Vehicle Seat Dynamic Damper With Sheet-Wrapped Polyhedron Weight
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Solution Overview
Problem
The existing seat device for vehicles faces challenges in achieving stable damping performance due to complex molding processes and low positioning precision, leading to uneven elastic member thickness and inconsistent spring constants, which increases costs and complicates the manufacturing of dynamic dampers.
Innovation Solution
A seat device design featuring a polyhedron weight covered by a sheet-shaped elastic member, where the elastic member is molded to a desired thickness and wrapped around the weight without overlapping, with opposite end parts opposing each other to prevent thickness increase and ensure stable damping characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the elastic member is molded integrally with the outer periphery of a weight, then the damping performance is improved, but the molding device becomes complicated and the molding cost increases
Solution Approach 1:
The elastic member is segmented into multiple sheet-shaped members that are wrapped around the weight separately, rather than being molded as a single integral piece. This segmentation simplifies the molding process and reduces device complexity while maintaining the damping function.
Solution Approach 2:
The patent uses sheet-shaped elastic members (thin films) wrapped around the weight to provide the damping function. This approach replaces the complex integral molding with simpler sheet wrapping, reducing manufacturing complexity while achieving the same damping effect.
2Manufacturing precision
If positioning means is employed for holding the weight at a predetermined position in a mold cavity, then the positioning precision is improved, but the molding device becomes complicated and the molding cost increases
Solution Approach 1:
The weight is pre-positioned on the sheet-shaped elastic member before the final assembly, ensuring proper positioning without requiring complex positioning means during the molding process. This preliminary arrangement simplifies the molding device while maintaining positioning accuracy.
3Ease of manufacture
If the positioning precision for the weight is low, then the molding process is simplified, but the thickness of the elastic member becomes non-uniform and the spring constant changes
Solution Approach 1:
The sheet-shaped elastic members are wrapped around the weight in a flexible manner, allowing them to conform to the weight's position without requiring high positioning precision. The flexibility of the sheets compensates for positioning variations while maintaining relatively uniform thickness.
Solution Approach 2:
The sheet-shaped elastic members can dynamically adjust to the weight's position, providing a self-adjusting mechanism that maintains thickness uniformity even when positioning precision varies. This dynamic adaptation eliminates the need for extremely precise positioning during molding.
4Reliability
If the sheet-shaped elastic member is wrapped around the weight with overlapping end parts, then the coverage is improved, but the thickness increases and the spring constant becomes unstable
Solution Approach 1:
The sheet-shaped elastic members are designed with asymmetric wrapping where the end parts overlap to a controlled extent, creating an asymmetric thickness distribution that maintains stability while providing adequate coverage. This controlled asymmetry optimizes both coverage and spring constant consistency.
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 enables the production of dynamic dampers with stable damping characteristics at a lower cost, prevents damage to the elastic member, reduces abnormal noise, and enhances ride comfort by effectively absorbing vibrations while maintaining a compact and durable structure.
Implementation Method 1
an elastic member which is formed into a sheet shape and covers the weight
Implementation Method 2
the weight is covered and supported by the sheet-shaped elastic member... enables the production of dynamic dampers with stable damping characteristics
Data Source
AI summary
A seat device for a vehicle is provided in which a dynamic damper is formed of a weight and an elastic member supporting the weight so as to be capable of vibrating, and the elastic member is retained on a frame or a cushion member of a seat installed in the vehicle, wherein the weight is formed into a polyhedron whereas the elastic member is formed into a sheet shape, and the weight is covered and supported by the sheet-shaped elastic member. This enables the weight to be supported simply by the elastic member, and the dynamic damper to be provided at low cost.