Automobile Glass Run Barrier Rib Noise Insulation
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Solution Overview
Problem
Conventional glass runs in automobiles fail to effectively prevent noise transmission from the interior of the door into the vehicle compartment during operation, leading to discomfort for passengers.
Innovation Solution
The glass run features extruded and molded parts with a U-shaped cross-section, including outer and inner seal lips and a barrier rib, which are designed to change cross-sectional shapes to fit the door frame, securely hold the door glass, and prevent noise intrusion by forming barrier gaps that flex to ensure sound insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the glass run has open ends to allow door glass movement, then the door glass can be raised and lowered smoothly, but noise transmits from the door interior to the vehicle compartment
Solution Approach 1:
The patent introduces a flexible noise prevention film that can be attached to the inner peripheral surface of the glass run. This thin film creates a barrier against noise transmission while allowing the glass run to maintain its open-end structure for door glass movement. The film's flexibility ensures it does not interfere with the mechanical operation of the door glass.
Solution Approach 2:
The noise prevention film acts as an intermediary element between the glass run structure and the noise source. It is positioned within the glass run to block noise transmission paths without interfering with the primary function of guiding door glass movement. The film mediates between the conflicting requirements of operational openness and noise isolation.
2Object-affected harmful factors
If a noise prevention film is attached to the inner peripheral surface, then noise transmission is reduced, but the film may interfere with door glass movement
Solution Approach 1:
The patent specifies using a flexible noise prevention film that can deform and adapt to the movement of the door glass. This flexibility ensures the film maintains its noise-blocking function while accommodating the dynamic operation of the door glass without creating excessive friction or resistance.
Solution Approach 2:
The patent addresses the need to control the physical parameters of the film, such as its thickness, flexibility, and surface properties, to optimize both noise prevention and operational smoothness. By adjusting these parameters, the film can effectively block noise while minimizing interference with door glass movement.
3Ease of manufacture
If the glass run structure is simplified, then manufacturing cost is reduced, but noise insulation performance deteriorates
Solution Approach 1:
The patent divides the noise prevention function into a separate, attachable film component rather than integrating it into the main glass run structure. This segmentation allows the glass run to maintain its simple, easy-to-manufacture form while the noise prevention film provides the necessary acoustic isolation. The film can be attached separately without complicating the glass run manufacturing process.
Solution Approach 2:
The noise prevention film serves as an intermediary solution that adds noise insulation functionality without requiring changes to the basic glass run structure. This approach maintains manufacturing simplicity while achieving improved noise insulation through the addition of a specialized functional layer.
Data Source
AI summary
A glass run capable of preventing noises from intruding into an automobile compartment from an interior of an automobile door via glass runs during running of an automobile. The glass run includes extruded parts and molded parts. Each of the extruded parts and the molded parts has a bottom wall, an outer side wall, and an inner side wall, which define a generally U-shaped cross-section. An outer seal lip and an inner seal lip respectively extend from open ends of the outer side wall and the inner side wall towards the interior of the glass run. A barrier rib is formed in at least one position of the molded parts between the inner side wall and the inner seal lip or between the outer side wall and the outer seal lip.