Rear Door Division Channel Noise Blocking Reinforcement
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Solution Overview
Problem
The existing assembly structure for the division channel in rear vehicle doors allows noise to enter the vehicle due to gaps between the door inner and outer panels, and concentrates load on the bolt fastening portion, leading to potential cracks in the door inner panel.
Innovation Solution
A device with a uniformly shaped upper end portion of the door inner panel for full-length weather strip fitting, a reinforcing plate on the outer surface, and a bracket coupled to the reinforcing plate for mounting the division channel, which includes a wrinkled load distribution portion to prevent cracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bracket is directly fastened to the door inner panel with non-uniform cross section, then the division channel can be mounted, but noise enters through gaps and load concentrates causing cracks
Solution Approach 1:
A reinforcing plate is introduced as an intermediary component between the door inner panel and the bracket. The reinforcing plate has a uniform cross-section that matches the weather strip, allowing the bracket to be mounted on it rather than directly on the non-uniform door inner panel. This mediator resolves the contradiction by enabling noise blocking through continuous weather strip coverage while providing a suitable mounting surface for the bracket.
Solution Approach 2:
The mounting structure is segmented into multiple components: the door inner panel, the reinforcing plate, and the bracket. This segmentation allows each component to fulfill its specific function - the reinforcing plate provides a uniform mounting surface and load distribution, while the bracket mounts the division channel, and the weather strip provides continuous noise blocking along the entire upper end portion.
2Reliability
If the weather strip is cut before the bracket position, then the bracket can be fastened, but noise enters through the gap at the cut position
Solution Approach 1:
The reinforcing plate serves as a mediator that extends the uniform surface beyond the bracket position. This allows the weather strip to continue uninterrupted past the bracket location, maintaining noise blocking performance while still enabling proper bracket fastening at its designated position.
3Strength
If the bracket is directly fastened to the door inner panel, then mounting is simpler, but load concentrates at the fastening portion causing cracks
Solution Approach 1:
The reinforcing plate acts as a mediator that distributes the concentrated load from the bracket fastening across its larger surface area. This intermediate structure prevents stress concentration at any single point on the door inner panel, thereby preventing cracks while maintaining the mounting functionality.
Solution Approach 2:
The reinforcing plate extends the mounting interface from a point contact (bracket to door panel) to a surface contact (bracket to reinforcing plate). This dimensional expansion distributes the load across the plate's surface area rather than concentrating it at the fastening points, enhancing strength while adding minimal structural complexity.
Data Source
AI summary
A device for blocking noise at a division channel of a rear door for a vehicle may include a door inner panel having an upper end portion formed with a substantially uniform cross-sectional shape, an inside weather strip fastened over an entire length of the upper end portion of the door inner panel, a reinforcing plate mounted on an outer surface of the door inner panel, and a bracket fixedly coupled to the reinforcing plate for mounting the division channel.