Cable Assembly Retention Structures for Strain Relief
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Solution Overview
Problem
Existing strain relief sleeves for electrical cables often fail to properly bond with the cable, leading to sliding or rotation, which compromises their protective function over time.
Innovation Solution
The electric cable assembly incorporates retention structures on the cable jacket, such as grooves, and engagement structures on the sleeve, like protrusions, which securely attach the sleeve to the cable using a die assembly with heaters to form these features during molding, ensuring a stable connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sleeve is molded over a cable to provide strain relief, then the cable is protected from damage, but the sleeve may slide or rotate relative to the cable, compromising its function
Solution Approach 1:
The connection structure is segmented into two complementary parts: retention structures (grooves) on the cable jacket and engagement structures (protrusions) on the sleeve. This segmentation allows each component to be optimized independently while working together to prevent sliding and rotation, resolving the contradiction between reliable retention and simple structure.
Solution Approach 2:
The engagement structures utilize asymmetric geometry where the protrusions on the sleeve fit into the grooves on the cable jacket in a non-symmetric manner. This asymmetric configuration provides mechanical interlocking that simultaneously prevents both sliding and rotation, achieving reliable retention without requiring complex multi-component systems.
2Reliability
If retention structures are added to the cable jacket to prevent sleeve movement, then the sleeve is securely retained, but the manufacturing process becomes more complex
Solution Approach 1:
The retention structures (grooves) are pre-formed on the cable jacket during the cable manufacturing process using a hot stamping tool. This preliminary action integrates the retention feature creation into the existing manufacturing workflow, allowing the structures to be formed without requiring separate complex operations, thus maintaining ease of manufacture while achieving reliable retention.
Solution Approach 2:
The hot stamping process utilizes temporary parameter changes (heat and pressure) to form the retention structures on the cable jacket material. By changing the physical state parameters during formation and then returning to normal conditions, the grooves are permanently created using standard manufacturing equipment, avoiding the need for complex specialized fabrication processes.
3Ease of manufacture
If the sleeve is molded over the cable without engagement structures, then the manufacturing process is simple, but the sleeve may become detached through use
Solution Approach 1:
The engagement structures are designed to be self-forming during the sleeve molding process. The protrusions on the sleeve automatically engage with the grooves on the cable jacket as the material is molded and cooled, without requiring separate assembly operations. This self-service mechanism maintains simple manufacturing while ensuring reliable retention through the mechanical interlocking geometry.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution provides a reliable and durable attachment of the sleeve to the cable, preventing rotation and sliding, thus effectively enhancing the bend relief and stress reduction at the cable connector transition region.
Implementation Method 1
forming one or more retention structures at an outer surface of the cable jacket by heating the portion of the cable jacket arranged inside the die assembly and applying pressure on the die assembly
Implementation Method 2
the sleeve may be formed by molding the sleeve over the cable jacket
Data Source
AI summary
An electric cable assembly includes an electric cable having a cable jacket and one or more electrical wires extending through the cable jacket, the cable jacket defining one or more retention structures arranged at an outer surface of the cable jacket; and a sleeve adapted to connect to an electrical connector and surrounding the cable jacket in an area outside the electrical connector, the sleeve including one or more engagement structures engaged with the one or more retention structures, where the engagement of the one or more retention structures with the one or more engagement structures facilitates a retention of the sleeve with the cable jacket.