Wire Holding Device Seal Integrity Against Tilt
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Solution Overview
Problem
Existing wire holding devices experience reduced sealing properties due to tilt and drag turning during attachment, allowing water and contaminants to enter the case, as the shield shell and housing can become tilted and enlarge the gap between the housing and the attachment hole.
Innovation Solution
A wire holding device with a separate seal holding member and wire holder that are relatively movable in the circumferential direction, featuring an inner periphery sealing member and outer periphery sealing member to maintain a consistent gap size, preventing tilt and ensuring sealing integrity, even during bolt tightening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shield shell is bolted to the case, then the wire holding device is fixed to the case, but drag turning occurs causing the shield shell to tilt and enlarge the gap between the housing and attachment hole
Solution Approach 1:
The wire holding device is divided into separate components: the shield shell for mechanical fastening and the seal holding member for sealing. This segmentation allows each component to perform its specific function independently, preventing the sealing function from being affected by drag turning of the shield shell during bolting.
Solution Approach 2:
The seal holding member acts as an intermediary between the shield shell and the attachment hole. It is inserted into the attachment hole first, establishing the sealing position before the shield shell is bolted. This intermediary component ensures that the sealing gap remains consistent even when the shield shell tilts during assembly.
2Ease of operation
If the housing is fitted in the attachment hole, then the connector is attached to the case, but the housing tilts together with the shield shell enlarging the gap locally
Solution Approach 1:
The seal holding member is preliminarily inserted into the attachment hole before the shield shell is bolted. This preliminary action establishes the correct positioning and sealing gap before any tilting can occur during the bolting process, ensuring gap uniformity is maintained throughout the attachment operation.
3Reliability
If the terminal is crimped to the electric wire and fixed inside the case, then electrical connection is established, but water and contaminants can enter through the enlarged gap
Solution Approach 1:
The sealing function is extracted from the integrated housing-shield shell structure and assigned to a dedicated seal holding member with sealing members. This extraction ensures that the sealing function is specifically optimized and protected, preventing water and contaminants from entering through gaps while maintaining reliable electrical connections.
Data Source
AI summary
A wire holding device includes a seal holding member provided with an insertion hole into which an electric wire is inserted and which is provided with an opening, the seal holding member being configured to be housed in an attachment hole formed on an attachment target, an outer periphery sealing member for sealing a gap between an inner surface of the attachment target inside the attachment hole and the seal holding member, an inner periphery sealing member for sealing a gap between the electric wire and the seal holding member, and a wire holder aligned with the seal holding member along the electric wire. The seal holding member and the wire holder are relatively movable in a circumferential direction of the electric wire. The opening has such a diameter as to allow an end face of the inner periphery sealing member to be seen through the opening.