Vehicle Seat Back Frame with Tensile Element for Impact Absorption
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Solution Overview
Problem
Vehicle seats with high rigidity back frames absorb impact poorly, while those with high elasticity lack sufficient rigidity, and existing headrest mechanisms either compromise comfort or fail to adequately protect the neck during rear collisions.
Innovation Solution
A vehicle seat design featuring a back part frame that can elastically deform, with a tensile structural element stretching between side frames to form a backrest, and a headrest that moves forward due to tensile force from a load on the backrest, enhancing both vibration and impact absorption while maintaining comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thick type back part frame with high rigidity is used, then the structural strength is improved, but impact absorption capability deteriorates and vibration absorbing characteristics worsen
Solution Approach 1:
The patent changes the rigidity parameter of the back part frame by introducing a variable rigidity structure. The frame includes a first back part frame with high rigidity and a second back part frame with low rigidity, allowing the structure to provide strength where needed while maintaining compliance for impact absorption. This parameter change enables the frame to exhibit different mechanical properties under different loading conditions.
Solution Approach 2:
The back part frame is segmented into multiple sections with different rigidity characteristics. The first back part frame (upper section) provides high rigidity for structural support, while the second back part frame (lower section) provides low rigidity for impact absorption. This segmentation allows each portion to perform its specific function optimally, resolving the contradiction between overall strength and localized compliance.
2Object-affected harmful factors
If a thin type back part frame with high elasticity is used, then vibration absorbing characteristics are improved, but rigidity becomes insufficient for collision protection
Solution Approach 1:
The patent applies parameter changes by creating a variable rigidity back part frame structure. The first back part frame maintains high rigidity for collision protection, while the second back part frame has low rigidity for vibration absorption. This parameter differentiation allows the structure to provide both rigidity and compliance in appropriate locations, resolving the contradiction between strength and vibration absorption.
Solution Approach 2:
Different portions of the back part frame are assigned different rigidity qualities based on their functional requirements. The upper portion (first back part frame) has high rigidity for structural integrity and collision protection, while the lower portion (second back part frame) has low rigidity for vibration absorption and comfort. This local quality differentiation resolves the contradiction by providing appropriate properties in specific locations.
3Object-affected harmful factors
If a headrest mechanism that moves forward during rear collision is implemented, then neck protection is improved, but normal sitting comfort deteriorates due to occupant contact with the mechanism
Solution Approach 1:
The headrest mechanism is designed to be dynamic rather than static. During normal seating, the headrest remains in a retracted position that does not contact the occupant, ensuring comfort. During rear collision, the mechanism dynamically moves the headrest forward to provide neck protection. This dynamic behavior resolves the contradiction by providing different states for different operational conditions.
Solution Approach 2:
The headrest mechanism is pre-configured to move forward automatically upon detection of rear collision forces. The structure includes a movable headrest assembly that can be rapidly repositioned from a comfortable retracted state to a protective extended state. This preliminary action capability allows the system to maintain comfort during normal use while being ready to provide protection when needed.
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 seat achieves excellent vibration and impact absorption, effectively protecting the neck during rear impacts without impairing normal sitting comfort by controlling the damping ratio and moving the headrest forward to reduce rearward head movement.
Implementation Method 1
a back part frame which is capable of being elastically deformed in the direction in which right and left side part frames are brought closer to, or moved away from, each other
Implementation Method 2
a tensile structural element which is stretched across the back part frame to configure a backrest, and which causes the back part frame to be deformed such that the headrest is moved forward due to a tensile force which is produced by a load imparted to the backrest
Data Source
AI summary
A seat includes a back part frame which is elastically deformable in a direction such that right and left side part frames are brought closer to, or moved away from, each other, and a tensile structural element which is stretched between the right and left side part frames so as to configure a backrest. Further, a headrest is provided at an upper part of the back part frame. In addition, the tensile structural element is stretched over the back part frame so as to configure a backrest, and is configured such that the back part frame is deformed so that the headrest is moved forward due to a tensile force resulting from a load imparted on the backrest.