Cable Bushing With Clamping Projections For Strain Relief
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Solution Overview
Problem
Existing bushings for electrical lines in vehicles fail to provide long-term strain relief due to loosening of sealing elements caused by temperature fluctuations and vibrations, which compromises moisture-tight sealing and secure cable fixation.
Innovation Solution
A bushing design featuring an extension and clamping body with projections that securely locks the cable in place, ensuring stable positioning under tensile loads and independent of temperature fluctuations and vibrations, allowing for easy installation and removal, and accommodating cables of different diameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing elements are used to ensure moisture-tight sealing, then moisture protection is improved, but strain relief deteriorates due to loosening during operation
Solution Approach 1:
The adapter is divided into functionally independent parts: a sealing element for moisture protection and a clamping body with projections for strain relief. This segmentation allows each component to perform its specific function without interfering with the other, resolving the contradiction between maintaining sealing integrity and providing stable strain relief.
Solution Approach 2:
The sealing element and clamping body are combined into a single adapter assembly that performs both sealing and strain relief functions simultaneously. The clamping body with its projections engages the cable while the sealing element maintains moisture barrier, achieving both reliability and stability through integration.
2Reliability
If sealing elements are used to ensure moisture-tight sealing, then moisture protection is improved, but long-term stability deteriorates due to loosening from temperature fluctuations and vibrations
Solution Approach 1:
By separating the sealing function from the strain relief function into distinct components (sealing element vs. clamping body with projections), the design ensures that the strain relief mechanism is not affected by thermal expansion or vibration-induced loosening that would compromise the sealing element alone over time.
Solution Approach 2:
The sealing element can be replaced independently if it degrades over time, while the clamping body with projections remains as a durable, long-lasting component that maintains strain relief. This allows the short-living sealing element to be maintained without replacing the entire adapter.
3Stability of the object's composition
If the adapter structure is extended to provide strain relief, then strain relief is improved, but device complexity increases
Solution Approach 1:
The extension is localized to specific regions of the adapter where strain relief is needed, rather than redesigning the entire adapter structure. The clamping body with projections is added only at the cable engagement point, maintaining simplicity in other areas while providing enhanced strain relief where required.
Solution Approach 2:
The clamping body with projections is nested within or integrated into the existing adapter structure, with the extension fitting into the overall adapter geometry. This nesting approach adds strain relief functionality without significantly increasing the external dimensions or overall complexity of the adapter assembly.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The bushing has an adapter (A) made of insulating material and fixed at a wall. A flange (4) is screwed at dot and dash indicated areas in the wall in a position, in which a connecting piece (5) passes via a hole. The piece is moisture-proof. The adapter includes a borehole (8) for leading an electrical line (3), where the borehole extends via an extension. Through-holes (13) made in the extension pass from an outer surface (12) to the borehole. A clamping body (15) includes projections (17) which are engaged in the through-holes in a mounting position for clamping arrangement at the line.