Chevron Slit Dash Silencer Mounting Structure
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Solution Overview
Problem
Conventional dash silencer mounting methods using round, cross-shaped, or chevron-shaped cuts face issues with sagging and sound-blocking performance degradation due to tearing and movement, and chevron-shaped slits are difficult to locate for precise mounting.
Innovation Solution
A chevron-shaped slit is formed in the dash silencer with a lower portion inflecting toward the passenger compartment, creating a stepped shape, and a stud pin is inserted through this slit for mounting, with a metal die forming the slit to ensure precise alignment and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a chevron-shaped slit is formed in the dash silencer, then the tearing and deformation are minimized, but the fiber surface is fluffy and the location of the slit is difficult to see with the naked eye, making mounting operations difficult
Solution Approach 1:
A guide pin is introduced as an intermediary tool to facilitate mounting. The guide pin has a diameter slightly smaller than the chevron-shaped slit, allowing it to be easily inserted while providing visual guidance for alignment. This mediator bridges the gap between the difficult-to-see slit and the mounting operation, making the process easier without compromising the integrity of the slit
Solution Approach 2:
The guide pin is made with a color different from the dash silencer material, creating visual contrast that makes it easily visible against the fluffy fiber surface. This color differentiation solves the problem of locating the slit position by providing a clear visual marker during mounting operations
2Ease of operation
If a round hole is formed to accommodate a stud pin, then the installation operation is easy, but the dash silencer can easily move from side to side even after mounting
Solution Approach 1:
The chevron-shaped slit replaces the symmetric round hole with an asymmetric geometry that provides directional stability. The angled sides of the chevron shape prevent lateral movement of the dash silencer while still allowing easy insertion of the guide pin and stud pin along the intended mounting axis
Solution Approach 2:
The mounting system is segmented into multiple components: the chevron-shaped slit in the dash silencer, the guide pin for alignment, and the stud pin for securing. This segmentation allows each component to perform its specific function - the slit provides stable positioning, the guide pin enables easy alignment, and the stud pin ensures secure mounting
3Ease of operation
If the cut is made slightly larger than the diameter of the stud pins, then the installation operation is easy, but the cut can be torn and widened by the weight or vibration of the dash silencer
Solution Approach 1:
The guide pin is inserted before the final stud pin mounting to pre-establish the correct position and orientation. This preliminary action ensures that the stud pin is accurately positioned within the chevron-shaped slit, preventing tearing and widening that would occur if the stud pin were forced into a larger, less precise opening
Solution Approach 2:
The guide pin serves as an intermediary that protects the chevron-shaped slit from direct stress during mounting. By guiding the stud pin into place, it prevents the stud pin from directly contacting and potentially tearing the slit edges, thereby maintaining cut dimension stability
Data Source
AI summary
In order to mitigate transmission to the passenger compartment of noise generated in the engine compartment, a dash silencer is installed on the passenger-compartment-side surface of the dash panel of an automobile, wherein the mounting operation is facilitated by improving the mounting structure for the dash silencer. A stud pin is provided to the passenger-compartment-side surface of the dash panel, a chevron-shaped slit is formed in the mat-shaped dash silencer, and the stud pin is inserted through the slit, whereby the dash silencer is mounted on the passenger-compartment-side surface of the dash panel, wherein, when the chevron-shaped slit is formed in the dash silencer, a lower portion separated by the slit is caused to project farther than the upper portion toward the passenger compartment, and the lower portion is caused to inflect into the passenger compartment so as to form a stepped shape.