Backshell With Electromagnetic Protection For Shielded Harnesses
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Solution Overview
Problem
Existing backshells for connecting overall-shielded harnesses with shielded cables to connectors fail to provide adequate electromagnetic interference protection due to gaps between the backshell and clamping ring, leading to high transfer impedance and non-uniform electrical continuity.
Innovation Solution
A backshell design featuring a sleeve with a tubular shape and an attachment ring that slides over the sleeve to cover the shielding terminations, ensuring complete coverage and uniform distribution, with a flared section and through-holes located near the front to minimize electromagnetic interference and enhance electrical continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If shielding terminations are carried on the sleeve with slots extending from the toothed ring to the holes, then the shielding terminations can be accommodated, but the ring is not complete resulting in non-uniform electrical continuity and high contact resistance
Solution Approach 1:
The backshell is divided into two separate components: a complete toothed ring structure and a sleeve with shielding termination slots. The toothed ring maintains full circular continuity for uniform electrical contact, while the sleeve provides dedicated pathways for shielding terminations. This segmentation allows each component to fulfill its function without compromising the other.
Solution Approach 2:
The sleeve acts as an intermediary component between the toothed ring and the shielding terminations. It provides a structured pathway for the shielding wires to pass through and be secured, while the complete toothed ring maintains uniform electrical continuity. The O-ring sealant further mediates by ensuring electrical and environmental sealing across the interface.
2Reliability
If the backshell uses a complete toothed ring for engagement, then uniform electrical continuity is achieved, but the shielding terminations cannot be properly carried
Solution Approach 1:
The backshell is divided into two separate components: a complete toothed ring structure and a sleeve with shielding termination slots. The toothed ring maintains full circular continuity for uniform electrical contact, while the sleeve provides dedicated pathways for shielding terminations. This segmentation allows each component to fulfill its function without compromising the other.
Solution Approach 2:
The sleeve with shielding termination slots is nested within or alongside the complete toothed ring structure. The sleeve passes through or alongside the toothed ring, allowing both components to coexist and fulfill their respective functions - the toothed ring for engagement and electrical continuity, and the sleeve for shielding termination management.
3Ease of operation
If gaps are left between the backshell wall and clamping ring, then the clamping ring can be installed, but electromagnetic interference can pass through these openings
Solution Approach 1:
An O-ring sealant is introduced as an intermediary material between the backshell wall and the clamping ring. This O-ring fills the gaps and crevices that would otherwise allow electromagnetic interference to pass through, while still allowing the clamping ring to be installed and secured. The O-ring maintains both the ease of installation and the electromagnetic shielding effectiveness.
Solution Approach 2:
The O-ring sealant acts as a flexible sealing element that conforms to the interface between the backshell and clamping ring. This flexible seal fills irregular gaps and maintains continuous electromagnetic shielding while accommodating the mechanical assembly of the clamping ring. The flexible nature allows for easy installation while providing effective EMI protection.
Data Source
AI summary
A backshell for connecting an overall-shielded harness including shielded cables to a connector, the backshell including a sleeve having a full toothed ring, a first external area for receiving the terminations of the shielding, and a second external area for receiving the overall-shielding of the harness, the backshell further including an attachment ring having a first internal area and arranged so that it can slide over the sleeve up to an abutment position in which it covers the first external area of the sleeve so as to cover the terminations of the shielding. This backshell is designed to make a terminated shielding harness and a connection protected against EM interference between the terminated shielding harness and a connector.