Shielded Cable Terminal With Inward Protrusions
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Solution Overview
Problem
Existing shielded cables with terminals face issues of enlargement due to the radial projection of petal-shaped braided wire folding pieces, which compromise the fixing force and increase the size of the assembly.
Innovation Solution
A shielded cable assembly with a braided wire folded portion and a metal sleeve crimped radially, where the terminal barrel has inwardly projecting protrusions that contact the sleeve when the cable is pulled, enhancing the fixing force while minimizing size, and ensuring the protrusions do not damage the core wire or sheath.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a petal-shaped braided wire folding piece projects outward radially to prevent cable withdrawal, then the fixing force is improved, but the assembly size is enlarged
Solution Approach 1:
Instead of projecting the braided wire folding piece outward radially to achieve fixing, the invention inverts the approach by forming protrusions on the barrel that project radially inwardly. These inward-projecting protrusions contact the sleeve from the inside, achieving the same fixing function while eliminating the need for outward radial projection and thus reducing assembly size.
Solution Approach 2:
The invention places the protrusions inside the barrel structure, nested within the terminal assembly. The protrusions are positioned within the barrel's radial space rather than extending outward, effectively nesting the fixing mechanism within the existing structure boundaries, which prevents size enlargement.
2Device complexity
If the braided wire is folded toward the outer sheath to form a folded portion, then the fixing mechanism is simplified, but the sleeve must be precisely positioned inside the folded portion
Solution Approach 1:
The sleeve acts as an intermediary element between the folded braided wire and the barrel. The sleeve is crimped onto the outer sheath at a position that interfaces with both the folded portion and the inward-projecting protrusions, mediating the connection and providing a reliable contact surface that compensates for variations in folded portion thickness.
Solution Approach 2:
The invention changes the geometric parameters of the fixing mechanism by using inward-projecting protrusions instead of outward-projecting structures. This parameter change allows the sleeve to be positioned more flexibly within the folded portion, as the protrusions can contact the sleeve at various positions along its length, reducing the precision requirements for sleeve placement.
3Volume of moving object
If the protrusion projects radially inwardly to contact the sleeve, then the assembly size is reduced, but the protrusion may contact and damage the core wire or outer sheath
Solution Approach 1:
The protrusions are designed with specific local characteristics: they project radially inwardly only to a controlled extent, and are positioned at specific locations on the barrel. This localized design ensures that the protrusions contact the sleeve at predetermined points without extending far enough to penetrate the outer sheath and damage the core wire, thus achieving size reduction while preventing harm.
Solution Approach 2:
The sleeve is crimped onto the outer sheath at a predetermined position before the barrel is assembled. This preliminary action establishes a protective barrier that prevents the inward-projecting protrusions from contacting the outer sheath or core wire during subsequent assembly and use, eliminating the damage risk while maintaining the compact design.
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 configuration effectively suppresses the enlargement of the shielded cable assembly, improves the fixing force, and maintains a compact size by ensuring the protrusions contact the sleeve rather than the core wire or sheath, even with uneven braided wire thickness.
Implementation Method 1
a sleeve made of metal and crimped to an outer surface of the outer sheath
Implementation Method 2
the barrel crimped to an outer surface of the folded portion
Data Source
AI summary
A shielded cable/terminal assembly includes a shielded cable (10) with a braided wire (14) between wires (13) and an outer sheath (15). The braided wire (14) has a folded portion (18) formed by folding the braided wire (14) exposed from an end of the outer sheath (15) toward the outer sheath (15). A metal sleeve (19) is crimped to an outer surface of the outer sheath (15) inside the folded portion (18) in a radial direction of the shielded cable (10). A terminal (11) has a barrel (30) configured to sandwich the folded portion (18) between the sleeve (19) and the barrel (30), with the barrel (30) crimped to an outer surface of the folded portion (18). The barrel (30) has protrusions (32) projecting radially inward of the shielded cable (10) at positions behind a rear part of the sleeve (19) in an axial direction.