Glass Run Thick Portion for Wind Noise Reduction
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Solution Overview
Problem
Current techniques for reducing wind noise in vehicles, such as impedance matching in glass runs, are insufficient due to inadequate rigidity and increased weight and cost concerns with thicker door glasses and acoustic glasses.
Innovation Solution
A glass run design with a thick portion of higher hardness on the vehicle inner side, where the thickness of this portion is set between 0.4 to 1.0 times the total thickness, combined with an embedded insert or semi-rigid material in the vehicle outer side wall, enhances rigidity and noise reduction by ensuring effective impedance matching and preventing dust accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the thickness of the thick portion is increased to improve rigidity and noise reduction, then the noise reduction effect is improved, but the weight and manufacturing cost increase
Solution Approach 1:
The patent applies local quality by creating a thick portion with higher hardness than the vehicle-outer-side side wall, concentrating the rigidity enhancement in a specific localized area rather than uniformly thickening the entire glass run. This allows the thick portion (with thickness t1 ≥ 0.4T) to provide sufficient rigidity for impedance matching and noise reduction while keeping the overall structure lighter and more cost-effective.
2Reliability
If a thick portion with higher hardness is formed to improve impedance matching, then vibration dissipation is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent employs composite materials by forming a thick portion with different material properties (higher hardness) than the vehicle-outer-side side wall within the same glass run structure. This composite approach enables effective impedance matching between the door glass and glass run, ensuring efficient vibration dissipation while maintaining a relatively simple integrated structure that does not require multiple separate components.
3Weight of moving object
If the thick portion is made thinner to reduce weight and cost, then weight and cost are reduced, but the rigidity and noise reduction effect are insufficient
Solution Approach 1:
The patent applies parameter changes by establishing a specific thickness ratio relationship between the thick portion (t1) and the total thickness (T), where t1 ≥ 0.4T. This quantitative parameter specification ensures that the thick portion has sufficient rigidity for effective impedance matching and noise reduction while avoiding excessive thickness that would increase weight and cost. The higher hardness parameter of the thick portion further enhances its rigidity efficiency.
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 enhanced rigidity of the glass run effectively reduces wind noise by ensuring efficient vibration dissipation and maintaining structural integrity while minimizing weight and cost increases.
Implementation Method 1
it has been focused on reducing vibration by utilizing so-called impedance matching, in which a vibration energy of the door glass is efficiently dissipated by making it flow through parts in contact with the door glass
Implementation Method 2
a thick portion 31 that protrudes to a vehicle inner side, is in sliding contact with a door glass 4, and has a higher hardness than that of the vehicle-outer-side side wall 30 is formed on a vehicle inner side of the vehicle-outer-side side wall 30
Data Source
AI summary
A glass run includes: a bottom wall; a vehicle-outer-side side wall; and a vehicle-inner-side side wall. The bottom wall, the vehicle-outer-side side wall and the vehicle-inner-side side wall configure a basic framework being attached to a door frame groove portion formed in a door frame. The glass run guides an up and down movement of a door glass. A thick portion that protrudes to a vehicle inner side, is in sliding contact with the door glass, and has a higher hardness than that of the vehicle-outer-side side wall is formed on a vehicle inner side of the vehicle-outer-side side wall. When a thickness of the thick portion is set to t1 and a sum of thicknesses of the thick portion and the vehicle-outer-side side wall is set to T, t1 is 0.4 T or more and 1.0 T or less.