Vehicle Belt Molding Fiber Contact Structure for Window Noise
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Solution Overview
Problem
Conventional belt moldings for vehicle windows generate abnormal noise due to high frictional resistance and stick-slip phenomena, and existing solutions increase manufacturing costs or require complex fiber material variations to optimize noise reduction.
Innovation Solution
A belt molding with a contact portion featuring 100 to 600 fibers/mm², where the fibers are densely packed to reduce noise but flexible enough to prevent stick-slip, using a strip-shaped sheet member with pre-attached fibers to ensure uniform density and material consistency across sealing portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If numerous fibers are attached at the contact portion to reduce frictional resistance, then abnormal noise is reduced, but manufacturing cost increases due to additional coating processes
Solution Approach 1:
The invention changes the physical parameters of the fibers by specifying a length range of 0.3 to 1.0 mm and an attached density of 100 to 600 fibers/mm². This parameter optimization allows the fibers to achieve optimal bending flexibility and noise reduction performance without requiring additional coating processes, thereby reducing manufacturing costs while maintaining effectiveness.
Solution Approach 2:
The invention uses simple, uncoated fibers that are cost-effective and do not require expensive low-friction agent coatings. By relying on the inherent properties of the fibers (length and density) rather than additional material treatments, the solution reduces manufacturing complexity and cost.
2Object-affected harmful factors
If fibers are coated with low friction agent to reduce friction, then abnormal noise is suppressed, but the coating wears over time and friction reducing effect decreases
Solution Approach 1:
The fibers serve their own function of reducing friction and suppressing noise through their inherent physical properties (length and density) without requiring external coatings. The fibers themselves provide the noise reduction effect through controlled bending, eliminating the need for wear-prone low-friction agent coatings.
Solution Approach 2:
By optimizing fiber length (0.3 to 1.0 mm) and attached density (100 to 600 fibers/mm²), the invention creates a self-sufficient system where the fibers' physical parameters enable them to reduce noise through bending flexibility without relying on degradable coating materials.
3Object-affected harmful factors
If different fiber materials, lengths or thicknesses are attached to each sealing portion to optimize elastic contact state, then abnormal noise is suppressed, but device complexity and productivity decrease
Solution Approach 1:
The invention applies a universal approach by using the same fiber specifications (length: 0.3 to 1.0 mm, attached density: 100 to 600 fibers/mm²) across all sealing portions. This standardized fiber configuration effectively suppresses abnormal noise throughout the entire belt molding without requiring complex variations in fiber materials, lengths, or thicknesses for different portions.
Solution Approach 2:
The invention employs homogeneous fiber properties across all contact portions, using consistent fiber length and attached density specifications. This homogeneity simplifies the manufacturing process and maintains uniform noise reduction performance across all sealing portions without the complexity of differentiated fiber configurations.
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
Effectively suppresses abnormal noise generation by moderating fiber density for optimal bending and reducing static electricity, allowing for stable noise reduction without complex material variations or increased costs.
Implementation Method 1
The belt molding is in elastic contact with the window pane (pressure contact in an elastically deformed state) to seal between the vehicle body panel and the window pane
Implementation Method 2
the frictional resistance between the belt molding and the window pane is reduced, and the generation of abnormal noise is suppressed
Implementation Method 3
it is also effective in reducing static electricity between the belt molding and the window pane
Data Source
AI summary
A belt molding which is capable of easily and stably suppressing the generation of abnormal noise when coming into sliding contact with a window pane. Each of belt moldings is configured to be mounted along a lower edge of a window opening of a vehicle door and come into sliding contact with the window pane which is raised and lowered in the window opening. Each of the belt moldings includes body portions configured to be mounted to door panels of the vehicle door and sealing portions configured to be in elastic contact with the window pane. The sealing portions includes contact portions at the portions configured to be in contact with the window pane, respectively. The contact portions have fiber layers formed by attaching numerous fibers, respectively. Attached density of fibers in the fiber layers is 100 to 600 fibers/mm2.