Vehicle Seat Cushion With Dynamic Vibration Absorber Support
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Solution Overview
Problem
Conventional vehicle seats with three-dimensional solid knit or woven fabrics struggle to achieve optimal elastic characteristics and effectively suppress vibrations, particularly at the head portion of seated individuals.
Innovation Solution
A seat design featuring a frame with a seat material fixed to the frame via an elastic member, supported by a lower-side elastic support member that forms an auxiliary vibration system, separate from the main vibration system, to absorb and dampen vibrations, using a three-dimensional solid knit fabric for the seat material and additional elastic structures for enhanced support and damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a three-dimensional solid knit fabric or two-dimensional woven fabric is stretched over the frame for the sitting portion, then the seat achieves good elastic characteristic and cushionability, but the seat cannot effectively suppress vibrations, particularly at the head portion
Solution Approach 1:
The seat is divided into multiple functional layers: a seat cushion portion with stretched fabric for basic cushioning, and a separate support member portion positioned below to specifically address vibrations. This segmentation allows each component to optimize its function - the fabric provides elasticity while the support member suppresses vibrations, resolving the contradiction between achieving good elastic characteristics and suppressing vibrations.
Solution Approach 2:
The support member acts as an intermediary element between the seat frame and the stretched fabric. It is disposed at a lower side of the seat material and provides additional vibration suppression without interfering with the elastic characteristics of the fabric. This intermediary component enables the seat to achieve both good cushionability and effective vibration suppression.
2Device complexity
If the seat uses only stretched fabric over the frame, then the structure remains simple, but the damping needed for vibrations and shock cannot be ensured
Solution Approach 1:
The seat structure is segmented into a primary cushioning system (stretched fabric) and a secondary vibration control system (support member). This segmentation adds vibration damping capability while maintaining the simplicity of the original stretched fabric structure for the main cushioning function.
Solution Approach 2:
The support member is positioned at a specific location (lower side of the seat material) where it can effectively contribute to vibration damping without complicating the overall structure. This localized addition provides the necessary damping while keeping the rest of the structure simple and maintaining good elastic characteristics.
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 effectively suppresses head portion vibrations by creating a dynamic vibration absorber system, ensuring damping and restoring force, while maintaining comfort and preventing unpleasant sensations, thereby reducing fatigue and discomfort during long periods of sitting.
Implementation Method 1
an increase in tension accompanying the sitting-down is suppressed by the elastic member elastically deforming
Implementation Method 2
an auxiliary vibration system, whose mass element is the femoral region and which includes (the elastic supporting portion of) the support member in the spring element, is formed separately from a main vibration system
Implementation Method 3
the damping needed for vibrations and shock is ensured
Data Source
AI summary
A seat cushion of a vehicle seat has a base seat whose front end is anchored to a front frame of a frame for a sitting portion, and whose rear end is connected to a rear frame of the frame for a sitting portion via helical tension springs. A supporter, supported via helical tension springs at a pair of left and right side frames of the frame for a sitting portion, is disposed at a lower side of the base seat so as to support a femoral region of a seated person. The supporter and the helical tension springs structure an auxiliary vibration system whose mass element is a femoral region of a seated person. The auxiliary vibration system is made to function as a dynamic vibration absorber with respect to up-down vibrations of a main vibration system whose mass element is an upper body of a seated person.