Source
AI summary
A seat backrest includes right and left side frame segments, a pressure receiving member disposed between the side frame segments movably in a front-back direction, and a cushion pad covering the front of the side frame segments and pressure receiving member. The pressure receiving member includes a main body part, and extending parts extending laterally from both sides of the main body part. The cushion pad includes a back receiving part covering the front of the main body part, and bank parts disposed on both sides of the back receiving part, protruding forward from both sides, and covering the front of the extending parts and side frame segments. A recess is formed at an area, facing a corresponding extending part of the extending parts, of a rear surface of each bank part.