Shielded Shell Position Restriction for Grommet Interference
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Solution Overview
Problem
Conventional shielded shells lack a mechanism to prevent the fixing member from shifting forward, which can interfere with the grommet, compromising sealing performance.
Innovation Solution
The shielded shell features a step portion on its outer circumference that increases in diameter from the rear to the front, along with position restriction protrusions to securely position the fixing member, preventing forward shifting and tilting, and ensuring proper alignment with the grommet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the outer circumferential surface is continuous without protrusions or recessions, then the manufacturing process is simple, but the fixing member may shift forward and interfere with the grommet
Solution Approach 1:
The patent applies local quality by providing position restriction portions at specific locations on the outer circumferential surface rather than making the entire surface complex. These localized protrusions or recessions restrict the fixing member's position in the circumferential direction while maintaining simplicity elsewhere on the surface.
Solution Approach 2:
The position restriction portions are built into the shielded shell structure in advance, performing the position-restricting function before the fixing member is installed. This preliminary structural design prevents shifting without requiring additional components or complex assembly steps.
2Object-affected harmful factors
If position restriction portions are provided only on a certain portion in the circumferential direction, then interference with other members is reduced, but the fixing member may become tilted
Solution Approach 1:
The position restriction portions are strategically located only on the rear end portion of the shielded shell in the circumferential direction, creating localized restrictions that prevent tilting without causing interference with the grommet positioned at the front end.
Solution Approach 2:
The patent addresses the tilting prevention by utilizing the axial dimension (front-rear direction) through the step portion, while the position restriction portions work in the circumferential dimension. This multi-dimensional approach prevents tilting without requiring circumferential coverage that would cause interference.
3Ease of operation
If the fixing member is allowed to shift forward, then assembly is more flexible, but sealing performance is compromised
Solution Approach 1:
The position restriction portions are positioned specifically on the rear end portion of the shielded shell, restricting the fixing member's position only where necessary to prevent forward shifting, while leaving the front end area free for proper grommet installation and sealing.
Solution Approach 2:
The step portion and position restriction portions are pre-formed on the shielded shell to establish the correct positioning of the fixing member before assembly is complete, ensuring that sealing components like the grommet are not compromised by subsequent shifting.
Data Source
AI summary
A shielded shell and a shielded connector that prevents a fixing member for fixing a shielding member from interfering with another member such as a grommet. A shielding member such as a braided wire is placed on the outer circumferential surface of a shielded shell and fixed by the fixing member. The outer circumferential surface of the shielded shell is provided with a step portion that increases in diameter from the rear portion, at which a fixing region of the shielding member is positioned, toward a front portion, and is provided with position restriction portions that protrude outward from portions of the outer circumferential surface in the circumferential direction and restrict the position of the front end of the fixing member that is to be attached to the fixing region.