Seat Cushion Support Mechanism for Vibration and Impact Absorption
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Solution Overview
Problem
Existing seat cushioning systems in transportation equipment, such as automobiles, aircraft, and ships, face limitations in vibration and impact absorption characteristics, particularly during normal driving and larger load fluctuations.
Innovation Solution
A seat cushioning member support mechanism featuring a first spring-damping mechanism and a second spring-damping mechanism arranged in series, connected via a link, with a front and rear torsion bar system and damping members to enhance vibration and impact absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single spring-damping mechanism is used to support the cushioning member, then the structure is simple, but the vibration and impact absorption characteristics are insufficient
Solution Approach 1:
The cushioning member support mechanism is divided into two independent spring-damping mechanisms (first and second) that operate in parallel. Each mechanism consists of separate spring elements and damping members that can independently absorb vibrations and impacts, thereby improving overall reliability without excessive structural complexity
Solution Approach 2:
The support mechanism combines different types of elastic elements (first and second springs) with damping members to create a composite system. This composite structure leverages the complementary properties of different materials and mechanisms to achieve superior vibration and impact absorption characteristics
2Force
If the spring constant is decreased to improve comfort and stroke feeling, then the vibration absorbing characteristic during normal driving is improved, but the impact absorbing characteristic under large load fluctuations deteriorates
Solution Approach 1:
The damping members are designed to provide variable damping forces that automatically adjust based on the magnitude of applied loads. During normal driving with small vibrations, the damping force is relatively low to maintain comfort. During impact conditions with large load fluctuations, the damping force increases automatically to provide adequate impact absorption
Solution Approach 2:
The system changes the effective spring constant and damping parameters dynamically based on operating conditions. The damping members alter the mechanical properties of the support mechanism in response to different vibration and impact magnitudes, optimizing performance across various driving scenarios
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 system improves vibration and impact absorption characteristics by decreasing the total spring constant and increasing damping, resulting in a nonlinear Duffing-type characteristic, effectively managing both low-frequency and high-frequency vibrations.
Implementation Method 1
a first spring-damping mechanism to which displacement serving as a trigger is input; and a second spring-damping mechanism which exhibits a spring-damping characteristic according to the displacement input to the first spring-damping mechanism
Implementation Method 2
the first spring-damping mechanism and the second spring-damping mechanism are arranged in a stack direction and connected to each other via a link
Implementation Method 3
exhibits a spring-damping characteristic according to the displacement input
Implementation Method 4
torsion bar units each including a torsion bar, arms coupled to the torsion bar and rotatably supported on the torsion bar as a fulcrum
Data Source
AI summary
A sheet cushioning member includes front links coupled to a front torsion bar and rear links coupled to a rear torsion bar are arranged at a predetermined interval from each other in a front and rear direction of a seat, and when a predetermined load or larger is applied, the front links and the rear links rotate in opposite directions, and dampers are disposed to extend between lower portions of the front links and the rear links. When a predetermined load fluctuation or larger occurs, the dampers expand or contract to exhibit a damping force, and a load fluctuation smaller than this does not cause the dampers to expand or contract and is alleviated by elasticity of the front torsion bar and the rear torsion bar. An impact absorbing characteristic is thereby improved with a simple structure.