Seat Core Ridge Structure for Quiet Cushion Sliding
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Solution Overview
Problem
Existing seat designs with hard synthetic resin foam core members and soft synthetic resin foam cushion layers experience rubbing sounds due to the stick-slip phenomenon, which are difficult to reduce effectively, especially when sliding occurs between the seat core member and the cushion layer, particularly with materials having high friction coefficients.
Innovation Solution
A seat core member with ridges extending in the rising direction, formed from polypropylene-based resin foam, and a cushion layer from polyurethane-based resin foam, where the ridges are parallel, long, and tapered, reducing the contact area and promoting vertical sliding to minimize rubbing sounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hard synthetic resin foam seat core member and a soft synthetic resin foam cushion layer are used, then structural strength and cushioning comfort are improved, but rubbing sounds are generated due to the stick-slip phenomenon during sliding
Solution Approach 1:
The invention applies a specific surface structure (protrusions and recesses) only to the contact surface between the seat core member and cushion layer, where the rubbing sound problem occurs. This localized modification does not change the overall material properties or structural strength, but specifically addresses the noise issue at the interface where sliding occurs during seat deformation.
Solution Approach 2:
The invention uses protrusions with curved or rounded surfaces instead of flat contact surfaces. The curved geometry of the protrusions reduces the contact area and modifies the sliding interaction between the seat core member and cushion layer, thereby suppressing the stick-slip phenomenon that causes rubbing sounds while maintaining the necessary structural support.
2Ease of operation
If a flat surface is used for ease of cleaning, then ease of operation is improved, but abnormal noise is generated due to rubbing during vehicle vibration
Solution Approach 1:
The invention introduces a localized surface structure (protrusions and recesses) specifically at the contact interface between the seat core member and cushion layer, while the outer surfaces of the seat can remain smooth for ease of cleaning. This localized modification targets only the area where rubbing noise occurs during vehicle vibration, without compromising the overall ease of maintenance of the seat.
3Stability of the object's composition
If the cushion layer and seat core member adhere strongly, then stability is improved, but rubbing sounds are generated during deformation due to restricted sliding
Solution Approach 1:
The invention uses protrusions with curved surfaces that allow controlled sliding between the cushion layer and seat core member during seat deformation. The curved geometry enables the layers to move relative to each other more smoothly, reducing the stick-slip phenomenon and rubbing sounds, while the interlocking protrusion-recess structure maintains sufficient adhesion stability to prevent excessive separation or instability.
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 solution effectively reduces rubbing sounds during seating and deformation without impairing the cushioning properties, promoting vertical sliding and preventing twisting or lateral shifts, thus enhancing the comfort and quietness of the seat.
Implementation Method 1
rubbing sounds due to the stick-slip phenomenon, which are difficult to reduce effectively, especially when sliding occurs between the seat core member and the cushion layer, particularly with materials having high friction coefficients
Data Source
AI summary
A seat core member of a seat portion provided with the seat core member made of a hard synthetic resin foam and a cushion layer made of a soft synthetic resin foam and covering the seat core member is provided, and the seat core member includes a plurality of ridges extending in a rising direction of the seat core member in a rising portion of the seat core member being in contact with the cushion layer and opposing to calves of a body is formed.