Cable Assembly Strain Relief Spring Nesting
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Solution Overview
Problem
Existing cable assemblies with strain relief designs fail to provide sufficient resistance to bending, especially with the miniaturization of electronic devices, as the size and appearance constraints limit the effectiveness of traditional strain relief mechanisms.
Innovation Solution
A cable assembly design featuring a connector, a cover with a blocking mechanism, a spring with restricted ends, and a strain relief structure that includes a through hole and a receiving cavity with a shoulder, where the spring is received in the cavity and the cable runs through the spring and the through hole, providing enhanced bending protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional strain relief is molded on the front end of the cable, then the cable is protected from breaking, but the resistance to bending is insufficient when miniaturization constraints are applied
Solution Approach 1:
The spring is nested within the strain relief structure, with the strain relief receiving cavity accommodating the spring coils. This nested arrangement allows the spring to provide active bending resistance while being contained within a compact molded structure, resolving the contradiction between cable protection and bending resistance under miniaturization constraints
Solution Approach 2:
The spring introduces a dynamic element to the otherwise static strain relief structure. The spring can compress and expand in response to bending forces, actively adapting to provide resistance rather than relying solely on the rigid molded structure. This dynamic response significantly improves bending resistance while maintaining compact dimensions
2Volume of moving object
If the size of the strain relief is reduced to meet miniaturization requirements, then the device becomes more compact, but the flexural test performance deteriorates
Solution Approach 1:
The spring parameters (coil diameter, wire diameter, number of coils, pitch) are optimized to provide maximum bending resistance within the constrained volume of the miniaturized strain relief. By carefully selecting these parameters, the spring delivers sufficient flexural performance despite the reduced overall size of the strain relief structure
Solution Approach 2:
The strain relief structure combines the rigid molded plastic housing with the elastic spring element, creating a composite system that leverages the strengths of both materials. The rigid housing provides structural containment while the elastic spring provides active bending resistance, achieving high flexural performance in a compact package
3Ease of operation
If a spring with small pitch is used, then the tendency to catch on surrounding objects is reduced, but the spring may still move away from the connector
Solution Approach 1:
The blocking structure acts as an intermediary element between the spring and the connector. It provides a mechanical interface that secures the spring in position while allowing it to function, preventing the spring from moving away from the connector without interfering with its bending resistance function or causing it to catch on surrounding objects
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
The design enhances the bending performance of the cable assembly by utilizing a spring with restricted ends and a strain relief structure that prevents the spring from sliding out, offering improved protection against bending forces while maintaining a compact size.
Implementation Method 1
a spring (4) receiving the cable (3)... improving a bending performance of the cable assembly (100)
Data Source
AI summary
A cable assembly includes a connector, a cover enclosing the connector, a strain relief located on the rear end of the cover, a spring, and a cable. The cover includes a blocking. The strain relief is fixed by the blocking. The strain relief defines a through hole and a receiving cavity communicated with the through hole. The through hole has an inner diameter smaller than an inner diameter of the receiving cavity. A shoulder is formed between the through hole and the receiving cavity. The spring is received in the cavity, and has one end restricted by the shoulder and an opposite end restricted by the blocking. The cable is connected to the connector and runs through the spring and the through hole.